Abstract: A solid fuel burning system which may be readily combined with a conventional fluid fuel burning furnace in a forced air heating system. The solid fuel burning system comprises, in combination, a draft inducing blower which directs air for combustion into the furnace at a point proximate the burning fuel. Baffle walls are provided which separate the smoke and other products of combustion from the clean air to be heated and a novel heat exchanger comprised of a plurality of elongated tubes provide a relatively large heat transfer surface. The furnace is specifically designed to facilitate periodic cleaning of the interior walls of the heat exchanger where creosote and other products of combustion may accumulate. In addition, the system employs a novel electronic control circuit which is tied in with the room thermostat and with a thermocouple disposed within the solid fuel burning furnace.

Abstract: A furnace for waste material. The furnace has a central chute for receiving he waste material, and a combustion chamber which is arranged below the chute and has a closed bottom. The transition between the central chute and the combustion chamber is designed as a constriction in such a way that the waste material remains above the constriction in the central chute for drying and degasification up to the point of combustion. Essentially, only ashes pass through the constriction downwardly into the combustion chamber. The gases which are withdrawn downwardly out of the chute are also guided through the constriction into the combustion chamber. Fresh air supply lines discharge at the constriction and in the lower portion of the chute above the constriction. The flue gases formed in the combustion chamber are guided to a flue through discharge openings in the exhaust chamber of the combustion chamber. The exhaust chamber is designed in such a way that it surrounds the central chute.

Abstract: An elongate combustion chamber is inclined at a 50.degree. to 80.degree. angle to the vertical, is connected at the lower end face to a feed duct through which fuel is pushed into the chamber and is open at the upper end face. The side walls forming the lower part of the chamber are downwardly converging and the free edges are spaced from each other at a distance decreasing in the direction of the open upper end face from the lower end face to form a primary air opening from a primary air channel therebeneath, the tapered opening covered by corresponding downwardly converging solid side walls connected at an apex and spaced from the other walls to form an air passage therebetween from the primary air channel to the combustion chamber.

Abstract: Fireplace furnace apparatus includes separate air systems for combustion and for heating and the combustion gases flow from a primary combustion chamber into a secondary combustion chamber and into additional settling chambers for particulate matter and the heated air flows through finned chambers adjacent the chambers through which the combustion air flows.

Abstract: An improved waste material incineration system and method of combustion where waste material is initially inserted through gravity assist into the combustion zone of a horizontally directed furnace. The waste material is impinged by the flame front of a burner and is cyclically vortexed in a vortexing zone of the combustion chamber through a combination of air inlet conduits impinging on the combusting waste material and the particular contouring of the furnace internal geometry. The waste material is initially densified in one section of the vortexing zone and then expanded in a second section of the vortexing zone while being impinged by inlet air to provide a guide to maintain the vortexing contour of the combusting waste material.

Abstract: A waste incinerator system, particularly suitable for bulk waste contaminated with radioactivity, is provided with a primary, upright combustion chamber with a removable, frusto-conical bottom section. The chamber is of the type having a double shell with cooling air passage therethrough. The cooling air is introduced at two different, vertically spaced levels, whereby the temperature control of the double shell can be effected by selectively controlling the volume of air incoming at the two levels. Only the bottom, frusto-conical removable portion of the combustion chamber is provided with refractory lining, the remainder of the chamber having a heat resistant steel inside wall, whereby the build-up of radioactivity levels within the chamber is reduced. The refractory of the frusto-conical bottom portion of the chamber is replaceable.