On-line catalyst grading device

Abstract

The invention discloses an online catalyst grading device which comprises a sealing bin, a center shaft, a cylinder screen, a mechanical seal and a screen blowing system. The center shaft can rotate in the feeding end cover shaft sleeve and the discharging end cover shaft sleeve, the drum screen comprises a screen mesh and a drum frame for supporting the screen mesh, the drum screen is coaxially fixed to the center shaft through the drum frame and synchronously rotates in the sealing bin along with the center shaft, and a feeding pipe communicated with the inlet end of the drum screen is arranged on a feeding end cover of the sealing bin. A whole material discharging pipe communicated with the outlet end of the cylinder screen is arranged on a discharging end cover of the sealing bin, a crushed material discharging pipe is arranged on the portion, below the cylinder screen, of the sealing bin cylinder body, a material collecting partition plate is arranged below the discharging end of the cylinder screen, and a screen blowing system is arranged in an annular cavity in the side face of the cylinder screen. The catalyst particle screening device can accurately screen catalyst particles, eliminates blockage of fine catalyst particles and dust to the screen, and ensures safe and stable operation of the device.

Description

Technical Field

[0001] The invention belongs to the field of petrochemical industry and relates to a catalyst classification device, in particular to an online catalyst classification device. Background Art

[0002] Reactor layouts for continuous reforming, alkane dehydrogenation, and light hydrocarbon aromatization are usually arranged in overlapping and parallel ways. For reactors arranged in parallel, the catalyst enters the first and second reactors, the lower hopper, and the catalyst lifter from the reduction chamber by gravity, and then is lifted to the upper hopper of the third reactor by lifting gas. From the upper hopper of the third reactor, it enters the third and fourth reactors by gravity. The carbon-containing catalyst to be regenerated is lifted to the regeneration system after coming out of the last reactor. The regenerated catalyst is lifted to the reduction chamber through the lifter (or L valve group) to complete the catalyst cycle after the carbon deposits are removed through the processes of charring, oxychlorination, roasting, etc. in the regeneration system. Uninterrupted catalyst delivery is the key to achieving continuous reaction, and catalyst lifting is the key to ensuring the continuous circulation of the catalyst between the reaction and regeneration systems. Catalyst wear, burning, drying, production fluctuations, etc. will generate catalyst fragments and dust. When the catalyst fragments and dust continue to increase and accumulate in the lifter, it will cause difficulty in catalyst fluidization and affect lifting. In addition, the fragments and dust will further wear and increase dust generation during the lifting process, causing deformation and rupture of internal components and increased pressure drop. In severe cases, it may lead to unplanned shutdown of the device.

[0003] The existing domestic and foreign technologies all use dust collectors to recover catalyst dust, that is, hot air is used to carry catalyst dust into the dust collector, and the catalyst dust is deposited on the filter element for dust removal. The dust removal effect depends on the hot air volume. Too much air volume may entrain the entire catalyst particles and cause catalyst waste. Too little air volume may cause the catalyst dust to not be blown clean and block the downstream equipment. The dust removal effect of the catalyst dust cannot be strictly controlled.

[0004] Some domestic patented devices for catalyst grading, such as CN216302721U, a grading storage device for waste catalysts, include a feeder, a vibrating screen, a crushing facility, an air suction duct and a connected cyclone dust collector, etc. It mainly provides a grading storage device for waste catalyst blocks to avoid dust leakage and improve the dust recovery effect during the recovery of catalyst blocks.

[0005] CN208527019U A catalyst fine powder classification recovery device comprises a classifier, a cyclone separator, a dust collector and an induced draft fan. Through the process flow of catalyst fine powder-feeding system-classifier-cyclone separator-pulse dust collector-induced draft fan, all fine powders less than or equal to 44 μm in low-temperature Fischer-Tropsch synthesis catalyst are removed to achieve the quality index of catalytic products.

[0006] CN118403788A spherical catalyst physical classification device belongs to the field of catalyst physical classification, including an elevator, a silo, an electromagnetic discharge valve, a balanced feeder, an electric heating area, a wind distribution guide area, a material collection platform, and a catalyst collection area, etc. It can effectively separate low-carbon catalysts that can be continuously recycled, high-carbon catalysts whose active sites are covered by difficult-to-desorb substances and deactivated, broken catalyst particles, dust and other particulates, reduce the wear of catalyst particles, and the device has a compact structure and high screening efficiency.

