Industrial furnace tail gas dust removal device

Abstract

The invention belongs to the technical field of tail gas dust removal, and particularly relates to an industrial furnace tail gas dust removal device which comprises a tower tank, a top bin, a filter cartridge and a flushing pipe assembly. The filter cartridge is made in such a way that the cartridge wall is a rigid wall in which micropores are distributed. And a support plate is arranged at the lower part of the column casing section of the tower tank. A top cover is arranged at the upper end opening of the filter cartridge, and a lifting driving unit matched with the top cover is arranged on the top bin chamber, so that the top cover can block the upper end opening of the filter cartridge in a switchable manner and open the upper end opening. The support plate is provided with a base matched with the lower port of the filter cartridge. And the base is provided with a valve cover unit capable of switching the lower port of the filter cartridge between an open state and a blocked state. A flushing pipe of the flushing pipe assembly can rotate around the vertical axis, and a plurality of spraying holes are formed in the pipe wall of the section, extending into the filter cylinder, of the flushing pipe. The filter cartridge provided by the invention has a rigid filter wall, and a sludge layer on the filter wall can be removed by a back flushing means, so that the breathable filtering capacity of the filter cartridge is continuously recovered.

Description

Technical Field

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

[0002] Industrial furnaces that use hydrocarbons and hydrogen as fuel have a high content of water vapor in their tail gas. For example: 1) For furnaces that use natural gas (mainly methane) as fuel, if they are burned in air, the volume fraction of water vapor in their tail gas is about 19%; if they are burned in pure oxygen, the volume fraction of water vapor in their tail gas can be as high as about 66.7%; 2) For furnaces that use liquefied petroleum gas (mainly propane) as fuel, if they are burned in air, the volume fraction of water vapor in their tail gas is about 15.5%; if they are burned in pure oxygen, the volume fraction of water vapor in their tail gas can be as high as about 57.1%; 3) For furnaces that use hydrogen as fuel, if they are burned in air, the volume fraction of water vapor in their tail gas is about 34.7%; if they are burned in pure oxygen, the volume fraction of water vapor in their tail gas can even be as high as 100%.

[0003] In the current industrial furnace exhaust gas treatment system, dry dust removal devices are widely used. The dust removal principle of the bag dust removal unit is as follows: when the dust-containing exhaust gas passes through the fiber layer on the bag wall of the filter bag, a sieving phenomenon occurs, a mechanical collision occurs between the dust particles and the bag wall, and electrostatic adsorption occurs between the fibers of the bag wall and the dust particles. Under the influence of physical effects such as gravity and diffusion, the purpose of filtering and separating dust particles in the exhaust gas is achieved. The working process of the bag dust removal unit is as follows: when the dust-containing exhaust gas passes through the bag wall fiber layer of the filter bag, large particles of dust collide with the bag wall and are blocked outside the filter bag, and fall into the cone section set at the bottom of the dust removal tower tank (referred to as the tower tank) under the action of gravity. Some small fine dust particles enter the fiber mesh of the bag wall and are blocked. As more and more dust particles are blocked and adhere to the outer surface of the filter bag, small 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, over a long period of time, as the dust thickness on the surface of the filter bag continues to increase, the dust removal efficiency of the bag-type dust removal unit increases accordingly, and the resistance of the dust-containing exhaust gas to the fiber layer of the filter bag wall is also increasing. When the pressure on both sides of the filter bag fiber layer (i.e., the inner and outer sides of the bag wall of the filter bag) increases to a certain extent, the ventilation volume of the dust removal unit will drop significantly. At that time, it is necessary to start the dust removal unit to remove the dust covering the surface of the filter bag through mechanical vibration and / or air flow backblowing and other dust removal measures. Therefore, at least two sets of bag-type dust removal units need to be set in the tower tank, and while some are in the operating state of filtering dust in the exhaust gas, the remaining part is in the dust removal / ash cleaning operating state. Finally, by continuously switching the operating state between the two parts of the dust removal unit, the dust removal tower tank is kept in a continuous dust removal operating state.

