Multifunctional laminated concentration filter

Abstract

The invention relates to the field of concentration filters, in particular to a multifunctional stacked concentration filter which comprises a support, an upper end cover and a lower end cover, a concentrated solution discharging section is mounted in the middle of the lower end cover, a plurality of stacked annular filter frames are mounted at the top of the lower end cover, a feeding section is mounted at the bottom of the upper end cover, and the bottom of the feeding section is arranged at the tops of the annular filter frames. A feeding opening is formed in the side wall of the feeding section, a filter disc is installed on the inner side face of the annular filter frame, the interior of the filter disc is hollow, the upper layer and the lower layer of the filter disc are filter disc filter faces, and a clear liquid outlet and a backwashing liquid inlet which are symmetrical in position are formed in the outer wall of the annular filter frame; scraper assemblies which are arranged between every two filter discs and are spaced from the two filter discs are installed on the outer side face of the main shaft. According to the invention, a dynamic cross-flow filtering mode is adopted, so that fluid flows through the filtering surfaces of all the filtering discs in a series connection mode, continuous solid-liquid separation of liquid and solid particles is realized, and a catalyst is recycled, so that relatively high concentration efficiency is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of concentration filters, in particular to a multifunctional stacked concentration filter. Background Art

[0002] Liquid phase hydrogenation reactions are used in many chemical production processes (such as TDI production). Catalysts are usually added to the reaction 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 installed outside the reactor, and the concentrated catalyst slurry is returned to the reactor for recycling, and the clear liquid is extracted to make the reactants meet the requirements of downstream processes. Since the particle size of the catalysts usually used is small, it is a difficult problem to separate the catalyst slurry from the reactants and make the clear liquid extracted by the equipment clean enough to meet the requirements of downstream processes.

[0003] At present, the domestic equipment to solve this problem is a foreign monopoly product, which is expensive, has high maintenance costs and high energy consumption. Since it uses hydraulic transmission to drive the main shaft to rotate, the complexity of the hydraulic system makes it low in reliability, high in failure rate, and high in energy loss, resulting in its transmission efficiency of only about 60%. Taking the foreign monopoly equipment with a filtration area of ​​40 square meters as an example, its driving motor power is 55KW. Since the clear liquid is produced in parallel, each slurry only flows through the surface of two filter layers, the amount of clear liquid produced is small, and the concentration efficiency is low. One of the above equipment can only process about 40m3 / hr of slurry, and the clear liquid produced is only about 4.5m3 / hr, and the concentration efficiency is only 2.25%, which is inefficient.

[0004] At present, in the domestic related chemical industry, there is an urgent need for a concentration filter that can break the foreign monopoly, greatly improve the filtration efficiency and performance, and reduce energy consumption, investment costs and operating costs. Therefore, the present invention provides a multifunctional stacked concentration filter to solve the above problems. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a multifunctional stacked concentration filter to solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A multifunctional stacked concentration filter comprises a bracket, an upper end cover and a lower end cover, the top of the bracket is fixedly mounted with the lower end cover, the middle part of the bottom surface of the lower end cover is penetrated and fixedly mounted with a concentrated liquid discharge section, the top of the lower end cover is mounted with a plurality of stacked annular filter frames, the bottom of the upper end cover is fixedly mounted 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 mounted on the side wall of the feed section, an annular filter disc is mounted on the inner side surface of each of the annular filter frames, the interior of the filter disc is hollow, and the upper and lower layers are both filter surfaces of the filter disc, a clear liquid outlet and a backwash liquid inlet which are symmetrically connected to the interior of the filter disc are fixedly mounted on the outer wall of each of the annular filter frames, a main shaft is rotatably mounted in the middle part of the upper end cover, and a plurality of scraper assemblies which are respectively placed between each two filter discs and have a spacing with the two filter discs are mounted on the outer side surface of the main shaft.

[0007] Preferably, it also includes a double-end mechanical seal device, a bearing box, a coupling, a reducer, and an electric 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 multiple filter discs and is installed in the sliding bearing sleeve. The motor and the reducer are directly connected and connected to the main shaft through a coupling. A concentrated liquid outlet is provided at the bottom of the concentrated liquid discharge section.

[0008] Preferably, screw rings are fixedly mounted on the outer walls of the plurality of annular filter frames, and the upper end cover and the lower end cover are tightened and fixed by a screw nut assembly passing through the plurality of screw rings.

[0009] Preferably, the filter surface of the filter disc is a multi-layer metal sintered layer structure.

[0010] Preferably, the distance between the scraper assembly and the two filter discs above and below it is 3-6 mm.