[0007] These patented devices only solve the problem of catalyst classification and recovery at normal temperature and pressure, and cannot be applied to online classification of catalysts at high temperature and high pressure. Summary of the invention

[0008] In order to solve the problem in the prior art that the catalyst pipeline of the high-temperature and high-pressure catalyst continuous circulation regeneration system cannot be graded online to remove fine catalyst particles, and the fine particles may cause blockage, resulting in the inability to smoothly operate continuous reforming, alkane dehydrogenation and light hydrocarbon aromatization devices, the present invention provides a catalyst online grading device.

[0009] The invention provides an online catalyst grading device, comprising a sealing bin, a central axis, a drum screen, a mechanical seal and a screen purge system; the sealing bin is cylindrical, comprising a cylindrical barrel and end covers at both ends, one end being a feed end cover and the other end being a discharge end cover, a feed end cover shaft sleeve is arranged at the center of the feed end cover, a discharge end cover shaft sleeve is arranged at the center of the discharge end cover, the central axis passes through the feed end cover shaft sleeve and the discharge end cover shaft sleeve, the central axis can rotate in the feed end cover shaft sleeve and the discharge end cover shaft sleeve, and mechanical seals are arranged between the central axis and the feed end cover shaft sleeve and the discharge end cover shaft sleeve respectively; the drum screen comprises a screen and a drum frame supporting the screen, the drum screen is coaxially fixed to the central axis through the drum frame and rotates synchronously with the central axis in the sealing bin, the drum screen is open at both ends, and one end is provided with a plurality of holes; the drum screen ... One end is the feed end, and the other end is the discharge end, and an annular cavity is formed between the drum screen and the inner wall of the cylindrical barrel of the sealed bin; an oblique upward feed pipe connected to the inlet end of the drum screen is provided on the feed end cover of the sealed bin, which is deviated from the feed end cover shaft sleeve, and a downward whole material discharge pipe connected to the outlet end of the drum screen is provided on the discharge end cover of the sealed bin, which is deviated from the discharge end cover shaft sleeve, and a crushed material discharge pipe connected to the annular cavity and facing the screen of the drum screen is provided on the cylinder body of the sealed bin below the drum screen; an aggregate partition plate is provided below the discharge end of the drum screen to divide the lower space of the sealed bin into a whole material discharge area and a crushed material discharge area; a screen purge system is provided in the annular cavity on the side of the drum screen, and the screen purge system is fixed on the cylinder body of the sealed bin and connected to the external air source through the air inlet main pipe.

[0010] The drum frame of the cylindrical screen includes a hollow shaft, radial support ribs and annular support rings, one end of the radial support ribs is fixed to the hollow shaft, and the other end is fixed to the inner side of the annular support ring. The drum frame is in a cylindrical hollow (bird cage) shape as a whole, the screen mesh is wrapped and fixed to the outer side of the drum frame, and the cylindrical screen is fixed to the central shaft through the hollow shaft set. As an improvement, the drum frame also includes axial support bars, which are cross-fixed with the annular support ring.

[0011] The screen purge system includes an air intake main pipe, an air intake branch pipe and a nozzle. The air intake main pipe is connected to the air intake branch pipe. The air intake branch pipe is parallel to the axial direction of the cylindrical screen in the annular space. A nozzle for spraying air toward the screen is provided on the wall of the air intake branch pipe. The screen purge system is fixed to the sealing bin cylinder through the air intake main pipe.

[0012] As an improvement, in order to make the feed more uniform, the outlet end of the feed pipe connected to the inlet end of the drum screen in the sealed bin is sleeved on the central axis, and an annular feed annular gap coaxial with the central axis is formed between the outlet end of the feed pipe and the central axis; as a further improvement, in order to prevent the feed falling on the central axis from splashing to the outside of the drum screen with the rotation of the central axis, affecting the classification effect, a feed protection tube is set on the central axis at the outlet end of the feed pipe, the feed protection tube penetrates into the inside of the feed pipe and sleeved on the central axis, the central axis rotates relative to the feed protection tube, one end of the feed protection tube close to the inner side of the feed end cover is welded to the wall of the feed pipe, the other end of the feed protection tube is concentric with the outlet end of the feed pipe and the end face is flush, and an annular feed annular gap is formed between the outlet end of the feed pipe and the feed protection tube. The function of the feed protection tube is to ensure that the feed completely enters the drum screen.

