JP7039666B1 - Slurry recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slurry recovery device having a simple structure, capable of avoiding an increase in size of the device, and capable of reducing the amount of slurry disappearance (improving the slurry recovery rate). SOLUTION: A slurry collecting device 10 is provided in a cylindrical chamber 1 in which an axial center 1c is held in an upright state, a lid 2 for closing an upper end opening 1a of the chamber 1, and a lower portion of the chamber 1. A funnel-shaped recovery portion 3, an exhaust path 4 arranged so as to penetrate the center of the lid 2 of the chamber 1 and a lower portion 4a located in the chamber 1, and a slurry which is a liquid containing solid particles. It is provided with an air supply path 5 that penetrates the lid 2 and is arranged so that the lower end opening 5a is located in the chamber 1 in order to introduce a gas flow that is supplied in a mist-like mixed state. At the lower part of the air supply path 5, an elbow 5b that blows a gas flow (air flow) supplied into the chamber 1 via the air supply path 5 in a direction forming a twisting positional relationship with the axial center 1c of the chamber 1 is provided. It is provided. [Selection diagram] Fig. 1

Description

The present invention relates to a slurry recovery device that separates and recovers a slurry from a gas stream supplied in a state where the slurry, which is a liquid containing solid particles, is mixed in the form of mist.

Described in Patent Document 1, for example, as a device for accelerating a liquid containing solid particles by a gas flow to form fine droplets in a fluid state and colliding the fine droplets to atomize the solid particles into fine particles. There is a "micronization device" and the like. In the "atomization apparatus" described in Patent Document 1, FIGS. 11 and 12 in Patent Document 1 are used as means for collecting fine droplets after being atomized by collision with a collision surface as a slurry. However, in recent years, the slurry recovery device 101 as shown in FIG. 5 has been used in order to reduce the amount of slurry lost in the recovery process and improve the slurry recovery rate. ..

The slurry recovery device 101 shown in FIG. 5 is used to recover the slurry from the gas flow (air flow) supplied from the atomizing device 100 in a state where the slurry, which is a liquid containing solid particles, is mixed in the form of mist. Will be done. The slurry recovery device 101 penetrates a cylindrical chamber 103 having a funnel-shaped recovery portion 102 below, a partition wall 104b and a lid 104a arranged so as to cover the upper end opening of the chamber 103, and a lid 104a. The air supply pipe 105 is arranged so that the lower end opening 105a is located in the chamber 103 below the partition wall 104b, and the upper hopper 106 and the lower hopper 107 are arranged directly under the lower end opening 105a of the air supply pipe 105. , A spray 108 or the like that ejects a liquid toward the recovery unit 102 in the chamber 103 is provided.

The liquid containing solid particles supplied via the liquid supply pipe 110 is accelerated by the gas flow supplied via the gas supply pipe 109 and becomes fine droplets in a flowing state and sent to the micronization processing unit 111. Then, the solid particles are atomized into fine particles by colliding the fine droplets in the micronization processing unit 111, and the slurry, which is a liquid containing the solid particles, becomes a gas flow in which they are mixed in a mist shape to form the air supply pipe 105. It is supplied to the slurry collecting device 101 via the slurry collecting device 101.

The gas flow supplied to the slurry recovery device 101 is decelerated by pressure loss as it passes through the upper hopper 106 and the lower hopper 107 and flows down to the recovery unit 102, and fine droplets (solid particles) contained in the gas flow are removed. The liquid contained) falls on the inner peripheral surface 102a of the collecting unit 102 and becomes a slurry state, flows down along the inner peripheral surface 102a together with the liquid blown out from the spray 108, and flows down along the inner peripheral surface 102a, and is a predetermined collection container (containing liquid) via the collecting pipe 112. (Not shown). The gas flow after passing through the upper hopper 106 and the lower hopper 107 abuts on the inner peripheral surface 102a of the recovery unit 102, rises, passes through the penetration portion 104c of the partition wall 104b, and passes through the exhaust duct 113 to determine the predetermined exhaust gas. It is sent to the unit (not shown).

