Abstract:

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.

Key words:

gassteam combined cycle, waste heat boiler, depressurization technique, steam pipe blowing, optimization practice