Abstract: A combustor is provided having a variable dome valve on the upstream end of the flame tube thereof for controlling admission of a stream of combustion air to said flame tube.

Abstract: Apparatus for burning gaseous and liquid fuels in a furnace, to retard formation of NO.sub.x, comprising a fuel tube of selected length and diameter, closed at the end which is inserted into a combustion zone. There are a plurality of ports drilled in the closed end of the fuel tube, the axes of which lie on a conical surface coaxial with the fuel tube. The fuel tube is inserted coaxially into a burner tube of selected larger diameter, and the distant ends are substantially coplanar. A plurality of jets of low pressure steam are injected through a plurality of ports into the annular space between the fuel tube and the burner tube at the outer end of the burner tube. The steam jets flowing through the ports induce a flow of primary combustion air, which mixes with the steam and flows down the annular space to mix with the high velocity jets of fuel as they emerge from the ports on the fuel tube. The fuel, air, and steam mix together prior to entering the combustion reaction zone.

Abstract: A burner includes a plurality of air nozzles open toward a furnace and which are disposed unsymmetrically with respect to the central axis of the burner and so combined that the velocity of combustion air to issue from one or more of the nozzles is higher than the mean air velocity through the total air nozzle opening area and the velocity of combustion air from the rest of the nozzles is lower than the mean velocity. The opening area of the lower-velocity air nozzle or nozzles accounts for from 30 to 60% of the total opening area. A fuel nozzle or nozzles are located within or adjacent the lower-velocity air nozzle or nozzles. The amount of air to issue from the lower-velocity air nozzle or nozzles is not more than 70% of the theoretical air for the fuel to jet out of the burner.

Abstract: Apparatus for burning a product gas having a low BTU content wherein a single burner is adapted to burn the low energy gas alone with the turndown capability of a multi-burner arrangement. The gas flow is separated into two independent flow streams with one flow stream being exhausted into a primary air stream and the other into a secondary air stream prior to combustion. A common control means responsive to changes in load is provided to modulate the secondary air stream and its associated gas stream whereby at decreasing loads proportionately increased amounts of air and gas are directed through the primary air and gas streams.

Abstract: A combustor adapted for use in a gas turbine engine comprising a combustion prechamber zone, a main combustion chamber zone and a dilution air zone including a system for introducing a premixed fuel-air mixture with elevated inlet air temperatures which allows the thermal efficiency of the engine to be increased without a corresponding increase in the percentage of oxides of nitrogen in the combustion products.

Abstract: A variable valve is provided for mounting on the end of a tubular conduit for controlling fluid flow through said conduit. Said valve is particularly well adapted to be employed as a dome valve on the upstream end of a flame tube of a combustor for controlling admission of a stream of combustion air to said flame tube.

Abstract: A combination oil and gas burner is shown with the noise attendant upon the delivery of the primary and secondary air for combustion and the noise of the combustion muffled or suppressed by sound absorbing material disposed to reduce sound transmission to a low level.

Abstract: A method and an apparatus for the combustion of high viscosity low grade liquid fuel (e.g., residual oil), in which the fuel is directed through an ejector into an impact chamber in which it impinges upon a baffle with the rebounding fuel particles being further pulverized by jets of air introduced into this chamber with an inclination to the axis of the burner. The resulting fuel-air mixture passes around the impingement baffle with a laminar flow of air passing axially along the wall of this chamber and preventing precipitation of fuel droplets thereon. Upon emergence from the chamber the fuel-air mixture encounters a flow of air passing along the exterior of the impact chamber and intercepted by a plurality of inwardly extending steps which furtherpromote pulverization and mixing.