Abstract:
An interconnector for high-temperature fuel cells is characterized in that the interconnector comprises two components (A, B) made of different materials. Component (A), which is in contact with the electrodes and ensures the electric connection between the fuel cell units, is made of a chromium oxide-forming, high-temperature alloy, and component (B), which connects the fuel cell units mechanically, is made of a corrosion-resistant, non-electroconducting, high-temperature material which does not bleed any chromium.
Abstract:
A process for heat-treating refuse comprising the steps of decomposing in a combustion furnace a quantity of refuse into slag, emitted gas and fly dust. The fly dust is separated into a fine dust fraction and a coarse dust fraction. The coarse dust fraction is fed back to the combustion chamber, and the fine dust fraction is treated for removal of desired constituents.
Abstract:
A process for the separation of krypton from a radioactive waste gas mixt which is released during the chemical dissolution of burned-down nuclear fuel particles, and which in a carrier gas such as air, in addition to krypton, also contains xenon, argon, nitrous oxide and residual gas components. The waste gas mixture flowing out from a resolver has xenon removed therefrom after purifying the waste gas of nitrous oxides and radioactive residual gas components, such as aerosols, iodine, tritium and carbon(C-14) dioxide; and wherein krypton is finally withdrawn from the residual gas mixture and then stored. The invention also relates to an arrangement for the implementation of the inventive process. Subsequent to the purifying of the waste gas mixture from nitrous oxides and radioactive residual gas components, such as aerosols and iodine, a portion of the waste gas mixture is reconveyed into the resolver, and wherein the remaining portion of the waste gas mixture is purified of tritium and carbon(C-14) dioxide, and after an adsorptive removal of xenon discontinuously flows through a preparative gas chromatograph in which the krypton is separated from the residual gas. The remaining portion of the waste gas mixture is thereafter purified of tritium and carbon(C-14), which are removed in the form of HTO or, in essence, 14CO.sub.2, and thereafter adsorptively freed from xenon. The remaining waste gas mixture containing krypton is discontinously conveyed to a preparative gas chromatograph in which the krypton is separated from the residual gas.
Abstract:
For the separation and recycling of NO.sub.x gas constituents through adstion and desorption on a molecular sieve the molecular sieve is passed through in sequential, alternating process steps. Initially, the NO.sub.x is retained up to saturation of the molecular sieve. Thereafter the molecular sieve is regenerated through the introduction of gas. In order to reduce the demands during scavenging of the molecular sieve, and then to facilitate the provision of a closed separating and recycling system, the molecular sieve for regeneration is heated to a temperature for desorbing the adsorbed NO.sub.x and scavenged with a portion of the waste gas containing the NO.sub.x which is to be cleaned. The scavenging gas flow is recycled after passing through the molecular sieve.
Abstract:
A device for separating in a continuous process particles such as heavy ml particles consisting of fuel and/or breeder materials for core reactors, from a first liquid and introducing the separated particles into a second liquid. The device comprises a screen in the form of a movable endless belt or drum over which ends a feeding line conveying the first liquid containing the particles to be separated onto the endless screen. While the particles are retained on the surface of the moving screen journalled in a housing, the first liquid passes through the screen into a catching funnel and from there to a discharge, the catching funnel being arranged in the housing. In the lower portion of the housing and in contact with the outer screen surfaces is a second liquid which takes off from the outside of the screen the particles deposited onto the screen.
Abstract:
A cassette for a high-temperature fuel cell stack, comprising at least one fuel cell including an anode, a cathode, and an electrolyte, and a metal cell frame which surrounds the fuel cell peripherally, wherein the metal cell frame has two sections, these being an inner thin compensating frame that contacts the fuel cell and a thicker, rigid outer frame which is provided for contacting the interconnector. The inner compensating frame comprises a peripheral bead at room temperature, which entirely disappears at temperatures between 980° C. and 1100° C., as a result of the prevailing stresses. The bead has special relief functions. It is significant that this special function of the formed bead is exclusively achieved by way of the warping in the compensating metal sheet or the compensating film, and is formed solely by way of the joining sequence applied, which is to say only in combination with the joining process employed. In contrast, a component that already has a bead prior to the joining process would also be able to compensate for stresses, but not to the same extent as a bead produced using this joining process.
Abstract:
An interconnector for high-temperature fuel cells is characterised in that the interconnector comprises two components (A, B) made of different materials. Component (A), which is in contact with the electrodes and ensures the electric connection between the fuel cell units, is made of a chromium oxide-forming, high-temperature alloy, and component (B), which connects the fuel cell units mechanically, is made of a corrosion-resistant, non-electroconducting, high-temperature material which does not bleed any chromium.
Abstract:
The invention relates to an interconnector for high temperature fuel cells, characterized in that the side edges of the interconnector are electrically contacted to the anode by means of an electrically conducting medium and the anode is mounted in the interconnector by means of spring elements.
Abstract:
An apparatus charges weakly acidic cationic ion exchange resin particles with uranyl ions by contacting the particles stepwise with aqueous uranyl nitrate solution at higher uranium concentrations from stage to stage. An alkaline medium is added to the uranyl nitrate solution in each stage to increase the successive pH values of the uranyl nitrate solution contacting the particles in dependance upon the uranium concentration effective for maximum charging of the particles with uranyl ions.
Abstract:
A vibrating nozzle produces a stream of drops of a nitrate solution that attain spherical drop shape before entering an ammonia gas phase where gas supply nozzles direct streams of ammonia gas obliquely against the drop stream with a component of motion in the direction of movement of the droplet stream, the incidence of the gas streams on the droplet stream being offset a few millimeters from each other along the path of the droplet stream. The flow of gas is at a speed 10 to 20 times that of the velocity of the drops of solution that are uniformly hardened on the surface in their spherical shape so that there is no deformation upon entering the aqueous solution of ammonia in the lower part of the container that confines the ammonia gas phase. The ammonia solution completes the conversion of the nitrate to the corresponding oxide, producing highly uniform spheres such are required for subsequent sintering in the production of nuclear fuel or breeder elements.