A dual fuel burner system includes a fuel burner housing and a main fuel supply conduit within the fuel burner housing. A main fuel nozzle is positioned proximate to a downstream end of the fuel burner housing and is in fluid communication with the main fuel supply conduit. The main fuel supply conduit is configured to provide 100% of the heat input requirement of the dual fuel burner system. A secondary fuel supply conduit is within the fuel burner housing. The secondary fuel supply conduit is configured to provide 100% of the heat input requirement of the dual fuel burner system. An air circuit is in fluid communication with an outlet of the main fuel nozzle. A direct spark ignitor is positioned proximate to the outlet of the main fuel nozzle.

A dual fuel burner system includes a fuel burner housing and a main fuel supply conduit within the fuel burner housing. A main fuel nozzle is positioned proximate to a downstream end of the fuel burner housing and is in fluid communication with the main fuel supply conduit. The main fuel supply conduit is configured to provide 100% of the heat input requirement of the dual fuel burner system. A secondary fuel supply conduit is within the fuel burner housing. The secondary fuel supply conduit is configured to provide 100% of the heat input requirement of the dual fuel burner system. An air circuit is in fluid communication with an outlet of the main fuel nozzle. A direct spark ignitor is positioned proximate to the outlet of the main fuel nozzle.

A combustor inlet mixing system (10) formed from a plurality of circumferentially spaced swirler vanes (38) extending radially outward from a nozzle hub. Each of the swirler vanes (38) may have a length (62) that extends downstream along at least a portion of the combustor inlet mixing system (10), and may further have a thickness (66) that extends along a circumference of the nozzle hub. At least one of the swirler vanes (38) may further have at least one slot (42) cut entirely through the thickness (66) of a portion of the swirler vane (38). The slot (42) may separate the swirler vane (38) from the nozzle hub along a portion of the length (62) of the swirler vane (38).

Described herein are two-stage catalytic heating systems and methods of operating thereof. A system comprises a first-stage catalytic reactor and a second-stage catalytic reactor, configured to operate in sequence and at different operating conditions, For example, the first-stage catalytic reactor is supplied with fuel and oxidant at fuel-rich conditions. The first-stage catalytic reactor generates syngas. The syngas is flown into the second-stage catalytic reactor together with some additional oxidant. The second-stage catalytic reactor operates at fuel-lean conditions and generates exhaust. Splitting the overall fuel oxidation process between the two catalytic reactors allows operating these reactors away from the stoichiometric fuel-oxidant ratio and avoiding excessive temperatures in these reactors. As a result, fewer pollutants are generated during the operation of two-stage catalytic heating systems. For example, the temperatures are maintained below 1.000° C. at all oxidation stages.

A device is disclosed herein which provides a domed cover of a combustion chamber enclosure applicable for use in Stirling Cycle engines, Ericsson Cycle engines, Rankine Cycle engines or other external combustion heat engine types which allows for the free flow of combustion air from the outer margins of the device toward the combustion air inlet in a vortexual fluid flow to achieve a more balanced stoichiometric ratio of the fuel/air mixture before ignition. This may be achieved by the employment of vanes to direct combustion air in a swirling vortexual flow as the combustion air enters the combustion chamber. Thermal barrier coatings and insulative materials may also be employed to minimize parasitic heat loss.

Some embodiments of the disclosure provide a steam generator and a car washer with the steam generator. The steam generator includes: a boiler having a combustion chamber. The steam generator further includes: a windproof cover, at least a part of an ignition device of the steam generator being located in the windproof cover; an igniting cover, at least a part of the igniting cover being located in the combustion chamber, and an outlet of the windproof cover being located in the igniting cover; an air inlet grating, the air inlet grating being provided around the windproof cover and connected with the windproof cover, and the air inlet grating being located on an inner side of an air inlet of the igniting cover, to prevent airflow in the igniting cover from flowing out from the inlet of the igniting cover.

Some embodiments of the disclosure provide a steam generator and a car washer with the steam generator. The steam generator includes: a boiler having a combustion chamber. The steam generator further includes: a windproof cover, at least a part of an ignition device of the steam generator being located in the windproof cover; an igniting cover, at least a part of the igniting cover being located in the combustion chamber, and an outlet of the windproof cover being located in the igniting cover; an air inlet grating, the air inlet grating being provided around the windproof cover and connected with the windproof cover, and the air inlet grating being located on an inner side of an air inlet of the igniting cover, to prevent airflow in the igniting cover from flowing out from the inlet of the igniting cover.

Provided is a water heater including a burner that receives a supply of combustion air from a fan, a heat exchanger having a heat transfer tube, and a combustion chamber case in which a combustion chamber of the burner is formed in the interior thereof and which is to be capable of guiding combustion gas generated by the burner to the heat exchanger. The water heater further includes a unit case that surrounds the combustion chamber case, and a region on the outside of the combustion chamber case within the unit case serves as an air pressure chamber having a higher pressure than the combustion chamber. Thus, combustion gas leakage to the outside can be prevented or suppressed appropriately by means of a simple configuration.

A double swirl burner including an annular air nozzle, an annular fuel nozzle coaxially disposed within the annular air nozzle, and a central air nozzle coaxially disposed within the annular fuel nozzle. An annular air nozzle may include at least one first inlet port on a peripheral wall of the annular air nozzle, where the first inlet port may be configured to allow for tangentially injecting a first air stream into the annular air nozzle. A first air stream may be tangent to a circular cross-section of the exemplary annular air nozzle, and a first axial inlet that may be configured to allow for axially injecting a second air stream into the annular air nozzle along a centerline of the annular air nozzle.

A nozzle (1) is configured to deliver gas into an incinerator such as a waste incinerator (3). The nozzle includes a nozzle pipe (20) and a swirl generator (21). The swirl generator includes a plurality of angularly spaced vanes (24) that are attached to an inner surface (19) of the pipe. The vanes terminate radially inwardly at respective vane inner surfaces (36). A continuous central passage (25) extends axially between the vane inner surfaces. Utilization of the swirl nozzles in connection with an incinerator provide improved gas mixing and avoid having regions with insufficient air to achieve complete combustion.