JP7395691B1 - Deposit removal device, deposit removal method, and slurry recovery device - Google Patents

Abstract

An object of the present invention is to remove deposits that adhere to a wall surface before they solidify, thereby preventing the deposits from adhering to the wall surface and solidifying. SOLUTION: A deposit removal device 1 removes deposits adhering to the inner wall surface of a recovery tank 11 for collecting slurry; 2B, solvent tanks 3A, 3B filled with a predetermined amount of solvent, pipes 6A, 6B connecting the upper parts of the solvent tanks 3A, 3B and the nozzles 2A, 2B, and the lower parts of the solvent tanks 3A, 3B. This is an air supply unit 4 that supplies compressed air, and at the beginning of compressed air supply, the solvent in the solvent tanks 3A, 3B is injected from the nozzles 2A, 2B, and in the middle stage, the solvent remaining in the solvent tanks 3A, 3B is sprayed. The pressure of the compressed air is set so that droplets containing a mixture of and compressed air are injected from the nozzles 2A and 2B, and at the final stage when the solvent in the solvent tanks 3A and 3B is used up, compressed air is injected from the nozzles 2A and 2B. and an air supply section 4. [Selection diagram] Figure 1

Description

The present invention relates to a deposit removal device and a deposit removal method for removing deposits from a wall surface, and a slurry recovery device.

For example, Patent Document 1 describes a device that atomizes solid particles into fine particles by accelerating a liquid containing solid particles with a gas flow to form micro droplets in a fluid state and colliding the micro droplets with a collision part. There are atomization devices described. Further, as an apparatus for recovering micro droplets as slurry after being atomized by collision with a collision part, there is a slurry recovery apparatus described in Patent Document 2, for example.

FIG. 3 is a partially omitted vertical sectional view showing the slurry recovery device described in Patent Document 2. As shown in FIG. 3, in the slurry recovery device 100, a gas flow (air flow) is supplied to the atomization device 150 via a gas supply pipe 152, and a liquid containing solid particles is supplied via a liquid supply pipe 151. When supplied, the liquid containing solid particles supplied via the liquid supply pipe 151 is accelerated by the gas flow supplied via the gas supply pipe 152, and becomes micro droplets in a fluid state and becomes fine. It is sent to the processing section 153.

In the atomization processing section 153, solid particles are atomized into fine particles by colliding the sent minute droplets with a collision member 155, and an air flow in which slurry, which is a liquid containing solid particles, is mixed in a mist form is created. S100 and is supplied to the air supply path 105 of the slurry recovery device 100 via the gas flow space 154. The air flow S100 supplied to the air supply path 105 is bent in its traveling direction by 90 degrees by the elbow 105b, blown out in a direction forming a torsional positional relationship with the axis 101c of the chamber 101, and collides with the inner circumferential surface 101d of the chamber 101. Therefore, a swirling flow that spirally rotates around the axis 101c is generated inside the chamber 101 and the recovery section 103, resulting in a cyclone effect.

Due to this cyclone effect, the slurry, which is a liquid containing solid particles contained in the air flow S100, moves in a direction approaching the inner circumferential surface 101d of the chamber 101 due to centrifugal force and adheres to the inner circumferential surface 101d. The liquid then descends along the inner circumferential surface 101d toward the inner circumferential surface 103d of the collection part 103, and after reaching the inner circumferential surface 103d, it descends along the inner circumferential surface 103d and flows into the drain pipe 108, where it reaches a predetermined level. It is collected into a collection container (not shown). Further, due to the cyclone effect, the swirling flow near the axis 101c in the chamber 101 has a significantly reduced slurry content, and is then sucked into the exhaust path 104 from the lower end opening 4b of the exhaust path 104, and is exhausted. It flows into the exhaust unit 109 via the path 104.

Further, in the slurry recovery device 100, a spray 106 is provided on the lower surface side of the lid 102 of the chamber 101, and a spray 107 is provided on the peripheral wall 101w of the chamber 101. By operating the sprays 106 and 107 alternately for 1 to 2 seconds at intervals of 3 to 60 seconds in the chamber 101, the sprays adhere to the inner circumferential surface 101d of the chamber 101 and the inner circumferential surface 103d of the collection section 103. It is possible to quickly flow down the slurry toward the drain pipe 108 and reduce the amount of slurry attached to the inner circumferential surface 101d of the chamber 101 and the inner circumferential surface 103d of the recovery section 103, thereby reducing the amount of slurry lost. be able to.

