Numerical simulation and experimental study on vortex blowing and suction dedusting technology during coal falling

doi:10.16265/j.cnki.issn 1003-3033.2021.06.016

Abstract

Abstract: In order to control dust in the process of coal falling, based on generation mechanism of vortex and migration feature of dust particles in vortex airflow field, a vortex blowing-suction dust removal technology was put forward to control dust dispersion during coal falling. Then, with a coal falling tower as an example, numerical simulation was used to analyze variance law of airflow field. Finally, a simulation experiment model was built, optimal vortex performance of devices was studied, and dust removal performance of proposed technology was compared with that of single suction one. The results show that vortex airflow is formed during coal falling process, and most of dust particles are collected by vortex, migrating bottom-up in a spiral pattern. Vortex performance will be the best at an optimal blowing ratio of 4.814. And dust removal performance of vortex blowing-suction dedusting technology is better than that of single one, with dust collection concentration per unit time being 314.27 and 191.94mg/m³, dust removal efficiency of 93.25% and 41.19%, and escape rate of 6.31% and 46.60% respectively.

Key words: coal falling process, vortex blowing and suction dedusting, coal-falling tower, numerical simulation, dust removal technology

CLC Number:

X964

JING Deji, JIA Xin, ZHANG Tian, MENG Xiangxi, MA Mingxing, WANG Zhiheng. Numerical simulation and experimental study on vortex blowing and suction dedusting technology during coal falling[J]. China Safety Science Journal, 2021, 31(6): 121-127.

References

[1] 陈景序, 荆德吉, 葛少成. 气动涡旋雾幕性能影响因素试验及优化研究[J].中国安全科学学报, 2019, 29(7): 123-128.
CHEN Jingxu, JING Deji, GE Shaocheng. Experimental study on factors influencing performance of pneumatic vortex spray curtain and its optimization [J]. China Safety Science Journal,2019,29(7): 123-128.
[2] 葛少成, 孙丽英, 荆德吉,等.水雾荷电脱除PM_2.5影响因素试验研究[J].中国安全科学学报,2019,29(3): 139-144.
GE Shaocheng, SUN Liying, JING Deji, et al. Experimental study on influencing factors of water mist charge removal of PM_2.5 [J]. China Safety Science Journal, 2019, 29(3): 139-144.
[3] 袁亮. 煤矿粉尘防控与职业安全健康科学构想[J].煤炭学报, 2020, 45(1): 1-7.
YUAN Liang. Scientific conception of coal mine dust control and occupational safety [J]. Journal of China Coal Society,2020,45(1): 1-7.
[4] 程卫民, 周刚, 陈连军,等. 我国煤矿粉尘防治理论与技术20年研究进展及展望[J].煤炭科学技术, 2020, 48(2): 1-20.
CHENG Weimin, ZHOU Gang, CHEN Lianjun, et al. Research progress and prospect of dust control theory and technology in China' s coal mines in the past 20 years [J].Coal Science and Technology, 2020, 48(2): 1-20.
[5] 陈芳. 综放工作面产尘分布规律及综合治理技术[J].煤炭工程, 2020, 52(3): 76-81.
CHEN Fang. Dust distribution law and comprehensive dust control in fully mechanized top coal caving face [J]. Coal Engineering, 2020, 52(3): 76-81.
[6] 黄宜生,胡胜勇,邵和,等.综掘工作面分级除尘系统及其应用[J].中国安全科学学报,2019,29(9): 150-154.
HUANG Yisheng, HU Shengyong, SHAO He, et al.Research and application of grading dust suppression system on comprehensive heading faces [J]. China Safety Science Journal, 2019,29 (9): 150-154.
[7] 邹常富, 张富兴. 皮带转载点产尘治理技术研究及应用[J].现代矿业, 2019, 35(6):219-221,224.
ZOU Changfu, ZHANG Fuxing. Study and Application of the dust treatment technique in belt transfer point [J].Modern Mining, 2019, 35(6):219-221,224.
[8] MA Qingxin, NIE Wen, YANG Shibo, et al. Effect of spraying on coal dust diffusion in a coal mine based on a numerical simulation[J].Environmental Pollution,2020,264:DOI:10.1016/j.envpol.2020.114717.
[9] WANG Hetang, WU Jinlong, DU Yunhe, et al. Investigation on the atomization characteristics of a solid cone spray for dust reduction at low and medium pressures[J].Advanced Powder Technology, 2019, 30(5): 903-910.
[10] 林爱晖, 李永存. 利用人造龙卷风控制有害物扩散的研究[J].中国安全科学学报, 2014, 24(1): 126-130.
LIN Aihui, LI Yongcun. Investigation on controlling diffusion of noxious substance using artificial tornado [J]. China Safety Science Journal, 2014, 24(1): 126-130.
[11] ARAVIND G P, DEEPU M. Numerical studies on convective mass transfer augmentation in high speed flows with lateral sweep vortex generator and dimple cavity[J]. International Journal of Thermal Sciences, 2020, 153: DOI:10.1016/j.ijthermalsci.2020.106379.
[12] MENNI Y, CHAMKHA A J, AZZI A, et al. Numerical analysis of fluid flow and heat transfer characteristics of a new ind of vortex generators by comparison with those of traditional vortex generators[J].International Journal of Fluid Mechanics Research,2020,47(1): 23-42.
[13] 丛晓春, 张光玉, 詹水芬.露天煤尘污染扩散运动的数值计算[J].煤炭学报, 2007, 32(11): 1 138-1 141.
CONG Xiaochun, ZHANG Guangyu, ZHAN Shuifen. Numerical calculation of mine powder diffusion movement [J]. Journal of China Coal Society, 2007,32(11): 1 138-1 141.
[14] 荆德吉, 徐放, 葛少成,等. 多层螺旋雾幕技术的喷雾模拟及降尘试验研究[J].中国安全生产科学技术,2019,15(8): 70-76.
JING Deji, XU Fang,GE Shaocheng, et al. Study on spray simulation and dust removal experiments of multi-layer spiral fog curtain technology [J].Journal of Safety Science and Technology, 2019, 15(8): 70-76.
[15] 关文玲, 王晓娟, 董呈杰,等. 无上部抽吸装置储罐区人工龙卷风风场模拟[J].安全与环境学报, 2020, 20(1): 98-105.
GUAN Wenling, WANG Xiaojuan, DONG Chengjie, et al. Numerical simulation for the artificial tornado field in a storage tank area with no suction device [J]. Journal of Safety and Environment, 2020, 20(1): 98-105.
[16] 杨胜来.综采工作面粉尘运移和粉尘浓度三维分布的数值模拟研究[J].中国安全科学学报,2001,11(4): 64-67.
YANG Shenglai. Numerical simulation of 3-Dimensional sust sistribution on long wall coal faces [J]. China Safety Science Journal, 2001,11 (4): 64-67.
[17] 王宝晴,张超,刘建.不同风速下巷道断面微细粉尘分布模拟试验研究[J].中国安全科学学报,2018,28(3): 44-49.
WANG Baoqing, ZHANG Chao, LIU Jian. Simulation experimental study on fine dust distribution over roadway section under different wind speeds [J]. China Safety Science Journal, 2018,28 (3): 44-49.
[18] 张小良,叶圣军,刘晓晨,等.水平管道弱激波扬起沉积粉尘运动特征研究[J].中国安全科学学报,2019,29(1): 55-61.
ZHANG Xiaoliang, YE Shengjun, LIU Xiaochen, et al. Study on movement characteristics of dust raised by weak shock wave in horizontal pipeline [J]. China Safety Science Journal, 2019,29 (1): 55-61.