JP2000246012A - Solid-liquid separation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently separate fine particles precipitated in a hydrothermal reaction apparatus from a treated soln. SOLUTION: In a solid-liquid separation apparatus, suspended fine particles 12 are separated from the treated soln. from a hydrothermal reaction treatment apparatus. In this case, the hydrothermal reaction treatment apparatus is constituted of a hermetically closed cylindrical easing 1, the spiral pipe 2 provided along the inner wall of the easing 1 and the cylindrical collecting louver 3 provided between the spiral pipe 2 and the casing 1 so as to surround the spiral pipe 2 and having slits 3b turned obliquely downwardly toward the outside formed thereto. The outside of the spiral pipe 2 comprises a perforated plate 2a permitting fine particles to pass and a treated soln. inflow port 4 is connected to the upper end of the spiral pipe 2 and a cleared soln. outlet 5 is connected to the lower end thereof. The lower portion of the casing 1 is formed into a sedimentation chamber 8 having an inverted conical bottom plate and a fine particle discharge port 1d is connected to the lower end of the sedimentation chamber 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation apparatus for preventing inorganic suspended matter from being separated and deposited and clogging after or during processing in a hydrothermal reactor.

[0002]

2. Description of the Related Art Hydrothermal reactors have been developed as devices for reducing the volume of organic waste such as pulp sludge.
A hydrothermal reactor is a device that reacts organic waste with hot water at a temperature of 200 ° C or higher and a pressure of 20 atm or higher. The organic waste is decomposed and solubilized, and inorganic substances or inorganic substances and organic substances are dissolved. The residue of the fine particles of the mixture remains. Since a suspension of these fine particles may deposit on valves, pipes, back pressure valves and the like to cause clogging, it is necessary to remove them from the liquid after or during the treatment in the hydrothermal reactor.

There are sedimentation type and liquid cyclone type separation devices as a device for separating solid and liquid, but a liquid cyclone type solid-liquid separation device is suitable in terms of processing time, required space, separation capacity and the like.

[0004]

However, in the above-mentioned liquid cyclone-type solid-liquid separation device, the particle diameter is several μm or more.
Although it is suitable for 100 μm, there is a problem that the collected fine particles are re-scattered in the separator.
It is very difficult for submicron particles of 1 μm or less and those having a small difference in specific gravity. Further, in the conventional liquid cyclone, since the entire liquid in the cyclone is swirled, extra energy is required, and when the processing flow rate is small, a sufficient flow velocity cannot be obtained and the separation performance deteriorates. In addition,
The temperature and pressure conditions of the hydrothermal reactor vary depending on the material to be treated, and some of those difficult to treat are performed under supercritical temperature and pressure conditions.

The present invention has been devised in view of the above-mentioned problems of the prior art, and saves wasted energy required in a hydrocyclone and separates fine particles containing submicron particles from a processing solution. It is an object of the present invention to provide a solid-liquid separation device capable of performing the above.

[0006]

According to a first aspect of the present invention, there is provided a solid-liquid separation apparatus for separating fine particles suspended in a liquid from a processing liquid processed by a hydrothermal processing apparatus. A solid-liquid separator, comprising a closed cylindrical casing, a spiral pipe provided along the inner wall of the casing, and a spiral pipe surrounding the spiral pipe and provided between the spiral pipe and the casing, and having a downward facing outward. It consists of a cylindrical collection louver with a slit formed, the outside of the spiral tube is a perforated plate through which fine particles can pass, a processing liquid inlet at the upper end of the spiral tube, and a fining liquid outlet at the lower end. The lower part of the casing is a sedimentation chamber having an inverted conical bottom plate, and a fine particle discharge port is connected to the lower end of the sedimentation chamber.

A solid-liquid separation device according to a third aspect of the present invention is a solid-liquid separation device for separating fine particles suspended in a solution from a treatment solution treated by a hydrothermal treatment device, wherein An inverted conical casing, an Archimedes spiral tube provided along the inner wall of the casing, and provided between the Archimedes spiral tube and the casing so as to surround the Archimedes spiral tube and have a downwardly directed slit formed therein. It consists of a truncated inverted conical collecting louver, and the outside of the Archimedes spiral tube is a perforated plate through which fine particles can pass. The lower part of the casing is a sedimentation chamber having an inverted conical bottom plate, and a fine particle discharge port is connected to the lower end of the sedimentation chamber.

In the above two inventions, it is preferable that a horizontal disk-shaped shielding plate is provided above the sedimentation chamber, and a support leg also serving as a rotation preventing plate is attached to the outer periphery of the shielding plate.

