NOVELTY - The tuyere assembly comprises a refractory tuyere within a furnace wall, a pipe, a manifold, and an elongate bushing received within hollow interior space of the pipe for modifying the air flow within the pipe. The pipe has a first end, a second end opposed to the first end, and a body, which extends between the first end and the second end, in which the first end of the pipe resides within the wall of the furnace and the second end of the pipe resides externally of the furnace. The refractory tuyere is in fluid communication, with the first end of the pipe.    USE - The tuyere assembly is useful: for injection of air into a furnace; and in a cyclonic, staged oxidizer and a system for recycling biomass waste into useful ash recoverable heat energy (all claimed), where the biomass waste includes forest products, rice hulls, wood chips, waste coal tailings, bovine, swine, and poultry manures, animal carcasses and municipal, industrial and medical solid wastes.    ADVANTAGE - The tuyere assembly can be reliably, easily and economically manufactured with good quality and ensures efficient gasification of non-uniform biomass waste without formation of toxic by-product gases.    DETAILED DESCRIPTION - The tuyere assembly comprises a refractory tuyere within a furnace wall, a pipe, a manifold, and an elongate bushing received within hollow interior space of the pipe for modifying the air flow within the pipe. The pipe has a first end, a second end opposed to the first end, and a body, which extends between the first end and the second end, in which the first end of the pipe resides within the wall of the furnace and the second end of the pipe resides externally of the furnace. The refractory tuyere is in fluid communication, with the first end of the pipe. The manifold in fluid communication with the body of the pipe resides externally of the furnace. The second end of the pipe is provided with a selective closure means for selectively opening and closing the second end of the pipe. The selective closure means allows access to the hollow interior of the pipe. The manifold is provided with selective detachment means for selectively detaching the manifold from the pipe and the selective detachment means allows for cleaning, maintenance, and replacement of the manifold independently of the remaining components of the tuyere assembly. The bushing has an outer diameter, which is sized to allow the outer surface of the bushing to confront and abut the inner surface of the pipe, and is inserted and removed from within the pipe via the second end of the pipe when the selective closure means is open. INDEPENDENT CLAIMS are included for:    (1) a method of pyrolyzing biomass and solid wastes at temperatures below 1000 degrees F to obtain useable ash, heat energy and generate power using a gasification system;    (2) a cyclonic, staged oxidizer;    (3) a system for recycling biomass waste into useful ash recoverable heat energy; and    (4) an apparatus for high temperature draft control.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the system for pyrolyzing biomass to obtain useable ash and heat energy.    All-refractory, staged cyclonic oxidizer (3)    All refractory air-to-air indirect heat exchanger (4, 6)    Pyrolyzing gasifier (10)    Induced draft fans (11)    High temperature ejector assembly. (460)