On the other hand, a cyclone device has been conventionally known as a device capable of continuously collecting dispersed powder from a gas stream containing the dispersed powder, but as a device related to the present invention, for example, in Patent Document 2. There is a described "cyclone device" and the like.

The "cyclone device" described in Patent Document 2 has a cyclone body portion having an almost upright cylindrical shape, and the cyclone for blowing an air flow containing dispersed powder in the horizontal direction along the inner wall surface of the cyclone body portion. It penetrates the powder introduction part provided by extending a part of the body part in the tangential direction of the outer circumference and the central part of the top covering the upper part of the cyclone body part in order to exhaust the air in the cyclone body part upward. It is provided with an exhaust unit provided and a secondary air introduction unit that introduces secondary air in the tangential direction of the cyclone body portion at a position of 45 to 180 degrees from the powder introduction unit.

Japanese Patent No. 4447042 Japanese Patent No. 44229772

Since the slurry recovery device 101 shown in FIG. 5 has a large number of parts in the upper hopper 106, the lower hopper 107, and the partition wall 104b and has a complicated structure, the gas supplied to the slurry recovery device 101 via the air supply pipe 105. A large amount of slurry contained in the flow adheres to these parts, which is a factor that lowers the recovery rate of the slurry collected via the recovery pipe 112.

Further, since the structure of the slurry recovery device 101 shown in FIG. 5 is complicated, the liquid ejected from the spray 108 may not reach the entire inside of the chamber 103 and the recovery unit 102, so that the liquid can be recovered. It is not possible to clean the inner peripheral surface 102a of the portion 102 without leaving any slurry component attached to the inner peripheral surface 102a or the like.

Further, in the slurry recovery device 101 shown in FIG. 5, since the liquid is blown out from the spray 108 directly downward, minute droplets contained in the gas flow flowing in the chamber 103 are rolled up and various members in the chamber 103 are rolled up. The small droplets that adhere to the surface or are rolled up are discharged through an exhaust duct (not shown) that communicates with the chamber 103 together with the exhaust, which causes an increase in the amount of slurry disappeared.

On the other hand, the "cyclone device" described in Patent Document 2 can be suitably used in the technical field of recovering dispersed powder from a gas stream containing dispersed powder, but is a liquid containing solid particles. It is not suitable for the technical field of separating and recovering a slurry from a gas flow supplied in a state where the slurry is mixed in the form of mist.

Further, in the "cyclone device" described in Patent Document 2, the powder introduction portion for blowing the air flow containing the dispersed powder in the horizontal direction along the inner wall surface of the cyclone body portion is the cyclone body portion. Since a part of the device is extended in the tangential direction of the outer circumference, it is easy to increase the size of the entire device.

Therefore, the problem to be solved by the present invention is a slurry having a relatively simple structure, avoiding an increase in the size of the device, and reducing the amount of slurry disappearance (improving the slurry recovery rate). To provide a recovery device.

The slurry recovery device according to the present invention is
A cylindrical chamber with its axis held upright, and
A lid that closes the upper end opening of the chamber and
A funnel-shaped collection section provided below the chamber,
An exhaust path that penetrates the center of the lid of the chamber and is arranged so that the lower portion is located in the chamber.
A supply disposed in such a state that the lower end opening is located in the chamber through the lid body in order to introduce a gas flow supplied in a state where the slurry which is a liquid containing solid particles is mixed in a mist shape. With an air passage,
Below the air supply path, the gas flow supplied into the chamber via the air supply path is blown out in a direction forming a twisted positional relationship with the axial center of the chamber, and the chamber and the recovery unit . An elbow that generates a swirling flow that rotates spirally around the axis is provided inside the chamber.
The peripheral edge of the air supply path forming the lower end opening of the air supply path is an oblique intersection that coincides with an orthogonal peripheral edge portion that coincides with a virtual plane orthogonal to the axis and a virtual plane that diagonally intersects the axis. It has a peripheral edge portion, the oblique peripheral edge portion is provided on the half peripheral portion of the entire peripheral edge of the lower end opening of the air supply path, which is closer to the inner peripheral surface of the chamber, and the orthogonal peripheral edge portion is provided on the remaining half circumference. Provided in the part
In the chamber, a spray that blows out a liquid in a direction forming a twisted positional relationship with the axis of the chamber is provided on the lower surface side of the lid and the peripheral wall of the chamber.
The spray provided on the lower surface side of the lid is arranged above the lower end opening of the elbow, and the swirling flow is located above the center of the region where the air flow blown from the lower end opening collides with the inner peripheral surface of the chamber. The liquid can be blown toward the upstream side of the
The spray provided on the peripheral wall of the chamber blows out liquid on the inner peripheral surface of the chamber toward the upstream side of the swirling flow from the region above the inner peripheral surface of the collecting portion and to which the slurry adheres. It is possible,
The two sprays are characterized in that they can be operated alternately .
Here, the positional relationship of the twist means that the two straight lines are not parallel to each other and do not intersect with each other.

