The exit feed water temperature control unit null gas turbine of the gas high tension feed heater in the exhaust air revival die

摘要

PROBLEM TO BE SOLVED: To control water supply temperature at an outlet of a gas high pressure water supply heater by adjusting the flow rate of supply water distributed to a high pressure water supply heater and the gas high pressure water supply heater through the opening adjustment of a flow rate adjusting valve of the high pressure supply water heater. ;SOLUTION: There is estimated a supply water flow rate corrected value of a high pressure supply water heater based upon an outlet supply water temperature deviation 29 between an outlet supply water temperature set value 25 of a gas high pressure supply water heater and outlet supply water temperature of the gas high pressure supply water heater on the basis of a boiler loading instruction 19. Then, a supply water flow rate correction set value of a high pressure supply water heater is estimated by adding the supply water flow rate correction value to a supply water flow rate set value 27 of the high pressure supply water heater based upon the boiler loading instruction 19 such that a supply water lowest flow rate of line high pressure supply water heater. Hereby, an opening of a flow rate adjusting valve 12 of the supply water heater is adjusted in response to a supply water flow rate deviation 39 between the supply water flow rate correction set value 37 and an actual supply water flow rate 23, and hence the outlet supply water temperature 18 of the gas high pressure supply water heater 11 is controlled.;COPYRIGHT: (C)1998,JPO