DE2040673C3 - Conveyor pipe for the pneumatic conveyance of spherical elements - Google Patents

Description

It is also part of the state of the art, stabför- should be at least 1 mm. B.

mige nuclear reactor fuel elements with transverse or the following options:

To give away longitudinal ribs, which are either used as

holds inside a protective tube (German _{tube! inside diameter} . _Rippen2ah , _Rip penhBhe in mm

Patent specification 10 04 744) or an enlargement of the 5 _knives h, mm

heat-emitting surface of the fuel elements.

cause (German interpretation documents 1041176,

10 51423 and 1041610). In the former '72 3 4

German patent specification 10 04 744 can rip the 68.4 4 per 2 ribs)

pen, cams or the like also on the inner wall of the io 66 6 2.5 per 2 ribs)

Thermowell be appropriate, but it is "_{'The beiDt} R _O hrinnendurchmcsser minus sparse waste

hicr neither around spherical fuel elements nor stood between two opposing ribs.

takes place through a promotion of the fuel elements

the protective tube instead. For the sake of easier manufacturing

If spherical elements with slightly less than 15 conveyor pipes with four longitudinal ribs should be chosen,

different diameters through the pipe system in the manner shown in the drawing

are promoted, the number, height and arrangement are arranged.

Order of the longitudinal ribs chosen so that the conveyor pipe 1 has, for example, an inner

The spherical elements with the smallest diameter of 68 mm and has four longitudinal ribs 2

Diameter is not based on the actual pipe wall, which are offset by 90 ° to one another. From the-

can ren. In a nuclear reactor with a spherical stand two opposing ribs 2 is

gene fuel elements have z. B. the largest 64 mm. In the delivery pipe there is a spherical

Fuel elements a diameter of 61 mm shaped fuel element 3, which is the smallest for

and the smallest one of 58 mm; also the pebble-bed nuclear reactor considered here

should still have calibration balls with a diameter of 63 mm as the approved diameter, namely 58 mm,

straight into a conveyor tube provided with inner ribs The distance of the fuel element 3 from the

fit in. It is assumed that the actual pipe inner wall is 4 even with a

minimum distance of the smallest spherical extremely eccentric position of the fuel element 3

Fuel element from the actual pipe wall another 1 mm.

1 sheet of drawings

Claims (2)

1 2 The ribs ensure that the spherical claims: elements even with an extremely eccentric position ■ within the conveyor pipe only with the ribs 1. Come into contact with the conveying pipe for pneumatic conveying. On this?. By spherical elements, in particular from 5, it is achieved that the spherical elements are evenly fuel elements for nuclear reactors, the diameter of which is flowed around by the conveying gas and the clearance is only slightly larger than the diameter \ insignificant transverse forces, diameter of the spherical elements As experimental studies have shown, characterized in that the conveyor pipe (1) has the spherical turning effect through the arrangement of at least three longitudinal inner ribs (2) so several longitudinal ribs on the inner wall of the pipe, which avoid an application of the spherical safety, and this length the we-elements on the actual pipe wall (4) have a significant advantage that they are spherical on the surface. shaped elements themselves no changes, e.g. B. 2. Conveyor pipe according to claim 1 for kugelför- roughening, need to be made, mige elements with slightly different 15 Although it belongs to the prior art, in the diameter, characterized in that elbows of pipes for the promotion of number, height and Arrangement of the ribs (Z) bulk material plate-shaped bodies or ribs are preselected in such a way that the spherical ones, which are arranged parallel to the pipe axis, also see; Elements with the smallest diameter (3) but with this design of the pipe elbow not touching the actual pipe wall (4) a completely different task can be achieved. That’s all over. «For German patent specification 3 87 935 an air conveyor known for granular bulk material, in whose pipe bends rib-like flow plates are built, JUt the help of which prevents the secondary currents. ————- as should be changed or attenuated, which are in a Form air flow guided through a curved duct. It is known that the tributaries can only be effectively suppressed if The invention relates to a conveyor pipe for pneumatic the rib-like guide plates are higher than the limit tables Conveying spherical elements, 30 layer in the bulk material flow, d. i.e., the lead in particular of fuel elements for core sheets are to be designed in such a way that a partial flow reactors, the clear width of which is only slightly larger, the bulk material is guided between the baffles than the diameter of the spherical elements. will. The rib-like baffles of the well-known The fuel elements, dw constantly in one of the air conveyors, must therefore move much further into the like nuclear reactor are circulated, d. H. the inside of the tube extend than the inner ribs according to FIG Reactor core removed and after going through an invention, so that the intended effect - Dämp-Abbrandmeßanlage are added again, must fung of occurring in the direction of the pipe circumference speed components of the conveying air and be, whereby a gas is used as a means of conveyance of the conveyed material - can occur at all. on will. 4 ° Due to their dimensions, the types of ribs can vary An undesirable effect occurs here, which is not followed in the guide plates when conveying bulk material are referred to as the "ball turning effect" if they perform the function that the longitudinal ribs are supposed to do: The spherical fuel elements that the invention is intended for, namely too often with the inner wall of the delivery pipes in account that the elements to be conveyed are on the This contact will create a 45 wall of the delivery pipe. With the size binding with the asymmetrical relationship that occurs in the known air conveyor between the flow the ball through the conveying gas in see the pipe diameter and the rotation offset. The normal onward transport knife of the individual particles of the bulk material beder Ball is thus interrupted. stands (it is granular bulk material whose The ball turning effect only occurs when the 50 particles have a diameter of at most a few balls to be conveyed have a diameter of millimeters), the ball turning effect also plays which is only a little smaller than the inside diameter does not matter at all, because the particles because of their small size Conveyor pipe, as it is, for. B. in the promotion of means no influence on the flow conditions in spherical fuel elements is the case. the conveying air. The in the German patent The invention is based on the object of the 55 scripture 3 87 935 proposed training of the The development of this rotating ball effect in the pneumatic pipe or delivery line would not contribute to it Promotion of spherical elements to gene, the problem on which the invention is based prevent. to solve, especially since those attached in the pipeline For this purpose, in the case of a conveyor pipe, the initially rib-shaped guide plates - the other task mentioned Type the embodiment according to the invention 60 position accordingly - only in the area of Krümdarin to see that each conveyor pipe at least mern and in the directly to the manifold andrei Has longitudinal inner ribs which are provided for adjacent pipeline parts. the Application of the spherical elements to the actual preventing the spherical effect, which the Erlichcn Prevent pipe wall. has made finding a task is only possible The number of ribs is determined by the addition of at least three longitudinal dimensions of the individual ribs; current at its inner fixed ribs applying the kugellegung should only technical manufacturing reasons a shaped elements on the conveyor pipe wall not-Roile SDielen. leave.