Power plant with CO
View Patent ↗A power plant frequency response characteristic is implemented by controlling the power consumption of a CO 2 capture and compression system. A power reserve is provided for under-frequency events without deloading the plant to part load, by an operating method, in which the power consumption of the CO 2 capture system is used to control the net output of the plant.
1. A method for operating a power plant, comprising:
operating a plant via a control system and CO 2 capture system; and
using a power consumption of the CO 2 capture system as a control parameter for controlling a net power output during an under-frequency event.
2. A method according to claim 1 , comprising:
operating the CO 2 capture system at reduced capacity or shutting down the CO 2 capture system in order to supply additional power to the grid; and
using the additional power to meet frequency response requirements of a power grid during an under-frequency event.
3. A method according to claim 1 , comprising:
operating the power plant close to or at base load when the CO 2 capture system is in operation; and
making the power consumption of the CO 2 capture system available for frequency response of the plant.
4. A method according to claim 1 , comprising:
varying the CO 2 capture rate to control the power consumption of the CO 2 capture system during an under-frequency event.
5. A method according to claim 1 , wherein the CO 2 capture system includes a CO 2 compression unit, the method comprising:
shutting down the CO 2 compression unit or operating the CO 2 compression unit at reduced capacity during an under-frequency event.
6. A method according to claim 5 , comprising:
releasing that part or all of the captured CO 2 via a bypass of the CO 2 compression unit during an under-frequency event.
7. A method according to claim 1 , wherein the CO 2 capture system includes a regeneration unit, the method comprising:
shutting down the regeneration unit or operating the regeneration unit at reduced capacity during an under-frequency event.
8. A method according to claim 1 , wherein the CO 2 capture system includes an absorption or adsorption unit, the method comprising:
shutting down the absorption or adsorption unit or operating the absorption or adsorption unit at reduced capacity during an under-frequency event.
9. A method according to claim 8 , comprising:
bypassing at least part of the flue gas around the capture equipment during an under-frequency event.
10. A method according to claim 7 , comprising:
reducing steam consumption of the regeneration unit in the capture system due to the shut down or operation at reduced capacity; and
feeding surplus steam to an existing steam turbine of the plant for additional power generation during an under-frequency event.
11. A method according to claim 10 , comprising:
using a stored absorbent or adsorbent for CO 2 capture during an under-frequency event when regeneration is shut down or regeneration of absorbent or adsorbent takes place at a reduced capacity during the under-frequency event.
12. A method according to claim 1 , comprising:
controlling the CO 2 capture system by a closed loop control system, which is integrated into the plant control system or coordinated by the plant control system or has a direct data link to the plant control system.
13. A power plant comprising:
a CO 2 capture system; and
a control system configured to control a net power output during an under-frequency event by employing a power consumption of the CO 2 capture system as a control parameter.
14. A power plant according to claim 13 , comprising:
at least one steam turbine for converting a maximum steam flow into energy, which can be produced by the plant with the CO 2 capture system switched off.
15. A power plant according to claim 13 , comprising:
at least one generator and electrical system for converting a maximum power, which is produced with the CO 2 capture system off, into electrical power and to transmit this electric power to a grid.
16. A power plant according to claim 13 , comprising:
at least one of a bypass of the CO 2 compression unit and an absorption unit.
17. A power plant according to claim 16 , wherein the absorption unit is configured to withstand the flue gases even when it is not in operation.
18. A power plant according to claim 14 , comprising:
at least one generator and electrical system for converting a maximum power, which is produced with the CO 2 capture system off, into electrical power and to transmit this electric power to a grid.
19. A power plant according to claim 14 , comprising:
at least one of a bypass of the CO 2 compression unit and an absorption unit.
20. A power plant according to claim 14 , wherein the absorption unit is configured to withstand the flue gases even when it is not in operation.