JPH012000A - Collection tank for suspensions containing solid substances - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solid substance co-suspension having a bottom inclined towards the outlet and a spraying device arranged near the inner wall.
Particularly related to radioactive liquid collection tanks.

Prior art When a tank filled with a suspension containing homogeneous materials is emptied, solid materials are deposited at the bottom of the tank, and this problem is particularly noticeable when the filling liquid level is low. This phenomenon is caused by the fact that the stirring device installed in this type of tank loses its function as the filling liquid level drops. However, especially in tanks that collect radioactive liquids, this precipitate should be discharged [J
It is necessary to reliably prevent solid substances from accumulating at the bottom of the tank by transporting the tank to a tank.

Vertical and horizontal round-bottomed tanks or annular tanks (so-called ring-slab tanks) are used in nuclear fuel reprocessing plants, the bottoms of which are arranged at a slight inclination to the conveying conduit.
Labbeh! It, er) is incorporated. In this case, it has been proposed to place the injection device close to the bottom or inner wall, thereby washing away the solid deposits.

However, this method (9JQ7) is insufficient in the case of large tanks because it requires multiple injection liquids.The large amount of injection liquid required after emptying the tank requires a huge amount of liquid to remove if it is a radioactive product. This undesirably increases the amount of secondary contaminants that require treatment.Furthermore, the useful substances in the radioactive product liquid are present in a highly diluted state by the injection liquid, which impedes economic processing of the product liquid. This brings about the disadvantage of

Measures that significantly increase the slope of the tank bottom are insufficient as a solution to reduce the amount of liquid injected, since, especially in the case of annular tanks, the height of the tank must essentially be increased. be. This procedure requires additional space in nuclear industrial equipment, which can only be obtained at great expense.

Problem to be Solved by the Invention The fundamental problem of the present invention is to reliably remove solid deposits from the tank bottom using as little injection liquid as possible.

Means for Solving the Problem According to the present invention, the tank bottom is configured in a groove shape when viewed in a cross section of the tank, or the tank bottom is provided with a drainage groove extending in the direction of the discharge port, and This problem is solved by arranging the injection pipe toward the drain groove at the highest point of the groove-like structure and the drain groove.

According to the invention, a drainage channel is provided in the bottom of the tank, which is designed to allow liquids and solids to flow during emptying of the tank or during cleaning operations. This drainage groove is inclined in the direction of the outlet, so that the solid material is conveyed to the outlet with an increased flow rate by the residual liquid or the jet liquid.

This drain provides a specific area in the tank bottom in which the solids to be settled or washed out can be collected and flushed from there with high efficiency to the outlet. By installing an injection pipe toward the drainage groove at the highest point of the drainage groove, the injection liquid that efficiently cleans and removes the solid-liquid mixture swept into the drainage groove is sent to the drainage groove as shown in Figure 7C. be able to. The amount of injection liquid required by the injection device can be significantly reduced.

Advantageous embodiments of the invention as defined in claims 2 and 3 make it possible to completely collect the solid material and the propellant in the drain.

By virtue of an advantageous embodiment of the invention as defined in claim 4, the formation of protrusions in the tank chamber and the deposition of solid substances thereon are avoided. Favorable washing removal of solid substances is also ensured. By configuring the cross section of the drain groove as described in claim 5, the liquid to be washed and removed can be guided even better.

Claims 6 and 7 indicate special configurations of the annular tank according to the invention.

The present invention provides long-term +7? by charging a small amount of injection liquid even in the case of a large tank. , f has the essential advantage of reliably preventing solid substances from depositing on the tank bottom. In this case, it is particularly advantageous that the product liquor is only slightly diluted. It also limits the increase in radioactive waste liquid.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a so-called ring-slab tank 11 with an annular chamber 13 for collecting a solid substance-containing suspension. The bottom 15 of the tank 11 is installed at an inclination angle β of 3°. In the deepest part of the bottom 15 there is a discharge [ ] 17 in which a flow conduit I9 for emptying the tank 11 is arranged. Above the annular chamber 13 there is a tubular spray device Z20 with a nozzle opening.

The horizontally round bottom tank 21 according to the state of the art shown in Figure 2
Similarly, the bottom 23 is slightly inclined with respect to the flow conduit 25.
The conduit is immersed in a reservoir 27. A spray conduit 29 is arranged close to the wall, via whose nozzle opening the inner wall can be cleaned.

FIG. 3 shows a ring slab tank 31 in a schematic cross-sectional view, the tank bottom 33 being WJl in this cross-sectional view.
It is constructed with a slight slope towards the invisible flow conduit. The annular chamber 35 for collecting liquid has a symmetrical drainage groove 37 in the area of the tank bottom 33, the groove walls 39 and 41
has a steeper angle of inclination than the inclination of the tank bottom 33. The inclination angle α of the groove wall is 45°, and the inclination angle β of the tank bottom 33 is 3°. An injection pipe 43 is disposed at the top of the drain groove 37 . The annular atomizing device is not shown in FIGS. 3 and 4 to 6Uji, since this device is installed similarly to the atomizing device 2o not shown in FIG.

