JP2017200690A - Centrifugal filtration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal filtration device.SOLUTION: A centrifugal filtration device includes a centrifugal rotary cylinder and a rotary filtration device, where the rotary filtration device is provided in a storage space in a rotatable manner and includes a filtration device body and a filtrate discharge pipe, the filtration device body includes a filtration cylinder and is formed so that a filtrate storage space is surrounded by the filtration cylinder, and the filtrate discharge pipe communicates with the filtrate storage space. A vortex flow is generated by rotation of a raw material liquid through any one rotation of the centrifugal rotary cylinder and the rotary filtration device to form a heavy liquid obtained by shaking off of the raw material liquid by a centrifugal force with the centrifugal rotary cylinder and a light liquid forced toward the filtration cylinder, the light liquid is a filtrate generated in the filtrate storage space through filtration of the filtration cylinder, and the filtrate is discharged from the centrifugal filtration device through the filtrate discharge pipe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a centrifugal filtration device, and more particularly to a centrifugal filtration device in which a centrifugal force is generated by rotation of a centrifugal rotary cylinder or a rotary filter, and a raw material liquid is centrifuged to separate a light liquid and a heavy liquid.

  Centrifugation and filtration technology is widely used in industrial fields such as petrochemistry, metallurgy, chemical industry, biology, food, energy, machinery, electric power, coal, liquor, spinning, pharmaceuticals, and hygiene. The centrifuge equipment used on a daily basis separates solid phase-liquid phase, liquid phase-liquid phase, liquid phase-liquid phase-solid phase, solid phase-liquid phase-liquid phase ("Liquid" A device that broadly refers to a fluid and includes a liquid phase and a gas phase), and is mainly used in the fields of dehydration, clarification, classification, concentration, and separation.

  Generally speaking, centrifugal filtration leaves the suspension through the filter medium by the action of centrifugal force, leaving solid particles on the filter medium, so that the filter cake accumulates and the liquid passes through the cake layer and filter medium filtration. To become a filtrate. Common types of centrifuges / filters of this type include tripod type, flat plate type, upper suspension type, bypass type, peeler, piston pusher, scroll discharge, centrifugal force discharge, vibration discharge, rotary discharge, filter cloth inversion, etc. The detailed structure and principle of these centrifuges or filters are described in Non-Patent Document 1 (ISBN 978-7-122-18787-1, which is incorporated herein by reference in its entirety. You can refer to.

  However, in industrial standards where the particle size of the particles is more stringent, it is often necessary to use relatively large centrifugal forces and relatively high density filter media to separate relatively small particles, and small particles can be filtered very easily. Centrifugation and filtration after clogging the material became difficult, so it was necessary to always stop the operation, wash the filter material and / or replace the filter material. This increased time and wasted money. Therefore, there has been a need for a centrifugal separation facility that can delay scale adhesion and that can separate particles and supernatant liquid with a simple operation.

  Referring to FIG. 1, FIG. 1 is a schematic diagram showing the structure of a prior art centrifuge. As shown in the figure, the centrifugal separator PA100 includes a centrifuge body PA1, a rotary shaft PA2, and a filtration mesh assembly PA3. The rotary shaft PA2 is rotatably provided in the centrifuge main body PA1, and the filtration mesh assembly PA3 is provided. By rotating and fixing the rotation shaft PA2, the rotation shaft PA2 rotates along with the rotation shaft PA2. When the rotary shaft PA2 rotates, the raw material liquid PA300 that has entered the filter mesh assembly PA3 via the inlet PA21 of the rotary shaft PA2 is swirled and flowed to the filter mesh assembly PA3 by generating centrifugal force. Then, filtration is performed, and particles contained in the raw material liquid PA300 are deposited on the filter mesh assembly PA3 to form a filter cake PA200.

  Since the rotation of the rotation shaft PA2 causes the raw material liquid PA300 to swirl and flow, the particles contained in the raw material liquid PA300 naturally move along with the flow direction of the raw material liquid PA300, and thus accumulate on the filtration net assembly PA3, thereby causing the centrifugal separation. After the separator PA100 has been used for a certain period of time, the filtration speed of the centrifugal separator PA100 decreases due to the increase in the thickness of the filter cake PA200, and the user stops the machine operation and removes the filter cake PA200. The filtration rate of the filtration device PA100 can be maintained.

