A multi-functional stacked concentration filter

Abstract

The present invention relates to the field of concentrated filters, and specifically to a multi-functional stacked concentrated filter, which includes a bracket, an upper end cover, and a lower end cover. A concentrated liquid discharge section is installed in the middle of the lower end cover, and a plurality of annular filter frames stacked on top of each other are installed on the top of the lower end cover. An inlet section is installed at the bottom of the upper end cover, and the bottom of the inlet section is placed on the top of the annular filter frame. An inlet port is installed on the side wall of the inlet section. A filter disc is installed on the inner side surface of the annular filter frame. The inside of the filter disc is hollow, and both the upper and lower layers are filter disc filter surfaces. A clear liquid outlet and a backwash liquid inlet are symmetrically installed on the outer wall of the annular filter frame. A main shaft is rotatably installed in the middle of the upper end cover, and a scraper assembly is installed on the outer side surface of the main shaft, which is placed between every two filter discs and has a spacing from the two filter discs. The present invention adopts a dynamic cross-flow filtration method, enabling the fluid to flow through the filter surfaces of all filter discs in series, realizing continuous solid-liquid separation of liquid and solid particles, and recycling the catalyst to obtain a higher concentration efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of concentration filters, and particularly to a multi-functional laminated concentration filter. Background Art

[0002] Liquid-phase hydrogenation reactions (such as TDI production) are used in many chemical productions. Usually, a catalyst is added to make the reaction proceed smoothly. If the reaction is to be run continuously rather than intermittently, a thickener that can concentrate the catalyst from the reactants needs to be set outside the reactor, and the concentrated catalyst slurry is sent back to the reactor for recycling, and the clear liquid is taken out to make the reactants meet the requirements of downstream processes. Since the particle size of the usually used catalyst is small, it has become a difficult problem to separate the catalyst slurry from the reactants so that the clear liquid taken out by the equipment has sufficient cleanliness to meet the requirements of downstream processes.

[0003] At present, the equipment for solving this difficult problem in China is a foreign monopoly product, which is expensive, has high maintenance costs, and high energy consumption. Since it uses a hydraulic drive method to drive the main shaft to rotate, the complexity of the hydraulic system makes its reliability low, failure rate high, and energy loss large, resulting in a transmission efficiency of only about 60%. Taking a foreign monopoly equipment with a filtration area of 40 square meters as an example, the power of its driving motor is 55KW. Since the clear liquid is taken out in a parallel manner, each slurry only flows through the surfaces of 2 filter layers, and the amount of clear liquid taken out is small, and the concentration efficiency is low. One such equipment can only handle about 40m 3 / hr of slurry, and the clear liquid taken out is only about 4.5m 3 / hr, and the concentration efficiency is only 2.25%, with low efficiency.

[0004] Currently, in the relevant domestic chemical industry, there is an urgent need for a concentration filter that can break foreign monopolies, greatly improve the filtration efficiency and performance, and at the same time reduce energy consumption, investment costs, and operating expenses. Therefore, the present invention provides a multi-functional laminated concentration filter to solve the above problems. Summary of the Invention

[0005] In view of the above situation, to overcome the deficiencies of the prior art, the present invention provides a multi-functional laminated concentration filter to solve the problems raised in the above background art.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A multifunctional stacked concentration filter, comprising a bracket, an upper end cover, and a lower end cover. The top of the bracket is fixedly installed with the lower end cover. In the middle of the bottom surface of the lower end cover, a concentrated liquid discharge section is penetrated and fixedly installed. On the top of the lower end cover, a plurality of annular filter frames are stacked and placed. The bottom of the upper end cover is fixedly installed with an annular feed section. The bottom of the feed section is placed on the top of the uppermost annular filter frame. A feed port is installed on the side wall of the feed section. On the inner side surface of each annular filter frame, an annular filter disc is installed. The inside of the filter disc is hollow, and both the upper and lower layers are filter disc filter surfaces. On the outer wall of each annular filter frame, a clear liquid outlet and a backwash liquid inlet that are communicated with the inside of the filter disc and are symmetrically positioned are fixedly installed. In the middle of the upper end cover, a main shaft is rotatably installed. On the outer side surface of the main shaft, a plurality of scraper assemblies are installed, each of which is respectively located between every two filter discs and has a spacing from the two filter discs.

[0008] Preferably, it further includes a double-end mechanical seal device, a bearing box, a coupling, a speed reducer, and a motor. The main shaft is suspended in the bearing box. The double-end mechanical seal device seals the main shaft. A sliding bearing sleeve is fixedly installed inside the concentrated liquid discharge section. The main shaft passes through the middle of a plurality of filter discs and is installed in the sliding bearing sleeve. The motor and the speed reducer are directly connected and are connected to the main shaft through a coupling. A concentrated liquid outlet is provided at the bottom of the concentrated liquid discharge section.

[0009] Preferably, screw rings are fixedly installed on the outer walls of a plurality of the annular filter frames. The upper end cover and the lower end cover are tightened and fixed through a screw nut assembly that passes through a plurality of screw rings.

[0010] Preferably, the filter disc filter surface is a multi-layer metal sintered layer structure.

[0011] Preferably, the spacing between the scraper assembly and the two filter discs above and below it is 3-6 mm.

