粒径和吸附平衡压力对无烟煤残存瓦斯含量的影响

Influence of Coal Particle Size and Adsorption Equilibrium Pressure on Residual Gas Content of Anthracite

为了研究粒径和吸附平衡压力对残存瓦斯含量的影响,在实验室分别对0~0.25 mm、0.25~0.5 mm、0.5~1 mm、1~3 mm、3~6 mm 5种不同粒径和0.5、1.0、1.5、2.5 MPa 4种不同平衡压力下残存瓦斯含量进行了测定,并据此分析了粒径和吸附平衡压力对残存瓦斯含量的影响。实验结果表明:无烟煤残存瓦斯含量随粒径的增加逐渐增大,两者成正相关关系,但增幅逐渐减小,残存瓦斯含量随粒径的变化符合朗格缪尔式函数,当粒径超过6 mm后,残存瓦斯含量趋于定值;残存瓦斯含量随吸附平衡压力的增高无明显变化,吸附平衡压力对残存瓦斯含量影响较小。通过对现行公式计算值和实验实测值对比分析,基于粒径对残存瓦斯含量的影响,提出了现行残存瓦斯含量计算公式补偿方法。

In order to research the influence of coal particle size and adsorption equilibrium pressure on residual gas content of anthracite, we tested the residual gas content of 0 -0.25 mm, 0.25 -0.5 mm, 0.5 -1 mm, 1 -3 mm, 3 -6 mm 5 different particle sizes and 0.5, 1.0, 1.5, 2.5 MPa 5 kind different adsorption equilibrium pressure in the laboratory, analyzed the influence of particle size and adsorption equilibrium pressure on residual gas content. Test results show that the residual gas content increases with the increase of particle size, there is a positive correlation between coal particle size and residual gas content, but it has the maximum particle size. The increase of residual gas content decreases with the increase of particle size. The variation of residual gas content with particle size agrees with Langmuir＇s function. The residual gas content tends to be fixed when the particle size is more than 6 mm; the residual gas content has no obvious change with the increase of adsorption equilibrium pressure, the adsorption equilibrium pressure has little influence on the residual gas content. By comparing the calculated values with the experimental ones, based on the influence of particle size on residual gas content, the existing residual gas content calculation formula and compensation method are proposed.