“Industrial Centrifuge and Filter Selection Manual”

  In view of the fact that in the prior art, particles accumulate on the filter medium due to the same direction of filtrate movement as the existing centrifuge particles, so that the filtration rate is reduced or the filter medium needs to be replaced or washed. The main object of the present invention is to use the principle of centrifugal force and mass balance, the centrifugal force moves the particles in the direction of centrifugal force, the mass balance moves the liquid in another direction (filter material), and the filtration The object is to provide a centrifugal filtration device which is fast and stable and does not always need to replace or wash the filter medium (which is not necessary at all).

  Necessary technical means used by the present invention to solve the problems of the prior art provides a centrifugal filtration device used for filtration of a raw material liquid containing a plurality of particles. The centrifugal filtration device includes a centrifugal rotary cylinder and a rotary filter. The centrifugal rotating cylinder includes a storage space, and the storage space is used to store the raw material liquid. The rotary filter is provided in the accommodating space so as to be relatively rotatable, and includes a filter body and a filtrate discharge pipe. The filter body includes a filter cylinder, and is formed so as to surround the filtrate collection space with the filter cylinder. The filtrate discharge pipe is connected to the filter body and communicates with the filtrate collection space. By rotating the raw material liquid through the rotation of either the centrifugal rotary cylinder or the rotary filter to generate a vortex, the raw liquid is shaken off to the centrifugal rotary cylinder by centrifugal force, and A light liquid that approaches the filter cylinder is formed, and the centrifugal force that the particles receive gradually decreases from the heavy liquid toward the light liquid, and the light liquid passes through the filter cylinder and is filtered. The filtrate produced in the collection space, and the filtrate is discharged from the centrifugal filtration device via the filtrate discharge pipe.

  As a subordinate technical means derived from the necessary technical means, the filter body further includes a pedestal and an upper lid, and the pedestal and the upper lid are fixed to both upper and lower ends of the filtration cylinder and surrounded by the filtration cylinder. The filtrate collecting space is formed, and the filtrate discharge pipe is connected to the pedestal.

  As a subordinate technical means derived from the necessary technical means, the rotary filter further includes a raw material liquid input pipe, the raw material liquid input pipe is connected to the filter body, and is rotatably inserted into the centrifugal rotary cylinder. And provided with at least one discharge port, and the discharge port communicates with the storage space, whereby the raw material liquid enters the storage space via the raw material liquid input pipe.

  As a dependent technical means derived from the necessary technical means, the cylindrical body is a filtration cylindrical body.

  As a subordinate technical means derived from the necessary technical means, the filtrate discharge pipe is rotatably provided in the centrifugal rotating cylinder.

  As a dependent technical means derived from the necessary technical means, the centrifugal rotating cylinder includes a lower holder, a cylindrical body, and an upper holder, and the lower holder has at least one liquid outlet communicating with the accommodation space. The particles are discharged from the storage space via the liquid outlet, the cylindrical body is connected to the lower holder, the upper holder is connected to the cylindrical body, the storage space is the lower holder, the It is formed by being surrounded by a cylindrical body and the upper holder.

  As a subordinate technical means derived from the necessary technical means, the centrifugal filtration device further includes a liquid collection tank, and the centrifugal rotating cylinder is rotatably provided in the liquid collection tank and communicates with the accommodating space. One liquid outlet is further opened and the liquid collection tank is used to collect the heavy liquid discharged from the liquid outlet. The liquid collection tank is further provided with an upper liquid collection tank, and the upper holder is provided with at least one overflow opening communicating with the accommodation space. The upper liquid collection tank corresponds to an upper side of the liquid collection tank. Provided.

  As a dependent technical means derived from the necessary technical means, the centrifugal rotating cylinder includes a filtering cylinder, and the filtering cylinder is used for filtering the heavy liquid.

  As a dependent technical means derived from the necessary technical means, the rotary filter further includes a helical scraper provided in the filter cylinder.

  As a dependent technical means derived from the necessary technical means, the rotary filter body further includes a plurality of disks, which are connected to the filter cylinder.

  A method for operating a centrifugal filtration device, which is used to operate the centrifugal filtration device according to claim 1. The operation method includes a step (a) of constructing a transport pipe line and communicating a raw material liquid storage container storing the raw material liquid with the accommodation space of the centrifugal rotating cylinder, and storing the raw material liquid using a pump. A step (b) of feeding and filling the raw material liquid stored in a container into the accommodation space; and driving and rotating any one of the centrifugal rotary cylinder and the rotary filter; A step of rotating the raw material liquid accommodated in the container to generate a vortex to form the heavy liquid and the light liquid, and the filter cylinder filters the light liquid and discharges the filtrate (c) ) And.

