JPH0585202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an over-drying apparatus in which filtration and drying are performed sequentially in the same tank.

A device is known in which a cylindrical tank is provided with a filter plate at the bottom, and the excess stock solution introduced into the tank is filtered to extract the liquid, and then the slag accumulated in the tank is dried.

By the way, in this type of known device, after the liquid is passed through a filter plate by gravity or by pressurization or vacuum, the slag accumulated in the tank is dried and taken out. , this removal is often done either manually or using entirely separate equipment, contaminating the slag when it is desired to be obtained and also posing a threat to the workplace and personnel. It is often contaminated with slag, making it impossible to obtain clean slag, and if the slag is harmful to the human body, it can cause major environmental problems.

For this reason, various types of take-out devices have been proposed in the past, but all of them have complex structures, are difficult to operate, are prone to failure, and are difficult to completely remove the slag from the tank. It also had a number of drawbacks, such as the difficulty of cleaning the inside of the tank.

The object of the present invention is to eliminate the drawbacks of the conventional apparatus as described above, to provide a relatively simple structure, easy operation, less failure, and to keep the slag in the tank clean or pollute the environment. The purpose is to provide an overdrying device that can be completely removed without fear of damage.

In order to achieve the above-mentioned object, this invention provides a rotating shaft extending from above to downward in a tank having a conical bottom plate, and a plurality of blade plates are suspended from a rotating arm extending horizontally from the rotating shaft. A first overplate having substantially the same shape as the bottom plate is provided above the bottom plate to form a first intermediate chamber between the two plates, and a screw is vertically disposed concentrically with a discharge port provided at the lower end of both plates, A discharge valve having a second overplate forming a second intermediate chamber between the discharge port and the valve plate is installed, and a gas-liquid circulation member is connected to the first and second intermediate chambers. That is.

The embodiment shown in the drawings will be described.

1 shows an overdrying tank in which a cylindrical body part 2 with an opening at the bottom and a bottom part 3 with a conical bottom plate are separably connected at flanges 21 and 22, and a perpendicular part passes through almost the center of the lid plate. A rotating shaft 4 is installed,
This rotating shaft 4 is rotated in forward and reverse directions by a motor 25 via a speed reducer 24.

A rotating arm 5 extending horizontally is provided at the lower end of this rotating shaft 4, a plurality of vertical vanes 6 are provided on this arm 5, and a vertical screw 7 is further provided at the lower end of the rotating shaft 4. . Per wing plate 6,
Its planar shape is shown in FIG. 2, and in the figure, the left wing plate 6-1 is shaped like a flat plate and is inclined with respect to the radial direction. The wing plate 6-2 on the right side is made of a triangular plate with the apex located toward the center, but instead of this wing plate 6-2, the entire wing plate 6-1 can be used. Good too. The screw 7 is the rotating shaft 4
It may also be mounted on other rotational vertical axes.

A plurality of annular partition plates 1 are provided on the top surface of the bottom 3 of the tank 1.
3 is provided, and a first overboard 8 is arranged on the upper part thereof almost parallel to the bottom board, and a plurality of annular first intermediate chambers 12 are formed between the two plates. It communicates with the outside of the tank. Overboard 8
A discharge port 9 concentric with the screw 7 is provided on the bottom plate of the tank 1. The pass plate 8 is usually formed of a porous plate such as a polymerized wire mesh or a sintered metal plate.

On the lid plate of the tank 1, an excess stock solution supply pipe 16, an excess pressurized gas supply pipe 17, a heated gas supply pipe 18 for drying the slag, and a slag cleaning supply pipe 19 are attached to the bottom of the cleaning liquid supply pipe 19. Annular through pipe 2
0 is concatenated.