[0013] In order to further remove catalyst dust and avoid clogging subsequent equipment, which would lead to the problem that continuous reforming, alkane dehydrogenation and light hydrocarbon aromatization devices could not operate smoothly, a dust gas exhaust pipe and a purified gas exhaust pipe connected to the annular cavity are provided on the sealed silo body as an improvement plan. The dust gas exhaust pipe is used to be connected to the dust gas inlet of the gas dust removal device, and the purified gas exhaust pipe is used to be connected to the dust removal gas outlet of the gas dust removal device.

[0014] As an improvement, in order to ensure that the crushed catalyst is discharged smoothly from the crushed material discharge pipe, the aggregate separation plate is a conical surface, and is arranged in the annular cavity between the lower side of the cylindrical screen outlet and the crushed material discharge pipe; as a further improvement, a front end aggregate baffle with a conical surface is provided in the annular cavity between the lower side of the cylindrical screen inlet and the crushed material discharge pipe; as a further improvement, in order to ensure that the whole material catalyst is discharged smoothly from the whole material discharge pipe, an end aggregate baffle with a conical surface is provided in the cavity between the outlet end of the cylindrical screen and the whole material discharge pipe.

[0015] As an improvement, a plurality of screen replacement windows are provided above the sealing silo cylinder body, and screen replacement window covers are installed on the screen replacement windows. After the screen replacement window covers are removed, the screen replacement operation can be performed from the screen replacement windows.

[0016] When the present invention is installed, the central axis forms a certain angle with the horizontal plane, and one side of the feed end cover is higher than the other side of the discharge end cover. When the cylindrical screen rotates with the central axis, after the catalyst flows into the cylindrical screen through the feed pipe, the catalyst will continuously rotate, slide, roll or fall in the cylindrical screen along with the rotation of the cylindrical screen, and move forward and downward along the cylindrical screen wall with a certain horizontal inclination angle. During this movement of the catalyst, the catalyst fragments that are smaller than or equal to the mesh holes will pass through the mesh holes and fall into the fragment discharge area, and be discharged through the fragment discharge pipe; the catalyst bulk that is larger than the mesh holes will flow out from the discharge end of the cylindrical screen and fall into the bulk discharge area, and be discharged through the bulk discharge pipe.

[0017] The present invention has the following beneficial effects:

[0018] 1) The online grading device of the present invention can be used in the cyclic process of continuous catalyst regeneration, is suitable for a sealed environment of high temperature and high pressure, and can achieve accurate screening of catalyst particles by a rotating cylindrical screen, thereby reducing the potential safety hazards of deformation, rupture of internal components and increased pressure drop due to blockage of the reactor, and ensuring safe and stable operation of the device.

[0019] 2) The online grading device of the present invention adopts a non-vibration screening method, and the interface connected to the catalyst continuous circulation regeneration system will not be damaged by strong vibration, and will not affect the catalyst continuous circulation regeneration system; the catalyst particles will not be crushed due to strong vibration impact.

[0020] 3) The online grading device of the present invention is provided with a screen blowing device, which can realize the blowing of the screen under the normal screening operation of the catalyst classifier, thereby eliminating the blockage of the screen by fine catalyst particles and dust, and improving the stability of the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an online catalyst classification device of the present invention;

[0022] Figure 2 This is a schematic diagram of the external structure of the sealed chamber;

[0023] Figure 3 It is a schematic diagram of the arrangement of the feed protection pipe and the screen purge device in the sealed bin;

[0024] Figure 4 It is a schematic diagram of the structure of a drum screen;

[0025] Figure 5 It is a schematic diagram of the structure of the screen installation assembly;

[0026] Figure 6 It is a structural schematic diagram of the screen purge device;

[0027] Figure 7This is a schematic diagram of the connection structure between the air intake main pipe and the air intake branch pipe of the screen purge device.