  As mentioned above, prior art centrifuges, when separating particles from the raw material liquid by centrifugal force, the particles and liquid move in the same direction of movement, so the particles are deposited on the filter medium that filters the liquid. However, the filtration speed is reduced, or cleaning or replacement is required; however, the present invention provides a filter in the centrifugal rotating cylinder, and when the centrifugal rotating cylinder rotates through the principle of mass balance, Since the liquid is divided into a heavy liquid that moves toward the wall of the centrifugal rotating cylinder and a light liquid that moves toward the filtration cylinder by centrifugal force, it is possible to effectively avoid the accumulation of particles in the filtration path of the liquid, Compared to the prior art, the filtration method in which the direction of movement of the particles and the filtrate of the present invention is reversed can be effectively achieved at a relatively high filtration rate, and the filter material is also effectively attached to the scale. Can be delayed

  Specific examples used in the present invention will be further described with reference to the following examples and drawings.

It is a schematic diagram which shows the structure of the centrifuge of a prior art. It is a schematic diagram which shows the structure of the centrifugal filtration apparatus which concerns on the 1st preferable Example of this invention. It is a schematic diagram which shows the structure of the centrifugal filtration apparatus which concerns on the 2nd preferable Example of this invention. It is a schematic diagram which shows the structure of the centrifugal filtration apparatus which concerns on the 3rd preferable Example of this invention. It is a schematic diagram which shows the structure of the centrifugal filtration apparatus which concerns on the 4th preferable Example of this invention. It is a schematic diagram which shows the structure of the centrifugal filtration apparatus which concerns on the 5th preferable Example of this invention. It is a schematic diagram which shows the system which actually operates the centrifugal filtration apparatus which concerns on the 1st preferable Example of this invention. It is the schematic which shows the data distribution of the time which actually tested the general centrifuge of the prior art, and the centrifugal filtration apparatus of this invention, and the filtration flux.

Example 1
Referring to FIG. 2, FIG. 2 is a schematic diagram showing the structure of the centrifugal filtration device according to the first preferred embodiment of the present invention. As shown in the figure, the centrifugal filtration device 100 is used for filtering a raw material liquid, and the raw material liquid can include a plurality of types of particles (not shown). The centrifugal filtration device 100 includes a centrifugal rotary cylinder 1, a rotary filter 2, and a liquid collection tank 3. The centrifugal rotating cylinder 1 includes a lower holder 11, a cylindrical body 12, and an upper holder 13, and a plurality of liquid outlets 111 (only one is shown in the figure) is opened in the lower holder 11. The upper holder 13 is connected to the cylindrical body 12, and is surrounded by the lower holder 11, the cylindrical body 12, and the upper holder 13 to form the accommodation space S1. Since the storage space S1 is a general centrifuge basket, the shape thereof can be cylindrical, tank-shaped, conical or, for example, the shape of a conventional centrifuge or a cyclone separator. In practice, the material of the lower holder 11, the cylindrical body 12 and the upper holder 13 can be a light and hard material such as acrylic, but is not limited thereto. The cylindrical body 12 is fixed to the upper holder 11 by fastening the lower holder 11 and the upper holder 13 by, for example, a screw tightening method (but not limited to this, and may be tightened by another fixing method). It is fixed between the holders 13 and the liquid outlet 111 is practically provided with a valve to control the discharge flow rate.

  The rotary filter 2 is provided in the housing space S1 so as to be relatively rotatable, and includes a filter main body 21, a filtrate discharge pipe 22, and a raw material liquid input pipe 23. The filter main body 21 includes a filter cylinder 211, a pedestal 212, And an upper lid 213. In practical operation, the filtration cylinder 211 is a cylindrical structure made of a filtration material, but is not limited thereto. The filter cylinder 211 may also be a foldable filter medium or a broad filter medium. The pedestal 212 is attached to the bottom end of the filtration cylinder 211, and the upper lid 213 is attached to the top end of the filtration cylinder 211, so that the upper and lower ends of the filtration cylinder 211 receive pinching and fixing between the pedestal 212 and the upper lid 213, and the filtration cylinder 211 is surrounded by a base 212 and an upper lid 213 to form a filtrate collection space S2.

  The filtrate discharge pipe 22 is rotatably provided in the lower holder 11 of the centrifugal rotary cylinder 1, is connected to the pedestal 212 of the filter body 21, and further communicates with the filtrate collection space S <b> 2. The filtrate discharge pipe 22 and the lower holder 11 can be pivoted through a bearing, so that the filtrate discharge pipe 22 and the lower holder 11 can be rotated relative to each other.

