Fuel-air-flue gas burner

Patent metadata

Field	Value
Publication number	US-9631808-B2
Application number	US-201414550302-A
Country	US
Kind code	B2
Filing date	Nov 21, 2014
Priority date	Nov 21, 2014
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A gaseous fuel-air-flue gas burner is described herein. One device includes a housing having a combustion chamber containing a combustion area in which a combination of fuel, air, and flue gas mix to form a flame, a flame arrester having an outer surface for the flame to form, a supply chamber configured to receive the fuel, air, and flue gas mixture at an inlet and provide the combustion area with the fuel, air, and flue gas mixture at an outlet to produce a flame and a quantity of return flue gas, and a return cavity configured to move return flue gas away from the combustion area and into the inlet of the supply chamber.

First claim

What is claimed:

1. A gaseous fuel-air-flue gas burner, comprising:
a housing having a combustion chamber therein;
a combustion area in which a combination of fuel, air, and flue gas mix to form a flame within the combustion chamber;
a flame arrester having an outer surface for the flame to form, wherein the combustion area forms on the outer surface of the flame arrester;
a supply chamber configured to receive the fuel, air, and flue gas mixture at an inlet, and provide the combustion area with the fuel, air, and flue gas mixture at an outlet to produce a flame and a quantity of return flue gas, wherein the supply chamber is surrounded by the flame arrester; and
a return cavity configured to move return flue gas away from the combustion area and into the inlet of the supply chamber, wherein the return cavity is surrounded by the supply chamber.

2. The gaseous fuel-air-flue gas burner of claim 1 , wherein the supply chamber includes an opening adjacent to the flame arrester.

3. The gaseous fuel-air-flue gas burner of claim 2 , wherein the flame arrester includes an opening adjacent to the combustion area to provide the combustion area with the fuel, air, and flue gas mixture such that the flame is prevented from re-entering the supply chamber.

4. The gaseous fuel-air-flue gas burner of claim 1 , wherein the supply chamber is configured to provide the combustion area with the fuel-oxygen-flue gas mixture in an annular distribution about the flame arrester.

5. The gaseous fuel-air-flue gas burner of claim 1 , wherein the return cavity is configured to receive the return flue gas after the return flue gas moves through the combustion chamber.

6. A system for a gaseous fuel-air-flue gas burner, comprising:
a housing having a combustion chamber therein;
a combustion area in which a fuel, air, and flue gas mixture is ignited to form a flame;
a flame arrester having an outer surface for the flame to form;
a blower assembly providing a fuel, air, and flue gas mixture to a supply chamber that is surrounded by the flame arrester, wherein:
the blower assembly is configured to supply an outside air and gas mixture via a combustion intake;
the blower assembly is configured to receive flue gas from a return cavity that is surrounded by the supply chamber; and
the blower assembly mixes the outside air and gas mixture with the return flue gas to supply the fuel, air, and flue gas mixture to the supply chamber.

7. The system of claim 6 , wherein the combustion chamber contains a helical coil.

8. The system of claim 7 , wherein the helical coil contains water.

9. The system of claim 6 , wherein the combustion area in which a fuel, air, and flue gas mixture is ignited to form a flame produces the return flue gas that transfers heat to the water inside the helical coil via convective heat transfer.

10. The system of claim 6 , wherein the return flue gas is directed into the return cavity via the blower assembly.

11. The system of claim 10 , wherein the return cavity is adjacent to the supply chamber to allow the heat from the return flue gas in the return cavity to transfer to the fuel, air, and flue gas mixture in the supply chamber.

12. The system of claim 6 , wherein some of the return flue gas in the return cavity is recycled back into the blower assembly and some of the return flue gas is exhausted out of the system via an exhaust port.

13. A gaseous fuel-air-flue gas burner, comprising:
a housing having a combustion chamber therein;
a combustion area in which a combination of fuel, air, and flue gas mix to form a flame within the combustion chamber;
a flame arrester having an outer surface for the flame to form, wherein the combustion area forms on the outer surface of the flame arrester;
a supply chamber surrounded by the flame arrester and configured to provide the combustion area with the fuel, air, and flue gas mixture to produce the flame and a quantity of return flue gas;
a return cavity surrounded by the supply chamber and configured to move the return flue gas away from the combustion area and into the supply chamber;
a control valve that regulates an amount of the return flue gas to be recycled with an outside air and gas mixture in a blower assembly; and
an exhaust pipe configured to move the return flue gas not recycled with the outside air and gas mixture in the blower assembly via the control valve outside the fuel-air-flue gas burner.

14. The system of claim 13 , wherein the combustion area is on the outside of the supply chamber.

15. The system of claim 13 , wherein the control valve is adjustable to regulate an amount of return flue gas to recycle with the outside air and gas mixture in the blower assembly.

16. The system of claim 15 , wherein the outside air and gas mixture is drawn into the blower assembly via combustion intake for determining the amount of the return flue gas to recycle based on the oxygen content in the outside air and gas mixture.

17. The system of claim 13 , wherein the non-recycled flue gas is exhausted outside of the gaseous fuel-air-flue gas burner via the exhaust pipe.

Assignees

• Honeywell Int Inc

Inventors

• Taylor Curtis
• Goh Joseph S F

Classifications

• F23C7/008

  Flow control devices (F23C7/006 takes precedence) · CPC title

• F23C9/08 Primary

  for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber · CPC title

• F23D14/82

  Preventing flashback or blowback · CPC title

• F24H1/145

  using fluid fuel · CPC title

• F24H9/2035

  using fluid fuel · CPC title