[0012] Preferably, the scraper assembly includes a scraper sleeve, a scraper disc, a scraper auger box, a lower layer filter cake scraper, an upper layer filter cake scraper, a filter cake inlet groove, a filter cake auger, an auger drive gear ring, and an auger drive gear;

[0013] The scraper sleeve is fixedly installed on the outside of the main shaft. A scraper disc is installed on the outside of the scraper sleeve. A plurality of scraper auger boxes with open bottoms are fixedly installed on the outer side surface of the scraper disc. A lower layer filter cake scraper is fixedly installed at the bottom end of the side surface of the scraper auger box facing its rotation direction. An upper layer filter cake scraper is fixedly installed at the top of the scraper auger box. A filter cake inlet groove located above the lower layer filter cake scraper penetrates through the side surface of the scraper auger box. A filter cake auger is rotatably installed in the scraper auger box. A auger drive gear ring is fixedly installed on the top of each filter disc. One end of each filter cake auger away from the scraper disc extends out of the scraper auger box and is coaxially fixedly installed with a auger drive gear meshing with the auger drive gear ring.

[0014] Preferably, a filter cake dial ring is rotatably installed coaxially on the top surface of the scraper disc. The filter cake dial ring is in a circular ring shape, and a plurality of arc-shaped dial pieces evenly distributed in the circumferential direction are fixedly installed on its outer side surface. A rack ring groove is formed at the bottom of the filter cake dial ring. A dial ring rack is fixedly installed in the rack ring groove. A gear groove penetrates between the top surface and the bottom surface of the scraper disc. One end of the filter cake auger close to the scraper disc penetrates into the gear groove and is coaxially fixedly installed with a dial ring gear meshing with the dial ring rack.

[0015] Preferably, the filter cake dial ring is a conical ring and has the same outer diameter as the scraper disc. The plurality of arc-shaped dial pieces are evenly distributed in the circumferential direction on its conical surface.

[0016] Preferably, the scraper disc is sleeved and installed on the outside of the scraper sleeve. A scraper adjustment groove is formed on the outer side surface of the scraper sleeve. A scraper adjustment block located inside the scraper adjustment groove is fixedly connected to the inner side surface of the scraper disc. A scraper adjustment screw threadedly matched with the scraper adjustment block is rotatably installed between the top surface and the bottom surface of the scraper adjustment groove. A screw counterbore is formed on the top surface of the scraper sleeve. The top end of the scraper adjustment screw penetrates into the screw counterbore and is connected with an internal hexagonal screw head.

[0017] A method for slurry concentration using a multi-functional stacked concentrator filter is characterized in that the steps are as follows:

[0018] a. The slurry containing the catalyst enters the feeding section from the feeding port and flows parallel through the filter disc filter surfaces of each filter disc in series.

[0019] b. When the slurry flows through the filter disc filter surface in parallel, under the push of the pressure energy, part of the liquid respectively passes through the filter disc filter surface to reach the internal space of each filter disc, and then flows out from the clear liquid outlet connected to the filter disc. After the clear liquid flowing out from each clear liquid outlet is collected, it is transported to the product refining system.

[0020] c. Some solid particulate matters such as catalysts entrained in the slurry are intercepted by the filter surface of the filter disks and form a filter cake on the surface. After the clear liquid of the slurry is extracted by each filter disk, a concentrated liquid is formed and enters the concentrated liquid discharging section, and finally is discharged from the concentrated liquid outlet and returned to the reaction system for reuse.

[0021] d. The backwashing liquid enters the interior of each filter disk from each backwashing liquid inlet, passes through the filter surface of each filter disk from the inside to the outside in the reverse direction, and regenerates the filter surface of the filter disk by backwashing. The filter cake washed away by the backwashing liquid is discharged from the concentrated liquid outlet to the waste catalyst storage tank of the system.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The stacked type concentrating filter of the present invention adopts a dynamic cross-flow filtration method, enabling the fluid to flow through the filter surfaces of all filter disks in series, realizing continuous solid-liquid separation of the liquid and solid particulate matters, recycling the catalyst, obtaining a higher concentration efficiency, greatly improving the equipment performance, and realizing the continuous operation of chemical production. The direct connection method of the motor and the reducer is adopted, and the main shaft is connected through a coupling, reducing the intermediate links and making the transmission efficiency reach more than 95%.

[0024] 2. The stacked type concentrating filter of the present invention continuously scrapes the filter cake formed on the surface of the filter surface with a rotary scraper, enabling the filter cake layer to be continuously broken and the filter cake layer to be updated in a timely manner, greatly delaying the growth of the filtration resistance and making the filtration working time of the equipment longer.

[0025] 3. When the scraper disk drives a plurality of scraper auger boxes to rotate circumferentially, the scraped filter cake can enter the interior of the scraper auger box from the filter cake inlet groove. At the same time, the scraper auger drives the auger drive gear to rotate circumferentially, so that the auger drive gear meshes with the auger drive gear ring to rotate, thereby driving the filter cake auger to rotate. The filter cake auger can quickly move the filter cake entering the scraper auger box towards the center of the filter disk, so that the filter cake falls downward, avoiding the residue of the filter cake on the surface of the filter disk.

[0026] 4. The stacked type concentrating filter of the present invention supports off-line backwashing. After the filtration resistance of the present invention reaches the upper limit value, it can be backwashed by stopping the machine without disassembling the equipment. When backwashing, the backwashing liquid is introduced from the backwashing liquid inlet, so that the backwashing liquid can pass through the filter surface of the filter disk from the inside to the outside in the reverse direction, washing off the filter cake layer outside the filter surface to achieve the purpose of backwashing and regeneration. Usually, valves are installed at the backwashing liquid inlets of each filter disk, enabling each filter disk to be backwashed separately to achieve the best backwashing effect.

