JP6884381B2 - Mixing device for uniformly mixing two or more kinds of objects to be mixed and these with water - Google Patents

Description

The present invention is a mixing device for uniformly mixing two or more kinds of mixtures, for example, incinerator ash, cinders, and water with each other, and the content of water in the obtained mixture is less than 50% by weight. The present invention relates to a mixing apparatus characterized by the above, and a mixing method using the same.

The mixing operation of the mixture and the liquid medium is generally performed in the chemical industry as a means for promoting a solid-liquid reaction, a liquid-liquid reaction or a gas-liquid reaction, or as a means for manufacturing a product, and the mixing means is diverse and mechanical. A paddle type stirrer or a propeller type stirrer is used as a specific method. Further, there is a homogenizer or the like as a device for mixing fine powder with a liquid, but the upper limit of the particle size of the fine powder is small and it is not a lump, which is a constraint on use.

In the civil engineering field, soil and water are mixed using a horizontal rotary machine such as Trommel. Soil is an aggregate of rock fragments with a particle size distribution, which is usually agglomerated by the presence of clay. Therefore, mechanical stirring using trommel or the like cannot disperse even the particles constituting the soil in water. In other words, from the viewpoint of dispersion capacity, although Trommel is a large machine, it has insufficient stirring capacity from the viewpoint of uniform mixing.

In the field of waste incinerator ash treatment, for example, there are the following patent documents.
Patent Document 1 describes an incinerator ash treatment apparatus in which slaked lime is added and mixed with incinerator ash, then heated by a heat treatment apparatus to decompose organic chlorine compounds contained in the incinerator ash, and the cooled post-treatment ash is discharged to the outside of the system. And the method are disclosed, but there is no specific disclosure about the mixing means of the incinerator ash and the slaked lime, and it seems that these mixing is performed by the screw conveyor for transferring into the heat treatment apparatus.

Patent Document 2 describes a wet ash treatment method for stabilizing harmful substances such as heavy metals contained in incinerated ash such as wet municipal waste incineration ash and industrial waste incineration ash. It is possible to put the incineration ash into the water tank of the cooling device, pass the incineration ash discharged from the water tank by the conveyor on the slope, and inject the harmful substance treatment agent from the chemical injection nozzle installed above the incineration ash passing on the slope. It is disclosed. However, although it contains water, since the toxic substance treatment agent is only sprayed from the upper part of the solid incinerator ash, there is no means to positively mix the two, so from the viewpoint of uniform mixing, The contact between the two is inadequate.

In Patent Document 3, the first step of sprinkling water on the incineration ash, the second step of mixing the incineration ash sprinkled in the first step and the earth and stone, and then mixing the cement, and the second step were mixed. The mixture and the cement solidifying aid, which is a mixture of a solidifying agent that assists cement solidification, water from the raw water tank, and a fluidable agent that facilitates the flow of the solidifying agent and the mixture of water from the raw water tank, are mixed. A method and apparatus for treating incineration ash, including a third step of solidifying the mixed mixture in a curing yard, are disclosed. However, the watering of the incinerator ash is simply by spraying from the transfer belt conveyor, the mixing is by a screw conveyor or kneader mixer, and from the viewpoint of uniform mixing, water, cement and solidifying agents. , Solidification aids and the like are inadequately mixed.

