TW201701954A - Centrifugal filtration device comprising a centrifugal rotary drum and a filter drum - Google Patents

Abstract

Disclosed is a centrifugal filtration device, comprising a centrifugal rotary drum and a filter drum. The centrifugal rotary drum is configured to contain a solution and be capable of rotating about a central rotation axial line. The filter drum is disposed adjacent to the central rotation axial line in the centrifuge rotary drum for filtering particles in the solution. During a filtration operation, the solution is supplied to the centrifugal rotary drum and the centrifugal rotary drum is rotated. The solution in the centrifugal rotary drum is separated into a first portion of the solution and a second portion of the solution,. The first portion of the solution moves radially away from the central rotation axial line and flows out of the centrifugal rotary drum, and the second portion of the solution moves radially toward the central rotation axial line and flows out of the filter drum through a filter material of the filter drum, wherein a flow rate of the solution supplied to the centrifugal rotary drum is greater than the sum of a flow rate of the solution flowing out of the centrifugal rotary drum and a flow rate of the solution flowing out of the filtering drum.

Description

Centrifugal filtration equipment

The present invention relates to a centrifugal filtration apparatus, particularly a centrifugal filtration apparatus that filters a solution by a filter cartridge disposed at an adjacent portion of a central rotational axis of the centrifuge bowl.

Centrifugal and filtration technologies are widely used in petrochemical, metallurgical, chemical, biological, food, energy, machinery, electric power, coal, alcohol, textile, pharmaceutical, health and other industrial fields. Commonly used centrifugal equipment is a device for separating solid-liquid, liquid-liquid, liquid-liquid-solid, solid-liquid-liquid phase ("liquid" is broadly referred to herein as a fluid, which includes a liquid phase and a gas phase). Its application fields mainly include dehydration, clarification, classification, concentration and separation.

Different centrifuges/filters can be selected depending on the needs of the application. In general, the centrifugal filtration is such that the suspension solution passes through the filter material under the action of centrifugal force, so that the solid particles are trapped on the filter material, and continuously accumulates into a filter cake, and the liquid is filtered through the filter cake layer and the filter material to form a filtrate. Such common centrifugal/filters are three-legged, flat-plate, over-suspended, side-filtering, scraper unloading, piston pushing, screw unloading, centrifugal force unloading, vibration unloading, and advancement. For the details of the structure and principle of these centrifuges or filters, please refer to the book "Industrial Centrifuge and Filter Selection Manual" (ISBN 978-7-122-18787-1, full text) This is incorporated herein by reference.

However, in the industrial standards where the particle size is relatively severe, in order to separate smaller particles, a large centrifugal force and a dense filter material are often required, and small particles are extremely easy to block the filter material, which causes difficulty in subsequent centrifugal separation and filtration. Therefore, it is necessary to frequently suspend operations to clean the filter media and/or replace the filter media, which adds time and cost. Therefore, there is a need for a centrifugal separation apparatus capable of slowing down fouling, simple operation, and capable of separating particles and clear liquid.

In a first aspect of the invention, the centrifugal filtration apparatus comprises a centrifuge drum and a filter cartridge. The centrifuge drum is constructed to contain a solution and is rotatable about a central axis of rotation by a drive. A filter cartridge is disposed adjacent to a central axis of rotation in the centrifuge bowl, the filter cartridge being provided with a filter material for filtering particles in the solution. During the filtration operation, the solution is supplied to the centrifuge drum and the centrifuge drum is rotated. The solution in the centrifuge drum is separated into a first portion of the solution and a second portion of the solution. The first portion of the solution moves radially away from the central axis of rotation and flows out of the centrifuge. The drum, and the second portion of the solution moves radially toward the central axis of rotation and exits the filter cartridge through the filter material of the filter cartridge. The flow rate of the solution supplied to the centrifuge drum is greater than the sum of the flow rate of the solution flowing out of the centrifugal drum and the flow rate of the solution flowing out of the filter drum.

In a second aspect of the invention, the centrifugal filtration device according to the first aspect The device is configured such that the filter cartridge is constructed to be rotatable.

In a third aspect of the invention, the centrifugal filtration apparatus according to the second aspect is configured to cause the rotation direction of the filter cartridge to be the same as the rotation direction of the centrifugal drum.

In a fourth aspect of the invention, the centrifugal filtration apparatus according to the second aspect is configured to cause the rotation direction of the filter cartridge to be opposite to the rotation direction of the centrifugal drum.

