Multi-combustor turbine

• US 9,279,364 B2
• Filed: 11/04/2011
• Issued: 03/08/2016
• Est. Priority Date: 11/04/2011
• Status: Active Grant

• Current Assignee: ReductoNox Corp.
• Original Assignee: Ener-Core Power, Inc. (Ener-Core, Inc.)
• Inventors: Hamrin, Douglas, Lampe, Steve
• Primary Examiner(s): Sung, Gerald L
• Application Number:
  US13/289,996
• Publication Number:
  US 20130111913A1
• Time in Patent Office: 1,586 Days
• US Class Current: 1/1
• CPC Class Codes: F02C 3/22 the fuel or oxidant being gaseous at standard temperature and pressure F02C3/28 takes precedence
• CPC Class Codes: F02C 7/08 Heating air supply before combustion, e.g. by exhaust gases
• CPC Class Codes: F02C 7/224 Heating fuel before feeding to the burner
• CPC Class Codes: F05D 2220/75 equipment using fuel having a low calorific value, e.g. low BTU fuel, waste end, syngas, biomass fuel or flare gas
• CPC Class Codes: F23C 2900/99001 Cold flame combustion or flameless oxidation processes
• CPC Class Codes: F23C 2900/99006 Arrangements for starting combustion
• CPC Class Codes: F23C 6/042 with fuel supply in stages for staged combustion F23C6/047
• CPC Class Codes: F23C 99/006 Flameless combustion stabilised within a bed of porous heat-resistant material F23C13/00 takes precedence; gas burners with radiant combustion on a porous surface F23D14/16
• CPC Class Codes: F23D 2900/21003 for heating or re-burning air or gas in a duct
• CPC Class Codes: F23L 15/04 Arrangements of recuperators
• CPC Class Codes: F23R 2900/00002 Gas turbine combustors adapted for fuels having low heating value [LHV]
• CPC Class Codes: F23R 2900/03341 Sequential combustion chambers or burners
• CPC Class Codes: F23R 3/346 for staged combustion
• CPC Class Codes: F23R 3/36 Supply of different fuels
• CPC Class Codes: Y02E 20/34 Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

A system for the gradual oxidation of fuel is disclosed. The system includes an oxidizer that has a reaction chamber with an inlet and an outlet. The reaction chamber is configured to receive a fluid comprising an oxidizable fuel through the inlet. The oxidizer is configured to maintain a flameless oxidation process. The system also includes a heating chamber with an inlet and an outlet. The inlet of the heating chamber is in fluid communication with the outlet of the reaction chamber. The heating chamber is configured to receive the fluid from the reaction chamber and selectably heat the fluid.

Claims

1. A system for gradually oxidizing fuel, comprising:

an oxidizer having a reaction chamber with an inlet and an outlet, the reaction chamber configured to receive a gas comprising an oxidizable fuel through the inlet, the oxidizer configured to maintain a flameless oxidation process;

a first heating chamber with an inlet and an outlet, the inlet of the first heating chamber in fluid communication with the outlet of the reaction chamber, the first heating chamber configured to receive the gas from the reaction chamber and to heat the gas;

a turbine having an inlet and an outlet, the inlet of the turbine coupled to the outlet of the first heating chamber and configured to receive the gas from the first heating chamber;

a compressor coupled to the inlet of the reaction chamber to compress the gas prior to the gas being received by the reaction chamber;

a second heating chamber coupled between the compressor and the inlet of the reaction chamber, the second heating chamber being configured to receive the compressed gas from the compressor and to heat the gas prior to the gas being received by the reaction chamber; and

a heat exchanger having a first portion coupled between the compressor and the second heating chamber such that the gas from the compressor passes through the first portion before the gas is received by the second heating chamber, and a second portion coupled to the outlet of the turbine such that the gas from the turbine passes through the second portion, the heat exchanger configured to thermally couple the gas in the second portion to the gas in the first portion.

2. The system of claim 1, wherein the oxidizer further comprises a porous media disposed within the reaction chamber.

3. The system of claim 1, wherein the oxidizer further comprises at least one anchor heater that is at least partially disposed within the reaction chamber.

4. The system of claim 1, wherein the oxidizer does not comprise a catalyst for the oxidation process.

5. The system of claim 1, wherein the oxidizer is further configured to maintain the oxidation process when the fuel content of the gas is below a level that will sustain a continuous flame.

6. The system of claim 5, wherein the oxidizer is further configured to maintain the oxidation process when the gas comprises less than 5% oxidizable fuel.

7. The system of claim 6, wherein the oxidizer is further configured to maintain the oxidation process when the oxidizable fuel is methane.

8. The system of claim 1, wherein the first heating chamber comprises a burner configured to ignite a combustible fuel-air mixture.

9. The system of claim 1, wherein the second heating chamber comprises a burner configured to ignite a combustible fuel-air mixture.