Next, the operation of the present invention will be described. The processing solution is
The liquid flows into the spiral pipe in the casing from the upper processing liquid inlet, flows through the spiral pipe, and is discharged from the lower clear liquid outlet. The fine particles suspended in the processing solution are accelerated outward by centrifugal force while the processing solution flows down the spiral tube. Since the outside of the helical tube is a perforated plate through which fine particles can pass, the fine particles fly out through the through holes. Surrounding the spiral tube, there is provided a collecting louver in which an obliquely downwardly directed slit is formed outward, and the fine particles that have flowed out of the spiral tube change their direction obliquely downward by hitting the louver, and on the inner wall of the casing. It descends along the lower settling chamber, gathers at its center and is discharged from the fine particle outlet. The inside of the casing has a gentle swirling flow in the form of wrapping around the flow in the spiral tube, but a horizontal disk-shaped shielding plate is provided at the top of the settling chamber, and the support legs supporting the shielding plate are: The vertical plate is provided on the outer periphery of the shielding plate so as to project obliquely downward in the radial direction, and also serves as a rotation preventing plate. Therefore, the fine particles separated from the processing liquid do not scatter, and are not discharged outside and re-mixed into the clarified liquid. Also, unlike the general cyclone, the entire liquid in the casing is not swirled to create a free vortex, but only the processing liquid in the spiral tube is swirled. Therefore, even if the flow velocity in the tube is increased, there is little waste of energy.

The invention of claim 1 is characterized in that the casing and the helical tube are cylindrical, whereas the invention of claim 3 is that the casing is a truncated inverted cone and the helical tube is an Archimedes helical tube. You. According to the third aspect of the invention, since the spiral tube is an Archimedes spiral tube, the centrifugal force increases as it goes downward, and coarse particles are separated at the upper portion and fine particles are separated at the lower portion. Classification is possible.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a partial plan view of the solid-liquid separation device of the invention described in FIG.
(B) is a sectional view. FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG. In these figures, reference numeral 1 denotes a closed cylindrical casing. The casing 1 includes a cylindrical portion 1a,
A ceiling plate 1b for sealing the upper part of the cylindrical portion 1a;
An inverted conical bottom plate 1c that seals the lower part of the bottom plate, and a fine particle discharge port 1d connected to the lower end of the bottom plate 1c. The settling chamber 8 is formed by the inverted conical bottom plate 1c. Reference numeral 2 denotes a spiral tube provided along the inner wall of the casing 1, and is a perforated plate 2a having a large number of holes through which fine particles can pass in the outer half of the spiral tube 2. The pitch circle radius of the spiral tube 2 is r. At the upper end of the spiral tube 2 is a processing liquid inlet 4.
Is connected, and a clarified liquid outlet 5 is connected to the lower end. Reference numeral 3 denotes a collecting louver which surrounds the helical tube 2 and is provided between the helical tube 2 and the casing 1, and has a number of truncated conical circles so as to form a number of diagonally downwardly directed slits 3a. A large number of rings are provided side by side in the vertical direction. Note that the collection louver 3 may be formed in a spiral shape.

Reference numeral 6 denotes a horizontal disk-shaped shielding plate,
A support leg 7 composed of 4 to 8 vertical plates projecting obliquely downward in the radial direction is provided on the outer periphery of the support leg.
Is fixed to the bottom plate 1c. The support leg 7 also serves as a turning prevention plate. Reference numeral 9 denotes a valve provided at the fine particle discharge port 1d.

Next, the operation of this embodiment will be described. The processing liquid 10 flows into the spiral pipe 2 in the casing 1 from the upper processing liquid inlet 4, flows through the spiral pipe 2, and is discharged from the lower clear liquid outlet 5. The fine particles 12 suspended in the processing liquid 10 are accelerated outward by the centrifugal force while the processing liquid 10 flows down in the spiral tube 2. Since the outer half of the spiral tube 2 is a perforated plate 2a through which fine particles can pass,
The fine particles fly out through the through holes 2b. There is provided a collecting louver 3 surrounding the spiral tube 2 and having a slit 3a directed obliquely downward toward the outside, and the fine particles 12 that have jumped out of the spiral tube 2 hit the louver 3 and are directed obliquely downward. Then, it descends along the inner wall of the casing 1 and enters the lower settling chamber 8, where it is collected at the center thereof and discharged by intermittently opening the valve 9 from the fine particle discharge port 1d. The inside of the casing 1 has a gentle swirling flow in the form of being swirled with the flow in the spiral tube 2, and a horizontal disk-shaped shielding plate 6 is provided above the settling chamber 8. The supporting leg 7 for supporting is a vertical plate provided on the outer periphery of the shielding plate 6 so as to protrude obliquely downward in the radial direction, and also serves as a turning prevention plate. There is no swirling flow inside 8 and it is stationary.
Therefore, the fine particles separated from the processing liquid 10 do not scatter, and are not discharged outside and re-mixed into the fining liquid 11. If the flow velocity in the spiral tube 2 is V, the centrifugal force acting on the fine particles is proportional to V ² / r. As described above, since the processing liquid in the spiral tube 2 is swirled instead of swirling the whole liquid in the casing 1 to create a free vortex, even if the flow velocity is increased, there is little waste of energy.

