A high-temperature resistant dry filter for removing tar

Abstract

This invention belongs to the field of dust-laden waste gas treatment technology, specifically a high-temperature resistant tar-removing dry filter. It includes a housing, inside which a first-stage filtration unit, a second-stage filtration unit, and a third-stage filtration unit are sequentially arranged along the waste gas flow direction. The first-stage filtration unit consists of several rotating cylinders arranged side-by-side along the front-back direction of the housing's inner cavity. Each cylinder is a hollow, vertically oriented cylinder with uniformly distributed filter holes. The inner cavity of the cylinder is removably filled with ceramic rectangular saddle ring packing. During the filtration process, an annular brush fitted around the outside of the rotating cylinder covers and sweeps the filter holes, while a strip brush simultaneously cleans the mesh of the metal wire mesh filter. This process is continuously performed online during normal equipment operation without requiring shutdown for disassembly, effectively avoiding the production interruptions caused by frequent shutdowns for maintenance required by traditional equipment, and significantly improving equipment utilization.

Description

Technical Field

[0001] This invention relates to the field of dust-laden waste gas treatment technology, specifically a high-temperature resistant dry filter for removing tar. Background Technology

[0002] For high-temperature exhaust gases containing tar and dust at around 180℃, the conventional treatment processes currently include lime spraying bag filters and electrostatic precipitators.

[0003] The core logic of lime-sprayed baghouse dust collectors is "dust-assisted filtration and ash adsorption," meaning that limestone powder and other powders are sprayed into the pipes, utilizing their large specific surface area to adsorb tar. Simultaneously, the mixed dust forms a loose "powder cake" layer on the filter bag surface, protecting the filter bag from direct tar buildup. However, this technology has several problems: there is still a risk of penetration with particularly viscous tar, and once the bag becomes clogged, it may quickly become unusable; the sprayed lime powder and the formed powder cake layer increase system resistance and fan energy consumption; precise control of the spraying amount, timing, and uniformity is required, and improper operation can easily lead to pre-coating failure; the lime powder adsorbed with tar becomes hazardous waste and must be disposed of according to regulations, increasing treatment costs; and the pre-coating layer is difficult to maintain when the inlet dust concentration is too low.

[0004] Electrostatic precipitators utilize the principle of high-voltage electrostatic adsorption to efficiently remove tar and dust from exhaust gases. However, they also have drawbacks: the equipment itself and the associated high-voltage power supply system are costly, resulting in a high initial investment; they are sensitive to gas flow rate, with excessively high flow rates reducing purification efficiency; they are unsuitable for handling high-concentration dust, as excessive dust can interfere with the electric field and affect efficiency; when handling flammable and explosive gases, strict explosion-proof design is required; and some types of equipment have a large footprint, necessitating the development of a high-temperature resistant dry tar removal filter. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A high-temperature resistant dry filter for removing tar includes a housing, wherein a first-stage filter unit, a second-stage filter unit, and a third-stage filter unit are sequentially arranged inside the housing along the direction of exhaust gas flow.

[0008] The first-stage filtration unit consists of several rotating cylinders arranged side by side along the front-to-back direction of the inner cavity of the housing. The cylinders are hollow and vertical, and have uniformly opened filter holes. The inner cavity of the cylinders is detachably filled with ceramic rectangular saddle ring packing.

[0009] The second-stage filter unit is detachably installed in the inner cavity of the housing and is located downstream of the first-stage filter unit. The second-stage filter unit includes a mounting frame and a metal wire mesh filter fixed in the mounting frame.

[0010] The third-stage filtration unit is detachably installed in the inner cavity of the housing and is located downstream of the second-stage filtration unit;

[0011] It also includes a slow-rotation mechanism for controlling the slow rotation of several rotating drums, and a cleaning mechanism for scraping oil from the outside of the rotating drums and the metal wire mesh filter.

[0012] It also includes a drive mechanism for synchronously controlling the linkage between the slow-rotating mechanism and the cleaning mechanism.

[0013] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, the following features: an air inlet and an air outlet are respectively provided at the left and right ends of the housing; flanges are fixedly installed at the outer ends of the air inlet and the air outlet; exhaust gas flows into the housing through the air inlet and is filtered by the first-stage filtration unit, the second-stage filtration unit, and the third-stage filtration unit before flowing out through the air outlet; gas flow sensors are fixedly installed on both sides of the top of the housing near the air inlet and the air outlet, respectively; the probes of the two gas flow sensors are located inside the housing and on the left and right sides of the first-stage filtration unit, the second-stage filtration unit, and the third-stage filtration unit, respectively, and are used to monitor the flow rate of exhaust gas flowing into the housing and the flow rate after flowing out of the housing.

[0014] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, the bottom of the housing is provided with two liquid collection hoppers that communicate with the inner cavity of the housing. The first liquid collection hopper is located below the rotating drum and near the air inlet. The second liquid collection hopper is located below the rotating drum and the mounting frame. The top of the second liquid collection hopper is provided with inclined liquid guiding slopes around its perimeter. The bottom of the two liquid collection hoppers is funnel-shaped and is fixedly installed with a drain pipe with a valve.

[0015] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, wherein: a maintenance and cleaning port is provided on the front side wall of the housing, and a lockable maintenance door adapted to cover the maintenance and cleaning port is hinged to the front side wall of the housing, and a sealing layer is provided on the side of the maintenance door near the maintenance and cleaning port.