[0028] In the figure: 1-reduction motor, 2-bearing and bearing seat, 3-mechanical seal, 4-sealed bin, 5-cylindrical screen, 6-replacement of screen window cover, 7-center shaft, 8-feed pipe, 9-mechanical seal, 10-bearing and bearing seat, 11-bracket, 12-front end aggregate baffle, 13-crushed material discharge pipe, 14-aggregate partition plate, 15-end aggregate baffle, 17-discharge end cover sleeve, 18-discharge end cover, 19-replacement of screen window, 20-sealed bin cylinder, 21-feed end cover, 22-feed pipe inlet, 23-feed end cover sleeve, 24-dust gas exhaust pipe, 25-inlet main pipe, 26-support fixing plate, 27-purified gas discharge pipe, 28-feed pipe outlet, 29-screen purge system, 30-feed protective pipe, 31-cylinder rack, 32-screen, 33-hollow shaft, 34-radial support ribs, 35-axial support strips, 36-annular support rings, 37-inner grid, 38-outer grid, 39-inlet branch pipe, 40-nozzle, 41-connecting pipe. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings.

[0030] like Figures 1 to 3 As shown, a catalyst online grading device provided by the present invention comprises a sealing bin 4, a central shaft 7, a cylindrical screen 5, a mechanical seal 3, a mechanical seal 9 and a screen purge system 29; the sealing bin 4 is cylindrical, comprising a cylindrical sealing bin body 20, a feed end cover 21 and a discharge end cover 18, a feed end cover shaft sleeve 23 is provided at the center of the feed end cover 21, a discharge end cover shaft sleeve 17 is provided at the center of the discharge end cover 18, the central shaft 7 passes through the feed end cover shaft sleeve 23 and the discharge end cover shaft sleeve 17, the central shaft 7 can rotate in the feed end cover shaft sleeve 23 and the discharge end cover shaft sleeve 17, and mechanical seals 9 and 3 are respectively provided between the central shaft 7 and the feed end cover shaft sleeve 23 and the discharge end cover shaft sleeve 17. The mechanical seal 9 and the mechanical seal 3 can prevent the catalyst and the high-temperature and high-pressure medium gas in the sealing bin 4 from leaking out. The feed end cover 21 and the discharge end cover 18 are both matched with the sealing bin cylinder body 20 with axial hole clearance, and are provided with seals, and are connected by multiple end face bolts.

[0031] The cylindrical screen 5 is open at both ends, one end is the feed end, and the other end is the discharge end, and an annular cavity is formed between the cylindrical screen 5 and the inner wall of the sealed bin cylinder 20; a feed pipe 8 is provided on the feed end cover 21 of the sealed bin 4, which is deviated from the feed end cover sleeve 23 and is connected to the inlet end of the cylindrical screen 5. The feed pipe inlet 22 is located above the outer side of the feed end cover 21, and the feed pipe outlet 28 is located on the inner side of the feed end cover 21 (the side of the sealed bin cylinder 20), and penetrates into the screen cylinder of the cylindrical screen 5. The feed pipe outlet 28 in the sealed bin 4 and connected to the inlet end of the cylindrical screen 5 is coaxially sleeved on the central shaft 7. A feed protection pipe 30 is provided in the annular gap between the feed pipe outlet 28 and the central shaft 7. The feed protection pipe 30 penetrates into the feed pipe 8 and is coaxially sleeved on the central shaft 7. The central shaft 7 rotates relative to the feed protection pipe 30. One end of the feed protection pipe 30 close to the inner side of the feed end cover 21 is welded to the wall of the feed pipe 8 and is welded to the inner end face of the feed end cover sleeve 23 as a whole. The other end of the feed protection pipe 30 is concentric with the feed pipe outlet and the end face is flush. An annular feed annular gap is formed between the feed pipe outlet 28 and the feed protection pipe 30. The function of the feed protection pipe 30 is to ensure that the feed completely enters the cylindrical screen 5. The lower semicircle of the feed protection pipe 30 between the wall of the feed pipe 8 and the inner end face of the feed end cover sleeve 23 is removed to prevent the accumulation of catalyst fragments and dust there.