In the slurry recovery device, in the chamber, a spray that blows out a liquid in a direction forming a positional relationship between the axis of the chamber and the twist is provided on the lower surface side of the lid and the peripheral wall of the chamber .

In the slurry recovery device,
The particle size of the solid particles contained in the slurry is 0.5 μm or more and 20 μm or less.
The mass concentration of the solid particles contained in the slurry is 5 wt% or more and 50 wt% or less.
The density of solid particles contained in the slurry is 3 g / cm ³ or more and 20 g / cm ³ or less.
It is desirable that the viscosity of the slurry is 1 mPa · S or more and 1000 mPa · S or less.

In the slurry recovery device, the gas flow obtained by dividing the volumetric flow rate (m ³ / S) of the gas flow blown out from the elbow at a temperature of 15 ° C. (standard atmospheric condition) by the cross-sectional area (m ² ) of the elbow. It is desirable that the speed is 5 m / sec or more and 50 m / sec or less.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a slurry recovery device having a relatively simple structure, which can avoid an increase in size of the device and can reduce the amount of slurry disappearance (improve the slurry recovery rate). ..

It is a partially omitted vertical sectional view which shows the slurry recovery apparatus which is an embodiment of this invention. It is a partially omitted enlarged view of the slurry recovery device shown in FIG. It is a partially omitted horizontal sectional view in line AA in FIG. It is a partially omitted view seen from the arrow X direction in FIG. It is a partially omitted vertical sectional view which shows the slurry recovery apparatus used in the conventional atomization apparatus.

Hereinafter, the slurry collecting device 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the slurry recovery device 10 is a gas supplied from a atomization device 50 arranged above the slurry recovery device 10 in a state where slurries, which are liquids containing solid particles, are mixed in a mist shape. Used to retrieve slurry from the stream.

As shown in FIGS. 1 to 4, the slurry recovery device 10 includes a chamber 1, a lid 2, a recovery unit 3, an exhaust path 4, an air supply path 5, an elbow 5b, sprays 6, 7, and the like. The chamber 1 has a cylindrical shape, and its axis 1c is held in an upright state. The upper end opening 1a of the chamber 1 is closed by a lid 2 that can be opened and closed, and a funnel-shaped collecting portion 3 is detachably attached to the lower portion of the chamber 1. The inner diameter of the lower end opening 1b of the chamber 1 and the inner diameter of the upper end opening 3a of the recovery portion 3 are the same. The inner peripheral surface of the collection unit 3 is continuously reduced in diameter downward, and the lower end opening 3b of the collection unit 3 is connected to the drainage pipe 8.

The exhaust path 4 is arranged so as to penetrate the center of the lid 2 of the chamber 1 and the lower portion 4a is located in the chamber 1. The exhaust path 4 has a cylindrical shape, and its axis 4c is arranged so as to coincide with the axis 1c of the chamber 1. The upper portion of the exhaust path 4 is connected to an exhaust unit 9 having a gas suction function.

