Industrial furnace tail gas dust removal device

Abstract

The present invention belongs to the technical field of tail gas dust removal, and particularly relates to an industrial furnace tail gas dust removal device, which includes a tower tank, a top chamber, filter cartridges, and a flushing pipe assembly. The filter cartridges are made in such a way that their barrel walls are rigid walls with micropores distributed thereon. The upper part of the columnar section of the tower tank is provided with a top plate for fixing the filter cartridges, and the lower part is provided with a support plate. A top cover is provided at the upper port of the filter cartridge, and a lifting drive unit matching the top cover is provided on the top chamber, so that the top cover can alternately block and open the upper port of the filter cartridge. The support plate is provided with a base matching the lower port of the filter cartridge. A valve cover unit capable of alternately switching the lower port of the filter cartridge between an open state and a blocked state is provided on the base. The flushing pipe of the flushing pipe assembly can rotate around the vertical axis, and a plurality of spray holes are provided on the pipe wall of the section extending into the filter cartridge. The filter cartridges of the present invention have rigid filter walls, and the sludge layer on the filter walls can be removed by means of reverse flushing, so that the air permeability and filtration capacity of the filter cartridges can be continuously restored.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial waste gas dust removal and separation, and particularly relates to an industrial furnace waste gas dust removal device. Background Art

[0002] In industrial furnaces fueled by hydrocarbons and hydrogen, the water vapor content in the waste gas is very high. For example: 1) In a furnace fueled by natural gas (mainly methane), if it burns in air, the volume fraction of water vapor in the waste gas is about 19%; if it burns in pure oxygen, the volume fraction of water vapor in the waste gas can be as high as about 66.7%; 2) In a furnace fueled by liquefied petroleum gas (mainly propane), if it burns in air, the volume fraction of water vapor in the waste gas is about 15.5%; if it burns in pure oxygen, the volume fraction of water vapor in the waste gas can be as high as about 57.1%; 3) In a furnace fueled by hydrogen, if it burns in air, the volume fraction of water vapor in the waste gas is about 34.7%; if it burns in pure oxygen, the volume fraction of water vapor in the waste gas can even be as high as 100%.

[0003] In the current industrial furnace waste gas treatment system, dry dust removal devices are widely used. The dust removal principle of the bag dust removal unit set therein is as follows: When the dust-containing waste gas passes through the fiber layer on the wall of the filter bag, a sieving phenomenon occurs, mechanical collision occurs between the dust particles and the bag wall, electrostatic adsorption occurs between the fibers of the bag wall and the dust particles, and under the influence of physical effects such as gravity and diffusion, the purpose of filtering and separating the dust particles in the waste gas is achieved. The working process of the bag dust removal unit is as follows: At first, when the dust-containing waste gas passes through the fiber layer on the wall of the filter bag, large dust particles collide with the bag wall and are blocked outside the filter bag, and fall into the conical section provided at the lower part of the dust removal tower tank (referred to as the tower tank) under the action of gravity. Some fine dust particles with smaller volumes enter the fiber mesh holes of the bag wall and are blocked. As more and more dust particles are blocked and adhered to the outer surface of the filter bag, smaller fine particles will also be blocked outside by the fiber layer of the filter bag under the influence of physical effects such as diffusion and static electricity. Therefore, for a long period of time, as the dust thickness on the outer surface of the filter bag continuously increases, the dust removal efficiency of the bag dust removal unit increases accordingly, and the resistance when the dust-containing waste gas flow passes through the fiber layer on the wall of the filter bag also continuously increases. When the pressure on both sides of the filter bag fiber layer (i.e., the inner and outer sides of the filter bag wall) increases to a certain extent, the ventilation volume of the dust removal unit will decrease significantly. At that time, it is necessary to start the dust cleaning unit and adopt dust cleaning measures such as mechanical vibration and / or air flow back blowing to remove the dust covering the outer surface of the filter bag. Therefore, at least two groups of bag dust removal units need to be provided in the tower tank, and while part of the dust is in the operating state of filtering the waste gas, the remaining part is in the dust cleaning / ash cleaning operating state. Finally, by continuously switching the operating states between the two parts of the dust removal units, the dust removal tower tank can be maintained in a continuous dust removal operating state.

[0004] However, when the above-mentioned bag filter is used to filter the soot with the characteristics of high-humidity combustion exhaust gas, the conductivity of the moisture contained in the exhaust gas will cause the electrostatic adsorption characteristics between the filter bag fibers and the fine soot / dust particles, as well as between the fine soot particles, to fail, greatly reducing the adsorption and dust removal ability of the filter bag; in addition, the moisture in the combustion exhaust gas is also extremely easy to condense on the fiber layer of the filter bag, and it is easy to mix with the soot particles in the exhaust gas to form muddy water and slurry. Because there is a strong entanglement effect between the flexible fibers constituting the filter layer of the filter bag and the sewage and sludge, no matter the current common dust cleaning measures such as mechanical shock or air flow backwashing are adopted, the mud and dirt entangled on the flexible fiber layer of the filter bag cannot be effectively removed, and the filter bag cannot be kept in a good filtration efficiency state for a long time. Therefore, the filter bag replacement frequency is relatively high, greatly increasing the operating cost of the dust removal system, and the applicable limitations are relatively significant. Summary of the Invention

