Gradual oxidation with adiabatic temperature above flameout temperature

• US 8,926,917 B2
• Filed: 03/09/2012
• Issued: 01/06/2015
• Est. Priority Date: 03/09/2012
• Status: Expired due to Fees

• Current Assignee: ReductoNox Corp.
• Original Assignee: Ener-Core Power, Inc. (Ener-Core, Inc.)
• Inventors: Maslov, Boris A.
• Primary Examiner(s): YOUNG, NATASHA E
• Application Number:
  US13/417,110
• Publication Number:
  US 20130236371A1
• Time in Patent Office: 1,033 Days
• Field of Search: 422/129, 422/187, 422/198, 422/202, 422/234, 165/108, 165/157, 165/177
• US Class Current: 422/198
• CPC Class Codes: B01D 2258/05 Biogas
• CPC Class Codes: B01D 53/343 Heat recovery
• CPC Class Codes: F02C 3/20 using a special fuel, oxidant, or dilution fluid to generate the combustion products
• CPC Class Codes: F02C 3/30 Adding water, steam or other fluids for influencing combustion, e.g. to obtain cleaner exhaust gases F02C7/141, F02C7/30, F01D21/00, F01K21/04, F23D11/10 take precedence
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F02C 7/08 Heating air supply before combustion, e.g. by exhaust gases
• CPC Class Codes: F02C 7/143 before or between the compressor stages
• CPC Class Codes: F02G 3/02 with reciprocating-piston engines
• 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: Y02E 20/14 Combined heat and power generation [CHP]
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

Described herein are embodiments of systems and methods for oxidizing gases. In some embodiments, a reaction chamber is configured to receive a fuel gas and maintain the gas at a temperature within the reaction chamber that is above an autoignition temperature of the gas. The reaction chamber may also be configured to maintain a reaction temperature within the reaction chamber below a flameout temperature. In some embodiments, heat and product gases from the oxidation process can be used, for example, to drive a turbine, reciprocating engine, and injected back into the reaction chamber.

Claims

1. An oxidizer for oxidizing fuel, comprising:

a reaction chamber having (i) one or more inlets that are configured to direct at least one gas of fuel, oxidants, or diluents, into the reaction chamber and (ii) one or more outlets that are configured to direct reaction products from the reaction chamber;

a regulator that is configured to maintain a temperature of one or more of the at least one gas, at or before the one or more inlets, to be below an autoignition temperature of a resulting mixture, within the reaction chamber, that comprises the at least one gas of fuel, oxidants, or diluents;

a heat exchanger, positioned within the reaction chamber, configured to heat the incoming resulting mixture at or near the one or more inlets, such that a temperature of the resulting mixture inside the reaction chamber is increased above the autoignition temperature;

a heat extractor that removes heat from the reaction chamber after the mixture inside the reaction chamber is increased above the autoignition temperature; and

a controller, comprising;

a detection module that detects when a reaction temperature within the reaction chamber exceeds a flameout temperature of the mixture; and

a correction module that outputs instructions, based on the detection module, to change a removal of heat from the reaction chamber by the heat extractor to maintain an adiabatic temperature within the reaction chamber above the flameout temperature of the mixture and a maximum reaction temperature within the reaction chamber below the flameout temperature of the mixture.

2. The oxidizer of claim 1, wherein the heat extractor is configured to remove heat from the reaction chamber by generating steam.

3. The oxidizer of claim 1, wherein the heat exchanger comprises a porous media within the reaction chamber.

4. The oxidizer of claim 1, wherein the heat exchanger comprises a fluid media within the reaction chamber.

5. The oxidizer of claim 1, wherein the heat exchanger comprises a media that is circulated through the reaction chamber.

6. The oxidizer of claim 1, wherein the heat exchanger comprises a tube-in-tube heat exchanger.

7. The oxidizer of claim 1, wherein the reaction chamber comprises a single inlet.

8. The oxidizer of claim 1, wherein the regulator is configured to mix diluents with fuel at or before the one or more inlets.