Patent No. 4447042 Patent No. 7039666

By the way, in the slurry recovery device 10, since the slurry is injected with air, a certain amount of the solvent in the slurry is vaporized and the solid content concentration of the slurry is concentrated. On the other hand, the amount of solvent used to clean the inner circumferential surface 101d of the chamber 101 and the inner circumferential surface 103d of the recovery section 103 mixes into the slurry, and thus dilutes the solid content concentration of the slurry. Since the solid concentration of the slurry recovered by the slurry recovery device 10 cannot be changed in order to maintain quality, the same amount of solvent as the amount of evaporation is used for cleaning. Therefore, fine droplets are scattered to prevent solidification on the wall surface, but if the slurry has a high solid content concentration, there is a problem in that it tends to adhere and solidify on the wall surface.

Therefore, in the present invention, it is an object of the present invention to provide a deposit removal device, a deposit removal method, and a slurry recovery device that can remove deposits that adhere to a wall surface before solidification and prevent the deposit from solidifying on the wall surface. purpose.

The deposit removal device of the present invention is a deposit removal device for removing deposits adhering to the inner wall surface of a recovery tank for collecting slurry, and includes a nozzle that sprays toward the inner wall surface of the recovery tank, and a predetermined solvent. The solvent tank is filled with a certain amount of solvent, the piping that connects the top of the solvent tank and the nozzle, and the air supply section that supplies compressed air to the bottom of the solvent tank. In the middle stage, droplets containing a mixture of the solvent remaining in the solvent tank and compressed air are injected from the nozzle, and in the final stage when the solvent in the solvent tank is used up, compressed air is jetted out from the nozzle. and an air supply section in which the pressure of compressed air is set so as to cause the air to be injected.

Further, the deposit removal method of the present invention is a deposit removal method for removing deposits adhering to the inner wall surface of a recovery tank for collecting slurry, the method comprising: removing deposits from the bottom of the solvent tank filled with a predetermined amount of solvent By supplying compressed air set to a prescribed pressure to In the middle stage, droplets containing a mixture of the solvent remaining in the solvent tank and compressed air are jetted from the nozzle, and in the final stage when the solvent in the solvent tank is used up, compressed air is jetted from the nozzle. It is characterized by

According to the above invention, by supplying compressed air at a predetermined pressure from the air supply section to the lower part of the solvent tank, the solvent in the solvent tank is injected from the nozzle at the beginning of the supply of compressed air. The inner wall surface of the recovery tank is cleaned by the solvent sprayed under pressure by air. Next, during the middle stage of compressed air supply, droplets containing a mixture of the solvent remaining in the solvent tank and compressed air are jetted from the nozzle, so the high-speed liquid containing the two fluids, solvent and compressed air, is The drops clean the inner wall of the collection tank. Then, at the final stage when the solvent in the solvent tank is exhausted, compressed air is injected from the nozzle, so that the inner wall surface of the recovery tank is cleaned by air blowing. Thereby, the deposits adhering to the inner wall surface of the recovery tank are removed before they solidify.

Here, the nozzle includes a first nozzle disposed at the upper part of the recovery tank and a second nozzle disposed at the lower part of the recovery tank, and the solvent tank is supplied to the first nozzle. It has a first solvent tank filled with a solvent and a second solvent tank filled with a solvent to be supplied to the second nozzle, and the piping connects the upper part of the first solvent tank and the first nozzle. It is desirable to have one pipe and a second pipe connecting the upper part of the second solvent tank and the second nozzle.

As a result, by supplying compressed air at a predetermined pressure from the air supply unit to the lower portions of the first solvent tank and the second solvent tank, the air inside the first solvent tank and the second solvent tank is The solvent flows toward the inner wall surface of the recovery tank through the first piping and second piping that connect the upper parts of the first solvent tank and the second solvent tank with the first nozzle and the second nozzle, respectively. In the middle stage, droplets containing a mixture of solvent and compressed air remaining in the first solvent tank and the second solvent tank are injected from the first nozzle and the second nozzle, respectively. In the final stage when the solvent in the second solvent tank runs out, compressed air can be injected from the first nozzle and the second nozzle, respectively.

It is preferable that the deposit removal device of the present invention includes a solvent supply unit that supplies a predetermined amount of solvent to the solvent tank. Thereby, a predetermined amount of solvent can be supplied from the solvent supply section to the solvent tank, and deposits adhering to the inner wall surface of the recovery tank can be removed as described above.