On the other hand, Patent Document 4 describes energy saving and labor saving for causing a high-speed jet fluid of high-pressure water to collide with soil in a horizontally arranged pipe under atmospheric pressure to uniformly mix water and soil in a short time. Space devices and methods are disclosed. In such a device and method, the high-speed jet stream collides with the soil and is accelerated in the pipe, so that the massive soil is decomposed into fine particles by the shearing force, and as a result, sufficient mixing is possible from the viewpoint of uniform mixing. ..
However, when a horizontally arranged device disclosed in Patent Document 4 is used to mix, for example, incineration ash, cinders, and a heavy metal insolubilizer as a toxic substance treatment agent as a mixture, the mixture is mixed. On the other hand, if a relatively large amount of water and / or high-pressure water is not added, there is a problem that the fluidity of the mixture or the mixture is lowered in the horizontal pipe, blockage occurs in the pipe, and stable continuous operation cannot be performed. For example, if the mixture is soil with a true density of about 2.6, a relatively large amount of water and / or high pressure water relative to the mixture, for example, about 5 times the weight of the mixture water and / or High-pressure water is used (specifically, the mixture to be mixed: water weight ratio = 1: 4 to 6), and the water content in the obtained mixture far exceeds 50% by weight. On the other hand, the apparent density of incinerated ash and cinders is about 0.7, the true specific weight is about 1.0, and when the mixture is incinerated ash or cinders instead of soil, the weight ratio of the mixture to water is similar to that of soil. If so, the volume ratio of mixture: water becomes even smaller. That is, when trying to mix incinerator ash, cinders, and heavy metal insolubilizer as a toxic substance treatment agent using the horizontally arranged device disclosed in Patent Document 4, a smaller amount of water and / or high-pressure water is used. It is extremely difficult to perform stable continuous operation using the above. Further, in the horizontally arranged device disclosed in Patent Document 4, the energy for horizontally moving the mixture and water is provided by the high-pressure water.

Japanese Unexamined Patent Publication No. 06-159646 Japanese Unexamined Patent Publication No. 10-028949 Japanese Unexamined Patent Publication No. 2015-131291 Japanese Patent No. 4990326

In order to prevent the generation of harmful substances from industrial waste incineration ash and cinders, a predetermined amount of a toxic substance treatment agent, for example, a heavy metal insolubilizer, is added to the incineration ash and cinders, and the mixture is uniformly mixed to make the insolubilizer. The treated incineration ash and cinders are reused as backfill soil, etc. In this case, the insolubilizer detoxifies harmful substances by forming a chelate with heavy metals by contact with water. Therefore, contact with a small amount of water is required in advance, but if the water content in the obtained mixture becomes excessively high, equipment or process for removing excess water from the obtained mixture, the equipment or process. Further equipment and processes for treating the water generated from the ash will be required, and the unit price per weight of backfill soil will increase, and the transportation cost will also increase, resulting in an increase in equipment cost and operating cost. The product value (cost performance) will decrease due to the increase in unit price. Therefore, it is necessary to provide detoxified incinerator ash and cinders having high commercial value as backfill soil in which the toxic substance treatment agent is uniformly mixed with the incinerator ash and cinders despite the low water content. There is sex.
Under such circumstances, the problem to be solved by the present invention is to make two or more kinds of mixtures, for example, incinerator ash and cinder, and a heavy metal insolubilizer, short while keeping the water content in the obtained mixture extremely low. It is an object of the present invention to provide an energy-saving and space-saving compact mixing device capable of mixing uniformly over time and stably operating continuously.

As a result of diligent research and experiments to solve the above problems, the present inventor can use the following mixing device equipped with a tubular mixing tube using high-pressure water to generate incineration ash, cinders, and heavy metal insolubilizers. The present invention has been completed by finding that the water content in the obtained mixture can be extremely low, the mixture can be uniformly mixed in a short time, and stable continuous operation can be performed. ..

