湿法烟气脱硫对锅炉稳定运行的影响与对策分析

火电厂采用烟气脱硫(Flue Gas Desulfuri zation,FGD)是减少SO2排放的一个有效措施,其中以石灰石石膏湿法脱硫技术最为成熟。但FGD系统中增压风机控制系统的不可靠和GGH堵塞的问题,对锅炉稳定运行带来很多不良影响。实际应用中,可以通过打开脱硫系统旁路挡板、改变控制模式来提高锅炉烟风系统的稳定性,通过改善GGH在线冲洗方式等措施有效控制堵塞。针对这些问题以定州电厂为例做了较为深入的分析和研究。

Effect of Wet-method Flue Gas Desulfurization on Boiler Stable Operation and Analysis of Related Countermeasures

The use of flue gas desulfurization(FGD) in power plants is one of the effective measures to reduce SO2 emissions,among which limestone/plaster wet method desulfurization technology is the most proven one.However,in the FGD system,such problems as unreliability of the supercharged fan control system and a blockage in a gas-gas heater(GGH) have brought about many adverse effects to boiler stable operation.In practical applications,it is possible to open a bypass baffle in the desulfurization system and change the control mode to enhance the stability of boiler flue gas and air system.Measures,such as improving the GGH on-line wash mode etc.may be taken to effectively control the blockage.With Dingzhou Power Plant serving as an example,an in-depth analysis and study was conducted to seek solutions to the above problems.