CFB富氧燃烧中CO2对煤焦与NO还原作用的影响  

Effect of CO_2 on Coal Char-NO Reduction Process in CFB Oxy-fuel Combustion

作　　者：李相鹏[1,2] 张世红[1] 廖新杰 刘一[1] 杨海平[1] 陈汉平[1] 

机构地区：[1]华中科技大学能源与动力工程学院,煤燃烧国家重点实验室,武汉430074 [2]武汉凯迪电力环保有限公司,武汉430223

出　　处：《工程热物理学报》2016年第12期2703-2709,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助(No.51276075,No.51576088)

摘　　要：为了考察高浓度CO_2对煤焦与NO还原所带来的影响,本文在悬浮床反应器上开展了。N_2和CO_2气氛下煤焦与NO的还原实验。结果表明:在无煤焦或矿物组分催化下CO不与NO发生反应;900℃N_2气氛下,在煤焦与NO反应初期NO还原率保持不变,而在整个反应过程中碳比反应率和CO_2生成比例则持续增大;N_2气氛下,煤焦与NO反应的含碳产物在700℃时以CO_2为主,而随着温度升高CO的生成比例增大,900℃时CO的生成占主导地位;高浓度的CO_2对煤焦-NO还原反应有明显的抑制作用,且温度越高抑制作用越显著,这可能是因CO_2气化抢占碳活性位所致。To investigate the influence of high concentration CO2 on coal char-NO reduction process,char-NO reduction experiment in N2 and CO2 atmosphere was carried out in a suspension bed reactor system.Results show that CO does not react with NO when coal char or mineral components do not exist.At 900℃ under N2 atmosphere,NO reduction ratio remains constant in the initial stage,while the intrinsic rate of carbon reaction and CO2 yield keep increasing in the whole process.In N2 atmosphere,CO2 is the main carbon containing products of the coal char-NO reaction at 700℃,while the CO yield increases with the increase of temperature and CO is the dominant product at 900℃.High concentration of CO2 has obvious inhibiting effect on coal char-NO reduction reaction and the inhibiting effect become more remarkable as the temperature increasing,it may be due to some carbon active sites are occupied in the CO2 gasification process.

关 键 词：NO还原 富氧燃烧 CO2气氛 CFB 

分 类 号：TK16[动力工程及工程热物理—热能工程]