WO2016155223A1 - Filtering device for gas-solid separation - Google Patents

Abstract

A filtering device for gas-solid separation, comprising: a box body (110). A pore plate (120) is provided inside the box body (110); the pore plate (120) is provided with a plurality of external filtration type filtering bags (130) in an arranging manner, each of the external filtering bags （130） comprising an opening end and a closed end; the opening ends of the filtering bags (130) are arranged on the pore plate (120); the closed ends of the filtering bags (130) are connected with an elastic traction device (170) used for axially tensioning the filtering bags (130); and the filtering bags (130) are internally provided with inner supporting components (131) used for radially and elastically tensioning the whole filtering bags （130）. The filtering bags (130) are in a bidirectional tensile state, namely an axial tensile state and a radial tensile state, under the combined action of the elastic traction devices (170) and the inner supporting components (131), and the deformation capability of the filtering bags (130) is between a rigid filtering element and a flexible filtering element.

Description

Filter device for gas-solid separation Technical field

The present invention relates to a filtering device, and in particular to a filtering device for gas-solid separation.

Background technique

In the field of gas-solid filtration separation, both external filter bags and external filter ceramic filter tubes are commonly used filter elements. The so-called "external filter type" refers to a filtration method in which the gas to be filtered is infiltrated from the outside of the filter element into the interior of the filter element to achieve gas-solid separation and purification. The filter device using the outer filter bag generally comprises a box body, and the box body is provided with an orifice plate, and the filter plate is arranged with a plurality of filter bags with upper end openings and closed ends, and the upper ends of the filter bags are mounted on the orifice plates. The lower end of the filter bag is suspended, and some filter devices are also provided with a bag cage loosely matched with the filter bag inside the filter bag (only preventing the inner bag of the filter bag); the inner body of the box body is located below the orifice plate as the original gas chamber, and is located in the hole Above the plate is a clean air chamber. The box body is provided with an air inlet which is connected to the original air chamber and an air outlet which is connected to the clean air chamber. The top of the box body is also provided for recoiling the respective filter bags. Ash backflushing device. The structure of the filtering device using the external filter type ceramic filter tube is similar to the above structure, the main difference is that the filter tube itself is rigid (and the filter bag is flexible), and the filter tube has no obvious radial contraction during filtration, so the filter tube has no such The bag cage acts like a structure.

The above-mentioned filter device using the external filter bag has the disadvantage that the backflush device usually has to be applied to the high-pressure recoil airflow of 0.1 to 0.8 MPa in the filter bag, which not only has high energy consumption, but also has an unsatisfactory effect on the recoil airflow cleaning. To this end, the applicant of the present application has provided a filter device for gas-solid separation in the invention patent application of CN 104028059 A (hereinafter referred to as reference), which increases the axial direction of the filter bag at the lower end of each filter bag. The tensioned elastic pulling device, so that when the backwashing device is used to perform the recoil airflow cleaning by the backflushing device, the filter bag first expands radially under the action of the recoil airflow, so that the lower end of the filter bag is further tightened elastically. Pulling device, and when the recoil airflow disappears, the filter bag axially vibrates under the elastic force of the elastic pulling device, generating a shearing force for peeling off the particles on the surface of the filter bag from the surface of the filter bag, thereby improving the filter bag Cleaning effect. In addition, the above reference also claims that there is no bag cage in the filter bag. When the filter bag has a short length, it is only necessary to axially tighten the filter bag without additional support for the filter bag; When the length of the bag is long, an anti-flat ring can be arranged on the bag body.

The inventor of the present application has noticed that the filter device using the external filter type ceramic filter tube has a small radial deformation amount in the filtration and backflushing process due to the rigidity of the filter tube itself, and the service life of the filter tube is high. However, since it is difficult to use the elastic pulling device in the reference device in the filtering device, the filter tube cannot be made to generate axial vibration to strengthen the cleaning; on the other hand, the filtering device in the reference can be elastically pulled. The device axially tensions the filter bag and causes the filter tube to generate axial vibration during the backflushing to assist the cleaning, but the filter bag still maintains a certain "flexible" state during use, and the radial deformation of the filter bag material is greatly increased. Higher than the rigid filter tube, which affects the life of the filter bag. In addition to the above problems, the Applicant has also found in the actual use of the filter device of the reference that the filter device has a poor sealing effect between the filter bag and the sealed end cap at the bottom of the filter bag, and the filter bag is inconvenient to assemble in the case. And other issues.

