TWI577437B - Centrifugal filtering device and operation method thereof - Google Patents

Description

Centrifugal filter and its operation method

The invention relates to a centrifugal filter, in particular to a centrifugal filter which utilizes the rotation of a centrifugal drum or a rotary filter to generate centrifugal force, and centrifugally separates the raw material liquid from the light phase fluid and the heavy phase fluid.

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.

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, pre-loading unloading, and turning over the bag. For the type of unloading, etc., the detailed structure and principle of these centrifuges or filters can be found in the book "Industrial Centrifuge and Filter Selection Manual" (ISBN 978-7-122-18787-1, the entire contents of which are hereby incorporated by reference. In).

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.

Please refer to the first figure, which is a schematic structural view of a prior art centrifugal separator. As shown, a centrifugal separator PA100 includes a centrifuge body PA1, a rotating shaft PA2, and a screen assembly PA3, and the rotating shaft PA2 is rotatably disposed in the centrifuge body PA1, and the screen assembly PA3 is fixedly It is worn on the rotating shaft PA2 to rotate with the rotating shaft PA2. Wherein, when the rotating shaft PA2 rotates, the raw material liquid PA300 entering the filter assembly PA3 via the feeding port PA21 of one of the rotating shafts PA2 is rotatively flowed, thereby generating centrifugal force to filter the filter assembly PA3, and The particles contained in the raw material liquid PA300 are stacked on the screen assembly PA3 to form a solid filter cake PA200.

As described above, since the rotation of the rotating shaft PA2 drives the raw material liquid PA300 to rotate, the particles contained in the raw material liquid PA300 naturally move along with the flow direction of the raw material liquid PA300, and then accumulate on the filter assembly PA3. After the centrifugal separator PA100 is used for a period of time, the filtration speed of the centrifugal separator PA100 will decrease due to the increase of the thickness of the solid filter cake PA200, so that the user needs to stop the solid filter cake PA200 to stop, in order to maintain the filtration speed of the centrifugal filter PA100. .

In view of the prior art, the existing centrifugal separator particles and the filtrate move in the same direction to cause particles to accumulate on the filter material, so that the filtration rate is lowered or the cleaning filter material needs to be replaced. Accordingly, the main object of the present invention is to provide a centrifugal filter that utilizes the principle of centrifugal force and mass balance. The centrifugal force causes the particles to move in the direction of centrifugal force, and the mass balance forces the liquid to move in the other direction (filter material), so that the filtration speed is high and stable. It is not necessary to replace or clean the filter media often (or even completely).

In view of the above, the present invention provides a centrifugal filter for filtering a raw material liquid, which contains a plurality of particles, and the centrifugal filter includes a necessary technical means for solving the problems of the prior art. Centrifugal drum and a rotary filter. The centrifuge drum has an accommodating space for accommodating the raw material liquid. The rotary filter is rotatably disposed in the accommodating space, and includes a filter body and a filtrate discharge pipe. The filter system has a filter cartridge, and the filter cartridge surrounds a filtrate collection space; the filtrate A discharge pipe is coupled to the filter body and communicates with the filtrate collection space. Wherein, by rotating at least one of the centrifugal drum and the rotary filter, the raw material liquid is driven to generate a vortex, thereby causing the raw material liquid to form a heavy phase fluid to the centrifugal drum due to centrifugal force. a light phase fluid approaching the filter cartridge, wherein the centrifugal force of the particles is gradually decreased from the heavy phase fluid toward the light phase fluid, and the light phase flow system is filtered through the filter cartridge to the filtrate collection space. A filtrate is produced, and the filtrate is discharged through the filtrate discharge pipe to the centrifugal filter.

An additional technical means derived from the above-mentioned technical means is that the filter body further comprises a base and a top cover, and the base and the top cover are clamped on the upper and lower ends of the filter cartridge, and The filter cartridge surrounds the filtrate collection space, and the filtrate discharge pipe is coupled to the base.

An auxiliary technical means derived from the above-mentioned technical means is that the rotary filter further comprises a raw material liquid feed pipe coupled to the filter body and rotatably disposed therein. The raw material liquid feed pipe has at least one discharge port, and the discharge port communicates with the accommodating space, so that the raw material liquid enters the accommodating space via the raw material liquid feed pipe.

