660 MW超超临界CFB锅炉冷渣器选型技术经济性研究

为比较不同型式的冷渣器对660 MW超超临界CFB锅炉机组能耗的影响,通过分析使用风水联合冷渣器及滚筒冷渣器时锅炉效率、厂用电率的变化,计算超超临界CFB机组使用不同冷渣器时供电煤耗的大小。提出冷渣器选型方案,对不同方案进行经济性比较。研究表明,底渣量和标煤单价对冷渣器选型有重要影响,标煤单价高、底渣量大的项目,宜选用风水联合冷渣器,技术经济性好。为了兼顾冷渣器的技术经济性和运行可靠性,可采用风水冷渣器与滚筒冷渣器搭配使用的方案。研究内容可为燃用低热值煤的CFB锅炉冷渣机选型提供参考。

Technical economic study on type selection of slag cooler for a 660 MW ultra-supercritical CFB boiler

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.