Optimization of cyclone air curtain dust control under control of exhaust outlet on fully mechanized excavation face

doi:10.16265/j.cnki.issn1003-3033.2023.06.1458

Abstract

Abstract:

In order to improve the dust control technology of the coal mine heaving face, the synergistic effect of swirling air curtain and air outlet was adopted to optimize the airflow to reduce dust accumulation and improve the ventilation environment of the working face. Combining the attached wall blower and the self-developed airflow control device, the cyclone air curtain and the airflow control system of the extract air outlet under the hybrid ventilation were designed. Firstly, numerical simulation was used to study the influence law of dust transport and distribution caused by the slit width of the wall duct, shaft diameter air volume ratio and suction port diameter, and single parameter variation of deflection angle. Secondly, the particle swarm optimization(PSO) algorithm was used to obtain the optimal control scheme of dual objective optimization of dust in driver and pedestrian positions. Finally, numerical simulation and dust control test platform were built to verify the optimization effect of the optimal solution. The results showed that the dust concentration in the driver's position was reduced by 41.5%, and the average dust concentration of the pedestrian breathing belt at the return air side was reduced by 64.2%. The optimized effect of dust reduction from physical experiments and numerical simulations was in general agreement. The effectiveness of the comprehensive dust removal method of swirling air curtains and air outlets is verified.

Key words: comprehensive excavation face, exhaust outlet, airflow control, swirling wind curtain, dust field

GONG Xiaoyan, ZHANG Hao, CHEN Long, FEI Yinghao, WANG Tianshu, NIU Huming. Optimization of cyclone air curtain dust control under control of exhaust outlet on fully mechanized excavation face[J]. China Safety Science Journal, 2023, 33(6): 56-63.

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References 12

[1]	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.
[2]	陈刚, 张晓蕾, 徐帅, 等. 我国2005—2020年粉尘爆炸事故统计分析[J]. 中国安全科学学报, 2022, 32(8):76-83. doi: 10.16265/j.cnki.issn1003-3033.2022.08.0812
	CHEN Gang, ZHANG Xiaolei, XU Shuai, et al. Statistical analysis on dust explosion accidents in China from 2005 to 2020[J]. China Safety Science Journal, 2022, 32(8): 76-83. doi: 10.16265/j.cnki.issn1003-3033.2022.08.0812
[3]	LI Yongjun, WANG Pengfei, LIU Ronghua, et al. Optimization of structural parameters and installation position of the wall-mounted air cylinder in the fully mechanized excavation face based on CFD and orthogonal design[J]. Process Safety and Environmental Protection, 2019, 130: 344-358. doi: 10.1016/j.psep.2019.08.027
[4]	王昊, 程卫民, 孙彪, 等. 附壁风筒径向流量比及抽尘距离对综掘工作面隔尘风幕的影响[J]. 化工进展, 2017, 36(10):3610-3618. doi: 10.16085/j.issn.1000-6613.2017-0695
	WANG Hao, CHENG Weimin, SUN Biao, et al. The effects of wind-splitting of a wall-attached air duct and dust exhaust distance on dust barrier air curtain in a fully mechanized working face[J]. Chemical Industry and Engineering Progress, 2017, 36(10): 3610-3618. doi: 10.16085/j.issn.1000-6613.2017-0695
[5]	LIU Qiang, NIE Wen. The effects of the installation position of a multi-radial swirling air-curtain generator on dust diffusion and pollution rules in a fully-mechanized excavation face:a case study[J]. Powder Technology, 2018, 329: 371-385. doi: 10.1016/j.powtec.2018.01.064
[6]	刘荣华, 朱必勇, 王鹏飞, 等. 综掘工作面双径向旋流屏蔽通风控尘机理[J]. 煤炭学报, 2021, 46(12):3902-3911.
	LIU Ronghua, ZHU Biyong, WANG Pengfei, et al. Dust control mechanism of double radial swirl shielding ventilation in fully mechanized heading face[J]. Journal of China Coal Society, 2021, 46(12): 3902-3911.
[7]	聂文, 程卫民, 陈连军, 等. 旋流风幕扰动硬岩综掘面风-尘流场数值模拟[J]. 中国安全科学学报, 2014, 24(3):120-125.
	NIE Wen, CHENG Weimin, CHEN Lianjun, et al. Numerical simulation of swirl air curtain disturbed air-dust flowing field at hard rock fully mechanized workface[J]. China Safety Science Journal, 2014, 24(3): 120-125.
[8]	龚晓燕, 樊江江, 刘壮壮, 等. 综掘面出风口及抽风口风流综合调控下粉尘场优化分析[J]. 煤炭学报, 2021, 46(增2):800-809.
	GONG Xiaoyan, FAN Jiangjiang, LIU Zhuangzhuang, et al. Optimization analysis of dust field under comprehensive control of air outlet and exhaust air flow in fully mechanized excavation face[J]. Journal of China Coal Society: 2021, 46(S2): 800-809.
[9]	樊亦洋. 综掘面风幕抽吸控尘系统参数优化的数值模拟研究[D]. 西安: 西安科技大学, 2020.
	FAN Yiyang. Numerical simulation research on parameter optimization of air dust control system of fully mechanized face[D]. Xi'an: Xi'an University of Science and Technology, 2020.
[10]	ZHANG Qi, ZHOU Gang, QIAN Xinming, et al. Diffuse pollution characteristics of respirable dust in fully-mechanized mining face under various velocities based on CFD investigation[J] .Journal of Cleaner Production, 2018, 184: 239-250. doi: 10.1016/j.jclepro.2018.02.230
[11]	国家安全生产监督管理总局. 煤矿安全规程[M]. 北京: 煤炭工业出版社, 2022:41-60.
	State Administration of Work Safety. The coal mine safety rules[M]. Beijing: China Coal Industry Publishing House. 2022:41-60.
[12]	龚晓燕, 童丹丹, 樊江江, 等. 综掘面风流调控下粉尘双目标优化研究[J]. 中国安全科学学报, 2022, 32(4):44-50. doi: 10.16265/j.cnki.issn1003-3033.2022.04.007
	GONG Xiaoyan, TONG Dandan, FAN Jiangjiang, et al. Study on dual-objective optimization of dust under airflow regulation in fully mechanized faces[J]. China Safety Science Journal, 2022, 32(4): 44-50. doi: 10.16265/j.cnki.issn1003-3033.2022.04.007