An auxiliary technical means derived from the above-mentioned technical means is that the cylinder system is a filter cylinder.

An auxiliary technical means derived from the above-mentioned necessary technical means is that the filtrate discharge pipe is rotatably disposed in the centrifugal drum.

An auxiliary technical means derived from the above-mentioned technical means is that the centrifugal rotating drum comprises a lower fixing seat, a cylindrical body and an upper fixing seat, and the lower fixing seat is provided with at least one liquid outlet connected to the accommodating space. The granule is discharged from the accommodating space by the liquid outlet, the cylindrical system is coupled to the lower fixing base, and the upper fixing base is coupled to the cylindrical body, and the accommodating space is the lower fixing seat, the circle The cylinder and the upper fixing seat are formed in a surrounding structure.

An auxiliary technical means derived from the above-mentioned necessary technical means is that the centrifugal filter further comprises a liquid collecting tank, and the centrifugal rotating drum Is rotatably disposed in the liquid collection tank, and the centrifugal drum is further provided with at least one liquid outlet connected to the accommodating space, the liquid collecting tank is configured to collect the heavy phase fluid discharged from the liquid outlet . The liquid collecting tank is further provided with an upper liquid collecting tank, and the upper fixing seat is provided with at least one overflow port communicating with the accommodating space, and the upper liquid collecting tank is correspondingly disposed above the liquid collecting tank.

An auxiliary technical means derived from the above-mentioned technical means is that the centrifugal drum comprises a filtering cylinder system for filtering the heavy phase fluid.

An auxiliary technical means derived from the above-mentioned technical means is that the rotary filter further comprises a spiral scraper disposed on the filter cartridge.

An auxiliary technical means derived from the above-mentioned technical means is that the rotary filter body further comprises a plurality of disks, and the disks are coupled to the filter cartridge.

A centrifugal filter operating method for operating a centrifugal filter according to claim 1, wherein the method comprises the steps of: (a) establishing a delivery line for storing the raw material liquid The raw material liquid storage container is connected to the accommodating space of the centrifugal rotating drum; (b) the raw material liquid stored in the raw material liquid storage container is fed into and filled with the accommodating space by using a pump; (c) driving the centrifugal Rotating at least one of the rotating drum and the rotating filter, the raw material liquid accommodated in the accommodating space is driven to generate a vortex, thereby forming the heavy phase fluid and the light phase fluid, and the filter cylinder is configured to The filtrate was filtered off with a light phase fluid.

As described above, compared with the prior art centrifugal separator, when the particles are separated from the raw material liquid by centrifugal force, the particles are accumulated on the filter medium for filtering the liquid because the particles move in the same direction as the liquid moves, thereby causing The filtration rate is reduced or needs to be cleaned and replaced; however, the present invention is provided by the filter in the centrifugal drum and the principle of mass balance. When the centrifugal drum rotates, the raw material liquid is divided into the centrifugal drum wall by centrifugal force. The heavy phase fluid and the light phase fluid moving toward the filter cartridge effectively prevent the particles from accumulating in the path of filtering the liquid, so the present invention can effectively use the filtering method in which the particles move in the opposite direction to the filtrate in comparison with the prior art. Achieve higher filtration speed, and can effectively delay the fouling of the filter material.

The specific embodiments of the present invention will be further described by the following examples and drawings.

