Abstract: This invention is a system for recovering resources from sludge in which sludge including water of 90 to 70 percent is first supplied to a sludge concentrator invented by the inventor through a forced supply equipment where the sludge is concentrated to have water content up to about 60 percent; then is sent to a drying furnace having a fluidized sand bed.A product yielded in the said drying furnace is separated to gas and solid. After the separated gas is pressurized by a fan and is heated by a heat exchanger through a circulation passage, a required part thereof is supplied to the drying furnace as gas for drying and the remainder is sent to the said sludge concentrator. After the water content is removed from the gas concentrated and the gas yielded by the said sludge concentrator is used in the system as gaseous fuel.

Abstract: An evaporative concentrator for sewage sludge installed between hopper A and drying furnace C; the one set consisting of heating chamber B.sub.1 and evaporation chamber B.sub.2 having a construction so that the said one set or several sets are provided in series.Sewage sludge in the hopper-type bottom of evaporating chamber B.sub.2 is pressurized and sent into sewage sludge pass-way 42 in heating chamber B.sub.1 by compulsory supply means 48, the sewage sludge is heated in heating chamber B.sub.1, the pressurized and heated sewage sludge is led to the upper space of evaporating chamber B.sub.2, a part of the water content is vaporized by allowing the said sewage sludge to be sprayed into the said upper space in which the pressure is lowered, the steam is taken out of the system through exhaust gas pipe 46 having condenser 47 at the end, the sewage sludge somewhat cooled by evaporative latent heat removed is recovered in the hopper of evaporating chamber B.sub.

Abstract: The incineration system consists of a sludge dryer, a cyclone separator unit, an incomplete combustion incinerator, a complete combustion incinerator with a heat exchanger, a heat exchanger and so forth and comprises gas circulation passage involving the units above in order to burn sewage sludge economically without any additional fuel except for starting up thereof, with stable heat balancing in spite of change in fed sludge rate and with reduced NOx in the exhaust gas from the incineration system.

Abstract: Fuel is injected into a combustion chamber by a central burner. Combustion air is fed through an air supply passage provided in a plurality of air ejection holes on an annular plate surrounding the front end of said air supply passage.

Abstract: This invention relates to a combustion apparatus provided with a multiple of burners, a annular burner tile structure which is of rectangular section, combustion air passages along the major walls of the burner tile structure, and a series of air inlet holes or an air inlet slit for the purpose of introducing air into the burner tile structure to control the deflection of fuel stream.The fuel injected into the burner tile structure at a velocity near to sonic velocity generates Coanda Effect and induces high temperature combustion gas into the burner tile structure from the combustor.This high temperature combustion gas promotes endothermic gasification of fuel prior to the introduction of combustion air into the fuel stream so that complete and uniform combustion is performed under the existence of less combustion air as compared with the combustion in the conventional combustion apparatus, therefore, flame temperature is reduced and consequently, NOx generating rate is remarkably reduced.

Abstract: A vented nuclear fuel element having a plenum for accumulation of fission product gases and plug means for delaying the release of the fission product gases from the plenum, the plug means comprising a first porous body wettable with a liquid metal and a second porous body non-wettable with the liquid metal, the first porous body being impregnated with the liquid metal and in contact with the liquid metal.