选项		设定
压风筒	入口类型	速度入口
	入流速度/(m·s^-1)	8.49
	湍流强度/%	3.04
	水力直径/m	1
抽风筒	入口类型	速度入口
	入流速度/(m·s^-1)	-7.45
	湍流强度/%	3.09
	水力直径/m	1
巷道出口断面		自由流出

设置选项	设定
相间耦合	开启
耦合频率	20
颗粒喷射材料	煤粉
质量流率/(kg·s^-1)	0.008
粒径分布特征	罗辛-拉姆勒分布
粒径个数	10
分布指数	1.62
离散相壁面边界类型	底板吸附,其他反弹

水平	因素
水平	A/m	B	C/m	D/(°)
1	0.02	0.2	0.7	0
2	0.045	1.85	0.95	7.5
3	0.07	3.5	1.2	15

方案	影响因素				优化目标		方案	影响因素				优化目标
方案	A/m	B	C/m	D/(°)	Q₁/ (mg·m^-3)	Q₂/ (mg·m^-3)	方案	A/m	B	C/m	D/(°)	Q₁/ (mg·m^-3)	Q₂/ (mg·m^-3)
1	0.02	0.2	0.95	7.5	787.4	179.8	16	0.045	3.5	0.95	0	162.3	129.5
2	0.02	3.5	0.95	7.5	121.2	153.2	17	0.045	0.2	0.95	15	301.7	161.2
3	0.02	1.85	0.95	0	574.2	125.1	18	0.045	3.5	0.95	15	139.2	140.2
4	0.02	1.85	0.95	15	451.7	186.1	19	0.045	1.85	0.95	7.5	666.2	260.5
5	0.02	1.85	0.7	7.5	379.1	257.1	20	0.045	1.85	0.95	7.5	634.7	160.2
6	0.02	1.85	1.2	7.5	401.7	148.3	21	0.045	1.85	0.95	7.5	568.4	142.1
7	0.045	1.85	0.7	0	649.1	178.5	22	0.045	1.85	0.95	7.5	610.4	126.7
8	0.045	1.85	1.2	0	581.2	181.7	23	0.045	1.85	0.95	7.5	721.3	211.8
9	0.045	1.85	0.7	15	569.7	156.8	24	0.07	0.2	0.95	7.5	649.1	149.6
10	0.045	1.85	1.2	15	512.3	197.3	25	0.07	3.5	0.95	7.5	174.1	167.8
11	0.045	0.2	0.7	7.5	466.2	196.2	26	0.07	1.85	0.95	0	623.5	163.6
12	0.045	3.5	0.7	7.5	264.7	138.7	27	0.07	1.85	0.95	15	601.3	92.1
13	0.045	0.2	1.2	7.5	869.3	96.5	28	0.07	1.85	0.7	7.5	475.3	136.8
14	0.045	3.5	1.2	7.5	126.3	233.5	29	0.07	1.85	1.2	7.5	370.6	148.6
15	0.045	0.2	0.95	0	912.3	110.8	—

项目		司机位置粉尘质量浓度/ (mg·m^-3)	行人呼吸带平均粉尘质量浓度/(mg·m^-3)
模拟值	优化前	404.9	337.8
	优化后	230.4	124.8
	降尘效果/%	降低43.1	降低63.1
测试值	优化前	385.4	403.1
	优化后	225.3	144.0
	降尘效果/%	降低41.5	降低64.2