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A venturi nozzle for a gas combustor includes an orificed gas nozzle, a venturi tube and one or more support members. The orificed gas nozzle has a longitudinal axis, an inlet and an outlet. The venturi tube is aligned with the longitudinal axis and has an entrance proximate to the outlet of the ori

A venturi nozzle for a gas combustor includes an orificed gas nozzle, a venturi tube and one or more support members. The orificed gas nozzle has a longitudinal axis, an inlet and an outlet. The venturi tube is aligned with the longitudinal axis and has an entrance proximate to the outlet of the orificed gas nozzle and an exit. The support member(s) are attached between the orificed gas nozzle and the venturi tube to create a gap between the venturi tube and the orificed gas nozzle. In some embodiments, two or more venturi nozzles can be combined together in various configurations into a nozzle assembly or multi-nozzle gas combustor and attached, mounted or disposed within a stack, chimney or vented enclosure. The wall(s) of the stack, chimney or vented enclosure may include one or more openings, cut outs or vents to provide primary and secondary air to the venturi nozzles.

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1. A venturi nozzle for a gas combustor comprising: an orificed gas nozzle having a longitudinal axis, an inlet and an outlet having a larger diameter than the inlet;a venturi tube aligned with the longitudinal axis and having an entrance proximate to the outlet of the orificed gas nozzle and an exi

