Gas turbine plant operation method and gas turbine plant
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MITSUBISHI HEAVY IND LTD
- Filing Date
- 2022-09-14
- Publication Date
- 2026-06-12
AI Technical Summary
【0010】 本開示の少なくとも一実施形態によれば、ガスタービンプラントにおいてガスタービンの運転を継続したままコンバインドサイクル運転とシンプルサイクル運転とを切り替えることができる。
Smart Images
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Abstract
Claims
1. A method for operating a gas turbine plant comprising a gas turbine and a heat recovery boiler that generates steam by exchanging heat between exhaust gas discharged from the gas turbine and water, The aforementioned gas turbine plant is A compressed air cooling line is provided, which is connected in parallel to an air cooling line equipped with an air cooler for cooling compressed air extracted from the air compressor of the gas turbine with outside air, and a water cooling line equipped with a water cooler for cooling the compressed air with a first feedwater from a heat recovery boiler. A fuel heating line comprising a first heating line equipped with a first preheater for heating the fuel supplied to the combustor of the gas turbine with outside air heated by heat exchange with the compressed air in the air cooler, and a second heating line equipped with a second preheater for heating the fuel with second feedwater from the waste heat recovery boiler, all connected in parallel, Equipped with, When transitioning from a second operating state in which the compressed air is cooled by the water cooler without being cooled by the air cooler, and the fuel is heated by the second preheater without being heated by the first preheater, to a first operating state in which the compressed air is cooled by the air cooler without being cooled by the water cooler, and the fuel is heated by the first preheater without being heated by the second preheater, The steps include opening the air cooler inlet valve provided in the air cooling line upstream of the air cooler and opening the drain valve provided in the air cooling line downstream of the air cooler, thereby allowing a portion of the compressed air flowing through the compressed air cooling line to flow to the air cooler and preheating the air cooler, After performing the step of preheating the air cooler, the drain valve is closed and the air cooler outlet valve provided in the air cooling line downstream of the air cooler is opened to cool the compressed air with the water cooler and the air cooler. After performing the step of cooling the compressed air with the water cooler and the air cooler, the first preheater inlet valve provided in the first heating line upstream of the first preheater and the first preheater outlet valve provided in the first heating line downstream of the first preheater are partially opened to allow a portion of the fuel flowing through the fuel heating line to flow to the first preheater and preheat the first preheater, After performing the step of preheating the first preheater, the fuel is heated in the second preheater and the first preheater by increasing the opening of the first preheater inlet valve and the first preheater outlet valve, After performing the step of cooling the compressed air with the water cooler and the air cooler, the step of cooling the compressed air with the air cooler without cooling it with the water cooler is performed by closing the water cooler inlet valve provided in the water cooling line upstream of the water cooler and the water cooler outlet valve provided in the water cooling line downstream of the water cooler. After performing the step of heating the fuel in the second preheater and the first preheater, the second preheater inlet valve provided in the second heating line upstream of the second preheater and the second preheater outlet valve provided in the second heating line downstream of the second preheater are closed, thereby heating the fuel in the first preheater without heating it in the second preheater. Execute Operation methods for gas turbine plants.
2. In the step of cooling the compressed air with the water cooler and the air cooler, the temperature of the compressed air after it has passed through the compressed air cooling line is adjusted by circulating a portion of the compressed air flowing through the compressed air cooling line via a compressed air bypass line connected in parallel with the air cooling line and the water cooling line. A method for operating a gas turbine plant according to claim 1.
3. In the step of heating the fuel in the second preheater and the first preheater, the temperature of the fuel after it has passed through the fuel heating line is adjusted by circulating a portion of the fuel flowing through the fuel heating line via a fuel bypass line connected in parallel with the first heating line and the second heating line. A method for operating a gas turbine plant according to claim 1 or 2.
4. The air cooler inlet valve includes a parent valve and a child valve connected in parallel. In the step of preheating the air cooler, the parent valve and the parent valve are closed, then the parent valve is opened to increase the pressure in the air cooling line, and then the parent valve is opened. A method for operating a gas turbine plant according to claim 1 or 2.
5. The second feedwater is feedwater obtained by heating the drum water in the low-pressure drum of the heat recovery boiler in the medium-pressure economizer of the heat recovery boiler. A method for operating a gas turbine plant according to claim 1 or 2.
