Accurate Concentration Measurement Model of Multicomponent Mixed Gases during a Mine Disaster Period

Abstract

A variety of gaseous products are formed when mine fires and coal and gas outbursts occur in mines. On the one hand, these gas products affect the normal production of mines and the occupational health of miners; on the other hand, the gaseous products can also provide much important information to prevent mine disasters. Thus, the rapid and accurate determination of the component content of multicomponent mixed gases is of great significance. However, the distortion of gas chromatography measurement results, which deviate from the true values, has a serious impact on gas composition determination in mines. To reduce the influence of distortion, an Agilent 490 portable gas chromatograph is used to measure the component content of 11 groups of standard multicomponent mixed gases. It is found that the error rate of the measured result is highly related to the concentration of the selected reference component and the component to be measured. Besides, the key point of each gas concentration is determined according to the scatter diagram of the error rate. Each gas is divided into a high and a low concentration group by the key points, and each gas is selected as the reference component to measure the corresponding component concentration in other gases with multiple-point external standards. Researchers have used the least-squares method to fit univariate linear regression analysis between the measured values and true values of mixed gases. Then, the optimal analysis function and the optimal reference component concentration of each gas can be determined by comparing the regression analysis parameters. Finally, it is found that the error rate of measured values corrected by the optimal analysis function is significantly reduced. It is proved that this method can effectively alleviate the measurement results’ distortion, which solves the problem of gas composition determination in underground areas.

Intelligent-Technology-Empowered Active Emergency Command Strategy for Urban Hazardous Chemical Disaster Management

“…The joint detection of multi-principal gas sensors can make up for this deficiency. Li et al [74] pointed out that the rapid and accurate determination of the component content of multicomponent mixed gases is of great significance and designed a precise concentration measurement model of multicomponent mixed gases during a disaster. Lyu et al [75] provided a satellite-based edge computing dynamic warning terminal for hazardous chemical storage and transportation safety.…”

Quantitative analysis of reaction gases or exhaust using an online process mass spectrometer

“…Most online quantitative analysis methods with mass spectrometers are based on the formulation of the standard gas associated with the reaction gas or exhaust to detect ion abundances and pressures. These calibration parameters are then linearly fitted to establish a mathematical model for the software system to achieve online quantitative analysis of the reaction gas or exhaust [9][10][11][12][13][14][15].…”