燃气-蒸汽联合循环余热锅炉吹管工艺及优化

Process and optimization of pipe blowing of heat recovery steam generator in gassteam combined cycle unit

为提高余热锅炉吹管效率、增加吹管工作安全性,提出并实践了一种三阶段蓄能降压法吹管工艺,该工艺对锅炉高中压系统进行联合吹扫、低压系统单独吹扫,保证了管路吹扫效果,提高了吹管效率;通过降低燃气轮机排气温度,优化余热锅炉升温速率,解决了点火初期管道水击问题;正式吹管前采用迅速提高排烟温度的措施来提高蒸汽参数,减少了整个吹管过程的燃料和工时。打靶验收结果表明,锅炉蒸汽系统实际吹扫质量优良,吹管过程安全高效,相关经验可供后续同类机组参考。

In order to improve the efficiency of pipe blowing of heat recovery steam generator and enhance the safety of pipe blowing,a three-stage energy-storage and depressurization technique is put forward and practiced. The technique can be used to blow the high pressure system associated with medium pressure system,and separated from low pressure system,which ensures the effect of the pipe blowing,and improves the efficiency of the heat recovery steam generator. By reducing the exhaust temperature of the gas turbine,heating rate of heat recovery steam generator is optimized to solve the problem of water hammer in pipes at the initial stage of ignition. Increasing the temperature of exhaust smoke before the formal pipe blowing can improve the steam parameters,and decrease the fuel consumption and time of blowing process. The results of targeted acceptance show that the pipe blowing works well in the steam system of boilers,and the process of pipe blowing is safe and efficient.Relevant experience can be used as reference for subsequent similar units.