JP7344100B2 - Water removal equipment for loose materials - Google Patents

Description

The present invention relates to an apparatus for removing moisture adhering to the surface of powder and granular materials called "bulk materials" that are not packaged in bags, such as crushed stone, coal, earth and sand, and grains.

Bulk materials are defined as a term in JISB8805 and refer to lumps, grains, and powder-like objects that are not packaged in bags, and specific examples include ores, coal, earth and sand, and grains.
For example, in the production of crushed stone, raw ore mined at a quarry face is first crushed in a coarse crusher, and then impurities such as mud attached to the surface of the crushed ore are removed. After washing with water to remove fine particles using a washing screen (sieve), the crushed stone is fed to a secondary crusher and sieve device for product production, and crushed stone with the required particle size is sorted. was.
In addition, in the production of coal, lump coal mined at the face of a coal mine is sieved using a sieving device into any size desired by the customer, and the fine powder that adheres to the surface of the sieved coal particles is removed. In order to remove this, the product goes through a charcoal washing process using a water-washing screen (sieve) before being shipped as a product.

The fine particles of loose material separated under the sieve of such a water-washing screen are obtained in a wet state containing a large amount of water sprayed in the water-washing step. For example, when this wet lime sand is put into a pulverizer to be used as a raw material for calcium carbonate powder, etc., the large amount of moisture contained in the sand causes it to settle inside the pulverizer, resulting in poor pulverization efficiency. Not only that, but it also damaged the crusher, so it was necessary to use fossil fuel as a heat source and dry it before use.
However, since the distribution price of bulk crushed stone is low, it is not possible due to energy flow and cost considerations to use the wet crushed stone generated during the production process through processes such as drying. It was not possible to make effective use of it.
In addition, when it comes to coal, by removing the fine powder adhering to the surface of the sieved coal particles through coal washing, it is possible to prevent dust from being generated during transport or at the coal storage site. Getting wet with water has led to problems such as increased transportation costs and poor ignitability as fuel.

For this reason, in the case of crushed stone among bulk materials, this wet subsieve crushed stone cannot be used as a raw material for coal powder, etc. They have to be disposed of along with the soil, which not only makes it impossible to utilize resources effectively, but also puts pressure on the volume of the dumping sites where they are disposed of, and a solution to this problem was desperately needed.

Patent Document 1 describes a wet powder transfer dehydration device. This device is a dewatering device in which a conveyor is constructed by extending a mesh-like endless belt between a starting end rotating body and a terminal rotating body, and a water container is arranged between an upper belt and a lower belt of the endless belt. Transfer and dewatering are performed by placing wet powder such as sand after wet classification on an upper belt and transporting it on a conveyor, while water passes through the mesh of the upper belt and is collected in a water container. .
However, in this transfer dewatering device, wet powder such as crushed stone is dehydrated while being transferred horizontally on an endless belt, and therefore, there is a problem in that the device itself becomes large. Furthermore, since water containing fine powder passes through the mesh-like endless belt in the vertical direction due to its weight, there is also a problem that the mesh constituting the endless belt is likely to become clogged.

Patent Document 2 describes a dewatering device that includes an upper plate portion formed in a disk shape and rotating in the circumferential direction of the disk, and a cylindrical centrifugal separation container in which the upper plate portion is disposed. The object to be dehydrated is placed on the upper plate, and as the upper plate rotates, the object to be dehydrated on the upper plate is blown away by centrifugal force, and is attached to the cylindrical inner wall of the centrifuge container to separate water. I am planning to do so.

The wet powder dehydration devices described in Patent Documents 1 and 2 both require expensive devices. For this reason, even though it could technically be used to dry bulk products, it could not be adopted due to the low retail price of bulk products.
In addition, as a prior invention, the present applicants have proposed that air is blown onto loose objects falling along a collision dehydration plate hanging vertically, and the loose objects collide with the collision dehydration plate due to the air to remove moisture. The company has filed a patent application for a water removal device that does this (Japanese Patent Application No. 2019-204523).
However, in this prior invention, there was a limit to the dewatering ability because the impact dewatering plate was only one that hung vertically.

