Abstract: A method and burner for combusting fuels having a heating value of <80 BTU/scf (<2.98 MJ/Nm3) in which the fuel premixed with air is injected into a porous inert media so that the fuel is combusted with the air. Oxygen may be optionally injected into the porous inert media separately from the premixed air/fuel.

Abstract: Solid particulate fuels are combusted with a primary oxidant stream of industrially pure oxygen and a secondary oxidant stream of industrially pure oxygen optionally mixed with a portion of recycled flue gas. The fuel is conveyed with a carrier gas of air or recycled flue gas. An oxygen concentration out of the total amount of the fuel stream and the primary and secondary oxidant streams is 40-63% by mass or 47-70% by volume.

Abstract: A splitter divides a flow of low heating value biomass into a central stream and an annular stream. A stable flame may be achieved by combusting the central stream with oxygen. This avoids the use of costly fossil fuels or biomass (that have higher heating values than the biomass fuel) as an auxiliary fuel for achieving a stable flame.

Abstract: Solid particulate fuels are combusted with a primary oxidant stream of industrially pure oxygen and a secondary oxidant stream of industrially pure oxygen optionally mixed with a portion of recycled flue gas. The fuel is conveyed with a carrier gas of air or recycled flue gas. An oxygen concentration out of the total amount of the fuel stream and the primary and secondary oxidant streams is 40-63% by mass or 47-70% by volume.

Abstract: The invention relates to a combustion tool including a quarl block made of refractory material, the quarl block defining a quarl exit and a passage between the entry surface and quarl block, said tool including an injector of oxidizer and/or fuel that extends through the passage and opens into the quarl block, and also including a sheath that surrounds the injector in the passage section.

Abstract: A burner recessed from a combustion space in a burner block adjacent the combustion space injects a secondary reactant (a second portion of a first reactant) around and upstream of a stream of a primary reactant (a first portion of the first reactant) and a stream of a second reactant in order to prevent or inhibit deposition of material from recirculating gases in the combustion space upon the burner. The first reactant is one of a fuel and an oxidant while the second reactant is the other of a fuel and an oxidant. The secondary stream may be injected from a continuous annulus formed in an outer body of the burner or from a plurality of radially spaced holes formed in the outer body. The primary stream is injected from one of an inner bore formed in an inner body of the burner and a reactant annulus defined between the inner and outer bodies while the second reactant is injected from the other of the inner bore and the reactant annulus.