Table of Content

30 December 2021, Volume 31 Issue S1

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Safety social science and safety management Safety engineering technology Technology and engineering of disaster prevention and mitigation Emergency technology and management Occupational health

Safety social science and safety management

Framework development of power enterprises' accident analysis system based on failure mode

SUN Zhichun, GONG Guangzheng, ZHANG Yanliang, XIAO Haiping, BAI Ling, YAN Weidong

2021, 31(S1):  1-7.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.001

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In order to ensure safe and efficient operation of electric power enterprises, according to causation theory and basic principle of safety system process, an accident analysis system based on failure mode was established. Data of management failure points were analyzed and corresponding personnel behaviors were revealed. The results show that failure in management process is caused jointly by human, organizational and management factors. Among them, human error and management failure are the main causes of accidents, accounting for more than 40% of them, while organization management failure accounts for more than 11%, and equipment for only 6%. Traditional analysis methods are mostly staying on the surface as they focus more on individual reasons, but give little attention to those of organization and system, and they are lack of in-depth analysis on management reasons. It is necessary to determine corresponding failure mode and provide solution strategies through analysis of accident causes so as to identify and control potential safety risks.

Study on safety management strategy of outsourcing contractors

CAO Yong, LU Yunfeng, HE Yibo, LI Ming, LIU Xiaojie

2021, 31(S1):  8-13.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.002

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In order to improvesafety management mechanism of government and enterprises' outsourcing contractors, to find and solve their common existing problemsso as to implement safety management ideas smoothly, through exploratory research, experience summary and case study, existing problems facing these contractors weresummarized and analyzed, and corresponding solutionswere put forward.The results show that with reasons for accidentsas a breakthrough, it is found that there are problems like inadequate regulatory innovation incontractor safety management, lack of strict access,and unreasonable biddingexisting in contractors' safety management, and countermeasures, including unified regulatory standards, strict personnel access, improvement in personnel quality, can be strong reference fortheir safety management.

Research on methods to establish and improve responsibility system of work safety in enterprises

ZHANG Guancun

2021, 31(S1):  14-18.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.003

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In order to help some enterprises fulfil principal responsibility of work safety in a better way, existing problems in the establishment of work safety responsibility system were analyzed, mainly including unclear definition of department responsibilities and position responsibilities, deficient management system and content of work safety, and others. Then, key methods to accurately define responsibilities of departments and positions as well as instructions of how to use form tools to assist in preparation of these parts were put forward. On this basis, methods to improve work safety management system, to supplement and improve relevant department and position responsibilities at all levels were further explained. The results show that the above mentioned measures can help enterprises to establish and improve work safety responsibility system in a more accurate and standard manner, thus providing institutional guarantee for the full implementation of main responsibility in work safety.

Research on safety management of coal preparation plants based on artificial intelligence video analysis

ZHAO Liang, SUN Kuiyuan, HAN Baohu, AN Wenli, LI Guoqiang

2021, 31(S1):  19-23.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.004

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In order to improve intelligent safety monitoring in coal preparation plants, and to reduce manpower consumption, an AI video analysis system for safety management was developed by using deep neural network. Firstly, deep neural network algorithm was designed to detect and analyze video targets in typical scenes in real time, and a monitoring and early warning management system was established. Then, video security early warning mechanism for human, machines, and environment was developed for video analysis of workers' unsafe behaviors at the plants, video identification of unsafe conditions of objects, and video judgments of environmental hazards. The results show that the system can realize timely warning to eliminate potential safety hazards through acquisition, processing and feedback of human, machine, and environmental information, and improve safety factor of operation process.

Employee caring center's role in preventing railway conductors' depression

KANG Long, ZHANG Bin, ZHANG Zhaohui

2021, 31(S1):  24-28.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.005

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In order to reduce railway conductors' risks of depression, and comprehensively improve their pressure resistance ability, cognitive behavior and emotional stability in the face of heavy tasks, an employee caring center was established by the rolling stock branch of Shuohuang Railway Group by using EAP, and a safety behavior control system for the conductors was developed. Then, a randomized comparison test was carried out, and 160 employees' data were collected and analyzed. The results show that employee caring center significantly improves the emotional stability and pressure resistance ability of the conductors, and effectively complements the blank of human psychological factors intervention and regulation in transportation production risk pre-control system.