[0011] Preferably, the scraper assembly includes a scraper sleeve, a scraper disc, a scraper auger box, a lower filter cake scraper, an upper filter cake scraper, a filter cake inlet groove, a filter cake auger, an auger drive gear ring, and an auger drive gear; The scraper sleeve is fixedly mounted on the outside of the main shaft, and a scraper disc is mounted on the outside of the scraper sleeve, and a plurality of scraper auger boxes with bottom openings are fixedly mounted on the outer surface of the scraper disc, and a lower filter cake scraper is fixedly mounted on the bottom end of the side of the scraper auger box facing its rotation direction, and an upper filter cake scraper is fixedly mounted on the top of the scraper auger box, and a filter cake entry groove located above the lower filter cake scraper is penetrated on the side of the scraper auger box, and a filter cake auger is rotatably mounted in the scraper auger box, and an auger drive gear ring is fixedly mounted on the top of each filter disc, and the end of each filter cake auger away from the scraper disc extends out of the scraper auger box, and an auger drive gear meshing with the auger drive gear ring is coaxially fixedly mounted.

[0012] Preferably, a filter cake shifting ring is coaxially rotatably installed on the top surface of the scraper disk, the filter cake shifting ring is in a circular ring shape, and a plurality of arc-shaped shifting pieces evenly distributed around the circumference are fixedly installed on its outer surface, a rack ring groove is provided at the bottom of the filter cake shifting ring, a shifting ring rack is fixedly installed in the rack ring groove, a gear groove passes through the top surface of the scraper disk and the ground, one end of the filter cake auger close to the scraper disk passes through the gear groove, and a shifting ring gear meshing with the shifting ring rack is coaxially fixedly installed.

[0013] Preferably, the filter cake shifting ring is a conical ring, and its outer diameter is the same as that of the scraper disk, and a plurality of arc-shaped shifting pieces are evenly distributed on its conical surface.

[0014] Preferably, the scraper disc sleeve is installed on the outside of the scraper sleeve, the outer side surface of the scraper sleeve is provided with a scraper adjustment groove, the inner side surface of the scraper disc is fixedly connected with a scraper adjustment block located inside the scraper adjustment groove, a scraper adjustment screw that cooperates with the scraper adjustment block thread is rotatably installed between the top and bottom surfaces of the scraper adjustment groove, a screw countersunk hole is provided on the top surface of the scraper sleeve, the top end of the scraper adjustment screw passes through the screw countersunk hole and is connected with a hexagonal screw head.

[0015] A method for using a multifunctional stacked concentration filter for slurry concentration, characterized in that the steps are: a. The slurry containing the catalyst enters the feed section from the feed port and flows through the filter surfaces of each filter disc in parallel in a series manner; b. When the slurry flows in parallel on the filter surface of the filter disc, part of the liquid passes through the filter surface of the filter disc under the pressure energy and reaches the internal space of each filter disc, and then flows out from the clear liquid outlet connected to the filter disc. The clear liquid flowing out from each clear liquid outlet is collected and sent to the product refining system; c. Solid particles such as catalysts carried by the slurry are partially intercepted by the filter surface of the filter disc to form filter cakes. After the clear liquid is extracted from the slurry by each filter disc, it forms a concentrated liquid that enters the concentrated liquid discharge section and is finally discharged from the concentrated liquid outlet and returned to the reaction system for reuse; d. The backwash liquid enters the interior of each filter disc from each backwash liquid inlet, passes through the filter surface of each filter disc from the inside to the outside, and backwashes and regenerates the filter surface of the filter disc. The backwash liquid carries the washed filter cake and flows out from the concentrated liquid outlet to the waste catalyst storage tank of the system.

[0016] The beneficial effects of the present invention are: 1. The stacked concentration filter of the present invention adopts a dynamic cross-flow filtration method, so that the fluid flows through the filter surfaces of all filter discs in series, realizes continuous solid-liquid separation of liquid and solid particles, and recycles the catalyst to obtain a higher concentration efficiency, greatly improves the performance of the equipment, and realizes continuous operation of chemical production. The motor and the reducer are directly connected, and are connected to the main shaft through a coupling, which reduces the intermediate links and makes the transmission efficiency reach more than 95%.

[0017] 2. The stacked concentration filter of the present invention uses a rotating scraper to continuously scrape off the filter cake formed on the filter surface, so that the filter cake layer can be continuously broken and the filter cake layer can be updated in time, which greatly delays the growth of the filtration resistance and makes the filtration working time of the equipment longer.

[0018] 3. When the scraper disc drives multiple scraper auger boxes to rotate circumferentially, the scraped filter cake can enter the interior of the scraper auger box from the filter cake entry groove. At the same time, the scraper auger drives the auger drive gear to rotate circumferentially, so that the auger drive gear and the auger drive gear ring engage and rotate, thereby driving the filter cake auger to rotate. The filter cake auger can quickly move the filter cake entered into the scraper auger box to the center of the filter disc, so that the filter cake falls downward to avoid the filter cake remaining on the surface of the filter disc.

