基于煤粒扩散理论的吸附态瓦斯解吸膨胀能研究

Study on desorption expansion energy of adsorptive gas based on diffusion theory

为了研究吸附态瓦斯解吸膨胀能,以煤粒扩散理论为基础描述参与煤与瓦斯突出的瓦斯量,得到吸附态瓦斯解吸膨胀能公式,研究了煤的粒度、扩散系数、瓦斯压力对煤粒吸附态瓦斯解吸膨胀能释放的影响及膨胀能释放模式。结果表明:随着煤粒粒度减小和扩散系数增大,瓦斯解吸膨胀能释放强度迅速增大;瓦斯压力越大,煤粒粒度、扩散系数对瓦斯解吸膨胀能的影响越明显,在高压区粒度减小0.1 mm,瓦斯解吸膨胀能释放强度呈倍数增长。因此,降低瓦斯压力可以有效减小瓦斯解吸膨胀能的释放强度,是防止突出发生的重要措施。

This article is aimed at presenting our study findings of the desorption expansion energy of the adsorptive gas based on the diffusion theory,which is essential for the progressive transformation of coal and gas outburst into the expanding energy of the adsorption gas.In order to study the release process of such gas expanding energy,we have made a detailed description of the amount of gas that participates in the coal and gas outburst in accordance with the diffusion theory of the coal particles.At the same time,we have also established the formula of the adsorptive gas-expansion energy of the adsorption gas.And,next,with the help of the established formula,we have analyzed the impact of the coal particle size,the diffusion coefficient and the gas pressure on the desorption of the gas-expanding energy.And,on the basis of what we have done,we have made a discussion of the release mode of the desorption gas-expanding energy.The results of our study show that the release intensity of the desorption gas expansion energy tends to increase rapidly with the decrease of the coal particle size.On the condition that the coal particles are of equal size,the release intensity of the gas expansion energy grows with the increase of the diffusion coefficient.The greater the gas pressure,the greater impact the diffusion coefficient and the coal particle size will make on the gas-expanding energy.On the other hand,if the coal particle size decreases by 0.1 mm,the release intensity of the said expansion energy would increase exponentially in the high-pressure zone.Thus,the way of the gas pressure reduction can be taken as an important measure to prevent the outburst as it can effectively reduce the releasing intensity of the gas expansion energy.Moreover,in the real situation of the coalmine,when the coal engenders instability and failure to make coal with high gas pressure exposure and crack,the desorption gas which follows the free gas carrying coals and push the progress of coal and gas outburst.As a result,the coal and gas outburst is formed.The results of our study are of great significance to understand the function of the gas in promoting the coal and gas outburst and effective prevention of such outburst.