Discussion on status quo of coal washing and its work safety management

SHI Jianguang

2021, 31(S1):  29-33.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.006

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In order to promote development of coal washing and processing industry and ensure safety during coal washing, the current situation of the industry was analyzed from the status quo of coal washing, coal washing equipment and the washing technology in China. Then, factors and causes for accidents were analyzed, and concrete measures to strengthen safety education of workers and an implementation plan of work safety management were put forward. Finally, the development trend of coal washing was discussed, and some suggestions on its development in China were proposed. The results show that the proportion of coal washing in China is increasing, coal preparation equipment is developing, and washing process is becoming more environmentally friendly. In the process of coal washing, it is necessary to strengthen work safety management, set up safety concept for workers, improve their safety skills and strengthen investigation on and rectification of safety risks, to promote intrinsic safety management and build safety culture in enterprises. More importantly, constant efforts should be made to develop new technologies and processes so as to achieve modernization and intelligent development of the industry, ensuring low cost operation of coal preparation plants while strengthening work safety management.

Exploration and practice of safety management system for modern coal-to-liquid chemical industry

QIAO Yuan, WANG Jianli

2021, 31(S1):  34-38.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.007

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In order to address the high safety risks in production and operation process of modern coal-to-liquid, coal-to-olefin and coal-to-gas chemical enterprises, based on their characteristics of high concentration of high temperature, high pressure, flammable, explosive, toxic and harmful media, typical safety management problems of coal-to-liquid enterprises were explored and practiced. Unsafe states of objects and unsafe behaviors of human were comprehensively managed by adopting risk pre-control and process safety management, and a set of safety management system suitable for modern coal-to-liquid chemical industry was developed. The results show that the system has practical and popularization value as it can improve safety management of these companies, and help to realize safe, stable and long-term operation of devices.

Work safety standardization construction of coal mine production auxiliary units

HONG Haifeng, WANG Xianghai, WANG Sifang

2021, 31(S1):  39-42.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.008

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In order to further implement the requirement of standardization construction, it was introduced into the coal mine auxiliary production units, and a standard work safety management system, covering all auxiliary units, was developed, including eight primary elements and 10 secondary elements, among which quality control played as the core content with a weight of 50%. Then, specific job requirements were described according to survey analysis results, three-level elements were formed, for each of which different scores were given, and scoring method was clarified. The results show that the standard work safety system in auxiliary units can provide important support for personnel at all levels to participate in wrok safety management, and operators can perform in accordance with the set terms to meet relevant requirements, achieving standard works for given position. Grass-roots management team can inspect works following the terms of inspection, while company and department managers assess others according to relevant provisions. Managers at all levels are permitted to participate in standardization construction, and to put forward their ideas to achieve the principal of total involvement in safety management.

Research on safety control of unmanned trucks in open-pit mines

LIU Xiaojie, CAO Shengwu, LUO Huaiting, ZHANG Baowei

2021, 31(S1):  43-48.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.009

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In order to solve the typical personnel management problems existing in production process of open-pit mines in China at the present stage, such as weak personnel safety awareness, aging driver team and illegal operation, based on current research status of 5g + and intelligent mining at home and abroad, the key link of intelligent mine construction - safety control of unmanned trucks was thoroughly analyzed from the perspective of safety by consulting relevant literature. Then, problems and control measures in site planning, key link management and control, maintenance and transformation, road driving and joint operation in the initial mixed operation stagewere proposed, and some suggestions on relevant science and security technology and 5G network base station constructionwere also put forward. The results show that by improving safety management, technical control and safety protection, the safety of open-pit mines can be comprehensively improvedin the mixed operation stage, and smooth and safe advancement of unmanned technology can be safely advanced, which are helpful to essentially solve old and difficult problems caused by human factors in the field of open-pit mines.