[0016] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, wherein: the upper and lower ends of the outer periphery of the rotating cylinder are respectively rotatably passed through the upper and lower side walls of the housing via the first sealing bearing; the top of the rotating cylinder is located above the housing, the top of the rotating cylinder is open and hinged with a lockable sealing cover; the bottom of the rotating cylinder is located below the housing, is funnel-shaped and fixedly installed with a discharge pipe with a valve; a liquid guide ring is fixedly installed at the lower position of the outer periphery of the rotating cylinder, the liquid guide ring is located at the bottom of the inner cavity of the housing and is a hollow frustum-shaped ring that is narrow at the top and wide at the bottom; the liquid guide ring is located above the first sealing bearing below and covers the first sealing bearing.

[0017] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, the shell and the mounting frame have a rectangular cross-section in side view. The top of the shell has an insertion port for vertical insertion and removal of the mounting frame. The inner side wall of the shell has a recessed groove for vertical sliding of the mounting frame. The bottom wall of the shell has a recessed limiting slot for vertical insertion and removal of the mounting frame. A magnetic suction plate is fixedly installed on the outer side of the top of the mounting frame. The magnetic suction plate is located above the shell. A magnetic frame is fixedly installed on the outer periphery of the top of the shell above the insertion port. The magnetic suction plate and the magnetic frame are magnetically attracted to each other. A handle is fixedly installed on the top of the magnetic suction plate.

[0018] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, the third-stage filtration unit includes an assembly frame that is bolted to the inner cavity of the housing. The side wall of the assembly frame is provided with a plurality of air inlets at equal intervals. A glass fiber bag filter is fixedly installed on one side of each air inlet on the side wall of the assembly frame. Exhaust gas flows into the glass fiber bag filter through the air inlet and flows out after filtration.

[0019] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, the slow-rotation mechanism includes a transmission gear fixed on the outer periphery of the upper end of each rotating drum. The transmission gear is located above the housing. All the transmission gears are arranged side by side in the front-rear direction, and two adjacent transmission gears are meshed.

[0020] As a preferred embodiment of the high-temperature tar-removing dry filter of the present invention, the cleaning mechanism includes a U-shaped lifting frame that is reciprocated and raised within the housing cavity. The lifting frame is located between the rotating cylinder and the mounting frame. A number of annular brushes corresponding to the number of rotating cylinders are fixedly installed on the side of the lifting frame near the rotating cylinder. Several annular brushes are sequentially set on the outside of the rotating cylinder. A strip brush is fixedly installed on the side of the lifting frame near the mounting frame. The reciprocating lifting frame drives the bristles of the annular brushes and the bristles of the strip brushes to clean the filter holes and the mesh of the metal wire mesh filter, respectively.

[0021] As a preferred embodiment of the high temperature resistant tar removal dry filter according to the present invention, the driving mechanism comprises a fixing frame fixed on the top of the shell, the side cross section of the fixing frame is in the shape of a "n" character, two vertical guide rods are respectively fixedly arranged at the front and rear between the fixing frame and the shell, a lifting plate is arranged on the outer sides of the two guide rods in a lifting and sliding manner through a first linear bearing, a vertical reciprocating screw rod is rotatably installed in the middle between the fixing frame and the shell through a bearing sleeve, a matched screw nut is movably sleeved on the outer side of the reciprocating screw rod, the outer side of the screw nut is fixedly penetrated through the middle part of the lifting plate, the rotating reciprocating screw rod drives the screw nut and the lifting plate to perform reciprocating lifting movement along the rod body direction of the guide rods, a deceleration servo motor for driving the reciprocating screw rod is fixedly arranged at the top of the fixing frame, vertical assembly rods are fixedly arranged around the bottom of the lifting plate, the outer sides of the four assembly rods slidably penetrate through the top of the shell through second linear bearings, the lower ends of the four assembly rods are respectively and fixedly connected with the periphery of the top of the lifting frame, the top of the inner cavity of the shell is provided with vertical through holes for fixedly installing the second linear bearings, and an annular slag scraping ring is fixedly arranged at the top of the inner cavity of the shell directly below the through holes, and the four slag scraping rings are respectively sleeved on the outer sides of the four assembly rods for scraping off sundries outside the assembly rods;

[0022] The driving mechanism further comprises a vertical round rod coaxially fixed at the lower end of the reciprocating screw rod, a first change gear is fixedly arranged on the outer periphery of the round rod, a second change gear meshed with the first change gear is rotatably installed on the top of the shell through a rotating shaft, the second change gear is meshed with a transmission gear in the middle, the diameter of the transmission gear is larger than that of the second change gear, the diameter of the second change gear is larger than that of the first change gear, a storage shell is fixedly installed on the top of the shell, the top view of the storage shell is in an inverted "T" shape, the inner cavity of the storage shell is used for accommodating the first change gear, the second change gear and the transmission gear, and the outer sides of the round rod and the rotating cylinder respectively rotatably penetrate through the top of the storage shell through third sealing bearings.

[0023] The beneficial effects of the present invention are:

[0024] 1. The rotating cylinder in the first-stage filtering unit, with the ceramic saddle ring packing inside, intercepts large-particle dust and most tar mist droplets. The wire mesh filter of the second-stage filtering unit intercepts medium-sized particulate matter, and the glass fiber filter bag of the third-stage filtering unit performs high-efficiency precision filtration. The first two stages of filtering elements bear most of the pollutant load, effectively reducing the amount of tar and dust reaching the third stage. The synergistic effect of the three stages effectively reduces the frequency of consumable replacement and maintenance cost during long-term operation.