[0004] However, when the bag filter mentioned above is used to filter smoke with high humidity combustion exhaust characteristics, the conductivity of the water contained in the exhaust gas will make the electrostatic adsorption characteristics between the filter bag fibers and fine smoke / dust particles and between fine smoke particles ineffective, which greatly reduces the adsorption and dust removal ability of the filter bag; in addition, the water in the combustion exhaust gas is also very easy to condense on the fiber layer of the filter bag, and it is easy to mix with the smoke particles in the exhaust gas to form muddy water and mud. Because there is a strong entanglement between the flexible fibers that constitute the filter layer of the filter bag and the sewage and sludge, no matter whether it is a mechanical vibration method or an airflow backblowing method, the current commonly used cleaning measures cannot effectively remove the mud and dirt entangled on the flexible fiber layer of the filter bag, and cannot keep the filter bag in a good filtering efficiency state for a long time. Therefore, the frequency of filter bag replacement is relatively high, which greatly increases the operating cost of the dust removal system, and the limitations of applicability are more significant. Summary of the invention

[0005] The present invention provides an industrial furnace exhaust dust removal device, which uses a filter cartridge with a rigid filter wall, and can remove the dirt layer attached to the filter wall through backwashing measures, so that the filter wall of the filter cartridge can be continuously restored to an effective air permeable filtering state. The air permeable filtering ability of the filter cartridge has good cyclic recovery characteristics, so that it has a long service life, which helps to reduce the operating cost of the furnace exhaust dust removal system.

[0006] The technical solution adopted by the present invention to solve its technical problem is: an industrial furnace exhaust 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 arranged on the exhaust port. When the fan is started, a negative pressure space can be formed in the chamber cavity of the top chamber, thereby achieving the purpose of sucking and filtering the exhaust gas.

[0008] The filter cartridge wall is made of inorganic materials and sintered at high temperature, or made of metal materials and powder metallurgy, which can be formed into a rigid wall with air permeability and filtration performance, that is, the filter cartridge is formed into a rigid cylinder with numerous micropores distributed on its wall. Because the filter cartridge wall is a rigid air permeable wall, it has good air permeability and filtration ability, can filter and remove smoke 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 the present application, among the multiple filter cartridges, some of the filter cartridges are in a filtering operation state while the remaining filter cartridges are either in a flushing state or in a rest state. The degree of blockage of the cylinder wall of one or more filter cartridges in operation is determined based on the pressure difference on both sides of the cylinder wall of the filter cartridge. When it is determined based on the pressure difference that the cylinder wall of the filter cartridge in the filtering operation state has reached the degree of excessive blockage, the operation of the part of the filter cartridge is controlled to stop, and the other one or more filter cartridges are switched to the filtering operation state, and the filter cartridge that is in the excessive blockage state is backwashed.

[0014] Optionally, the plurality of injection holes distributed on the pipe wall of the flushing pipe are distributed and extended spirally from top to bottom on the pipe wall of the flushing pipe, and there is an interlaced portion between the height positions of two adjacent injection holes.

[0015] Optionally, a rotary joint is disposed at the upper end of the flushing pipe, and each branch pipe on the flushing medium input pipe is connected to each flushing pipe through each rotary joint. A booster pump is disposed 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 extends in the vertical direction. A lifting rod is provided at the lower part of the slider in the screw cylinder, and the lifting rod extends downward out of the screw cylinder and is fixedly connected to 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, thereby achieving the purpose of driving the top cover to move up and down.

[0017] Optionally, the rotation drive unit includes a gear portion provided on the upper end side of the flushing pipe, a transmission box matched with the gear portion, and a second motor matched with the input end of the transmission box. The gear portion can be a helical gear to take advantage of its steering and transmission stability characteristics. The transmission box is fixed on the top chamber and its output end is meshed with the gear portion, which can drive the flushing pipe to rotate around the vertical axis.