[0027] 5. The stacked concentration filter of the present invention can also be subjected to normal flushing after backwashing. During normal flushing, the stock solution of the slurry is introduced from the slurry inlet, the valve at the filtrate outlet is closed, and the slurry tangentially flows through the filtration surface of each filter disc in a non-concentrated state, flushing away the residual filter cake on the filtration surface. The waste liquid after the above-mentioned backwashing and the stock solution of the slurry after normal flushing are discharged from the concentrated liquid outlet. Usually, this liquid is sent to the waste catalyst storage tank of the system for further treatment. After backwashing and normal flushing, the regeneration of the filter medium is achieved, and it can be reused in the system without disassembling the equipment to clean the filter discs, effectively saving the equipment maintenance workload.

[0028] 6. Through the method for continuous concentration of slurry and continuous solid-liquid separation provided by the present invention, the purpose of continuously extracting the clear liquid from the reaction product and continuously concentrating the catalyst and then returning it to the reaction system for reuse can be achieved. The clear liquid extracted has removed the catalyst and reaction by-products and is sent to the product refining system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view of the present invention.

[0030] Figure 2 It is a top view of the present invention.

[0031] Figure 3 It is a three-dimensional schematic diagram of the present invention.

[0032] Figure 4 For the present invention Figure 3 An enlarged view of part A in the present invention.

[0033] Figure 5 It is a sectional view of the present invention.

[0034] Figure 6 It is a sectional schematic diagram of the stacked installation of multiple filter discs of the present invention.

[0035] Figure 7 For the present invention Figure 5 An enlarged view of part B in the present invention.

[0036] Figure 8 For the present invention Figure 5 An enlarged view of part C in the present invention.

[0037] Figure 9 It is a schematic diagram of the working principle of the present invention.

[0038] Figure 10 It is a working flow chart of the present invention during continuous concentration and filtration of the slurry.

[0039] Figure 11 It is a sectional view of the scraper auger box and the filter cake auger of the present invention.

[0040] Figure 12 It is a three-dimensional sectional view of the scraper auger box and the filter cake auger of the present invention.

[0041] Figure 13 For the present invention Figure 12 An enlarged view of the position D in the present invention.

[0042] Figure 14 A schematic structural view of the lower filter cake scraper and the upper filter cake scraper of the present invention.

[0043] Figure 15 A schematic structural view of the conical ring-shaped filter cake pushing ring of the present invention.

[0044] In the figure: 1, support; 2, concentrated liquid discharge section; 03, annular filter frame; 3, filter disc; 4, scraper assembly; 5, backwashing liquid inlet; 6, feed inlet; 07, screw ring; 7, screw nut assembly; 8, upper end cover; 9, double-end mechanical seal device; 10, bearing box; 11, coupling; 12, speed reducer; 13, motor; 14, main shaft; 15, clear liquid outlet; 16, lower end cover; 17, feed section; 18, concentrated liquid outlet; 19, filter disc filtering surface; 20, sliding bearing sleeve; 41, scraper sleeve; 42, scraper disc; 43, scraper auger box; 44, lower filter cake scraper; 45, upper filter cake scraper; 46, filter cake inlet groove; 47, filter cake auger; 48, auger drive gear ring; 49, auger drive gear; 50, filter cake pushing ring; 51, arc-shaped pushing piece; 52, rack ring groove; 53, pushing ring rack; 54, gear groove; 55, pushing ring gear; 56, scraper adjustment groove; 57, scraper adjustment block; 58, scraper adjustment screw; 59, internal hexagonal screw head. Detailed implementation manners

[0045] Next, the embodiments of the present invention will be described in detail with reference to the appended Figures 1 - 15 description.

[0046] A multifunctional stacked concentrator filter, as shown in the appended Figures 1 - 8 figure, includes a support 1, an upper end cover 8, and a lower end cover 16. The bottom of the support 1 can be installed on a pallet chassis, and the pallet chassis is fixedly installed on the ground. The top of the support 1 is fixedly installed with the lower end cover 16. A funnel-shaped concentrated liquid discharge section 2 is penetrated and fixedly installed in the middle of the bottom surface of the lower end cover 16. The top of the lower end cover 16 is installed with a plurality of annular filter frames 03 stacked on top of each other. The bottom of the upper end cover 8 is fixedly installed with an annular feed section 17, and the bottom of the feed section 17 is placed on the top of the uppermost annular filter frame 03;

[0047] A feed inlet 6 is installed on the side wall of the feed section 17. An annular filter disc 3 is installed on the inner side surface of each annular filter frame 03. The inside of the filter disc 3 is hollow, and both the upper and lower layers are filter disc filter surfaces 19. On the outer wall of each annular filter frame 03, a clarified liquid outlet 15 and a backwash liquid inlet 5, which are communicated with the inside of the filter disc 3 and are symmetrically positioned, are fixedly installed. The slurry can flow through all the filter disc filter surfaces 19 in series. The filter disc filter surfaces 19 can filter the solid particles in the slurry so that the clarified liquid in the slurry enters the inside of the filter disc 3, and the filtered solid particles gradually form a filter cake with a certain thickness on the surface of the filter disc filter surfaces 19. The clarified liquid inside each filter disc 3 can flow out from the clarified liquid outlet 15, and after being collected, it is transported to the product refining system. The filtered solid particles flow with the slurry to the concentrated liquid discharge section 2, so as to discharge the concentrated slurry and return it to the reaction system for reuse;

