摘要
为了揭示AAEMs对生物质炭燃烧的影响机理,采用热重分析仪探究碱金属催化剂添加对生物质炭燃烧过程失重行为以及反应动力学机理的影响。探究不同催化剂条件下(NaOH、KOH、Ca(OH)_(2)、Mg(OH)_(2))生物质炭的燃烧过程及燃烧反应速率;然后采用Coats-Redfern模型求出燃烧反应的活化能以及指前因子。研究表明,AAEMs促进低温下生物质炭的燃烧反应,燃烧更迅速,且碱金属Na和K的催化效果明显高于碱土金属Ca和Mg;反应级数模型下的O_(2)机理更符合生物质炭的燃烧过程;NaOH和KOH的加入可明显降低燃烧反应的活化能,有益于生物质炭快速反应及燃尽,而Ca(OH)2和Mg(OH)2的加入对燃烧反应促进作用不明显。
Firstly,different catalyst addition(NaOH),KOH,Ca(OH)_(2),Mg(OH)_(2))on biochar combustion process and combustion reaction rate of biochar was investigated. The activation energy and pre-exponential factor were obtained with Coats-Redfern model. The results showed that alkali metal/alkaline earth metals addition promoted the combustion reaction of biochar and shifted the combustion to lower temperature with high mass velocity,and the catalytic effect of alkali metal Na and K is significantly higher than that of alkaline earth metals Ca and Mg;the O_(2) mechanism under the reaction series model is more in line with the combustion of biochar. The addition of NaOH and KOH significantly reduced the activation energy of the combustion reaction,which was beneficial to the rapid reaction and burnout of the biochar,while no obvious change showed for the addition of Ca(OH)_(2) and Mg(OH)_(2) addition.
作者
任喜熙
胡强
杨海平
王贤华
张世红
陈汉平
Ren Xixi;Hu Qiang;Yang Haiping;Wang Xianhua;Zhang Shihong;Chen Hanping(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第5期483-487,共5页
Acta Energiae Solaris Sinica
基金
国家重点研发计划(2019YFB1503901)
国家自然科学基金(52076100)。
关键词
生物质炭
燃烧
反应动力学
碱/碱土金属
biomass char
combustion
kinetics mechanism
alkali metal/alkaline earth metal