The air supply path 5 is a cylindrical member for introducing the air flow S supplied in a state where the slurry, which is a liquid containing solid particles, is mixed in a mist shape into the chamber 1. The air supply path 5 penetrates the lid 2 of the chamber 1, is arranged in a state where the lower end opening 5a is located in the chamber 1, and an elbow 5b is provided in the lower portion of the air supply path 5. As shown in FIG. 4, the elbow 5b is curved in an L shape, and the axial center 5c of the horizontal portion 5h located near the lower end opening 5a has a twisted positional relationship with the axial center 1c of the chamber 1. Therefore, the gas flow (air flow S) supplied into the chamber 1 via the air supply path 5 is blown out in a direction (horizontal direction in the present embodiment) having a twisted positional relationship with the axial center 1c of the chamber 1. Will be done.

As shown in FIGS. 3 and 4, the peripheral edges of the air supply path 5 forming the lower end opening 5a of the air supply path 5 are an orthogonal peripheral edge portion 5d that coincides with a virtual plane orthogonal to the axial center 5c and an axial center 5c. It has an oblique peripheral edge portion 5e that coincides with a virtual plane that intersects diagonally. The oblique peripheral edge portion 5e is provided on the half peripheral portion of the entire peripheral edge of the lower end opening of the air supply path 5 closer to the inner peripheral surface 1d of the chamber 1, and the orthogonal peripheral edge portion 5e is provided on the remaining half peripheral portion. There is.

As shown in FIGS. 1 to 4, in the slurry recovery device 10, the spray 6 is provided on the lower surface side of the lid 2 of the chamber 1, and the spray 7 is provided on the peripheral wall 1w of the chamber 1. In the chamber 1, the spray 6 has a function of blowing out a liquid (for example, water, a solvent, etc.) in a direction forming a twisted positional relationship with the axial center 1c of the chamber 1 (direction 6s toward the inner peripheral surface 1d of the chamber 1). Have. The spray 7 blows out the liquid in a direction in which the axial center 1c of the chamber 1 is twisted or in a direction parallel to the axial center 1c (a plurality of directions including a direction 7s orthogonal to the inner peripheral surface 3d of the recovery unit 3). It has a function. The liquid ejection directions of the sprays 6 and 7 can be changed respectively.

The sprays 6 and 7 can be operated simultaneously or alternately, but in the present embodiment, the sprays 6 and 7 are operated alternately. The operation interval of the sprays 6 and 7 is 3 to 20 seconds, and the operation time is 1 to 2 seconds, but the operation time is not limited to this.

As shown in FIG. 1, in the slurry recovery device 10, the ratio of the inner diameter 1D of the chamber 1 to the height 1H is 1: 1, and the ratio of the inner diameter 4D of the exhaust path 4 to the inner diameter 1D of the chamber 1 is 1: 4. However, the cone apex angle 3V on the inner peripheral surface of the recovery unit 3 is set to 70 degrees, but it is not limited to these values. The ratio of 1H is in the range of 1: 1 to 1: 2, the ratio of the inner diameter 4D of the exhaust path 4 to the inner diameter 1D of the chamber 1 is in the range of 1: 3 to 1: 8, and the cone apex on the inner peripheral surface of the recovery unit 3. The angle 3V can be changed in the range of 45 degrees to 120 degrees.

Next, the usage, functions, and the like of the slurry collecting device 10 will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the exhaust unit 9 is operated to supply a gas flow (air flow) via the gas supply pipe 52 in the atomizing device 50, and also contains solid particles via the liquid supply pipe 51. When the liquid is supplied, the liquid containing the solid particles supplied via the liquid supply pipe 51 is accelerated by the gas flow supplied via the gas supply pipe 52 and becomes fine particles in a flowing state. It is sent to the processing unit 53.

In the micronization processing unit 53, the solid particles are atomized into fine particles by colliding the sent fine droplets with a collision member (not shown), and the slurry, which is a liquid containing the solid particles, is mixed in a mist shape. The air flow S is supplied to the air supply path 5 of the slurry recovery device 10 via the gas flow space 54.

As shown in FIG. 4, the air flow S supplied to the air supply path 5 is bent 90 degrees in the traveling direction by the elbow 5b, and blows out in a direction forming a twisting positional relationship with the axial center 1c of the chamber 1 to form the chamber 1. As shown in FIGS. 2 and 3, a swirling flow T that spirally rotates around the axis 1c is generated inside the chamber 1 and the recovery unit 3 because it collides with the inner peripheral surface 1d of the cyclone effect. Occurs.

