基于内循环预热器的超低挥发分碳基燃料预热燃烧试验  

Experiment on preheating combustion of ultra-low volatile carbon-based fuel by an internal circulation preheater

作　　者：宋文浩 李诗媛[1,2,3] 欧阳子区 刘敬樟[1] SONG Wenhao;LI Shiyuan;OUYANG Ziqu;LIU Jingzhang(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Dalian National Laboratory for Clean Energy,Dalian 116023,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049 [3]中国科学院洁净能源创新研究院,辽宁大连116023

出　　处：《华电技术》2020年第10期73-80,共8页HUADIAN TECHNOLOGY

基　　金：中国科学院战略性先导科技专项课题(XDA21040100);中国科学院青年创新促进会项目(2019148)。

摘　　要：基于预热燃烧技术,提出了一种适合于细粉燃料稳定预热的内循环预热器,以期实现超低挥发分碳基燃料的清洁高效利用。先后在内循环预热器冷态试验台、2 MW内循环预热燃烧中试平台,以及16 MW预热式燃烧器测试平台研究了内循环预热器的运行特性,并且对超低挥发分碳基燃料的预热、燃烧和NOx排放特性进行了系统研究。试验结果表明,内循环预热器在流化风速为1.50~2.25 m/s范围内进出物料平衡,能够建立稳定循环。内循环预热器实现了稳定的预热过程,将燃料稳定、持续地预热到850℃以上,满足预热燃烧工艺的要求。高温气体燃料主要包括N2,H2,CO,CH4和CO2。燃料中57.08%的氮元素在内循环预热器内被释放。经检测分析,燃烧效率高于97%,NOx排放质量浓度降低到112.7 mg/m3(@6%O2)。On the basis of preheating combustion technology,an internal circulating preheater for the stable combustion of fine powdered fuel was proposed,which was aimed at the clean and efficient utilization of ultra-low volatile carbon-based fuel.The operating characteristics of the internal circulating preheater was investigated on an internal circulating preheater cold test rig,a 2 MW internal circulating preheating combustion pilot test rig and a 16 MW preheater testing platform successively.Also,the characteristics of preheating,combustion and NOx emission of ultra-low volatile carbon-based fuel were discussed.The results showed that the material balance and a stable circulation could be established in the internal circulating preheater when fluidizing air velocity was in the range of 1.50—2.25 m/s.A stable preheating process was realized by preheating the fuel in the internal circulating preheater steadily and continuously to 850℃and above,thereby meeting the requirement of the preheating combustion process.The high-temperature gas fuel mainly included N2,H2,CO,CH4 and CO2.And 57.08%of nitrogen element was released in the internal circulating preheater.Proven by testing,the combustion efficiency was higher than 97%,and NOx emission reduced to 112.7 mg/m3(@6%O2).

关 键 词：内循环预热器 预热燃烧 超低挥发分碳基燃料 NOX排放 

分 类 号：TM621.2[电气工程—电力系统及自动化]