Abstract: A ceramic recuperator for the heating of combustion air, e.g. for an oil-fired burner or boiler, which prepares at least the air in the formation of a fuel-air mixture which is ignitable at the burner. According to the invention the recuperator is provided with means, especially electrically operated for heating the ceramic body so that the initial combustion air can be heated before firing of the burner and the further heating of the recuperator by combustion products.

Abstract: A superconductive coil assembly has a housing formed of an inner shell and an outer shell, and a superconductive coil situated in a space defined between the shells. A plurality of spring elements arranged in a mosaic-like pattern on a surface area of one of the shells between the superconductive coil and the shell. Each spring element has a first flat member being of a material having a relatively small dilatation and a second flat member being of a material having a relatively large dilatation. The first and second flat members are inseparably bonded to one another. The spring elements have an effective thickness that is greater at a relatively low temperature than at a relatively high temperature.

Abstract: A burner head of ceramic materials through which the fuel (combustible) and the oxidizing agent (oxygen or oxygen-containing gas such as air) are passed from an inlet side to an outlet side, combustion being effected at the outlet side. According to the invention, the gas passages for the fuel and the oxidizing medium are of elongated cross section and parallel to one another, being offset in pairs so that indirect heat exchange is effected between the two mediums through the separating ceramic wall. The passages can be formed as rectangular-section channels which are closed at the top and bottom by ceramic plates.

Abstract: A filter for the removal by the exchange effect of fission products from the coolant, generally helium, of a nuclear reactor comprises a gas-tight duct containing at least one coil of corrugated metal strip, the coil being formed from two strip layers whose corrugations are mutually crossing.

Abstract: A core energy plant with closed working gas circuit, in which within an or safety container there are arranged a reactor core of pre-stressed concrete for heating the working gas, a working gas driven turbo-set with generator, and other components of the working gas circuit such as heat exchanger and gas storage means. The reactor core is separated from the turbo-set and other components and is arranged in a separate reactor chamber with walls of pre-stressed concrete, while the other components are respectively arranged in separate chambers, within an inner concrete container which has chambers for receiving the turbo-set with generator and the remaining components of the working gas circuit and which has its outer wall arranged adjacent the vertical inner wall of the outer safety container there is provided a recess for a pre-stressed concrete container for receiving the reactor core.

Abstract: The invention relates to a recuperative heat exchanger comprising an elongate rotationally symmetric body of ceramic material having radially outwardly extending, flow channels of slot like cross-section extending along the axis of the body. Alternate flow channels extend further toward the surface of the body and further toward the axis of the body, respectively. Inlet and outlet openings are provided for the flow channels about at the ends of the body. The invention also comprises a process for making such a heat exchanger, including extruding ceramic material through an extrusion nozzle with a free cross-section in which core bodies are shaped and positioned for generating the flow channels and inner and outer cover walls defining the flow channels. The invention further comprises the extrusion nozzle in which the process is performed.

Abstract: A burner system in which an ignitable mixture is formed from vaporized liquid fuel and preheated air which is heated by recuperative heat exchange with a furnace exhaust gas from the combustion chamber in which the mixture burns. According to the invention, a feed line for the fuel opens into a closed chamber provided with porous walls permeable to the fuel and with a flow passage traversed by the preheated air, the wall of this flow passage in turn serving for indirect heat exchange of the air by the combustion gases of the furnace.

Abstract: A heat exchanger of a ceramic body, or the like, having a plurality of elongate flow passages in parallel relationship with the placement of the passages staggered with respect to the opposite end cover walls of the ceramic body, transversely extending parts of both cover walls being absent to expose those staggered passages that pass closer to the respective cover wall, thereby to permit access for fluid media to the flow passages; particular characteristic features of the passages are disclosed.

Abstract: A heat exchanger element, especially of undulating or folded configuration aving an end closure thereon in the form of a band shaped in conformity with the heat exchanger element and sealingly connected thereto while the legs of the undulations of the band which face each other are also sealed together. In one form of the invention, the band is spaced from the end of the heat exchanger element and the open ends of the undulations are sealed as with solder.

