CO2 compression is a main step in carbon capture and storage, which is essential to control global warming. CO2 compressors are powered by electric motors, which increase operational flexibility but require much energy leading to additional expenses, power and efficiency losses. A method is provided
CO2 compression is a main step in carbon capture and storage, which is essential to control global warming. CO2 compressors are powered by electric motors, which increase operational flexibility but require much energy leading to additional expenses, power and efficiency losses. A method is provided for optimized operation of a plant including a power generation unit with a CO2 capture system and compressor with minimum losses during normal operation, allowing flexible part load. The method allows steam from the power unit to drive a steam turbine, which drives the CO2 compressor via an engaged overrunning clutch if a sufficient amount of steam is available from the power unit, and to drive it by the generator, which is used as motor when insufficient steam is available from the power unit. When no or insufficient steam is available the clutch is disengaged and the steam turbine may be at standstill or idling.
대표청구항▼
1. A power plant comprising a power unit with a CO2 capture system and a CO2 compressor arranged downstream of the CO2 capture system, and a steam turbine powered by a live steam line fed by the power unit, the steam turbine engageably connected to a generator and the CO2 compressor via an overrunni
1. A power plant comprising a power unit with a CO2 capture system and a CO2 compressor arranged downstream of the CO2 capture system, and a steam turbine powered by a live steam line fed by the power unit, the steam turbine engageably connected to a generator and the CO2 compressor via an overrunning clutch, wherein the generator is connectable to a power grid to deliver power to the grid and operable as a motor, and wherein the generator is connected to the CO2 compressor with no interposed coupling. 2. The power plant according to claim 1, wherein a gear is arranged between the CO2 compressor and the generator. 3. The power plant according to claim 1, wherein the generator is a generator with a matrix converter or a combination of generator and a frequency converter to allow grid connection of the generator independent of the operating speed of the CO2 compressor. 4. The power plant according to claim 1, wherein the power unit is a combined cycle power plant comprising a gas turbine, a heat recovery steam generator, a steam turbine and a CO2 capture system. 5. The power plant according to claim 4, wherein a flue gas recirculation flow is recirculated into inlet air of a gas turbine of the combined cycle power plant. 6. The power plant according to claim 1, further comprising a plurality of power generating units and a plurality of CO2 compressors, which are connected by a CO2 manifold. 7. The power plant according to claim 1, wherein the CO2 compressor's design operating speed is different from the grid frequency. 8. A method for operating a power plant comprising a carbon dioxide (CO2) capture system, a generator, a steam turbine powered by a live steam fed by the power plant and a CO2 compressor arranged downstream of the CO2 capture system, the method comprising: operating the generator, for CO2 compression, as a motor to drive the CO2 compressor when insufficient steam to drive the steam turbine is available, the generator being mechanically connected to the CO2 compressor with no interposed coupling; anddriving the CO2 compressor, by the steam turbine, via an overrunning clutch, which engages when sufficient steam is available;wherein during normal steady state high part load and/or base load operation of the plant, the steam turbine is engaged via the overrunning clutch to the generator and the CO2 compressor, and the CO2 compressor is driven by the steam turbine. 9. The method for operating a power plant according to claim 8, wherein the steam turbine, which is driving the CO2 compressor, also drives the generator at the same time as the CO2 compressor and electric power is fed into the grid when the power of the turbine exceeds the power required to drive the CO2 compressor. 10. The method for operating a power plant according to claim 8, wherein during low part load operation and/or loading of the power unit or when no steam is available due to phased construction or an outage of the steam part of a combined cycle power plant, the steam turbine is not engaged via the overrunning clutch and the CO2 compressor is driven by the generator, which is operated as motor during this operating mode. 11. The method for operating a power plant according to claim 8, wherein the steam turbine is engaged with the generator and CO2 compressor via the overrunning clutch, the generator is operated as a motor, and both the steam turbine and the generator drive the CO2 compressor when steam is available but the power output of the steam turbine is less than the power required to drive the CO2 compressor. 12. The method for operating a power plant according to claim 8, wherein CO2 captured from a plurality of power units is collected by a CO2 manifold, and is compressed by a plurality of CO2 compressors. 13. The method for operating a power plant according to claim 12, wherein for part load operation the load reduction of the power plant is realized by deloading the power units to different load levels and deloading the CO2 compressors to equally distribute the CO2 mass flows over all operating CO2 compressors. 14. The method for operating a power plant according to claim 8, wherein at least one CO2 compressor is driven either by the generator and/or the steam turbine and the speed of the CO2 compressor is variably adjusted to control the CO2 flow and/or that at least one generator is configured as a generator with a matrix converter to allow grid connection independent of the operating speed or connected to the grid via a frequency converter.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (23)
Farr James B. (Ann Arbor MI), Alternator-compressor construction.
Markbreiter Stephen J. (Edison NJ) Dessanti Daniel J. (Teaneck NJ) Schorr Hans P. (Douglaston NY), Cogeneration of electricity and liquid carbon dioxide by combustion of methane-rich gas.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.