A fuel combustion system comprises a discharge nozzle with concentric fuel and air orifices. A fuel conduit is coupled to each fuel orifice for supplying liquid fuel thereto. An air conduit is coupled to each air orifice for supplying air thereto. The fuel and the pressurized air only mixing with one another, upon being discharged from the respective fuel and air orifices, to form a fuel mixture. A supplemental air source supplies supplement air to facilitate combustion. An air deflector sleeve at least partially surrounds and accommodates the at least one discharge nozzle and a cylindrical blast tube surrounding the air deflector sleeve and an outlet end of the cylindrical blast tube supports a flame retention head. The flame retention head redirects the supplement air radially inward, through openings in the air deflector sleeve and the flame retention head, to assist with combustion of the fuel mixture.

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.

A high efficiency natural draft gas burner that uses a plate attached to the burner tube to block secondary air from being introduced into a firetube or confined space vessel, ensuring that only inspired air nearly homogenously mixed with fuel is ignited at the burner tip. The venturi may be sized and shaped to ensure proper mixing of the inspired air and fuel, thus reducing emissions. This proper mixing combined with the lack of secondary air may reduce the fuel consumption and CO.sub.2 emissions of the burner by as much as 75%.

A solid-fuel burner includes: a venturi having a constricting portion where the transverse cross section of a fuel passage is reduced in a fuel nozzle for supplying a solid fuel; and a fuel concentrator for diverting the flow in the nozzle outward in the wake side of the venturi, and the nozzle is formed so that (a) the aperture in the vicinity of an opening portion of a boiler furnace wall surface has a flat shape, (b) cross-sectional shape thereof orthogonal to a nozzle center axis C on the outer peripheral wall of the nozzle is circular in a transverse cross section up to the constricting portion of the venturi, (c) a portion that has a gradually increasing degree of flatness is provided between the constricting portion and the opening portion, and (d) the flat shape in the opening portion is where the degree of flatness reaches a maximum.

A heating apparatus can have a sealed combustion chamber and a burner. The heating apparatus can have an air shutter that controls the amount of air that mixes with fuel directed toward the burner. The air shutter can be controlled by rotating a shaft that connects to the air shutter. The heating apparatus can also have a system of channels along its front face which direct air along the front face.

A method for delivering heating oil to homes and commercial establishments comprises a two-mode combination of (a) using a conventional large-tank delivery truck and (b) using a portable, self-contained apparatus which is carried on a lighter weight truck as cargo. The portable apparatus comprises a tank having just under 119 gallons capacity, a pump for flowing oil through a meter subsystem which measures the quantity of oil, to a hose; all mounted on a skid for portability. The apparatus is capable of dispensing oil quantities of 1, 5, or 25 gallons while meeting regulators' weights and measures approval requirements. When the small tank is filled with heating oil, preferred apparatus weighs less than 1500 pounds and is removably carried on the bed of an un-placarded truck (one that does not have to meet hazardous material requirements), and that may be driven by a driver having an ordinary driver's license, compared to the requirements and associated costs attending the conventional truck.

The invention relates to a recuperator (3) for a recuperative burner (1), said recuperator comprising a hot side and a cold side; a housing (31) which is closed in the circumferential direction and surrounds an exhaust gas channel (32) through which a flow can pass in the longitudinal direction; and a plurality of heat exchanger tubes located in the exhaust gas channel, wherein a first connection chamber (301) having a first supply connection (37) for combustion air and a second connection chamber (302) having a second supply connection (38) for a fuel gas are provided on the cold side of the exhaust gas channel (32), wherein the exhaust gas channel (32) is divided at least into a first segment (321) fluidically connected to the first connection chamber (301) and a second segment (322) fluidically connected to the second connection chamber (302), in each of which segments some of the heat exchanger tubes (33) are located and through which the exhaust gas can flow in parallel, the division of the exhaust gas channel being such that the ratio of the heat capacity flow of the cold side to the heat capacity flow of the hot side is between 0.9 and 1.1. The invention also relates to a recuperative burner (1).

A gas-burning appliance includes a combustor and a flow guide device engaged with the combustor. The combustor has a gas outlet. The flow guide device includes a separator and two stop plates. The separator has an opening. Each of the stop plates is located at the opening, and a top edge thereof is higher than a top surface of the separator. The combustor is located below the separator with the gas outlet corresponding to a space between the stop plates. The flow guide device has at least one first air inlet, which is located below the separator, and communicates with the space between the stop plates. A gas fireplace includes a firebox, a translucent shield, and the gas-burning appliance. A separator divides the firebox into an air chamber, which receives the combustor, and a combustion chamber. Whereby, the visibility of flame and the combustion efficiency could be improved.

A fuel injection assembly for a combustor of a gas turbine includes a fuel injector configured to couple to an outer sleeve of the combustor. A boss is configured to couple to a combustion liner of the combustor at a position axially and circumferentially aligned with the fuel injector. An insert is removably coupled to the boss. The insert includes a flange portion and an annular wall portion extending from the flange portion and defining a mixing channel. The insert defines a plurality of partial direct injectors spaced apart from one another and disposed about the mixing channel. A combustor including such a fuel injection assembly is also provided.

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.