[0025] 2. The ceramic rectangular saddle ring packing is installed from the top of the rotating drum and removed from the bottom, allowing for packing replacement without disassembling the pipes or shell. The removed packing can be cleaned offline and reused. The mounting frame of the second-stage metal wire mesh filter is vertically inserted into the shell through the insertion port and magnetically fixed to the magnetic frame by the magnetic suction plate. It can be pulled out by lifting the handle upwards during cleaning, without the need for tools. The above structure simplifies daily maintenance operations, allowing for packing replacement and filter assembly disassembly and cleaning to be completed in a short time. This reduces the reliance on professional personnel and high-intensity labor for equipment maintenance. Compared with lime spraying baghouse dust collectors, which require continuous consumption of lime powder and generate hazardous waste, and electrostatic precipitators, which have high equipment investment, the operating cost of this invention is significantly reduced.

[0026] 3. During the filtration process, the annular brush fitted on the outside of the rotating drum covers and sweeps the filter holes, while the strip brush cleans the mesh of the metal wire mesh filter. The above process is carried out continuously online during normal operation of the equipment without the need for shutdown and disassembly, effectively avoiding the production interruption problem caused by frequent shutdowns for maintenance of traditional equipment, and significantly improving equipment utilization. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal components of the housing of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the rotating drum and other components of the present invention;

[0031] Figure 4 For the present invention Figure 3 Exploded view;

[0032] Figure 5 This is a schematic diagram of the cleaning mechanism, driving mechanism, and other components of the present invention, as well as the internal components of the housing.

[0033] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of region A in the middle;

[0034] Figure 7 This is a schematic diagram of the structure of the cleaning mechanism, driving mechanism, and other components of the present invention;

[0035] Figure 8This is a schematic diagram of the structure of the mounting frame after disassembly.

[0036] In the diagram: 100-Housing; 101-Air inlet; 102-Air outlet; 103-Gas flow sensor; 104-Liquid collection hopper; 105-Liquid guiding slope; 106-Drain pipe; 107-Inspection and cleaning port; 108-Inspection door; 200-First-stage filtration unit; 201-Rotating drum; 202-Filter hole; 203-First sealing bearing; 204-Sealing cover; 205-Discharge pipe; 206-Liquid guiding ring; 300-Second-stage filtration unit; 301-Mounting frame; 302-Metal wire mesh filter; 303-Insert; 304-Slide groove; 305-Limiting slot; 306-Magnetic suction plate; 307-Magnetic suction frame; 308-Handle; 400-Third-stage filtration unit; 401-Assembly Frame; 402-Air inlet; 403-Glass fiber bag filter; 500-Slow rotation mechanism; 501-Transmission gear; 600-Cleaning mechanism; 601-Lifting frame; 602-Annular brush; 603-Strip brush; 700-Drive mechanism; 701-Fixed frame; 702-Guide rod; 703-First linear bearing; 704-Lifting plate; 705-Bearing sleeve; 706-Reciprocating screw; 707-Screw nut; 708-Gearbox servo motor; 709-Assembly rod; 710-Second linear bearing; 711-Scraper ring; 712-Round rod; 713-First speed change gear; 714-Rotating shaft; 715-Second speed change gear; 716-Receiving shell; 717-Third sealed bearing. Detailed Implementation

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0041] Please see Figures 1 to 8The diagram shows a structural schematic of an embodiment of a high-temperature resistant tar removal dry filter according to the present invention. Please refer to [link / reference]. Figures 1 to 8 This paper provides a detailed introduction to a high-temperature resistant dry filter for removing tar.

[0042] Example 1

[0043] A high-temperature resistant dry filter for removing tar includes a housing 100. One end of the housing 100 is provided with an air inlet 101, and the other end is provided with an air outlet 102. The housing 100 adopts a double-layer structure of an outer shell and an inner shell, with the middle filled with thermal insulation materials such as rock wool. On the one hand, this effectively reduces the heat loss of high-temperature exhaust gas during the filtration process, ensuring the temperature of the exhaust gas entering the RTO system, which is beneficial to improving the thermal efficiency of the RTO system and reducing fuel consumption. On the other hand, the outer surface temperature of the housing is low, so it will not get hot and has good operational safety.

[0044] The left and right ends of the housing 100 are respectively provided with an air inlet 101 and an air outlet 102. The outer ends of the air inlet 101 and the air outlet 102 are fixedly installed with flanges (not shown in the figure), which are used to connect with the upstream waste gas pipeline and the downstream RTO system pipeline. Two liquid collection hoppers 104 communicating with the inner cavity of the housing 100 are welded and fixed to the bottom of the housing 100. The first liquid collection hopper 104 is located below the rotating drum 201 and close to the side of the air inlet 101. The second liquid collection hopper 104 is located below the rotating drum 201 and the mounting frame 301. The top of the second liquid collection hopper 104 is provided with inclined liquid guiding slopes 105 around its top. The bottom of the two liquid collection hoppers 104 is funnel-shaped and is fixedly installed with a drain pipe 106 with a ball valve. The outlet end of the drain pipe 106 is connected to the waste liquid collection tank.

