A gas burner for burning a gas with a low calorific value. The gas burner may be for burning a synthesis gas issuing from the gasification of biomass.

A recuperative burner (10) fires a furnace chamber (11) in a substoichiometric manner. The recuperative burner is arranged in a radiant tube (26) which is open towards and protrudes into the furnace chamber. Together with the recuperator (18) or a protrusion (21), the radiant tube (26) forms an exhaust gas channel (19) into which burn-out air is introduced by an air conducting device (23). The post-combustion which occurs in the exhaust gas channel (19) heats the radiant tube (26). The furnace chamber (11) is heated partly directly by fuel and air and partly indirectly by the radiant tube (26). An excessive level of CO emission is prevented by the post-combustion in the exhaust gas channel (19). By using the resulting heat from the radiant tube (26), excessively high exhaust gas temperatures are prevented and the thermal use of the fuel is optimized.

Aspects provide for volatilizing a biomass-based fuel stream, removing undesirable components from the resulting volatiles stream, and combusting the resulting stream (e.g., in a kiln). Removal of particles, ash, and/or H2O from the volatiles stream improves its economic value and enhances the substitution of legacy (e.g., fossil) fuels with biomass-based fuels. Aspects may be particularly advantageous for upgrading otherwise low-quality biomass to a fuel specification sufficient for industrial implementation. A volatilization reactor may include a fluidized bed reactor, which may comprise multiple stages and/or a splashgenerator. A splashgenerator may impart directed momentum to a portion of the bed to increase bed transport via directed flow.

A biomass-mixed, pulverized coal-fired burner is provided. The biomass-mixed, pulverized coal-fired burner is capable of burning biomass fuel as auxiliary fuel in large quantities and burning only pulverized coal when the biomass fuel is not sufficiently available. The biomass-mixed, pulverized coal-fired burner includes: a biomass fuel jet nozzle that extends axially along the biomass-mixed, pulverized coal-fired burner; a pulverized coal fuel jet nozzle that surrounds the biomass fuel jet nozzle; a secondary air nozzle that surrounds the pulverized coal fuel jet nozzle; and a tertiary air nozzle that surrounds the secondary air nozzle. A biomass fuel stream is jetted into an inside of a pulverized coal fuel flame formed in a furnace, the flame offering favorable ignition and flame holding performance.

A burner barrel includes a concentric multi-tubular structure, formed by pipes and at the end downstream the burner barrel is provided a burner tip in which various nozzles to inject fuel and primary air are perforated. The burner tip includes at least one series of nozzles intended to inject an external air flow; a second series of nozzles intended to inject tangential air flow; and a third series of apertures intended to inject the fuel and transport air. The ends downstream of the first and second burner pipes are joined and define a continuous external annular surface of the burner tip. The nozzles are arranged within an inscribed area, being the dimension of the nozzles limited by a rate between the open area A of the nozzles and the complementary closed area A.

In staged combustion, wherein fuel is fed into a furnace, and less than all of the gaseous oxidant needed to completely combust the fuel is fed with the fuel and combusted, providing uncombusted fuel, and the remaining portion of gaseous oxidant needed to combust the fuel is fed into the furnace through a second port, fuel is fed and combusted at the second port to heat the second port and lessen the tendency of deposits to form at the second port.

Burner for an oven for reheating siderurlogical products such as billets, blooms or slabs, or for heat treatment oven, which is equipped with a fuel injection device and with an oxidant feed body feeding feed orifices with oxidant, the burner having an axial direction; the injection device is designed to provide a central injection of fuel via an orifice in, or parallel to, the axial direction of the burner; the oxidant feed body includes two sets of four oxidant feed orifices, each set including two orifices situated above a horizontal plane passing through the axial direction of the burner, and two orifices situated below this plane, the orifices of a second set being further away from the horizontal plane than those of the first set, the geometric axes of the orifices of the two sets making angles of inclination with respect to the axial direction of the burner.

The present invention provides a fuel incinerating system comprising a fuel injector, a multi-stage fuel-air mixing device comprising a plurality of fuel intake tubes stacked vertically and configured to provide annular gaps between one or more of the vertically stacked fuel intake tubes to entrain ambient air to form a fuel-air mixture; and a combustor in communication with the fuel-air mixing device and defining a combustion chamber and in communication with an ignition source. The combustor is configured to impede flow of the fuel-air mixture through the combustion chamber to achieve a desired retention time of the fuel-air mixture within the combustion chamber to achieve substantially complete combustions of the fuel.

A burner assembly for and method of producing ethylene having a mechanism to inject either primary fuel, staged fuel, or both by premix methods before combustion in a furnace. The burner assembly has at least one premix injection assembly for either exclusively primary fuel or exclusively staged fuel injection paired with a nozzle mix injection or injection means for primary and staged fuel both by premix methods. The primary fuel premix assembly associates with a burner tile that consists of multiple inlets and outlets connected by venturi channels to direct and combine combustion air and staged fuel coming from staged fuel orifice spuds. Primary fuel and combustion air are mixed in a premix assembly and directed inside the furnace, and above the burner tile to complete the reaction with the staged fuel and combustion air mixture in a combustion zone inside of the furnace.

A combustion burner for a boiler includes: an inner cylinder defining a fuel supply passage for supplying fuel; an outer cylinder surrounding the inner cylinder and defining an air supply passage between the inner cylinder and the outer cylinder; and a swirler in the air supply passage, the swirler being configured to swirl air in the air supply passage. The swirler includes a plurality of blades radially disposed between the inner cylinder and the outer cylinder, the plurality of blades extending from an air-supply side toward a combustion-space side of the air supply passage, and each of the plurality of blades having, at least on an inner cylinder side of the blade, a section with a thickness varied in a burner axial direction, the thickness being smaller at an edge portion on the combustion-space side than at a maximum-thickness section of the blade.