[0019] 4. The stacked concentration filter of the present invention supports off-line backwashing. After the filtration resistance reaches the upper limit value, the present invention can be shut down for backwashing without disassembling the equipment. During backwashing, backwashing liquid is introduced from the backwashing liquid inlet, so that the backwashing liquid can pass through the filter surface of the filter disc from the inside to the outside, and wash off the filter cake layer outside the filter surface to achieve the purpose of backwashing regeneration. Usually, a valve is installed at the backwashing liquid inlet of each filter disc, so that each filter disc can realize single filter disc backwashing respectively to achieve the best backwashing effect.

[0020] 5. The stacked concentrating filter of the present invention can also be forward washed after backwashing. During forward washing, the slurry stock liquid is introduced from the slurry inlet, the valve of the filtrate outlet is closed, and the slurry flows tangentially through the filter surface of each filter disc in an unconcentrated state to wash away the filter cake remaining on the filter surface. The above-mentioned waste liquid after backwashing and the slurry stock liquid after forward washing are discharged from the concentrated liquid outlet. Usually, this liquid is sent to the waste catalyst storage tank of the system for the next step of treatment. After backwashing and forward washing, the filter medium is regenerated and can be put into use in the system again. There is no need to disassemble the equipment to clean the filter disc, which effectively saves the equipment maintenance workload.

[0021] 6. Through the method of continuous slurry concentration and continuous solid-liquid separation provided by the present invention, the purpose of continuously extracting the clear liquid of the reaction product and continuously concentrating the catalyst and returning it to the reaction system for reuse can be achieved. The extracted clear liquid has the catalyst and reaction by-products removed and is sent to the product refining system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention.

[0023] Figure 2 It is a top view of the present invention.

[0024] Figure 3 It is a three-dimensional schematic diagram of the present invention.

[0025] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle.

[0026] Figure 5 It is a cross-sectional view of the present invention.

[0027] Figure 6 It is a cross-sectional schematic diagram of a plurality of filter discs installed in a stacked manner according to the present invention.

[0028] Figure 7 For the present invention Figure 5 Enlarged view of point B in the middle.

[0029] Figure 8 For the present invention Figure 5 Enlarged view of point C in the middle.

[0030] Fig. 9 It is a schematic diagram of the working principle of the present invention.

[0031] Fig.10 The present invention is a flowchart of the process of continuous concentration and filtration of slurry.

[0032] Fig.11 It is a cross-sectional view of the scraper auger box and the filter cake auger of the present invention.

[0033] Fig.12 It is a three-dimensional cross-sectional view of the scraper auger box and the filter cake auger of the present invention.

[0034] Fig.13 For the present invention Fig.12 Enlarged view of point D in the middle.

[0035] Fig.14 It is a schematic structural diagram of the lower filter cake scraper and the upper filter cake scraper of the present invention.

[0036] Fig.15 It is a schematic structural diagram of a conical ring-shaped filter cake shifting ring of the present invention.

[0037] In the figure: 1. bracket; 2. concentrated liquid discharge section; 03. annular filter frame; 3. filter disc; 4. scraper assembly; 5. backwash 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. reducer; 13. motor; 14. main shaft; 15. clear liquid outlet; 16. lower end cover; 17. feed section; 18. concentrated liquid outlet; 19. filter disc filter 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 shift ring; 51, arc-shaped shift piece; 52, rack ring groove; 53, shift ring rack; 54, gear groove; 55, shift ring gear; 56, scraper adjustment groove; 57, scraper adjustment block; 58, scraper adjustment screw; 59, hexagon socket screw head. DETAILED DESCRIPTION

[0038] The following will refer to the attached Figure 1-Figure 15 Description Various embodiments of the present invention are described in detail.

[0039] A multifunctional cascade concentrating filter, such as the attached Figure 1-8 As shown, it includes a bracket 1, an upper end cover 8, and a lower end cover 16. The bottom of the bracket 1 can be installed on a support plate chassis, and the support plate chassis is fixedly installed on the ground. The top of the bracket 1 is fixedly installed with a lower end cover 16, and the middle of the bottom surface of the lower end cover 16 is penetrated and fixedly installed with a funnel-shaped concentrated liquid discharge section 2. The top of the lower end cover 16 is installed with a plurality of stacked annular filter frames 03. 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. A feed port 6 is installed on the side wall of the feed section 17, and an annular filter disc 3 is installed on the inner side surface of each annular filter frame 03. The interior of the filter disc 3 is hollow, and the upper and lower layers are both filter disc filter surfaces 19. The outer wall of each annular filter frame 03 is fixedly installed with a clear liquid outlet 15 and a backwash liquid inlet 5 that are connected to the interior of the filter disc 3 and symmetrically positioned. The slurry can flow through all the filter disc filter surfaces 19 in series. The filter disc filter surfaces 19 can filter solid particles in the slurry, so that the clear liquid in the slurry enters the interior of the filter disc 3, and the filtered solid particles gradually form a filter cake of a certain thickness on the surface of the filter disc filter surface 19. The clear liquid inside each filter disc 3 can flow out from the clear liquid outlet 15 and be collected and then transported to the product refining system, while the filtered solid particles flow with the slurry to the concentrated liquid discharge section 2, so that the concentrated slurry is discharged and returned to the reaction system for reuse; The backwash liquid inlet 5 can pump the backwash liquid into the filter disc 3, and pass through the filter surfaces 19 of each filter disc from the inside of the filter disc 3 to the outside in the reverse direction, thereby realizing the backwash regeneration of the filter surface 19 of the filter disc. The backwash liquid carries the washed filter cake to the concentrated liquid discharge section 2, and is discharged from the concentrated liquid outlet 18 to the waste catalyst storage tank of the system. A main shaft 14 is rotatably installed in the middle of the upper end cover 8, and a plurality of scraper assemblies 4 are installed on the outer surface of the main shaft 14, which are respectively placed between every two filter discs 3 and have a distance from the two filter discs 3. The scraper assembly 4 rotates with the main shaft 14, and there is a certain distance between the scraper assembly 4 and the filtering surface 19 of the filter disc. The scraper assembly 4 can continuously scrape off the filter cake formed on the surface of the filter disc 3 during rotation, and can dynamically limit the thickness of the filter cake layer on the filtering surface 19 of the filter disc, so that the filter cake always maintains a certain thickness, and continuously forms new filter cakes during filtration to complete the continuous renewal of the filter cake layer, which can greatly delay the growth of the filtration resistance, thereby obtaining a longer filtration working cycle.