Summary of the invention

The present application firstly provides a filter device for gas-solid separation in which the advantages of the above-mentioned rigid filter tube and flexible filter bag are not well balanced, and the deformation capability of the filter element can be interposed between the rigid filter tube and the flexible device. Between the filter bags, the service life of the filter element can be increased compared to the flexible filter bag, and the filter element can be axially vibrated to enhance the cleaning compared to the rigid filter tube. The present invention will provide a filter device for gas-solid separation which improves the sealing performance between the filter bag and the sealed end cap for the problem of poor sealing performance between the filter bag and the sealed end cap at the bottom of the filter bag in the reference. . The present invention also provides a filtration apparatus for gas-solid separation that facilitates the installation of the filter element.

In order to solve the above first technical problem, a filter device for gas-solid separation includes a tank body in which an orifice plate is installed, and an outer filter type filter bag having one end open and the other end closed is arranged and arranged on the orifice plate. The open end of the filter bag is mounted on the orifice plate, and the closed end of the filter bag is connected with an elastic pulling device for axially tensioning the filter bag, and the elastic pulling device is connected and elastically tensioned to the filter bag and the filter Between the closed end of the closed end of the bag and the fixed member maintaining the set distance between the hole plate, the inner side of the hole plate is a raw air chamber, and the outer side of the hole plate is a clean air chamber, and the box body is provided with a conduction with the original air chamber. a gas port and an exhaust port connected to the clean air chamber, wherein the box body is provided with a backflushing device for performing backwashing air cleaning of each filter bag, and the filter bag is further provided with a radial direction of the filter bag Elastically tensioned inner support assembly. In the filtering state, the filter bag maintains axial elastic tension under the action of the elastic pulling device, and at the same time, the inner support assembly acts on the filter bag from the inside to the outside, and the filter bag maintains radial elasticity. Tensioning, the filter bag is axially and radially biaxially stretched under the action of the elastic pulling device and the inner support assembly. At this time, the deformability of the filter bag exhibits a relationship between the rigid filter element and the flexible filter element. In the intermediate state, only a small radial deformation occurs in the filter bag during filtration. When the backflushing air is used to clean the filter bag by the backflushing device, the filter bag first performs a small radial direction under the action of the recoil airflow. Expanding, so that the lower end of the filter bag is further tightened upwardly by the elastic pulling device, and when the recoil airflow disappears, the filter bag generates axial small amplitude and higher frequency vibration under the elastic force of the elastic pulling device, causing the vibration The shearing force that peels the particles on the surface of the filter bag from the surface of the filter bag, thereby improving the cleaning effect on the filter bag.

The inner support assembly may have a cylindrical cage structure adapted to the inner cavity of the filter bag, and preferably the outer diameter of the cage structure is greater than the inner diameter of the filter bag in the natural state by 0 to 1 mm. The above cylindrical cage structure ensures the contact area of the inner support component with the filter bag, and helps to achieve "integral" radial elastic tensioning of the filter bag; when the outer diameter of the cage structure is larger than the inner diameter of the filter bag in a natural state When the filter bag is 0~1mm, the inner diameter of the filter bag will be further reduced after the filter bag is tightened by the elastic pulling device, and the difference between the inner diameter of the filter bag and the outer diameter of the cage structure is further increased to ensure the filter through the cage structure. The bag is elastically elastically stretched as a whole. The outer diameter of the above cage structure may be further preferably 0.2 to 1 mm larger than the inner diameter of the filter bag in a natural state.

In order to achieve high filtration precision, the filter bag can ensure the filtration efficiency, and achieve better gas permeability to reduce the filtration resistance. At the same time, it can also facilitate the cleaning of the filter bag and ensure the filter bag is used for a long time. The slack does not occur, and the invention further improves the selection of the bag body structure and the material thereof, that is, the bag body comprises a liner composed of a high-strength breathable fabric and is closely attached to the outer surface of the bladder. Microporous filter film, the longitudinal tensile strength of the liner ≥ 520KN/m, transverse tensile strength ≥380KN/m. Combining the above-mentioned inner liner composed of high-strength breathable fabric with microporous filter film, on the one hand, benefiting from the high tensile strength of the high-strength breathable fabric, the filter bag will not be sustained under long-term use conditions. The tension is slack, avoiding the drop and disappearance of the axial and radial tension of the filter bag, preventing the radial deformation of the filter bag from increasing or/or due to the decrease or even disappearance of the axial and radial tension of the filter bag. On the other hand, since the filtering effect on the filter bag is a microporous filter film, the inner bladder supports the gas permeable effect, so the filter bag can simultaneously achieve higher filtration precision and better gas permeability, and can also be easily cleaned. gray.