[0048] The backwash liquid inlet 5 can pump the backwashing liquid into the inside of the filter disc 3 and pass through each filter disc filter surface 19 from the inside of the filter disc 3 to the outside in the reverse direction, so as to realize the backwashing regeneration of the filter disc filter surfaces 19. The filter cake washed away by the backwash liquid flows to the concentrated liquid discharge section 2 and is discharged from the concentrated liquid outlet 18 and flows to the waste catalyst storage tank of the system;

[0049] A main shaft 14 is rotatably installed in the middle of the upper end cover 8. A plurality of scraper assemblies 4, which are respectively arranged between every two filter discs 3 and have a spacing from the two filter discs 3, are installed on the outer side surface of the main shaft 14. The scraper assemblies 4 rotate together with the main shaft 14. There is a certain spacing between the scraper assemblies 4 and the filter disc filter surfaces 19. During the rotation of the scraper assemblies 4, the filter cake formed on the surface of the filter disc 3 can be continuously scraped off, and the thickness of the filter cake layer on the filter disc filter surfaces 19 can be dynamically limited, so that the filter cake always maintains a certain thickness, and a new filter cake is continuously formed during the filtration to complete the continuous update of the filter cake layer. In this way, the growth of the filtration resistance can be greatly delayed, and a longer filtration working cycle can be obtained.

[0050] As shown in the Figures 1 - 5 drawing, it further includes a double mechanical seal device 9, a bearing box 10, a coupling 11, a speed reducer 12, and a motor 13. The main shaft 14 is suspended in the bearing box 10. At least two tapered roller bearings are installed in the bearing box 10 in a face-to-face manner to support the axial force of the main shaft 14, and at least two cylindrical roller bearings are installed to bear the radial force of the main shaft 14, so that the main shaft 14 can rotate stably;

[0051] The double mechanical seal device 9 seals the main shaft 14. A single assembled double mechanical seal device 9 is used for sealing. This sealing device can ensure zero leakage of the medium in the equipment, and a special isolation liquid auxiliary system is used to provide circulating isolation liquid for the double mechanical seal device 9 to lubricate, cool the mechanical seal and isolate the medium;

[0052] A sliding bearing sleeve 20 is fixedly installed inside the concentrated liquid discharge section 2. The main shaft 14 passes through the middle parts of multiple filter discs 3 and is installed inside the sliding bearing sleeve 20. The motor 13 and the speed reducer 12 are directly connected and the main shaft 14 is connected through a coupling 11. The motor 13 is driven by a dedicated frequency converter, and the rotation speed of its main shaft 14 can be conveniently adjusted. Different dynamic update frequencies of the filter cake layer can be obtained according to different main shaft speeds, so that the laminated concentrated filter can obtain the best performance under different working conditions;

[0053] A concentrated liquid outlet 18 is arranged at the bottom of the concentrated liquid discharge section 2, which is used to discharge the concentrated slurry and the backwashing liquid to the system.

[0054] As shown in the attached Figure 3 、 Figure 4 As shown, screw rings 07 are fixedly installed on the outer walls of multiple annular filter frames 03. The upper end cover 8 and the lower end cover 16 are tensioned and fixed by a screw nut assembly 7 passing through multiple screw rings 07. Axial seals are adopted between the lower end cover 16, multiple annular filter frames 03 and the feed section 17. The sealing rings make the adjacent two sealing surfaces squeeze and seal through the tension of the screw nut assembly 7. The sealing rings are made of high-temperature resistant and corrosion-resistant materials, preferably made of perfluoroether rubber.

[0055] The filter disc filtering surface 19 is a multi-layer metal sintered layer structure. The multi-layer metal sintered layer can be a multi-layer metal sintered mesh, or a metal porous sintered material, or a filter medium integrally sintered by a metal punching plate and a multi-layer metal mesh. The minimum filtering pore diameter of the filter medium is less than 80% of the particle size of more than 80% of the solid particles. The filter cake is formed on the surface of the filter disc filtering surface 19 by these more than 80% of the solid particles, and then the filter cake layer filters the solid particles with smaller particle sizes, so that the solid content of the final clear liquid is less than 1 ppm.

[0056] The distance between the scraper assembly 4 and the two filter discs 3 above and below it is 3 - 6 mm, so as to keep a certain thickness of the filter cake layer.

[0057] All metal materials in contact with the medium are made of temperature-resistant and corrosion-resistant metal materials, preferably 304 stainless steel and 2205 duplex stainless steel.

[0058] As shown in the attached Figures 11 - 15 As shown, the scraper assembly 4 includes a scraper sleeve 41, a scraper disc 42, a scraper auger box 43, a lower layer filter cake scraper 44, an upper layer filter cake scraper 45, a filter cake inlet groove 46, a filter cake auger 47, an auger drive gear ring 48, and an auger drive gear 49;

[0059] The scraper sleeve 41 is fixedly installed on the outer side of the main shaft 14 and rotates with the main shaft 14. A scraper disc 42 is installed on the outer side of the scraper sleeve 41. The scraper disc 42 can rotate synchronously with the scraper sleeve 41. A plurality of scraper auger boxes 43 with open bottoms are fixedly installed on the outer side surface of the scraper disc 42. The scraper auger boxes 43 are located between two filter discs 3 and have a spacing with a specified filter cake thickness from the two filter discs 3. A lower layer filter cake scraper 44 is fixedly installed at the bottom end of the side surface of the scraper auger box 43 facing its rotation direction, which can scrape the filter cake below it. An upper layer filter cake scraper 45 is fixedly installed at the top of the scraper auger box 43, which can scrape the filter cake above it. A filter cake inlet groove 46 located above the lower layer filter cake scraper 44 penetrates through the side surface of the scraper auger box 43. A filter cake auger 47 is rotatably installed in the scraper auger box 43. A auger drive gear ring 48 is fixedly installed at the top of each filter disc 3. One end of each filter cake auger 47 away from the scraper disc 42 extends out of the scraper auger box 43 and is coaxially fixedly installed with an auger drive gear 49 meshing with the auger drive gear ring 48;