[0040] As attached Figure 1-Figure 5 As shown, it also includes a double-end mechanical seal device 9, a bearing box 10, a coupling 11, a 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 in the bearing box 10 to bear the radial force of the main shaft 14, so that the main shaft 14 can rotate stably; The double-end mechanical seal device 9 seals the main shaft 14, and a container-type double-end mechanical seal device 9 is used for sealing. The sealing device can ensure zero leakage of the medium in the equipment, and a special isolation liquid auxiliary system is used to provide the double-end mechanical seal device 9 with circulating isolation liquid to lubricate, cool the mechanical seal and isolate the medium; A sliding bearing sleeve 20 is fixedly installed inside the concentrated liquid discharge section 2, and the main shaft 14 passes through the middle of the plurality of filter discs 3 and is installed in the sliding bearing sleeve 20. The motor 13 and the reducer 12 are directly connected and connected to the main shaft 14 through the coupling 11. The motor 13 is driven by a dedicated frequency converter, and the rotation speed of the main shaft 14 can be easily adjusted. Different dynamic update frequencies of the filter cake layer can be obtained according to different main shaft speeds. With this stacked concentrated filter, the best performance can be obtained under different working conditions. A concentrated liquid outlet 18 is provided at the bottom of the concentrated liquid discharge section 2 for discharging concentrated liquid slurry and backwash liquid into the system.

[0041] As attached Figure 3 , Figure 4As shown, screw rings 07 are fixedly installed on the outer walls of the multiple annular filter frames 03, and the upper end cover 8 and the lower end cover 16 are tightened and fixed by a screw nut assembly 7 passing through the multiple screw rings 07. A sealing ring is used for axial sealing between the lower end cover 16, the multiple annular filter frames 03 and the feed section 17. The sealing ring squeezes and seals its two adjacent sealing surfaces through the tightening force of the screw nut assembly 7. The sealing ring is made of high temperature resistant and corrosion resistant material, preferably perfluoroether rubber.

[0042] The filter surface 19 of the filter disc 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 sintered by a metal punching plate and a multi-layer metal mesh. The minimum filter aperture of the filter medium is smaller than the particle size of more than 80% of the solid particles. More than 80% of the solid particles form a filter cake on the surface of the filter surface 19 of the filter disc, and then the filter cake layer is used to filter solid particles with finer particle sizes, so that the solid content of the final clear liquid is less than 1ppm.

[0043] The distance between the scraper assembly 4 and the two filter discs 3 above and below it is 3-6 mm, so that the filter cake layer maintains a certain thickness.

[0044] Metal materials in contact with the medium are all made of heat-resistant and corrosion-resistant metal materials, preferably 304 stainless steel and 2205 duplex stainless steel.