PA100‧‧‧ Centrifugal Separator

PA1‧‧‧ centrifuge body

PA2‧‧‧ shaft

PA21‧‧‧ feed inlet

PA3‧‧‧ filter components

PA200‧‧‧solid filter cake

PA300‧‧‧ raw material liquid

100‧‧‧centrifugal filter

1‧‧‧ Centrifugal drum

11‧‧‧ lower seat

111‧‧‧Liquid outlet

12‧‧‧Cylinder

13‧‧‧上固定座

2‧‧‧Rotary filter

21‧‧‧Filter body

211‧‧‧ filter cartridge

212‧‧‧Base

213‧‧‧Top cover

22‧‧‧Development tube

23‧‧‧ raw material feed tube

231‧‧‧Outlet

3‧‧‧Liquid collection tank

S1‧‧‧ accommodating space

S2‧‧‧ filtrate collection space

100a‧‧‧centrifugal filter

1a‧‧‧ Centrifugal drum

13a‧‧‧上座

131a‧‧‧ overflow

3a‧‧‧Liquid collection tank

31a‧‧‧Liquid discharge pipe

32a‧‧‧Upper liquid collection tank

321a‧‧‧Drain valve

4a‧‧‧ bracket

100b‧‧‧centrifugal filter

1b‧‧‧ Centrifugal drum

211b‧‧‧Filter cartridge

24b‧‧‧Spiral scraper

100c‧‧‧centrifugal filter

2c‧‧‧Rotary filter

211c‧‧‧ filter cartridge

214c‧‧‧disc

100d‧‧‧centrifugal filter

1d‧‧‧ Centrifugal drum

11d‧‧‧ lower seat

12d‧‧‧Cylinder

13d‧‧‧上固定座

200‧‧‧Transportation line

201‧‧‧ entrance end

202‧‧‧export end

203‧‧‧First return end

204‧‧‧second return end

300‧‧‧ raw material storage container

C1, C2, C3‧‧‧ curves

FC‧‧‧ filter cake

P‧‧‧ pump

P1, P2‧‧‧ pressure gauge

V1‧‧‧First Return Valve

V2‧‧‧ flow control valve

V3‧‧‧Second return valve

The first drawing is a schematic structural view of a prior art centrifugal separator; the second drawing is a schematic structural view of a centrifugal filter provided by the first preferred embodiment of the present invention; and the third drawing is a second preferred embodiment of the present invention. A schematic view of the structure of the centrifugal filter provided; the fourth drawing shows the structure of the centrifugal filter provided by the third preferred embodiment of the present invention; and the fifth figure shows the centrifugal provided by the fourth preferred embodiment of the present invention. Schematic diagram of the filter; 6 is a schematic structural view showing a centrifugal filter provided by a fifth preferred embodiment of the present invention; and a seventh is a schematic view showing a system for practical use of the centrifugal filter provided by the first preferred embodiment of the present invention; The figure 8 shows a data distribution diagram of the time and filtration amount of the prior art general centrifugal separator and the centrifugal filter of the present invention.

Please refer to the second drawing, which is a schematic structural view of a centrifugal filter provided by the first preferred embodiment of the present invention. As shown in the figure, a centrifugal filter 100 is used for filtering a raw material liquid, the raw material liquid may comprise a plurality of kinds of particles (not shown), and the centrifugal filter 100 comprises a centrifugal rotating drum 1 and a rotating filter 2 And a liquid collection tank 3. The centrifugal drum 1 comprises a lower fixing seat 11, a cylindrical body 12 and an upper fixing seat 13. The lower fixing seat 11 is provided with a plurality of liquid outlets 111 (only one is shown), and the cylindrical body 12 is coupled to the lower fixing. The seat 11 and the upper mount 13 are coupled to the cylindrical body 12, wherein the lower mount 11, the cylindrical body 12 and the upper mount 13 are enclosed to form an accommodation space S1. The accommodating space S1 is a tank of a general centrifuge, so the shape thereof may be a cylindrical shape, a trough shape, a cone shape, or a shape such as a conventional telecentric centrifuge or a cyclone separator, but is not limited thereto, and is used in practice. The material of the upper and lower fixing bases 11, the cylindrical body 12 and the upper fixing seat 13 is, for example, a material such as acryl, which is light and hard, but is not limited thereto, and the lower fixing base 11 and the upper fixing base 13 are, for example, The fixing by means of screw locking (but not limited to this, it can also be locked by other fixing methods), and then the cylinder 12 is fixed between the lower holder 11 and the upper holder 13, and the liquid outlet 111 is actually provided with a valve to control the discharge flow rate.

The rotary filter 2 is rotatably disposed in the accommodating space S1, and the rotary filter 2 includes a filter body 21, a filtrate discharge pipe 22, and a raw material liquid feed pipe 23, and the filter body 21 includes a filter. a cartridge 211, a base 212, and a top cover 213. In practical practice, the filter cartridge 211 is a cylindrical structure composed of a filter material, but is not limited thereto, and the filter cartridge 211 may also be a folded filter medium, or It is a generalized filter material. The base 212 is clamped to the bottom end of the filter cartridge 211, and the top cover 213 is clamped at the top end of the filter cartridge 211, so that the upper and lower ends of the filter cartridge 211 are clamped and fixed by the base 212 and the top cover 213, and filtered. The cartridge 211 and the base 212 and the top cover 213 define a filtrate collection space S2.

