Study on dual-objective optimization of dust under airflow regulation in fully mechanized faces

doi:10.16265/j.cnki.issn1003-3033.2022.04.007

Abstract

Abstract:

In order to solve the problem of heavy dust accumulation in roadways caused by the failure of current ventilation mode in coal mines to dynamically regulate wind state of its air outlets according to actual needs during tunneling process, flow field simulation test method was adopted to analyze and obtain regression data of dust concentration along with changes of air flow parameters of the outlets. Secondly, with the lowest respirable dust concentration at drivers' place and optimal total dust concentration at return side as goals, a dual-objective optimization model of dust concentration under control of airflow was established. Then, it was solved based on particle group algorithm, and ideal solution was selected as optimal airflow control plan. Finally, downhole test and dust reduction effect analysis were carried out using self-developed control device. The results show that after optimal airflow regulation, total dust concentration on return side is reduced by 38.55% and 42.11% when air outlet is 5 and 10 m respectively away from end face, and respirable dust concentration at drivers' place is reduced by 26.05% and 27.29%, thus providing theoretical basis for safe and efficient ventilation and dust reduction in fully mechanized faces.

Key words: fully mechanized face, airflow control, optimization model, particle swarm algorithm, dust concentration

GONG Xiaoyan, TONG Dandan, FAN Jiangjiang, PENG Gaogao, LI Zhen, ZHAO Shaolong. Study on dual-objective optimization of dust under airflow regulation in fully mechanized faces[J]. China Safety Science Journal, 2022, 32(4): 44-50.

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计算模型	设定
求解器	稳态求解
	绝对速度
	重力加速度(-9.81 m/s²)
湍流模型	Realizable k-ε
近壁处理	标准壁面函数
离散模型	开
组分运输	开
能量方程	关

边界条件	设定
入口边界类型	定流速入口
入口速度/(m·s^-1)	7.64
入口湍流强度/%	3.08
组分质量分数/%	1
入口水力直径/m	1.0
出口边界类型	流出

离散相模型	设定
相间耦合	开
相间耦合频率	20
升力	开
喷射源类型	面喷射
粒径分布规律	罗辛-拉姆勒分布
分布指数	1.62
质量流率/(kg·s^-1)	0.003 6
离散相边界类型	底板捕捉,壁面反射

方案	d /m	α /(°)	β /(°)
1	0.7	5	0
2	0.7	5	1
3	0.7	5	3
4	0.7	5	5
5	0.7	10	0
︙	︙	︙	︙
95	1.2	20	3
96	1.2	20	5

方案	d	α	β	C_s	C_h	V_s	V_h	W
1	0.7	5	0	244	289	0.69	1.37	0.148 4
2	0.7	5	1	274	298	0.66	1.38	0.121 5
3	0.7	5	3	328	306	0.61	1.41	0.091 5
4	0.7	5	5	378	306	0.54	1.45	0.066 8
5	0.7	10	1	277	309	0.59	1.37	0.146 0
︙	︙	︙	︙	︙	︙	︙	︙	︙
48	1.2	10	5	375	472	0.36	1.37	0.541 4
49	1.2	15	0	248	421	0.56	1.26	0.628 4