Instance-based research on construction license management for coal chemical projects

JIANG Haifu

2021, 31(S1):  49-55.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.010

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In order to optimize and improve management of construction license for coal chemical projects and to prevent accidents, with operation permit management of coal gasification units of National Energy Group Shenhua Yulin Coal Comprehensive Economic Utilization Project (first-stage project) as an example, operation risks were analyzed and types of licenses were determined according to drawings and construction organization design, and operation permits in construction process were counted. Then, based on classified statistics of safety inspection records during construction period, problems in permit management process were discovered, and their number, type, and probability were compared before differences in operation permit management capacity between the units were obtained, and contractor list was optimized through the contractor evaluation system. The results show that fire operation, high place working, and lifting operation are the key management points in the whole process of project construction. By adopting methods, such as optimizing the list of qualified contractors, strengthening control on key licenses with large workloads, and implementing corresponding management measures based on characteristics of the contractors, etc., safety management of construction sites can be improved.

Shackles of railway construction safety management and their countermeasures

WANG Zhizhong

2021, 31(S1):  56-61.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.011

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In order to ensure the quality and overall effectiveness of railway construction, existing problems of its safety management were analyzed before countermeasures were explored so as to strengthen the management accordingly. The results show that for the safety management of railway construction, there is a lack of good safety awareness and proper construction preparations as well as a solid safety management system, and construction organizations fail to properly assume safety responsibilities, prepare complete safety technology or labor protection plans. These can be handled by countermeasures like enhancing safety awareness, making good construction preparations, perfecting safety management system, actively assuming safety responsibilities by construction organizations, and systematically preparing and improving safety technology and labor protection measures plan.

Safety management method of chemical laboratories

LI Qian

2021, 31(S1):  62-67.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.012

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In order to prevent safety accidents in scientific research and experiments, methods of improving safety management of scientific research and chemical laboratories were studied by utilizing BBS. Causes of chemical laboratory accidents in recent 5 years were analyzed, and difficulty and key points of safety management in research institutes were summarized based on existing management problems. Then, according to BBS, methods and effective measures to improve laboratory safety management were put forward from two levels, namely organizational behavior and personal behavior. The results show that by improving safety management of laboratories and safety awareness of scientific researchers from the two proposed levels, laboratory accidents can be effectively avoided and reduced.


Research on safety risk pre-control management system and ISRS

WANG Huijun, AN Liang, GAO Yulong, TIAN Yong, HAO Mengzhong, BAI Aimin

2021, 31(S1):  68-72.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.013

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The integration of ISRS management elements into the safety risk pre-control management system is an important initiative in order to identify and remedy loopholes in the existing safety management system and prevent production accidents in chemical companies, thus improving the safety management level of these companies in the National Energy Group. The excellent practices of ISRS were fully absorbed, and effectiveness of integrated system was evaluated to make the existing management system better. The results show that integrating some management elements of ISRS into the existing risk pre-control system improves completeness of the latter. The elements become more closely linked and their synergy can be used to enhance the performance of risk pre-control in a better way.

Analysis on accident cause model and countermeasure for large coal enterprises

YANG Xiaopeng, YAN Ruibing, PENG Lili

2021, 31(S1):  73-79.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.014

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In order to study accident prevention mechanism of large coal enterprises, accidents that occurred during the 13th five-year plan period in these companies were statistically and comparatively analyzed, and the institutional and mechanism causes were discussed. Then, a multi-element hazard analysis model suitable for accident analysis in such enterprises was established, and a system of prevention countermeasures was put forward.The results show that establishing accident cause model to analyze the causes and implementing stricter entry requirements can facilitate transformation of open-air coal mining and development of intelligent mines. Enterprises should increase safety investment and strengthen safety management, shape employees' safety behavior and achieve effective supervision of the government and market. Moreover, they should also develop a regional emergency rescue system and a countermeasure system for accident prevention in large enterprises, thus improving their safety management ability and performance.

