木质生物质定温热解炭化特性研究

Study on Characteristics of Woody Biomass Isothermal Carbonization

在自制大型热重实验平台上,进行了不同温度下松木颗粒的定温炭化热重实验,探讨木质生物质在不同温度下的炭化反应规律,并得到反应动力学参数.对炭化产物进行燃料特性分析,研究炭化温度对炭化产物特性的影响.结果表明:当炭化温度高于250℃时,所得松木炭燃料特性接近烟煤,进一步提高炭化温度后,其燃料特性逐渐接近无烟煤;当炭化温度超过650℃后,炭化过程中会发生一部分气化反应;生物质定温炭化过程中,随着反应程度的深入,反应动力学参数发生变化,表现为反应级数逐渐增大,表观活化能和相应的频率因子逐渐减小.

Experimental studies on isothermal pyrolysis characteristics of pine particles were carried out in a self-developed thermogravimetric test setup,so as to analyze the carbonization law of woody biomass particles at different reaction temperatures,and to obtain the kinetic parameters.Additionally,the influence of carbonization temperature on the charcoal properties was explored based on analysis of the carbonization products.Results show that the fuel property of pine carbon approaches bituminous coal when the carbonization temperature exceeds 250℃,which is similar to anthracite at further elevated carbonization temperature;a certain degree of gasification reaction occurs during the carbonization process when the temperature reaches 650 ℃.The kinetic parameters vary with the reaction degree during isothermal carbonization,manifesting as gradual increase in reaction order and gradual decrease in apparent activation energy and corresponding frequency factor.