超超临界350 MW富氧燃烧循环流化床设计  

Design of an ultra-supercritical 350 MW oxy-CFB

作　　者：张奇月 颜勇 段元强[1] 段伦博[1] ZHANG Qiyue;YAN Yong;DUAN Yuanqiang;DUAN Lunbo(Key Laboratory of Energy Thermal Conversion and Control,Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《热力发电》2020年第5期73-80,共8页Thermal Power Generation

基　　金：国家重点研发计划项目(2018YFB0605301)。

摘　　要：富氧燃烧循环流化床是一种新型的碳捕集技术,具有广泛的应用前景。O2/CO2气氛下锅炉受热面的布置与热负荷的分配是阻挠富氧燃烧循环流化床进一步示范的关键问题。本文分别采用Johnsson模型和颗粒团更新模型对350 MW机组循环流化床锅炉进行一维建模,对氧体积分数为30%的富氧燃烧循环流化床锅炉进行了耦合汽水系统的总体概念设计,并与空气燃烧的同等级循环流化床锅炉尺寸进行了对比。结果表明:富氧燃烧循环流化床锅炉的排烟热损失大大减小,设计锅炉热效率可达94.18%;富氧燃烧循环流化床锅炉布风板面积、炉膛截面积以及尾部烟道面积均比空气燃烧循环流化床锅炉大幅减小,但需要增设外置床换热器来吸收热负荷。本研究对富氧燃烧循环流化床锅炉的进一步放大具有借鉴意义。Oxy-fuel circulating fluidized bed(CFB)is a novel CO2 capture technology with bright application prospects.The layout of boiler heating surface and the distribution of heat load are the key to further demonstration of oxy-fuel combustion.The Johnsson model and particle cluster renewal model were used to set up a onedimensional model for 350 MW CFB boiler,and the overall conceptual design of the oxy-CFB boiler layout in 30%O2/70%CO2 atmosphere integrated with steam system was performed.Moreover,the geometry of the designed boiler was compared with an air-fired CFB boiler with the same capacity.The results show that,for the oxy-CFB boiler,the heat loss of exhaust gas greatly reduces and the boiler thermal efficiency can reach 94.18%.Compared with the air-fired CFB boiler,the oxy-CFB boiler’s air distributor area,furnace cross-sectional area and tail flue duct area decreases significantly,it is necessary to add external heat exchanger to absorb the heat load.The study provides a reference for further scale up of oxy-CFB boilers.

关 键 词：循环流化床 富氧燃烧 概念设计 锅炉效率 尺寸 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]