Mutual application of risk assessment and hidden danger investigation in railway enterprises

WANG Peng

2021, 31(S1):  80-85.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.015

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In order to explore mode for mutual application of hidden danger detection and risk assessment results, by studying the knowledge of hidden danger detection and risk assessment, the result application mechanism development of the two was discussed based on theoretical research. Then, risk assessment results were applied to the establishment of hidden danger check list, and results of the latter was applied to risk assessment process. Finally, case study on a railway company's monthly safety management and control was carried out to verify the mechanism. The results show that with hidden danger check results as evaluation data, evaluation conclusion can be closely combined with scope of potential hazards investigation, providing guidance for the investigation, thus improving its efficiency. Moreover, risk assessment can be more objective and consistent with actual situation of production safety by using ratio of different types of hidden danger problems rather than expert scoring.

Safety risk assessment of open-pit mines based on quantitative theory

YIN Yixiong

2021, 31(S1):  86-91.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.016

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In order to improve safety management of open-pit coal mines, with Heishan mine as an example, comprehensive evaluation indicators were developed with 17 sub projects and 52 sub categories from four aspects of personnel factors and management system, slope management and prevention, stope safety management and transportation safety management. Then, index weighting was optimized by adopting quantitative theory, and safety risk assessment of the mine was carried out by using comprehensive index method. The results show that risk status of open-pit mines is influenced by a combination of multiple indicators. In general, the higher the hazard index is, the higher risk level it will have. And there is room for further improvement in its management system in terms of personnel turnover and technical measures for safe operation. Meanwhile, indicators such as specification of blasting operations, prevention and control measures, and traffic conditions are sensitive, and should be taken as focus in management during subsequent production.

Exploration and practice of safety culture building in hydropower enterprises

CAO Zhijin

2021, 31(S1):  92-95.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.017

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In order to improve safety management in hydropower enterprises, a safety culture building method integrating traditional management and information application management was proposed. Firstly, in view of common problems like wrong interval, misoperation and violation of regulations in these enterprises, safety culture building was explored from three aspects, namely safety responsibility culture, safety behavior culture and safety material culture. Then, with Pubugou Hydropower Plant of China Energy Dadu River as an example, specific building methods were discussed. Finally, a long-term mechanism was constructed by developing intelligent security products, improving hierarchical management and control system, building safety information system and other culture led management ideas. The research shows that by integrating key elements of safety culture into information application management, enterprises can achieve the transformation from safety system management to safety culture management, therefore improving their essential safety level.

Study on construction scheme of intelligent safety management and control system for hydropower projects

WANG Junsong, DUAN Bin, WU Wanbo, CHEN Linfeng, HE Ruoyang, DAI Ziyong

2021, 31(S1):  96-102.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.018

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In order to achieve integrated, intelligent, visualized and refined administration of safety management business information, and to improve intelligent safety management and control level, based on the theory of the smart management and control system and characteristics of hydropower engineering, an improved system was established featuring automatic perception, analysis and early warning, and interactive decision-making through integrating safety management with cutting-edge technologies such as mobile Internet, Internet of Things, cloud platforms, big data, and artificial intelligence. Then, information of dispersed business concerning safety management of hydropower projects was integrated, and with construction and application of Jinchuan Hydropower Station on the Dadu River as an example, the results show that the proposed system can realize comprehensive identification, perception, early warning and closed-loop rectification of construction risks, providing an intelligent and innovative model for safety management of hydropower project construction.

Safety engineering technology

Fault-handling strategies and methods large-scale thermal power units

WEN Xinyu, ZHANG Jian

2021, 31(S1):  103-108.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.019

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In order to improve correctness and accuracy of fault handling during production process of large-scale thermal power units, the trend, law and characteristics of faults in the process were revealed, key points, and inducing factors and critical points of fault trend were quantitatively analyzed. Then, "tree structure" fault response strategy was put forward, and corresponding methods for different fault sources and classifications were proposed and described in detail. Meanwhile, precautions for fault handling during power generation were summarized. The results show that the "tree structure" strategy and methods can improve operational personnel's fault handling efficiency. And by taking relevant methods in terms of fault source type, equipment type, unit status, etc. can provide help for handling faults of large thermal power units, and reduce human errors.

