Concentration measurement of combustible gas mixture based on gas viscosity

doi:10.16265/j.cnki.issn1003-3033.2022.03.018

Abstract

Abstract:

In order to make a quantitative analysis on gas composition, response signals of pressure drop generated by gas samples were measured after they flew through a specially designed viscosity sensor. Then, according to Poiseuille's Law and theoretical model of gas mixture viscosity, quantitative analysis was conducted to obtain concentration of combustible gas, and measurement experiments were carried out for different concentration of hydrogen. The results show that concentration of gas samples can be calculated by utilizing measured pressure drop based on theoretical relationship of mixed gas viscosity, and the absolute deviation between measurement results and benchmark concentration are no more than ±1.0 %. And the relative error is no more than ±3% when volume fraction is over 15%. It has been proved by the quantitative test results that the proposed method has a high accuracy and is capable of predicting volume fraction of combustible gas accurately.

Key words: gas mixture viscosity, combustible gas concentration, measurement method, Poiseuille's Law, gas pressure drop

YANG Songcheng, WANG Jizhe, WANG Lihua, ZHANG Hongming, ZHAO Lanming. Concentration measurement of combustible gas mixture based on gas viscosity[J]. China Safety Science Journal, 2022, 32(3): 131-136.

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H₂体积分数/%	H₂-空气混合气体压差响应
H₂体积分数/%	25组测量数据平均值/Pa	相对标准偏差/%
0	1 054.2	0.31
10	1 045.8	0.29
20	1 028.1	0.22
30	1 008.4	0.29
40	980.7	0.23
50	948.0	0.28
60	904.8	0.28
70	850.7	0.30
80	775.3	0.28
90	670.8	0.36
100	510.7	0.34

气样编号	基准体积分数/%	测量压差值/Pa	测量体积分数/%	绝对偏差/%	测量相对误差/%
1号	5	1 051.0	4.61	-0.39	-7.80
2号	15	1 034.1	15.38	0.38	2.53
3号	25	1 015.3	25.38	0.38	1.52
4号	35	994.5	34.60	-0.40	-1.14
5号	45	964.9	45.25	0.25	0.56
6号	55	931.1	54.84	-0.16	-0.29
7号	65	880.4	65.77	0.77	1.18
8号	75	816.1	75.79	0.79	1.05
9号	85	722.8	85.83	0.83	0.98
10号	95	594.1	94.86	-0.14	-0.15