The microporous membrane is preferably an expanded polytetrafluoroethylene membrane having a filtration rate of 99% or more for particles having a particle diameter of 0.1 to 0.12 μm; the liner is preferably composed of a glass fabric (for example, surface coating) The glass fiber woven fabric having a PTFE-reinforced lubricating protective layer is formed; the expanded polytetrafluoroethylene film is thermally coated on the glass fiber fabric. The above expanded polytetrafluoroethylene film is a film which forms a fibrous closed pore on a polytetrafluoroethylene material by tensile deformation (i.e., "bulk"). The film itself has the characteristics of strong water repellency and non-stickiness, so that the phenomenon of dew condensation film is not easily generated, and the purification and regeneration of the film can be easily achieved by the backflushing device. After the surface of the glass fiber fabric is coated with the PTFE-reinforced protective layer, the polytetrafluoroethylene-enhanced protective layer and the expanded polytetrafluoroethylene film are similar in material, so that the expanded body can be expanded. The PTFE film is more closely attached to the glass fiber fabric; on the other hand, the PTFE fiber lubricated protective layer enhances and lubricates the glass fiber woven fabric, thereby greatly improving the glass fiber woven fabric. The wear resistance enhances the life of the liner.

The material of the above liner may be prepared by impregnating and baking a glass fiber fabric with a polytetrafluoroethylene emulsion or a mixture of polytetrafluoroethylene and graphite. However, it is preferable that the inner liner material is formed by impregnating and baking a glass fiber with a polytetrafluoroethylene emulsion or a mixture of polytetrafluoroethylene and graphite, followed by weaving into a glass fiber fabric. The glass fiber is first impregnated with a polytetrafluoroethylene emulsion or a mixture of polytetrafluoroethylene and graphite, baked, and finally woven into a fiberglass fabric, which makes it easier to ensure that the finished fiberglass fabric is ideal. Breathability, but also make the coating of glass fiber fabric more comprehensive and thorough. Impregnation with a mixture of polytetrafluoroethylene and graphite results in better lubricity (especially high temperature lubricity) of the formed polytetrafluoroethylene lubricated protective layer.

As a further improvement of the above filtering device, the box body is further provided with an orifice plate supporting positioning structure, and the orifice plate supporting positioning structure is arranged with at least two filter component mounting through holes, and each filter component is mounted on the through hole correspondingly A plurality of filter assemblies are mounted, the filter assembly including an orifice plate detachably sealingly coupled to the orifice support positioning structure and the filter bag having a plurality of open ends connected to the orifice plate through corresponding filter assembly mounting through holes. Through the above improvement, at least two sets of filter assemblies respectively detachably connected to the orifice support positioning structure are formed in the tank, and the filter bag on each filter assembly can be pre-installed to the filter assembly outside the tank of the filter device. On the orifice plate, the orifice plate filled with the filter bag is then connected to the orifice support positioning structure in the tank body, so that the filter assembly is matched with the corresponding filter assembly mounting through hole, which can facilitate the assembly and maintenance of the filter device. .

As a further improvement to the above filtering device, the closed end of the filter bag is mounted with a rigid sealing end cap, the sealing end cap A pull hook connected to the elastic pulling device is installed at the center of the bottom, and one end of the sealed end cover is integrally connected with the inner support assembly. The key to this improved structure is to connect the end of the sealed end cap to the inner support assembly, whereby the inner support assembly can be positioned both radially by the filter bag and axially by connection to the sealed end cap. Thereby further limiting the movement of the inner support assembly, reducing the relative friction between the inner support assembly and the filter bag, and increasing the service life of the filter bag.

In addition, in order to improve the tightness between the filter bag and the sealing end cap, the closed end of the filter bag is provided with an inner flange, which comprises a rigid annular support piece integral with the filter bag, the upper end of the rigid annular sealing piece A sealing ring is provided between the outer flange of the upper end of the sealed end cap. The "rigid" of the annular support piece means that the annular support piece itself is made of a rigid material, for example, the annular support piece is composed of an annular steel piece, but the annular support piece as a whole can have a certain radial deformation ability, so as to facilitate If necessary, the sealed end cap is loaded from the outside of the closed end of the filter bag to the closed end of the filter bag. The rigid annular support piece increases the overall rigidity of the closed end of the filter bag. After the seal ring is disposed between the upper end of the rigid annular seal piece and the upper end outer flange of the seal end cover, the seal ring is outside the upper end of the rigid annular support piece and the sealed end cover The flange is pressed to achieve a seal between the filter bag and the sealed end cap, and the sealing effect is stable and reliable.

