Abstract: Circulating fluidized bed (CFB) incinerator is a new type of incineration technology. The benefits of circulating fluidized bed incinerator include wide application, stable combustion and low emission. High temperature corrosion of the superheater can be avoided and bed temperature can be adjusted flexibly if the boiler steam pressure, temperature parameters and capacity are increased by the arrangement of the external heat exchanger (EHE). Although related researches on external heat exchangers have been done at home and abroad at present, they are mainly focused on coal-fired boilers in power plants. The EHE is seldom used in municipal solid waste (MSW) because of the low boiler steam pressure and temperature parameters. In this paper，research status of CFB incinerator with external heat exchanger were reviewed. The current situation and technical problem of CFB coal-fired boiler with external bed at home and abroad which has same heat exchange principle and great reference value were also introduced. The influencing factors related to the heat transfer coefficient and fluidization characteristics inside EHE were analyzed, problems in experiment and EHE, such as large temperature deviation at the outlet of heating surface and poor fluidization quality in the side wall area were pointed out, the improvement measures were put forward, and the future research idea of external heat exchanger for MSW CFB incinerator is proposed. In the end, the current research emphases were summarized, and the improvement measures for the experiment and EHE test were put forward, which provides reasonable suggestions for the future manufacturing of the high-parameter waste incinerator.

Key words: waste incinerator, external heat exchanger, heat transfer coefficient, fluidization characteristics, thermal deviation

摘要： 循环流化床垃圾焚烧炉作为一种新型焚烧处理技术，具有适用范围广、燃烧稳定、排放低等优点。布置外置换热器可以在提高锅炉蒸汽的压力、温度参数及容量的同时避免过热器高温腐蚀，灵活调节床温。虽然目前国内外对外置换热器已有相关研究，但以电站燃煤锅炉为主。垃圾焚烧炉由于锅炉蒸汽的压力和温度参数较低，采用外置换热器还很少。本文综述了带外置换热器的循环流化床垃圾焚烧炉的研究现状，同时介绍了具有相同换热原理，极具参考价值的带外置床的循环流化床燃煤锅炉的国内外研究现状，分析了与床内传热系数、流化特性相关的影响因素，指出在实验和实炉运行时存在受热面出口壁温热偏差较大、边壁区域流化质量不佳的问题，并提出了改进措施。最后总结当前的研究重点，提出了针对实验台和实炉测试的改进措施，并针对垃圾流化床外置换热器的研发提出了今后的研究思路，为今后建设高参数垃圾焚烧炉提供了合理建议。

关键词: 垃圾焚烧炉, 外置换热器, 传热系数, 流化特性, 热偏差