6. When transitioning from the second operating state to the first operating state, After performing the step of cooling the compressed air with the air cooler without cooling it with the water cooler, the step of stopping the supply of the first water to the water cooler, After performing the step of heating the fuel in the first preheater without heating it in the second preheater, the step of stopping the supply of the second feedwater to the second preheater, Execute A method for operating a gas turbine plant according to claim 1 or 2.
7. A method for operating a gas turbine plant comprising a gas turbine and a heat recovery boiler that generates steam by exchanging heat between exhaust gas discharged from the gas turbine and water, The aforementioned gas turbine plant is A compressed air cooling line is provided, which is connected in parallel to an air cooling line equipped with an air cooler for cooling compressed air extracted from the air compressor of the gas turbine with outside air, and a water cooling line equipped with a water cooler for cooling the compressed air with a first feedwater from a heat recovery boiler. A fuel heating line comprising a first heating line equipped with a first preheater for heating the fuel supplied to the combustor of the gas turbine with outside air heated by heat exchange with the compressed air in the air cooler, and a second heating line equipped with a second preheater for heating the fuel with second feedwater from the waste heat recovery boiler, all connected in parallel, Equipped with, When transitioning from a first operating state in which the compressed air is cooled by the air cooler without being cooled by the water cooler, and the fuel is heated by the first preheater without being heated by the second preheater, to a second operating state in which the compressed air is cooled by the water cooler without being cooled by the air cooler, and the fuel is heated by the second preheater without being heated by the first preheater, The steps include: starting the supply of the first water to the water cooler, The steps include: starting the supply of the second water to the second preheater, After performing the step of starting the supply of the first water to the water cooler, the water cooler inlet valve provided in the water cooling line on the upstream side of the water cooler and the drain valve provided in the water cooling line on the downstream side of the water cooler are opened to allow a portion of the compressed air flowing through the compressed air cooling line to flow to the water cooler and preheat the water cooler. After performing the step of preheating the water cooler, the drain valve is closed and the water cooler outlet valve provided in the water cooling line downstream of the water cooler is opened to cool the compressed air with the water cooler and the air cooler. After performing the step of starting the supply of the second water to the second preheater, the second preheater inlet valve provided in the second heating line upstream of the second preheater and the second preheater outlet valve provided in the second heating line downstream of the second preheater are partially opened to allow a portion of the fuel flowing through the fuel heating line to flow to the second preheater and preheat the second preheater, After performing the step of preheating the second preheater, the fuel is heated in the second preheater and the first preheater by increasing the opening of the second preheater inlet valve and the second preheater outlet valve, After performing the step of cooling the compressed air with the water cooler and the air cooler, the step of cooling the compressed air with the water cooler without cooling it with the air cooler is performed by closing the air cooler inlet valve provided in the air cooling line upstream of the air cooler and the air cooler outlet valve provided in the air cooling line downstream of the air cooler. After performing the step of heating the fuel in the second preheater and the first preheater, the first preheater inlet valve provided in the first heating line upstream of the first preheater and the first preheater outlet valve provided in the first heating line downstream of the first preheater are closed, thereby heating the fuel in the second preheater without heating it in the first preheater. Execute Operation methods for gas turbine plants.
8. A gas turbine plant comprising a gas turbine and a heat recovery boiler that generates steam by exchanging heat between exhaust gas discharged from the gas turbine and water, A compressed air cooling line for cooling compressed air extracted from the air compressor of the aforementioned gas turbine, A fuel heating line for heating the fuel supplied to the combustor of the gas turbine, Equipped with, The compressed air cooling line is An air cooling line equipped with an air cooler for cooling the compressed air with outside air, A water cooling line is provided which includes a water cooler for cooling the compressed air with a first feedwater from a heat recovery boiler, Compressed air bypass line and They are connected in parallel, The aforementioned fuel heating line is A first heating line comprising a first preheater for heating the fuel with the outside air that has been heated by heat exchange with the compressed air in the air cooler, A second heating line comprising a second preheater for heating the aforementioned fuel with a second feedwater from the aforementioned heat recovery boiler, Fuel bypass line and They are connected in parallel. Gas turbine plant.