Process for generating cool flame and flameless fuel oxidation using non-equilibrium plasma activation

Patent metadata

Field	Value
Publication number	US-10640720-B2
Application number	US-201515301590-A
Country	US
Kind code	B2
Filing date	Apr 3, 2015
Priority date	Apr 4, 2014
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

An exemplary embodiment can be an exemplary method, which can include, for example, generating a cool flame(s) using a plasma-assisted combustion, and maintaining the cool flame(s). The cool flame(s) can have a temperature below about 1050 Kelvin, which can be about 700 Kelvin. The cool flame(s) can be further generated using a heated counterflow burning arrangement and a an ozone generating arrangement. The heated counterflow burning arrangement can include a liquid fuel vaporization arrangement. The ozone generating arrangement can include a micro plasma dielectric barrier discharge arrangement. The plasma-assisted combustion can be generated using (i) liquid n-heptane, (i) heated nitrogen, and (iii) ozone.

First claim

What is claimed is:

1. A method, comprising:
generating at least one chemically active species in at least one of air, oxygen or a fuel-lean mixture using a plasma generator;
mixing the at least one chemically active species with at least one fuel to produce a species-fuel mixture;
generating at least one burner stabilized cool flame at a temperature of between about 500 Kelvin and about 1050 Kelvin using the species-fuel mixture; and
maintaining the at least one burner stabilized cool flame at the temperature of between about 500 Kelvin and about 1050 Kelvin,
wherein the at last one burner stabilized cool flame is a self-sustaining cool flame that is stable between about 500 Kelvin and about 1050 Kelvin, and
wherein the at least one burner stabilized cool flame is further generated using a heated counterflow flame arrangement.

2. The method of claim 1 , wherein the generating the at least one burner stabilized cool flame at the temperature of between about 500 Kelvin and about 1050 Kelvin includes generating the at least one burner stabilized cool flame at about 700 Kelvin.

3. The method of claim 1 , wherein the plasma generator is an ozone generating arrangement.

4. The method of claim 1 , wherein the heated counterflow flame arrangement includes a liquid fuel vaporization arrangement.

5. The method of claim 3 , wherein the ozone generating arrangement includes a micro plasma dielectric barrier discharge arrangement.

6. The method of claim 1 , further comprising generating the burner stabilized cool flame using (i) liquid normal alkane, (ii) heated nitrogen, (iii) ozone, (iv) at least one ether, (v) at least one fuel, or (vi) air.

7. The method of claim 6 , wherein the ozone is between about 0.1% and about 5%.

8. The method of claim 6 , wherein at least one of the heated nitrogen or the air has a temperature between about 400 Kelvin and about 850 Kelvin.

9. The method of claim 6 , further comprising decomposing the ozone using at least one of the heated nitrogen or the air.

10. The method of claim 6 , further comprising generating the ozone using at least one of at least one stream of oxygen or the air.

11. The method of claim 6 , further comprising diluting at least one of the liquid normal alkane or the ozone using a dilution gas.

12. The method of claim 11 , wherein the dilution gas includes at least one of helium, argon or nitrogen.

13. The method of claim 1 , wherein the plasma-assisted combustion is plasma-assisted moderate or intense low-oxygen dilution combustion (MILD).

14. The method of claim 1 , wherein the maintaining the at least one cool flame between about 500 Kelvin and about 1050 Kelvin is performed after an ignition of the at least one burner stabilized cool flame.

15. The method of claim 1 , wherein the plasma generator is a low-temperature plasma generator.

16. The method of claim 1 , wherein the mixture includes accelerated cool flame chemistry including at least one hydroperoxyl radical.

17. An apparatus, comprising:
a plasma generator configured to generate at least one chemically active species in at least one of air, oxygen or a fuel-lean mixture;
a fuel generator configured to generate at least one fuel; and
a cool flame burner configured to generate at least one stable cool flame at a temperature of between about 500 Kelvin and about 1050 Kelvin by mixing the at least one chemically active species and the at least one fuel in a plasma-assisted combustion;
wherein the at least one cool flame is a self-sustaining cool flame.

18. The apparatus of claim 17 , further comprising a pressure chamber, wherein the plasma generator, the fuel generator, and the cool flame burner are located inside of the pressure chamber.

19. The apparatus of claim 17 , wherein the fuel generator includes a liquid fuel vaporization arrangement which is configured to burn liquid n-heptane.

20. The apparatus of claim 17 , wherein the plasma generator includes an ozone generator, which includes a micro plasma dielectric barrier discharge arrangement.

21. The apparatus of claim 19 , wherein the ozone generator generates the ozone using oxygen.

22. The apparatus of claim 17 , further comprising a plurality of electrodes, wherein at least one of the electrodes is electrically coupled to the plasma generator and at least one other of the electrodes is electrically coupled to the fuel generator.

23. The apparatus of claim 17 , wherein the cool flame arrangement is configured to maintain the at least one cool flame between about 500 Kelvin and about 1050 Kelvin after an ignition of the at least one cool flame.

24. The apparatus of claim 17 , wherein the plasma generator is a low-temperature plasma generator.

Assignees

• Univ Princeton

Inventors

• Ju Yiguang
• Won Sang Hee
• Sun Weiqi

Classifications

• F23C2900/99005

  Combustion techniques using plasma gas · CPC title

• F23C99/001

  Applying electric means or magnetism to combustion (for combustion engines F02B51/04, F02M27/04) · CPC title

• C10L10/00 Primary

  Use of additives to fuels or fires for particular purposes (additives for liquid carbonaceous fuels characterised by their chemical nature C10L1/10; using binders for briquetting solid fuels C10L5/10; using additives to improve the combustion of solid fuels C10L9/10) · CPC title

• F23C2900/99001

  Cold flame combustion or flameless oxidation processes · CPC title

• F23J7/00

  Arrangement of devices for supplying chemicals to fire · CPC title