Application of CIR in wireless network safety monitoring

WANG Yuanbo

2021, 31(S1):  109-113.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.020

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In order to address the problems facing current network monitoring, including low automation, lack of monitoring samples and inability to directly monitor operating equipment, a CIR-based wireless network monitoring method was proposed, which collected data of equipment identification, location information and wireless indicators in real time without affecting performance of existing equipment. Then, a comprehensive intelligent analysis platform was constructed to intelligently analyze monitoring data from two dimensions of network and equipment by using encapsulation and geographic information visualization technology. The results show that the proposed method realizes on-line monitoring of 100 pairs of train operation equipment in the whole line, and shortens the cycle of network monitoring and analysis from one month to one day. Adopting advanced technologies like data encapsulation to simplify process and computing load of big data analysis and replace traditional manual analysis can comprehensively improve quality of network monitoring and provide support for safe operation of Shuohuang railway.

Optimization of steep-end slope mining plan in open-pit coal mines based on Vissim simulation

LIU Lijie, LIU Zhichao, NIE Zhongye

2021, 31(S1):  114-120.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.021

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In order to improve economic effectiveness of open-pit coal mines and optimize width of steep-end slope mining roads, based on current situation map of Harwusu open-pit mines, steep-end slope mining plan was proposed and slope stability simulation analysis was carried out. Then, On the premise that slope of the plan was stable, the slope grade was set according to actual road parameters at the site, and Vissim software was used to simulate traffic density and average speed of the slope behind the steep end to verify the proposed plan before its economic benefits were analyzed. The results show that the proposed plan can not only ensure slope safety, but also reduce the traffic density by 11.02 vehicles/km, while increase average speed of vehicles by 10.2 km/h. It achieves slope mining while ensures transportation efficiency, and its annual economic benefit reaches as high as 153.8 million yuan.

Operation risk analysis and emergency control strategy for unmanned hydropower stations

XIANG Wenping, LIU He, WANG He, ZHANG Li, TANG Qiao, LIU Xiaobing

2021, 31(S1):  121-128.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.022

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In order to improve work safety ability of unmanned hydropower stations, preventive measures and emergency response strategies in the face of abnormal states were studied from the perspective of operation risk. Firstly, nine kinds of operation risks under extreme conditions and unattended conditions were identified and analyzed according to production characteristics of the stations. Secondly, based on their operation management mode, corresponding risk prevention measures were proposed to ensure the safety of "dam-plant-equipment-person". Finally, with three defense lines of "system autonomy, remote assistance and on-site command" as the core, emergency response process was designed and risk classification control mechanism was established before they were verified through a case study on Shenxigou unmanned hydropower station. The results show that to analyze risks and design preventive and response measures based on characteristics of hydropower production and management mode are very helpful in improving standardization level of risk prevention and control for unmanned hydropower stations considering systematic risks caused by extreme factors.

Mental health risks and unsafe behaviors of coal mine workers: a quantitative study based on cultural circle theory

GUO Tao, WANG Xiangyao, QIU Siran

2021, 31(S1):  129-135.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.023

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In order to study psychological motivation behind coal mine workers' unsafe behaviors in production, based on quantitative survey method and cultural circle theory, quantitative analysis was conducted on how different levels of cultural circles protected miners from insomnia, depression, anxiety, neuroticism and other mental risks, and relationship between such psychological risks and unsafe production behaviors, including illegal operation and improper use of protective equipment, was studied. The results show that the two are significantly related. Employees suffering from insomnia, anxiety and depression have more unsafe behaviors and greater work safety risks. Moreover, family support and organizational culture have a positive impact on improving their sleep quality and relieving depression and anxiety. Practicing people-oriented caring management concept is helpful for work safety in enterprises.