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

[0019] On the base, a plurality of through holes distributed alternately around the circumference are formed at the position where the central boss and the annular sink groove are connected.

[0020] The valve cover unit includes a plurality of plugs corresponding to each through hole, and a transmission mechanism capable of driving each plug to move synchronously up and down. The transmission mechanism is arranged at the lower part of the base. With the transmission mechanism driving the plug to move synchronously up and down, the through hole can be switched to be blocked by the plug or to be kept in an open state.

[0021] Optionally, the transmission mechanism includes a slide and a hydraulic cylinder. The slide includes a seat body, a plurality of vertical arms with the plugs respectively disposed at the upper ends, and a plurality of radial edge arms connecting the seat body and the vertical arms. A bottom cylinder is formed at the lower part of the base, and the vertical arms and the bottom cylinder are matched with a track structure arranged in the vertical direction, so that the slide can be lifted and moved in the vertical direction relative to the bottom cylinder or relative to the base. The hydraulic cylinder is fixedly disposed in the bottom cylinder and the end of its cylinder rod is fixedly connected to the seat body. As the cylinder rod of the hydraulic cylinder is extended and retracted, the seat body is driven to be lifted and moved.

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

[0023] The side of the plug toward the through hole is formed into a conical surface, and the lower end of the conical surface is farther away from the axis side relative to its upper end; correspondingly, the outer side of the through hole is formed into a conical surface, and the lower end of the conical surface is also farther away from the axis side relative to the upper end.

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

[0025] The beneficial effect of the present invention is that the present invention can overcome the limitation problem of the existing bag-type dust removal unit when filtering high-humidity dust-containing exhaust gas. The filter cartridge used in the present invention has a rigid microporous filter wall, which can not only effectively block the smoke and dust particles in the exhaust gas, but also easily remove the excessively thick smoke and dust layer attached to the filter wall by backwashing, so that the filter wall of the filter cartridge can be restored to an effective air-permeable filtering state by backwashing, and the filter cartridge has a longer service life, which helps to reduce the operating cost of the furnace exhaust dust removal system. That is, the present invention uses a filter cartridge with a rigid microporous filter wall instead of a filter bag, and is equipped with an associated flushing unit, which can restore the filter cartridge cycle to an effective dust removal state, overcome the problem of rapid and irreversible deterioration of filtration efficiency caused by the entanglement between the fiber layer of the filter bag and the mud, so that the dust removal tower tank can be maintained in a stable and reliable dust removal state for a long time, which helps to improve the dust removal efficiency and reduce the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the main viewing structure of this application.

[0027] Figure 2 This is a schematic diagram of the main structural view of the flushing pipe.

[0028] Figure 3 This is a schematic diagram of the structure of the screw cylinder from a bottom-up perspective.

[0029] Figure 4 It is a schematic diagram of the cross-sectional structure when the base and the slide are matched and in the open state.

[0030] Figure 5 It is a schematic diagram of the cross-sectional structure after the base and the slide are matched and in a blocked state.

[0031] Figure 6 For the base and the slide Figure 5 Schematic diagram of the structure viewed from above in the state shown.

[0032] Figure 7 For the base and the slide Figure 5 Schematic diagram of the top view structure of the state shown.

[0033] Figure 8 This is a schematic diagram of the main cross-sectional structure of the base.

[0034] Fig. 9 This is a schematic diagram of the structure of the base viewed from above.

[0035] Fig.10 A schematic diagram of the top view of the base plate.