[0005] The present invention provides an industrial furnace exhaust gas dust removal device. The filter cartridge adopted has a rigid filter wall, and the dirt layer attached to the filter wall can be removed by reverse flushing measures, so that the filter wall of the filter cartridge can continuously return to an effective air-permeable filtration state. The air-permeable filtration ability of the filter cartridge of the present invention has good cyclic recovery characteristics, so that it has a long service life, which helps to reduce the operating cost of the furnace exhaust gas dust removal system.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an industrial furnace exhaust gas dust removal device, including a tower tank and a top chamber fixed on a machine base, a plurality of filter cartridges distributed in the column section of the tower tank, and a plurality of flushing pipe assemblies corresponding to each filter cartridge one by one.

[0007] An exhaust gas inlet pipe seat is provided on the column section, an exhaust port is provided on the top chamber, and a fan is configured on the exhaust port. After the fan is started, the chamber of the top chamber can form a negative pressure space, so as to achieve the purpose of sucking and filtering the exhaust gas.

[0008] The barrel wall of the filter cartridge is made of an inorganic material blank and formed by high-temperature sintering, or made of a metal material by powder metallurgy process, and can form a rigid barrel wall with air-permeable filtration performance, that is, the obtained filter cartridge forms a rigid type barrel and a large number of micropores are distributed on its barrel wall. Because the barrel wall of the filter cartridge is a rigid air-permeable barrel wall, it has good air-permeable filtration ability, can filter and remove the soot particles in the exhaust gas, and will not be entangled with sewage and sludge, and is easy to clean.

[0009] A top plate is fixedly provided on the upper part of the column section, and a ring-shaped bottom plate is fixedly provided on the lower part. The top chamber is correspondingly provided above the column section and fixed on the top plate. The top plate can block the upper port of the column section. The upper part of the filter cartridge is fixed on the top plate through a connecting sleeve and the upper port of the filter cartridge is extended into the chamber of the top chamber. A top cover is respectively arranged at the upper port of each filter cartridge, and a lifting drive unit corresponding to each top cover is provided on the top chamber. The lifting drive unit can drive the top cover to block the upper port of the filter cartridge and drive the top cover to move above the upper port of the filter cartridge. Support plates are distributed on the bottom plate, and bases corresponding to the lower ports of each filter cartridge are fixed on the support plate. A valve cover unit is provided on the base, which can switch the lower port of the filter cartridge between an open state and a blocked state.

[0010] The flushing pipe assembly includes a flushing pipe, a flushing medium supply unit matched with the upper end of the flushing pipe, and a rotation drive unit matched with the upper part of the flushing pipe and capable of driving the flushing pipe to rotate around a vertical axis. Both the flushing medium supply unit and the rotation drive unit can be fixedly arranged outside the top chamber. The flushing pipe extends downward into the filter cartridge and the lower end is pivotally matched with the base. A plurality of injection holes are distributed on a section of the pipe wall of the flushing pipe corresponding to the effective filter cartridge wall portion on the filter cartridge, that is, injection holes are distributed on the pipe wall of the flushing pipe at a section corresponding to the effective filter cartridge wall portion on the filter cartridge. The jet ejected from the injection hole can be directed obliquely downward.

[0011] When the filter cartridge is in the filtering state, the top cover configured at its upper port is relatively located directly above its upper port, so that the upper port of this part of the filter cartridge is in an open state; the valve cover unit configured at its lower port keeps the lower port of the filter cartridge in a blocked state, and can generate a strong suction force on both sides of the filter cartridge wall.

[0012] For the filter cartridge in the flushing state or in the resting state, the top cover configured at its upper port blocks its upper port, so that the upper port of this part of the filter cartridge is in a closed state. For the filter cartridge in the flushing state, the valve cover unit configured at its lower port keeps the lower port of the filter cartridge in an open state, so that the flushing fluid carrying the sludge flows downward into the cone section; for the filter cartridge in the resting state, the valve cover unit configured at its lower port keeps the lower port of the filter cartridge in a closed state.

[0013] In the technical solution of this application, among the multiple filter cartridges provided, while some filter cartridges are in the filtering operation state, the remaining filter cartridges are either in the state of being flushed or in the resting state. The degree of blockage of the cylinder walls of one or more filter cartridges in the operating state is judged according to the pressure difference situation on both sides of the cylinder walls of the filter cartridges. When it is judged according to the pressure difference that the cylinder walls of the filter cartridges in the filtering operation state have reached the degree of excessive blockage, the operation of this part of the filter cartridges is controlled to stop, and one or more other filter cartridges are switched to the filtering operation state, and at the same time, the filter cartridges that have been in the state of excessive blockage are subjected to backwashing treatment.

[0014] Optionally, a plurality of injection holes distributed on the pipe wall of the flushing pipe extend spirally from top to bottom on the pipe wall of the flushing pipe, and there are staggered parts between the height positions of two adjacent injection holes.

