초록 ▼

A novel power generation system, more specifically an integrated power generation and air separation system and an integrated power generation and air separation process is provided. A key component of the system and process is an oxygen-fired combustor designed for gas turbine operating pressures.

A novel power generation system, more specifically an integrated power generation and air separation system and an integrated power generation and air separation process is provided. A key component of the system and process is an oxygen-fired combustor designed for gas turbine operating pressures. The combustor produces a high-temperature gas stream that enters one or more heat exchangers to generate/heat steam, and then enters one or more turbines to generate power. The steam from the heat exchanger drives one or more steam turbines to generate power, and the discharged steam is admitted to the combustor. To maximize cycle efficiency, steam extraction and reheat is incorporated in the process. Additional power is generated from a high-pressure nitrogen stream produced by an air separation unit (ASU). This process has the potential to attain high cycle efficiencies with zero emissions, while utilizing existing or near-term steam turbines, and moderate-pressure combustion systems.

대표청구항 ▼

1. An integrated power generation and air separation system comprising:(a) a power generation system comprising at least one oxygen-fired combustor designed for gas turbine operating pressures; at least one main heat exchanger which generates steam; one or more steam turbine(s), including at least o

1. An integrated power generation and air separation system comprising:(a) a power generation system comprising at least one oxygen-fired combustor designed for gas turbine operating pressures; at least one main heat exchanger which generates steam; one or more steam turbine(s), including at least one high-pressure steam turbine, for generating power; means for sending oxygen and fuel to the combustor(s); means for sending combustion gases from the combustor(s) to the main heat exchanger(s); means for sending steam generated by the main heat exchanger(s) to the turbine(s); and means for sending steam discharged from at least one steam turbine to the combustor(s); (b) an air separation system comprising at least one air separation unit which comprises at least one device for separating air into oxygen-enriched and nitrogen-enriched streams, at least one nitrogen gas compressor, at least one heater for compressed nitrogen gas, at least one nitrogen gas turbine for generating power; means for sending nitrogen to the nitrogen gas compressor(s); means for sending compressed nitrogen from the compressor(s) to the heater(s); means for sending nitrogen gas from the heater(s) to the nitrogen gas turbine(s); (c) a combustion gas power system comprising at least one intermediate-pressure turbine for generating power from the heated combustion gases; means for sending combustion gases from the main heat exchanger(s) to said turbine(s), means for extracting combustion gases from at least one turbine; (d) a feedwater regeneration system comprising at least one feedwater heater for the main heat exchanger(s) and at least one feedwater heater capable of receiving combustion gases extracted from the turbine(s) and of removing non-condensable gases from the turbine(s); and means for sending steam from the high-pressure steam turbine(s) to the feedwater heater(s) to provide feedwater heating. 2. A system as claimed in claim 1, further comprising one or more low-pressure turbines and means for sending combustion gases from the intermediate-pressure turbine(s) to the low-pressure turbine(s).3. A system as claimed in claim 1, further comprising means for sending steam from the high-pressure steam turbine(s), to the feedwater heater(s) to provide feedwater heating.4. A system as claimed in claim 1, wherein said feedwater regeneration system further comprises at least one feedwater heat exchanger and means for sending the nitrogen discharge from the nitrogen gas turbine(s) to the feedwater heat exchanger(s) to provide feedwater heating.5. A system as claimed in claim 1, wherein said feedwater regeneration system further comprises at least one feedwater heat exchanger and means for sending the nitrogen discharge from the nitrogen gas turbine(s) to the feedwater heat exchanger(s) to provide feedwater heating.6. A system as claimed in claim 1, wherein said means for sending steam from the high-pressure steam turbine(s) to the feedwater heater(s) comprises one or more extractions of steam from the turbine(s) to reduce the flowrate of non-condensable gases through the turbine(s).7. A system as claimed in claim 3, wherein said means for sending steam from the high-pressure steam turbine(s), to the feedwater heater(s) comprises one or more extractions of steam from the turbine(s) to reduce the flowrate of non-condensable gases through the turbine(s).8. A system as claimed in claim 1, further comprising at least one reheater for the high-pressure steam turbine(s), means for sending steam from the turbine(s) to the reheater(s) and means for returning heated steam discharge from the reheater(s) to the turbine(s).9. A system as claimed in claim 1, further comprising at least one reheater for heating exhaust from the high-pressure steam turbine(s), means for sending steam from the high-pressure steam turbine(s) to the reheater(s) and means for returning heated discharge from the reheater(s) to feed further steam turbine(s).10. A system as claimed in claim 1, wherein the air separation unit(s) produce an oxygen-enriched stream and a nitrogen-enriched stream.11. A system as claimed in claim 10, wherein said oxygen-enriched stream from at least one air separation unit is supplied to the oxygen-fired combustor(s).12. A system as claimed in claim 10, wherein said nitrogen-enriched stream from at least one air separation unit(s) is supplied to the nitrogen gas compressor(s).13. A system as claimed in claim 12, wherein said nitrogen-enriched stream is heated in said main heat exchanger(s.14. A system as claimed in claim 