[0036] In the figure: 10 base; 20 tower tank, 21 column section, 211 tail gas inlet pipe seat, 212 top plate, 213 bottom plate, 214 support plate, 2141 bracket arm, 2142 gap area, 2143 hollow area, 22 cone section, 23 valve part; 30 top chamber, 31 exhaust port; 40 filter cartridge, 41 connecting sleeve, 42 top cover, 421 rubber pad, 43 screw cylinder, 431 lifting rod, 44 first motor, 441 screw, 45 base, 451 center boss, 4511 annular cone, 451 2 bottom cylinder, 4513 guide hole, 452 annular groove, 453 through hole, 454 plug plate, 4541 stud, 46 sliding seat, 461 seat body, 462 vertical arm, 463 plug block, 4631 conical surface, 4632 inclined surface, 464 guide 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 DESCRIPTION

[0037] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0038] like Figures 1 to 10 The industrial furnace exhaust dust removal device shown 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 the column section 21 of the tower tank 20, and a plurality of flushing pipe assemblies corresponding one-to-one with each of the filter cartridges 40.

[0039] The top chamber 30 is correspondingly arranged above the column section 21. An exhaust gas inlet pipe seat 211 is provided on the column section 21, an exhaust port 31 is provided on the top chamber 30, and a fan is arranged on the exhaust port 31. After starting the fan, the chamber cavity of the top chamber 30 can be formed into a negative pressure space. The exhaust gas generated by the industrial furnace is introduced into the column section 21 of the tower tank 20 through the exhaust gas inlet pipe seat 211, the dust in the exhaust gas is filtered, and the dust-free exhaust gas produced flows into the top chamber 30 and is transported to the outside through the exhaust port 31. A pressure sensor 1 is provided in the cylinder cavity of the column section 21, and a pressure sensor 2 is provided in the top chamber 30 to detect the pressure difference between the dust-containing exhaust gas side and the dust-free exhaust gas side. The separated dust particles fall into the conical cylinder section 22 at the bottom of the tower tank 20 under the action of gravity, and after accumulating to a certain amount, they are discharged out of the tower tank 20 by opening the valve section 23. The above contents in this paragraph belong to the scope of the prior art, so they are not repeated here.

[0040] In the present application, the wall of the filter cartridge 40 is made of inorganic materials and sintered at high temperature, or made of metal materials and made by powder metallurgy, so that the filter cartridge 40 is formed into a rigid type cylinder with numerous microporous structures distributed on the wall. The filter cartridge 40 not only has good air permeability and filtering performance, but also has a rigid structure as a whole, so that it is not easy to get entangled with sludge and sewage, and the sludge and sewage that invade the micropores can be easily cleaned.

[0041] The pore size of the micropores is between 1 micron and 10 microns. Because the micropores are made by sintering technology or powder molding technology, the pores 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 implemented by those skilled in the art by referring to the firing technology of ceramic filter tubes and combining the characteristics of filtering exhaust gas. It does not belong to the technical core point of this application, so it will not be repeated.

[0042] like Figure 1 As shown, a top plate 212 is fixedly provided on the upper part of the column section 21, and a ring-shaped bottom plate 213 is fixedly provided on the lower part, and a conical flange capable of contacting and matching with the upper port of the conical 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 column section 21. The top chamber 30 is fixed on the top plate 212. The upper part of the filter cartridge 40 is fixed on the top plate 212 through a connecting sleeve 41 and the upper port of the filter cartridge 40 is extended into the top chamber 30. A sealing ring structure is 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. A top cover 42 is respectively arranged at the upper port of each filter cartridge 40, and a lifting drive unit corresponding to and matching each top cover 42 is provided on the top chamber 30. The lifting drive unit can drive the top cover 42 to block the upper port of the filter cartridge 40 (see Figure 1 The top cover 42 is moved to the upper portion of the filter cartridge 40, and the upper portion of the filter cartridge 40 is kept in an open state (see Figure 1 The left filter cartridge 40 in FIG.

[0043] like Figure 1 , Fig.10 As shown, support plates 214 are distributed on the bottom plate 213, and bases 45 corresponding to the lower ports of each filter cartridge 40 are fixed on the support plate 214. A valve cover unit is provided on the base 45 to switch the lower port of the filter cartridge 40 between an open state and a blocked state.