[0045] As attached Figure 11-Figure 15 As shown, the scraper assembly 4 includes a scraper sleeve 41, a scraper disc 42, a scraper auger box 43, a lower filter cake scraper 44, an upper 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 mounted on the outside of the main shaft 14 and rotates with the main shaft 14. A scraper disc 42 is mounted on the outside 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 bottom openings are fixedly mounted on the outer surface of the scraper disc 42. The scraper auger box 43 is located between the two filter discs 3 and has a spacing of a specified filter cake thickness with the two filter discs 3. A lower filter cake scraper 44 is fixedly mounted on the bottom end of the side of the scraper auger box 43 facing its rotation direction, which can scrape the filter cake below it. Scraping: an upper filter cake scraper 45 is fixedly installed on the top of the scraper auger box 43, which can scrape the filter cake above it. A filter cake entry groove 46 located above the lower filter cake scraper 44 is penetrated on the side of the scraper auger box 43. A filter cake auger 47 is rotatably installed in the scraper auger box 43. An auger drive gear ring 48 is fixedly installed on the top of each filter disc 3. The end of each filter cake auger 47 away from the scraper disc 42 extends out of the scraper auger box 43, and an auger drive gear 49 meshing with the auger drive gear ring 48 is coaxially fixedly installed; In order to prevent the scraped filter cake from remaining on the filter disc 3, when the scraper disc 42 drives the multiple scraper auger boxes 43 to rotate circumferentially, the scraped filter cake can enter the interior of the scraper auger box 43 from the filter cake entry groove 46, and 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 engages with the auger drive gear ring 48 to rotate, thereby driving the filter cake auger 47 to rotate, and the filter cake auger 47 can quickly move the filter cake entered into the scraper auger box 43 to the center of the filter disc 3, so that the filter cake falls downward, avoiding the filter cake from remaining on the surface of the filter disc 3.

[0046] As attached Figure 11-13 As shown, a filter cake shifting ring 50 is coaxially rotatably mounted on the top surface of the scraper disc 42. The filter cake shifting ring 50 is annular, and a plurality of arc-shaped shifting pieces 51 evenly distributed around the circumference are fixedly mounted on the outer surface thereof. When the scraped filter cake falls downward from the central ring of the filter disc 3, the filter cake will fall onto the top surface of the scraper disc 42 below. In order to prevent the filter cake from remaining on the scraper disc 42, the filter cake shifting ring 50 can be rotated to drive the plurality of arc-shaped shifting pieces 51 to rotate circumferentially, thereby shifting the filter cake that has fallen onto the scraper disc 42 to the top surface of the filter disc 3 of the next layer, and then being moved to the top of the scraper disc 42 of the next layer by the filter cake auger 47 above the filter disc 3 of the next layer, until the filter cake enters the concentrated liquid discharge section 2; A rack ring groove 52 is provided 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 the top surface of the scraper disk 42 and the ground. The end of the filter cake auger 47 close to the scraper disk 42 passes through the gear groove 54 and is coaxially fixed with a shifting ring gear 55 meshing with the shifting ring rack 53. When the scraper disk 42 drives the multiple scraper auger boxes 43 to rotate axially, the auger driving gear 49 drives the filter cake auger 47 to rotate, and the filter cake auger 47 drives the shifting ring gear 55 to rotate. The shifting ring gear 55 is meshed with the shifting ring rack 53 for transmission, thereby driving the filter cake shifting ring 50 to rotate on the top of the scraper disk 42, thereby shifting the filter cake residue on the top of the scraper disk 42.

[0047] As attached Fig.15 As shown, the filter cake shifting ring 50 is a conical ring, and its outer diameter is the same as that of the scraper disk 42, and a plurality of arc-shaped shifting pieces 51 are evenly distributed on its conical surface. After the filter cake falls onto the conical surface of the filter cake shifting ring 50, it can continue to move driven by the slurry and will not remain on the conical surface.

[0048] As attached Fig.13As shown, the scraper disc 42 is sleeved and installed on the outer side of the scraper sleeve 41, and a scraper adjustment groove 56 is provided 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 threadably matched with the scraper adjustment block 57 is rotatably installed between the top and bottom surfaces of the scraper adjustment groove 56. A screw countersunk hole is provided on the top surface of the scraper sleeve 41, and the top end of the scraper adjustment screw 58 passes through the screw countersunk hole and is connected to a hexagonal screw head 59. Rotating the 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, and the scraper adjustment block 57 drives the scraper disc 42 to move up and down, thereby adjusting the distance between the scraper assembly 4 and the filter disc 3.

[0049] A method for using a multifunctional stacked concentration filter for slurry concentration, characterized in that the steps are: a. The catalyst-containing slurry enters the feed section 17 from the feed port 6 and flows through the filter surfaces 19 of the filter discs 3 in parallel in series; b. When the slurry flows in parallel on the filter surface 19 of the filter disc, part of the liquid passes through the filter surface 19 of the filter disc under the pressure energy and reaches the inner space of each filter disc 3, and then flows out from the clear liquid outlet 15 connected to the filter disc 3, and the clear liquids flowing out from each clear liquid outlet 15 are collected and transported to the product refining system; c. Solid particles such as catalysts carried by the slurry are partially intercepted by the filter surface 19 of the filter disc to form a filter cake. After the clear liquid is extracted from the slurry by each filter disc 3, it forms a concentrated liquid and enters the concentrated liquid discharge section 2. Finally, it is discharged from the concentrated liquid outlet 18 and returned to the reaction system for reuse; d. The backwash liquid enters the interior of each filter disc 3 from each backwash liquid inlet 5, passes through the filter surface 19 of each filter disc from the inside to the outside, and backwashes and regenerates the filter surface 19 of the filter disc. The backwash liquid carries the washed filter cake and flows out from the concentrated liquid outlet 18 to the waste catalyst storage tank of the system.