[0032] A whole material discharge pipe 16 with a downward outlet connected to the outlet end of the cylindrical screen 5 is provided on the sealing bin discharge end cover 18 at a position deviating from the discharge end cover sleeve 17; a crushed material discharge pipe 13 connected to the annular cavity and facing the screen of the cylindrical screen is provided on the sealing bin cylinder body 20 below the cylindrical screen 5; a conical aggregate partition plate 14 is provided in the annular cavity below the outlet end of the cylindrical screen 5 and between the crushed material discharge pipe 13 to divide the lower space of the sealing bin 4 into a whole material discharge area and a crushed material discharge area; a conical front end aggregate baffle 12 is provided in the annular cavity below the inlet end of the cylindrical screen 5 and between the crushed material discharge pipe 13; and a conical end aggregate baffle 15 is provided in the cavity between the outlet end of the cylindrical screen 5 and the whole material discharge pipe 16.

[0033] The sealed silo body 20 is provided with a dust gas discharge pipe 24 and a purified gas discharge pipe 27 connected to the annular cavity. The dust gas discharge pipe 24 is used to communicate with the dust gas inlet of the gas dust removal device, and the purified gas discharge pipe 27 is used to communicate with the dust removal gas outlet of the gas dust removal device. A plurality of screen replacement windows 19 are provided above the sealed silo body 20, and a screen replacement window cover 6 is installed on the screen replacement window 19. After the screen replacement window cover 6 is removed, the screen replacement operation can be performed from the screen replacement window 19. A screen purge system 29 is provided in the annular cavity on the side of the cylindrical screen 5. The screen purge system 29 is fixed on the sealed silo body 20 and is connected to the external gas source through the air intake main pipe 25.

[0034] like Figures 4-5As shown, the cylindrical screen 5 includes a screen 32 and a drum frame 31 supporting the screen. The cylindrical screen 5 is coaxially fixed to the central shaft 7 through the drum frame 31 and rotates synchronously with the central shaft 7 in the sealed chamber 4. The drum frame 31 includes a hollow shaft 33, radial support ribs 34, axial support bars 35 and annular support rings 36. One end of the radial support ribs 34 is fixed to the hollow shaft 33, and the other end is fixed to the inner side of the annular support ring 36. A plurality of axial support bars 35 are provided and are evenly distributed along the circumferential direction of the cylindrical screen 5. The annular support rings 36 are evenly distributed along the axial direction of the cylindrical screen 5. The axial support bars 35 and the annular support rings 36 are cross-fixed. The drum frame 31 is cylindrically hollow (bird cage) shaped as a whole. The cylindrical screen 5 is fixed to the central shaft 7 through the hollow shaft 33. The screen 32 is sandwiched between the inner grid frame 37 and the outer grid frame 38. The inner grid frame 37, the screen 32 and the outer grid frame 38 together constitute a screen assembly. There is a screen assembly mounting groove (not shown in the figure) on the axial support bar 35. The screen 32 is fixed to the outer circumference of the drum frame 31 through the screen assembly and the screen assembly mounting groove.

[0035] like Figures 6-7 As shown, the screen purge system 29 includes an air intake main pipe 25, two air intake branch pipes 39 and a plurality of nozzles 40. The air intake main pipe 25 is connected to the two air intake branch pipes 39 through two connecting pipes 41 respectively. The air intake branch pipes 39 are parallel to the axial direction of the cylindrical screen 5 in the annular space. The pipe wall of the air intake branch pipe 39 is provided with nozzles 40 for spraying air toward the screen 32. The screen purge system 29 is fixed to the sealing bin cylinder 20 through the air intake main pipe 25. The nozzles 40 on the two air intake branch pipes 39 are arranged in a staggered manner, the central axis of the nozzle 40 is perpendicular to the central axis 7, and the exhaust port of the nozzle 40 is close to the screen 32 of the cylindrical screen 5.

