Method for operating a combined plant
AssigneeHitachi, Ltd.
InventorTetsuzo Kuribayashi
Life of this patent
Estimating the term…
Abstract
A method of operating a combined plant made up of a gas turbine plant and a steam turbine plant utilizing the exhaust heat of the gas turbine as its power source; in which, after the steam turbine has been stopped and before it is started, the gas turbine is kept running at a low constant load for a certain period of time with the exhaust gas from the gas turbine being led partly to a by-pass duct and partly to a heat recovery boiler, during which time necessary operations to start or stop the combined plant (such as breaking the vacuum in the condenser) are performed.
Claims8
In a combined steam and gas turbine plant consisting of a gas turbine plant, a heat recovery boiler generating steam by the exhaust gas from the gas turbine plant and incorporating a denitrating means for reducing the amount of nitrogen oxide (NOx) discharged into the atmosphere, and a steam turbine plant driven by the steam generated by the heat recovery boiler;
- a method of operating the combined plant comprising the steps of:
- starting the gas turbine plant and running it at a low constant load;
- introducing the exhaust gas from the gas turbine to the heat recovery boiler to generate steam during the low load operation of the gas turbine plant;
- sealing the glands of the steam turbine by supplying the steam from the heat recovery boiler to the glands;
- and starting the steam turbine.
In a combined steam and gas turbine plant consisting of a gas turbine plant, a heat recovery boiler generating steam by the exhaust gas from the gas turbine plant and incorporating a denitrating means for reducing the amount of nitrogen oxide (NOx) discharged into the atmosphere, and a steam turbine plant driven by the steam generated by the heat recovery boiler;
- a method of operating the combined plant comprising the steps of:
- stopping the steam turbine;
- keeping the gas turbine running at a low constant load for a certain period of time;
- introducing the exhaust gas from the gas turbine to the heat recovery boiler to generate steam during the low load operation of the gas turbine plant;
- and sealing the glands of the steam turbine by supplying the steam from the heat recovery boiler to the glands.
In a combined steam and gas turbine plant consisting of a gas turbine plant, a heat recovery boiler generating steam by the exhaust gas from the gas turbine plant and incorporating a denitrating means for reducing the amount of nitrogen oxide (NOx) discharged into the atmosphere, and a steam turbine plant driven by the steam generated by the heat recovery boiler;
- a method of operating the combined plant comprising the steps of:
- running the gas turbine plant at a low constant load after the steam turbine has been stopped and before the steam turbine is started;
- introducing the exhaust gas from the gas turbine to the heat recovery boiler to generate steam during the low load operation of the gas turbine;
- and sealing the glands of the steam turbine by supplying the steam from the heat recovery boiler to the glands.
Dependencies are inferred from the claim text.