[0044] The flushing pipe assembly includes a flushing pipe 50, a flushing medium supply unit matched with the upper portion of the flushing pipe 50, and a rotation drive unit matched with the upper portion of the flushing pipe 50 and capable of driving the flushing pipe 50 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 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 the present application, multiple filter cartridges 40 are provided so that while some of the filter cartridges 40 are in a filtering operation state, the remaining filter cartridges 40 are either in a flushing state or in a rest state. The degree of blockage of the cylinder wall of one or more filter cartridges 40 in the operating state is determined based on the pressure difference between the pressure sensor 1 and the pressure sensor 2. If it is determined based on the pressure difference that the cylinder wall of the filter cartridge 40 in the operating state has reached the degree of excessive blockage, the operation of the part of the filter cartridge 40 is controlled to stop, and the other one or more filter cartridges 40 are switched to the filtering operation state. At the same time, the filter cartridge 40 that is in an excessively blocked state can be backwashed, and after the treatment is completed, the part of the filter cartridge 40 is switched to a rest state.

[0048] like Figure 2 As shown, a plurality of injection 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 a staggered / overlapped portion between the height positions of two adjacent injection holes 53. Figure 2 As shown, between two adjacent injection holes 53, the height position of the lower part of the injection hole 53 on the upstream side of the spiral extension direction and the height position of the upper part of the injection hole 53 on the downstream side of the spiral extension direction are in the same height section. Such a design can enable the flushing jet to fully cover the entire filter wall of the filter cartridge 40 along with the rotation of the flushing pipe 50, which helps to fully and comprehensively flush the filter cartridge 40.

[0049] like Figure 1 to Figure 2 As shown, the upper end of the flushing pipe 50 extends to the outside of the top wall of the top chamber 30, and then the rotary joint 54 is arranged at the upper end, and is respectively connected to each branch pipe 551 provided on the flushing medium input pipe 55, so that the backwashing medium (liquid medium or gas-liquid mixed medium) can be selectively delivered to each flushing pipe 50 to spray out a flushing jet. The rotary drive unit includes a gear part 51 (at the upper end side of the flushing pipe 50) Figure 2 In the scheme shown, a helical gear is selected), a transmission box 511 is fixedly provided on the top wall of the top chamber 30, and a second motor 512 is matched with the input end of the transmission box 511. The rotary joint 54 is relatively arranged above the gear part 51. The output end of the transmission box 511 is matched with the gear part 51. The second motor 512 can drive the flushing pipe 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 which is a filter wall surface and a rigid microporous filter wall, on which (irregular) micropores are densely distributed. The filter wall or body of the filter cartridge 40 can be made of inorganic materials such as silicon dioxide, aluminum oxide, zirconium oxide or titanium oxide, and sintered at high temperature; it can also be made of relevant metal materials using a powder metallurgy process. The wall thickness of the filter cartridge 40 is generally controlled within the range of 15 mm, preferably within the range of 10 mm. The micropores (or microporous structures) thereon are gaps naturally formed during the sintering process, and the pore size can be controlled by adjusting the material formula and adjusting the manufacturing process parameters. When the wall thickness of the filter cartridge 40 is relatively thin, a supporting skeleton structure can be set therein to ensure the strength of the filter cartridge 40. It should be noted that the material used to make the filter cartridge 40 should match the properties of the recoil medium and the properties of the smoke, so as to avoid the phenomenon that the filter cartridge 40 chemically reacts with the recoil medium and the combustion exhaust gas, and avoids the unfavorable phenomena such as the wetting effect between the filter cartridge 40 and the recoil medium. The size of the micropores on the filter wall of the filter cartridge 40 needs to be determined based on the actual conditions such as the particle diameter of the smoke in the high-humidity dust-containing exhaust gas and the limit requirements of the smoke emission concentration, and is generally controlled between 1 micron and 10 microns. In order to reduce manufacturing costs, the cross-section of the filter cartridge 40 preferably adopts a circular structure, but a filter cartridge 40 with a cross-section of other geometric shapes can also be used according to the actual operating environment, special requirements, etc. The cylinder wall / filter wall portion of the filter cartridge 40 is generally required to be able to withstand a pressure of more than 1MPa.