FIG. 3A is a partial plan view according to the third aspect of the present invention, and FIG. 3B is a sectional view. In the invention of claim 1 shown in FIG. 1, the casing 1, the collecting louver 3, and the spiral tube 2 are cylindrical, whereas the invention shown in FIG.
The present invention is different from the first embodiment in that the casing 21 and the collecting louver 23 have a truncated inverted conical shape, and the spiral tube 22 is an Archimedes spiral tube. In the invention of claim 3, the spiral tube 22
Is an Archimedes spiral tube (the radius of the upper end is R and the radius of the lower end is r), so the centrifugal force increases as going downward, coarse particles are separated in the upper part, and fine particles are separated in the lower part. If provided separately, particles can be classified.

The present invention is not limited to the embodiment described above, and various changes can be made without departing from the gist of the invention.

[0016]

As described above, the solid-liquid separation device of the present invention provides a spiral tube having a porous plate on the outside in a casing, and allows the processing liquid to flow at a high speed in the spiral tube, whereby fine particles are centrifugally separated. Since the fuel is ejected outside the pipe and collected, energy release to an extra area can be suppressed as compared with a general liquid cyclone, thereby saving energy. In addition, fine particles scattered in the separation device are not re-mixed in the clarified liquid, and an excellent effect is obtained such that a high separation efficiency can be obtained up to submicron particles.

[Brief description of the drawings]

FIG. 1A is a partial plan view of the invention according to claim 1;
(B) is a sectional view.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG. 1;

FIG. 3 (A) is a partial plan view of the invention according to claim 3;
(B) is a sectional view.

[Explanation of symbols]

 Reference Signs List 1, 21 Casing 2, 22 Spiral tube 3, 23 Collection louver 4 Processing liquid inlet 5 Refining liquid outlet 6 Shielding plate 7 Rotation preventing plate 8 Sedimentation chamber 10 Processing liquid 11 Refining liquid 12 Fine particles

Continuing from the front page (72) Inventor Satoshi Kawasaki 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Technical Research Institute, Kawashima-Harima Heavy Industries Co., Ltd. Kawashima-Harima Heavy Industries Co., Ltd. (72) Inventor Kenji Suzuki 1 Kawasaki-Harima Heavy Industries Co., Ltd. F-term (reference) 1D, Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa 4D062 BA29 CA05 FA01 FA11

Claims (4)

[Claims] 1. A solid-liquid separation device for separating fine particles suspended in a solution from a treatment solution treated by a hydrothermal reaction treatment device, wherein the solid-liquid separation device is provided along a closed cylindrical casing and an inner wall of the casing. A spiral collecting tube is provided between the spiral tube and the casing so as to surround the spiral tube, and has a cylindrical collecting louver in which an obliquely downwardly directed slit is formed outward. Is a perforated plate that can pass through, a treatment liquid inlet is connected to the upper end of the spiral tube, a clarifying liquid outlet is connected to the lower end, and the lower part of the casing is a sedimentation chamber with an inverted conical bottom plate. And a fine particle discharge port connected to the lower end of the settling chamber. 2. The solid-liquid according to claim 1, wherein a horizontal disk-shaped shielding plate is provided above the sedimentation chamber, and a support leg also serving as a rotation preventing plate is attached to an outer periphery of the shielding plate. Separation device. 3. A solid-liquid separation device for separating fine particles suspended in a liquid from a treatment liquid treated by a hydrothermal reaction treatment device, comprising: a closed truncated inverted conical casing; The provided Archimedes spiral tube, and a trapezoidal inverted conical trapping louver provided between the Archimedes spiral tube and the casing surrounding the Archimedes spiral tube and having a diagonally downwardly directed slit formed outward. The outside of the Archimedes spiral tube is a perforated plate through which fine particles can pass, a processing liquid inlet is connected to the upper end of the Archimedes spiral tube, a clarifying solution outlet is connected to the lower end, and a lower portion of the casing is A solid-liquid separation device comprising a settling chamber having an inverted conical bottom plate, wherein a fine particle discharge port is connected to a lower end of the settling chamber. 4. The solid-liquid separation according to claim 3, wherein a horizontal disk-shaped shielding plate is provided above the sedimentation chamber, and a support leg also serving as a rotation preventing plate is attached to an outer periphery of the shielding plate. apparatus.