Combined cycle plant including chilled ammonia based CO
View Patent ↗A power plant includes a gas turbine unit adapted to feed flue gases into a boiler of a steam turbine unit, to be then diverted into a recirculated flow and discharged flow. The recirculated flow is mixed with fresh air forming a mixture that is fed into a gas turbine unit compressor. The discharged flow is fed into a CO 2 capture unit that is an amine based or chilled ammonia based CO 2 capture unit. A cooler for the flue gases can be configured as a shower cooler located upstream of the CO 2 capture unit. The plant can also include a washing unit to neutralize ammonia drawn by the flue gases that can be fed with nitric acid gathered at the cooler.
1. A power plant, comprising:
a gas turbine unit adapted to feed flue gases into a boiler of a steam turbine unit, to be then diverted into a recirculated flow that is mixed with fresh air forming a mixture that is fed into a gas turbine unit compressor and a discharged flow that is fed into a CO 2 capture unit, the CO 2 capture unit being an amine based or chilled ammonia based CO 2 capture unit;
a cooler for the flue gases, the cooler being a shower cooler located upstream of the CO 2 capture unit; and
wherein the CO 2 capture unit is a chilled ammonia based capture plant comprising a washing unit to neutralize ammonia drawn by the flue gases, wherein the washing unit is fed with nitric acid gathered at the cooler.
2. The power plant of claim 1 , wherein an oxidizer is provided to the flue gases upstream of and/or within the cooler.
3. The power plant of claim 1 , wherein the cooler is provided downstream of the boiler and upstream of a diverter that diverts the flue gases into the recirculated flow and the discharged flow.
4. The power plant of claim 1 , wherein the boiler is a reheat boiler.
5. The power plant of claim 1 , wherein the cooler is upstream of a diverter that diverts the flue gases into the recirculated flow and the discharged flow.
6. The power plant of claim 5 , comprising:
an oxidizer that is positioned between the boiler and the cooler.
7. The power plant of claim 5 , comprising a liquid oxidizer positioned at a top of the cooler.
8. The power plant of claim 1 , wherein the cooler is configured such that flue gases rise from a bottom of a casing of the cooler and a cooling liquid falls from a top of the casing of the cooler.
9. A method for operating a power plant comprising a gas turbine unit adapted to feed flue gases into a boiler of a steam turbine unit, the method comprising:
diverting the flue gases into a recirculated flow and a discharged flow,
mixing the recirculated flow with fresh air forming a mixture,
feeding the mixture into a gas turbine unit compressor,
feeding the discharged flow into a CO 2 capture unit,
operating the CO 2 capture unit as an amine based or chilled ammonia based CO 2 capture unit, wherein the CO 2 capture unit is a chilled ammonia based capture plant comprising a washing unit to neutralize ammonia drawn by the flue gases,
cooling the flue gases in a cooler, the cooler being a shower cooler located upstream of the CO 2 capture unit, and
feeding the washing unit with nitric acid gathered at the cooler.
10. The method of claim 9 , wherein the cooler is upstream of a diverter that diverts the flue gases into the recirculated flow and the discharged flow.
11. The method of claim 9 , comprising:
providing an oxidizer between the boiler and the cooler.
12. The method of claim 9 , comprising:
providing a liquid oxidizer positioned at a top of the cooler.
13. The method of claim 9 , wherein the cooler is configured such that flue gases rise from a bottom of a casing of the cooler and a cooling liquid falls from a top of the casing of the cooler.
14. The method of claim 9 , further comprising providing an oxidizer to the flue gases upstream of and/or within the cooler.