Systems and methods for power generation with flameless combustion

Patent metadata

Field	Value
Publication number	US-11572828-B2
Application number	US-201916519369-A
Country	US
Kind code	B2
Filing date	Jul 23, 2019
Priority date	Jul 23, 2018
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

The present disclosure provides systems and methods wherein power production can be achieved with combustion of a fuel utilizing flameless combustion. A fuel may be combusted in a combustor/turbine in a substantially flameless operation to produce a combustion product stream that can be expanded for power generation. After expansion, the output stream can be treated to generate a recycle CO 2 stream into which an oxidant can be input. The recycle CO 2 stream including the oxidant can be injected into the combustor/turbine to effect combustion in a substantially flameless state. Various control schemes can be implemented to automatically control the concentration of oxygen present in the recycle CO 2 stream that is injected into the combustor/turbine in order to achieve and/or maintain substantially flameless combustion.

First claim

The invention claimed is:

1. A method for power generation, the method comprising:
providing a recycle stream comprising CO 2 ;
adding an oxidant to the recycle stream comprising CO 2 such that the recycle stream comprising CO 2 further includes the oxidant in an amount of about 2% to about 15% by mass based on the total mass of the recycle stream comprising CO 2 ;
injecting the recycle stream comprising CO 2 and including the oxidant into a combustion turbine with a fuel to cause combustion of the fuel and formation of a combustion product stream; and
generating power by expanding the combustion product stream in the combustion turbine.

2. The method of claim 1 , wherein the combustion of the fuel is substantially flameless.

3. The method of claim 1 , further comprising heating the recycle stream comprising CO 2 and including the oxidant to a temperature in the range of about 400° C. to about 2000° C. prior to injecting into the combustion turbine.

4. The method of claim 3 , wherein heating the recycle stream comprising CO 2 and including the oxidant comprises passing the recycle stream comprising CO 2 and including the oxidant through a recuperative heat exchanger.

5. The method of claim 4 , wherein heating comprises utilizing heat withdrawn from the combustion product stream.

6. The method of claim 3 , wherein heating the recycle stream comprising CO 2 and including the oxidant comprises passing the recycle stream comprising CO 2 and including the oxidant through a dedicated heater.

7. The method of claim 6 , comprising withdrawing a sidestream from the recycle stream comprising CO 2 and including the oxidant and passing only the sidestream through the dedicated heater.

8. The method of claim 1 , further comprising treating the combustion product stream exiting the combustion turbine to remove one or more components thereof and form the recycle stream comprising CO 2 .

9. The method of claim 1 , further comprising pressurizing the recycle stream comprising CO 2 and including the oxidant using one or both of a pump and compressor to a pressure suitable for input to the combustion turbine.

10. The method of claim 1 , wherein the oxidant is added to the recycle stream comprising CO 2 at an inlet positioned upstream from a pump and downstream from a compressor.

11. The method of claim 1 , wherein the oxidant is added to the recycle stream comprising CO 2 at an inlet positioned upstream from a compressor.

12. The method of claim 1 , wherein the combustion turbine comprises a combustor having an inlet end and an outlet end spaced apart along a longitudinal axis thereof, the combustor having a combustion chamber positioned between the inlet end and the outlet end.

13. The method of claim 12 , comprising injecting the fuel into the combustor substantially only proximate to the inlet end, and injecting the recycle stream comprising CO 2 and including the oxidant into the combustor proximate to the inlet end and also into the combustion chamber along at least a portion of a longitudinal axis of the combustion chamber.

14. The method of claim 1 , comprising measuring an oxygen content of the recycle stream comprising CO 2 to generate an oxidant inlet command that regulates the adding of the oxidant to the recycle stream comprising CO 2 at an oxidant inlet so that the concentration of oxygen in the recycle stream comprising CO 2 and including the oxidant is maintained within a defined oxygen concentration.

15. The method of claim 14 , wherein the defined oxygen concentration is about 4% to about 7% molar based on the total content of the recycle stream comprising CO 2 and including the oxidant.

16. The method of claim 14 , comprising regulating the adding of the oxidant to the recycle stream comprising CO 2 at the oxidant inlet so that the concentration of the oxygen in the recycle stream comprising CO 2 and including the oxidant is initially set at a first, higher concentration that promotes flamed combustion and is then set to a second, lower concentration that promotes flameless combustion.

Assignees

• 8 Rivers Capital Llc

Inventors

• Fetvedt Jeremy Eron
• Forrest Brock Alan

Classifications

• F02C7/143

  before or between the compressor stages · CPC title

• F02C3/34 Primary

  with recycling of part of the working fluid, i.e. semi-closed cycles with combustion products in the closed part of the cycle · CPC title

• F02C7/08

  Heating air supply before combustion, e.g. by exhaust gases · CPC title

• Y02E20/34

  Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery · CPC title