Patent No. 4646338 JP 2009-125709

The present invention overcomes the problems of the conventional technology and provides a moisture removal device that can be used to efficiently remove moisture and dry wet bulk materials while overcoming energy flow and cost constraints. It provides:

The apparatus for removing moisture from bulk materials according to the present invention uses heated high-pressure air to discharge moist bulk materials passing through the gap between the first and second collision dewatering plates and the air discharge port from the air discharge port. The loose objects are blown away and collided with the first collision dehydration plate, and the moisture separated by the collision falls below the collision dehydration plate, and the moisture is removed while sliding down the slope of the second collision dehydration plate. After that, the separated moisture is collected from the bulk material collection port, and the separated moisture passes through a collision dehydration plate together with air, moves to the back side of the collision dehydration plate, and is discharged from a moisture discharge port installed below. be.

The apparatus for removing moisture from loose materials of the present invention includes the following configuration.
(1) A first collision dehydration plate hanging down in the vertical direction and a second collision dehydration plate arranged at an inclined angle thereto are arranged,
An input hopper is provided on one side of the first collision dewatering plate to drop and supply wet bulk materials, and the bulk materials input from the input hopper fall along the first collision dewatering plate, and further It has a structure that allows it to slide down the slope formed by the second collision dewatering plate.
An air discharge port to which an air nozzle having an injection port facing one surface of the first and second collision dehydration plates is fixed is disposed on one surface side of the first and second collision dehydration plates.
Equipment for removing moisture from loose materials.
(2) On the other side of the first and second collision dewatering plates, a moisture outlet for discharging the moisture removed from the wet bulk material is arranged, and below the second collision dehydration plate, a moisture outlet is arranged. . The apparatus for removing moisture from loose materials according to (1), characterized in that the apparatus includes a bulk material collection port for recovering the bulk materials from which moisture has been removed.
(3) The device for removing moisture from loose materials according to any one of (1) and (2), wherein the inclination angle is adjusted depending on the degree of moisture removal by hot air.
(4) The collision dewatering plate is fixed so as to be replaceable with one having a different mesh-like gap interval depending on the particle size of the bulk material from which moisture is to be removed. The apparatus for removing moisture from loose materials according to any one of the above.
(5) The air discharge ports are installed in multiple stages in the vertical direction along the first and second impingement dewatering plates depending on the degree of moisture removal required from the wet bulk materials, (1) The apparatus for removing moisture from loose materials according to any one of (4).
(6) The moisture removal of loose materials according to any one of (1) to (5), wherein the air discharge port can change the angle of the air nozzle and finely adjust the direction of air discharge. Device.
(7) The apparatus for removing moisture from loose materials according to any one of (1) to (6), wherein the air discharge port has a function of adjusting the temperature and pressure of the air ejected from the air nozzle.
(8) The apparatus for removing moisture from crushed stone as described in any one of (1) to (7), which removes moisture from crushed stone as the bulk material.

According to the moisture removal device of the present invention, since the first and second collision dehydration plates are installed vertically and in an inclined direction, the loose materials that collide with these plates and have moisture removed fall downward due to gravity. Therefore, clogging of the collision dewatering plate does not occur. Even if it does become clogged, it can be easily cleared by backwashing from the back side of the collision dewatering plate.
In addition, by replacing collision dewatering plates with different meshes, it is possible to remove water according to the particle size of the bulk material to be removed. Furthermore, by increasing the number of vertically installed air discharge ports, water can be removed. It is also possible to increase the degree of

Schematic diagram of moisture removal equipment Front view and cross-sectional view of collision dewatering plate (wedge wire screen) Air discharge port perspective view

Next, a mode for carrying out the present invention will be described. This embodiment is an example of the moisture removal device of the present invention, and the present invention is not limited to this embodiment.

As is clear from FIG. 1, the moisture removal device 1 of the present invention includes a first collision dewatering plate 11, a second collision dewatering plate 12, an air discharge port 13, an input hopper 14, a bulk material collection port 15, a moisture drain The outlet 16 is the main component. Further, the first and second collision dehydration plates and the air discharge port are included in the dehydration area, and the water removal device of the present invention has two dehydration areas. One is a vertical dewatering area disposed directly below the input hopper, and the other is an inclined dewatering area obliquely disposed below the vertical dewatering area. Further, a moisture discharge port is provided at the bottom of each dewatering region, and a loose material collection port is provided at the bottom of the inclined dewatering region. Each component will be explained below.