In order to solve the above second technical problem, the filtering device for gas-solid separation comprises a box body, and the hole plate is installed in the box body, and the outer plate filter with one end opening and the other end closed is arranged and arranged on the hole plate. a bag, the open end of the filter bag is mounted on the orifice plate, and the closed end of the filter bag is mounted with a rigid sealing end cap, and the sealing end cap is connected with an elastic pulling device for axially tensioning the filter bag, the elasticity The pulling device is connected and elastically tensioned between the filter bag and the fixing member outside the closed end of the filter bag and maintaining a set distance from the orifice plate. The inside of the tank body is located in the original gas chamber on the inner side of the orifice plate, and is cleaned outside the orifice plate. The chamber is provided with an air inlet which is connected to the original air chamber and an air outlet which is connected to the clean air chamber, and the box body is provided with a back blowing device for performing backwashing air cleaning of each filter bag. Wherein the closed end of the filter bag is provided with an inner flange, the inner flange comprises a rigid annular support piece integral with the filter bag, and the upper end of the rigid annular sealing piece is sealed with the outer end of the upper end of the sealed end cover ring. The rigid annular support piece increases the overall rigidity of the lower end of the filter bag. After the seal ring is disposed between the upper end of the rigid annular seal piece and the upper end outer flange of the seal end cover, the seal ring is outside the upper end of the rigid annular support piece and the sealed end cover. The flange is pressed to achieve a seal between the filter bag and the sealed end cap, and the sealing effect is stable and reliable.

In order to solve the above third technical problem, the filtering device for gas-solid separation includes a box body in which an orifice plate is installed, and the outer plate type filter bag with one end open and the other end closed is arranged and arranged on the orifice plate. The open end of the filter bag is mounted on the orifice plate, and the inside of the tank body is a raw gas chamber on the inner side of the orifice plate, and a clean air chamber is located outside the orifice plate, and the inlet body of the filter body is connected to the original gas chamber and a venting port connected to the clean air chamber, wherein the box body is provided with a backflushing device for performing backwashing air cleaning of each filter bag, wherein the box body is provided with an orifice plate supporting positioning structure, and the orifice plate supports The positioning structure is arranged with at least two filter assembly mounting through holes, and each of the filter assembly mounting through holes is correspondingly mounted with a set of filter components, and the filter assembly comprises an orifice plate detachably and sealingly connected with the orifice support positioning structure and The open ends are passed through the corresponding filter assembly mounting through holes to the filter bag that is connected to the orifice plate. Through the above improvement, at least two groups are respectively formed in the box body and supported by the orifice plate The filter assembly is detachably connected to the structure, and the filter bag on each filter assembly can be pre-installed on the orifice plate of the filter assembly outside the box of the filter device, and then the orifice plate and the orifice plate filled with the filter bag The support positioning structure is connected in the casing so that the filter assembly is fitted with the corresponding filter assembly mounting through hole, which facilitates assembly and maintenance of the filter device.

The invention will be further described below in conjunction with the drawings and specific embodiments. The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

FIG. 1 is a schematic structural view of a specific embodiment of a filtering device of the present application.

Figure 2 is a partial enlarged view of a portion A in Figure 1.

Figure 3 is a partial enlarged view of a portion B in Figure 1.

4 is a top plan view of the orifice plate support positioning structure of FIG. 1.

detailed description

As shown in FIG. 1 , a typical structure of the filter device for gas-solid separation of the present application is as follows: the filter device includes a tank 110 in which the orifice plate 120 is mounted, and the orifice plate 120 is arranged on the orifice plate 120. The outer filter filter bag 130 has a plurality of open ends and the lower end is closed. The upper ends of the filter bags 130 are mounted on the orifice plate 120. The lower end of the filter bag 130 is connected with elastic tension for respectively axially tensioning the filter bags 130. The device 170, the elastic pulling device 170 is connected and elastically tensioned between the filter bag 130 and the fixing member 180 under the filter bag 130 and maintaining a set distance from the orifice plate 120. Each filter bag 130 is further provided with a filter bag 130. The inner radially-tensioned inner support assembly 131, the inner support assembly 131 specifically adopts a cylindrical cage structure 131a adapted to the inner cavity of the filter bag 130, the outer diameter of the cage structure 131a is larger than the filter bag 130 is in the natural state, the inner diameter is 0 to 1 mm; the tank 110 is located below the orifice plate 120 as the original gas chamber 140, and above the orifice plate 120 is the clean air chamber 150. The tank 110 is provided with the original gas chamber 140. An air inlet 111 and an exhaust port 112 connected to the clean air chamber 150 are provided above the box 110 for The filter bag 130 performs a backflushing device 160 for recoiling the airflow.

