Partial oxidation reaction with closed cycle quench

Patent metadata

Field	Value
Publication number	US-9581082-B2
Application number	US-201414302644-A
Country	US
Kind code	B2
Filing date	Jun 12, 2014
Priority date	Feb 11, 2012
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

The present disclosure relates to a power production system that is adapted to achieve high efficiency power production with complete carbon capture when using a solid or liquid hydrocarbon or carbonaceous fuel. More particularly, the solid or liquid fuel first is partially oxidized in a partial oxidation reactor. The resulting partially oxidized stream that comprises a fuel gas is quenched, filtered, cooled, and then directed to a combustor of a power production system as the combustion fuel. The partially oxidized stream is combined with a compressed recycle CO 2 stream and oxygen. The combustion stream is expanded across a turbine to produce power and passed through a recuperator heat exchanger. The expanded and cooled exhaust stream is scrubbed to provide the recycle CO 2 stream, which is compressed and passed through the recuperator heat exchanger and the POX heat exchanger in a manner useful to provide increased efficiency to the combined systems.

First claim

The invention claimed is:

1. A process for the production of power using a combination of a partial oxidation (POX) system and a power production system (PPS), the process comprising:
combining a solid or liquid carbonaceous fuel and oxygen in a POX reactor under conditions sufficient to partially oxidize the solid or liquid carbonaceous fuel and form a POX stream at a first temperature comprising a fuel gas;
cooling the POX stream to a second temperature that is less than the first temperature and thus form a cooled POX stream;
removing at least a portion of any solids present in the POX stream;
separating at least a portion of any water present in the POX stream;
compressing the POX stream to a pressure suitable for combustion in a PPS combustor;
combusting the fuel gas in the POX stream in the PPS combustor to form a PPS combustion product stream;
expanding the PPS combustion product stream across a PPS turbine to generate power and form an expanded PPS combustion product stream;
passing the expanded PPS combustion product stream through a PPS recuperator heat exchanger and thereby withdrawing heat from the PPS combustion product stream and forming a cooled PPS combustion product stream;
removing at least a portion of one or more impurities from the cooled PPS combustion product stream to form a recycle CO 2 stream; and
pressurizing the recycle CO 2 stream in a PPS compressor to form a compressed recycle CO 2 stream.

2. The process according to claim 1 , wherein said cooling the POX stream comprises quenching the POX stream through combination with a quenching fluid.

3. The process according to claim 2 , wherein quenching comprises mixing the POX stream with: a recycled portion of the cooled POX stream; a portion of the water separated from the POX stream; a portion of the recycle CO 2 stream from the PPS; or a combination thereof.

4. The process according to claim 1 , wherein said cooling the POX stream comprises cooling the POX stream in a POX heat exchanger against a cooling stream.

5. The process according to claim 1 , wherein the PPS turbine has an inlet pressure and an outlet pressure such that a ratio of the PPS turbine inlet pressure to the PPS turbine outlet pressure is 12 or less.

6. The process according to claim 1 , wherein passing the expanded PPS combustion product stream through the PPS recuperator heat exchanger cools the PPS combustion product stream to a temperature below a water dew point of the PPS combustion product stream.

7. The process according to claim 1 , wherein the fuel gas in the POX stream entering the PPS combustor comprises at least one fuel gas component selected from H 2 , CO, and CH 4 .

8. The process according to claim 1 , wherein prior to compressing the POX stream, the process further comprises carrying out at least one conversion reaction whereby the POX stream becomes enriched in at least one fuel gas component.

9. The process according to claim 8 , wherein the at least one conversion reaction comprises a conversion between a mixture of CO and H 2 O and a separate mixture of H 2 and CO 2 .

10. A combined partial oxidation (POX) system and power production system (PPS) comprising:
a POX reactor adapted to partially oxidize a liquid or solid carbonaceous fuel in the presence of oxygen to form a POX stream comprising a POX fuel gas;
one or more components adapted to cool the POX stream;
a compressor adapted to compress the POX stream to a pressure suitable for combustion and thus form a compressed POX stream;
a PPS combustor adapted to combust POX fuel gas in the compressed POX stream with oxygen in the presence of compressed recycled CO 2 and form a compressed PPS combustion product stream;
a turbine adapted to expand the PPS combustion product stream to form an expanded PPS combustion product stream and generate power in a connected generator;
a PPS recuperator heat exchanger adapted to transfer heat from the expanded PPS combustion product stream;
a PPS compressor adapted to compress recycled CO 2 from the expanded PPS combustion product stream and form a compressed recycled CO 2 ; and
flow components adapted to direct a portion of the compressed recycled CO 2 to the PPS recuperator heat exchanger so as to be in a heat exchange relationship with the expanded PPS combustion product stream.

11. The combined POX system and PPS system according to claim 10 , wherein the one or more components adapted to cool the POX stream comprises a quench stream entering the POX reactor.

12. The combined POX system and PPS system according to claim 10 , wherein the one or more components adapted to cool the POX stream comprises a heat exchanger downstream from the POX reactor and upstream from the compressor adapted to compress the POX stream.

13. The combined POX system and PPS system according to claim 10 , further comprising a POX scrubber downstream from the POX reactor and upstream from the compressor adapted to compress the POX stream and adapted to separate any solids present in the POX stream.

14. The combined POX system and PPS system according to claim 10 , further comprising a filtration device adapted to separate solidified ash particle from a single phase quenched POX fuel gas stream.

15. The combined POX system and PPS system according to claim 10 , further comprising a shift reactor.

16. The combined POX system and PPS system according to claim 10 , further comprising a separator adapted to separate any liquid water from the POX fuel gas.

17. The combined POX system and PPS system according to claim 10 , further comprising a PPS scrubbing tower adapted to separate one or more of H 2 SO 4 , HNO 3 , and water-dissolved Hg salts from the expanded PPS combustion product stream and output a recycle CO 2 stream.

18. The combined POX system and PPS system according to claim 10 , further comprising flow components adapted to direct a portion of the compressed recycled CO 2 to the one or more components adapted to cool the POX stream.

19. The combined POX system and PPS system according to claim 18 , further comprising flow components adapted to direct a portion of the compressed recycled CO 2 from the one or more components adapted to cool the POX stream to the PPS recuperator heat exchanger.

Assignees

• Palmer Labs Llc
• 8 Rivers Capital Llc

Inventors

• Allam Rodney John
• Fetvedt Jeremy Eron
• Palmer Miles R

Classifications

• C10J2300/1618

  Modification of synthesis gas composition, e.g. to meet some criteria · CPC title

• C10J3/84 Primary

  with means for removing dust or tar from the gas · CPC title

• C10J2300/1612

  CO2-separation and sequestration, i.e. long time storage · CPC title

• C10J2300/1606

  Combustion processes · CPC title

• F25J3/04618

  for cooling an air stream fed to the air fractionation unit · CPC title