  The raw material liquid input tube 23 is rotatably provided in the upper holder 13 of the centrifugal rotary cylinder 1 and is connected to the upper lid 213 and includes a plurality of discharge ports 231 (only one is shown in the figure). Since the outlet 231 communicates with the storage space S1, the raw material liquid can enter the storage space S1 via the raw material liquid input pipe 23. Between the raw material liquid input tube 23 and the upper holder 13 is pivotally attached through a bearing, the raw material liquid input tube 23 and the upper holder 13 can be relatively rotated.

  The liquid collection tank 3 is fitted outside the centrifugal rotary cylinder 1, and the centrifugal rotary cylinder 1 is rotatably provided in the liquid collection tank 3.

  As described above, in practical operation, the raw material liquid continuously enters the accommodation space S1 from the raw material liquid input pipe 23 via the discharge port 231 and the input amount is slightly larger than the liquid amount filtered by the filter cylinder 211. In this case, the user can generate a vortex by rotating the raw material liquid stored in the storage space S1 through the rotation of the centrifugal rotary cylinder 1 or the rotary filter 2. At this time, the raw material liquid is A heavy liquid shaken off by the centrifugal rotating cylinder 1 by the generation of a centrifugal force and a light liquid approaching the filtration cylinder 211 are formed, and the heavy liquid is a fluid (including particles) that is relatively affected by the centrifugal force. The light liquid is a fluid that has a relatively small influence on the centrifugal force, and the heavy liquid shaken off by the cylindrical body 12 settles downward and enters the liquid collection tank 3 in the form of liquid from the liquid outlet 111 of the lower holder 11. When discharged, a lot of heavy Forming a turbid liquid containing child, liquid outlet 111 can be set to open after the operation has reached a predetermined time. In addition to this, when the flow rate of the raw material liquid entering the storage space S1 is greater than or equal to the flow rate of the filtrate discharged from the filtrate discharge pipe 22, the light liquid is filtered by being brought closer to the filter cylinder 211. A clear filtrate is generated in the filtrate collection space S <b> 2 through the cylinder 211, and the filtrate can be further discharged from the filtrate discharge pipe 22. Naturally, when the flow rate of the raw material liquid entering the storage space S1 is greater than or equal to the sum of the flow rate of the liquid discharged from the liquid outlet 111 and the amount of liquid filtered and discharged by the filter cylinder 211, the light liquid is filtered. By approaching 211, it can be set so that the light liquid passes through the filter cylinder 211 to generate a clear filtrate in the filtrate collection space S 2, and the filtrate is further discharged from the filtrate discharge pipe 22.

  In addition to this, regarding the rotation of the centrifugal rotary cylinder 1 or the rotary filter 2, the rotary filter 2 is connected to the filtrate discharge pipe 22 and the raw material liquid input pipe 23, respectively. The rotary filter 2 can be rotated through connection to the drive motor, or the centrifugal rotary cylinder 1 can be rotated by directly connecting the centrifugal rotary cylinder 1 to the drive motor. The user can control whether or not the centrifugal rotary cylinder 1 or the rotary filter 2 is rotated in the same direction or in the reverse direction according to actual needs. Therefore, the flow velocity of the vortex flow in the raw material liquid storage space S1 can be controlled. Increase the filtration efficiency relatively, the rotation of the rotary filter 2 naturally rotates the filtration cylinder 211, the shear force generated by this rotation is difficult to adhere particles to the surface of the filtration cylinder 211, delay the scale adhesion Thus, the filtration rate can be increased.

<< Example 2 >>
Referring to FIG. 3, FIG. 3 is a schematic diagram showing the structure of a centrifugal filtration device according to a second preferred embodiment of the present invention. As shown in the figure, the centrifugal filtration device 100a is similar to the centrifugal filtration device 100, and the difference is mainly that the centrifugal filtration device 100a further includes a support frame 4a, and the support frame 4a is different from the liquid collection tank 3. Used to support a similar liquid collection tank 3a, and the liquid collection tank 3a further includes a liquid discharge pipe 31a and an upper liquid collection tank 32a, and the liquid collection tank 3a collects the liquid centrifuged by the centrifugal rotating cylinder 1a. In this case, the liquid is led out through the liquid discharge pipe 31a. In addition, the upper liquid collection tank 32a is provided in the upper holder 13a, and a plurality of overflow ports 131a communicating with the accommodation space (not shown) are opened in the upper holder 13a, and the upper liquid collection tank 32a overflows. It is used for collecting the primary light liquid overflowing from the flow port 131a, and further provided with a discharge valve 321a in the upper liquid collection tank 32a, and used for controlling the discharge amount of the primary light liquid.

