循环流化床锅炉风烟系统的优化

为防止锅炉结焦（主要是高温结焦），需要维持较高的锅炉一次风量。设计院在对风机选型时，选择一次风机的富余量过大，造成电厂的厂用电率较大。同时，由于使用高压头风机，造成空气预热器的漏风率较大。一般大型循环流化床机组厂用电率在10％左右，这是制约循环流化床机组大型化的一个主要因素。对锅炉风烟系统进行优化并采取了必要的改造措施后，厂用电率在原基础上下降1．62％，取得了良好的效果。

Optimization of air and flue gas system of CFB boiler

In order to prevent coking of boiler (mainly high temperature coking),it is necessary to keep higher primary air flow.But the surplus capacity of primary air fan selected by design institute may be too larger to cause larger house service consumption rate.Simultaneously,the application of the high pressure fan can cause larger air-heater leakage factor.The house service consumption rate of large CFB unit is commonly about 10%,and this is main factor restricting large-scalization of CFB unit.The air and flue...