Fuel-fired burner with internal exhaust gas recycle

A system, comprising:

• a burner housing, comprising:
• a second chamber, and
• a third chamber, wherein the second chamber and the third chamber are arranged concentrically within the burner housing, wherein the second chamber defines a jet pump arranged therein that extends inwardly towards the third chamber within the burner housing;
• and
• a plurality of recycle ports configured within the burner housing to provide exhaust gas to flow within the second chamber through an exhaust gas path, wherein a gap between the third chamber and the second chamber defines a plurality of recycle ports, wherein the exhaust gas path is bounded by an outside of the third chamber and an inside of the second chamber;
• a combustion air inlet of the burner housing configured to provide combustion air into the second chamber through a combustion air nozzle at an input to the second chamber within the burner housing;
• a gas mixing zone positioned within the burner housing, wherein the gas mixing zone is configured to mix the combustion air with the exhaust gas between an output of the combustion air nozzle and an input end of the third chamber, wherein the combustion air exiting the combustion air nozzle drives the jet pump to suck in the exhaust gas from the plurality of recycle ports to the gas mixing zone, and wherein a size of each recycle port of the plurality of the recycle ports is based on an amount of suction produced by the jet pump at a combustion air flow rate to suck the exhaust gas;
• and
• a discharge sleeve positioned downstream of the gas mixing zone and connected to the third chamber, positioned to receive a mixture of the exhaust gas and the combustion air through the third chamber to mix fuel with the mixture of the exhaust gas and the combustion air.

A system comprising:

• a second chamber, and
• a third chamber, wherein the second chamber and the third chamber are arranged concentrically within the burner housing, wherein the second chamber defines a plurality of recycle ports configured within a burner housing, wherein the plurality of recycle ports are configured to enable exhaust gas to flow within the second chamber through an exhaust gas path, wherein a gap between the third chamber and the second chamber defines a plurality of recycle ports, wherein the exhaust gas path is bounded by an outside of the third chamber and an inside of the second chamber;
• and a jet pump arranged within the burner housing;
• a combustion air fan of the burner housing configured to propel combustion air through a ducting and a combustion air inlet into the second chamber through a combustion air nozzle at an input to the second chamber within the burner housing;
• a gas mixing zone configured to receive the exhaust gas from the recycle port and the combustion air from the combustion air fan, wherein the gas mixing zone is positioned between a combustion air nozzle and an input end of the third chamber, wherein the gas mixing zone is configured to mix the exhaust gas with the combustion air, wherein the combustion air exiting the combustion air nozzle drives the jet pump to suck in the exhaust gas from the plurality of recycle ports to the gas mixing zone, and wherein a size of each recycle port of the plurality of the recycle ports is based on an amount of suction produced by the jet pump at a combustion air flow rate to suck the exhaust gas;
• and
• a burner nozzle to provide a flame resulting from a mixture of the exhaust gas and combustion air.