According to the present invention, by supplying compressed air to the lower part of the solvent tank from the air supply section, the solvent in the solvent tank is injected from the nozzle at the beginning of the supply of compressed air, and the solvent remains in the solvent tank at the middle stage. Droplets containing a mixture of solvent and compressed air are injected from the nozzle, and at the end of the period when the solvent in the solvent tank is exhausted, compressed air is injected from the nozzle to solidify the deposits that adhere to the inner wall of the recovery tank. Since it is removed before the slurry is removed, it is possible to prevent the deposits from re-agglomerating and maintain the solid content concentration of the slurry.

It is a piping system diagram of the deposit removal device with which the slurry collection device in an embodiment of the present invention was equipped. FIG. 2 is an enlarged view of the surroundings of a recovery tank of the slurry recovery device of FIG. 1. FIG. FIG. 2 is a partially omitted vertical sectional view showing the slurry recovery device.

FIG. 1 is a piping system diagram of a deposit removal device provided in a slurry recovery device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the vicinity of a recovery tank of the slurry recovery device of FIG. 1.

As shown in FIG. 1, the deposit removal device 1 included in the slurry recovery device 10 according to the embodiment of the present invention includes inner wall surfaces 12A, 13A, and 14A of the recovery tank 11 of the slurry recovery device 10 (see FIG. 2). Compressed air is supplied to the first nozzle 2A and second nozzle 2B that inject towards the solvent, the first solvent tank 3A and second solvent tank 3B filled with solvent, and the first solvent tank 3A and second solvent tank 3B. and a solvent supply section 5 that supplies the solvent to the first solvent tank 3A and the second solvent tank 3B.

The slurry recovery device 10 accelerates a liquid containing solid particles with a gas flow to form micro droplets of a fluid, and collides the micro droplets with a collision part to atomize the solid particles into fine particles. The micro droplets after the oxidation are collected as slurry in a collection tank 11. As shown in FIG. 2, the recovery tank 11 includes an upper chamber 12, a lower recovery section 13, and a lid 14 that closes the upper opening of the chamber 12. The chamber 12 has a cylindrical shape, and its axis 12C is held upright. The collecting portion 13 has an inner wall surface 13A shaped like a funnel whose diameter continuously decreases downward.

The first nozzle 2A is formed of a tube arranged annularly in the upper part of the chamber 12 of the recovery tank 11 along the inner wall surface 12A thereof. The first nozzle 2A has injection ports 2A-1 and 2A-2 arranged around the axis 12C, which eject toward the inner circumferential surface (inner wall surface 12A) of the chamber 12 and the lower surface (inner wall surface 14A) of the lid 14, respectively. A plurality of them are provided at 45° intervals. Note that the injection direction and interval of the injection ports 2A-1 and 2A-2 can be changed as appropriate.

The second nozzle 2B is formed of a tube arranged in an annular shape at the lower part of the chamber 12 of the recovery tank 11 along the inner wall surface 12A thereof. The second nozzle 2B is provided with a plurality of injection ports 2B-1 arranged at 45° intervals around the axis 12C, which eject the liquid downwardly, that is, toward the inner circumferential surface (inner wall surface 13A) of the recovery section 13. Note that the injection direction and spacing of the injection ports 2B-1 can be changed as appropriate.

The first solvent tank 3A and the second solvent tank 3B are filled with a predetermined amount of solvent. The predetermined amount of solvent to be filled is the same amount of solvent as the amount of solvent in the slurry that evaporates when air is injected into the recovery tank 11 . The upper part of the first solvent tank 3A and the first nozzle 2A are connected by a first pipe 6A. The upper part of the second solvent tank 3B and the second nozzle 2B are connected by a second pipe 6B.

The air supply unit 4 includes a pressure reducing valve 40 connected to a compressed air supply source (not shown), a pressure control valve 41 connected to the pressure reducing valve 40, a first electromagnetic valve 43 connected to the pressure control valve 41, and a first electromagnetic valve 43 connected to the pressure control valve 41. 1 and an air filter 44 connected to a solenoid valve 43. A pressure gauge 42 is provided in the middle of a pipe 70 that connects the pressure control valve 41 and the first electromagnetic valve 43. The pipe 71 connected to the air filter 44 branches into a pipe 71A on the first solvent tank 3A side and a pipe 71B on the second solvent tank 3B side.

A second electromagnetic valve 45A is connected to the pipe 71A. The second electromagnetic valve 45A is connected to the lower part of the first solvent tank 3A via a check valve 46A. A third solenoid valve 45B is connected to the pipe 71B. The third electromagnetic valve 45B is connected to the lower part of the second solvent tank 3B via a check valve 46B.