[0015] Optionally, rotary joints are respectively arranged at the upper ends of the flushing pipes, and each branch pipe on the flushing medium input pipe is respectively communicated with each flushing pipe through each rotary joint. A booster pump is provided on each branch pipe.

[0016] Optionally, the lifting drive unit includes a screw cylinder and a first motor. The screw cylinder is fixed on the top chamber and the screw cylinder extends in the vertical direction. A lifting rod is provided at the lower part of the slider arranged in the screw cylinder and the lifting rod extends downward out of the screw cylinder and is fixedly connected with the top cover. The first motor is arranged at the upper end of the screw cylinder and can drive the screw to rotate, so that the slider moves up and down in the screw cylinder, and further realizes the action purpose of driving the top cover to move up and down.

[0017] Optionally, the rotary drive unit includes a gear part arranged on the upper end side of the flushing pipe, a transmission box matched with the gear part, and a second motor matched with the input end of the transmission box. The gear part can be a helical gear to take the characteristics of stable steering and transmission. The transmission box is fixed on the top chamber and after its output end meshes with the gear part, it can drive the flushing pipe to rotate around the vertical axis.

[0018] Optionally, on the upper end surface of the base, a central boss is formed in the central area, and an annular sunk groove is formed around the central boss. The bottom surface of the annular sunk groove is an inclined surface and is an inclined surface that extends downward in the direction from the outer circle to the inner circle. After assembly, the outer circle edge of the annular sunk groove extends to the inner peripheral surface of the lower port of the filter cartridge, and the inner circle edge extends to the outer peripheral surface of the central boss.

[0019] On the base, a plurality of through holes are formed at the position where the central boss is connected with the annular sunk groove and are distributed at intervals in the circumferential direction.

[0020] The valve cover unit includes a plurality of plug blocks respectively corresponding and matching with each through hole, and a transmission mechanism capable of driving each plug block to move up and down synchronously. The transmission mechanism is arranged at the lower part of the base. Along with the transmission mechanism driving the plug blocks to move up and down synchronously, the through holes can be selectively blocked by the plug blocks and kept in an open state.

[0021] Optionally, the transmission mechanism includes a sliding seat and a hydraulic cylinder part. The sliding seat includes a seat body, a plurality of vertical arms with the plug blocks respectively arranged at the upper ends, and a plurality of radial edge arms connecting the seat body and each vertical arm. A bottom surface cylinder is formed at the lower part of the base, and the vertical arms are matched with the bottom surface cylinder through a track structure arranged in the vertical direction, so that the sliding seat can move up and down relative to the bottom surface cylinder or relative to the base in the vertical direction. The hydraulic cylinder part is fixedly arranged in the bottom surface cylinder and the end of its cylinder rod is fixedly connected with the seat body. With the telescopic movement of the cylinder rod of the hydraulic cylinder part, the seat body is driven to move up and down.

[0022] Optionally, the through hole is an arc-shaped through hole, and correspondingly, the plug block is an arc-shaped block.

[0023] The side surface of the plug block facing the through hole is formed as a conical surface part, and the lower end of the conical surface part is farther from the axis line side than its upper end; correspondingly, the outer side surface of the through hole is formed as a conical surface and the conical surface is also in the form that the lower end is farther from the axis line side than the upper end.

[0024] Optionally, a plurality of micropores are distributed and formed on the barrel wall of the filter cartridge, and the aperture size of the micropores is between 1 micron and 10 microns. The pore cavity of the micropores is an incompletely regular or completely irregular void structure.

[0025] The beneficial effects of the present invention are as follows: The present invention can overcome the limitation problems of the existing bag dust removal unit when filtering high-humidity dusty tail gas. The filter cartridge adopted by the present invention has a rigid microporous filter wall, which can not only effectively block the soot particles in the tail gas, but also easily remove the too thick soot layer attached to the filter wall through the reverse flushing method, so that the filter wall of the filter cartridge can be restored to an effective air-permeable filtration state through the reverse flushing means, and the filter cartridge has a long service life, which helps to reduce the operation cost of the furnace tail gas dust removal system. That is, the present invention uses a filter cartridge with a rigid microporous filter wall to replace the filter bag and configures a related flushing unit, which can make the filter cartridge be cyclically restored to an effective dust removal state, overcome the problem that the filtration efficiency rapidly deteriorates and is irreversible due to the entanglement between the filter bag fiber layer and the mud, enable the dust removal tower tank to maintain a stable and reliable dust removal state for a long time, help to improve the dust removal efficiency, and reduce the operation cost. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram in the main view direction of this application.

[0027] Figure 2 Schematic diagram of the front view structure of the flushing pipe.

[0028] Figure 3 Schematic diagram of the bottom view structure of the lead screw cylinder.

[0029] Figure 4 Schematic diagram of the sectional structure when the base and the sliding seat are matched and in the open state.

[0030] Figure 5 Schematic diagram of the sectional structure when the base and the sliding seat are matched and in the blocked state.

[0031] Figure 6 For the base and the sliding seat at Figure 5 Schematic diagram of the bottom view structure in the state shown.