In FIG. 4, the ring slab tank 31 has an asymmetrical jJl liquid 49 located outwardly from the center in the bottom 33. The injection pipe 43 is preferably bent at an angle of 1σ with respect to this off-centre drainage groove 49 .

In FIG. 5, the tank bottom 33 has a groove 55 located inwardly from the center. The injection tube 43 is likewise bent inward at right angles.

In the embodiment of the ring slab tank 31 shown in FIG. 6, the bottom of the annular chamber 35 has a round groove-like structure 63. Therefore, this embodiment R has a left-right symmetrical drain groove structure. The injection pipe 43 is centrally located at its highest point.

In FIG. 7, an embodiment of a horizontal round-bottomed tank 7I is shown in a schematic partial sectional view, the tank bottom 73 of which is connected to the discharge lower 5.
The semi-circular drain groove 77 is located at the deepest part of the tank bottom 73 in the axial direction up to the drain lower 5 (Fig. 9). A spray conduit 79 is disposed in the drain groove 77 so that the mass deposits can be washed away into the drain groove 77. The contents of the drainage channel 77 are flushed away towards the flow channel '1783.

In Fig. 8, the drain groove 85 is located at the bottom of the round bottom tank 7■.
It is constructed in the shape of a triangle with the bottom facing upwards, so the triangle stands on end.

From FIG. 9, the side of the injection pipe 8I is the drainage groove 7 of the round bottom tank 71.
It is clear that it exists at the highest point of 7 or 85.

The operation of the tank device described above is as follows: drain grooves 37, 49, 55, 6 of the structure shown in FIGS. 3 to 6.
In ring-slab tanks 31 having one of 3, when emptying the tank residue, the solid material is transferred from the tank wall via a tubular spray device (see 20 in FIG. 1) to the respective drainage channel 37.
．． It is washed away in the direction of 49.55.63. Solid material to be settled or washed away is collected in a specific area on the bottom of the tank. The injection liquid is supplied from the injection pipe 43 disposed at the highest point of the drain groove 37, 49, 55, 63, so that the solid substance is sent to the discharge port together with the residual liquid or injection liquid at an increased flow rate. .

The operation of the horizontal round-bottomed tank 71 having the drain groove 77 or 85 is similar. Via the atomizing conduit 79 representing the atomizing device, the solid substances to be settled or washed out into the drainage channel 77 or 85 are flushed to a certain area of the tank bottom 73 and from there to the discharge r175 at a high flow rate.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a ring slab tank according to the known technical level, and Fig. 2 is a schematic side view showing a horizontal round-bottomed tank according to the known technical level [A, Fig. 3, Fig. 4, Fig. 5] and FIG. 6 are cross-sectional views showing various embodiments of the tank bottom according to the present invention, FIG. 7 is a cross-sectional view of a horizontal round-bottomed tank having a semicircular drain groove with an open top side, and FIG. 8 9 is a cross-sectional view of a horizontal round-bottomed tank in which a drainage groove having an inclined wall is constructed, and FIG. 9 is a schematic side view of a structured round-bottomed tank having a drainage liquid 1^ at the bottom of the tank. 31... Tank, 33... Tank bottom, 35... Tank chamber, 37... Drain groove, 39.41... Groove wall, 4
3... Injection pipe, 49.55.63... Drain groove, 71
... Tank, 73 ... Tank bottom, 75 ... Discharge port,
77...Drainage groove, 81...Injection pipe, 85...Drainage channel -1゜FIG, I FIG, 2 Tank chamber entrustment

Claims (1)

[Claims] 1. A collection tank for solid substance-containing suspensions with a bottom sloping towards the outlet and a spray device arranged close to the inner wall, in which the tank bottom (33, 73) Tank (31
, 71), which are groove-shaped in cross-section or which extend in the direction of the outlet (75).
5, 63, 77, 85), and an injection pipe (43,
81) Collection tank for solid substance-containing suspensions. 2. The wall of the drain groove is at the bottom of the tank (3) relative to the outlet (75).
3. The tank according to claim 1, having a steeper angle of inclination than the angle of inclination of 3,73). 3. The tank according to claim 2, wherein the drain groove wall has an inclination angle of 45° to 60°, and the tank bottom has an inclination angle of 3° to 5°. 4. The tank according to any one of claims 1 to 3, wherein the cross section of the drain groove (63, 77) is configured as a semicircle with an open top. 5. Tank according to any one of claims 1 to 3, characterized in that the cross section of the drain groove (37, 85) has a triangular structure, the vertex of this triangle pointing downward. 6. The tank according to any one of claims 1 to 5, wherein the drain groove (37, 63) is configured symmetrically by smooth or arcuate drain groove walls (39, 41 or 63). . 7. Tank according to any one of claims 1 to 5, characterized in that the drainage grooves (49, 55) are arranged asymmetrically on the outer or inner circumference of the annular tank space (35).