基于红外测温的煤体瓦斯吸附-解吸过程温度变化特征研究

应用红外测温摄录仪分别对不同压力、不同变质条件下的煤体瓦斯吸附-解吸过程中温度变化进行测量,将红外数据进行小波滤噪后拟合出瓦斯吸附-解吸特征函数曲线。分析得出结论:不同平衡压力下吸附过程中升温趋势符合指数函数关系,解吸过程中降温趋势符合对数函数关系;煤体变质程度也会影响吸附-解吸过程中温度变化特征,煤体变质程度越大,吸附-解吸造成的温度变化幅度越大。拟合函数△T=K(1-et/b)参数K表征了吸附-解吸所引起的煤体温度变化最大值,温度变化最大值与煤体瓦斯解吸量成线性正相关。

Study on temperature change characteristics of coal gas adsorption-desorption process based on infrared measurement

The infrared temperature camera was used to measure the temperature changes of coal gas adsorption-desorption under different pressure and metamorphic conditions.The characteristic function curve of gas adsorption-desorption was fitted after the infrared data was filtered by wavelet.Analysis leads to conclusion:The temperature rising trend of adsorption process under different equilibrium pressure is in accordance with exponential function,while the temperature falling trend of desorption process is in accordance with logarithmic function;the degree of coal metamorphism also affects the temperature variation characteristics in the process of adsorption-desorption,the greater the degree of coal metamorphism,the greater the range of temperature variation caused by adsorption-desorption.The parameter K of the fitting function△T=K(1-et/b)represents the maximum temperature change of coal body caused by adsorption-desorption,and the maximum of temperature change is linearly and positively correlated with the coal gas desorption amount.