Example 3
Referring to FIGS. 2 and 4, FIG. 4 is a schematic diagram showing the structure of a centrifugal filtration device according to a third preferred embodiment of the present invention. As shown in the figure, the centrifugal filtration device 100b is similar to the centrifugal filtration device 100, and the difference is that the centrifugal rotating cylinder 1b further includes a spiral scraper 24b, and the outside of the filtration cylinder 211b that the spiral scraper 24b includes. When the filter cylinder 211b rotates with this, the particles accumulated on the inner wall of the cylindrical body 12b are scraped off via the spiral scraper 24b provided on the outer side.

Example 4
Referring to FIGS. 2 and 5, FIG. 5 is a schematic diagram showing the structure of a centrifugal filtration device according to a fourth preferred embodiment of the present invention. As shown in the figure, the centrifugal filtration device 100 c is similar to the centrifugal filtration device 100, and the difference is that there are slightly more filter bodies (not shown) of the rotary filter 2 c than the filter body 21. The disk 214c is integrally formed from the filter cylinder 211c and extends outward and downward, that is, the disk 214c and the filter cylinder 211c are also used as filter media, and the filter body is rotated through this. In this case, the rotation of the disk 214c can accelerate the filtration of the raw material liquid.

Example 5
Referring to FIG. 6, FIG. 6 is a schematic diagram showing the structure of a centrifugal filtration device according to a fifth preferred embodiment of the present invention. As shown in the figure, the centrifugal filtration device 100 d includes a centrifugal rotary cylinder 1 d, a rotary filter 2, and a liquid collection tank 3. The centrifugal filtration device 100d is similar to the centrifugal filtration device 100, and the difference is mainly that the centrifugal filtration device 100d is replaced with the centrifugal rotation tube 1 by the centrifugal rotation tube 1d, and the centrifugal rotation tube 1d is a cylinder with the lower holder 11d. The cylindrical body 12d is fixed between the lower holder 11d and the upper holder 13d, and in this embodiment, the cylindrical body 12d is a filtration cylinder with a filtration function. For practical operation, the cylindrical body 12d may have a structure containing a filtering material or a structure made of a filtering material.

  Subsequently, the raw material liquid enters the accommodation space (not shown) formed by being surrounded by the lower holder 11d, the cylindrical body 12d and the upper holder 13d via the raw material liquid input pipe 23, and then the centrifugal rotating cylinder 1d or When the raw liquid is rotated by the rotation of the rotary filter 2 and the heavy liquid shaken off to the cylindrical body 12d by the centrifugal force and the light liquid approaching the filter cylinder 211 are generated, the light liquid passes through the filter cylinder 211. The heavy liquid shaken off by the cylindrical body 12d can be discharged into the liquid collection tank 3 and contained in the heavy liquid because the cylindrical body 12d is a filtration cylinder with a filtration function. The deposited particles are also deposited on the inner wall of the cylindrical body 12d to form a filter cake FC. In this way, the centrifugal filter device 100d provided as the present embodiment allows the filtrate to pass through the filter cylinder 211 of the rotary filter 2. The amount of filtrate produced can be further increased through the cylindrical body 12d with a filtration function, and the filtration cake FC can be collected effectively, and the time during which the filtration cake is subjected to centrifugal force is compared. Therefore, its solid content is relatively high.

  Referring to FIGS. 2 and 7, FIG. 7 is a schematic diagram showing a system for actually operating the centrifugal filtration device according to the first preferred embodiment of the present invention. As shown in the figure, the operation method of the centrifugal filtration device 100 of the present invention is that a transport line 200 is constructed, and a raw material liquid storage container 300 that stores the raw material liquid is connected to the centrifugal rotary cylinder via the transport line 200. It is possible to communicate with one accommodation space S1. The transport pipeline 200 includes an inlet side 201, an outlet side 202, a first reflux side 203, and a second reflux side 204 that communicate with each other. The inlet side 201 communicates with the bottom of the raw material liquid storage container 300, and the outlet side 202 The first reflux side 203 and the second reflux side 204 communicate with the top of the raw material liquid storage container 300, and communicate with the raw material liquid input pipe 23 of the centrifugal filtration device 100.

