Gradual oxidation with heat transfer

• US 9,567,903 B2
• Filed: 03/09/2012
• Issued: 02/14/2017
• Est. Priority Date: 03/09/2012
• Status: Active Grant

• Current Assignee: ReductoNox Corp.
• Original Assignee: Ener-Core Power, Inc. (Ener-Core, Inc.)
• Inventors: Armstrong, Jeffrey, Martin, Richard, Hamrin, Douglas
• Primary Examiner(s): Sutherland, Steven
• Application Number:
  US13/417,129
• Publication Number:
  US 20130232945A1
• Time in Patent Office: 1,803 Days
• Field of Search: 607/74, 607/22, 607/23, 607/33, 607/77, 60/395, 60/392.81, 607/91, 60/391.82, 422/168, 422/173, 431/268, 431/2, 431/5, 431/7
• 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 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 7/1435 by water injection
• 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: F22B 1/22 using combustion under pressure substantially exceeding atmospheric pressure
• CPC Class Codes: F23C 2202/10 Premixing fluegas with fuel and combustion air
• CPC Class Codes: F23C 2203/10 using heat exchanger
• CPC Class Codes: F23C 2203/20 using heat absorbing device in flame F23C2203/10 takes precedence
• CPC Class Codes: F23C 9/08 for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
• CPC Class Codes: F23G 2206/202 with an internal combustion engine
• CPC Class Codes: F23G 7/066 preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
• CPC Class Codes: F23R 2900/00002 Gas turbine combustors adapted for fuels having low heating value [LHV]
• CPC Class Codes: Y02E 20/12 Heat utilisation in combustion or incineration of waste
• CPC Class Codes: Y02E 20/14 Combined heat and power generation [CHP]
• CPC Class Codes: Y02E 20/30 Technologies for a more efficient combustion or heat usage
• 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. A system for 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 oxidation of the fuel within the reaction chamber;

means for drawing heat from the reaction chamber; and

a controller that outputs instructions to the means for drawing heat from the reaction chamber to draw heat out of the reaction chamber while a calculated adiabatic reaction temperature within the reaction chamber exceeds a flameout temperature, such that an actual temperature within the reaction chamber is reduced to a temperature that does not exceed the flameout temperature.

2. The system of claim 1, wherein the means for drawing heat from the reaction chamber comprises a heat exchanger.

3. The system of claim 1, wherein the means for drawing heat from the reaction chamber comprises a fluid.

4. The system of claim 1, wherein the means for drawing heat from the reaction chamber comprises a means for generating steam.

5. The system of claim 1, wherein the means for drawing heat is configured to draw heat from the reaction chamber when the actual temperature within the reaction chamber increases to the flameout temperature.

6. The system of claim 1, further comprising means for raising a temperature of the gas, at the inlet of the reaction chamber, to above an autoignition temperature of the fuel.

7. The system of claim 6, wherein the means for raising a temperature comprises a heat exchanger within the oxidizer.

8. The system of claim 1, wherein the reaction chamber is configured to maintain oxidation of the oxidizable fuel without a catalyst.

9. The system of claim 1, wherein the means for drawing heat from the reaction chamber is configured to draw heat out of the reaction chamber when the actual temperature within the reaction chamber exceeds 2300°

F.

10. The system of claim 1, further comprising a turbine that receives gas from the outlet of the reaction chamber and expands the gas.

11. The system of claim 1, further comprising a compressor that receives and compresses gas, comprising a fuel mixture, prior to introduction of the fuel mixture into the reaction chamber.

12. The system of claim 1, wherein the oxidizable fuel comprises at least one of hydrogen, methane, ethane, ethylene, natural gas, propane, propylene, propadiene, n-butane, iso-butane, butylene-1, butadiene, iso-pentane, n-pentane, acetylene, hexane, and carbon monoxide.

13. A system for 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 within the reaction chamber;

a heat exchanger; and

a controller that outputs instructions to the heat exchanger to draw heat from the reaction chamber while a calculated adiabatic reaction temperature within the reaction chamber exceeds a flameout temperature, such that an actual temperature within the reaction chamber is reduced to a level that does not exceed the flameout temperature.

14. The system of claim 13, wherein the heat exchanger is configured to draw heat from the reaction chamber when the actual temperature of the reaction chamber increases to the flameout temperature.

15. The system of claim 13, further comprising a turbine that receives gas from the reaction chamber and expands the gas.

16. The system of claim 13, further comprising a compressor that receives and compresses gas, comprising a fuel mixture, prior to introduction of the fuel mixture into the reaction chamber.

17. The system of claim 13, wherein the heat exchanger is configured to raise a temperature of the gas, at the inlet of the reaction chamber, to above an autoignition temperature of the fuel.

18. The system of claim 13, wherein the heat exchanger comprises a fluid introduced into the reaction chamber.

19. The system of claim 18, wherein the heat exchanger is configured to evacuate the fluid from the reaction chamber.

20. The system of claim 13, wherein the heat exchanger comprises a means for generating steam.

21. The system of claim 13, wherein the reaction chamber is configured to maintain flameless oxidation of the oxidizable fuel without a catalyst.

22. The system of claim 13, wherein the heat exchanger is configured to draw heat out of the reaction chamber when the actual temperature within the reaction chamber exceeds 2300°

F.

23. The system of claim 13, wherein the oxidizable fuel comprises at least one of hydrogen, methane, ethane, ethylene, natural gas, propane, propylene, propadiene, n-butane, iso-butane, butylene-1, butadiene, iso-pentane, n-pentane, acetylene, hexane, and carbon monoxide.