Effect of aeration on fast gas pressure tests  

作　　者：CHEN Yu-jia JIANG Cheng-lin LI Xiao-wei TANG Jun WANG Chen YANG Fei-long WANG Fa-kai ZHANG Chao-jie DENG Shu-hua 

机构地区：[1]School of Safety Engineering, China University of Mining ＆ Technology, Xuzhou, Jiangsu 221008, China

出　　处：《Mining Science and Technology》2009年第6期756-760,共5页矿业科学技术（英文版）

基　　金：Project 2006CB202204-3 supported by the National Basic Research Program of China

摘　　要：Given the problem of the long time required for testing gas pressure, we propose a fast-test method in which we used a technique of fast borehole sealing and air replenishing. Based on the characteristics of gas emission from boreholes to be tested, we built a theoretical model for calculating parameters during the process of increasing natural pressure and aeration. Using this model, we investigated the effect of different aeration conditions on velocity of pressure tests. The result shows that: 1) aerating air into boreholes can speed up gas pressure tests and 2) the more similar the pressure of the aerated air to the original gas pressure, the smaller the gas volume absorbed by coal and the shorter the time needed in pressure test. A case study in the Lu’an mining area shows that the time needed for gas pressure test is only 4 h using our method of aeration and 29 h under conditions of increasing natural pressure, saving time by 86.2%. This case study also indicates that, by using the aeration method, only one hour is needed for gas pressure to reach a stable state, which breaks the record of the shortest time needed for gas pressure tests in China.Given the problem of the long time required for testing gas pressure, we propose a fast-test method in which we used a technique of fast borehole sealing and air replenishing. Based on the characteristics of gas emission from boreholes to be tested, we built a theoretical model for calculating parameters during the process of increasing natural pressure and aeration. Using this model, we investigated the effect of different aeration conditions on velocity of pressure tests. The result shows that： 1） aerating air into boreholes can speed up gas pressure tests and 2） the more similar the pressure of the aerated air to the original gas pressure, the smaller the gas volume absorbed by coal and the shorter the time needed in pressure test. A case study in the Lu’an mining area shows that the time needed for gas pressure test is only 4 h using our method of aeration and 29 h under conditions of increasing natural pressure, saving time by 86.2%. This case study also indicates that, by using the aeration method, only one hour is needed for gas pressure to reach a stable state, which breaks the record of the shortest time needed for gas pressure tests in China.

关 键 词：AERATION gas pressure fast test aeration pressure adsorption quantity 

分 类 号：X703[环境科学与工程—环境工程] TP311.13[自动化与计算机技术—计算机软件与理论]