[0032] Figure 7 For the base and the sliding seat at Figure 5 Schematic diagram of the top view structure in the state shown.

[0033] Figure 8 Schematic diagram of the sectional structure of the front view of the base.

[0034] Figure 9 Schematic diagram of the bottom view structure of the base.

[0035] Figure 10 Schematic diagram of the top view structure of the bottom plate.

[0036] In the figure: 10 machine base; 20 tower tank, 21 cylindrical section, 211 tail gas inlet pipe seat, 212 top plate, 213 bottom plate, 214 support plate, 2141 support arm, 2142 clearance area, 2143 hollow area, 22 conical section, 23 valve part; 30 top chamber, 31 exhaust port; 40 filter cartridge, 41 connecting sleeve, 42 top cover, 421 rubber pad, 43 lead screw cylinder, 431 lifting rod, 44 first motor, 441 lead screw, 45 base, 451 central boss, 4511 annular conical surface, 4512 bottom cylindrical body, 4513 guiding hole, 452 annular groove, 453 through hole, 454 plug board, 4541 stud, 46 sliding seat, 461 seat body, 462 vertical arm, 463 plug block, 4631 conical surface part, 4632 inclined surface part, 464 guiding rod, 47 hydraulic cylinder part, 48 end cover; 50 flushing pipe, 51 gear part, 511 transmission box, 512 second motor, 52 shaft end section, 53 injection hole, 54 rotary joint, 55 flushing medium input pipe, 551 branch pipe, 552 booster pump. Detailed implementation manners

[0037] The structures, proportions, sizes, etc. shown in the accompanying drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have any substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, terms such as "upper", "lower", "front", "back", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented.

[0038] Such as Figures 1 to 10 The industrial furnace tail gas dust removal device shown in the figure includes a tower tank 20 and a top chamber 30 fixed on a machine base 10, a plurality of filter cartridges 40 correspondingly arranged in a column cylinder section 21 of the tower tank 20, and a plurality of flushing pipe assemblies correspondingly matched with each of the filter cartridges 40.

[0039] The top chamber 30 is correspondingly arranged above the column cylinder section 21. A tail gas inlet pipe seat 211 is provided on the column cylinder section 21, an exhaust port 31 is provided on the top chamber 30, and a fan is configured on the exhaust port 31. After starting the fan, the chamber of the top chamber 30 can be formed into a negative pressure space. The tail gas generated by the industrial furnace is introduced into the column cylinder section 21 of the tower tank 20 through the tail gas inlet pipe seat 211, the dust in the tail gas is filtered, and the produced dust-free tail gas flows into the top chamber 30 and is conveyed to the outside through the exhaust port 31. A first pressure sensor is provided in the cylinder chamber of the column cylinder section 21, and a second pressure sensor is provided in the top chamber 30 to detect the pressure difference between the dust-containing tail gas side and the dust-free tail gas side. The separated dust particles fall into a cone section 22 at the lower part of the tower tank 20 under the action of gravity, and after accumulating to a certain amount, they are discharged outside the tower tank 20 by opening a valve part 23. The foregoing content in this paragraph belongs to the category of prior art and will not be elaborated herein.

[0040] In the present application, the cylinder wall of the filter cartridge 40 is either made of an inorganic material blank and formed by high-temperature sintering, or made of a metal material through powder metallurgy process, so that the obtained filter cartridge 40 is formed into a rigid cylinder with a large number of microporous structures distributed on the cylinder wall. The filter cartridge 40 not only has good air permeability and filtration performance, but also has an overall rigid structure, making it not easy to entangle with sludge and sewage, and the sludge and sewage invading into the micropores are easy to be washed away.

[0041] The pore size of the micropores is between 1 micron and 10 microns. Since the micropores are produced by sintering technology or powder molding technology, the pore cavities of the micropores are mostly irregular pore structures. It should be noted that the material formula and process for manufacturing the filter cartridge 40 can be specifically realized by those skilled in the art with reference to the firing technology of ceramic filter tubes and in combination with the characteristics of the filtered tail gas, which do not belong to the core technical points of this application, so they will not be elaborated here.

[0042] As Figure 1 shown, a top plate 212 is fixedly provided at the upper part of the columnar cylinder section 21, and an annular bottom plate 213 is fixedly provided at the lower part. And a conical flange capable of contacting and matching with the upper port of the conical cylinder section 22 is formed on the lower end surface of the bottom plate 213. The top plate 212 can block the upper port of the columnar cylinder section 21. The top chamber 30 is fixed on the top plate 212. The upper parts of the filter cartridges 40 are all fixed on the top plate 212 through connecting sleeves 41 and the upper ports of the filter cartridges 40 extend into the top chamber 30. Sealing ring structures are provided between the relative circumferential surfaces between the connecting sleeve 41 and the filter cartridge 40, and between the relative circumferential surfaces between the connecting sleeve 41 and the top plate 212. Lids 42 are respectively arranged at the upper ports of the respective filter cartridges 40 and lifting drive units respectively corresponding to and matching with the respective lids 42 are provided on the top chamber 30. The lifting drive unit can drive the lid 42 to block the upper port of the filter cartridge 40 (see the right filter cartridge 40 in Figure 1 ) and drive the lid 42 to move above the upper port of the filter cartridge 40, so that the upper port of the filter cartridge 40 remains in an open state (see the left filter cartridge 40 in Figure 1 ).