  The raw material liquid stored in the raw material liquid storage container 300 is sent to the accommodation space S1 by the pump P and filled. The pump P is provided between the inlet side 201 and the outlet side 202 of the transport pipeline 200 so as to approach the inlet side 201, and further provided with a first reflux valve V1 between the inlet side 201 and the first reflux side 203. Further, a flow rate control valve V2 is further provided between the inlet side 201 and the outlet side 202, a second reflux valve V3 is further provided between the inlet side 201 and the second reflux side 204, and two pressures are provided on both sides of the flow rate control valve V2. A total of P1 and P2 is further provided.

  The raw material liquid is filled in the storage space S1, and either the centrifugal rotary cylinder 1 or the rotary filter 2 is driven to rotate the raw material liquid stored in the storage space S1 to generate a vortex, A light liquid is formed, and the light liquid passes through the filter cylinder 211 and is discharged. The user can further record the filtrate discharge flow rate, and when the liquid outlet 111 is opened and continuously operated, the flow rate of the raw material liquid entering the storage space S1 is controlled to be larger than the sum of the filtrate discharge flow rate and the liquid discharge amount. In the batch operation for closing the liquid outlet 111, the flow rate of the raw material liquid entering the storage space S1 is controlled to be larger than the discharge flow rate of the filtrate.

  When the actual operation is continued, the first recirculation valve V1, the flow control valve V2 and the second recirculation valve V3 are all fully opened; either the centrifugal rotary cylinder 1 or the rotary filter 2 starts to rotate. Then, the user can further adjust the flow rate of the first recirculation valve V1, observe the pressure value of the pressure gauge P1, and cause the pressure of the raw material liquid entering the accommodation space S1 to reach a preset pressure value. Is mainly related to the filtration rate of the centrifugal filtration device 100, and when the pressure increases within a certain pressure control range, the filtration rate of the centrifugal filtration device 100 can be accelerated. In addition to this, after the storage space S1 is filled with the raw material liquid, the user can discharge the air remaining in the storage space S1 through the control of the opening of the second reflux valve V3.

  Referring to FIG. 8, FIG. 8 is a schematic diagram showing data distribution of time and filtration flux for actually testing a general centrifugal separator of the prior art and the centrifugal filtration device of the present invention. As shown in the figure, for a general filter of the prior art and the centrifugal filtration device of the present invention (for example, the centrifugal filtration device 100 according to the first preferred embodiment), the filter medium and the raw material liquid (0.3 wt%) , Containing 37 to 44 micrometer silicon carbide particles), the experiment and test for about an hour can be performed to obtain the data distribution shown in FIG. The data distribution of the filtration flux obtained after a test using a general filter is shown, and the curve C2 was obtained after the test using the centrifugal filtration device of the present invention. The data distribution of the filtration flux is shown; curve C1 shows the data distribution of the filtration flux obtained by conducting a filtration test with clean water.

  Subsequently, after performing a filtration test of clean water for 1 hour, the curve C1 shows that the filtration flux is about 200 LPH (L / m2-hr-bar), and this filter medium was used. Maximum flow rate. After conducting a filtration test of the raw material liquid for 1 hour with a general filter of the prior art, it can be seen from curve C3 that the filtration flow rate drops to about 75 LPH, because the particles start to accumulate on the filter medium. In comparison with this, after performing the filtration test of the raw material liquid for 1 hour with the centrifugal filtration device 100 of the present invention, it can be seen from the curve C2 that the filtration flow rate is about 150 LPH. Under the same operating conditions as the filter medium, the filtration rate of the centrifugal filtration device of the present invention is about twice the filtration rate of a general filter. In addition to this, when the operation time is further increased, the general filter of the prior art needs to be stopped and removed by increasing the thickness of the filter cake. However, the filtration of the centrifugal filtration device of the present invention not only greatly reduces the influence of the filter cake, but can be operated continuously without the need to stop the operation of the equipment through the discharge of the filter cake.

  To summarize the above, the prior art centrifuge separates impurities such as particles from the raw material liquid by centrifugal force, but basically the particles are deposited on the centrifugal filter medium because the movement directions of the particles and liquid coincide. Therefore, the filtration speed is reduced, or cleaning or replacement is necessary; however, the present invention can provide the filter in the centrifugal rotating cylinder, and further rotate the filtering machine. A centrifugal force is generated to move a heavy liquid (containing particles) toward the wall of the centrifugal rotating cylinder, and a light liquid (containing almost no particles) through an operation in which the input amount is greater than or equal to the discharge amount. In the reverse direction, that is, moving toward the filter cylinder, the filtrate is discharged into the filtrate collection space by filtration of the filter cylinder, and the filtrate is discharged from the centrifugal filtration device via the filtrate discharge pipe. The main technical Compared with conventional filtration technology, the filtration method is not dead end filtration (filter cake filtration), no sweep filtration, and the movement direction of particles and filtrate is reversed. It is possible to satisfy the demand for delaying the scale deposition of the filter medium.