[0036] like Figures 1 to 3As shown, when the present invention is used, it is obliquely installed on the bracket 11. The bracket 11 is a steel frame structure, and its upper end surface is a mounting plane. The mounting plane has an inclination angle with the horizontal plane. The central axis 7 is parallel to the mounting plane, that is, the central axis 7 has a certain inclination angle with the horizontal plane, and one side of the feed end cover 21 is higher than the side of the discharge end cover 18. Support fixing plates 26 are symmetrically arranged on both sides of the sealing bin cylinder 20, and the support fixing plates 26 are used to install and fix the sealing bin 4 on the mounting plane of the bracket 11. The two ends of the central axis 7 are fixed to the bracket 11 through bearings and bearing seats 2 and bearings and bearing seats 10, and the central axis 7 is driven by a reduction motor 1. When the reduction motor 1 drives the central axis 7 to drive the cylindrical screen 5 to rotate with the central axis 7, the catalyst enters the feed pipe 8 through the feed pipe inlet 22 and enters the inside of the cylindrical screen 5 through the feed annular gap formed between the feed pipe outlet 28 and the feed protection tube 30. After the catalyst flows into the cylindrical screen 5, the catalyst rotates, slides, rolls or falls continuously in the cylindrical screen 5 as the cylindrical screen 5 rotates, and moves forward and downward along the cylindrical wall of the cylindrical screen 5 with a certain horizontal inclination. During this movement of the catalyst, the catalyst fragments smaller than or equal to the mesh holes will pass through the mesh holes and fall into the fragment discharge area, and will be collected and guided by the aggregate partition plate 14 and the front aggregate baffle 12, and finally discharged through the fragment discharge pipe 13; the catalyst bulk material larger than the mesh holes will flow out from the discharge end of the cylindrical screen 5 and fall into the bulk discharge area, and will be collected and guided by the end aggregate baffle 15 and discharged through the bulk discharge pipe 16.

[0037] During the process of rotating the cylindrical screen 5 to screen and grade the catalyst, the catalyst particles and catalyst dust in the catalyst may cause the screen 32 to become sticky or blocked. The screen purge system 29 is started, and the clean high-pressure medium gas is supplied from outside to enter the intake branch pipe 39 through the intake main pipe 25 and sprayed on the outer surface of the screen 32 of the cylindrical screen 5 by the nozzle 40, so as to remove the catalyst particles or dust blocking the screen and ensure the normal operation of the catalyst online grading device. In order to further remove the catalyst dust and avoid clogging the subsequent equipment, a gas dust removal device can be connected between the dust gas discharge pipe 24 and the purified gas discharge pipe 27. The gas dust removal device is turned on, and the gas containing the catalyst dust is drawn out from the dust gas discharge pipe 24. The purified gas after the catalyst dust is removed by the gas dust removal device returns to the catalyst online grading device through the purified gas discharge pipe 27.

[0038] The feed pipe 8 of the catalyst online classification device of the present invention is connected to the discharge port at the bottom of the regenerator of the catalyst continuous circulation regeneration system, the whole material discharge pipe 16 is connected to the lower hopper of the regenerator, and the crushed material discharge pipe 13 is connected to the catalyst recovery tank with sealing and discharge performance. The pressure in the catalyst continuous circulation regeneration system is 1MPa and the temperature is 200℃. The whole material particles of the catalyst are ≥1mm, and the crushed material particles of the catalyst are <1mm.

Claims

1. A catalyst online classification device, characterized in that: It includes a sealing bin, a central axis, a drum screen, a mechanical seal and a screen purge system; the sealing bin is cylindrical, including a cylindrical barrel and end covers at both ends, one end is a feed end cover, and the other end is a discharge end cover, a feed end cover shaft sleeve is provided at the center of the feed end cover, and a discharge end cover shaft sleeve is provided at the center of the discharge end cover, the central axis passes through the feed end cover shaft sleeve and the discharge end cover shaft sleeve, the central axis can rotate in the feed end cover shaft sleeve and the discharge end cover shaft sleeve, and mechanical seals are respectively provided between the central axis and the feed end cover shaft sleeve and the discharge end cover shaft sleeve; the drum screen includes a screen and a drum frame supporting the screen, the drum screen is coaxially fixed to the central shaft through the drum frame and rotates synchronously with the central shaft in the sealing bin, the two ends of the drum screen are open, one end is a feed end, and the other end is a discharge end, and an annular cavity is formed between the drum screen and the inner wall of the cylindrical barrel of the sealing bin; A feed pipe which is inclined upward and connected to the inlet end of the cylindrical screen is provided on the feed end cover of the sealed bin, deviating from the feed end cover shaft sleeve; a whole material discharge pipe which is connected to the outlet end of the cylindrical screen and has a downward outlet is provided on the discharge end cover of the sealed bin, deviating from the discharge end cover shaft sleeve; a crushed material discharge pipe which is connected to the annular cavity and faces the screen of the cylindrical screen is provided on the cylinder body of the sealed bin below the cylindrical screen; a material collection partition plate is provided below the discharge end of the cylindrical screen to divide the lower space of the sealed bin into a whole material discharge area and a crushed material discharge area; a screen purge system is provided in the annular cavity on the side of the cylindrical screen, and the screen purge system is fixed on the cylinder body of the sealed bin and connected to the external air source through the air inlet main pipe.

