关键词: 垃圾焚烧炉, 外置换热器, 传热系数, 流化特性, 热偏差

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