Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Jun Taguchi

Kentaro Nakamura

Yuji Ohta

Tomoya Hayashi

Kei Moriyama

Satoru Matsuo

Ken Tamura

In the present invention, a coal gasification combined power generation facility comprises: a feed water supply line (); a condensate pump () and an intermediate-pressure feed water pump (); a turbine bypass line () that bypasses a steam turbine and supplies steam to the condenser (); and a spray water line () that supplies the feed water to the turbine bypass line (). The coal gasification combined power generation facility has a normal operation mode and a bypass operation mode, and in the bypass operation mode, a control device () supplies the feed water to the turbine bypass line () and performs a first opening degree control to control the opening degree of the supply adjustment valve so that the amount of feed water supplied to the exhaust heat recovery boiler becomes less than that in the normal operation mode.

Combined power generation plant and combined power generation plant control method

The purpose of the present invention is to maintain the intake pressure of a water supply pump at an operable pressure. A boiler is provided with: condensate pumps (a condensate pump and an auxiliary condensate pump); a branch line that causes water delivered by the condensate pumps to branch; a drum (a low-pressure drum) that is connected to one (a low-pressure branch line) of two lines into which the branch line branches; and a water supply pump that is connected to the other (a high-pressure branch line) of the two lines into which the branching line branches and that pumps water to an evaporator (a high-pressure evaporator). The boiler is additionally provided with pressure applying means that guides a portion of the water in the drum to the water supply pump side when the intake pressure on the inlet side of the water supply pump has become lower than a predetermined pressure.

Boiler, combined cycle plant, and boiler operation method

The purpose of the present invention is to decrease the loss of energy of flue gas when superheated steam is cooled and prevent heat efficiency from being decreased. A boiler is provided with: economizers (a medium-pressure economizer () and a high-pressure secondary economizer ()) which heat water supplied by water supply pumps (a medium-pressure water supply pump () and a high-pressure water supply pump ()); evaporators (a medium-pressure evaporator () and a high-pressure evaporator ()) which evaporate the water that is heated by the economizers; and cooling devices (a medium-pressure system and a high-pressure system) which mix water, as a coolant, which has passed through the economizers via the water supply pumps with steam.

Boiler, combined cycle plant, and steam cooling method for boiler

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Kanagawa, Japan

Jun Taguchi