[0060] In order to prevent the scraped filter cake from remaining on the filter disc 3, when the scraper disc 42 drives a plurality of scraper auger boxes 43 to rotate circumferentially, the scraped filter cake can enter the inside of the scraper auger box 43 from the filter cake inlet groove 46. At the same time, the scraper auger box 43 drives the auger drive gear 49 to rotate circumferentially, so that the auger drive gear 49 meshes with the auger drive gear ring 48 and rotates, thereby driving the filter cake auger 47 to rotate. The filter cake auger 47 can quickly move the filter cake entering the scraper auger box 43 towards the center of the filter disc 3, so that the filter cake falls downward, avoiding the filter cake remaining on the surface of the filter disc 3.

[0061] As shown in the attached Figures 11 - 13 figure, a filter cake dial ring 50 is rotatably installed coaxially on the top surface of the scraper disc 42. The filter cake dial ring 50 is in a circular ring shape, and a plurality of arc-shaped dial pieces 51 evenly distributed circumferentially are fixedly installed on its outer side surface. When the scraped filter cake falls downward from the center ring of the filter disc 3, the filter cake will fall onto the top surface of the lower scraper disc 42. In order to prevent the filter cake from remaining on the scraper disc 42, the filter cake dial ring 50 can be rotated to drive a plurality of arc-shaped dial pieces 51 to rotate circumferentially, thereby dialing the filter cake falling onto the scraper disc 42 to the top surface of the next lower filter disc 3, and then being moved by the filter cake auger 47 above the next lower filter disc 3 to the top of the next lower scraper disc 42 until the filter cake enters the concentrated liquid discharge section 2;

[0062] A rack ring groove 52 is formed at the bottom of the filter cake shifting ring 50, and a shifting ring rack 53 is fixedly installed in the rack ring groove 52. A gear groove 54 runs through between the top surface and the bottom surface of the scraper disc 42. One end of the filter cake auger 47 close to the scraper disc 42 penetrates into the gear groove 54 and is coaxially and fixedly installed with a shifting ring gear 55 meshing with the shifting ring rack 53. When the scraper disc 42 drives a plurality of scraper auger boxes 43 to rotate axially, the auger drive gear 49 drives the filter cake auger 47 to rotate. The filter cake auger 47 then drives the shifting ring gear 55 to rotate. The shifting ring gear 55 meshes with the shifting ring rack 53 for transmission, thereby driving the filter cake shifting ring 50 to rotate on the top of the scraper disc 42, so as to shift the filter cake residue on the top of the scraper disc 42.

[0063] As shown in the Figure 15 accompanying drawings, the filter cake shifting ring 50 is a conical ring and has the same outer diameter as the scraper disc 42. A plurality of the arc-shaped blades 51 are evenly distributed on its conical surface in a circumferential manner. After the filter cake drops onto the conical surface of the filter cake shifting ring 50, it can continue to move under the drive of the slurry and will not remain on the conical surface.

[0064] As shown in the Figure 13 accompanying drawings, the scraper disc 42 is sleeved and installed on the outside of the scraper sleeve 41. A scraper adjustment groove 56 is formed on the outer side surface of the scraper sleeve 41. A scraper adjustment block 57 located inside the scraper adjustment groove 56 is fixedly connected to the inner side surface of the scraper disc 42. A scraper adjustment screw 58 threadedly engaged with the scraper adjustment block 57 is rotatably installed between the top surface and the bottom surface of the scraper adjustment groove 56. A screw counterbore is formed on the top surface of the scraper sleeve 41. The top end of the scraper adjustment screw 58 penetrates into the screw counterbore and is connected with an internal hexagonal screw head 59. Rotating the internal hexagonal screw head 59 can drive the scraper adjustment screw 58 to rotate, thereby driving the scraper adjustment block 57 to move up and down. The scraper adjustment block 57 then drives the scraper disc 42 to move up and down, so as to adjust the distance between the scraper assembly 4 and the filter disc 3.

[0065] A method for using a multi-functional stacked concentrator filter for slurry concentration is characterized in that the steps are as follows:

[0066] a. The slurry containing the catalyst enters the feed section 17 from the feed port 6 and flows parallel through the filter disc filter surfaces 19 of each filter disc 3 in series;

[0067] b. When the slurry flows parallel through the filter disc filter surface 19, under the push of the pressure energy, part of the liquid respectively passes through the filter disc filter surface 19 to reach the internal space of each filter disc 3, and then flows out from the clear liquid outlet 15 connected to the filter disc 3. After the clear liquid flowing out from each clear liquid outlet 15 is collected, it is transported to the product refining system;

[0068] c. Some solid particulate matters such as catalysts entrained in the slurry are intercepted by the filter surface 19 of the filter disc and form a filter cake on the surface. After the slurry is taken out of the clear liquid by each filter disc 3, the concentrated liquid enters the concentrated liquid discharge section 2 and finally discharges from the concentrated liquid outlet 18 and returns to the reaction system for reuse.