[0050] Attached Fig. 9 The schematic diagram of the working principle of the stacked concentration filter is shown in FIG. 1 , in which the arrows respectively 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 concentration filter. The working principle of the stacked concentration filter of the present invention is as follows: The slurry stock liquid enters the filter from the feed port 6. Due to the obstruction of the scraper disk 42, the slurry stock liquid flows through each scraper disk 42 and the surface of the filter disk 3 along the dotted line in the figure in parallel to the filter surface 19 of the filter disk. Under the action of the fluid pressure, part of the liquid vertically passes through the filter surfaces 19 on the upper and lower sides of the filter disk 3 and enters the interior of the filter disk 3. The entrained solid particles are intercepted by the filter surface 19 of the filter disk and remain on the outer surface of the filter surface 19 of the filter disk to form a filter cake. The filtrate entering the interior of the filter disk 3 flows out from the clear liquid outlet 15 on the side of each filter disk 3 and is collected to output the filtrate outward. In the process of flowing along the dotted line, the mixed liquid is continuously concentrated after the clear liquid is extracted from each filter disk 3, and finally the concentrated liquid flows out from the concentrated liquid outlet 18 at the bottom. When the feed flow rate is constant, the flow rate of the filtrate can be controlled by the regulating valve of the clear liquid outlet 15, so as to control the concentration value of the concentrated liquid outlet. The rotation of the scraper assembly 4 can scrape off the thinning and continuously renew the filter cake layer on the surface of each filter disc 3, so that the filtration efficiency is greatly improved, and at the same time, the filtration resistance can be maintained in a low resistance range for a long time.

[0051] The backwash liquid (the clear liquid can be collected from the clear liquid outlet 15 and used as the backwash liquid or the desalted water can be used as the backwash liquid) enters the filter disc 3 through the backwash liquid inlet 5, and backwashes the filter disc 3 through the filter surface 19 in the reverse direction. The backwash liquid pressure shall not be greater than 0.1MPa, otherwise it will cause irreversible damage to the filter disc. The backwash liquid carries the filter cake and finally flows out from the concentrated liquid outlet 18. After backwashing, the mixed liquid with the filter cake can enter the waste catalyst storage tank. In order to achieve the maximum backwashing effect, the backwash liquid inlet 5 of each filter disc 3 is installed with a valve, and the filter disc 3 can be backwashed separately; After all the filter discs 3 of the equipment are backwashed, the valve of the clear liquid outlet 15 can be closed, and the valve of the feed inlet 6 can be opened. The slurry stock liquid is used to pass through the surface of the filter disc filter surface 19 in parallel to flush the filter cake on its surface. Finally, the slurry stock liquid flows out from the concentrated liquid outlet 18. This is positive washing. After the equipment completes its offline cleaning, the equipment can quickly restore its filtering capacity.

[0052] A valve and a pipe sight glass are separately installed at the clear liquid outlet 15 of each filter disc 3. When a filter disc 3 is accidentally damaged, it is only necessary to observe through the pipe sight glass and then close the valve corresponding to the damaged filter disc 3 separately to cut out the damaged filter disc 3, so that the equipment can maintain normal operation without stopping the machine, and there is no need to cut the equipment out of the system for maintenance temporarily.

[0053] Attached Fig.10 This is a schematic diagram of the working principle of the stacked concentration filter application and the material continuous concentration filtration system. This process is the continuous concentration of the material, the extraction of the clear liquid (replacing the slurry thickener and the concentration filter), and the concentrated liquid is returned to the reactor to continue to participate in the reaction: After flow metering and control, the slurry raw liquid enters the top space of the equipment through the N1a and N1b ports of the equipment respectively. Due to the separation of the scraper disc, the slurry raw liquid flows parallel to the filter surface of the filter disc. Under the pressure, it starts from the top filter disc of the equipment alternately, flows through all the filter surfaces of the filter discs to reach the concentrated liquid outlet at the bottom of the equipment. During this period, part of the liquid passes vertically through the filter surface of the filter disc under the pressure 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 surface of the filter disc to form filter cakes on the surface. The main shaft drives the scraper disc to rotate at a certain speed. The scraper assembly scrapes and thins the filter cake layer on the surface of the filter disc to maintain the filter in a low resistance state.

[0054] The filtrate flows out from each clear liquid outlet, enters the filtrate collecting pipe through each valve and pipeline sight glass, and then flows out from the N2 port of the equipment. Since each filter disc is individually controlled by its own valve, when a filter disc is accidentally damaged and the catalyst is entrained and flows out, the position of the damaged filter disc can be determined through the pipeline sight glass of each clear liquid outlet. Closing the corresponding outlet valve can maintain the normal operation of the equipment without affecting production.

