Measurement method of dust time-delay sampling in coal mine heading face

doi:10.16265/j.cnki.issn1003-3033.2023.10.2042

Abstract

Abstract:

In order to study the influence of different sampling time nodes on the dust transport in the long-distance alleyway measured by the filter membrane weighing method, a time-delayed sampling method was proposed in combination with the finite element analysis method. The force of dust particles in the flow field was analyzed, and the radial motion model along the roadway was obtained. According to the wind speed distribution of the roadway, the time required for dust to move in the roadway was estimated, a dust concentration measurement plan was formulated and measured in the coal mine roadway was analyzed. The results show that the migration and distribution of the same batch of dust at different times, different locations and different working conditions can be obtained by the time-delay sampling method, while the test results of the multi-point synchronous sampling method at different starting times are unstable. Dust accumulation was found in the data analysis of the time-delay sampling method, which resulted in an hourly growth rate of dust concentration in the weak wind tunnel equal to about 10%-15% of the dust concentration diffused into the area. The dust concentrations and their corresponding dust accumulation concentrations and measurement errors of the time-delayed sampling method under different working conditions are analyzed, new dust source locations are identified, and dust-producing concentrations are calculated to provide a reference basis for the targeted arrangement and installation of dust reduction equipment in the roadway.

Key words: heading face, time-delay sampling method, sampling start time, dust mass concentration, dust accumulation

LIN Hanyi, JIANG Bingyou, YUAN Liang, REN Bo, WANG Xiaohan. Measurement method of dust time-delay sampling in coal mine heading face[J]. China Safety Science Journal, 2023, 33(10): 199-206.

Figures/Tables 6

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序号	时间点	序号	时间点	序号	时间点
1	0	6	167	11	1 689
2	11	7	298	12	2 247
3	26	8	494	13	2 818
4	46	9	764	14	3 585
5	92	10	1 156	15	4 350

采样点	粉尘质量浓度/(mg·m^-3)
	测试组1 (掘进后30 s)		测试组2 (掘进后2 400 s)		测试组3 (掘进后4 800 s)
		全尘	呼尘	全尘	呼尘	全尘	呼尘
1	271.8	104.5	-0.9	+1.8	-4.4	+2.2
2	238.6	95.4	+5.1	+0.9	+1.9	-2.2
3	245.4	99.2	+4.1	+2.3	-0.8	+3.5
4	143.7	67.5	+1.1	+1.9	+2.6	+3.3
5	125.5	63.3	+4.6	+3.5	+11.0	+6.0
6	109.2	55.4	+9.2	+4.3	+16.0	+10.2
7	96.4	52.7	+8.8	+5.7	+16.4	+12.1
8	92.7	54.5	+14.2	+3.7	+22.5	+11.1
9	93.8	53	+12.6	+6.8	+19.0	+11.2
10	89.4	53.8	+10.9	+4.1	+19.3	+9.5
11	86.9	52.4	+10.6	+4.7	+15.4	+5.3
12	87.2	53.1	+11.9	+5.2	+14.4	+3.1
13	87.6	52	+10.6	+5.7	+13.1	+5.1
14	89.2	52.9	+9.5	+4.4	+14.2	+3.5
15	108.4	61.5	-15.5	-9.1	-9.0	-4.8