In a fifth aspect of the invention, the centrifugal filtration apparatus according to the first aspect or the second aspect is configured to cause the centrifugal drum to be provided with an unfiltered liquid discharge port for discharging the first portion of the solution, and the filter cartridge is provided with the filtrate The discharge port is for the filtered second portion of the solution to flow out.

In a sixth aspect of the invention, the centrifugal filtration apparatus according to the fifth aspect is configured to cause the first partial solution to include the first heavy phase solution and the second heavy phase solution, the first heavy phase solution and the second heavy phase solution diameter The first heavy phase solution is distributed to the ground away from the central axis of rotation.

In a seventh aspect of the invention, the centrifugal filtration apparatus according to the sixth aspect is configured to cause the unfiltered liquid discharge port to include the first unfiltered liquid discharge port and the second unfiltered liquid discharge port, the first unfiltered liquid discharge port The outlet and the second unfiltered liquid discharge port are constructed to be radially distributed for the respective first heavy phase solution and the second heavy phase solution to flow out.

In an eighth aspect of the invention, the centrifugal filtration apparatus according to the first aspect or the second aspect is configured to cause a solution separation member to be provided in the centrifugal drum to assist in the separation of the solution.

In a ninth aspect of the invention, according to the first aspect or the second aspect The centrifugal filtration apparatus is configured to cause a filter cartridge cleaning member to be provided in the centrifuge bowl for removing particles deposited on the filter material of the filter cartridge.

In a tenth aspect of the invention, the centrifugal filtration apparatus according to the first aspect or the second aspect is configured to cause the solution to be supplied into the centrifugal drum in one of a continuous mode and a batch mode.

One advantage of the present invention is that since the second solution moving toward the filter cartridge is a solution (light phase solution) with a relatively small amount of particles, the filtrate is more likely to become a clear liquid.

Another advantage of the present invention is that a small amount of particles make the filter material less prone to blockage, thereby reducing the frequency of cleaning or replacement of the filter material, and also contributing to maintaining a maximum filtration rate for a long period of time.

Yet another advantage of the present invention is that the action of the centrifugal force enables the heavy phase solution to be fractionated so that the solution can be further separated into a clear liquid and several heavy phase solutions.

Other objects, features, and advantages of the centrifugal filtration apparatus disclosed herein will become apparent to those skilled in the art from the following description of the accompanying drawings.

100‧‧‧ centrifugal filtration equipment

110‧‧‧ solution feed tube

111‧‧‧ pressure gauge

112‧‧‧Control valve

113‧‧‧ Feed hole

120‧‧‧Development tube

130‧‧‧Unfiltered discharge pipe

140‧‧‧ filtrate collection container

200‧‧‧Frame

300‧‧‧Motor

400‧‧‧Control panel

500‧‧‧ Centrifugal filter support base

600‧‧‧ Centrifugal filter body

610‧‧‧ Centrifugal drum

611‧‧‧ Centrifugal drum upper housing

612‧‧‧ Centrifugal drum lower housing

612a‧‧‧Unfiltered liquid outlet

613‧‧‧Cylinder

614‧‧‧fixed screw

615‧‧‧Mechanical shaft seal

616‧‧‧ mechanical shaft seal

620‧‧‧Filter cartridge

621‧‧‧Filter materials

622‧‧‧Development of filtrate

630‧‧‧ solution centrifuge chamber

700‧‧‧Unfiltered liquid receiving tank

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood from the following detailed description, in which: FIG. 1 is a schematic cross-sectional view of a centrifugal filter apparatus according to an embodiment of the present invention; FIG. 2 shows FIG. a detailed sectional view of the centrifugal filter body illustrated in the drawing; Figure 3 is a schematic illustration of the operation of a centrifugal filter body in accordance with the present invention; and Figure 4 is a cross-sectional view of a prior art water cyclone.

Embodiments of the present invention will now be described with reference to the accompanying drawings.

Referring first to Figure 1, a centrifugal filtration apparatus 100 in accordance with an embodiment of the present invention is supported by a frame 200. The frame 200 has a motor 300 as a driving device. A control panel 400 is disposed on the outside of the frame 200 to operate the motor 300 and display associated operational parameters of the device.

A centrifugal filter support base 500 is further disposed above the frame 200, and the centrifugal filter support base 500 protects and supports the centrifugal filter main body 600 therein. The outer periphery of the centrifugal filter main body 600 is covered with an unfiltered liquid receiving tank 700 for receiving an unfiltered solution leaving the centrifugal filter main body 600. The centrifugal filter body 600 is coupled to the motor 300 below.

