Abstract:
Chemical washing of sulphur-laden flue gases produces unsaleable gypsum. An alternative process is proposed in which the sulphur dioxide is absorbed (8) at low temperature in a solvent from which it is later expelled (14) by heating and finally (19, 26) undergoes further processing, e.g. to sulphuric acid. Air is used instead of steam as the stripping gas and the heat is supplied (4) to the solvent separately. If the quantity of air supplied is eight times that of the sulphur dioxide expelled, a sufficient quantity of oxygen is available for the catalytic oxidation. An installation for implementing the process is described.
Abstract:
The process is of special interest to refinieries in the neighbourhood of existing oilfields. The crude oil additionally released in the known manner by the introduction of hot water or steam contains also a so-called petroleum gas consisting largely of methane as well as other combustible gases. According to the invention, this gas is converted in hydrogen using a cracking oven heated by a high-temperature reactor, with steam being produced by the heat released by the cracking oven
Abstract:
Mixing device for several turbulent fluid flows at different temperatures and/or of different compositions with only one mixing chamber (1) even for high flow rates, especially beneath the reactor core of a gas-cooled high-temperature reactor. The mixing chambers (1; 21; 31; 44) may have a straight, a bowed and, especially in high-temperature reactors, a circular centre line. Several inlet (2) or radial (43) channels, which are offset in the direction of the centre line or diverted from the vertical, when the centre line is horizontal, open into these mixing chambers. In high temperature reactor plants with radially and/or azimuthally differing heat dissipation in the reactor core, hot and cold streams of gas, even those released through unavoidable gaps, are to be mixed with the main gas flow without endangering the adjoining metal structural components.
Abstract:
A withdrawal system is disclosed for pebble-shaped fuel elements (5) of a gas-cooled pebble-bed reactor. The withdrawal has a withdrawal pipe (1) open at its lower end and arranged underneath the nuclear reactor vessel, a pebble box (16) arranged underneath the withdrawal pipe and a rotative perforated disk (6) for removing the fuel elements (5). Between an outlet (15) of the withdrawal pipe (1) and the perforated disk (6), above the bottom of the pebble box (16), is located a blocking edge (17) upstream of which gas nozzles (18) open into the bottom of the pebble box (16). A stream of gas discharged through these gas nozzles (18) loosens and lifts the elements (5), which then passes over the blocking edge (17) up to the perforated disk (6) and are thus removed. In the absence of the stream of gas, a conical heap forms above the blocking edge (17), preventing the fuel elements (5) from flowing out and allowing the perforated disk (6) to be removed without problems.
Abstract:
An optimized soldering process for producing hollow crankshafts is disclosed, in which each of the component part (A, B, C, D) comprises a cheek (1) and part of the axle end (2) or journal (3) of the crankshaft. In order to secure the component parts (A, B, C, D) in their mutual final position before their introduction in a soldering oven while maintaining a soldering gap of sufficient volume, the component parts are press fit together, and one of them is provided with a milled surface (5, 6). The recesses of the milled surface form the soldering gap (6). The solder injector (7) is arranged in order to ensure its perfect introduction in the soldering gap (6). The end of the soldering gap is located on the outer side of the journal, allowing an optical quality inspection to be carried out. The support surfaces (4) of the journals may be finished before they are assembled.
Abstract:
A mounting device for manufactured camshafts has a holding means for axially locating individual elements such as cam wheels, bearing seats or toothed wheels and a pressure probe for hydraulically enlarging a hollow shaft in sections, the elements and the hollow shaft being frictionally connected to each other. The holding means is provided with individual locating disks (40) that each have a central opening (16, 68) for receiving an element such as a cam wheel (80), a bearing seat a toothed wheel, and an outer bearing seat for receiving in each of the bearing positions of the holding means. With these locating disks the individual elements can be located in the correct angular position before being mounted, and the hollow shaft can move radially with respect to the elements.
Abstract:
A modular liquid metal-cooled nuclear reactor for a nuclear power plant is lodged in a reactor cavern (3) fitted with cooling surfaces (4). The reactor comprises a reactor tank (1) which contains a reactor core (12), one or more heat-exchangers (18) and primary pumps. It is surrounded by a cast iron double tank (2) which acts as a heat accumulator and which consists of a plurality of detachably interconnected, superimposed rings (2a) and a base (2b). This arrangement simplifies the structure and facilitates operation, inspection and repair or interchange. The manufacture of the double tank (2) from cast iron has appreciable advantages for the design of the entire plant as regards external influences. The heat accumulator function has appreciable advantages for the design of the heat dissipation systems of the cooling surfaces (4).
Abstract:
A mixing device for several turbulent streams of fluid (5) at different temperatures and/or of different compositions comprises a mixing chamber (1) for large throughputs and minimal pressure losses, in particular below the reactor core of a gas-cooled high-temperature reactor. The mixing chamber (1) can have a straight, curved and, in particular in high-temperature reactors, a circular median line (2). Several deflecting elements (3) located at a distance apart in the direction of the median line (2) open into the mixing chamber (1). In high-temperature reactor installations in which the heat is dissipated in different radial and/or azimuthal directions, hot and cold strands of gas, even those which issue from unavoidable gaps, are mixed with the main gas stream without endangering the adjacent metallic structural components.
Abstract:
A double-walled compressed gas cylinder of minimal weight, in particular for high-purity or corrosive gases, comprises a pressure-resistant outer container (1) made of a highly resistant material and an essentially thin-walled inner container (3) made of high-grade steel with a thick-walled neck (5). The inner container (3) is first introduced through the open end of the outer container (1) which is then narrowed from the outside to confer on it the shape of a bottle.
Abstract:
A bellow-type pump comprises a plurality of bellows (51) to (54) grouped radially about the drive axis and driven simultaneously so that the torque is applied uniformly. Asymmetrical loading of the bellows, which reduces their service life, is prevented by improved coupling of the eccentric movement of the drive shaft (34) with the bellows. The outlets (62) from the individual bellows can be connected in parallel or in series, as desired, so that a greater delivery volume or higher delivery pressure can be attained, depending on requirements. The pump housing (1) consists of a double-cross piece used as an assembly unit in ultra-high vacuum technology. To ensure complete evacuation of the pump, for example to allow subsequent introduction of ultrapure gases, spring-loaded valves (82) which block the direction of flow are maintained temporarily in an open position during normal operation. To this end, the closure bodies of the valves are made from a magnetic material and can be influenced by a magnet (84) mounted on the outside of the pump housing (1, 73), which is made from non-magnetic material. The valve returns to its closed position immediately the magnet (84) is brought into, and possibly stopped in, a remote position.