Fuel-air-flue gas burner

Patent metadata

Field	Value
Publication number	US-2016146455-A1
Application number	US-201414550302-A
Country	US
Kind code	A1
Filing date	Nov 21, 2014
Priority date	Nov 21, 2014
Publication date	May 26, 2016
Grant date	—

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; 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; a return cavity configured to move return flue gas away from the combustion area and into the inlet of 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 opening of the supply chamber is a radial opening.

5 . The gaseous fuel-air-flue gas burner of claim 3 , wherein the opening of the flame arrester is a radial opening.

6 . 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.

7 . 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.

8 . 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 blower assembly providing a fuel, air, and flue gas mixture to a supply chamber, 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 return flue gas from a return cavity; 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.

9 . The system of claim 8 , wherein the combustion chamber contains a helical coil.

10 . The system of claim 9 , wherein the helical coil contains water.

11 . The system of claim 8 , wherein the flame produces the return flue gas that transfers heat to the water inside the helical coil via convective heat transfer.

12 . The system of claim 8 , wherein the return flue gas is directed into the return cavity via the blower assembly.

13 . The system of claim 12 , wherein the heat from the return flue gas in the return cavity is transferred to the fuel, air, and flue gas mixture in the supply chamber via convective and conductive heat transfer.

14 . The system of claim 8 , wherein a portion of the return flue gas in the return cavity is recycled back into the blower assembly and a portion is exhausted out of the system.

15 . 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; a supply chamber within the flame arrester configured to provide the combustion area with the fuel, air, and flue gas mixture to produce a flame and a quantity of return flue gas; a return cavity within the supply chamber configured to move return flue gas away from the combustion area and into the supply chamber; a control valve that regulates an amount of return flue gas to be recycled with an outside air and gas mixture in a blower assembly; and an exhaust pipe configured to move 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.

16 . The system of claim 15 , wherein the combustion area is on the outside of the supply chamber.

17 . The system of claim 15 , wherein the return cavity is located within the supply chamber such that the supply fuel, air, and flue-gas mixture does not mix with the return flue gas.

18 . The system of claim 15 , 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.

19 . The system of claim 18 , wherein the amount of return flue gas to recycle with the outside air and gas mixture in the blower assembly is determined by the oxygen content in the outside air and gas mixture.

20 . The system of claim 15 , 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

• F23C9/08 Primary

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

• F23C2202/50

  Control of recirculation rate · CPC title

• F23C7/008

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

• F24H1/145

  using fluid fuel · CPC title

• F23C2202/10

  Premixing fluegas with fuel and combustion air · CPC title