The filtrate discharge pipe 22 is rotatably inserted through the fixing base 11 below the centrifugal drum 1, and is coupled to the base 212 of the filter body 21, and the filtrate discharge pipe 22 is further connected to the filtrate collecting space S2. The filtrate discharge pipe 22 and the lower mount 11 are pivotally connected through the bearing, so that the filtrate discharge pipe 22 and the lower mount 11 can be relatively rotated.

The raw material liquid feeding pipe 23 is rotatably inserted through the fixing seat 13 on the centrifugal rotating drum 1, and is connected to the top cover 213, and the raw material liquid feeding pipe 23 has a plurality of discharging ports 231 (only one is shown in the figure) The discharge port 231 is connected to the accommodating space S1, so that the raw material liquid can enter the accommodating space S1 via the raw material liquid supply pipe 23. The raw material liquid feed pipe 23 and the upper fixed seat 13 are pivotally connected through the bearing, so that the raw material liquid feed pipe 23 and the upper fixed seat 13 can be relatively rotated.

The liquid collecting tank 3 is sleeved outside the centrifugal drum 1, and the centrifugal drum 1 is rotatably disposed in the liquid collecting tank 3.

As described above, in practice, when the raw material liquid is continuously fed from the raw material liquid feed pipe 23 into the accommodating space S1 via the discharge port 231, and the amount of the controlled feed is slightly larger than the amount of the liquid filtered by the filter cartridge 211, By rotating the centrifugal drum 1 or the rotary filter 2, the raw material liquid accommodated in the accommodating space S1 is rotated to generate eddy current, and the raw material liquid is roughly formed into a centrifugal direction due to the centrifugal force. The heavy phase fluid of the cylinder 1 and the light phase fluid approaching the filter cartridge 211, while the heavy phase fluid is a fluid (containing particles) which is greatly affected by the centrifugal force, and the light phase fluid is a fluid which is less affected by the centrifugal force, and is The heavy-phase fluid that is directed toward the cylindrical body 12 is settled downward and is discharged into the liquid collecting tank 3 by the liquid outlet 111 of the lower fixing seat 11 in the form of a liquid, that is, a turbid liquid containing a large amount of heavy particles is formed, and the liquid outlet 111 can be It is set to operate for a certain period of time; in addition, when the flow rate of the raw material liquid into the accommodating space S1 is greater than or equal to the flow rate of the filtrate discharged from the filtrate discharge pipe 22, the light phase fluid is brought close to the filter cartridge 211, thereby forcing the light phase fluid to pass. The filter cartridge 211 and the filtrate collection space S2 to produce a clear filtrate, the filtrate may be discharged more filtrate discharge pipe 22. It is of course also possible to set the light phase fluid to approach the filter cartridge 211 when the flow rate of the raw material liquid into the accommodating 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 by the filter cartridge 211. The light phase fluid is forced through the filter cartridge 211 to produce a clear filtrate in the filtrate collection space S2, and the filtrate is more discharged from the filtrate discharge pipe 22.

Further, regarding the above-mentioned centrifugal drum 1 or the rotary filter Since the rotary filter 2 is connected to the filtrate discharge pipe 22 and the raw material liquid feed pipe 23, the filter discharge pipe 22 and the raw material liquid feed pipe 23 can be coupled to the drive motor to drive the rotary filter 2 to rotate, or The centrifugal drum 1 is directly coupled to the driving motor to drive the centrifugal rotating drum 1 to rotate; wherein the user can control whether the centrifugal rotating drum 1 or the rotating filter 2 is rotated in the opposite direction or in the opposite direction according to actual requirements. Then, the vortex flow rate of the raw material liquid in the accommodating space S1 is increased, and the efficiency of the filtration is relatively increased. The rotation of the rotary filter 2 naturally drives the rotation of the filter cartridge 211, and the shearing force caused by the rotation makes the particles less likely to adhere. At the surface of the filter cartridge 211, the fouling is retarded, thereby increasing the filtration rate.