[0043] As Figure 1 、 Figure 10 shown, support plates 214 are distributed on the bottom plate 213, and bases 45 respectively corresponding to and matching with the lower ports of the respective filter cartridges 40 are fixedly provided on the support plates 214. A valve cover unit capable of switching the lower port of the filter cartridge 40 between an open state and a blocked state is provided on the base 45.

[0044] The flushing pipe assembly includes a flushing pipe 50, a flushing medium supply unit matching with the upper part of the flushing pipe 50, and a rotation drive unit matching with the upper part of the flushing pipe 50 and capable of driving the flushing pipe 50 to rotate around the vertical axis. The flushing medium supply unit and the rotation drive unit can both be fixedly arranged outside the top chamber 30, see Figure 1 .

[0045] The flushing pipe 50 extends downward into the filter cartridge 40 and is provided with an axial end section 52 pivotally matched with the base 45 at the lower end. The flushing pipe 50 can be coaxial with the corresponding matching filter cartridge 40. A plurality of injection holes 53 are distributed on a section of the pipe wall of the flushing pipe 50 corresponding to the filter cartridge 40. A rotary joint 54 is arranged at the upper end of the flushing pipe 50, and each branch pipe 551 on the flushing medium input pipe 55 in the flushing medium supply unit is connected to each flushing pipe 50 through the rotary joint 54, that is, the number of branch pipes 551 arranged on the flushing medium input pipe 55 is consistent with the number of flushing pipes 50 arranged and is in a one-to-one matching relationship. A solenoid valve and a booster pump 552 are arranged on each branch pipe 551. By providing a booster pump 552, the backwash jet ejected from the flushing pipe 50 can exert a relatively stronger flushing shear force on the filter cartridge 40, which helps to improve the backwashing effect on sewage and mud adhering to the wall of the filter cartridge 40, ensure the thoroughness of the flushing, and enable the filter cartridge 40 to return to a better filtering state.

[0046] The filter cartridge 40 in the filtering operation state has the top cover 42 disposed at its upper port relatively directly above the upper port, so that the upper port of the filter cartridge 40 is in an open state; the valve cover unit disposed at its lower port keeps the lower port of the filter cartridge 40 in a blocked state, see Figure 1 The left filter cartridge 40 in the middle. The top cover 42 configured at the upper port of the filter cartridge 40 in the flushing state or the resting state blocks its upper port, so that the upper port of this part of the filter cartridge 40 is in a closed state. At the same time, according to different situations, the valve cover unit configured at the lower port of the filter cartridge 40 in the flushing state keeps the lower port of the filter cartridge 40 in an open state, so that the flushing fluid can flow downward out of the filter cartridge 40 and fall into the cone section 22, see Figure 1 The right filter cartridge 40 and Figure 4 The filter cartridge 40 is in a dormant state, and the valve cover unit is configured at its lower port so that the lower port of the filter cartridge 40 remains in a closed state, see Figure 1 The right filter cartridge 40 and Figure 5 .

[0047] In this application, a plurality of filter cartridges 40 are provided such that while some of the filter cartridges 40 are in the filtering operation state, the remaining filter cartridges 40 are either in the flushing state or in the rest state. The degree of blockage of the cylinder walls of one or more filter cartridges 40 in the operating state is judged according to the pressure difference between the first pressure sensor and the second pressure sensor. If it is judged according to the pressure difference that the cylinder walls of the filter cartridges 40 in the operating state have reached an excessive blockage degree, then the operation of this part of the filter cartridges 40 is controlled to stop, and one or more other filter cartridges 40 are switched to the filtering operation state. At the same time, the filter cartridges 40 that have reached the excessive blockage state can be subjected to backwashing treatment, and after the treatment is completed, this part of the filter cartridges 40 is changed back to the rest state.

[0048] As Figure 2 shown, a plurality of injection holes 53 are distributed on the tube wall of the flushing tube 50, spirally extending and distributing from top to bottom on the tube wall of the flushing tube 50, and there are overlapping parts between the height positions of two adjacent injection holes 53. Refer to Figure 2 shown, between two adjacent injection holes 53, the height position of the lower part of the injection hole 53 on the upstream side relative to the spiral extension direction is in the same height section as the height position of the upper part of the injection hole 53 on the downstream side relative to the spiral extension direction. Such a design can prompt the ejected flushing jet to fully cover the entire filter wall of the filter cartridge 40 along with the rotation action of the flushing tube 50, which helps to fully and comprehensively flush the filter cartridge 40.