1. A venturi nozzle for a gas combustor comprising: an orificed gas nozzle having a longitudinal axis, an inlet and an outlet having a larger diameter than the inlet;a venturi tube aligned with the longitudinal axis and having an entrance proximate to the outlet of the orificed gas nozzle and an exit;one or more support members attached between the orificed gas nozzle and the venturi tube that create a gap between an interior of the entrance of the venturi tube and an exterior of the outlet of the orificed gas nozzle; andwherein a gas exiting the outlet of the orificed gas nozzle provides a motive force that induces a flow of air into the entrance of the venturi tube that mixes with the gas within the venturi tube forming a gas-air mixture, and the gas-air mixture further mixes with an air outside the exit of the venturi tube when ignited to complete combustion of the gas. 2. The venturi nozzle as recited in claim 1, wherein the outlet of the orificed gas nozzle is either disposed within the entrance of the venturi tube or separated and spaced apart from the entrance of the venturi tube along the longitudinal axis. 3. The venturi nozzle as recited in claim 1, wherein the one or more support members comprise a tapered cylinder having two or more openings. 4. The venturi nozzle as recited in claim 1, wherein the gas-air mixture further comprises a flue or exhaust gas. 5. The venturi nozzle as recited in claim 1, further comprising a pilot or igniter disposed proximate to the exit of the venturi tube. 6. A multi-nozzle gas combustor comprising: three or more venturi nozzles, each venturi nozzle comprising: an orificed gas nozzle having a longitudinal axis, an inlet and an outlet having a larger diameter than the inlet,a venturi tube aligned with the longitudinal axis and having an entrance proximate to the outlet of the orificed gas nozzle and an exit, andone or more support members attached between the orificed gas nozzle and the venturi tube that create a gap between an interior of the entrance of the venturi tube and an exterior of the outlet of the orificed gas nozzle;a main manifold;one or more manifolds connected to the inlet of each orificed gas nozzle, wherein the one or more manifolds comprise a first branch manifold, a second branch manifold, a third branch manifold, a fourth branch manifold, and a fifth branch manifold, wherein all the branch manifolds are connected to the main manifold and are substantially equally spaced apart and parallel to one another;the three or more venturi nozzles are equally spaced apart from one another and arranged in at least two sets that are offset from one another;the at least two sets comprise a first set of venturi nozzles connected to the first branch manifold, a second set of venturi nozzles connected to the second branch manifold, a third set of venturi nozzles connected to the third branch manifold, a fourth set of venturi nozzles connected to the fourth branch manifold, a fifth set of venturi nozzles connected to the fifth branch manifold;the first set of venturi nozzles, the third set of venturi nozzles and the fifth set of venturi nozzles each contain five venturi nozzles that are equally spaced apart from one another; andthe second set of venturi nozzles and the fourth set of venturi nozzles each contain six venturi nozzles that are equally spaced apart from one another and offset from the first set of venturi nozzles, the third set of venturi nozzles and the fifth set of venturi nozzles. 7. The multi-nozzle gas combustor as recited in claim 6, wherein the outlet of the orificed gas nozzle is either disposed within the entrance of the venturi tube or separated and spaced apart from the entrance of the venturi tube along the longitudinal axis. 8. The multi-nozzle gas combustor as recited in claim 6, wherein the one or more support members comprise a tapered cylinder having two or more openings. 9. The multi-nozzle gas combustor as recited in claim 6, wherein a gas exiting the outlet of the orificed gas nozzle provides a motive force that induces a flow of air into the entrance of the venturi tube that mixes with the gas within the venturi tube forming a gas-air mixture, and the gas-air mixture further mixes with an air outside the exit of the venturi tube when ignited to complete combustion of the gas. 10. The multi-nozzle gas combustor as recited in claim 9, wherein the gas-air mixture further comprises a flue or exhaust gas. 11. The multi-nozzle gas combustor as recited in claim 6, further comprising a pilot or igniter disposed proximate to the exit of the venturi tube of one of the venturi nozzles. 12. The multi-nozzle gas combustor as recited in claim 6, wherein the multi-nozzle gas combustor is disposed within a stack, chimney or vented enclosure. 13. The multi-nozzle gas combustor as recited in claim 12, further comprising one or more primary air openings, cut outs or vents within a wall of the stack, chimney or vented enclosure that provide a primary air to the multi-nozzle gas combustor. 14. The multi-nozzle gas combustor as recited in claim 12, further comprising one or more secondary air openings, cut outs or vents within a wall of the stack, chimney or vented enclosure that provide a secondary air to the multi-nozzle gas combustor. 15. A burner system comprising: a stack, chimney or vented enclosure having a top and a bottom;a multi-nozzle gas combustor disposed within and proximate to the bottom of the stack, chimney or vented enclosure, the multi-nozzle gas combustor comprising: three or more venturi nozzles, each venturi nozzle comprising an orificed gas nozzle having a longitudinal axis, an inlet and an outlet having a larger diameter than the inlet, a venturi tube aligned with the longitudinal axis and having an entrance proximate to the outlet of the orificed gas nozzle and an exit, and one or more support members attached between the orificed gas nozzle and the venturi tube that create a gap between an interior of the entrance of the venturi tube and an exterior of the outlet of the orificed gas nozzle,one or more manifolds or a gas chamber connected to the inlet of each orificed gas nozzle, andthe three or more venturi nozzles are equally spaced apart from one another and arranged in at least two sets that are offset from one another; andone or more gas recirculation tubes connected to an upper portion of the stack, chimney or vented enclosure and the gas inlet, the gap or both. 16. The burner system as recited in claim 15, further comprising one or more primary air openings, cut outs or vents within a wall of the stack, chimney or vented enclosure that provide a primary air to the multi-nozzle gas combustor. 17. The burner system as recited in claim 15, further comprising one or more secondary air openings, cut outs or vents within a wall of the stack, chimney or vented enclosure that provide a secondary air to the multi-nozzle gas combustor. 18. The burner system as recited in claim 15, further comprising one or more gas capture units that extend into the stack, chimney or vented enclosure and are attached to the one or more recirculation tubes in the upper portion of the stack, chimney or vented enclosure. 19. The burner system as recited in claim 18, wherein the one or more gas capture units comprise a vent wall along an entire inner perimeter of the stack, chimney or vented enclosure that forms an annular space or gap between the vent wall and an interior surface of the stack, chimney or vented enclosure. 20. The burner system as recited in claim 15, wherein the outlet of the orificed gas nozzle is either disposed within the entrance of the venturi tube or separated and spaced apart from the entrance of the venturi tube along the longitudinal axis. 21. The burner system as recited in claim 15, wherein the one or more support members comprise a tapered cylinder having two or more openings. 22. The burner system as recited in claim 15, wherein a gas exiting the outlet of the orificed gas nozzle provides a motive force that induces a flow of air into the entrance of the venturi tube that mixes with the gas within the venturi tube forming a gas-air mixture, and the gas-air mixture further mixes with an air outside the exit of the venturi tube when ignited to complete combustion of the gas. 23. The burner system as recited in claim 22, wherein the gas-air mixture further comprises a flue or exhaust gas. 24. The burner system as recited in claim 15, further comprising a pilot or igniter disposed proximate to the exit of the venturi tube of one of the venturi nozzles.