That is, the present invention is as follows.
[1] Single or a plurality of nozzles for ejecting high-pressure water of 0.5 MPa to 5 MPa in a substantially vertical direction; a nozzle having a cross-sectional area larger than the cross-sectional area of a high-speed jet fluid due to discharge of high-pressure water from the nozzle. Protective tube; an air tube arranged on the side surface of the nozzle protective tube for sucking air by the suction pressure of the high-speed jet fluid; arranged below the nozzle in the substantially vertical direction, having an upper end and a lower end. A tubular mixing pipe having a constant length and a constant cross-sectional area over the fixed length; a mixed material charging pipe for charging two or more kinds of mixed materials from the upper end of the tubular mixing pipe under atmospheric pressure; In addition, two or more kinds of objects to be mixed and water to be uniformly provided with a collision plate which is arranged below the lower end of the tubular mixing pipe and for receiving the mixture flowing down the tubular mixing pipe; A mixing device for mixing, wherein the water content in the obtained mixture is less than 50% by weight.
[2] The inner diameter (Dn) of the high-pressure water discharge port of the single nozzle is 0.5 mm to 5 mm, the high-speed fluid ejection speed is 30 to 100 m / s, and the inner diameter (D1) of the nozzle protection pipe. Is 5 to 15 mm, the nozzle protection tube length (L1) is 80 to 180 mm, the inner diameter (D2) of the tubular mixing tube is 30 to 70 mm, and the length of the tubular mixing tube (L2). Is 300 to 700 mm, the distance (L3) from the lower end of the tubular mixing tube to the collision plate is 90 to 180 mm, and the collision plate diameter (D3) is 30 mm to 210 mm, according to the above [1]. Mixer.
[3] The mixing apparatus according to the above [1] or [2], wherein the two or more kinds of the mixture to be supplied to the mixture input pipe are non-uniformly premixed.
[4] Using the mixing apparatus according to any one of the above [1] to [3], incinerator ash or cinders and heavy metal insolubilizers as two or more kinds of mixtures, and water and the incinerators are uniformly mixed. A method for producing a mixture having a water content of less than 50% by weight, which comprises a step of mixing.
[5] The incinerator ash or cinder is charged at a rate of 300 to 700 kg / hr, the heavy metal insolubilizer is charged at a rate of 15 to 35 kg / hr, and the high-pressure water discharged from the nozzle is charged at 120 kg / hr. The method according to the above [4].

By using the mixing apparatus according to the present invention, two or more kinds of a mixture, for example, incinerator ash or cinder and a heavy metal insolubilizer can be mixed in a short time while keeping the water content in the obtained mixture extremely low. , Can be mixed uniformly and can be operated stably and continuously. Further, the mixing device according to the present invention is energy-saving and space-saving, and further, the stirrer and the like do not have a mechanical drive portion, and there is no risk of potential mechanical failure. As described above, in the horizontally arranged device disclosed in Patent Document 4, the energy for horizontally moving the mixture and the water is provided by the high-pressure water, but in the mixing device according to the present invention, the mixture is provided. Since it naturally falls in the vertical direction due to gravity, the energy is extremely small because the mixture is moved, and at the same time, there is no risk of blockage.

It is the schematic of the mixing apparatus which concerns on this invention. The incinerator ash and the insolubilizer were mixed using the mixing apparatus according to the present invention to obtain a mixture of incinerator ash: insolubilizer: water (weight ratio) = 100: 5:30 (moisture content 22%). It is a photograph instead of the drawing which shows the experimental result.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an outline of the mixing device of the present embodiment.
The mixing device of the present embodiment has a single or a plurality of nozzles (1) for ejecting high-pressure water of 0.5 MPa to 5 MPa in a substantially vertical direction; from the cross-sectional area of the high-speed fluid due to the ejection of high-pressure water from the nozzles. Nozzle protection tube (2) having a large cross-sectional area; an air tube (3) arranged on the side surface of the nozzle protection tube for sucking air by the suction pressure of the high-speed fluid; substantially vertical below the nozzle. Cylindrical mixing tube (4) arranged in a direction, having an upper end and a lower end, having a constant length, and having a constant cross-sectional area over the constant length; 2 from the upper end of the tubular mixing tube under atmospheric pressure. A mixture charging pipe (5) for charging a mixture of seeds or more; and a collision plate (6) arranged below the lower end of the tubular mixing pipe and for receiving a mixture flowing down the tubular mixing pipe. ); A mixing device for uniformly mixing two or more kinds of fluids to be mixed with each other and water with these, characterized in that the water content in the obtained mixture is less than 50% by weight. It is a mixing device to be used.