[0045] The front side wall of the housing 100 is provided with an inspection and cleaning port 107. The front side wall of the housing 100 is hinged with a lockable inspection door 108 adapted to cover the inspection and cleaning port 107. A high-temperature resistant silicone rubber sealing strip is pasted on the side of the inspection door 108 near the inspection and cleaning port 107 to ensure airtightness when closed.

[0046] Gas flow sensors 103 are fixedly installed on the top of the housing 100 on both sides near the air inlet 101 and the air outlet 102. The probes of the two gas flow sensors 103 extend into the housing 100 and are located on the left and right sides of the first-stage filter unit 200, the second-stage filter unit 300 and the third-stage filter unit 400, respectively. The gas flow sensors 103 are used to monitor the flow rate of exhaust gas into the housing 100 and the flow rate after it flows out of the housing 100. The degree of blockage of the filter unit is determined by the flow rate difference.

[0047] Inside the housing 100, a first-stage filter unit 200, a second-stage filter unit 300, and a third-stage filter unit 400 are sequentially arranged along the direction of exhaust gas flow.

[0048] It also includes a slow rotation mechanism 500 for controlling the five rotating drums 201 to rotate slowly, and a cleaning mechanism 600 for scraping oil from the outside of the rotating drums 201 and the metal wire mesh filter 302.

[0049] It also includes a drive mechanism 700 for synchronously controlling the linkage between the slow-rotating mechanism 500 and the cleaning mechanism 600.

[0050] Example 2

[0051] The first-stage filtration unit 200 consists of five rotating cylinders 201 arranged side by side along the front-to-back direction of the inner cavity of the housing 100. The cylinders 201 are hollow vertical cylinders made of 304 stainless steel. The cylinder walls of the cylinders 201 are evenly provided with filter holes 202. The inner cavity of the cylinders 201 is detachably filled with ceramic rectangular saddle ring packing. The ceramic rectangular saddle ring packing is randomly packed into the cylinders 201, and the packing naturally accumulates without compaction. The diameter of the packing is larger than the aperture of the filter holes 202.

[0052] The upper and lower ends of the outer periphery of the rotating drum 201 are respectively rotatably passed through the upper and lower side walls of the housing 100 via the first sealed bearing 203. The first sealed bearing 203 is a high-temperature resistant stainless steel bearing, filled with high-temperature resistant grease. The top of the rotating drum 201 is located above the housing 100. The top of the rotating drum 201 is open and hinged with a lockable sealing cover 204. A high-temperature resistant silicone rubber sealing ring is provided between the sealing cover 204 and the top of the rotating drum 201. The bottom of the rotating drum 201 is located below the housing 100 and is funnel-shaped. A discharge pipe 205 with a ball valve is fixedly installed on the outer periphery of the rotating drum 201. A liquid guide ring 206 is fixedly installed at the lower position of the outer periphery of the rotating drum 201. The liquid guide ring 206 is located at the bottom of the inner cavity of the housing 100 and is a hollow frustum-shaped ring that is narrow at the top and wide at the bottom. The upper inner diameter of the liquid guide ring 206 is consistent with the outer diameter of the rotating drum 201 and is welded and fixed. The lower end of the liquid guide ring 206 is located on the first sealing bearing 203 below and covers the first sealing bearing 203 to prevent tar from flowing into the interior of the first sealing bearing 203 along the outer wall of the rotating drum 201.

[0053] Example 3

[0054] The second-stage filter unit 300 is detachably installed in the inner cavity of the housing 100 and is located downstream of the first-stage filter unit 200. The second-stage filter unit 300 includes a mounting frame 301 and a metal wire mesh filter 302 fixed in the mounting frame 301. The mounting frame 301 is made of 304 stainless steel and is rectangular in shape. The metal wire mesh filter 302 is made of 304 stainless steel wire mesh. The size of the metal wire mesh filter 302 is determined according to the inner cavity size of the housing 100.

[0055] The side cross-section of the housing 100 and the mounting frame 301 is rectangular. The top of the housing 100 has an insertion port 303 for vertical insertion and removal of the mounting frame 301. The inner wall of the housing 100 has a recessed groove 304 for vertical sliding of the mounting frame 301, the width of which is the same as the wall thickness of the mounting frame 301. The bottom wall of the inner cavity of the housing 100 has a recessed limiting slot 305 for vertical insertion and removal of the mounting frame 301. The top outer side of the mounting frame 301 protrudes for fixation. A magnetic plate 306 is provided, located above the housing 100. The magnetic plate 306 is a rectangular steel plate, wider than the socket 303. A magnetic frame 307 is fixedly installed on the outer periphery of the top of the housing 100 above the socket 303. A permanent magnet is embedded in the magnetic frame 307. The magnetic plate 306 and the magnetic frame 307 magnetically cooperate to fix the mounting frame 301. A handle 308 is fixedly installed on the top of the magnetic plate 306. The handle 308 is a U-shaped stainless steel round tube.

[0056] Example 4

[0057] The third-stage filter unit 400 is detachably installed in the inner cavity of the housing 100 and is located downstream of the second-stage filter unit 300. The third-stage filter unit 400 includes an assembly frame 401 that is bolted to the inner cavity of the housing 100. The assembly frame 401 is made of 304 stainless steel. Several air inlets 402 are evenly spaced on the side wall of the assembly frame 401. A glass fiber bag filter 403 is fixedly installed on one side of each air inlet 402 on the side wall of the assembly frame 401. Exhaust gas flows into the glass fiber bag filter 403 through the air inlet 402, is filtered, and then flows out. A support frame made of 304 stainless steel wire is provided inside the glass fiber bag filter 403 to support the filter bag and prevent it from collapsing.