Please refer to the third drawing, which is a schematic view showing the structure of the centrifugal filter provided by the second preferred embodiment of the present invention. As shown, a centrifugal filter 100a is similar to the above-described centrifugal filter 100, and the difference is mainly that the centrifugal filter 100a further includes a bracket 4a for supporting a liquid collection tank 3 similar to the above. The liquid collecting tank 3a further includes a liquid discharge pipe 31a and an upper liquid collecting tank 32a, wherein when the liquid collecting tank 3a collects the liquid centrifugally separated by the centrifugal drum 1a, The liquid discharge pipe 31a guides the liquid out. In addition, the upper liquid collecting groove 32a is disposed on the upper fixing seat 13a, and the upper fixing seat 13a is provided with a plurality of overflow ports 131a communicating with the accommodating space (not shown), and the upper liquid collecting groove 32a is used for collecting The sub-light fluid overflowed from the overflow port 131a, and the upper liquid collecting tank 32a is further provided with a discharge valve 321a for controlling the discharge amount of the sub-light liquid.

Please refer to the second and fourth figures. The fourth picture shows the present A schematic structural view of a centrifugal filter provided by the third preferred embodiment of the invention. As shown, a centrifugal filter 100b is similar to the centrifugal filter 100 described above, except that a centrifugal drum 1b further includes a spiral scraper 24b, and the spiral scraper 24b is a filter cartridge 211b included therein. Further, when the filter cartridge 211b is rotated, the particles accumulated on the inner wall of the cylindrical body 12b are scraped off by the spiral scraper 24b provided outside.

Please refer to the second and fifth figures. The fifth figure shows the structure of the centrifugal filter provided by the fourth preferred embodiment of the present invention. As shown, a centrifugal filter 100c is similar to the centrifugal filter 100 described above, except that the filter body (not shown) of a rotary filter 2c contains plural numbers more than the filter body 21 described above. a disc 214c, and the disc 214c is integrally formed outwardly and downwardly from the filter cartridge 211c, that is, the disc 214c and the filter cartridge 211c are the same filter material, thereby driving the disc when the filter body rotates. The disk 214c is rotated to accelerate the filtration of the raw material liquid.

Please refer to the sixth drawing, which is a schematic view showing the structure of the centrifugal filter provided by the fifth preferred embodiment of the present invention. As shown, a centrifugal filter 100d includes a centrifugal drum 1d, a rotary filter 2, and a liquid collection tank 3. The centrifugal filter 100d is similar to the centrifugal filter 100 described above, and the difference is mainly that the centrifugal filter 100d replaces the centrifugal drum 1 with the centrifugal rotating drum 1d, and the centrifugal rotating drum 1d includes a lower fixing seat 11d and a cylinder. The body 12d and an upper fixing seat 13d are fixed between the lower fixing seat 11d and the upper fixing seat 13d. In the present embodiment, the cylindrical body 12d is a filtering cylindrical body having a filtering function. In practical use, the circle The tubular body 12d may be a structure containing a filter material or a structure made of a filter material.

As described above, after the raw material liquid enters the accommodating space (not shown) surrounded by the lower fixing seat 11d, the cylindrical body 12d and the upper fixing seat 13d via the raw material liquid feeding tube 23, when the centrifugal rotating drum 1d Or the rotating filter 2 drives the raw material liquid to rotate due to the rotation and generates a light phase fluid which is directed toward the cylindrical body 12d and the light phase fluid approaching the filter cartridge 211 due to the centrifugal force, except that the light phase fluid is filtered out through the filter cartridge 211. The filtrate, the heavy phase fluid that is turned toward the cylindrical body 12d, also filters out the filtrate into the liquid collecting tank 3 because the cylindrical body 12d is a filtering cylindrical body having a filtering function, and the particles contained in the heavy phase fluid are also A filter cake FC is formed on the inner wall of the cylindrical body 12d. Thus, the centrifugal filter 100d provided in the embodiment can pass through the filter cartridge 211 of the rotary filter 2 to stably produce the filtrate. The output of the filtrate is increased by the cylindrical body 12d having a filtering function, and the filter cake FC can be efficiently collected, and the filter cake has a high solid content due to the centrifugal force for a long time.