A single nozzle (1) for ejecting high-pressure water of 0.5 MPa to 5 Mpa in a substantially vertical direction has, for example, a pressure of high-pressure water of 3 Mpa, an inner diameter of a discharge port of 0.8 mm, a water flow rate of 120 kg / hr, and discharge. The speed can be about 66 m / s, but there is no particular limitation. Further, the number of nozzles (1) may be a plurality of nozzles (1) as the scale is increased. In that case, the amount of water flowing is the total amount of high-pressure water discharged from the plurality of nozzles (1), but the discharge speed is as follows regardless of whether the nozzles (1) are single or plural. It needs to be optimal for the desired mixing described in detail in.
The method for producing high-pressure water is not particularly limited. For example, when incinerator ash is added at 500 kg / hr and an insolubilizer is added at 5% by weight with respect to the incinerator ash and mixed, if the amount of high-pressure water flowing is 120 kg / hr, water derived from high-pressure water. The increase in the water content in the added mixture is 120 ÷ (500 + 25 + 120) × 100 = 19%. If the water content in the incinerator ash is 8% or less, the water content in the finally obtained mixture is The rate can be (120 + 500 × 0.08) ÷ (500 + 25 + 120) × 100 = 25% weight or less. Although the water content of incinerator ash is close to zero when it is generated, the water content in incinerator ash is usually much lower than 8% even if it absorbs moisture due to long-term storage and rises over time. is there.

The nozzle can be mounted in a nozzle protection tube (2) having a cross-sectional area larger than the cross-sectional area of the high-speed fluid due to the ejection of high-pressure water. For example, the inner diameter (Dn) of the high-pressure water discharge port of the nozzle can be 0.5 mm to 5 mm, and the high-speed fluid ejection speed can be 30 to 100 m / s. ) Is 5 to 15 mm, and its length (L1) can be 80 to 180 mm. The nozzle protection pipe prevents the mixture to be dropped from the mixture input pipe described below from adhering to the vicinity of the nozzle discharge port, obstructing the ejection of high-pressure fluid, and preventing the ejection from being deflected. , It is provided for the introduction of air by the ejector (suction) effect from the air pipe arranged behind the high-pressure water discharge port. When there are a plurality of nozzles (1), the nozzle protection tube may be provided for each nozzle, or may be provided alone on the outside of the bundle of the plurality of nozzles (1).
In FIG. 1, the spread of the high-speed jet stream from the single nozzle (1) is shown to be substantially equal to the cross-sectional area of the lower end of the tubular mixing pipe. The spread of the jet stream can be increased or decreased. Further, the high-speed jet stream from the nozzle (1) can be a spray stream having a considerably large spread.

Below the nozzle, a tubular mixing tube (4) having an upper end and a lower end, having a constant length, and having a constant cross-sectional area over the constant length is arranged in the substantially vertical direction, and has the tubular shape. At the upper end of the mixing pipe, a mixture charging pipe (5) for charging two or more kinds of mixed products under atmospheric pressure is arranged. The inclination and cross-sectional area of the mixture input pipe depend on the amount of the mixture input, but it is designed so that it does not block. For example, as shown in FIGS. 1 and 2, the angle of the mixture input pipe can be 40 to 60 °. As shown in FIG. 2, for example, a belt conveyor can be installed on the upper part of the mixture charging pipe, and two or more kinds of the mixture can be charged via the hopper.