[0058] Example 5

[0059] The slow rotation mechanism 500 includes a transmission gear 501 fixed on the outer periphery of the upper end of each rotating drum 201. The transmission gear 501 is located above the housing 100. All the transmission gears 501 are arranged side by side in the front-back direction, and two adjacent transmission gears 501 are meshed with each other with a transmission ratio of 1:1.

[0060] The cleaning mechanism 600 includes a "mouth"-shaped lifting frame 601 arranged in the inner cavity of the housing 100 in a reciprocating lifting manner. The lifting frame 601 is welded from 304 stainless steel square pipes and is located between the rotating drum 201 and the mounting frame 301. On the side of the lifting frame 601 close to the rotating drum 201, annular brushes 602 corresponding in number to the rotating drums 201 are fixed by bolts. The five annular brushes 602 are sleeved on the outer sides of the five rotating drums 201 one by one. The annular brush 602 is in a circular ring shape, with an inner diameter 2 to 5 mm larger than the outer diameter of the rotating drum 201, and the bristles are made of high-temperature resistant nylon. On the side of the lifting frame 601 close to the mounting frame 301, a strip brush 603 is fixed by bolts. The length of the strip brush 603 is consistent with the width of the wire mesh filter 302, and the bristles are also made of high-temperature resistant nylon. The reciprocatingly lifting lifting frame 601 drives the bristles of the annular brush 602 and the bristles of the strip brush 603 to clean the filter holes 202 and the meshes of the wire mesh filter 302 respectively;

[0061] The driving mechanism 700 includes a fixing frame 701 fixed on the top of the housing 100. The fixing frame 701 is welded from carbon steel square pipes, and its side-view cross-section is in the shape of a "Jia" character (open at the bottom). The bottom of the fixing frame 701 is fixed to the top of the housing 100 by bolts. Two vertical guide rods 702 are respectively fixedly arranged at the front and rear between the fixing frame 701 and the housing 100. The guide rods 702 are subjected to hard chrome plating on the surface. A lifting plate 704 is arranged on the outer sides of the two guide rods 702 in a lifting and sliding manner through first linear bearings 703. The lifting plate 704 is made of steel plate. A vertical reciprocating screw rod 706 is rotatably installed in the middle between the fixing frame 701 and the housing 100 through a bearing sleeve 705. A matching screw nut 707 is movably sleeved on the outer side of the reciprocating screw rod 706, and the outer side of the screw nut 707 is fixedly penetrated through the middle of the lifting plate 704. The rotating reciprocating screw rod 706 drives the screw nut 707 and the lifting plate 704 to perform reciprocating lifting movement along the rod body direction of the guide rods 702. A deceleration servo motor 708 for driving the reciprocating screw rod 706 is fixed on the top of the fixing frame 701 by bolts;

[0062] Vertical assembly rods 709 are fixedly arranged around the bottom of the lifting plate 704, and the surfaces of the assembly rods are subjected to hard chrome plating. The outer sides of the four assembly rods 709 slidably penetrate the top of the housing 100 through second linear bearings 710, and the lower ends of the four assembly rods 709 are respectively fixed to the periphery of the top of the lifting frame 601 by threaded connection. The top of the inner cavity of the housing 100 is provided with vertical through holes for fixedly installing the second linear bearings 710. An annular slag scraping ring 711 is fixedly arranged directly below the through hole at the top of the inner cavity of the housing 100 by bolts. The four slag scraping rings 711 are respectively sleeved on the outer sides of the four assembly rods 709, and the slag scraping rings are used to scrape off tar and sundries attached to the outside of the assembly rods 709;

[0063] The drive mechanism 700 also includes a vertical round rod 712 coaxially fixed to the lower end of the reciprocating lead screw 706. A first speed-changing gear 713 is fixedly mounted on the outer periphery of the round rod 712 via a flat key. A second speed-changing gear 715, meshing with the first speed-changing gear 713, is rotatably mounted on the top of the housing 100 via a rotating shaft 714. The second speed-changing gear 715 meshes with a central transmission gear 501. The diameter of the transmission gear 501 is larger than the diameter of the second speed-changing gear 715, and the diameter of the second speed-changing gear 715 is larger than the diameter of the first speed-changing gear 713. The slow rotation of the drum 201 is achieved through a three-stage reduction transmission. A storage shell 716 is fixedly installed by bolts. The storage shell 716 is made of stainless steel and has an inverted "T" shape when viewed from above. The inner cavity of the storage shell 716 is used to store the first gear 713, the second gear 715, and the transmission gear 501. A maintenance port is provided on the storage shell 716, and a lockable cover is hinged to the maintenance port. A through hole is provided on the top of the storage shell 716 at the position where the round rod 712 and the rotating cylinder 201 pass through. The outer sides of the round rod 712 and the rotating cylinder 201 respectively pass through the top of the storage shell 716 through the third sealing bearing 717. The third sealing bearing 717 is a high-temperature resistant sealing bearing.