Study on influence of methane's volume fraction and roadway structure on methane explosion characteristics

MENG Xianhua, XIE Yansen

2021, 31(S1):  136-142.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.024

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In order to clarify influence of methane's volume fraction and roadway structure on methane-air explosion characteristics, three kinds of tunnel models with different structures were established by using Fluent software. Then, numerical calculations of explosion process in roadway were carried out for methane at volume fraction of 6%, 9.5%, and 13%, and change laws of explosion pressure and temperature and propagation characteristics of flame were analyzed. The results show that when the volume fraction is 9.5%, peak pressure of shock wave and explosion temperature are the highest in straight roadway. With the increase of test distance, the peak pressure decreases continuously in conformity to exponential attenuation law. The difference in pressure peaks after methane explosion for different roadway structures mainly appears at the bend, ranking as 90°roadway > straight roadway > bifurcation roadway. Peak pressure is significantly reduced after passing through bend in bifurcated roadway, which has a significant hindering effect on shock wave. In addition, when it enters the bend and propagates along walls, it will be affected by compression wave, sparse wave and reflected wave, and flame propagation characteristics along walls will change.

Study on early warning of instantaneous excessive flow of coal blending operation in ports

ZHANG Yanjun, YANG Jianwei

2021, 31(S1):  143-148.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.025

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In order to achieve clean production in the whole process of coal transportation during loading operation in ports, especially two single unit coal blending operation, and to avoid coal spillage and material blockage to the greatest extent while effectively monitoring single unit flow, characteristics of coal blending operation and software and hardware equipment for blending in Huanghua port were fully analyzed. Then, with these characteristics as an example, coal blending process protection program was compiled and early warning system of instantaneous excessive flow in the port was constructed by adopting FactoryTalk control system platform. The results show that the system can fully cover coal blending and loading operation process in Huanghua port, and can realize early warning and control of instantaneous excessive flow for each single machine. The total instantaneous flow quantity of coal blending is basically controlled within the safety performance range of rated capacity of belt conveyors, and phenomenon of coal spillage and material blockage is significantly reduced. Cal blending flow of single machine can be monitored in real time to reduce occurrence rate of heavy load shutdown accidents.

Application of internet of vehicles technology in reform of driving safety management in hydropower enterprises

ZHANG Hongtao, LI Guanghua, XIE Fengxiang, HAN Mingliang

2021, 31(S1):  149-153.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.026

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In order to avoid traffic accidents, risk factors of traffic safety were studied by using internet of vehicles and big data technology as well as artificial intelligence algorithm model. Then, through a case study on the intelligent management and control system of Guoneng Daduhe company's internet of vehicles, traffic safety risk identification and response measures were discussed based on years of vehicle management experience in hydropower enterprises so as to prevent and control various traffic risks. The results show that the application of vehicle network technology in driving risk management and control of such enterprises can effectively pre-warn and prevent various potential risks concerning vehicles, road environment and drivers, enhance the coverage of vehicle management process, and improve the predictability of driving safety and supervision.

Theory and practice of air flow direction prediction after tunnel penetration

CHU Xinlong, CAO Zhigang, ZHAO Kai

2021, 31(S1):  154-158.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.027

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In order to prevent gas accidents after tunnels in coal mines were penetrated, influence of tunnels on air flow direction was studied by utilizing energy conservation law and energy equation theory. Then, based on variance characteristics of static air pressure, velocity pressure and potential pressure in flow process, an equation for total energy of air flowing through any roadway section in process of ventilation was established by using fluid energy balance equation, and air flow direction predication theory after roadway penetration was developed before two methods for measuring wind pressure energy under different piercing conditions were given. Finally, with Tunbao coal mine as an example, verification and analysis were conducted. The results show that the prediction theory constructed in this paper can accurately determine air flow direction after roadway penetration in coal mines, thus reducing gas accidents and improving mine ventilation management.

