空气预热器入口烟气流量非平衡控制系统的研究开发

STUDY ON AND DEVELOPMENT OF NON-EQUILIBRIUM CONTROLSYSTEM FOR FLUE GAS FLOW RATE AT INLET OF AIR PREHEATER

针对电站锅炉回转式空气预热器出口烟气温度分布偏差形成的原因以及空气预热器低温腐蚀和堵灰的问题,研发了一种空气预热器入口烟气流量非平衡控制装置及系统,该系统能够有效提高空气预热器的抗低温腐蚀能力,为锅炉进一步降低排烟温度提供了可能。以某台600 MW机组锅炉为例,计算了采用烟气流量非平衡控制方式后初始端及末端小烟道在流量发生变化时,其吸热量和出口烟气温度的变化。

Directing against the causes resulting in deviation of temperature distribution for exit flue gas from the rotary air preheater of utility boilers,as well as the problems of low-temperature corrosion and ash clogging in the air preheaters,a non-equilibrium control facility and system for inlet flue gas flow rate of air preheaters has been developed.The said system can effectively enhance the low-temperature corrosion resistant ability of the air preheater,providing possibility for further reducing the temperature of discharged flue gas from boilers.Taking the boiler of one 600 MW unit as example,the variation of absorbed heat and temperature of exit flue gas during the lime of varrying the flow rate in small flue duct at initial end and final end has been calculated after adopting the non-equilibium control mode of flue gas flow rate.