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针对工业气化炉二级旋风分离器捕集的气化后半焦,利用高温携带流反应器进行高温燃烧反应特性实验。对1273和1573 K两个温度,5%和20%两个烟气含氧量,在反应器轴向不同停留时间下采得半焦样。采用自动吸附仪(ASAP 2020)测定半焦样氮吸附等温线,对氮吸附等温线形态、BET比表面积及BJH孔容积等孔结构参数进行了分析,并结合分形维数测量和扫描电镜对燃烧过程中气化半焦孔隙结构变化规律进行研究分析。研究表明所采集的半焦样吸附等温线为典型Ⅱ类吸附等温线,高温和较高烟气含氧量对半焦孔隙结构变化有促进作用,半焦燃烧反应中比表面积变化趋势与半焦燃烧反应速率变化趋势相似,后期燃尽速率主要由焦炭本征反应活性决定。
Aiming at the semi-coke gasification after the gasification of the industrial gasifier secondary cyclone, the high temperature combustion reactor was used to carry out high temperature combustion reaction. Two flue gases, oxygen at 5% and 20%, at 1273 and 1573 K, were taken at different temperatures in the axial direction of the reactor. The semi-coke-like nitrogen adsorption isotherms were determined by automatic adsorption device (ASAP 2020), and the pore structure parameters such as nitrogen adsorption isotherms, BET specific surface area and pore volume of BJH were analyzed. Combining fractal dimension measurement and scanning electron microscope The process of gasification of semi-coke pore structure of the law of change. The results show that the semi-coke-like adsorption isotherms are typical type Ⅱ adsorption isotherms. The high-temperature and high-flue gas oxygen content can promote the change of pore structure of semi-coke. The change of specific surface area in semi-coke combustion reaction and semi-coke The change trend of combustion reaction rate is similar. The rate of burn-out in the later period is mainly determined by the intrinsic reactivity of coke.