[0051] like Figure 1 , Figure 3As shown, the lifting drive unit includes a screw cylinder 43 and a first motor 44. A slider matching the screw 441 is arranged in the screw cylinder 43 to form a screw 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 to a certain length relative to the top wall of the top chamber 30, and the lower end of the screw cylinder 43 extends downward to a certain length inside the top chamber 30 relative to the top wall of the top chamber 30. A lifting rod 431 is provided 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 to the top cover 42. A through hole structure for the lifting rod 431 to pass through is provided on the bottom end plate of the screw cylinder 43. The first motor 44 is disposed at the upper end of the screw cylinder 43 and can drive the screw 441 to rotate around the vertical axis, thereby driving the slider to move up and down in the screw cylinder 43, thereby achieving the purpose of driving the top cover 42 to move up and down. A rubber pad 421 is provided on the end surface of the top cover 42 facing the upper port of the filter cartridge 40, so that when the top cover 42 is pressed against the upper port of the filter cartridge 40, the rubber pad 421 can fully seal the upper port of the filter cartridge 40.

[0052] like Figures 4 to 9 As shown, 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 at the periphery of the central boss 451. The bottom surface of the annular recessed groove 452 is an inclined surface and is an inclined surface extending downwardly in the direction from the outer circle to the inner circle (of the annular recessed groove 452). After assembly, the outer circle edge of the annular recessed groove 452 extends to the inner circumference of the lower port of the filter cartridge 40, and the inner circle edge extends to the outer circumference of the central boss 451. The shaft end section 52 matches the shaft hole structure provided 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 distributed alternately around the circumferential direction are formed at the position where the central boss 451 and the annular recessed groove 452 are connected, and the through holes 453 are formed as arc-shaped through holes. The valve cover unit includes four plugs 463 corresponding to the through holes 453 and a transmission mechanism capable of driving the plugs 463 to move synchronously up and down. The transmission mechanism is arranged at the lower part of the base 45.

[0053] Relying on the above structure, when backwashing the cylinder wall of the filter cartridge 40, the generated sewage can be gathered in the annular trough 452, and quickly flow down to the cone section 22 through the through hole 453, which can effectively prevent the excessive accumulation and deposition of sewage at the joint position between the upper end of the base 45 and the lower end of the filter cartridge 40, and ensure the cleanliness of the cylinder wall at the lower end of the filter cartridge 40. Further, in order to reduce the obvious accumulation and deposition of sewage on the upper end surface of the central boss 451, the upper end surface edge of the central boss 451 can be formed into an annular cone 4511, and the annular cone 4511 is in the form of extending downward from the inside and the outside. At the same time, the upper end surface of the plug 463 is formed into an inclined portion 4632, and the lower end of the inclined portion 4632 is opposite to the lower end of the annular trough 452.

[0054] The transmission mechanism includes a slide 46 and a hydraulic cylinder part 47. The slide 46 includes a seat body 461, a plurality of vertical arms 462 with the plugs 463 respectively provided at the upper ends, and a plurality of radial edge arms connecting the seat body 461 and the vertical arms 462. There is a one-to-one matching relationship between the vertical arms 462 and the plugs 463, and there is also a one-to-one matching relationship between the radial edge arms and the vertical arms 462. Correspondingly, a bottom cylinder 4512 extending vertically downward is formed at the lower part of the base 45, and the vertical arms 462 and the bottom cylinder 4512 are matched through a track structure arranged in the vertical direction. Figures 4 to 5 As shown, the upper end of the vertical arm 462 (i.e., a section where the plug 463 is configured) and the opposite surface of the bottom cylinder 4512 are in a contact-matching relationship. In order to ensure the guiding effect, a guide rod 464 is provided on the radial edge arm, and a guide hole 4513 corresponding to and matching the guide rod 464 is provided on the bottom cylinder 4512. On the bottom cylinder 4512, a cavity extending vertically upward is formed on 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 cylinder 4512 are connected as a whole. An end cover 48 is provided at the port of the cavity, and an axial hole for the cylinder rod of the hydraulic cylinder to extend is formed on the end cover 48 (the axial 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 moves in a telescopic motion, the seat body 461 or the slide seat 46 can be lifted and moved up and down in the vertical direction, and the control block 463 moves synchronously, switching between blocking the through hole 453 and keeping the through hole 453 in a conductive state.