[0049] As Figures 1 to 2 shown, the upper end of the flushing tube 50 extends outside the top wall of the top chamber 30, and then the rotary joint 54 is arranged at the upper end and is respectively and correspondingly connected to each branch pipe 551 provided on the flushing medium input pipe 55, so as to selectively convey the backwashing medium (liquid medium or gas-liquid mixed medium) to each flushing tube 50 and eject the flushing jet. The rotary drive unit includes a gear portion 51 provided on the upper end side of the flushing tube 50 (selected as a helical gear in the Figure 2 shown scheme), a transmission box 511 fixedly provided on the top wall of the top chamber 30, and a second motor 512 matched with the input end of the transmission box 511. The rotary joint 54 is relatively arranged above the gear portion 51. The output end of the transmission box 511 is matched with the gear portion 51. The second motor 512 can drive the flushing tube 50 to rotate around the vertical axis through the transmission box 511.

[0050] The filter cartridge 40 in the present invention has a side wall as a filtering wall surface, and it is a rigid microporous filter wall with irregular micropores densely distributed on the wall. The filter wall or the main body of the filter cartridge 40 can be made of inorganic materials such as silicon dioxide, aluminum oxide, zirconium oxide or titanium oxide to form a blank and then sintered at high temperature; it can also be made by powder metallurgy using relevant metal materials. The wall thickness of the filter cartridge 40 is generally controlled within 15 mm, preferably within 10 mm. The micropores (or microporous structure) on it are voids naturally formed during the sintering process, and the pore size can be controlled by adjusting the material formula and the manufacturing process parameters. When the wall thickness of the filter cartridge 40 is relatively thin, a support skeleton structure can be arranged inside it to ensure the strength of the filter cartridge 40. It should be noted that the manufacturing material of the filter cartridge 40 should be matched with the properties of the backwashing medium, the properties of the soot, etc., to avoid chemical reactions between the filter cartridge 40 and the backwashing medium, chemical reactions with combustion exhaust gas, and adverse phenomena such as wetting effects between the filter cartridge 40 and the backwashing medium. The pore size of the micropores on the filter wall of the filter cartridge 40 needs to be determined according to the actual situation such as the particle diameter of the soot in the high-humidity dusty exhaust gas and the limit requirements of the soot emission concentration, and is generally controlled between 1 micron and 10 microns. To reduce the manufacturing cost, the cross-section of the filter cartridge 40 preferably adopts a circular structure, but it can also adopt a filter cartridge 40 with a cross-section of other geometric shapes according to the actual operating environment, special requirements, etc. The barrel wall / filter wall part of the filter cartridge 40 generally needs to be able to withstand a pressure of more than 1 MPa.

[0051] Such as Figure 1 , Figure 3As shown, the lifting drive unit includes a screw cylinder 43 and a first motor 44. A slider matching with the screw rod 441 is arranged in the screw cylinder 43 to form a screw-screw rod slider transmission mechanism. The screw cylinder 43 is fixed on the top wall of the top chamber 30, and the upper end of the screw cylinder 43 extends upward relative to the top wall of the top chamber 30 by a certain length, and the lower end of the screw cylinder 43 extends downward relative to the top wall of the top chamber 30 into the top chamber 30 by a certain length. A lifting rod 431 is arranged at the lower part of the slider arranged in the screw cylinder 43, and after the lifting rod 431 extends downward out of the screw cylinder 43, it is fixedly connected with the top cover 42. A through-hole structure for the lifting rod 431 to pass through is arranged on the bottom end plate of the screw cylinder 43. The first motor 44 is arranged at the upper end of the screw cylinder 43 and can drive the screw rod 441 to rotate around the vertical axis, and then can drive the slider to move up and down in the screw cylinder 43, so as to achieve the purpose of driving the top cover 42 to move up and down. A rubber pad 421 is arranged on the end face of the top cover 42 facing the upper port of the filter cartridge 40, so that when the top cover 42 presses on the upper port of the filter cartridge 40, the rubber pad 421 can fully seal the upper port of the filter cartridge 40.

[0052] As Figures 4 to 9 As shown, on the upper end face of the base 45, a central boss 451 is formed in the central area, and an annular sunk groove 452 is formed on the periphery of the central boss 451. The bottom surface of the annular sunk groove 452 is an inclined surface and is an inclined surface extending downward in the direction from the outer circle to the inner circle of (the annular sunk groove 452). After assembly, the outer circle edge of the annular sunk groove 452 extends to the inner peripheral surface of the lower port of the filter cartridge 40, and the inner circle edge extends to the outer peripheral surface of the central boss 451. The shaft end section 52 matches with the shaft hole structure arranged on the central boss 451, so that the flushing pipe 50 can rotate relative to the central boss 451. On the base 45, four through holes 453 are formed at the position where the central boss 451 is connected with the annular sunk groove 452 and are distributed at intervals in the circumferential direction, and the through holes 453 are formed as arc-shaped through holes. The valve cover unit includes four plug blocks 463 respectively corresponding to and matching with the through holes 453, and a transmission mechanism capable of driving the plug blocks 463 to move up and down synchronously. The transmission mechanism is arranged at the lower part of the base 45.

