电厂燃煤锅炉烟气余热回收的优化利用

Optimization of waste heat recovery of flue gas from coal-fired boilers in power plants

在我国现役火电机组中,排烟热损失是电站锅炉各项热损失中最大的一项,一般为5%,~8%,,占锅炉总热损失的80%,或更高。影响排烟热损失的最主要因素是锅炉排烟温度,而目前我国火电机组锅炉排烟温度偏高是一个普遍现象,一般维持在110~150,℃.通常情况下,排烟温度每升高10,℃,排烟热损失增加0.6%,~1.0%,若以燃用热值为20,MJ/kg煤的410,t/h高压锅炉为例,则每年多消耗近万吨动力用煤。本文浅析电厂燃煤锅炉烟气余热回收的优化利用。

Absrtact: in China, the heat loss of exhaust smoke is the biggest of all kinds of heat loss of power plant boilers, which is usually 5% or more, accounting for 80% or higher of the total heat loss of boilers. The main factor affecting the heat loss of exhaust gas is boiler exhaust gas temperature. At present, it is a common phenomenon that the boiler exhaust gas temperature of thermal power units in China is on the high side, which is generally maintained at 110~150℃. Normally, for every 10℃ rise in exhaust gas temperature, the heat loss of exhaust smoke increases 0.6% and 1.0%. If the 410t/h high-pressure boiler burning 20 MJ/kg coal is used as an example, it will consume nearly 10,000 tons more each year. Power coal This paper analyzes the optimal utilization of waste heat recovery of flue gas from coal-fired boiler in power plant.