Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Daiki Fujimura

Susumu Sekine

Ayumu Kuroshima

Masayuki Murakami

Motohiro Goshima

Kazushige Kuwazuru

Takafumi Niwa

Tatsuki Ueda

A method for cleaning a steam system including an intermittent operation processing step and a commissioning processing step are executed. The intermittent operation processing step includes: a no-load operation step in which a gas turbine is operated with no load, with a steam stop valve and a bypass valve closed; during the no-load operation step, a pressure accumulating step in which steam is accumulated in a pressure accumulation region; and, after the pressure accumulating step, an intermittent blowing step in which the bypass valve is opened, and steam in the pressure accumulation region is allowed to flow into a condenser. The commissioning processing step includes: a commissioning step in which the gas turbine is commissioned with the steam stop valve closed and the bypass valve open; and a continuous blowing step in which steam from a waste heat recovery boiler is allowed to flow into the condenser.

Method for cleaning steam system of combined cycle plant

A steam turbine plant and an operating method thereof, and a combined cycle plant and an operating method thereof, include: a turbine; steam supply lines that supply main steam to the turbine; a steam control valve and an intercept valve provided to the steam supply lines; and a first auxiliary steam supply line that supplies auxiliary steam to the turbine via the steam supply lines which are located farther downstream than the steam control valve and the intercept valve.

Steam turbine plant and operation method, combined cycle plant and operation method

This steam turbine plant comprises: a boiler; a steam turbine; a condenser; a condensate pump; a main steam line that is capable of guiding, to the steam turbine, steam generated in the boiler; a bypass line that is branched from the main steam line and is connected to the condenser; a condensate line that is capable of guiding, to the condensate pump, water in the condenser; a condensate outlet valve that is provided in the condensate line; a water supply line that is capable of guiding, to the boiler, water having a pressure which has been increased in the condensate pump; a first connection unit that is, in the condensate line, branched from a position which is closer to the condenser than the condensate outlet valve is; and a second connection unit that is, in the condensate line, branched from a position which is closer to the condensate pump than the condensate outlet valve is. The first connection unit has a first connection seating that is connectable with a first line. The second connection unit has a second connection seating that is connectable with a second line.

Steam turbine plant and method for cleaning same

A steam turbine plant is provided with: a boiler; a fuel valve; a low-temperature steam generation source; a steam turbine; a main steam line that guides steam generated in the boiler to the steam turbine; a main steam adjustment valve that is provided to the main steam line; a low-temperature steam line that guides low-temperature steam from the low-temperature generation source to a position closer to the steam turbine-side than the main steam adjustment valve in the main steam line; a low-temperature steam valve provided to the low-temperature steam line; and a control device. During a stopping process of the steam turbine plant, the control device sends a command to close the fuel valve, and then sends a command to open the low-temperature steam valve.

Steam turbine plant and cooling method for same

In a combined cycle plant and a method for operating the same, the combined cycle plant is provided with a gas turbine, a waste heat recovery boiler, and a steam turbine, and is also provided with a low-pressure gland steam line for supplying steam to a low-pressure gland portion of a low-pressure turbine, and a first heat exchanging unit which performs heat exchange between gland steam flowing through the low-pressure gland steam line, and fuel gas to be supplied to a combustor.

Combined cycle plant and method for operating same

A control device includes a mode-recognizing unit that recognizes whether a start mode of a steam turbine is a cold mode in which a temperature of a steam contact portion of the steam turbine is lower than a predetermined temperature or a different start mode in which the temperature of the steam contact portion is equal to or higher than the predetermined temperature, a first opening generator that generates a first degree of opening greater than a second degree of opening in the different start mode as a degree of opening of an intake air regulator of a compressor in a period after generation of steam from an exhaust heat recovery boiler is started and before supplying of the steam to the steam turbine is started, and a command output unit that outputs a command corresponding to the first degree of opening to the intake air regulator.

Combined cycle plant, control method of same, and control device of same

A piping system of a steam turbine plant is provided with: steam piping connected to a steam turbine; bypass piping which branches from the steam piping at a branching portion and which is connected to a condenser; a steam check valve provided between the branching portion of the steam piping and the steam turbine; and a turbine bypass valve provided in the bypass piping. A piping system cleaning method includes the steps of: connecting at least one valve of the steam check valve and the turbine bypass valve and a connecting portion provided between the turbine bypass valve of the bypass piping and the condenser, by using temporary piping having a foreign matter collecting portion; closing a flow path on the outlet side of the valve; cleaning the steam piping by supplying steam to the steam piping; and sending the steam to the condenser through the temporary piping.

Piping system cleaning method, piping system, and steam turbine plant

A piping system of a steam turbine plant includes: a piping member including a first pipe section including a first passage, a second pipe section including a second passage, a connection section arranged between the first pipe section and the second pipe section and including a connection passage that connects the first passage and the second passage, and a third pipe section including a third passage connected with the connection passage through an opening, the first pipe section being supplied with steam; a steam stop valve connected with the third pipe section; and a turbine bypass valve connected with the second pipe section. An angle made by a first central axis and a second central axis is larger than an angle made by the first central axis and a third central axis.

Growing community of inventors

Kanagawa, Japan

Daiki Fujimura