[0069] d. The backwash liquid enters the interior of each filter disc 3 from each backwash liquid inlet 5 and passes through the filter surface 19 of each filter disc from the inside to the outside in the reverse direction to perform backwashing and regeneration on the filter surface 19 of the filter disc. The filter cake washed away by the backwash liquid is discharged from the concentrated liquid outlet 18 to the waste catalyst storage tank of the system.

[0070] Appendix Figure 9 It is a schematic diagram of the working principle of the stacked type concentration filter. The arrows in it represent the flow directions of the catalyst-containing slurry, the filtrate, the concentrated catalyst, the backwash liquid, and the waste liquid after backwashing in the stacked type concentration filter. The working principle of the stacked type concentration filter of the present invention is as follows:

[0071] The original slurry enters the filter from the feed inlet 6. Due to the blockage of the scraper disc 42, the original slurry flows along the dotted line in the figure parallel to the filter surface 19 of the filter disc, respectively flowing through the surfaces of each scraper disc 42 and the filter disc 3. Under the action of the fluid pressure, part of the liquid vertically passes through the filter surface 19 on the upper and lower sides of the filter disc 3 and enters the interior of the filter disc 3. The entrained solid particulate matters are intercepted by the filter surface 19 of the filter disc and remain on the outer surface of the filter surface 19 of the filter disc to form a filter cake. The filtrate entering the interior of the filter disc 3 flows out from the clear liquid outlet 15 on the side of each filter disc 3 and is collected and output outward as the filtrate. During the flow of the mixed liquid along the dotted line, after each filter disc 3 extracts the clear liquid, it is continuously concentrated, and finally the concentrated liquid flows out from the lower concentrated liquid outlet 18.

[0072] When the feed flow rate is constant, by controlling the flow rate of the filtrate through the regulating valve at the clear liquid outlet 15, the concentration value at the concentrated liquid outlet can be controlled. The rotation of the scraper assembly 4 can scrape, thin, and continuously update the filter cake layer on the surface of each filter disc 3, greatly improving the filtration efficiency, and at the same time, the filtration resistance can be maintained within a low resistance range for a long time.

[0073] The backwash liquid (the filtrate can be collected from the clear liquid outlet 15 as the backwash liquid or desalted water can be used as the backwash liquid) enters the interior of the filter disc 3 through the backwash liquid inlet 5 and performs backwashing on the filter disc 3 by passing through the filter surface 19 of the filter disc in the reverse direction. The pressure of the backwash liquid shall not be greater than 0.1 MPa, otherwise irreversible damage will be caused to the filter disc. The backwash liquid entraining the filter cake finally flows out from the concentrated liquid outlet 18. The mixed liquid with the filter cake after backwashing can enter the waste catalyst storage tank. To achieve the maximum backwashing effect, a valve is installed at the backwash liquid inlet 5 of each filter disc 3, and the filter disc 3 can be individually backwashed in separate plates.

[0074] After all the filter discs 3 of the device have been backwashed, the valve at the clear liquid outlet 15 can be closed, and the valve at the feed inlet 6 can be opened. The stock slurry is used to flush the filter cake on the surface of the filter disc filtration surface 19 in parallel. Finally, the stock slurry flows out from the concentrated liquid outlet 18. This is the normal washing process. After the device completes its offline cleaning, the filtering capacity of the device can be quickly restored.

[0075] Valves and pipeline sight glasses are separately installed at the clear liquid outlet 15 of each filter disc 3. When a certain filter disc 3 is accidentally damaged, only need to observe through the pipeline sight glass and then separately close the valve corresponding to the damaged filter disc 3, then the damaged filter disc 3 can be cut out, enabling the device to maintain normal operation without shutting down, and there is no need to cut the device out of the system for maintenance temporarily.

[0076] Appendix Figure 10 It is a schematic diagram of the working principle of the application of the stacked type concentration filter in the material continuous concentration and filtration system. This process is for the continuous concentration of the material, extracting the clear liquid (replacing the slurry thickener and the concentration filter), and the concentrated liquid is returned to the reactor to continue participating in the reaction:

[0077] The stock slurry passes through the flow metering and control and then enters the top space of the device through the N1a and N1b ports of the device respectively. Due to the separation of the scraper disc, the stock slurry flows parallel to the surface of the filter disc filtration surface. Driven by pressure, it starts from the filter disc at the top of the device alternately, flows through all the filter disc filtration surfaces to reach the concentrated liquid outlet at the bottom of the device. During this process, under the push of pressure, part of the liquid vertically passes through the filter disc filtration surface and enters the inside of the filter disc, flows into the filter frame from the outer edge of the filter disc and flows out from the clear liquid outlet on the side of the filter frame. Part of the catalyst particles are intercepted by the filter disc filtration surface and form a filter cake on the surface. The main shaft drives the scraper disc to rotate at a certain speed, and the scraper assembly scrapes and thins the filter cake layer on the surface of the filter disc to maintain the operation of the filter in a low resistance state.

[0078] The clarified liquid flows out from each clear liquid outlet, passes through each valve and pipeline sight glass, enters the clarified liquid collecting pipe, and then flows out from the N2 port of the device. Since each filter disc is individually controlled by its own valve, when a certain filter disc has catalyst entrained and flowing out due to accidental damage, the position of the damaged filter disc can be judged through the pipeline sight glass at each clear liquid outlet, and closing the corresponding outlet valve can maintain the normal operation of the device without affecting production.