Please refer to the second and seventh figures, which are schematic diagrams showing the actual operation of the centrifugal filter provided by the first preferred embodiment of the present invention. As shown in the figure, the operation method of the centrifugal filter 100 of the present invention firstly establishes a delivery line 200, so that a raw material liquid storage container 300 storing the raw material liquid can be connected to the centrifuge drum 1 via the delivery line 200. Set space S1. The delivery line 200 has an inlet end 201, an outlet end 202, a first reflow end 203 and a second reflow end 204. The inlet end 201 is connected to the bottom of the raw material liquid storage container 300, and the outlet end. 202 is a raw material liquid feed pipe 23 connected to the centrifugal filter 100, and the first return end 203 and the first The second return end 204 is in communication with the top of the stock solution storage container 300.

The raw material liquid stored in the raw material liquid storage container 300 is fed into the accommodating space S1 by a pump P; wherein the pump P is disposed adjacent to the inlet end 201 at the inlet end 201 and the outlet end of the delivery line 200. A first return valve V1 is further disposed between the inlet end 201 and the first return end 203, and a flow control valve V2 is further disposed between the inlet end 201 and the outlet end 202. The inlet end 201 and the second return end are further disposed. A second return valve V3 is further disposed between the 204, and two pressure gauges P1 and P2 are further disposed on both sides of the flow control valve V2.

The accommodating space S1 is filled with the raw material liquid and drives at least one of the centrifugal drum 1 and the rotary filter 2 to rotate, so that the raw material liquid accommodated in the accommodating space S1 is driven to generate eddy current, thereby forming a heavy phase fluid and a light phase fluid. The light phase fluid is filtered through the filter cartridge 211 to filter out the filtrate; wherein, the user can record the filtrate flow rate of the filtrate, and when the liquid outlet 111 is opened continuously, the flow rate of the raw material liquid into the accommodating space S1 is controlled to be larger than the filtrate filter. The sum of the discharge flow rate and the liquid discharge amount, and when the liquid outlet 111 is closed, the flow rate of controlling the raw material liquid into the accommodating space S1 is larger than the filtrate filtration flow rate.

As described above, at the beginning of the actual operation, the first return valve V1, the flow control valve V2 and the second return valve V3 remain fully open; and when at least one of the centrifugal drum 1 and the rotary filter 2 starts rotating When the user can adjust the flow rate of the first return valve V1, and observe the pressure value of the pressure gauge P1, the pressure of the raw material liquid into the accommodating space S1 reaches a preset pressure value, and the pressure value is mainly related to centrifugal filtration. The filtration speed of the machine 100 is related, and within a certain pressure control range, when the pressure is increased, it can be accelerated. The filtration rate of the centrifugal filter 100. In addition, after the accommodating space S1 is filled with the raw material liquid, the user can discharge the residual air in the accommodating space S1 by the opening control of the second return valve V3.

Please refer to the eighth figure. The eighth figure shows the data distribution of the time and filter flux of the prior art general filter and the centrifugal filter of the present invention. As shown in the figure, the prior art general filter and the centrifugal filter of the present invention (such as the centrifugal filter 100 provided in the first preferred embodiment described above), in the filter medium and the raw material liquid (containing 0.3 wt%, 37-44) The micron-sized niobium carbide particles are subjected to an experimental test for about one hour under the same conditions, and a data distribution as shown in the eighth graph can be obtained, wherein the curve C3 represents the filtrate flux obtained after testing using the prior art general filter. The data distribution is shown, and the curve C2 indicates the distribution of the filtration flux data obtained after the test using the centrifugal filter of the present invention; in addition, the curve C1 is the distribution of the filtration flux data obtained by the filtration test using fresh water.

According to the above, after filtering the water for one hour, the filter flux (Filtrate Flux) can be known from the curve C1 to be about 200 LPH (L/m ² -hr-bar), which is the maximum using the filter material. Flux, because it is filtering the clean water, and the general filter of the prior art after filtering the raw material liquid for one hour, can be seen from the curve C3 that the filtration flux is reduced to about 75 LPH, because the particles begin to accumulate in the particle. On the filter medium, compared with this, after the filtration test of the raw material liquid by the centrifugal filter 100 of the present invention for one hour, the filtration flux can be known from the curve C2 to be about 150 LPH, which can be clearly known that the same The filtration rate of the centrifugal filter of the present invention is about twice the filtration rate of a typical filter under the same operating conditions. In addition, when the operation time is increased, the prior art general filter is more likely to require shutdown to be removed due to the increase in the thickness of the filter cake. However, the filtration of the centrifugal filter of the present invention not only greatly reduces the influence of the filter cake, but also It can be operated continuously by discharging the filter residue without stopping the machine.