The centrifugal filter device 100 is provided with a solution feed pipe 110, a filtrate discharge pipe 120, and an unfiltered liquid discharge pipe 130 for the solution to be filtered to flow into and out of the centrifugal filtration system. The solution feed pipe 110 is connected to the centrifugal filter main body 600, whereby the solution to be filtered enters the inside of the filter main body 600. A pressure gauge 111, a control valve 112, and a pump (not shown) are disposed on the line of the solution feed pipe 110 to appropriately control the flow rate and flow rate of the solution. A filtrate collection container 140 is disposed under the motor 300 to collect the filtrate leaving the centrifugal filter main body 600, and the filtrate discharge tube 120 provides filtered dissolution. The liquid flows out and the unfiltered discharge tube 130 provides an unfiltered solution to flow out.

The detailed structure of the centrifugal filter body 600 is as shown in FIG. The centrifugal filter body 600 includes a centrifuge bowl 610, a filter cartridge 620, and a solution centrifuge chamber 630 between the centrifuge bowl 610 and the filter cartridge 620.

The centrifuge bowl 610 is composed of a centrifugal drum upper casing 611, a centrifugal drum lower casing 612, and a cylinder 613 to form a closed space for containing the solution to be treated. The cylinder 613 is mounted at the corresponding groove on the centrifugal drum upper casing 611 and the centrifugal drum lower casing 612, and is locked by a fixing screw 614. Therefore, the cylinder 613 forms the side wall of the centrifugal drum 610. The centrifuge bowl 610 may be constructed of other structures as long as it is a closed space capable of providing a suitable centrifugal separation. In this configuration, the centrifugal drum 610 is rotated by the motor 300 to rotate about the central rotation axis, and the filter cartridge 620 is fixed.

The filter cartridge 620 is disposed adjacent to a central axis of rotation in the centrifuge bowl 610. Preferably, the filter cartridge 620 is substantially located on a central axis of rotation. The filter material 621 is fixed around the filter cartridge 620 such that the solution is filtered as it flows through the filter material 621 and enters the filter cartridge 620, and then flows out through the filtrate discharge port 622 below it. The choice of filter material 621 can be determined based on the size of the particles to be filtered and other properties. In order to prevent the solution from leaking out of the centrifugal drum 610, the solution feed pipe 110 and the filtrate discharge port 622 connecting the filter cartridge 620 are provided with a mechanical shaft seal 615 and a mechanical shaft seal 616 at the junction with the centrifugal drum 610.

The solution feed tube 110 is provided with a plurality of sections in the centrifuge drum 610. A plurality of feed holes 113, the solution enters the solution transfer chamber 630 through the feed holes 113.

The unfiltered liquid discharge port 612a is disposed on the lower centrifuge casing 612, and the unfiltered solution leaving the unfiltered liquid discharge port 612a is then taken up by the unfiltered liquid receiving tank 700 and discharged from the unfiltered liquid discharge pipe 130. Due to the gravity factor, the unfiltered liquid discharge port 612a and the unfiltered liquid discharge pipe 130 are preferably disposed at the bottom of the respective containers for the solution to be discharged.

Referring now to Figure 3, during operation of the centrifugal filtration apparatus 100, the solution enters the centrifugal filter body 600 from the solution feed tube 110. By the driving of the motor 300, the centrifugal drum 610 can be rotated at a high speed, causing the fluid in the solution centrifuge chamber 630 to generate centrifugal force. Due to the centrifugal force, the solution initially moves radially outwardly away from the central axis of rotation of the centrifugal drum 610 away from the central axis of rotation. At this time, the particles in the solution mainly gather near the side wall of the centrifugal drum 610.

At this time, as long as the flow rate of the solution flowing into the centrifugal filtration system is slightly larger than the flow rate of the solution flowing out of the centrifugal filtration system, according to the principle of mass balance (that is, F _in = F _out + F _f ), this is slightly larger. The feed flow rate causes the solution in the centrifuge drum to be split into a first portion of the solution and a second portion of the solution. Due to the centrifugal force, the first part of the solution is a solution with a large amount of particles (ie, a heavy phase solution, as indicated by the triangular symbol in FIG. 3), and the second part of the solution is a solution with only a small amount of particles (ie, a light phase). The solution, as indicated by the circular symbol in Figure 3). The light phase solution moves radially inward toward the central axis of rotation toward the direction of the filter cartridge 620. The light phase solution passes through the filter material 621, flows from the inside of the filter cartridge 620 through the filtrate discharge port 622 to the filtrate collection container 140, and is discharged from the filtrate discharge pipe 120 ( _Ff ). At this time, the heavy phase solution is moved radially outward from the side wall of the centrifugal drum 610 away from the central rotation axis (as indicated by the solid arrow), and then discharged from the unfiltered liquid discharge port 612a at the bottom of the centrifugal drum 610 ( _Fout ). The solution entering the centrifugal filter body 600 can be supplied in a continuous or batch manner.