[0079] After the clear liquid flows out from the N2 port, it can be metered by a flow meter and its flow rate can be controlled to meet the requirements of the production process. Finally, the clear liquid flows out after being filtered again by the security filter and enters the next process for production. After the concentrated liquid flows out from the N3 of the device, it also passes through flow metering and then flows back to the upstream reactor to continue participating in the reaction.

[0080] In the initial stage of equipment use, since the filter cake layer has not yet formed and the filtration accuracy of the equipment has not reached the maximum effect, turbid liquid will flow out of the clarified liquid for a period of time. At this time, the valve for the clarified liquid to flow into the security filter can be closed, and the valve leading to the circulation pipeline can be opened to circulate and filter the clarified liquid. After the filter cake layer forms on the filter surface of the equipment filter disc, the clarified liquid can reach the cleanliness required by the process. At this time, the valve for the clarified liquid to flow into the security filter can be opened, and the valve leading to the circulation pipeline can be closed to enable the system to output the clarified liquid to the downstream of the process.

[0081] As the filtration working time extends, it is inevitable that the filtration resistance of the equipment will continuously increase. When the pressure difference between the inlet pressure PIT002 of the slurry stock solution and the outlet pressure PIT005 of the clarified liquid reaches the process set value, the equipment can be temporarily taken out of the system for off-line self-cleaning.

[0082] The self-cleaning is divided into backwashing and normal washing. Close the inlet valve of the slurry stock solution and the outlet valve of the clarified liquid of the equipment, switch the valve to make the outlet of the equipment's concentrated liquid flow to the waste catalyst storage tank, open the valve of the backwashing liquid inlet, and sequentially open the valves of the backwashing liquid shunt pipes leading to each filter disc to make the backwashing liquid flow into the corresponding filter disc interior respectively. The backwashing liquid passes through the filter surface of the filter disc from the inside to the outside to wash off the filter cake on its surface. The backwashing pressure of the backwashing liquid shall not be greater than 0.1 MPa (guaranteed by the safety valve on the backwashing pipeline). The mixed liquid washed out by the backwashing flows through the outlet of the equipment's concentrated liquid to the waste catalyst storage tank.

[0083] After all the filter discs have completed backwashing, the equipment can be normally washed. At this time, close the valves on the backwashing liquid pipeline, keep the outlet of the equipment's concentrated liquid connected to the waste catalyst storage tank, open the inlet valve of the slurry stock solution, and make the slurry stock solution pass through the surface of the filter surface of each filter disc in a parallel flow manner to wash the residual filter cake on its surface. The mixed liquid flows through the outlet of the concentrated liquid to the waste catalyst storage tank. When the normal washing time of the equipment reaches the process set time, the equipment completes its off-line cleaning process and has restored its filtration capacity.

[0084] At this time, the valves on the pipeline can be switched to connect the outlet of the equipment's concentrated liquid to the path in the normal working state of the equipment. Open the valve of the equipment's clear liquid outlet, and at the same time switch the flow direction of the clarified liquid flowing to the security filter to the circulation filtration state. After the cleanliness requirement of the clarified liquid output reaches the process requirement, switch back to the normal filtration working state to complete the formal re-use of the equipment. The off-line cleaning process always keeps the main shaft of the equipment running without stopping, and there is no need to disassemble the equipment.

[0085] When the filter disc filtration surface is blocked by numerous solid particles in the middle and cannot quickly restore its filtration capacity through backwashing and normal washing for self-cleaning, the device can be disassembled to take out the filter disc, and then disassemble the filter disc to take out the filtration unit with the smallest structure (the filter disc filtration surface). It can be repeatedly rinsed on both sides with a high-pressure water gun or chemically cleaned. It can also be calcined in an oxygen-free state to incinerate the solid particles therein. Finally, the filter disc filtration surface can restore its filtration capacity. Of course, it is also possible to directly replace the filter disc filtration surface.

[0086] Through tests and calculations, the filtrate output of one unit of this device (25 m²) is roughly equivalent to that of 2 - 3 units of traditional slurry thickeners (40 m²). The specific output can also be adjusted according to the working status of their respective systems and process requirements.