(Collision dewatering plate)
The collision dewatering plate in the present invention is a rigid plate having a large number of mesh-like gaps. In other words, when a loose object blown away by the air discharged from the air outlet collides with the impact dehydration plate, the loose object whose moisture has been separated and removed by the impact of the collision falls downward without adhering to the impact dehydration plate, becoming damp. Moisture that comes flying along with the loose material passes through the mesh-like gaps of the collision dewatering plate together with air, and is collected and discharged at a moisture outlet installed on the back side of the collision dehydration plate.
The collision dewatering plate according to the present invention has such a function, and the material, mesh spacing, etc. can be selected depending on the type of bulk material.

Specific examples of collision dewatering plates include wedge wire screens, expanded metals, punched plates, woven nets, welded wire nets, urethane nets, canvas, and nonwoven fabrics.
For example, a wedge wire screen is suitable for removing moisture from crushed stone or earth and sand as loose materials. This will be discussed later. In addition, a fine mesh mesh is suitable for removing moisture from coal or earth and sand, and since grains can be easily crushed, a mesh with some flexibility is preferable.
It is also possible to rotate a long canvas or nonwoven fabric by connecting one end and the other end endlessly, and configure one side of the canvas that is moving as it rotates as a collision dewatering plate.

(wedge wire screen)
A wedge wire is a metal wire that has an inverted triangular cross-sectional shape, and a wedge wire screen (hereinafter abbreviated as WW screen) is made by arranging wedge wires at equal intervals to suit the application. It is formed by forming and fixing slits.
When a fluid containing solid matter (loose matter) tries to pass through the WW screen from the smooth surface side of the WW screen, the slits formed in the WW screen widen toward the back surface of the screen. Solid objects larger than the width are restrained with only two points of contact between the wedge wires. For this reason, solid matter does not easily clog, and even if it does, it can be easily backwashed, making it easy to maintain.
In addition, each wedge wire has high strength because it is fixed to the support member by welding, and since the screen surface is smooth, the degree of wear is constant and the durability is high.

In one embodiment of the present invention, the WW screen is installed vertically so that the wedge wires forming the WW screen are oriented vertically, so that solid objects that cannot pass through the slits of the WW screen collide with the WW screen. After that, it will fall downward. Since gravity acts on solids, solids that cannot pass through the WW screen are rarely fixed between the slits.
In addition, the moisture adhering to the solid material passes through the WW screen together with fine crushed stones whose particle diameter is smaller than the slit width of the WW screen, and is discharged from the moisture outlet installed below the back side of the WW screen.

(Air discharge port)
As shown in FIG. 3, the air discharge port is a device in which an air nozzle having a jet port facing one side of the collision dewatering plate is fixed in the horizontal direction. When moist bulk materials are dropped from the input hopper or vertical dehydration area and pass between the collision dehydration plate and the air outlet, the air jetted from the air nozzle blows the moist bulk materials against the collision dehydration plate and causes them to collide. let

In the present invention, by changing the air jetting pressure, the speed of the blown loose objects is increased, so that the water removal efficiency when they collide with the collision dewatering plate is improved. Furthermore, by using hot air as the air ejected from the air nozzle, it is possible to utilize the evaporation of moisture from the damp bulk material, which is effective in promoting drying.
In addition, in the inclined dehydration area, hot air is discharged from the air outlet, and the passage time of the loose objects is longer than that in the vertical dehydration area, so it is possible to further accelerate the drying of the loose objects. be.
Furthermore, by providing a function of adjusting the direction of air discharge from the air discharge port by changing the angle of the air nozzle, more efficient moisture removal can be performed.

Additionally, if multiple air outlets are arranged in the vertical direction, while the dropped wet loose objects are falling, the loose objects will be subjected to the moisture removal process as many times as the number of air outlets arranged. become. For this reason, the degree of water removal progresses further.