  In addition, since the present invention provides the rotary filter in the centrifugal rotary cylinder, when a vortex is generated in accordance with the rotation of the centrifugal rotary cylinder or the rotary filter, relatively large and relatively heavy particles are centrifuged. It moves toward the inner wall of the centrifugal rotating cylinder due to the force, and the raw material liquid can be filtered effectively and continuously with the rotary filter without clogging the surface of the rotary filter, increasing the usage time. It is not necessary to always wash or replace the filter cylinder of the rotary filter, and by effectively maintaining the maximum filtration rate, the present invention can be used not only for batch operation but also for continuous operation. .

  Next, since the present invention further provides a liquid collection tank, it is possible to collect a liquid containing a large amount of particles discharged from the liquid outlet, and by further providing an upper liquid collection tank, the raw material liquid can be classified and filtered.

  In addition to this, when filtration is performed with a conventional centrifugal separator, the particles are easily deposited on the filter medium, thereby reducing the filtration rate. However, when centrifugal filtration is performed with the centrifugal filtration device of the present invention, as can be seen from the above, the most perfect situation is that the centrifugal force is sufficiently large, and all the particles are cylinders of a centrifugal rotating cylinder. However, if the centrifugal force is insufficient, a small number of particles will also accumulate on the filter body, at which time the filtration rate will also slowly decrease, which will allow the user to By providing a flow rate sensor at the filtrate outlet, the flow rate of the raw material liquid can be relatively reduced as the filtrate flow rate decreases. For example, taking the curve C2 in FIG. 8 as an example, when operating up to 2000 seconds, the filtration rate is about 200 LPH, and when operating up to 3000 seconds, the filtration rate is about 170 LPH, and when it has decreased by 30 LPH, The input amount can be reduced by 30 LPH.

  In practical operation, the present invention can be applied to a process such as cutting and polishing of a wafer. Since the main constituent element of the wafer is Si, SiC is often used as an abrasive grain, and PEG (polyethylene glycol) or the like is used. In order to reduce costs by using organic solvent, usually organic solvent is recovered, so when PEG containing SiC and Si enters the centrifugal filtration device of the present invention, the heaviest SiC particles are cylinders by centrifugal force It is discharged from the liquid outlet sprinkled on the inner wall of the body, then the heavy Si particles are discharged from the overflow port, and the lightest organic solvent PEG is filtered through the filter cylinder to obtain a clear filtrate in the filtrate collection space. And effectively recovering organic solvents can significantly reduce costs; a spiral scraper is installed on the rotary filter to avoid the deposition of SiC particles on the inner wall of the cylinder. In Rukoto it can be discharged by scraping the SiC particles deposited on the inner wall of the cylinder by the helical scraper.

  Although the above is intended for liquid filtration, those skilled in the art can easily apply the technique disclosed above to gas filtration.

  The preferred specific embodiments made in the section of the detailed description of the invention are merely to clarify the technical contents of the present invention, and should not be construed in a narrow sense by limiting to such specific examples. It should be understood that various modifications and changes can be made without departing from the spirit of the present invention as included in the appended claims.

PA100 Centrifuge PA1 Centrifuge body PA2 Rotating shaft PA21 Input port PA3 Filtration network assembly PA200 Filtration cake PA300 Raw material liquid 100 Centrifugal filtration device 1 Centrifugal cylinder 11 Lower holder 111 Liquid outlet 12 Cylindrical body 13 Upper holder 2 Rotary filter 21 Filtration Machine body 211 Filtration cylinder 212 Base 213 Upper lid 22 Filtrate discharge pipe 23 Raw material liquid input pipe 231 Discharge port 3 Liquid collection tank S1 Storage space S2 Filtrate collection space 100a Centrifugal filtration device 1a Centrifugal rotation cylinder 13a Upper holder 131a Overflow port 3a Liquid collection Tank 31a Liquid discharge pipe 32a Upper liquid collection tank 321a Discharge valve 4a Support frame 100b Centrifugal filtration device 1b Centrifugal rotation cylinder 211b Filtration cylinder 24b Spiral scraper 100c Centrifugal filtration apparatus 2c Rotary filtration machine 211c Filtration Cylinder 214c Disc 100d Centrifugal filtration device 1d Centrifugal cylinder 11d Lower holder 12d Cylindrical body 13d Upper holder 200 Transport pipeline 201 Inlet side 202 Outlet side 203 First reflux side 204 Second reflux side 300 Raw material liquid storage container C1, C2, C3 Curve FC Filter cake P Pump P1, P2 Pressure gauge V1 1st recirculation valve V2 Flow control valve V3 2nd recirculation valve

