Gas production tests of filling slurry and its influence on CO sensor monitoring

doi:10.16265/j.cnki.issn1003-3033.2023.10.0232

Abstract

Abstract:

Aiming at the problem of false alarm of electrochemical CO sensor in coal mines due to interference gas produced by physicochemical reaction of filling slurry in goaf, based on the oxidation period, gas production characteristics, X-ray diffraction (XRD) of the composition after reaction and the cross interference of filling gas to electrochemical CO sensor in coal mines, etc., the gas production characteristics of filling grout composed of coal gangue, fly ash, Portland cement and mine water at the ratio of 65.5∶4.5∶10∶20 were studied, and the influence characteristics of filling gas on electrochemical CO sensor for mining were explored. The results show that O₂ and CO₂ are consumed, and H₂, CO and CH₄ are produced in the process of physicochemical reaction. Among them, the concentration changes of O₂ and CO is related to the oxidation of coal gangue, the concentration change of CH₄ is related to the desorption of methane in coal gangue, the reaction of CaO and CO₂ will lead to the reduction of CO₂ concentration, and the reaction of Al powder in fly ash in an alkaline environment will produce H₂, and H₂ is the main factor causing the false alarm of electrochemical CO sensor in coal mines. It also has positive cross interference to the detection results of electrochemical CO sensors used in coal mines.

Key words: filling material, gas production characteristics, electrochemical CO sensor, false alarm, interference factor

ZHOU Kun, SUN Xixian, MA Haoyue, LIU Shien, WEI Linhai, ZHONG Xiaoxing. Gas production tests of filling slurry and its influence on CO sensor monitoring[J]. China Safety Science Journal, 2023, 33(10): 176-182.

Figures/Tables 10

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成分	煤矸石	粉煤灰	水泥
SiO₂	44.41	43.81	25.47
Al₂O₃	22.13	41.66	10.19
SO₃	16.23	2.10	3.85
Fe₂O₃	8.91	3.54	3.33
CaO	3.84	4.93	51.26
K₂O	1.73	0.57	0.89
MgO	1.21	0.84	3.76
TiO₂	0.80	1.43	0.39
其他	0.74	1.12	0.86

名称	煤矸石	粉煤灰	水泥	矿井水
浆液1	√	√	—	√
浆液2	√	—	√	√
浆液3	—	√	√	√
浆液4	√	√	√	√

测量范围/ 10^-6	气体体积分数/10^-6	基本误差
测量范围/ 10^-6	气体体积分数/10^-6	绝对误差/10^-6	相对误差/%
[0,1 000]	[0,100]	±4	—
	(100,500]	—	±5
	(500,1 000]	—	±6