[0055] In order to improve the sealing effect between the relative circumferential surface / arc surface of the plug block 463 and the through hole 453, the relative surfaces of the two can still maintain a good sealing state after long-term use, thereby reducing the energy consumption caused by 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 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 relatively far away from the axis of the center boss 451 relative to the upper end. The outer side surface of the through hole 453 is formed into a conical surface, and the lower end is relatively far away from the axis of the center boss 451 relative to the upper end. In this way, the conical surface 4631 can establish a contact matching relationship with the outer side surface of the through hole 453, and sludge is not easy to hang 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 center boss 451 or the outer peripheral surface of the bottom cylinder 4512. Figure 4 In the illustrated embodiment, the outer peripheral surface of the central boss 451 and the outer peripheral surface of the upper portion of the bottom cylinder 4512 are located on the same cylindrical surface.

[0056] like Figures 4 to 10 As shown, on the lower end surface of the base 45, plug plate groups are arranged 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 arranged alternately. One or two support plates 214 are formed on the bottom plate 213 along the diameter direction (see Fig.10 The support plate 214 is provided with a support arm group corresponding to and matching the two opposite plug plate groups.

[0057] The support arm group includes two pairs of support arms 2141, and the four support arms 2141 are relatively distributed at the four corners of a square. A gap area 2142 is formed on the support arm 2141 and between the opposite ends of two adjacent and opposite support arms 2141. The plug plate 454 can pass downward from the gap area 2142, and then the base 45 is relatively fixed on the bottom plate 213 through the studs 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, so that the bottom column 4512 and the slide seat 46 can pass downward through the support plate 214 to form a gap for making way. Figures 4 to 9 The solution shown only requires one support plate 214 to be configured, and a support arm group corresponding to and matching the two plug plate groups is configured on the support plate 214 . Fig.10 In the illustrated solution, two pairs of plug-in board groups need to be configured on the base 45 and a pair of plug-in board groups need to be configured on each support plate 214 .

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas 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) disposed in the column section (21) of the tower tank (20) and a plurality of flushing pipe assemblies corresponding to the filter cartridges (40); the cartridge wall of the filter cartridge (40) is made of an inorganic material blank and sintered at high temperature, or is made of a metal material and through a powder metallurgy process, and is a rigid, breathable cartridge 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).

2. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: A plurality of injection 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 injection 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 a flushing medium input pipe (55) in a flushing medium supply unit is connected to each flushing pipe (50) via a 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, thereby causing the slider to move 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 drive unit comprises a gear portion (51) disposed on the upper portion of the flushing pipe (50), a transmission box (511) matched with the gear portion (51), and a second motor (512) matched with an input end of the transmission box (511); the transmission box (511) is fixed on the top chamber (30) and its output end meshes with the gear portion (51), thereby driving the flushing pipe (50) to rotate.

6. The industrial furnace tail gas dust removal device according to claim 1 is characterized in that: A central boss (451) is formed in the central region 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); and a plurality of through holes (453) distributed alternately in the circumferential direction are formed on the base (45) 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).

7. The industrial furnace tail gas dust removal device according to claim 6 is characterized in that: The transmission mechanism comprises a sliding seat (46) and a hydraulic cylinder portion (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).

8. The industrial furnace tail gas dust removal device according to claim 6, 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.

9. The industrial furnace tail gas dust removal device according to claim 1, 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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