[0053] With the above structure, when backwashing the barrel wall of the filter cartridge 40, the generated sewage can converge in the annular sink 452 and quickly flow downward through the through hole 453 into the conical barrel section 22, effectively preventing excessive accumulation and sedimentation of sewage at the joint position between the upper end of the base 45 and the lower end of the filter cartridge 40, and ensuring the cleanliness of the barrel wall at the lower end of the filter cartridge 40. Further, to reduce the obvious accumulation and sedimentation of sewage on the upper end surface of the central boss 451, the edge of the upper end surface of the central boss 451 can be formed into an annular conical surface 4511, and the annular conical surface 4511 extends downward obliquely from the inside to the outside. At the same time, the upper end surface of the plug 463 is formed into an inclined surface portion 4632, and the lower end of the inclined surface portion 4632 is opposite to the lower end of the annular sink 452.

[0054] The transmission mechanism includes a sliding seat 46 and a hydraulic cylinder part 47. The sliding seat 46 includes a seat body 461, a plurality of vertical arms 462 each provided with the plug 463 at the upper end, and a plurality of radial edge arms connecting the seat body 461 and each vertical arm 462. There is a one-to-one matching relationship between the vertical arm 462 and the plug 463, and there is also a one-to-one matching relationship between the radial edge arm and the vertical arm 462. Correspondingly, a bottom surface cylinder 4512 extending vertically downward is formed at the lower part of the base 45, and the vertical arm 462 and the bottom surface cylinder 4512 are matched through a track structure arranged in the vertical direction. As Figures 4 to 5 shown, the relative surfaces between the upper end of the vertical arm 462 (i.e., the section where the plug 463 is configured) and the bottom surface cylinder 4512 are in a form-fit contact relationship. To ensure the guiding effect, a guiding rod 464 is provided on the radial edge arm, and a guiding hole 4513 corresponding to the guiding rod 464 one by one is provided on the bottom surface cylinder 4512. On the bottom surface cylinder 4512, a cavity extending vertically upward is formed at its lower end surface, and the hydraulic cylinder of the hydraulic cylinder part 47 is fixedly arranged in the cavity, so that the hydraulic cylinder part 47 and the bottom surface cylinder 4512 are connected as a whole. An end cover 48 is provided at the port of the cavity, and a shaft hole for the cylinder rod of the hydraulic cylinder to extend out is formed on the end cover 48 (this shaft hole corresponds to and matches the root of the cylinder rod of the hydraulic cylinder). The end of the cylinder rod of the hydraulic cylinder part 47 is fixedly connected to the seat body 461. As the cylinder rod of the hydraulic cylinder part 47 makes a telescopic movement, it can lift the seat body 461 or the sliding seat 46 to move up and down in the vertical direction, and control the synchronous movement of the plug 463 to alternately block the through hole 453 and keep the through hole 453 in a conductive state.

[0055] To improve the sealing effect between the plug block 463 and the relative peripheral surface / arc surface of the through hole 453, so that the relative surfaces of the two can still maintain a good sealing state after long-term use, and reduce the energy consumption caused by air leakage. In the top view direction, the through hole 453 is an arc-shaped through hole, and the plug block 463 is an arc-shaped block. The side surface of the plug block 463 facing the through hole 453 is formed into a tapered surface portion 4631, and the lower end of the tapered surface portion 4631 is farther from the axis line of the central boss 451 than the upper end. The outer side surface of the through hole 453 is formed into a tapered surface and is also in the form that the lower end is farther from the axis line of the central boss 451 than the upper end. In this way, the tapered surface portion 4631 can establish a relationship of forming surface contact and matching with the outer side surface of the through hole 453, and sludge is not easily hung on the hole wall of the through hole 453. The inner side surface of the through hole 453 can be understood as the outer peripheral surface of the central boss 451 or the outer peripheral surface of the bottom column body 4512. In Figure 4 In the shown embodiment, the outer peripheral surface of the central boss 451 and the outer peripheral surface of the upper part of the bottom column body 4512 are on the same cylindrical surface.

[0056] As Figures 4 to 10 shown, on the lower end surface of the base 45, plug plate groups are oppositely distributed on both sides in the diameter direction, and each plug plate group includes at least three plug plates 454, and the plug plates 454 in the same group are distributed at intervals. One or two support plates 214 (see Figure 10 the shown scheme) are formed on the bottom plate 213 in the diameter direction, and a support arm group corresponding to and matching the two opposite plug plate groups is formed on the support plate 214.

[0057] The support arm group includes two pairs of support arms 2141, and the four support arms 2141 are distributed oppositely at the four corner positions of a square. Gap areas 2142 are formed on the support arms 2141 and between the opposite ends of two adjacent and opposite support arms 2141. The plug plate 454 can pass downward through the gap area 2142, and then the base 45 is relatively fixed on the bottom plate 213 by the stud 4541 provided on the plug plate 454. A hollow area 2143 is formed between the two pairs of support arms 2141 in the same group to allow the bottom column body 4512 and the slide base 46 to pass downward through the support plate 214, forming a clearance space. Figures 4 to 9 In the shown scheme, only one support plate 214 needs to be configured, and a support arm group corresponding to and matching the two plug plate groups respectively is configured on the support plate 214. Figure 10 In the shown scheme, two pairs of plug plate groups need to be configured on the base 45, and one pair of plug plate groups is correspondingly configured on each support plate 214.