Claims (10)

A centrifugal filtration device used for filtration of a raw material liquid containing a plurality of particles, the centrifugal filtration device,
A centrifugal rotating cylinder having a storage space for storing the raw material liquid;
A filter body, a filter body formed so as to surround the filtrate collection space with the filter cylinder, and a filtrate discharge pipe connected to the filter body and communicating with the filtrate collection space. And a rotary filter provided in a relatively rotatable manner,
Using the centrifugal force and mass balance method, the raw material liquid is generated by the centrifugal force by rotating the raw material liquid through the rotation of either the centrifugal rotating cylinder or the rotary filter to generate a vortex. A heavy liquid that is spun off into the centrifugal rotating cylinder is formed, and a mass balance moves the liquid toward the filtration cylinder to become a light liquid approaching the filtration cylinder, and the weight of the particles from the heavy liquid Gradually decreasing toward the light liquid, and the light liquid is a filtrate generated in the filtrate collection space through the filtration of the filter cylinder, and the filtrate is discharged from the centrifugal filtration device via the filtrate discharge pipe. A centrifugal filtration device characterized by that.   The filter body further includes a pedestal and an upper lid, and the pedestal and the upper lid are fixed to both upper and lower ends of the filtration cylinder, are surrounded by the filtration cylinder to form the filtrate collection space, and the filtrate discharge The centrifugal filtration device according to claim 1, wherein a tube is connected to the pedestal.   The rotary filter further includes a raw material liquid input pipe, the raw material liquid input pipe is connected to the filter main body, is rotatably provided in the centrifugal rotating cylinder, and includes at least one discharge port, The centrifugal filtration device according to claim 1, wherein the raw material liquid is allowed to enter the storage space via the raw material liquid input pipe when the discharge port communicates with the storage space.   The centrifugal filtration device according to claim 1, wherein the filtrate discharge pipe is rotatably provided in the centrifugal rotating cylinder.   The centrifugal rotating cylinder includes a lower holder, a cylindrical body, and an upper holder. The lower holder has at least one liquid outlet communicating with the accommodation space, and the heavy liquid passes through the liquid outlet. Ejected from the receiving space, the cylindrical body is connected to the lower holder, the upper holder is connected to the cylindrical body, and the receiving space is surrounded by the lower holder, the cylindrical body, and the upper holder. The centrifugal filtration device according to claim 1.   A liquid collection tank, wherein the centrifugal rotating cylinder is rotatably provided in the liquid collection tank, and at least one liquid outlet communicating with the accommodating space is further provided, the liquid collection tank being the liquid outlet The centrifugal filtration apparatus according to claim 1, wherein the centrifugal filtration apparatus is used for collecting the heavy liquid discharged from the tank.   The centrifugal filtration apparatus according to claim 1, wherein the centrifugal rotating cylinder includes a filtration cylinder, and the filtration cylinder is used to filter the heavy liquid.   The centrifugal filter device according to claim 1, wherein the rotary filter further includes a spiral scraper provided in the filter cylinder.   The centrifugal filter device according to claim 1, wherein the rotary filter body further includes a plurality of disks, and the disks are connected to the filter cylinder. A method for operating a centrifugal filtration device, which is used for operating the centrifugal filtration device according to claim 1, wherein the operation method comprises:
(A) constructing a transport pipeline and communicating a raw material liquid storage container storing the raw material liquid with the accommodation space of the centrifugal rotating cylinder;
(B) filling and filling the raw material liquid stored in the raw material liquid storage container into the accommodation space using a pump;
The heavy liquid and the light liquid are generated by driving and rotating one of the centrifugal rotary cylinder and the rotary filter, and rotating the raw material liquid stored in the storage space to generate a vortex. And (c) the filter cylinder filters the light liquid and discharges the filtrate;
The operation method of the centrifugal filtration apparatus characterized by including.

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