It can be seen that the filter cartridge only filters the solution with a small amount of particles, so that the clear liquid can be obtained more efficiently and the service life of the filter material can be prolonged.

In one case, the filter cartridge 620 can be further rotated by the motor 300 or other motor. With a suitable transmission configuration, the direction of rotation of the filter cartridge 620 can be in the same direction or in the opposite direction as the centrifuge drum 610, and the rotational speeds of the filter cartridge 620 and the centrifugal drum 610 can be adjusted separately. Therefore, when the filter cartridge 620 is rotated, the particles are less likely to accumulate on the surface of the filter material 621, and the maintenance of the filtration speed and the non-fouling of the filter material are more ensured.

Alternatively, a spiral scraper (not shown) may be provided outside the filter cartridge 620 as a filter cartridge cleaning member. The relative rotation and contact between the spiral scraper and the filter cartridge 620 can effectively reduce the accumulation of solid phase particles on the surrounding surface of the filter cartridge 620.

Further, a plurality of unfiltered liquid discharge ports 612a (not shown) may be disposed at the bottom of the centrifugal drum along the side wall of the centrifugal drum 610 in the radial direction of the central rotation axis. In the case of a solution containing particles of different weights, the centrifugal force acts to distribute the different weights of particles in the first portion of the solution in the radial direction, and separately from the unfiltered liquid discharge ports 612a at different radial positions. discharge. Here, the first partial solution includes the first heavy phase The solution and the second heavy phase solution, the weight of the particles in the first heavy phase solution is greater than the weight of the particles in the second heavy phase solution. The first heavy phase solution and the second heavy phase solution are radially distributed such that the first heavy phase solution is closer to the central axis of rotation than the second heavy phase solution. The first heavy phase solution flows out of the unfiltered liquid discharge port 612a (i.e., the first unfiltered liquid discharge port) closer to the side wall of the centrifugal drum 610, and the second heavy phase solution is brought closer to the side wall of the centrifugal drum 610. The unfiltered liquid discharge port 612a (that is, the second unfiltered liquid discharge port) flows out.

For example, in the wafer cutting and polishing process, the material of the wafer is Si, and it is often necessary to use SiC as the abrasive particles and use an organic solvent such as PEG. When the solution produced by the above procedure is to be recovered, the centrifugal filtration apparatus according to the present invention can discharge the heaviest SiC phase and the secondary Si phase from the unfiltered liquid discharge port 612a at different radial positions, respectively, and The lightest organic solvent phase flows through the filter material 621 of the filter cartridge 620 to provide a clear organic solvent.

Alternatively, the centrifugal filtration apparatus 100 can have a solution separation member (not shown) in the centrifuge bowl 610 to assist in the separation of the solution. The solution separating member may be constructed as an overflow portion outside the filter portion 50 of the water cyclone 1 of the water cyclone 1 as shown in the prior art shown in Fig. 4 (Taiwan Patent No. M414266, which is incorporated herein by reference in its entirety) A separation cylinder of 30 is disposed adjacent the outer side of the filter cartridge 620 to concentrate the solution of the lighter phase toward the filter cartridge 620. Alternatively, the solution separation member can be configured to image a plurality of discrete discs that are radially downwardly inclined outwardly in a conventional centrifugal filter to concentrate the lighter phase solution toward the filter cartridge 620.

Moreover, such a solution separation member can be further made as described above. The filtrate is separated into a first heavy phase solution and a second heavy phase solution, and the heavy phase solutions can be separately discharged in combination with a plurality of unfiltered liquid discharge ports.

In the context of the present invention, the terms "heavy phase solution" and "light phase solution" as used herein are used to determine the different effects of the particles contained in the centrifugal force due to their respective weights and/or sizes. Comparative terms. That is to say, the terms "heavy phase", "light phase", "heaviest weight" and "secondary weight" are intended to classify particles of different weights according to the position of the central axis of rotation when subjected to centrifugal force, rather than defining particles. The specific range of weights.

As used herein, the term "comprises" and its derivatives (eg, "including", "having", etc.) as used herein is intended to be an open-ended term that defines the stated features, elements, The existence of components, groups, and/or steps, but does not exclude other unrepresented persons. Also, the elements may be used in a single quantity or in a single element, unless otherwise stated.