The air supply unit 4 has a pressure reducing valve 40, a pressure control valve 41, a first solenoid valve 43, an air filter 44, a second solenoid valve 45A and a check valve 46A, a third solenoid valve 45B and a check valve 46B, etc. Compressed air having a pressure reduced by a pressure reducing valve 40 and set in advance by a pressure control valve 41 is supplied to the lower portions of the first solvent tank 3A and the second solvent tank 3B, respectively.

The solvent supply unit 5 includes a solvent supply tank 50 containing a solvent, and a pump 51 that pumps the solvent from the solvent supply tank 50 through a pipe 80. A pipe 81 connected to the pump 51 is branched into a pipe 82A on the first solvent tank 3A side and a pipe 82B on the second solvent tank 3B side.

A fourth electromagnetic valve 52A is connected to the pipe 82A. The fourth electromagnetic valve 52A is connected to the lower part of the first solvent tank 3A via a check valve 53A. A fifth solenoid valve 52B is connected to the pipe 82B. The fifth electromagnetic valve 52B is connected to the lower part of the second solvent tank 3B via a check valve 53B.

The solvent supply unit 5 supplies a predetermined amount to the first solvent tank 3A and the second solvent tank 3B, respectively, through the pump 51, the fourth solenoid valve 52A, the check valve 53A, the fifth solenoid valve 52B, and the check valve 53B, etc. Supply solvent. As mentioned above, the predetermined amount of solvent supplied to the first solvent tank 3A and the second solvent tank 3B is the same as the amount of solvent in the slurry that evaporates when the slurry is injected with air into the recovery tank 11. amount of solvent.

In the deposit removing apparatus 1 having the above configuration, first, the fourth solenoid valve 52A and the fifth solenoid valve 52B are opened, the pump 51 is operated, and a predetermined amount of solvent is pumped into the first solvent tank 3A and the second solvent tank 3B, respectively. to be pumped to. As a result, the first solvent tank 3A and the second solvent tank 3B are each filled with a predetermined amount of solvent. The solvent supplied to the first solvent tank 3A and the second solvent tank 3B is prevented from flowing back by check valves 53A and 53B.

Next, the first solenoid valve 43, the second solenoid valve 45A, and the third solenoid valve 45B are opened, and the compressed air set at a predetermined constant pressure by the pressure control valve 41 is supplied to the first solvent tank 3A and the second solvent tank, respectively. Supplied to the lower part of tank 3B. The compressed air supplied to the first solvent tank 3A and the second solvent tank 3B is prevented from flowing back by check valves 46A and 46B.

Thereby, in the initial stage of compressed air supply, the solvent in the first solvent tank 3A and the second solvent tank 3B is injected from the first nozzle 2A and the second nozzle 2B, respectively. At this time, the solvent in the first solvent tank 3A and the second solvent tank 3B is sprayed under pressure toward the inner wall surfaces 12A, 13A, 14A of the recovery tank 11 by compressed air, and the inner wall surfaces 12A, 13A, 14A are cleaned. be done.

Next, during the middle stage of the supply of compressed air, the solvent remaining in the first solvent tank 3A and the second solvent tank 3B is mixed with the compressed air and forms droplets from the first nozzle 2A and second nozzle 2B, respectively. Injected. The inner wall surfaces 12A, 13A, and 14A of the recovery tank 11 are cleaned by the high-speed droplets in which the two fluids, the solvent and the compressed air, are mixed.

In the final stage when the solvent in the first solvent tank 3A and the second solvent tank 3B is exhausted, only compressed air is injected from the first nozzle 2A and the second nozzle 2B, respectively, so that the inner wall surface 12A of the recovery tank 11 , 13A, and 14A are cleaned by this air blow. Thereby, deposits adhering to the inner wall surfaces 12A, 13A, and 14A of the recovery tank 11 are removed before they solidify.

In this way, in the deposit removal device 1 of this embodiment, in order to obtain strong cleaning power, solvent injection using compressed air at a predetermined pressure (step 1), and two-fluid injection of compressed air at a predetermined pressure and a solvent are performed. Three steps are performed in sequence: high-speed jetting of droplets (step 2) and air blowing with compressed air at a predetermined pressure (step 3).