Mixing of two or more types of mixtures, as well as water derived from high-pressure water, is carried out inside a tubular mixing tube arranged in the vertical direction. The inner diameter and length of the tubular mixing pipe are not particularly limited, but can be, for example, an inner diameter (D2) of 30 to 70 mm and a length (L2) of the tubular mixing pipe of 300 to 700 mm. A collision plate (6) for receiving the mixture flowing down the tubular mixing pipe is arranged below the lower end of the tubular mixing pipe. The distance (L3) from the lower end of the tubular mixing pipe to the collision plate can be, for example, 120 to 180 mm.
Two or more kinds of the mixture to be charged from the mixture input pipe, for example, the incinerator ash and the insolubilizer collide with the high-pressure water ejected from the upper part and are dispersed. At this time, it is further diffused by the air introduced from the air pipe, and the dispersion is promoted. Mixing proceeds while the dispersed mixture and water are falling in the vertical direction due to the weight and the action of the high-speed jet stream while maintaining the dispersed state. This is the lower end of the tubular mixing pipe. Further mixing proceeds when it collides with a collision plate arranged below. By going through these processes, the obtained mixture is a mixture of two or more kinds of mixtures, and these and water are uniformly mixed to a high degree. Since the upper part of the mixture input pipe and the lower part of the tubular mixing pipe are open to the atmosphere, these mixing is performed under atmospheric pressure. Further, from the viewpoint of uniform mixing and prevention of blockage in the tubular mixing pipe due to drift, it is desirable that the center line of the tubular mixing pipe, the discharge port of the high-pressure water nozzle, and the collision plate are arranged concentrically in the vertical direction. ..

The shape of the collision plate is not particularly limited, but it must not interfere with the discharge of the mixture from the tubular mixing pipe. For example, the collision plate may have a form in which a flat disk having a diameter somewhat larger than the inner diameter of the tubular mixing pipe is hung from the vicinity of the tubular mixing pipe by a thin round bar and arranged horizontally. In this case, the collision plate diameter (D3) can be 1 to 3 times the inner diameter (D2) of the tubular mixing pipe. Alternatively, if it is desired to further increase the number of collisions depending on the degree of mixing and the physical properties of the obtained mixture, flat plates having an inclination of about 45 ° with respect to the horizontal may be arranged vertically in the opposite direction. When the supply of the mixture to be mixed into the tubular mixing pipe is started, for example, if the high-speed jet fluid ejected from the high-pressure water nozzle collides with the collision plate radially from the center of the collision plate before the start of operation. Even if the collision plate is flat, the mixture does not stay on the collision plate, which hinders the discharge of the mixture from the tubular mixing pipe (that is, the tubular mixing pipe is blocked). It's not. In this respect, the mixing device of the present embodiment has a low risk of blockage and enables continuous operation.
Further, as shown in FIG. 1, in order to prevent the mixture from scattering and contaminating the surrounding environment from the collision plate, it is preferable to provide an anti-scattering can so as to surround the collision plate.

FIG. 1 shows an example of the mixing device of the present embodiment, and FIG. 2 shows a prototype of the mixing device. Needless to say, the present invention can be modified and changed from such an embodiment.
As described above, in the prototype-based design of the mixing device of the present embodiment, the inner diameter (Dn) of the high-pressure water discharge port of a single nozzle is 0.5 mm to 5 mm, and the high-speed fluid ejection speed is high. The inner diameter (D1) of the nozzle protection tube is 30 to 100 m / s, the inner diameter (D1) of the nozzle protection tube is 5 to 15 mm, the length of the nozzle protection tube (L1) is 80 to 180 mm, and the inner diameter (D2) of the tubular mixing tube is 30 to 70 mm. The length (L2) of the tubular mixing tube is 300 to 700 mm, the distance (L3) from the lower end of the tubular mixing tube to the collision plate is 90 to 180 mm, and the collision plate diameter (D3). Was 30 mm to 210 mm, but it goes without saying that the mixing device according to the present invention is planned to be scaled up and should not be limited to these numerical ranges.

[Example 1]
The prototype shown in FIG. 2 was produced to produce a mixture of incinerator ash 100: insolubilizer 5: water 30. An insolubilizer was added onto the incinerator ash transfer conveyor (white incinerator relative to black incinerator). The apparent density of the incinerator ash was 0.7, the supply amount was 500 kg / hr, and the supply amount of the insolubilizer was 5% by weight of the incinerator ash, that is, 25 kg / hr. The mixture transfer pipe was 50 A, the passing speed was 7 cm / s, the inner diameter of the high-pressure water nozzle was 0.8 mm, the pressure of the high-pressure water was 3 MPa, the supply amount was 120 kg / hr, and the passing speed was 66 m / s. The nozzle protection tube has an 8A length of 130 mm, the tubular mixing tube has a 50A length of 500 mm, the length from the lower end to the collision plate is 150 mm, the collision plate diameter is 60 mm, and the tubular mixing tube has 150 A scattered at the lower end. A prevention pipe was provided. The resulting mixture was a very homogeneous mixture with a water content of 22% by weight.