Due to this cyclone effect, the slurry, which is a liquid containing solid particles contained in the air flow S, moves in a direction approaching the inner peripheral surface 1d of the chamber 1 by centrifugal force, adheres to the inner peripheral surface 1d, and then gravity. As a result, it descends toward the inner peripheral surface 3d of the recovery unit 3 along the inner peripheral surface 1d, and after reaching the inner peripheral surface 3d, descends along the inner peripheral surface 3d and flows into the drainage pipe 8, and is determined. Collected in a collection container (not shown).

Further, due to the cyclone effect, the swirling flow T near the axis 1c in the chamber 1 is sucked into the exhaust path 4 from the lower end opening 4b of the exhaust path 4 after the slurry content is significantly reduced. It flows into the exhaust unit 9 via the exhaust path 4.

On the other hand, as shown in FIGS. 1 and 2, the spray 6 is arranged above the lower end opening 5a (see FIGS. 3 and 4) of the elbow 5b, and the air flow S blown out from the lower end opening 5a is inside the chamber 1. The liquid can be blown toward the upstream side of the swirling flow T from the center of the region that collides with the peripheral surface 1d. Further, the spray 7 can blow out the liquid on the inner peripheral surface 1d of the chamber 1 toward the upstream side of the swirling flow T from the region above the inner peripheral surface 3d of the recovery unit 3 and to which the slurry adheres.

As described above, by alternately operating the sprays 6 and 7 at intervals of 3 to 60 seconds for 1 to 2 seconds, the inner peripheral surface 1d of the chamber 1 and the inner peripheral surface 3d of the recovery unit 3 are operated. The attached slurry can be swiftly flowed down toward the drainage pipe 8.

As described above, in the slurry recovery device 10, the cyclone effect is generated by generating the swirling flow T in the chamber 1, and it is possible to prevent large particles such as slurry, droplets, and solid particles from being mixed into the exhaust gas. Since the adhesion of slurry and the like to the inner peripheral surface 1d of the chamber 1 and the inner peripheral surface 3d of the recovery unit 3 can be reduced, the amount of slurry disappearance can be reduced (the slurry recovery rate can be improved).

When the slurry recovery device 10 shown in FIG. 1 and the conventional slurry recovery device 101 shown in FIG. 5 are operated under the same conditions, in the slurry recovery device 10, the solid particles and the slurry recovery device that are mixed and disappear in the exhaust gas. The amount of slurry adhering and accumulating in 10 was reduced, and the amount of slurries containing solid particles disappeared by 40% or more as compared with the slurry recovery device 101.

Since the slurry recovery device 10 has a simpler structure than the conventional slurry recovery device 101, the number of parts can be reduced, the manufacturing cost can be reduced, and the cleaning time after operating the slurry recovery device 10 can be reduced. Has also been shortened, and maintainability has improved dramatically. Further, since the slurry recovery device 10 has a simple structure of the chamber 1 and the recovery unit 3, the slurry adhering to the lower portion of the inner peripheral surface 1d of the chamber 1 and the inner peripheral surface 3d of the recovery unit 3 is sprayed. It can be easily washed away by the liquid blown out from No. 7 and can be efficiently recovered.

As described above, in the slurry recovery device 10, the efficiency of the slurry contained in the air flow S in which the slurry, which is a liquid containing solid particles, supplied via the liquid supply pipe 51 is mixed in a mist shape is efficient. It is possible to collect various types and properties of slurry, but for example,
The particle size of the solid particles contained in the slurry is 0.5 μm or more and 20 μm or less.
The mass concentration of the solid particles contained in the slurry is 5 wt% or more and 50 wt% or less.
The density of solid particles contained in the slurry is 3 g / cm ³ or more and 20 g / cm ³ or less.
It is desirable that the viscosity of the slurry is 1 mPa · S or more and 1000 mPa · S or less.

Further, the velocity of the air flow S blown out from the elbow 5b of the air supply path 5 can be arbitrarily set. For example, the volumetric flow rate (m) of the air flow S blown out from the elbow 5b at a temperature of 15 ° C. (standard atmospheric state). It is desirable that the air flow velocity obtained by dividing ³ / S) by the cross-sectional area (m ² ) of the elbow is 5 m / sec or more and 50 m / sec or less.