[0087] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0088] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "joined" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0089] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A multi-functional stacked concentration filter, comprising a bracket (1), an upper end cover (8), and a lower end cover (16), characterized in that, A lower end cover (16) is fixedly installed at the top of the bracket (1). In the middle of the bottom surface of the lower end cover (16), a concentrated liquid discharge section (2) is penetrated and fixedly installed. At the top of the lower end cover (16), a plurality of annular filter frames (03) are stacked and placed. At the bottom of the upper end cover (8), an annular feed section (17) is fixedly installed. The bottom of the feed section (17) is placed on the top of the uppermost annular filter frame (03). A feed port (6) is installed on the side wall of the feed section (17). An annular filter disc (3) is installed on the inner side surface of each annular filter frame (03). The inside of the filter disc (3) is hollow, and both the upper and lower layers are filter disc filter surfaces (19). On the outer wall of each annular filter frame (03), a clear liquid outlet (15) and a backwash liquid inlet (5) which are communicated with the inside of the filter disc (3) and are symmetrically positioned are fixedly installed. In the middle of the upper end cover (8), a main shaft (14) is rotatably installed. On the outer side surface of the main shaft (14), a plurality of scraper assemblies (4) which are respectively located between every two filter discs (3) and have a spacing from the two filter discs (3) are installed; The scraper assembly (4) includes a scraper sleeve (41), a scraper disc (42), a scraper auger box (43), a lower layer filter cake scraper (44), an upper layer filter cake scraper (45), a filter cake inlet groove (46), a filter cake auger (47), an auger drive gear ring (48), and an auger drive gear (49); The scraper sleeve (41) is fixedly installed on the outer side of the main shaft (14). A scraper disc (42) is installed on the outer side of the scraper sleeve (41). On the outer side surface of the scraper disc (42), a plurality of scraper auger boxes (43) with open bottoms are fixedly installed. At the bottom end of the side surface of the scraper auger box (43) facing its rotation direction, a lower layer filter cake scraper (44) is fixedly installed. At the top of the scraper auger box (43), an upper layer filter cake scraper (45) is fixedly installed. A filter cake inlet groove (46) located above the lower layer filter cake scraper (44) penetrates through the side surface of the scraper auger box (43). A filter cake auger (47) is rotatably installed in the scraper auger box (43). At the top of each filter disc (3), an auger drive gear ring (48) is fixedly installed. At one end of each filter cake auger (47) away from the scraper disc (42), it extends out of the scraper auger box (43) and is coaxially fixedly installed with an auger drive gear (49) meshing with the auger drive gear ring (48); On the top surface of the scraper disc (42), a filter cake dial ring (50) is coaxially rotatably installed. The filter cake dial ring (50) is in a circular ring shape, and a plurality of arc-shaped dial pieces (51) evenly distributed in the circumferential direction are fixedly installed on its outer side surface. A rack ring groove (52) is formed at the bottom of the filter cake dial ring (50). A dial ring rack (53) is fixedly installed in the rack ring groove (52). A gear groove (54) penetrates between the top surface and the bottom surface of the scraper disc (42). At one end of the filter cake auger (47) close to the scraper disc (42), it penetrates into the gear groove (54) and is coaxially fixedly installed with a dial ring gear (55) meshing with the dial ring rack (53); The filter cake shifting ring (50) is a conical ring and has the same outer diameter as the scraper disc (42), and a plurality of the arc-shaped shifting pieces (51) are evenly distributed on its conical surface in a circumferential manner; The scraper disc (42) is sleeved and installed on the outer side of the scraper sleeve (41). A scraper adjusting groove (56) is formed on the outer side surface of the scraper sleeve (41). A scraper adjusting block (57) located inside the scraper adjusting groove (56) is fixedly connected to the inner side surface of the scraper disc (42). A scraper adjusting screw (58) that is in threaded cooperation with the scraper adjusting block (57) is rotatably installed between the top surface and the bottom surface of the scraper adjusting groove (56). A screw counterbore is formed on the top surface of the scraper sleeve (41). The top end of the scraper adjusting screw (58) penetrates into the screw counterbore and is connected with an internal hexagonal screw head (59).

2. The multifunctional stacked concentration filter according to claim 1, wherein It further includes a double-end mechanical seal device (9), a bearing box (10), a coupling (11), a speed reducer (12), and a motor (13). The main shaft (14) is suspended in the bearing box (10). The double-end mechanical seal device (9) seals the main shaft (14). A sliding bearing sleeve (20) is fixedly installed inside the concentrated liquid discharging section (2). The main shaft (14) passes through the middle parts of a plurality of filter discs (3) and is installed inside the sliding bearing sleeve (20). The motor (13) and the speed reducer (12) are directly connected and are connected to the main shaft (14) through the coupling (11). A concentrated liquid outlet (18) is arranged at the bottom of the concentrated liquid discharging section (2).

3. A multifunctional stacked concentration filter according to claim 1, characterized in that, Screw rings (07) are fixedly installed on the outer walls of a plurality of the annular filter frames (03). The upper end cover (8) and the lower end cover (16) are tensioned and fixed through screw nut assemblies (7) that pass through a plurality of the screw rings (07).

4. A multifunctional laminated concentration filter according to claim 1, characterized in that The filter disc filtering surface (19) is a multi-layer metal sintered layer structure.

5. A multifunctional laminated concentration filter according to claim 1, characterized in that, The distance between the scraper assembly (4) and the two filter discs (3) located above and below it is 3 - 6 mm.

6. A method for slurry concentration using a multi-functional laminated concentration filter according to any one of claims 1-5, characterized in that, The steps are as follows: a. The slurry containing the catalyst enters the feeding section (17) from the feeding port (6) and flows parallel through the filter disc filtering surfaces (19) of each filter disc (3) in series; b. When the slurry flows through the filter disc filtering surfaces (19) in parallel, under the push of the pressure energy, part of the liquid respectively passes through the filter disc filtering surfaces (19) to reach the internal spaces of each filter disc (3), and then flows out from the clear liquid outlets (15) connected to the filter discs (3). After the clear liquid flowing out from each clear liquid outlet (15) is collected, it is transported to the product refining system; c. The catalyst solid particles entrained by the slurry are partially intercepted by the filter disc filtering surfaces (19) and form filter cakes on the surfaces. After the slurry is extracted with clear liquid by each filter disc (3), it forms concentrated liquid and enters the concentrated liquid discharging section (2), and finally is discharged from the concentrated liquid outlet (18) and returned to the reaction system for reuse; d. The backwashing liquid enters the interiors of each filter disc (3) from each backwashing liquid inlet (5), and passes through each filter disc filtering surface (19) in a reverse direction from the inside to the outside to perform backwashing regeneration on the filter disc filtering surfaces (19). The filter cakes washed away by the backwashing liquid are discharged from the concentrated liquid outlet (18) to the waste catalyst storage tank of the system.

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