[0055] After the clear liquid flows out from the N2 port, it can be measured by the flow meter and its flow rate can be controlled to meet the production process requirements. Finally, the clear liquid is filtered again by the safety filter and flows out to the next production process. After the concentrated liquid flows out from the equipment N3, it is also measured and flows back to the upstream reactor to continue to participate in the reaction.

[0056] In the early stage of equipment use, since the filter cake layer has not yet formed, the filtering accuracy of the equipment has not reached the maximum effect, and the filtrate will flow out of turbid liquid for a period of time. At this time, the valve for the filtrate to flow into the safety filter can be closed, and the valve on the circulation pipeline can be opened to allow the filtrate to be circulated and filtered. After the filter cake layer is formed on the filtering surface of the filter disc of the equipment, the filtrate can reach the cleanliness required by the process. At this time, the valve for the filtrate to flow into the safety filter can be opened, and the valve on the circulation pipeline can be closed to allow the system to output the filtrate to the downstream of the process.

[0057] As the filtration time increases, the filtration resistance of the equipment will inevitably increase. When the pressure difference between the slurry raw liquid inlet pressure PIT002 and the filtrate outlet pressure PIT005 reaches the process setting value, the equipment can be temporarily cut out of the system for offline self-cleaning.

[0058] Self-cleaning is divided into backwashing and forward washing. Close the equipment's slurry stock liquid inlet valve and the filtrate liquid outlet valve, switch the valve to allow the equipment's concentrated liquid outlet to flow to the waste catalyst storage tank, open the backwash liquid inlet valve, and open the backwash liquid diversion pipe to each filter disc valve in turn, so that the backwash liquid flows to the corresponding filter disc. The backwash liquid passes through the filter surface of the filter disc from the inside to the outside to backwash the filter cake on its surface. The backwash pressure of the backwash liquid shall not be greater than 0.1MPa (guaranteed by the safety valve on the backwash pipeline), and the mixed liquid from the backwash flows to the waste catalyst storage tank through the equipment's concentrated liquid outlet.

[0059] When all the filter discs have completed backwashing, the equipment can be forward washed. At this time, close the valve on the backwash liquid pipeline, keep the concentrated liquid outlet of the equipment connected to the waste catalyst storage tank, open the slurry stock liquid inlet valve, and allow the slurry stock liquid to pass through the surface of the filter surface of each filter disc in a parallel flow manner to flush the residual filter cake on its surface. The mixed liquid flows to the waste catalyst storage tank through the concentrated liquid outlet. When the forward washing time of the equipment reaches the process setting time, the equipment completes its offline cleaning process and has restored its filtering capacity.

[0060] At this time, the valve on the pipeline can be switched to connect the concentrated liquid outlet of the equipment to the path when the equipment is in normal working state, open the clear liquid outlet valve of the equipment, and switch the flow direction to the safety filter to the circulation filtration state. After the cleanliness requirement of the filtered liquid output meets the process requirements, switch back to the normal filtration working state, complete the formal commissioning of the equipment and then use it again. The offline cleaning process keeps the main shaft of the equipment running without stopping, and the equipment does not need to be dismantled.

[0061] When the filter surface of the filter disc is stuck with numerous solid particles and cannot be self-cleaned by backwashing and forward washing to quickly restore the filtering capacity, the equipment can be disassembled to remove the filter disc, and the filter disc can be disassembled to remove the smallest filter unit (filter disc filtering surface), and then repeatedly rinsed with a high-pressure water gun on both sides or chemically cleaned, or calcined in an anaerobic state to burn the solid particles, and finally the filtering surface of the filter disc can be restored to its filtering capacity. Of course, the filter surface of the filter disc can also be directly replaced.

[0062] After testing and calculation, the output of filtrate from one unit of this equipment (25m²) is roughly equivalent to the output of filtrate from 2-3 units of traditional slurry thickeners (40m²). The specific output can also be adjusted according to the working status of the respective systems and process requirements.

[0063] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0064] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of 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 circumstances.

[0065] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying 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 multifunctional stacked concentration filter, comprising a support (1), an upper end cover (8), and a lower end cover (16), characterized in that: A lower end cover (16) is fixedly mounted on the top of the bracket (1), a concentrated liquid discharge section (2) is penetrated and fixedly mounted in the middle of the bottom surface of the lower end cover (16), a plurality of stacked annular filter frames (03) are mounted on the top of the lower end cover (16), an annular feed section (17) is fixedly mounted on the bottom of the upper end cover (8), the bottom of the feed section (17) is placed on the top of the uppermost annular filter frame (03), a feed port (6) is mounted on the side wall of the feed section (17), and the inner side of each annular filter frame (03) is provided with a filter element (17). An annular filter disc (3) is mounted on each surface, the interior of the filter disc (3) is hollow, and the upper and lower layers are both filter disc filter surfaces (19), and a clear liquid outlet (15) and a backwash liquid inlet (5) that are symmetrically connected to the interior of the filter disc (3) are fixedly mounted on the outer wall of each annular filter frame (03), a main shaft (14) is rotatably mounted in the middle of the upper end cover (8), and a plurality of scraper assemblies (4) are mounted on the outer surface of the main shaft (14), which are respectively placed between each two filter discs (3) and have a spacing from the two filter discs (3).

