COMBINED CYCLE POWER PLANT WITH CO2 CAPTURE PLANT

• US 20130312386A1
• Filed: 07/29/2013
• Published: 11/28/2013
• Est. Priority Date: 02/01/2011
• Status: Abandoned Application

• Current Assignee: Alstom Technology Ltd. (Alstom SA)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: WIRSUM, Manfred, RUCHTI, Christoph, LI, Hongtao, DROUX, Franois, KOZAK, Frederic Zenon, ZAGORSKIY, Alexander
• Application Number:
  US13/953,143
• Publication Number:
  US 20130312386A1
• Time in Patent Office: Days
• US Class Current: 60/39.182
• CPC Class Codes: B01D 2252/102 Ammonia
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: F01K 13/00 General layout or general methods of operation of complete plants
• CPC Class Codes: F01K 23/064 in combination with an industrial process, e.g. chemical, metallurgical
• CPC Class Codes: F01K 23/068 in combination with an oxygen producing plant, e.g. an air separation plant
• CPC Class Codes: F01K 23/10 with exhaust fluid of one cycle heating the fluid in another cycle F01K17/025 takes precedence
• CPC Class Codes: F22B 1/1815 using the exhaust gases of gas-turbines
• CPC Class Codes: F25J 2210/62 Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
• CPC Class Codes: F25J 2210/70 Flue or combustion exhaust gas
• CPC Class Codes: F25J 2230/02 Compressor intake arrangement, e.g. filtering or cooling
• CPC Class Codes: F25J 2230/80 the fluid being carbon dioxide
• CPC Class Codes: F25J 2240/82 with waste heat recovery, e.g. in a combined cycle, i.e. for generating steam used in a Rankine cycle
• CPC Class Codes: F25J 2260/80 Integration in an installation using carbon dioxide, e.g. for EOR, sequestration, refrigeration etc.
• CPC Class Codes: F25J 2270/904 by liquid or gaseous cryogen in an open loop
• CPC Class Codes: F25J 3/04018 of main feed air
• CPC Class Codes: F25J 3/04266 and being liquefied hydrocarbons
• CPC Class Codes: F25J 3/04533 for the direct combustion of fuels in a power plant, so-called "oxyfuel combustion"
• CPC Class Codes: F25J 3/04593 The air gas consuming unit is also fed by an air stream
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02E 20/14 : Combined heat and power generation [CHP]
• CPC Class Codes: Y02E 20/16 : Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
• CPC Class Codes: Y02E 20/18 : Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]
• CPC Class Codes: Y02E 20/32 : Direct CO2 mitigation

Abstract

A combined cycle power plant includes a CO2 capture system operatively integrated with a liquefied natural gas LNG regasification system, where cold energy from the regasification process is used for cooling processes within the CO2 capture system or processes associated with it. These cooling systems include systems for cooling lean or rich absorption solutions for the CO2 capture or the cooling of flue gas. The LNG regasification system is arranged in one or more heat exchange stages having and one or more cold storage units. The power plant with CO2 capture can be operated at improved overall efficiencies.

Claims

1. A combined cycle power plant comprising a gas turbine (GT), a steam turbine (ST), a heat recovery steam generator (HRSG), a liquefied natural gas (LNG) regasification system, and a CO2 capture system arranged to process exhaust gases exhausted by the heat recovery steam generator (HRSG) wherein

the liquefied natural gas regasification system comprises heat exchangers operatively connected with heat exchangers within the CO2 capture system,

wherein one or more heat exchangers arranged in a cascaded way, configured for the operation at temperatures of the natural gas form an LNG inlet temperature up to at least −

10°

C. and of which at least one heat exchanger is configured and arranged for heat exchange between the liquefied natural gas and a heat exchange medium, where that heat exchange medium has cryogenic temperatures or chilling temperatures at the output from that at least one heat exchanger.

2. The combined cycle power plant according to claim 1 wherein

the CO2 capture system is a system arranged for a chilled ammonia process and the power plant comprises lines to direct the heat exchange medium from this regasification heat exchanger to one or more of the following refrigeration systems within the CO2 capture system

a cooler integrated in a cooling circuit of a flue gas direct contact cooler (DCC),

a water cooler prior to a flue gas water wash apparatus (WW),

a cooler for the cooling of CO2 rich absorption solution within the CO2 capture system.

3. The combined cycle power plant according to claim 1 wherein

the CO2 capture system is a system arranged for an amine process for the removal of CO2 from flue gases and the liquefied natural gas regasification system comprises one or more heat exchangers arranged in a cascaded way, configured for the operation of the natural gas from an LNG inlet temperature up to at least 0°

C. and of which at least one heat exchanger is configured and arranged for heat exchange between the liquefied natural gas and a heat exchange medium, where that heat exchange medium has cryogenic temperature or chilling temperatures at the output from that at least one heat exchanger.

4. The combined cycle power plant according to claim 3 wherein

the power plant comprises lines to direct the heat exchange medium from this regasification heat exchanger to a system (LSC) for cooling a CO2 lean solution within the CO2 capture amine process system.

5. The combined cycle power plant according to claim 1 wherein

the at least one heat exchanger, which is configured and arranged for heat exchange between the liquefied natural gas and a heat exchange medium that has a cryogenic temperature or a chilling temperature at the output from the heat exchanger, is operatively connected to a system for cooling the inlet air to the gas turbine (GT) of the combined cycle power plant.

6. The combined cycle power plant according to claim 5 wherein

the one or more heat exchangers of the liquefied natural gas regasification system are additionally operatively connected to one or more of the following systems of the combined cycle power plant:

a system for flue gas cooling prior to its entry to the CO2 capture system,

a system for flue gas chilling prior to its entry to the CO2 capture system.

a cooling water system for the steam turbine condenser,

a system for the cooling of flue gas recirculated after the HRSG back to the gas turbine inlet,

a system for the chilling of flue gas recirculated after the HRSG back to the gas turbine inlet,

a system for cooling of CO2 extracted by the CO2 capture system.

a system for drying CO2 by means of chilling.

7. The combined cycle power plant according to claim 1 wherein

the heat exchangers of the liquefied natural gas regasification system are arranged either in series or in parallel.

8. The combined cycle power plant according to claim 7 wherein

each of the heat exchangers of the LNG regasification system are configured and arranged for heat exchange within a given temperature range, where each one of the heat exchangers can comprise one or more heat exchange apparatuses, which can be arranged either in series or in parallel to one another.

9. The combined cycle power plant according to claim 5 wherein

the liquefied natural gas regasification system comprises one or more cold storage units for the storage of liquefied natural gas arranged in parallel to its heat exchangers.

10. The combined cycle power plant according to claim 1 wherein

the system for liquefied natural gas regasification comprises a heat exchanger configured and arranged for the liquefaction of CO2 extracted by the CO2 capture system.

11. The combined cycle power plant according to claim 6 wherein

a line leads from the system for drying and cooling CO2 to the heat exchanger for CO2 liquefaction and a line for liquefied CO2 leads from this heat exchanger to a transport facility (T) or pump.

12. The combined cycle power plant according to claim 1 wherein

the liquefied natural gas regasification system comprises a heat exchanger configured and arranged for heat exchange between liquefied natural gas and a medium having cryogenic temperatures at the output of said heat exchanger and a line for said heat exchange medium that leads to an air separation unit, and a line leads from said air separation unit (ASU) back to said heat exchanger.

13. The combined cycle power plant according to claim 5 wherein

the liquefied natural gas regasification system is additionally operatively connected to the cooling system for the steam turbine (ST) condenser.