As used herein, the directional terms "radial", "outward", "inward", "outside", etc., as used herein are determined based on the central axis of rotation. Therefore, the vertical centrifugal filter device of the embodiment can appropriately change the angle of the central rotation axis to be, for example, a horizontal centrifugal filter device, and in this case, the same technical description is also applicable.

Also, it will be understood that although the terms "first" and "second" are used herein to describe various components, these components should not be limited by the order of the numbering. These numbered terms are only used to distinguish one element from another. In addition, as used here, "substantially" and "large" The terms "about" and "probably" mean the reasonable variation of the modified term so that the final result does not change significantly.

Although the present invention has been described only with respect to the above-described embodiments, it will be apparent to those skilled in the art of the present invention that the present invention is disclosed herein without departing from the scope of the invention as defined by the appended claims. Various changes, modifications or replacements are possible. For example, the dimensions, shapes, locations or orientations of the various components can be varied as desired and/or as desired, unless specifically stated otherwise, as such changes do not materially affect their intended operation or function. Unless explicitly stated otherwise, components that are shown as being directly connected or in contact with each other can have intermediate components disposed therebetween as long as such changes do not substantially affect their intended function. A single component that is shown as being integrally formed may be a single component or be composed of several subcomponents. The function of one element can be performed in two or more quantities, and vice versa, unless otherwise specifically limited. The structure and function of one embodiment may be employed in another embodiment, and all of the features and advantages are not necessarily present in a particular embodiment. A single technical feature that differs from the prior art can be applied alone or in combination with other technical features that are different from the prior art, and should also be considered as further description of further invention. Therefore, the scope of the invention as claimed in the present application is defined by the scope of the claims and the equivalents thereof, and the foregoing description is for illustrative purposes only and not limitation.

110‧‧‧ solution feed tube

113‧‧‧ Feed hole

612a‧‧‧Unfiltered liquid outlet

620‧‧‧Filter cartridge

622‧‧‧Development of filtrate

Claims (10)

A centrifugal filtration apparatus comprising: a centrifugal drum constructed to contain a solution and rotatable about a central axis of rotation by a driving device; and a filter cartridge disposed adjacent to the central axis of rotation in the centrifugation drum In the region, the filter cartridge is provided with a filter material for filtering particles in the solution, wherein during the filtering operation, the solution is supplied into the centrifugal drum and the centrifugal drum rotates, and the solution in the centrifugal drum is separated into a first portion of the solution and a second portion of the solution, the first portion of the solution moves radially away from the central axis of rotation and exits the centrifuge bowl, and the second portion of the solution moves radially toward the central axis of rotation and passes through the filter cartridge The filter material flows out of the filter cartridge, wherein the flow rate of the solution supplied to the centrifugal drum is greater than the sum of the flow rate of the solution flowing out of the centrifugal drum and the flow rate of the solution flowing out of the filter drum. The centrifugal filter device of claim 1, wherein the filter cartridge is constructed to be rotatable by the drive device. The centrifugal filter device of claim 2, wherein the filter cartridge rotates in the same direction as the centrifugal drum. The centrifugal filter device of claim 2, wherein the filter cartridge rotates in a direction opposite to a direction of rotation of the centrifugal drum. The centrifugal filter device of claim 1 or 2, wherein the centrifugal drum is provided with an unfiltered liquid discharge port for the first partial solution The liquid is discharged, and the filter cartridge is provided with a filtrate discharge port for the filtered second portion of the solution to flow out. The centrifugal filtration device of claim 5, wherein the first partial solution comprises a first heavy phase solution and a second heavy phase solution, and the first heavy phase solution and the second heavy phase solution are radially distributed The first heavy phase solution is further from the central axis of rotation than the second heavy phase solution. The centrifugal filtration device of claim 6, wherein the unfiltered liquid discharge port comprises a first unfiltered liquid discharge port and a second unfiltered liquid discharge port, the first unfiltered liquid discharge port and the second The unfiltered liquid discharge port is constructed to be radially distributed for the respective first heavy phase solution and the second heavy phase solution to flow out. The centrifugal filtration apparatus of claim 1 or 2, wherein the centrifugal drum is provided with a solution separating member for assisting in the separation of the solution. The centrifugal filter device of claim 1 or 2, wherein the centrifugal drum is provided with a filter cartridge cleaning member for removing particles accumulated on the filter material of the filter cartridge. The centrifugal filtration apparatus of claim 1 or 2, wherein the solution is supplied to the centrifugal drum in one of a continuous mode and a batch mode.