[0064] The filling method of the ceramic rectangular saddle ring packing in the above embodiment is as follows: After the new ceramic rectangular saddle ring packing arrives, an unpacking and acceptance inspection should be carried out to check the appearance quality of the packing and ensure that there are no defects such as cracks, missing corners, or damage. Open the sealing cover 204 at the top of the rotating drum 201 and use compressed air to blow down the inner cavity from the top of the rotating drum 201 to remove any debris and dust that may be present inside. Use a flashlight to check whether there is any blockage or foreign matter on the inner wall of the rotating drum 201 and the filter hole 202. If there is any blockage, use a thin steel wire to clear it. Stop filling when the total filling height of the packing reaches 80% to 90% of the inner cavity height of the rotating drum 201. After filling, close the sealing cover 204 and lock it.

[0065] The commissioning and operation method of the high-temperature tar removal dry filter is as follows: First, after completing the equipment installation, pipeline connection and electrical wiring, conduct a no-load test run. Start the reduction servo motor 708 and observe whether the reciprocating screw 706 rotates normally, whether the lifting plate 704 moves smoothly back and forth along the guide rod 702, and whether each rotating drum 201 rotates slowly. Check whether there is any abnormal vibration or noise in each moving part. The no-load operation time is not less than 30 minutes. After confirming that each part is operating normally, stop the machine.

[0066] Secondly, slowly open the valve on the air inlet pipe to gradually introduce high-temperature tar-dust-containing exhaust gas at a temperature of about 180℃ into the equipment. Observe the reading of the gas flow sensor 103 to confirm that the difference between the inlet flow rate and the outlet flow rate is within a reasonable range. Gradually increase the inlet air volume to 100% of the design air volume and run continuously for 2 hours. During the operation, record the following parameters every 30 minutes: inlet 101 temperature, outlet 102 temperature, inlet flow rate, outlet flow rate, and the current and temperature of the geared servo motor 708. After confirming that all parameters are within the normal range, the equipment enters the formal operation state.

[0067] During normal operation, the geared servo motor 708 runs continuously. On one hand, it drives the lifting frame 601 to move up and down repeatedly through the reciprocating screw 706, so that the annular brush 602 and the strip brush 603 clean the mesh of the filter hole 202 and the metal wire mesh filter 302 respectively. On the other hand, through the meshing transmission of the first speed change gear 713, the second speed change gear 715 and the transmission gear 501, it drives each rotating drum 201 to rotate slowly, so that the packing layer is evenly subjected to the impact of exhaust gas, extending the service life of the packing. Two gas flow sensors 103 monitor the inlet and outlet gas flow in real time. When the outlet gas flow is 15% to 20% lower than the inlet gas flow, it indicates that the filter unit is heavily clogged and maintenance needs to be arranged. The tar and condensate collected in the collection hopper 104 should be discharged into the waste liquid collection bucket regularly, at least once a week, through the drain pipe 106.

[0068] When it is necessary to shut down, first close the valve on the air intake pipe to cut off the exhaust gas source, let the equipment continue to run unloaded for 5 to 10 minutes to discharge the residual exhaust gas inside, turn off the power of the geared servo motor 708, and wait for the equipment to cool down to room temperature before opening the maintenance door 108 for internal inspection and maintenance.

[0069] The maintenance method of the high temperature tar removal dry filter in the above embodiment is as follows: When the gas flow sensor 103 shows that the difference between the inlet and outlet gas flow is greater than 20% for a continuous period of time, or when it is observed that the surface of the rotating drum 201 is seriously covered with tar, it is necessary to clean or replace the ceramic rectangular saddle ring packing.

[0070] First, turn off the power supply and inlet / outlet valves of the equipment. After the equipment cools down to room temperature, open the maintenance door 108 and open the discharge pipe 205 valve at the bottom of the rotating drum 201 that needs to be cleaned. Unload the old packing into a special container. When unloading, gently scoop up the packing with a non-metallic shovel to avoid damaging the inner wall of the rotating drum 201 with excessive force. For old packing with severe scaling, use a high-pressure water gun with a pressure controlled at 10 to 15 MPa to rinse and soften the scale layer before disassembling. Collect the unloaded old packing and transport it to the cleaning area for offline cleaning. High-pressure water washing and solvent cleaning can be used. Alternatively, soaking in diesel or special cleaning agents for 4 to 8 hours, or high-temperature roasting at 400 to 600°C for 2 to 4 hours, can be used. After cleaning, the packing can be reinstalled for use after inspection to confirm that there is no damage. If the packing damage rate exceeds 10%, it should be replaced with new packing.

[0071] When the surface of the metal wire mesh filter 302 is heavily coated with tar and dust, pull the mounting frame 301 out of the socket 303 by lifting the handle 308 upwards. Move the mounting frame 301 to the cleaning area and use a high-pressure water gun with a pressure of 5 to 10 MPa to rinse the metal wire mesh filter 302 from the air outlet side to the air inlet side to remove the tar and dust adhering to the wire mesh surface. After rinsing, dry it with compressed air with a pressure of 0.3 to 0.5 MPa. Check whether the wire mesh is damaged or severely deformed. If the wire mesh is intact, reinsert the mounting frame 301 into the socket 303 of the housing 100 and fix it with the magnetic plate 306 and the magnetic frame 307. The metal wire mesh filter 302 can generally be cleaned and used repeatedly 2 to 3 times. If the wire mesh is severely damaged or the resistance is still high after cleaning, a new metal wire mesh filter 302 should be replaced.