(Other components)
The electromagnetic feeder is a device that uniformly conveys moist bulk materials to the input hopper from which moisture is removed using this moisture removal device. It is preferable that the design is such that the wet bulk material is evenly dumped into the input hopper without creating "clumps".
The input hopper is a device that drops wet bulk materials from above between the collision dewatering plate and the air outlet. Preferably, the design is such that a substantially uniform amount of wet loose material can be dropped downward.
The bulk material collection port is a collection port for collecting loose materials that have collided with the collision dewatering plate and have fallen while having their moisture removed. Further, the moisture passes through the collision dewatering plate and is discharged from the recovered moisture outlet.

EXAMPLES The present invention will be described in more detail below using Examples, but the present invention is not limited to these Examples.

A water removal device shown in FIG. 1 was used. The external dimensions of the moisture removal device as seen from the viewpoint A side are 1150 mm in height and 350 mm in width.
Air discharge ports are arranged in the vertical direction of the collision dehydration plate, one in the vertical dehydration area and two in the inclined dehydration area, and hot air heated to 350°C is ejected at a pressure of 0.25 MPa from each air nozzle. did.
For the wet bulk material, 1.8 kg of crushed limestone containing 8.8% water and having a particle size of 1 to 3 mm was charged at a rate of 3 tons per hour.
By applying the moisture removal treatment of the present invention, crushed limestone with a moisture content of 1.1% could be recovered. The water removed was 0.15 kg, and the water reduction rate was 7.7%.

By applying the moisture removal treatment of the present invention, 1.8 kg of crushed limestone with a particle size of 1 to 3 mm containing 8.8% moisture can be reduced to a moisture content of 1.1% in a short time (about 3 seconds). I was able to reduce it. Therefore, it is possible to remove moisture from crushed limestone in a short time at low cost, and it has become possible to efficiently remove moisture from bulk materials.

The apparatus for removing moisture from bulk materials according to the present invention can be applied to removing moisture from bulk materials, which has conventionally been carried out using expensive centrifugal dehydrators, dryers, and the like. The bulk material obtained by removing moisture can be used as a raw material for powders such as charcoal powder, and can also be shipped directly as a product.

1 Moisture removal device 11 First collision dewatering plate 12 Second collision dewatering plate 13 Air discharge port 14 Input hopper 15 Loose material collection port 16 Removed material (moisture) discharge port

Claims (8)

A first collision dehydration plate hanging down in the vertical direction and a second collision dehydration plate disposed at an inclined angle thereto are arranged,
An input hopper is provided on one side of the first collision dewatering plate to drop and supply wet bulk materials, and the bulk materials input from the input hopper fall along the first collision dewatering plate, and further It has a structure that allows it to slide down the slope formed by the second collision dewatering plate.
An air outlet to which an air nozzle having an injection port facing one side of the first collision dehydration plate is fixed is disposed on one side of the first collision dehydration plate, and the second collision dehydration plate An air outlet with an air nozzle fixed to the upper surface of the plate having an injection port directed toward the lower surface is arranged.
Equipment for removing moisture from loose materials. On the other side of the first and second collision dehydration plates, a moisture discharge port for discharging the moisture removed from the wet bulk material is disposed, and below the second collision dehydration plate, a moisture discharge port is disposed on the other side of the first and second collision dehydration plates. 2. The apparatus for removing moisture from loose materials according to claim 1, further comprising a bulk material collection port for recovering the removed bulk materials. 3. The apparatus for removing moisture from loose materials according to claim 1, wherein the inclination angle is adjusted depending on the degree of moisture removal by hot air. 4. The collision dewatering plate is fixed so as to be replaceable with one having a different mesh gap interval depending on the particle size of the bulk material from which moisture is to be removed. Equipment for removing moisture from loose materials. Any one of claims 1 to 4, wherein the air discharge ports are installed in multiple stages in the vertical direction along the first and second impingement dewatering plates depending on the degree of moisture removal required from the wet bulk material. A device for removing moisture from loose materials as described in Crab. 6. The apparatus for removing moisture from loose materials according to claim 1, wherein the air discharge port can change the angle of the air nozzle and finely adjust the direction of air discharge. The apparatus for removing moisture from loose materials according to any one of claims 1 to 6, wherein the air discharge port has a function of adjusting the temperature and pressure of the air jetted from the air nozzle. The apparatus for removing moisture from crushed stone according to any one of claims 1 to 7, which removes moisture from crushed stone as the bulk material.

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