By using the mixing apparatus according to the present invention, two or more kinds of a mixture, for example, incinerator ash or cinder and a heavy metal insolubilizer can be mixed in a short time while keeping the water content in the obtained mixture extremely low. , Can be mixed uniformly and can be operated stably and continuously. Further, the mixing device according to the present invention is energy-saving and space-saving, and further, the stirrer and the like do not have a mechanical drive portion, and there is no risk of potential mechanical failure. Therefore, the mixing device according to the present invention can be suitably used for detoxifying incinerator ash and cinders.

1 High pressure water nozzle (single case)
2 Nozzle protection pipe 3 Air pipe 4 Cylindrical mixing pipe 5 Mixing material input pipe 6 Collision plate 10 Mixing device Dn Inner diameter of high-pressure water discharge port of nozzle D1 Inner diameter of nozzle protection pipe 2 L1 Length of nozzle protection pipe 2 D2 Cylindrical Inner diameter of mixing pipe 4 L2 Length of tubular mixing pipe 4 L3 Distance from the lower end of the cylindrical mixing pipe 4 to the collision plate 6 (in the case of a horizontal flat plate)

Claims (5)

Single or multiple nozzles for ejecting high pressure water of 0.5 MPa to 5 MPa in the substantially vertical direction; Nozzle protection tube having a cross-sectional area larger than the cross-sectional area of the high-speed jet fluid due to the discharge of high-pressure water from the nozzles; An air pipe arranged on the side surface of the nozzle protection pipe for sucking air by the suction pressure of the high-speed jet fluid; arranged in the substantially vertical direction below the nozzle, having an upper end and a lower end, and having a constant length. A tubular mixing pipe having a constant cross-sectional area over a certain length; a mixed material charging pipe for charging two or more kinds of mixed materials from the upper end of the tubular mixing pipe under atmospheric pressure; In order to uniformly mix two or more kinds of objects to be mixed with each other and water, which are arranged below the lower end of the tubular mixing tube and include a collision plate for receiving the mixture flowing down the tubular mixing tube. The mixing device according to the above, wherein the water content in the obtained mixture is less than 50% by weight. The inner diameter (Dn) of the high-pressure water discharge port of the single nozzle is 0.5 mm to 5 mm, the high-speed fluid ejection speed is 30 to 100 m / s, and the inner diameter (D1) of the nozzle protection pipe is 5 to 5. It is 15 mm, the nozzle protection tube length (L1) is 80 to 180 mm, the inner diameter (D2) of the tubular mixing tube is 30 to 70 mm, and the length (L2) of the tubular mixing tube is 300 to. The mixing device according to claim 1, wherein the mixing device is 700 mm, the distance (L3) from the lower end of the tubular mixing tube to the collision plate is 90 to 180 mm, and the collision plate diameter (D3) is 30 mm to 210 mm. The mixing apparatus according to claim 1 or 2, wherein the two or more kinds of the mixture to be supplied to the mixture input pipe are non-uniformly premixed. Using the mixing apparatus according to any one of claims 1 to 3, a step of uniformly mixing the incinerator ash or cinder and heavy metal insolubilizers as the two or more kinds of mixtures, and water and the incinerator. A method for producing a mixture containing less than 50% by weight of a water content. Claims that the incinerator ash or cinder is charged at a rate of 300 to 700 kg / hr, the heavy metal insolubilizer is charged at a rate of 15 to 35 kg / hr, and the high-pressure water discharged from the nozzle is charged at 120 kg / hr. Item 4. The method according to item 4.

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