[0072] Glass fiber bag filters 403 are consumables. When the filtration resistance reaches 2 to 4 times the initial resistance, it is usually 400 to 450 Pa. The old filter bags that are replaced should be disposed of in accordance with the requirements for hazardous waste treatment.

[0073] The lubricating oil of the geared servo motor 708 needs to be changed every 2000 hours of operation, and the amount added should be according to the motor nameplate. The first linear bearing 703 and the second linear bearing 710 should be filled with high-temperature grease every 500 hours of operation. The reciprocating screw 706 and the screw nut 707 should be coated with high-temperature grease every 500 hours of operation. All transmission gears, such as transmission gear 501, first speed change gear 713 and second speed change gear 715, should be coated with high-temperature grease through the maintenance port every 500 hours of operation.

[0074] Inspect the high-temperature resistant silicone rubber sealing strip of inspection door 108, the high-temperature resistant silicone rubber sealing ring of sealing cover 204, and the high-temperature resistant gaskets at each flange connection once a month. Replace them in time if they are aged, deformed or damaged.

[0075] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-temperature resistant tar-removing dry filter, comprising a housing (100), characterized in that: The housing (100) is provided with a first-stage filtration unit (200), a second-stage filtration unit (300) and a third-stage filtration unit (400) in sequence along the direction of exhaust gas flow. The first-stage filtration unit (200) consists of several rotating cylinders (201). The several rotating cylinders (201) are arranged side by side along the front-back direction of the inner cavity of the housing (100). The rotating cylinders (201) are hollow vertical rotating cylinders and have filter holes (202) evenly opened. The inner cavity of the rotating cylinders (201) is detachably filled with ceramic rectangular saddle ring packing. The second-stage filter unit (300) is detachably installed in the inner cavity of the housing (100) and located downstream of the first-stage filter unit (200). The second-stage filter unit (300) includes a mounting frame (301) and a metal wire mesh filter (302) fixed in the mounting frame (301). The third-stage filter unit (400) is detachably installed in the inner cavity of the housing (100) and is located downstream of the second-stage filter unit (300); It also includes a slow rotation mechanism (500) for controlling the slow rotation of several rotating drums (201), and a cleaning mechanism (600) for scraping oil from the outside of the rotating drums (201) and the metal wire mesh filter (302). It also includes a drive mechanism (700) for synchronously controlling the linkage between the slow-rotating mechanism (500) and the cleaning mechanism (600).

2. The high-temperature resistant tar-removing dry filter according to claim 1, characterized in that: The housing (100) is provided with an air inlet (101) and an air outlet (102) at its left and right ends, respectively. Flanges are fixedly installed at the outer ends of the air inlet (101) and the air outlet (102). Exhaust gas flows into the housing (100) through the air inlet (101) and is filtered by the first-stage filter unit (200), the second-stage filter unit (300) and the third-stage filter unit (400) before flowing out through the air outlet (102). Gas flow sensors (103) are fixedly installed on the top of the housing (100) on both sides near the air inlet (101) and the air outlet (102), respectively. The probes of the two gas flow sensors (103) are located inside the housing (100) and on the left and right sides of the first-stage filter unit (200), the second-stage filter unit (300) and the third-stage filter unit (400), respectively, and are used to monitor the flow rate of exhaust gas flowing into the housing (100) and the flow rate after flowing out of the housing (100).

3. The high-temperature resistant tar-removing dry filter according to claim 2, characterized in that: The bottom of the housing (100) is provided with two liquid collecting hoppers (104) that communicate with the inner cavity of the housing (100). The first liquid collecting hopper (104) is located below the rotating cylinder (201) and close to the air inlet (101). The second liquid collecting hopper (104) is located below the rotating cylinder (201) and the mounting frame (301). The top of the second liquid collecting hopper (104) is provided with inclined liquid guiding slopes (105). The bottom of the two liquid collecting hoppers (104) is funnel-shaped and is fixedly installed with a drain pipe (106) with a valve.

4. The high-temperature resistant tar-removing dry filter according to claim 2, characterized in that: The front side wall of the housing (100) is provided with an inspection and cleaning port (107), and the front side wall of the housing (100) is hinged to a lockable inspection door (108) adapted to cover the inspection and cleaning port (107). A sealing layer is provided on the side of the inspection door (108) near the inspection and cleaning port (107).

5. The high-temperature resistant tar-removing dry filter according to claim 1, characterized in that: The upper and lower ends of the outer periphery of the rotating cylinder (201) are respectively rotatably passed through the upper and lower side walls of the housing (100) by the first sealing bearing (203). The top of the rotating cylinder (201) is located above the housing (100). The top of the rotating cylinder (201) is open and hinged with a lockable sealing cover (204). The bottom of the rotating cylinder (201) is located below the housing (100) in a funnel shape and is fixedly installed with a discharge pipe (205) with a valve. A liquid guide ring (206) is fixedly installed on the lower part of the outer periphery of the rotating cylinder (201). The liquid guide ring (206) is located at the bottom of the inner cavity of the housing (100) and is a hollow frustum ring that is narrow at the top and wide at the bottom. The liquid guide ring (206) is located above the first sealing bearing (203) below and covers the first sealing bearing (203).