In summary, compared with the centrifugal centrifuge of the prior art, centrifugal force is used to separate impurities such as particles from the raw material liquid, but basically the direction of movement of the particles and the liquid is consistent, causing the particles to accumulate on the centrifugal filter. Therefore, the filtration speed is lowered or the cleaning is required to be replaced; however, the present invention allows the heavy phase fluid (containing particles) to be generated by the centrifugal force of the centrifugal drum by placing the filter in the centrifugal drum and even allowing the filter to rotate. Moving toward the wall of the centrifuge drum, and by the operation of the feed amount slightly larger than or equal to the discharge amount, the light phase fluid (even almost no particles) is moved in the opposite direction, that is, the filter cartridge is moved, and filtered by the filter cartridge. The filtrate is filtered out in the filtrate collection space, and the filtrate is discharged through the filtrate discharge pipe to the centrifugal filter. Therefore, compared with the prior art, the main technical features of the present invention are neither dead end filtration nor filtration. Cake filtration), also non-sweep filtration, is a filtration method in which the particles move in the opposite direction to the filtrate, thus achieving higher filtration rates and delaying filter fouling.

In addition, since the present invention is to arrange the rotary filter in the centrifugal drum, when the eddy current generated by the rotation of the centrifugal drum or the rotary filter is combined, the larger and heavier particles will be centrifuged due to the centrifugal force. The inner wall of the drum moves without blocking on the surface of the rotating filter, so that the raw material liquid can be effectively filtered through the rotary filter, thereby effectively increasing the use time without frequent cleaning or The filter cartridge of the rotary filter is eliminated, and the maximum filtration speed is effectively maintained, so that the present invention can be applied not only to the batch operation but also to the continuous operation.

Furthermore, since the present invention is further provided with a liquid collecting tank, it can be used to collect the liquid which is discharged from the liquid outlet and rich in particles, and even has an upper liquid collecting tank to enable the raw material liquid to be fractionally separated and filtered.

In addition, when the centrifugal separator is subjected to filtration, the filtration rate is likely to be lowered due to the accumulation of particles on the filter medium. However, when the centrifugal filter of the present invention performs centrifugal filtration, it is known from the above that the most perfect condition is that the centrifugal force is sufficient. Large, all particles move to the cylinder wall of the cylinder of the centrifugal drum; however, if the centrifugal force is insufficient, there will still be a small amount of particles accumulated on the filter body, and the filtration speed will still slowly decrease, so the user can A flow sensor is disposed at the filtrate outlet of the filtrate discharge pipe to correspondingly reduce the feed flux of the raw material liquid as the filtrate flow rate decreases. For example, taking the curve C2 of the eighth figure as an example, when the operation is 2000 seconds, the filtration speed is about 200 LPH, and when the operation is 3000 seconds, the filtration speed is about 170 LPH, which is reduced by 30 LPH, so the feed amount can be adjusted at 3000 seconds. Low 30LPH.

In practical practice, the present invention can be applied, for example, to a process such as wafer cutting and polishing. Since the main constituent element of the wafer is Si, SiC is often used as the abrasive particles, and an organic solvent such as PEG (polyethylene glycol) is used. In order to save costs, the organic solvent is usually recovered. Therefore, when the PEG containing SiC and Si enters the centrifugal filter of the present invention, the heaviest SiC particles are smashed to the inner wall of the cylinder due to centrifugal force, and are discharged from the liquid. Discharge, and the second heavy Si particles will be discharged by the overflow outlet, and the lightest organic The solvent PEG is filtered through the filter cartridge to obtain a clear filtrate in the filtrate collection space, and the organic solvent is effectively recovered, thereby greatly reducing the cost; in order to prevent the SiC particles from accumulating on the inner wall of the cylindrical body, The spiral scraper is placed on the rotary filter, and the SiC particles deposited on the inner wall of the cylindrical body are scraped off by a rotary scraper to be discharged.

