CONTROL SYSTEM FOR EXTRACTED STEAM AND EXHAUST PRESSURE OF STEAM SUPPLY AND POWER GENERATING FACILITY

PURPOSE:To enable the increase in the quantity of steam necessary for process and carry out pressure controlling thereof, by ascending the water level of drain formed in a heat exchanger above a prescribed water level so as to reduce heat transfer area. CONSTITUTION:When the desired quantity of steam in a process 8 increases more than a prescribed value, a steam governor valve 3 is opened to a full opening direction so that the charged quantity of steam from a boiler 1 is increased. Then, in a case that there is scarcity of steam even opening is completely opened, the opening adjustment of the bypass valve 10 of a steam turbine 2 is carried out. But the water level L1 of a heat exchanger 5 is adjusted and ascended to a water level L2 by a water level controller 7 and an adjusting valve 8 because the quantity of exhaust steam pressure-controllable within a rated evaporation quantity must be increased. Therefore, the quantity of extracted steam from the steam turbine 2 is reduced because the heat transfer area of the heat exchanger 5 is reduced. And the quantity of steam for the process 8 is increased that much, pressure control by a pressure controller 9 also is enabled. Thus, the increased quantity of steam in the process can be quickly dealt with.