The discharge port 9 has a discharge valve 1, which is shown in detail in FIG.
0 is attached. This valve 10 has a discharge hole 28 provided in the center of a valve body 27, and a second overplate 30 located in the discharge hole 28 on one side of a valve stem 29 that is rotatably provided in the main body 27 in a horizontal direction. I was told,
Behind it, a second intermediate chamber 32 is formed between the valve plate 33 and the intermediate chamber 32, which communicates with the outside of the tank via a communication hole 31 provided in the valve stem 29. 30 is constructed similarly to the overplate 8.

As shown in FIG. 1, each of the flow pipes 14 and the flow holes 31 are connected to a drain receiver and a pressurized gas source 36 (not shown) via pipes connected thereto, and the pipes have valves 37, 38 are provided, and these members constitute a gas-liquid distribution member.

A slag receiver 34 is separably coupled to the outlet of the discharge valve 10.

Next, the state of use of the above-mentioned device will be explained.

In the above, the diameter of the tank 1 is 110 cm, and the depth from the lid plate to the overplate 30 of the discharge valve 10 is 60 cm.
3, close the discharge hole 28 with the valve plate 33, and close the discharge hole 28 with the valve plate 33.
is opened and valve 38 is closed.

An excess of 1,300 mL of an organic solvent containing 5% crystalline solids was added to the thus prepared solution via the supply pipe 16.
is supplied into the tank 1, and pressurized gas is supplied into the tank 1 from the supply pipe 17 to start filtration by gas pressure.
The liquid generated at this time passes through a large number of small holes with a diameter of 5 microns in the overplates 8 and 30, enters the intermediate chambers 12 and 32, respectively, and enters the flow gap 14 and the flow hole 31.
is discharged to the outside through the

The slag deposited on the upper surfaces of the overplates 8 and 30 in this way is washed with the cleaning liquid introduced into the tank 1 via the supply pipe 19 and the withdrawal pipe 20, and the washed liquid is washed in the same manner as above. It is discharged to the outside through the flow pipe 14 and the flow hole 31, and the over-step process is completed.

The slag thus deposited in tank 1 was 300 mm thick at the center and 100 mm thick at the outer periphery.

In the next drying process, the supply pipe 18 to 50
Heated air at a temperature of 80 m ³ /hr at 80 m 3 /hr is introduced into the tank 1 and aired between the particles of the slag for drying. The dry waste gas containing the solvent generated at this time is
The liquid is discharged to the outside through the flow pipe 14 and the flow hole 31 in the same manner as the liquid described above.

When the motor 25 is activated to rotate the arm 5 in the direction of the solid arrow in FIG. The plate 6-2 receives a force directed inward in the direction of arrow A', and at this time, the screw 7 rotates in a direction that lifts the slag upward and then drops it, and as a result, the slag is dried. It is effectively carried out under the action of crushing and stirring. At this time, valve 38
When the valve 37 is opened and the valve 37 is closed, pressurized gas is introduced into the tank 1 using the gas liquid 36 through the flow pipe 14 and the flow hole 31, and the slag is lifted up, so that it is not heated when the vane plate 6 is started. This reduces the mechanical load, and when finishing the drying process, the slag overboard 8, 3
It brings about separation from zero, floating, and a fluid state, which helps promote efficient drying. In this case, the accumulated slag is thicker at the center than at the outer periphery as described above, so a control valve (not shown) is placed in each pipe that sends pressurized gas to each intermediate chamber, Therefore, if the amount of pressurized gas is adjusted to be large, drying of the slag in each part can be made more uniform.

After the drying process is completed in this way,
As shown in FIG.
After the valve stem 29 is rotated 90 degrees to open the discharge hole 28, pressurized gas is introduced into the tank 1 through the flow pipe 14, and the dried slag deposited on the overplate 8 is removed. detach, float, and flow. Similarly, when the arm 5 is rotated 5 revolutions per minute in the direction of the dotted arrow in FIG. The blade plate 6-2 also receives an inward component force shown by the arrow B' similar to the component force A', and at this time the screw 7 rotates to move the slag downward.
As a result, the crushed and dried slag gathers toward the center inside the tank 1 and descends. At this time, since the bottom of the tank 1 is inclined in a conical shape, the introduction of pressurized gas into the overplate 8 causes the slag in the gap between the vane plate 6 and the overplate 8 to flow and move to the center. Therefore, there is no need to make the gap between the overplate 8 and the vane plate 6 extremely small, and the tank 1
The amount of slag remaining in the tank was very small, only 0.5 kg compared to the 60 kg of dried slag discharged.