As a result, in step 1, mainly large particles of solvent are sprayed to wet the adhered solid powder and float it up from the inner wall surfaces 12A, 13A, 14A, and then in step 2, compressed air and solvent are sprayed. A three-step cleaning process is performed in which a two-fluid jet blows off the liquid film containing solid powder, and finally, in step 3, compressed air blows off the droplets remaining on the wall. By making the boundary layers 12A, 13A, and 14A thinner, the solid powder of the slurry can be removed with a smaller amount of solvent.

In addition, the pressure of compressed air is set at a constant pressure during the above three steps. That is, in the early stage of compressed air supply, the solvent in the first solvent tank 3A and the second solvent tank 3B is injected from the first nozzle 2A and the second nozzle 2B, respectively, and in the middle stage, the solvent in the first solvent tank 3A and the second solvent tank 3B is injected. Droplets containing a mixture of the solvent remaining in the solvent tank 3B and compressed air are injected from the first nozzle 2A and the second nozzle 2B, and at the final stage when the solvent in the first solvent tank 3A and the second solvent tank 3B is exhausted. The pressure of the compressed air is set to a predetermined constant pressure so that the compressed air is injected from the first nozzle 2A and the second nozzle 2B.

In addition, in this embodiment, a configuration will be described in which the first solenoid valve 43, the second solenoid valve 45A, and the third solenoid valve 45B are all opened to inject from both the first nozzle 2A and the second nozzle 2B. However, it is also possible to open only one of the second solenoid valve 45A or the third solenoid valve 45B to inject, if necessary. Furthermore, the number of solvent tanks and nozzles can be increased or decreased as desired.

INDUSTRIAL APPLICABILITY The present invention is useful as a deposit removal device and a deposit removal method for removing deposits adhering to a wall surface, and a slurry recovery device. It is suitable as a deposit removal device and a deposit removal method that can prevent solidification, and a slurry recovery device.

1 Deposit removal device 2A First nozzle 2B Second nozzle 3A First solvent tank 3B Second solvent tank 4 Air supply section 40 Pressure reducing valve 41 Pressure control valve 42 Pressure gauge 43 First solenoid valve 44 Air filter 45A Second solenoid valve 45B Third solenoid valve 46A, 46B Check valve 5 Solvent supply unit 50 Solvent supply tank 51 Pump 52A Fourth solenoid valve 52B Fifth solenoid valve 53A, 53B Check valve 6A First pipe 6B Second pipe 10 Slurry recovery device 11 Recovery tank 12 Chamber 13 Recovery section 14 Lid

Claims (5)

A deposit removal device for removing deposits adhering to the inner wall surface of a recovery tank for collecting slurry,
a nozzle that injects toward the inner wall surface of the recovery tank;
a solvent tank filled with a predetermined amount of solvent;
piping connecting the upper part of the solvent tank and the nozzle;
An air supply unit that supplies compressed air to the lower part of the solvent tank, and in the initial stage of supplying the compressed air, the solvent in the solvent tank is injected from the nozzle, and in the middle stage, the solvent remaining in the solvent tank is injected. and the compressed air are jetted from the nozzle, and the pressure of the compressed air is set so that the compressed air is jetted from the nozzle at the final stage when the solvent in the solvent tank is exhausted. A deposit removal device including a supply section. The nozzle includes a first nozzle disposed at an upper portion within the recovery tank and a second nozzle disposed at a lower portion within the recovery tank,
The solvent tank has a first solvent tank filled with the solvent supplied to the first nozzle, and a second solvent tank filled with the solvent supplied to the second nozzle,
Claim 1: The piping includes a first piping that connects the upper part of the first solvent tank and the first nozzle, and a second piping that connects the upper part of the second solvent tank and the second nozzle. The deposit removal device described. The deposit removal device according to claim 1 or 2, further comprising a solvent supply section that supplies a predetermined amount of solvent to the solvent tank. A deposit removal method for removing deposits adhering to the inner wall surface of a recovery tank for collecting slurry, the method comprising:
By supplying compressed air set at a predetermined pressure to the lower part of a solvent tank filled with a predetermined amount of solvent, the solvent in the solvent tank is removed from the solvent tank at the initial stage of supplying the compressed air. The nozzle is injected from the nozzle toward the inner wall surface of the recovery tank through a pipe connecting the upper part of the solvent tank and the nozzle. A method for removing deposits, characterized in that the compressed air is injected from a nozzle, and the compressed air is injected from the nozzle at a final stage when the solvent in the solvent tank is exhausted. A slurry recovery device comprising the deposit removal device according to claim 1 or 2.

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