The slurry recovery device 10 described with reference to FIGS. 1 to 4 shows an example of the slurry recovery device according to the present invention, and the slurry recovery device according to the present invention is limited to the above-mentioned slurry recovery device 10. It is not something that will be done.

The slurry recovery device according to the present invention is widely used in various industrial fields that require the work of separating and recovering a slurry from a gas stream supplied in a state where the slurry, which is a liquid containing solid particles, is mixed in a mist form. It can be used.

1 Chamber 1a, 3a Upper end opening 1b, 4b, 5a Lower end opening 1c, 4c, 5c Axis center 1d, 3d Inner peripheral surface 1D Chamber inner diameter 1H Chamber height 2 Lid 3 Recovery part 3V Conical apex angle 4 Exhaust Path 4a Lower part 4D Inner diameter of exhaust path 5 Air supply path 5b Elbow 5d Orthogonal peripheral part 5e Oblique peripheral part 5h Horizontal part 6,7 Spray 8 Drainage pipe 9 Exhaust unit 10 Slurry recovery device 50 Slurry recovery device 51 Liquid supply piping 52 Gas supply pipe 53 Miniaturization processing unit 54 Gas flow space S Air flow (gas flow)
T swirl flow

Claims (3)

A cylindrical chamber with its axis held upright, and
A lid that closes the upper end opening of the chamber and
A funnel-shaped collection section provided below the chamber,
An exhaust path that penetrates the center of the lid of the chamber and is arranged so that the lower portion is located in the chamber.
A supply disposed in such a state that the lower end opening is located in the chamber through the lid body in order to introduce a gas flow supplied in a state where the slurry which is a liquid containing solid particles is mixed in a mist shape. With an air passage,
Below the air supply path, the gas flow supplied into the chamber via the air supply path is blown out in a direction forming a twisted positional relationship with the axial center of the chamber, and the chamber and the recovery unit . An elbow that generates a swirling flow that rotates spirally around the axis is provided inside the chamber.
The peripheral edge of the air supply path forming the lower end opening of the air supply path is an oblique intersection that coincides with an orthogonal peripheral edge portion that coincides with a virtual plane orthogonal to the axis and a virtual plane that diagonally intersects the axis. It has a peripheral edge portion, the oblique peripheral edge portion is provided on the half peripheral portion of the entire peripheral edge of the lower end opening of the air supply path, which is closer to the inner peripheral surface of the chamber, and the orthogonal peripheral edge portion is provided on the remaining half circumference. Provided in the part
In the chamber, a spray that blows out a liquid in a direction forming a twisted positional relationship with the axis of the chamber is provided on the lower surface side of the lid and the peripheral wall of the chamber.
The spray provided on the lower surface side of the lid is arranged above the lower end opening of the elbow, and the swirling flow is located above the center of the region where the air flow blown from the lower end opening collides with the inner peripheral surface of the chamber. The liquid can be blown toward the upstream side of the
The spray provided on the peripheral wall of the chamber blows out liquid on the inner peripheral surface of the chamber toward the upstream side of the swirling flow from the region above the inner peripheral surface of the collecting portion and to which the slurry adheres. It is possible,
A slurry recovery device in which the two sprays can be operated alternately . The particle size of the solid particles contained in the slurry is 0.5 μm or more and 20 μm or less.
The mass concentration of the solid particles contained in the slurry is 5 wt% or more and 50 wt% or less.
The density of solid particles contained in the slurry is 3 g / cm ³ or more and 20 g / cm ³ or less.
The slurry recovery device according to claim 1 , wherein the viscosity of the slurry is 1 mPa · S or more and 1000 mPa · S or less. The gas flow rate obtained by dividing the volumetric flow rate (m ³ / S) of the gas flow blown out from the elbow at a temperature of 15 ° C. (standard atmospheric condition) by the cross-sectional area (m ² ) of the elbow is 5 m / sec or more. The slurry collecting device according to claim 1 or 2 , wherein the speed is 50 m / sec or less.

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