2. The catalyst online classification device according to claim 1, characterized in that: The drum frame of the cylindrical screen includes a hollow shaft, radial support ribs and annular support rings, one end of the radial support ribs is fixed to the hollow shaft, and the other end is fixed to the inner side of the annular support ring. The drum frame is hollow cylindrical as a whole, the screen is covered and fixed to the outer side of the drum frame, and the cylindrical screen is fixed to the central shaft through the hollow shaft set.

3. The catalyst online classification device according to claim 2, characterized in that: The cartridge rack further comprises an axial support bar, which is cross-fixed with the annular support ring.

4. The catalyst online classification device according to claim 1, characterized in that: The screen purge system includes an air intake main pipe, an air intake branch pipe and a nozzle. The air intake main pipe is connected to the air intake branch pipe. The air intake branch pipe is parallel to the axial direction of the cylindrical screen in the annular space. A nozzle for spraying air toward the screen is provided on the wall of the air intake branch pipe. The screen purge system is fixed to the sealing bin cylinder through the air intake main pipe.

5. The catalyst online classification device according to claim 1, characterized in that: The outlet end of the feed pipe in the sealing bin and connected with the inlet end of the cylindrical screen is sleeved on the central axis, and an annular feed annular gap coaxial with the central axis is formed between the outlet end of the feed pipe and the central axis.

6. The catalyst online classification device according to claim 1, characterized in that: A feed protective tube is arranged on the central axis of the outlet end of the feed pipe. The feed protective tube penetrates into the interior of the feed pipe and is sleeved on the central axis. The central axis rotates relative to the feed protective tube. One end of the feed protective tube close to the inner side of the feed end cover is welded to the wall of the feed pipe. The other end of the feed protective tube is concentric with the outlet end of the feed pipe and the end face is flush. An annular feed annular gap is formed between the outlet end of the feed pipe and the feed protective tube.

7. The catalyst online classification device according to claim 1, characterized in that: The sealed silo body is also provided with a dust gas exhaust pipe and a purified gas exhaust pipe connected to the annular cavity. The dust gas exhaust pipe is used to be connected to the dust gas inlet of the gas dust removal device, and the purified gas exhaust pipe is used to be connected to the dust removal gas outlet of the gas dust removal device.

8. The catalyst online classification device according to claim 1, characterized in that: The aggregate separation plate is a conical surface and is arranged in an annular cavity between the lower side of the cylindrical screen outlet and the crushed material discharge pipe.

9. The catalyst online classification device according to claim 8, characterized in that: A front end material collecting baffle with a conical surface is arranged in the annular cavity between the lower side of the cylindrical screen inlet and the crushed material discharge pipe.

10. The catalyst online classification device according to claim 9, characterized in that: An end material collecting baffle with a conical surface is arranged in the cavity between the outlet end of the cylindrical screen and the whole material discharge pipe.

11. The catalyst online classification device according to claim 8, characterized in that: An end material collecting baffle with a conical surface is arranged in the cavity between the outlet end of the cylindrical screen and the whole material discharge pipe.

12. The catalyst online classification device according to claim 1, characterized in that: A plurality of screen replacement windows are arranged above the sealing bin cylinder body, and screen replacement window covers are installed on the screen replacement windows.

13. The catalyst online classification device according to claim 1, characterized in that: The feed end cover and the discharge end cover are both matched with the sealing bin cylinder body with an axial hole clearance, and are provided with seals, and are connected by multiple end face bolts.

Images