Technical economic study on type selection of slag cooler for a 660 MW ultra-supercritical CFB boiler
Wu Wanzhu
Abstract：To compare the effects of different types of slag cooler on energy consumption of 660 MW ultra-supercritical CFB boiler,the variation of the efficiency and the power consumption of the plant using air-water combined slag cooler and the roller slag cooler were analyzed,then the amount of coal consumption of the unit with different slag coolers was calculated.A selection scheme of the slag cooler was proposed.Different schemes were compared.The results indicates that the slag quantity and standard coal price of the unit have an important effect on the selection of slag cooler.With standard coal price and slag quantity increases,the economy of the unit with air-water combined slag cooler is better than that with rolling ash cooler.Considering technical economy and reliability of the slag cooler,the scheme of mix-using air-water combined slag cooler and the rouing ash cooler is recommended.The research provides reference for the type selection of slag cooler in a CFB boiler burning low calorific value coal.
Keywords：ultra-supercriticalCFB boilertype selection of slag coolerair-water combined slag cooler
Publication Date：2017-01-01