The above cylindrical cage structure 131a is substantially different in function from the "pocket cage" mentioned in the background art. The bag cage and the filter bag are loosely matched, and the function is only to prevent the filter bag from being invaded due to the air pressure outside the filter bag being higher than the air pressure inside the filter bag in the filtered state. The cylindrical cage structure 131a of the present application functions as an integral radial elastic tensioning filter bag 130, i.e., the filter bag 130 is collapsed outside the cylindrical cage structure 131a. Since the filter bag 130 is in an axially and radially biaxially stretched state under the combined action of the elastic pulling device 170 and the cylindrical cage structure 131a, the deformability of the filter bag 130 exhibits a relationship between the rigid filter element and the flexible filter element. In the intermediate state between the filter bag 130, only small radial deformation occurs during the filtering, and when the back filter air is cleaned by the backflushing device 160, the filter bag 130 is firstly subjected to the recoil flow. The radial expansion is small, so that the lower end of the filter bag 130 is further tightened upward by the elastic pulling device 170, and when the recoil airflow disappears, the filter bag 130 generates an axial small amplitude under the elastic force of the elastic pulling device 170. The higher frequency vibration produces a shearing force that causes the particles on the surface of the filter bag 130 to be peeled off from the surface of the filter bag 130, thereby improving the cleaning effect on the filter bag 130.

In the above filtering device, the bag body of the filter bag 130 specifically comprises a liner composed of a high-strength breathable fabric and a microporous filter film closely attached to the outer surface of the liner, and the longitudinal direction of the bladder (corresponding to the axial direction of the filter bag) The tensile strength is ≥520KN/m, and the transverse direction (corresponding to the radial direction of the filter bag) is ≥380KN/m. More specifically, the microporous filtration membrane adopts an expanded polytetrafluoroethylene membrane having a filtration ratio of 99% or more for particles having a particle diameter of 0.1 to 0.12 μm; the inner liner is composed of a glass fiber fabric; The vinyl fluoride film is attached to the glass fabric. It should be noted that the structure, performance and the like of the above-mentioned filter bag 130 have been described in detail in the reference. For related content, reference may be made to the description of the document, which is not described herein again.

Example 1

1 to 3, the bag body of the filter bag 130 is composed of the inner casing made of the expanded polytetrafluoroethylene film and the glass fiber fabric. The inner liner has a thickness of 0.5 mm, a longitudinal tensile strength of 580 KN/m, and a transverse tensile strength of 430 KN/m. The filter bag 130 has a length of 12 meters and a diameter of 300 mm. A sealing ring 121 is disposed between the upper end side wall of each filter bag 130 and the filter bag mounting hole of the orifice plate 120. The lower end of each filter bag 130 is mounted with a rigid sealing end cap 134, and the bottom end of each sealing end cap 134 is installed at the bottom. There is a hook 134b connected to the corresponding elastic pulling device 170. The sealing end cover 134 and the cylindrical cage structure 131a are independent members, and the sealing end cover 134 and the filter bag 130 are mounted and connected with reference to FIG. The way is the same. The elastic pulling device 170 employs a spring cylinder having one end connected to the lower hook 134b of the seal end cap 134 and the other end connected to the fixing member 180. The tensile force applied to the corresponding filter bag by each elastic pulling device was set to 40 kg. The outer diameter of the cylindrical cage structure 131a is larger than the inner diameter of the filter bag 130 in the natural state by 0.5 mm. During normal filtration, the gas to be filtered enters the raw air chamber 140 from the air inlet 111, and then passes through the filter bag under the filtering pressure into the clean air chamber 150 (the radial deformation of the filter bag is small), and the filtered gas is discharged from the row. The gas port 112 is discharged; when a certain thickness of dust adheres to the surface of the filter bag, the backflushing device 160 acts on the high pressure pulse backflushing airflow of the filter bag, and the filter bag generates axial small amplitude high frequency vibration, and the filter bag has good cleaning effect. .

