THE AUTOMATIC TEMPERATURE CONTROL DEVICE FOR HRSG(HEAT RECOVERY STEAM GENERATOR) OF CCPP (COMBIN EDCYCLE POWER PLANT)

摘要

The present invention improves and maintains the temperature of superheated steam produced by the heat recovery steam generator (HRSG) using the high temperature of waste gas generated by the gas turbine in the combined cycle power plant. It is related to the equipment for the waste gas discharged from the gas turbine temperature and flow rate is always changed according to the gas turbine load fluctuations, so that you can select the superheated steam of the steam generator to maintain a constant steam temperature in accordance with the load fluctuations By providing a temperature control device, a superheated steam temperature main controller 29 and a main steam quantity measuring instrument for receiving a signal from the superheated steam temperature measuring device 26 installed at the main steam outlet pipe of the steam generator 3. 27) the first and second coolant outlet temperature controllers 30, which are connected to the signal and the steam cooler temperature measuring instrument 28 at the rear end of the steam cooler injection nozzle 25, 31) and control valves (21, 22) for controlling the amount of coolant with an injection nozzle (25) for spraying coolant between the primary steam heater (23) and the secondary steam heater (24), When the plant is operated at the initial load or the steam generation amount 26 at the lowest load (30% or less of the maximum load), the superheated steam temperature main controller 29 signal and the steam generation meter 27 are simultaneously connected to the first cooling water outlet temperature controller ( The output control signal is directly transmitted to the low load flow regulating valve 21 using only 30), and if the steam generation amount 26 is operated above the maximum load (30 & less of the maximum load), the superheated steam temperature main controller (29) The temperature of the secondary superheater outlet is always controlled by controlling the temperature by directly transmitting the output signal to the normal load flow control valve 22 using only the second coolant outlet temperature controller 31 in parallel with the signal and the steam generation meter 27. To keep it constant The.