6. The high-temperature resistant tar-removing dry filter according to claim 1, characterized in that: The side cross-section of the housing (100) and the mounting frame (301) is rectangular. The top of the housing (100) is provided with an insertion port (303) for vertical insertion and removal of the mounting frame (301). The inner side wall of the housing (100) is recessed with a sliding groove (304) for vertical sliding of the mounting frame (301). The bottom wall of the inner cavity of the housing (100) is recessed with a limiting slot (305) for vertical insertion and removal of the mounting frame (301). A magnetic suction plate (306) is fixedly installed on the outer side of the top of the mounting frame (301). The magnetic suction plate (306) is located above the housing (100). A magnetic suction frame (307) is fixedly installed on the outer periphery of the top of the housing (100) above the insertion port (303). The magnetic suction plate (306) and the magnetic suction frame (307) are magnetically attracted to each other. A handle (308) is fixedly installed on the top of the magnetic suction plate (306).

7. A high-temperature resistant tar-removing dry filter according to claim 1, characterized in that: The third-stage filtration unit (400) includes an assembly frame (401) that is bolted to the inner cavity of the housing (100). The side wall of the assembly frame (401) is provided with a plurality of air inlets (402) at equal intervals. A glass fiber bag filter (403) is fixedly installed on one side of each air inlet (402) on the side wall of the assembly frame (401). Exhaust gas flows into the glass fiber bag filter (403) through the air inlet (402) and is filtered before flowing out.

8. A high-temperature resistant tar-removing dry filter according to claim 1, characterized in that: The slow-rotation mechanism (500) includes a transmission gear (501) fixed on the outer periphery of the upper end of each rotating drum (201). The transmission gear (501) is located above the housing (100). All the transmission gears (501) are arranged side by side in the front-back direction, and two adjacent transmission gears (501) are meshed.

9. A high-temperature resistant tar-removing dry filter according to claim 8, characterized in that: The cleaning mechanism (600) comprises a mouth-shaped lifting frame (601) arranged in the inner cavity of the housing (100) in a reciprocating lifting manner. The lifting frame (601) is located between the rotating drum (201) and the mounting frame (301). On the side of the lifting frame (601) close to the rotating drum (201), annular brushes (602) corresponding in number to the rotating drums (201) are fixedly arranged. A plurality of the annular brushes (602) are sleeved on the outer side of the rotating drums (201) one by one. On the side of the lifting frame (601) close to the mounting frame (301), a strip-shaped brush (603) is fixedly arranged. The reciprocating lifting lifting frame (601) drives the bristles of the annular brushes (602) and the bristles of the strip-shaped brush (603) to clean the filter holes (202) and the meshes of the wire mesh filter (302) respectively.

10. A high-temperature resistant tar-removing dry filter according to claim 9, characterized in that: The driving mechanism (700) comprises a fixing frame (701) fixed at the top of the housing (100). The side-view cross section of the fixing frame (701) is in the shape of a "冂". Two vertical guide rods (702) are fixedly arranged at the front and rear respectively between the fixing frame (701) and the housing (100). A lifting plate (704) is arranged on the outer sides of the two guide rods (702) in a lifting and sliding manner via first linear bearings (703). A vertical reciprocating screw rod (706) is rotatably mounted in the middle between the fixing frame (701) and the housing (100) via a bearing sleeve (705). A matched screw nut (707) is movably sleeved on the outer side of the reciprocating screw rod (706). The outer side of the screw nut (707) fixedly penetrates through the middle part of the lifting plate (704). The rotating reciprocating screw rod (706) drives the screw nut (707) and the lifting plate (704) to perform reciprocating lifting movement along the rod body direction of the guide rods (702). A deceleration servo motor (708) for driving the reciprocating screw rod (706) is fixedly arranged at the top of the fixing frame (701). Vertical assembly rods (709) are fixedly arranged around the bottom of the lifting plate (704). The outer sides of the four assembly rods (709) slidably penetrate through the top of the housing (100) via second linear bearings (710). The lower ends of the four assembly rods (709) are fixedly connected to the periphery of the top of the lifting frame (601) respectively. The top of the inner cavity of the housing (100) is provided with vertical through holes for fixedly mounting the second linear bearings (710). An annular slag scraping ring (711) is fixedly arranged at the top of the inner cavity of the housing (100) directly below the through holes. The four slag scraping rings (711) are respectively sleeved on the outer sides of the four assembly rods (709) for scraping off impurities on the exterior of the assembly rods (709); The drive mechanism (700) further includes a vertical round rod (712) coaxially fixed to the lower end of the reciprocating lead screw (706). A first speed-changing gear (713) is fixedly disposed on the outer periphery of the round rod (712). A second speed-changing gear (715) meshing with the first speed-changing gear (713) is rotatably mounted on the top of the housing (100) via a rotating shaft (714). The second speed-changing gear (715) meshes with a central transmission gear (501). The diameter of the transmission gear (501) is larger than the diameter of the second speed-changing gear (715). The diameter of the second gear (715) is larger than that of the first gear (713). A storage shell (716) is fixedly installed on the top of the housing (100). The storage shell (716) is inverted "T" shape when viewed from above. The inner cavity of the storage shell (716) is used to store the first gear (713), the second gear (715), and the transmission gear (501). The outer sides of the round rod (712) and the rotating cylinder (201) respectively rotatably pass through the top of the storage shell (716) through the third sealed bearing (717).

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