A Gas Monitoring and Control System in a Coal and Gas Outburst Laboratory

Abstract

Coal and gas outburst is a phenomenon characterized by the ejection of gas and coal from the solid face of a mine. Physical minioutburst experiments are a very important tool for analyzing outbursts of coal and gas. However, few reports have focused on the safety problem produced by gas concentration or the role of gas spread during the physical experiments. In this study, we designed a simple monitoring and control system for the safety of staff during the minioutburst experiments. The results showed that, in the simulation of four dangerous situations, the system based on a sensors feedback loop can monitor the development of gas content in the temporal and spatial domains for the enhancement of accurate warnings. The system also automatically chooses the appropriate ventilation measures to lower the gas content considering different degrees of danger.

Problems in the Classification of Mine Gas Grades and Classification of Coal and Gas Outburst Mine Types

“…Combined with coal seam outburst intensity, statistical data and production practice, according to the amount of outburst coal, using three single indexes of coal seam gas pressure, coal seam gas content and coal seam firmness coefficient, the outburst risk degree of outburst coal seam is divided into four categories: weak outburst risk, medium outburst risk, strong outburst risk and extremely strong outburst risk [11] , as shown in Table 4. According to the actual outburst coal quantity, the outburst mines are divided into weak outburst mines, medium outburst mines, strong (serious) and extremely strong (extremely serious) outburst mines [11][12][13] , as shown in Table 5.…”

Effect of moisture on microwave ignition of bituminous coal

“…On the contrary, if coalbed methane is directly emitted into the atmosphere without utilization, its greenhouse effect is far greater than that of carbon dioxide [ 2 ]. Excessive accumulation of coalbed methane may also cause coal seam dynamic disaster [ 3 ]. Therefore, the exploitation of coalbed methane is a “win–win” strategy to energy utilization, environmental protection, and mining safety.…”

A Security Wireless Monitoring and Automatic Protection System for CCEL

“…The unadvanced databases cannot meet the requirement of most of the experimental facilities and cannot be used for the relevant information management system. In order to ensure the safety of workers and technicians, some students at Chongqing University have designed a system that may not only use sensors to monitor changes in the concentration of gases on site but also automatically select suitable ventilation facilities for different levels of danger to reduce the content of flammable and explosive gases [9,10]. Reference [11] designed a laboratory remote monitoring device, which achieves the real-time monitoring and gives the automatic voice alarm and alert message to the remote area or host area by using wireless network technology.…”