The pressurized gas used in the above process is selected depending on the slag or solvent, but generally air or an inert gas such as nitrogen is used. It goes without saying that those suitable for the particle size of the slag are selected, and in addition to these, the materials, shapes, and dimensions of each part are appropriately selected depending on the dimensions and characteristics of the slag and the solvent. However, the angle of inclination of the bottom plate of the bottom part 3 of the tank affects the thickness of the accumulated slag, and if this is too large, the difference in thickness between the outer periphery and the center of the tank will become large, causing uneven drying of the slag. If the angle is too small, it will be difficult to completely discharge the slag, so 20 to 25 degrees is actually preferable.

If the above-mentioned work is not carried out and it is necessary, all that is required is to separate the body part 2 and the bottom part 3 at the flanges 21 and 22 and clean the inside, which is extremely easy. It is.

This invention is as described above, and a first intermediate chamber is formed between the conical bottom plate and the first pass plate having substantially the same shape as the conical bottom plate, and a second intermediate chamber is formed between the discharge port and the valve plate. A discharge valve having a second overplate is installed;
A gas-liquid distribution member is connected to the second intermediate chamber, and the tank is provided with a plurality of vanes hanging from a horizontal rotating arm and a screw concentric with the discharge port, so that the liquid passes through both passing plates. The gas is discharged from the intermediate chamber to the outside using the gas-liquid distribution member, and after the gas has passed, pressurized gas is introduced into the intermediate chamber using the gas-liquid distribution member, and this gas is discharged onto the overplate. Floating the slag of
Since it can be made to flow, the drying process is efficiently carried out by the crushing and stirring action of the vanes and the screw.Furthermore, during the discharge process, the pressurized gas is discharged by the vanes and the screw, as described above. It cooperates with the work and enables smooth discharge, and all of this is done automatically in a closed tank, so clean slag is obtained without contamination, and there is no risk of environmental pollution due to slag. It has many excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a partially vertical front view of an embodiment of the present invention, Fig. 2 is a bottom view of the rotating arm, vane plate and screw shown above, and Fig. 3 is an enlarged longitudinal sectional view of the discharge valve shown above. be. 1...Overdrying tank, 2...Body part, 3...Bottom part,
4... Rotating shaft, 5... Rotating arm, 6... Wing plate,
7... Screw, 8... First overplate, 9... Discharge port, 10... Discharge valve, 12... First intermediate chamber, 13
... Partition plate, 14 ... Distribution pipe, 27 ... Valve body,
28...Discharge hole, 30...Second overplate, 31...
Communication hole, 32... Second intermediate chamber, 33... Valve plate, 3
6... Pressurized gas source, 37, 38... Valve.

Claims (1)

[Scope of Claims] 1. A rotating shaft extending from above to below is provided in a tank having a conical bottom plate, and a plurality of blade plates are suspended from a rotating arm extending horizontally from the rotating shaft,
A first overplate having substantially the same shape as the bottom plate is provided above the bottom plate to form a first intermediate chamber between the two plates, and a screw is vertically disposed concentrically with a discharge port provided at the lower end of both plates. A discharge valve having a second overplate forming a second intermediate chamber between the outlet and the valve body is installed, and a gas-liquid circulation member is connected to the first and second intermediate chambers. Overdrying equipment. 2. The over-drying device according to claim 1, wherein the first intermediate chamber is divided into a plurality of annular chambers by a plurality of annular partition plates.