US 11,732,886 B2
Fuel-fired burner with internal exhaust gas recycle
Curtis Lynn Taylor, Paradise Valley, AZ (US); Umesh Chandra Bhayaraju, Anderson, IN (US); and Bradley Dean Patterson, Dunkirk, IN (US)
Assigned to HONEYWELL INTERNATIONAL INC., Charlotte, NC (US)
Filed by Honeywell International Inc., Morris Plains, NJ (US)
Filed on Nov. 24, 2020, as Appl. No. 17/103,123.
Prior Publication US 2022/0163197 A1, May 26, 2022
Int. Cl. F23C 9/00 (2006.01); F23D 11/40 (2006.01); F23D 17/00 (2006.01)
CPC F23C 9/006 (2013.01) [F23D 11/402 (2013.01); F23D 17/002 (2013.01); F23C 2202/30 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method, comprising:
providing a fuel-fired burner comprising a burner housing having a fuel inlet coupled to a fuel pipe coupled to a burner nozzle secured to a burner mounting plate that has at least one recycle port, a combustion air inlet for receiving combustion air coupled to a combustion air nozzle positioned beginning at an input to a second chamber within the burner housing having an output spaced apart from a third chamber also within the second chamber, wherein the combustion air nozzle is configured to direct the combustion air into the third chamber, and a jet pump is located entirely inside the burner housing;
directing the combustion air using a combustion air fan from the combustion air inlet through the combustion air nozzle;
directing fuel through the fuel pipe to the burner nozzle to implement a combustion process that generates a flame originating at the burner nozzle which generates a hot exhaust gas, and
operating the jet pump by flowing the combustion air through the combustion air nozzle with a sufficient velocity for creating an impulse that suctions in the hot exhaust gas through the recycle port into the second chamber then into a gas mixing zone extending from an output of the combustion air nozzle to an input end of the third chamber which mixes the hot exhaust gas suctioned in with the combustion air received from the combustion air nozzle, wherein an area ratio of the third chamber to the output of the combustion air nozzle is 1.2 to 3.