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利用三种热解炉装置,分别在热解终温550℃～950℃、加热速率0.1K/s～500K/s下热解制取稻秆半焦。采用等温热重法,在STA409综合热分析仪上进行了稻秆半焦与CO2的气化实验,考察了热解终温、热解速率以及气化温度对半焦气化反应性的影响。研究表明,热解条件对稻秆半焦的反应性影响很大。在热解终温为550℃～950℃时,随着热解温度的提高,其气化反应性呈下降趋势;热解速率越高,其气化反应性越好。在850℃～950℃,提高气化温度能提高稻秆半焦与CO2的反应性。采用扫描电镜技术观测了0.1K/s和500K/s两种热解速率下半焦的表面形貌。结果显示,后者具有更加丰富的孔隙结构,且大孔结构明显多于前者。采用混合反应模型描述了稻秆半焦与CO2的气化反应过程,求取了反应动力学参数。
Three pyrolytic stoves were used to pyrolyze rice straw semi-coke at pyrolysis final temperature 550 ℃ ~ 950 ℃ and heating rate 0.1K / s ~ 500K / s, respectively. The isothermal thermogravimetric method was used to conduct the gasification experiments of rice straw semi coke and CO2 on the STA409 comprehensive thermal analyzer. The effects of pyrolysis end temperature, pyrolysis rate and gasification temperature on the gasification reactivity of semi coke were investigated. . The results show that pyrolysis conditions have a great influence on the reactivity of rice straw semi-coke. At the final pyrolysis temperature of 550 ℃ ~ 950 ℃, the gasification reactivity decreases with the pyrolysis temperature increasing. The higher the pyrolysis rate, the better the gasification reactivity. At 850 ℃ ~ 950 ℃, increasing the gasification temperature can increase the reactivity of rice straw semi coke and CO2. The surface morphology of the semi-coke under two pyrolysis rates of 0.1 K / s and 500 K / s was observed by scanning electron microscopy. The results show that the latter has a richer pore structure, and the macropore structure is significantly more than the former. The mixed reaction model was used to describe the gasification process of rice coke semi-coke and CO2, and the reaction kinetic parameters were obtained.