1, wherein the steam produced by the main heat exchanger(s) is high purity steam.15. An integrated power generation and air separation process, comprising:(a) introducing an oxygen-enriched stream and fuel into at least one combustor designed for gas turbine operating pressures; (b) sending the discharge from the combustor(s) to at least one main heat exchanger which generates steam; (c) generating steam in the main heat exchanger(s); (d) sending the steam to one or more steam turbine(s), including at least one high-pressure steam turbine, to generate power; (e) sending steam discharged from at least one steam turbine to the combustor(s); (f) introducing air into at least one air separation unit, (g) separating the air into an oxygen-enriched stream and a nitrogen-enriched stream; (h) feeding the nitrogen-enriched stream to at least one nitrogen gas compressor; (i) heating the compressed nitrogen-enriched stream; (j) passing the compressed nitrogen-enriched stream through at least one nitrogen gas turbine to generate power; (k) sending heated combustion gases discharged from one or more main heat exchanger(s) to at least one intermediate-pressure turbine to generate power; (l) extracting combustion gases from at least one turbine; (m) heating feedwater to said main heat exchanger(s) in a feedwater regeneration system comprising at least one feedwater heater for the main heat exchanger(s) and at least one feedwater heater capable of receiving combustion gases extracted from the turbine(s) and of removing non-condensable gases from the turbine(s); (n) sending steam from the high-pressure steam turbine(s) to the feedwater heater(s) to provide feedwater heating. 16. A process as claimed in claim 15, further comprising sending combustion gases from the intermediate-pressure turbines to one or more low-pressure turbines to generate power.17. A process as claimed in claim 16, further comprising heating feedwater to said main heat exchanger(s) in at least one feedwater heater using combustion gas as a heat source.18. A process as claimed in claim 17, further comprising sending steam from the high-pressure steam turbine(s), to the feedwater heater(s) to provide feedwater heating.19. A process as claimed in claim 15, further comprising heating said feedwater in at least one feedwater heat exchanger and sending the nitrogen discharge from the nitrogen gas turbine(s) to the feedwater heat exchanger(s) to provide feedwater heating.20. A process as claimed in claim 17, further comprising heating said feedwater in at least one feedwater heat exchanger and sending the nitrogen discharge from the nitrogen gas turbine(s) to the feedwater heat exchanger(s) to provide feedwater heating.21. A process as claimed in claim 15, wherein one or more extractions of steam from the high-pressure steam turbine(s) is employed to reduce the flowrate of non-condensable gases through the turbine(s).22. A process as claimed in claim 18, wherein one or more extractions of steam from the high-pressure steam turbine(s) is employed to reduce the flowrate of non-condensable gases through the turbine(s).23. A process as claimed in claim 15, further comprising sending steam from the high-pressure steam turbine(s) to at least one reheater for the high-pressure steam turbine(s), heating the steam, and returning heated team discharge from the reheater(s) to the turbine(s).24. A process as claimed in claim 16, further comprising sending combustion gases exhausted from at least one intermediate pressure turbine to at least one reheater, heating the combustion gases, and returning heated discharge from the reheater(s) to at least one low-pressure turbine.25. A process as claimed in claim 15, wherein said oxygen-enriched stream is supplied to the oxygen-fired combustor(s).26. A process as claimed in claim 15, wherein said compressed nitrogen-enriched stream is heated in said main heat exchanger(s).27. A process as claimed in claim 15, wherein the steam produced by the main heat exchanger(s) is high purity steam.28. A system as claimed in claim 1, further comprising a means for sending the oxygen-enriched stream to said oxygen-fired combustor(s).29. A process as claimed in claim 15, further comprising feeding the oxygen-enriched stream to said oxygen-fired combustor(s).30. A system as claimed in claim 1, further comprising at least one feedwater heater using combustion gas as a heat source.31. A system as claimed in claim 30, further comprising means for sending combustion gases from one or more turbine(s) to the feedwater heater(s) to provide feedwater heating.32. A system as claimed in claim 2, further comprising at least one reheater for heating combustion gases from one or more intermediate-pressure turbine(s), means for sending interstage combustion gases from said turbine(s) to the reheater(s) and means for returning heated combustion gases from the reheater(s) to feed further turbine(s).33. A system as claimed in claim 9, further comprising one or more reheater(s) for heating the interstage stream(s) associated with at least two steam turbines.34. A process as claimed in claim 16, wherein one or more extractions of combustion gases from at least one turbine is employed to reduce the flowrate of non-condensable gases through the turbine(s).35. A process as claimed in claim 16, further comprising sending combustion gases from one or more combustion gas turbine(s) to the feedwater heater(s) to provide feedwater heating.36. A process as claimed in claim 18, wherein one or more extractions of steam from the steam turbine(s) is employed to reduce the flowrate of non-condensable gases through the turbine(s).37. A system as claimed in claim 1, wherein the compressed nitrogen-enriched stream is heated in a separately-fired heater.38. A system as claimed in claim 1, wherein the compressed nitrogen-enriched stream is heated in a direct-fired oxygen-fuel combustor.39. A process as claimed in claim 15, wherein the compressed nitrogen-enriched stream is heated in a separately-fired heater.40. A process as claimed in claim 15, wherein the compressed nitrogen-enriched stream is heated in a direct-fired oxygen-fuel combustor.