Application of wireless safety monitoring system in gas monitoring of coal preparation plants

HAN Zibin, WANG Lihong

2021, 31(S1):  159-164.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.028

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In order to reduce or avoid gas explosion accidents in coal preparation plants and solve the problems of low intelligence of its safety monitoring system and inability to accurately determine mass volume concentration of gas, WSN was introduced, framework of the monitoring system and its functional units were designed, and its application performance was analyzed and verified. Then, application value of WSN in intelligent safety monitoring of such plants was analyzed. During the systems operation, information could be collected based on a large number of sensor nodes and sent to control center through communication network. The results show that WSN can realize real-time monitoring of gas concentration in coal preparation plants and provide early warning on site when it reaches certain value, which could ensure efficient response after alarm, so as to provide support for gas monitoring and avoid serious accidents. The low-power clustering and hierarchical routing protocol can prolong effective life cycle of the network and balance energy loss of each node.

Safety risk analysis and practice of equipment's cooperative operation in railway joint sections

CHEN Qiang

2021, 31(S1):  165-169.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.029

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In order to improve safety management of equipment's cooperative operation in railway joint sections, and to prevent equipment failures and accidents, with certain station area as an example, current situation of equipment management was summarized, and risk factors of cooperative operation were analyzed from aspects of human, machine, environment and management. Then, case study was conducted on the most common industrial and electrical cooperative operation for practical verification, and a series of measures such as setting up a joint operation group were carried out to improve safety management of such cooperation. The results show that strengthening safety management in cooperative operation can effectively reduce equipment failures, so as to achieve the purpose of accident prevention.


Vulnerability evaluation of wind farm operation based on multi-level extensible method

WU Shengsheng, WANG Xiangyao

2021, 31(S1):  170-175.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.030

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In order to improve safety management of wind power generation enterprises, safety evaluation of wind farm operation was studied by using multi-level extensible method and derived reference of vulnerability concept. A vulnerability evaluation index system was constructed through questionnaire and expert consulting method. Then, with multi-level extension method as the core, an assessment model of wind farm operation was established. Finally, a mature wind farm in China was used as an example to determine its risk level, and relevant countermeasures to prevent the farms' vulnerability were proposed in response to evaluation results, which was a new method for safety evaluation of wind farms in China. From the theoretical analysis and case calculation results, it is found that the proposed method can enhance safety evaluation of wind farm operation, and provide reference for further research on safety evaluation of the enterprises in China.


Research on safety guarantee system of heavy-haul railway operation

YANG Yimin, XIAO Bin

2021, 31(S1):  176-180.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.031

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In order to prevent personal accidents in railway operation and ensure employees'safety in inspection and repair works, a safety guarantee system was established. Firstly, Beidou navigation system and intelligent monitoring system were used to collect location information of operators' unsafe behaviors in real time. Then, the information was analyzed and monitored through network and system, and standardized operation procedure was checked before unsafe behaviors were analyzed and early warning feedback was delivered. At the same time, video monitoring room was connected by the system automatically to give an alarm when the train reached a certain distance and operator protection was not in effect. The results show that the safety guarantee system can effectively reduce labor intensity of protectors, and overcome protection obstacles caused by geographical factors, meteorological conditions, protection awareness and physical conditions, thus effectively reducing personal injury accidents and protection expenses.

Technology and engineering of disaster prevention and mitigation

Assessment and application of geological disaster risk in offshore wind farms

LI Cunyi, ZHU Zhicheng, GUO Zhanheng, HAN Yiping, GONG Wei

2021, 31(S1):  181-186.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.032

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In order to address the imperfection of existing technical methods and specifications for geological disaster risk assessment and their insufficiency in meeting requirements for construction of offshore wind farm projects, relevant studies were conducted with risk assessment of the first offshore wind farm in the southeast coast of China as an engineering example. Firstly, special marine geological environment conditions and characteristics of the project were analyzed. Then, geological hazard assessment, prediction assessment and comprehensive assessment were carried out. Finally, specific prevention and control measures were proposed. The results show that the geological hazard grade of the engineering site is small to medium, and comprehensive assessment grade is suitable for construction of offshore wind farms. However, reliable measures should be taken for problems of seabed erosion and deposition, soft soil, liquefied soil and solitary rock in the site.


