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利用小型固定床反应器对棉杆和木屑进行了炭化制焦实验,利用热重分析仪对制得的生物质炭进行氧化实验。基于综合反应速率方程推导了生物质炭氧化过程气固反应机理,并对热重实验结果进行拟合计算。实验结果表明,随着制焦炭化温度的升高,生物质炭的着火温度和燃尽温度升高,燃烧特性指数S减小;棉杆炭综合燃烧性能优于木屑炭。棉杆炭在低温段和高温段燃烧的反应机理不同,低温段燃烧反应的机理是片状内扩散反应机理,高温段燃烧反应的机理是球形界面化学反应机理。木屑炭的反应机理是球形界面化学反应机理。拟合计算求得的活化能并不能反映出生物质炭进行燃烧反应的难易程度。
A small fixed bed reactor was used to make carbonized cokemaking experiments on cotton stalk and wood chips. The obtained biomass carbon was oxidized by a thermogravimetric analyzer. Based on the integrated reaction rate equation, the gas-solid reaction mechanism of biomass carbon oxidation process was deduced and the thermogravimetry results were fitted and calculated. The experimental results show that with the increase of coke temperature, the ignition temperature and burnout temperature of biomass charcoal increase, and the combustion index S decreases. The comprehensive combustion performance of cotton stalk charcoal is better than that of wood charcoal. The reaction mechanisms of cotton stalks burning at low temperature and high temperature are different. The mechanism of combustion reaction in low temperature is diffusion reaction within flake. The mechanism of combustion reaction at high temperature is the chemical reaction mechanism of spherical interface. Wood charcoal reaction mechanism is the spherical interface chemical reaction mechanism. The activation energy obtained from the fitting calculation does not reflect the ease of combustion of the biomass carbon.