9. The oxidizer of claim 1, wherein the oxidizer is configured to use heat from reaction products to drive a generator for power generation.

10. The oxidizer of claim 1, wherein the oxidizer is configured to drive a generator by a turbine or a piston engine that is configured to expand reaction products from the reaction chamber.

11. The oxidizer of claim 1, wherein the oxidizer is configured to use heat from reaction products to heat material that is not passed through the oxidizer.

12. The oxidizer of claim 1, wherein the oxidizer is configured to change a flow rate that one or more of the at least one gas of fuel, oxidants, or diluents is introduced into the reaction chamber through the one or more inlets.

13. The oxidizer of claim 1, wherein the oxidizer is configured to change a flow rate that the reaction products are directed from the reaction chamber through the one or more outlets.

14. The oxidizer of claim 1, further comprising a regulator that is configured to change at least one of a flow of the mixture or a pressure of the mixture at or near the one or more inlets.

15. An oxidizer for oxidizing fuel, comprising:

a reaction chamber having (i) an inlet that is configured to direct at least one gas of fuel, oxidants, or diluents, into the reaction chamber and (ii) an outlet that is configured to direct reaction products from the reaction chamber;

means for maintaining a temperature of one or more of the at least one gas, at or before the inlet, to be below an autoignition temperature of a resulting mixture, within the reaction chamber, that comprises the at least one gas of fuel, oxidants, or diluents;

a heat exchanger, positioned within the reaction chamber, configured to heat the incoming resulting mixture at or near the inlet, such that a temperature of the resulting mixture inside the reaction chamber is increased above the autoignition temperature;

means for removing heat from the reaction chamber after the mixture inside the reaction chamber is increased above the autoignition temperature; and

a controller, comprising;

a detection module that detects when a reaction temperature within the reaction chamber exceeds a flameout temperature of the mixture; and

a correction module that outputs instructions, based on the detection module, to change a removal of heat from the reaction chamber by the heat extractor to maintain an adiabatic temperature within the reaction chamber above a flameout temperature of the mixture and a maximum reaction temperature within the reaction chamber below the flameout temperature of the mixture.

16. The oxidizer of claim 15, wherein the means for removing heat is configured to remove heat from the reaction chamber by generating steam.

17. The oxidizer of claim 15, wherein the heat exchanger comprises a porous media within the reaction chamber.

18. The oxidizer of claim 15, wherein the heat exchanger comprises a fluid media within the reaction chamber.

19. The oxidizer of claim 15, wherein the heat exchanger comprises a media that is circulated through the reaction chamber.

20. The oxidizer of claim 15, wherein the reaction chamber comprises a plurality of inlets.

21. The oxidizer of claim 15, wherein the reaction chamber comprises a plurality of outlets.

22. The oxidizer of claim 15, wherein the means for maintaining is configured to mix diluents with fuel at or before the inlet.

23. The oxidizer of claim 15, wherein the oxidizer is configured to use heat from reaction products to drive a generator for power generation.

24. The oxidizer of claim 15, wherein the oxidizer is configured to drive a generator by a turbine or a piston engine that is configured to expand reaction products from the reaction chamber.

25. The oxidizer of claim 15, wherein the oxidizer is configured to use heat from reaction products to heat material that is not passed through the reaction chamber.

26. The oxidizer of claim 15, wherein the oxidizer is configured to change a flow rate that one or more of the at least one gas of fuel, oxidants, or diluents is introduced into the reaction chamber through the inlet.

27. The oxidizer of claim 15, wherein the oxidizer is configured to change a flow rate that reaction products are directed from the reaction chamber through the outlet.

28. The oxidizer of claim 15, further comprising a regulator that is configured to change at least one of a flow of the mixture or a pressure of the mixture at or near the inlet.