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Study of the kinetic behaviour of biomass and coal during oxyfuel co-combustion

Study of the kinetic behaviour of biomass and coal during oxyfuel co-combustion

作     者:Oris Chansa Zhongyang Luo Chunjiang Yu Oris Chansa;Zhongyang Luo;Chunjiang Yu

作者机构:State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027China 

出 版 物:《Chinese Journal of Chemical Engineering》 (中国化学工程学报(英文版))

年 卷 期:2020年第28卷第7期

页      面:1796-1804页

核心收录:

学科分类:12[管理学] 081702[工学-化学工艺] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 081104[工学-模式识别与智能系统] 08[工学] 0817[工学-化学工程与技术] 0835[工学-软件工程] 0811[工学-控制科学与工程] 0812[工学-计算机科学与技术(可授工学、理学学位)] 

基  金:Financed by the International Cooperation Foundation for ChinaUSA(NSFC-NSF 51661125012) 

主  题:Oxyfuel co-combustion Thermogravimetric analysis Kinetic analysis Activation energy Thermal degradation 

摘      要:In this study,the thermogravimetric analysis(TGA)method has been used to evaluate the kinetic behavior of biomass,coal and its blends during oxyfuel *** thermogravimetric results have been evaluated by the Coats-Redfern method and validated by Criado’s *** and DTG curves indicate that as the oxygen concentration increases the ignition and burn out temperatures approach a lower temperature *** combustion characteristic index shows that biomass to coal blends of 28%and 40%respectively can achieve enhanced combustion up to 60%oxygen *** the devolatilization region,the activation energies for coal and blends reduce while in the char oxidation region,they increase with rise in oxygen ***,however,indicates slightly different combustion characteristic of being degraded in a single step and its activation energies increase with rise in oxygen *** is demonstrated in this work that oxygen enrichment has more positive combustion effect on coal than *** 20%oxygen enrichment,28%and 40%blends indicate activation energy of 132.8 and 125.5 kJ·mol^-1 respectively which are lower than coal at 148.1 kJ·mol^-1 but higher than biomass at 81.5 kJ·mol^-1 demonstrating synergistic effect of fuel ***,at char combustion step,an increase in activation energy for 28%blend is found to be 0.36 kJ·mol^-1 per rise in oxygen concentration which is higher than in 40%blend at 0.28 kJ·mol^-1.

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