Although the above description is directed to liquid filtration, those skilled in the art can readily apply the above disclosed techniques to gas filtration applications.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

100‧‧‧centrifugal filter

1‧‧‧ Centrifugal drum

11‧‧‧ lower seat

111‧‧‧Liquid outlet

12‧‧‧Cylinder

13‧‧‧上固定座

2‧‧‧Rotary filter

21‧‧‧Filter body

211‧‧‧ filter cartridge

212‧‧‧Base

213‧‧‧Top cover

22‧‧‧Development tube

23‧‧‧ raw material feed tube

231‧‧‧Outlet

3‧‧‧Liquid collection tank

S1‧‧‧ accommodating space

S2‧‧‧ filtrate collection space

Claims (10)

A centrifugal filter for centrifugally filtering a raw material liquid, the raw material liquid comprising a plurality of particles, the centrifugal filter comprising: a centrifugal rotating drum; and a rotating filter, which is relatively rotatablely disposed on the centrifugal rotating Inside the cylinder, and comprising: a filter body having a filter cartridge, the filter cartridge enclosing a filtrate collection space, and separating an accommodation space surrounding the filtrate collection space in the centrifugal drum, and The accommodating space is for accommodating the raw material liquid; and a filtrate discharge pipe is connected to the filter body and communicates with the filtrate collecting space; wherein the centrifugal force and the mass balance method are used, the centrifugal rotating drum Rotating at least one of the rotating filter causes the raw material liquid to be driven to generate a vortex, thereby causing the raw material liquid to form a heavy phase fluid to the centrifugal rotating cylinder due to centrifugal force, and mass balance forces the liquid to the filtering The cylinder moves into a light phase fluid approaching the filter cartridge, and the weight of the particles is gradually decreased from the heavy phase fluid toward the light phase fluid, and the light phase flow system Through the filter of the filter cartridge to produce a filtrate to the filtrate collecting space, so that the filtrate discharge pipe discharges the centrifugal filter through the filtrate. The centrifugal filter of claim 1, wherein the filter body further comprises a base and a top cover, the base and the base The top cover is affixed to the upper and lower ends of the filter cartridge, and the filtrate collection space is surrounded by the filter cartridge, and the filtrate discharge pipe is coupled to the base. The centrifugal filter of claim 1, wherein the rotary filter further comprises a raw material liquid feed pipe coupled to the filter body and rotatably disposed through The raw material liquid feed pipe has at least one discharge port, and the discharge port communicates with the accommodating space, so that the raw material liquid enters the accommodating space via the raw material liquid feed pipe. The centrifugal filter according to claim 1, wherein the filtrate discharge pipe is rotatably inserted through the centrifugal drum. The centrifugal filter according to claim 1, wherein the centrifugal drum comprises a lower fixing seat, a cylindrical body and an upper fixing seat, and the lower fixing seat is provided with at least one liquid connected to the accommodating space. An outlet, the heavy phase flow system is discharged from the liquid outlet to the accommodating space, the cylindrical system is coupled to the lower fixed seat, the upper fixed seat is coupled to the cylindrical body, and the accommodating space is supported by the lower fixed seat The cylindrical body and the upper fixing seat are formed in a surrounding structure. The centrifugal filter according to claim 1, further comprising a liquid collecting tank rotatably disposed on the liquid In the body collecting tank, the centrifugal drum is further provided with at least one liquid outlet connected to the accommodating space, and the liquid collecting tank is configured to collect the heavy phase fluid discharged from the liquid outlet. The centrifugal filter of claim 1, wherein the centrifugal drum comprises a filter cylinder for filtering the heavy phase fluid. The centrifugal filter of claim 1, wherein the rotary filter further comprises a spiral scraper disposed on the filter cartridge. The centrifugal filter of claim 1, wherein the filter body further comprises a plurality of disks, the disks being coupled to the filter cartridge. A centrifugal filter operating method for operating a centrifugal filter according to claim 1, wherein the method comprises the steps of: (a) establishing a delivery line for storing the raw material liquid The raw material liquid storage container is connected to the accommodating space of the centrifugal rotating drum; (b) the raw material liquid stored in the raw material liquid storage container is fed into and filled with the accommodating space by a pump; and (c) driving the At least one of the centrifugal drum and the rotary filter rotates, The raw material liquid accommodated in the accommodating space is driven to generate a vortex, thereby forming the heavy phase fluid and the light phase fluid, and the filter cylinder filters the light phase fluid out of the filtrate.