2. A multifunctional stacked concentration filter according to claim 1, characterized in that: The invention also comprises a double-end mechanical seal device (9), a bearing box (10), a coupling (11), a 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 discharge section (2); the main shaft (14) passes through the middle of a plurality of filter discs (3) and is installed in the sliding bearing sleeve (20); the motor (13) and the reducer (12) are directly connected and connected to the main shaft (14) via the coupling (11); and a concentrated liquid outlet (18) is provided at the bottom of the concentrated liquid discharge section (2).

3. A multifunctional laminated concentration filter according to claim 1, characterized in that: A screw ring (07) is fixedly mounted on the outer wall of each of the plurality of annular filter frames (03), and the upper end cover (8) and the lower end cover (16) are tightened and fixed by a screw nut assembly (7) passing through the plurality of screw rings (07).

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

5. The 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 multifunctional stacked concentration filter according to claim 1, characterized in that: The scraper assembly (4) comprises a scraper sleeve (41), a scraper disc (42), a scraper auger box (43), a lower filter cake scraper (44), an upper 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 mounted on the outside of the main shaft (14); a scraper disc (42) is mounted on the outside of the scraper sleeve (41); a plurality of scraper auger boxes (43) with bottom openings are fixedly mounted on the outer surface of the scraper disc (42); a lower filter cake scraper (44) is fixedly mounted on the bottom end of the side of the scraper auger box (43) facing the direction of rotation thereof; an upper filter cake scraper (45) is fixedly mounted on the top of the scraper auger box (43); A filter cake inlet groove (46) located above the lower filter cake scraper (44) is penetrated on the side of the box (43), a filter cake auger (47) is rotatably mounted in the scraper auger box (43), an auger drive gear ring (48) is fixedly mounted on the top of each filter disc (3), and 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 mounted with an auger drive gear (49) meshing with the auger drive gear ring (48).

7. A multifunctional stacked concentration filter according to claim 6, characterized in that: A filter cake shifting ring (50) is coaxially rotatably mounted on the top surface of the scraper disc (42); the filter cake shifting ring (50) is annular and has a plurality of arc-shaped shifting pieces (51) evenly distributed around the circumference fixedly mounted on its outer surface; a rack ring groove (52) is formed at the bottom of the filter cake shifting ring (50); a shifting ring rack (53) is fixedly mounted in the rack ring groove (52); a gear groove (54) penetrates between the top surface of the scraper disc (42) and the ground; an end of the filter cake auger (47) close to the scraper disc (42) penetrates into the gear groove (54) and has a shifting ring gear (55) coaxially fixedly mounted thereon that meshes with the shifting ring rack (53).

8. A multifunctional stacked concentration filter according to claim 7, characterized in that: The filter cake shifting ring (50) is a conical ring, and its outer diameter is the same as that of the scraper disk (42), and a plurality of arc-shaped shifting pieces (51) are evenly distributed on its conical surface.

9. The multifunctional stacked concentration filter according to claim 6, characterized in that: The scraper disc (42) is sleeved and mounted on the outside of the scraper sleeve (41); a scraper adjustment groove (56) is provided 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) threadably matched with the scraper adjustment block (57) is rotatably mounted between the top and bottom surfaces of the scraper adjustment groove (56); a screw countersunk hole is provided on the top surface of the scraper sleeve (41); the top end of the scraper adjustment screw (58) passes through the screw countersunk hole and is connected to a hexagonal screw head (59).

10. A method for using a multifunctional stacked concentration filter for slurry concentration, characterized in that: The steps are: a. The catalyst-containing slurry enters the feed section (17) from the feed port (6) and flows through the filter surfaces (19) of the filter discs (3) in parallel in a series manner; b. When the slurry flows in parallel on the filter surface (19) of the filter disc, part of the liquid passes through the filter surface (19) of the filter disc under the pressure energy and reaches the inner space of each filter disc (3), and then flows out from the clear liquid outlet (15) connected to the filter disc (3), and the clear liquid flowing out from each clear liquid outlet (15) is collected and sent to the product refining system; c. The catalyst solid particles carried by the slurry are partially intercepted by the filter surface (19) of the filter disc to form a filter cake. After the clear liquid is extracted from the slurry by each filter disc (3), the concentrated liquid is formed and enters the concentrated liquid discharge section (2). Finally, it is discharged from the concentrated liquid outlet (18) and returned to the reaction system for reuse; d. The backwash liquid enters the interior of each filter disc (3) from each backwash liquid inlet (5), passes through the filter surface (19) of each filter disc from the inside to the outside, and backwashes and regenerates the filter surface (19). The backwash liquid carries the washed filter cake and flows out from the concentrated liquid outlet (18) to the waste catalyst storage tank of the system.

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