Abstract: A primary working gas is heated in a high-temperature nuclear reactor and ives at least one primary turbine set to operate an electrical generator to generate electric power. Heat is abstracted from the primary gas by recuperative heat exchange and the primary gas is compressed and heated by the recuperative heat exchange and introduced into the nuclear reactor for further heating therein. Upon the development of an increased electrical power demand, a secondary gas is heated by the recuperative heat exchange and drives an auxiliary turbine set and electric power generator to supply this peak demand.

Abstract: Elongated ceramic heat exchange units are arranged with each such unit axly oriented and all arranged parallel to each other in a ring surrounding the compressor, gas turbine and combustion chamber of a gas turbine motor. Each heat exchange unit has a multiplicity of rectangular slot channels through alternate ones of which the hot exhaust gas and the compressed air supply flow in counter-current. The cross sections of these channels all have their long dimension disposed substantially radially with respect to the axis of symmetry common to the principal components. The respective inputs for the two sets of channels are both from the inside of the ring arrangement but at opposite ends of each heat exchanger element; whereas the exit openings are in the end faces of the heat exchanger elements.

Abstract: The heat exchanger elements, arranged in a ring around a compressor, gas bine and combustion chamber that have a common axis of symmetry, are supported on a framework having elastic inserts for compensating for or accommodating to thermal stresses and are so connected to an inner and an outer casing portion that free spaces for each of the heat exchanging media (hot exhaust gas and compressed air) are provided inside the unit communicating with the heat exchanger elements. Ducts for the hot gases are surrounded by cooler gases provided in these free spaces to reduce thermal stresses. The casing portions themselves provide some of the duct walls, so that a compact and sturdy unit is provided.

Abstract: Two identically folded strips enclose an intermediate space accessible at e edges of the strip, and the fold cavities opening to the outside of the strip structure are closed off at the strip edges and covered by outside cover plates over their central portions, so that one medium may be caused to flow through each of the sets of outside fold cavities and a third medium through the intermediate space. The third medium flows countercurrent to the direction of flow of the other two. Modules of four such matrices utilize inlet and outlet ducts so that the two or four matrices in a compact modular structure can be structurally repeated in accordance with the number of modules desired in the particular application. The inlet and outlet ducts have tapering flow cross-sections.

Abstract: Heat exchanger matrices of the folded strip type are set in an elongated V onfiguration inside a tubular casing. They are held in position by braces between opposite cover plates and between other cover plates and the casing, which braces also operate as partition walls for separating inlet and outlet channels of one of the media. The cooler of the media has inlet ducts downwards on the edges of the space inside the V and an outlet duct for upward flow at the center of the space inside the V. The other medium, which is hotter, but under less pressure, has inlet ducts with upward flow at the center of the spaces outside the V and outlet ducts with downward flow at the edges of the spaces outside the V. The hotter parts of the heat exchanger are in the middle of the structure. Bellows-type thermal expansion compensators seal the edges of the V against the casing.

Abstract: A nuclear energy plant with a closed circuit for the working gas, in which nuclear reactor operable to heat up the working gas, is through a plurality of gas conduits arranged in parallel, connected to a plurality of turbo-sets for generating electric energy and to circuit components following the turbo-sets. One turbo-set each and the respective circuit components associated therewith are respectively arranged in common structural units which are radially arranged around the nuclear reactor. Each of the structural units comprises a first connection for a hot gas conduit withdrawing the heated working gas from the reactor and a second connection for a cold gas conduit for conveying the working gas to the nuclear reactor after the working gas has passed through the respective circuit components.

Abstract: A heat exchanger arrangement for the exchange of heat between fluid media which the wall through which the heat is exchanged between the media is a pleated element which has a respective medium flowing along each side thereof, preferably in counterflow relation.

Abstract: A nuclear power-generating installation comprises three power-generating bines which are operated by three partial gas streams heated in separate passages of a nuclear reactor. After traversing the power-generating turbines the partial gas streams are cooled in respective recuperative heat exchangers to recover residual useful heat therefrom and are combined into a lesser number of gas streams each of which is subjected to at least two compression stages with at least one intervening cooling stage in which all of the gas is combined to flow as a total gas stream through at least one such cooler. Following the last compression stage the gas is again subdivided into three partial streams for preheating in the aforementioned recuperative heat exchangers before traversing the nuclear reactor for the main heating.