[0058] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. There are many aspects of the present invention that can be improved without departing from the overall concept. Those familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those of ordinary skill in the art within the spirit and technical concept disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An industrial furnace tail gas dust removal device, comprising a tower tank (20) fixed on a machine base (10) and a top chamber (30); characterized in that: It also includes a plurality of filter cartridges (40) arranged in the column section (21) of the tower tank (20) and a plurality of flushing pipe assemblies corresponding to the filter cartridges (40); the cylinder wall of the filter cartridge (40) is made of an inorganic material blank and sintered at high temperature, or made of a metal material and through a powder metallurgy process, and is a rigid and breathable cylinder wall; A top plate (212) is provided at the upper part of the column section (21), and a bottom plate (213) is provided at the lower part; the top plate (212) seals the upper port of the column section (21) and is fixedly matched with the upper part of the filter cartridge (40); a top cover (42) is arranged at the upper port of the filter cartridge (40), and a lifting drive unit corresponding to each top cover (42) is provided on the top chamber (30); the lifting drive unit can drive the top cover (42) to seal the upper port of the filter cartridge (40) and drive the top cover (42) to move above the upper port of the filter cartridge (40); a support plate (214) is provided on the bottom plate (213), and a base (45) matching with the lower port of the filter cartridge (40) is provided on the support plate (214); a valve cover unit capable of switching the lower port of the filter cartridge (40) between an open state and a blocked state is provided on the base (45); The flushing pipe assembly comprises a flushing pipe (50), a flushing medium supply unit matched with the upper end of the flushing pipe (50), and a rotation drive unit matched with the upper part of the flushing pipe (50) and capable of driving the flushing pipe (50) to rotate around a vertical axis; a plurality of injection holes (53) are distributed on a section of the wall of the flushing pipe (50) extending into the filter cartridge (40); A central boss (451) is formed in the central area of ​​the upper end surface of the base (45), and an annular recessed groove (452) is formed on the periphery of the central boss (451); the bottom surface of the annular recessed groove (452) is an inclined surface and is inclined downward in the direction from the outer circle to the inner circle; the outer circle edge of the annular recessed groove (452) extends to the inner circumferential surface of the lower port of the filter cartridge (40), and the inner circle edge extends to the outer circumferential surface of the central boss (451); on the base (45), a plurality of through holes (453) distributed alternately in the circumferential direction are formed at the position where the central boss (451) and the annular recessed groove (452) are connected; The valve cover unit comprises a plurality of plugs (463) respectively corresponding to the through holes (453), and a transmission mechanism capable of driving the plugs (463) to move synchronously up and down, and the transmission mechanism is arranged at the lower part of the base (45).

2. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: A plurality of spray holes (53) are distributed on the wall of the flushing pipe (50), extending spirally from top to bottom on the wall of the flushing pipe (50), and there is an interlacing between the height positions of two adjacent spray holes (53).

3. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: A rotary joint (54) is disposed at the upper end of each flushing pipe (50); each branch pipe (551) on the flushing medium input pipe (55) in the flushing medium supply unit is connected to each flushing pipe (50) via the rotary joint (54); and each branch pipe (551) is provided with a booster pump (552).

4. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: The lifting drive unit comprises a screw cylinder (43) and a first motor (44); the screw cylinder (43) is fixed on the top chamber (30) and extends in the vertical direction; a lifting rod (431) is provided at the lower part of the slider arranged in the screw cylinder (43), and the lifting rod (431) extends downward out of the screw cylinder (43) and is fixedly connected to the top cover (42); the first motor (44) is arranged at the upper end of the screw cylinder (43) and can drive the screw (441) to rotate, so that the slider moves up and down in the screw cylinder (43).

5. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: The rotation driving unit comprises a gear portion (51) arranged on the upper part of the flushing pipe (50), a transmission box (511) matched with the gear portion (51), and a second motor (512) matched with the input end of the transmission box (511); the transmission box (511) is fixed on the top chamber (30) and its output end is meshed with the gear portion (51), so as to drive the flushing pipe (50) to rotate.

6. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: The transmission mechanism comprises a sliding seat (46) and a hydraulic cylinder part (47); the sliding seat (46) comprises a seat body (461), a plurality of vertical arms (462) each having a plug block (463) at its upper end, and a plurality of radial edge arms connecting the seat body (461) and the vertical arms (462); A bottom column (4512) is formed at the lower part of the base (45), and the vertical arm (462) and the bottom column (4512) are matched via a track structure arranged in a vertical direction; the hydraulic cylinder part (47) is fixedly arranged in the bottom column (4512) and the end of the cylinder rod is fixedly connected to the seat body (461).

7. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: The through hole (453) is an arc-shaped through hole, and correspondingly the plug block (463) is an arc-shaped block; the side of the plug block (463) facing the through hole (453) is formed into a conical surface (4631), and the lower end of the conical surface (4631) is away from the axial center line side relative to the upper end; correspondingly, the outer side surface of the through hole (453) is formed into a conical surface and is also in a form in which the lower end is away from the axial center line side relative to the upper end.

8. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: The pore size of the micropores distributed on the wall of the filter cartridge (40) is between 1 micron and 10 microns.

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