Emergency technology and management

Research on railway emergency command communication system based on high-throughput satellite

DU Yu, ZHONG Hao, LI Mingchun

2021, 31(S1):  187-191.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.033

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In order to solve the problem of ″no network, no road, no electricity″ in emergency command of railway accidents, the needs and goals of China's railway emergency communication were analyzed, and an emergency command network of public-private communications was built. Then, large-bandwidth satellite was accessed through China's first high-throughput satellite ″Zhongxing 16#″, and wireless broadband coverage in emergency sites was achieved by adopting LTE wireless broadband technology. Finally, a multimedia emergency command system was developed based on mission critical (MC) technology, and network side and terminal side were encrypted by security encryption technology so as to provide a safe and reliable communication mechanism. The results show that the established public-private emergency communication network can deliver basic services such as voice and short data, and support on-site high-definition video, high-speed data transmission and other functions. Its enhanced perception of accident progress and information sharing capability can assist emergency commander at all levels in accident analysis and decision-making.

Occupational health

Influence of employees' health on work safety and accident prevention

YUE Pengchao, ZHAO Wei

2021, 31(S1):  192-196.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.034

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In order to actively solve impacts of health problems and accidents caused by various factors on social stability, enterprises' work safety and operation management, to improve employees' health management and effectively ensure smooth operation of enterprises' safe production, firstly, general manifestations of employees' health problems were classified, summarized and analyzed. Secondly, deep-seated reasons affecting their health and that may cause accidents were analyzed from five aspects of social environment, working environment, family contradictions, interpersonal relations and their own personality flaws based on typical cases. Finally, effective ways and methods to strengthen employees' health management were put forward. The results show that enhancing employees' sense of belonging to enterprises and stimulating their enthusiasm for work can effectively reduce all kinds of accidents caused by physical diseases and psychological problems, ensuring safety and health of employees as well as safe and stable operation of enterprises.

Analysis on occupational hazards in large hydropower stations and their control measures

CHEN Yang, TAN Limin, HUA Wei, LIU Lu

2021, 31(S1):  197-201.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.035

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In order to reduce occupational hazards generated during operation of large hydropower stations, on-site measured data for many years were compared with results of occupational health tests, and with two large hydropower stations under the CHN Energy group Dadu River General Hydropower Development Co., Ltd. as examples, their data of occupational hazards and occupational health examination results of operators exposed to such hazards were collected. Then, risk degree of the hazards and their main ways were comprehensively analyzed before control measures and suggestions for hydropower industry were put forward. The results show that the main occupational hazard factors are noise and power frequency electric field. With measures like optimizing working time, wearing suitable protective articles and reasonably arranging equipment in the design stage being taken, occupational hazard factors on the site can be reduced, thus reducing harm to human body.

Role of cortisol in regulating work safety behaviors of railway operators

MENG Ting, LU Yiqiong, LI Zhen, LI Xingyu

2021, 31(S1):  202-206.  doi:10.16265/j.cnki.issn 1003-3033.2021.S1.036

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In order to ensure safety of railway transportation, with train operators as research objects, relationship among their work stress, salivary cortisol (also known as stress hormone), stability of work performance, and positive and negative emotions was analyzed. Firstly, through literature review, a hypothesis was put forward that cortisol could feel changes of emotions and cognitive ability, both of which had potential of influencing operators' stability of work performance. Then, valid questionnaires of 68 objects, their samples of' saliva cortisol and work performance over the next 6 months were collected. The results show that the more stress they feel, the higher level of saliva cortisol they will have together with worse cognitive ability and more negative emotions, and moreover, their performance for the following 6 months will be more unstable. Saliva cortisol is highly correlated with operators' safety behaviors, and improving their pressure resistance ability will lay a solid foundation for safe production of enterprises.