10. The system of claim 1, further comprising a power generator coupled to the turbine, the power generator configured to be driven by the turbine.

11. The system of claim 1, wherein:

the gas comprises at least one volatile organic compound (VOC); and

the oxidizer achieves at least partial oxidation of the VOC.

12. A gradual oxidation system comprising:

a compressor configured to receive and compress a gas comprising a fuel-air mixture;

a warmer coupled to the compressor, the warmer configured to receive the gas from the compressor and to heat the gas;

a reaction chamber coupled to the warmer, the reaction chamber configured to receive the gas from the warmer and maintain a flameless oxidation process of the fuel-air mixture without a catalyst;

a heater coupled to the reaction chamber, the heater configured to receive the gas from the reaction chamber and heat the gas;

a turbine coupled to the heater and the compressor, the turbine being configured to receive the gas from the heater and expand the gas; and

a controller coupled to the warmer and the heater, the controller configured to control the heating of the gas in the warmer and in the heater, wherein the controller is coupled to a sensor that measures a temperature of the gas at the outlet of the reaction chamber, the controller further configured to direct the warmer to heat the gas until the temperature reaches a setpoint.

13. The system of claim 12, further comprising a power generator coupled to the turbine and the controller, wherein the turbine is configured to drive the power generator and the controller is configured to control the power generator to maintain the turbine speed within a determined range.

14. A system for gradually oxidizing fuel, comprising:

an oxidizer having a reaction chamber with an inlet and an outlet, the reaction chamber configured to receive a gas comprising an oxidizable fuel through the inlet of the reaction chamber, the oxidizer configured to maintain a flameless oxidation process, wherein the oxidizer further comprises at least one anchor heater that is at least partially disposed within the reaction chamber; and

a heating chamber with an inlet and an outlet, the inlet of the heating chamber in fluid communication with the outlet of the reaction chamber, the heating chamber configured to receive the gas from the reaction chamber and to heat the gas.

15. The system of claim 14, wherein the heating chamber comprises a burner configured to ignite a combustible fuel-air mixture.

16. The system of claim 14, wherein the oxidizer further comprises a porous media disposed within the reaction chamber.

17. The system of claim 14, wherein the oxidizer does not comprise a catalyst for the oxidation process.

18. The system of claim 14, wherein the oxidizer is further configured to maintain the oxidation process when the fuel content of the gas is below a level that will sustain a continuous flame.

19. The system of claim 14, wherein:

the gas comprises at least one volatile organic compound (VOC); and

the oxidizer achieves at least partial oxidation of the VOC.

20. A system for gradually oxidizing fuel, comprising:

a heating chamber with an inlet and an outlet, the heating chamber configured to receive and heat a gas comprising an oxidizable fuel; and

an oxidizer having a reaction chamber with an inlet and an outlet, the inlet of the reaction chamber in fluid communication with the outlet of the heating chamber, the reaction chamber configured to receive the gas from the heating chamber, the oxidizer configured to maintain a flameless oxidation process, wherein the oxidizer further comprises at least one anchor heater that is at least partially disposed within the reaction chamber.

21. The system of claim 20, wherein the heating chamber comprises a burner configured to ignite a combustible fuel-air mixture.

22. The system of claim 20, wherein the oxidizer further comprises a porous media disposed within the reaction chamber.

23. The system of claim 20, wherein the oxidizer does not comprise a catalyst for the oxidation process.

24. The system of claim 20, wherein the oxidizer is further configured to maintain the oxidation process when the fuel content of the gas is below a level that will sustain a continuous flame.

25. The system of claim 20, wherein:

the gas comprises at least one volatile organic compound (VOC); and

the oxidizer achieves at least partial oxidation of the VOC.

26. A gradual oxidation system comprising:

a compressor configured to receive and compress a gas comprising a fuel-air mixture;

a warmer coupled to the compressor, the warmer configured to receive the gas from the compressor and to heat the gas;

a reaction chamber coupled to the warmer, the reaction chamber configured to receive the gas from the warmer and maintain a flameless oxidation process of the fuel-air mixture without a catalyst;

a heater coupled to the reaction chamber, the heater configured to receive the gas from the reaction chamber and heat the gas;

a turbine coupled to the heater and the compressor, the turbine being configured to receive the gas from the heater and expand the gas; and

a controller coupled to the warmer and the heater, the controller configured to control the heating of the gas in the warmer and in the heater, wherein the controller is coupled to a sensor that measures a temperature of the gas at the inlet of the turbine, the controller further configured to direct the heater to heat the gas until the temperature reaches a setpoint.

27. The system of claim 26, further comprising a power generator coupled to the turbine and the controller, wherein the turbine is configured to drive the power generator and the controller is configured to control the power generator to maintain the turbine speed within a determined range.