Example 2

On the basis of Example 1, Example 2 further improved the structure of the lower end of each filter bag 130. Specifically, as shown in FIG. 3, the top of the sealed end cap 134 is welded integrally with the bottom of the cylindrical cage structure 131a; in addition, the lower end of each filter bag 130 is further provided with an inner flange, which includes and filters A rigid annular support piece 132 of the bag 130 is integrally provided with a sealing ring 133 between the upper end of the rigid annular sealing piece 132 and the upper end outer flange 134a of the sealed end cap 134. Wherein, the inner flange may be formed by directly fixing the rigid annular support piece 132 to the inner wall of the lower end of the filter bag 130, or by forming the rigid annular support piece 132 into the lower end of the filter bag 130. The inner flange. The rigid annular support piece 132 is constructed of an annular steel sheet. The inner flange is formed in Fig. 3 by directly securing the rigid annular support piece 132 to the inner wall of the lower end of the filter bag 130. After the sealing end cap 134 is welded integrally with the cylindrical cage structure 131a, the assembly of the filter bag 130, the sealing end cap 134 and the cage structure 131a in the casing 110 is facilitated (the cage structure connecting the sealing end caps 134) The loading of the filter bag 130 from the top to the bottom of the 131a is quick and easy, and at the same time, the integrity of the three is improved, and the wear between the filter bag 130 and the cage structure 131a is reduced. The arrangement of the rigid annular support piece 132 increases the rigidity of the lower end of the filter bag 130 in a rigid annular seal After the sealing ring 133 is disposed between the upper end of the piece 132 and the upper end outer flange 134a of the sealing end cap 134, the sealing ring 133 is pressed by the rigid annular support piece 132 and the upper end outer flange 134a of the sealing end cover 134. Thereby a seal between the filter bag and the sealed end cap is achieved. The sealing effect between the filter bag 130 and the sealed end cap 134 in Example 2 was found to be significantly better than the sealing effect between the filter bag 130 and the sealed end cap 134 in Example 1.

Example 3

On the basis of Embodiment 2, Embodiment 3 further improves the manner in which the respective filter bags 130 are mounted in the casing 110. Specifically, as shown in FIG. 1 and FIG. 4, an aperture plate support positioning structure 190 is mounted in the housing 110. In the embodiment, four filter assembly mounting through holes 191 are arranged on the aperture support positioning structure 190. (As shown in FIG. 4, the four filter assembly mounting through holes 191 are in a planar rectangular array), and each filter assembly mounting through hole 191 is correspondingly mounted with a set of filter assemblies, and the filter assembly includes a detachable support plate 190. The seal-connected orifice plate 120 and the plurality of upper ends pass through the corresponding filter assembly mounting through-hole 191 to the filter bag 130 to which the orifice plate 120 is attached. The orifice support positioning structure 190 is specifically composed of a profile steel (specifically selected channel steel) welded and fixed on the inner wall of the casing 110, and each filter assembly installation through hole 191 is formed by a corresponding steel frame. The orifice plate 120 and the profile steel are connected by a threaded connection member 192, and a sealing member is also mounted on the mating surface of the orifice plate 120 and the profiled steel. Through the above improvement, four sets of filter assemblies respectively detachably connected to the orifice support positioning structure are formed in the box, and the filter bag on each filter assembly can be pre-installed to the hole of the filter assembly outside the box of the filter device. On the board, the orifice plate filled with the filter bag is then connected to the orifice support positioning structure in the tank body, so that the filter assembly is matched with the corresponding filter assembly mounting through hole, which can facilitate assembly and maintenance of the filter device.

Claims (10)

The filtering device for gas-solid separation comprises a box body (110), wherein the box body (110) is provided with an orifice plate (120), and the orifice plate (120) is arranged with a plurality of one end openings and the other end closed. An outer filter bag (130), the open end of the filter bag (130) is mounted on the orifice plate (120), and the closed end of the filter bag (130) is connected to axially tension the filter bag (130) Elastic pulling device (170), the elastic pulling device (170) is connected and elastically tensioned to the filter bag (130) and the fixing member of the filter bag (130) outside the closed end and maintaining a set distance from the orifice plate (120) Between (180), the inside of the tank (110) is located inside the orifice plate (120) as a raw gas chamber (140), and outside the orifice plate (120) is a clean air chamber (150), and the casing (110) is provided An air inlet (111) that is electrically connected to the original air chamber (140) and an air outlet (112) that is connected to the clean air chamber (150), and the housing (110) is provided for each filter bag (130) A backflushing device (160) for performing backflushing cleaning is characterized in that the filter bag (130) is provided with an inner support assembly (131) for radially elastically tensioning the filter bag (130) as a whole. A filter device for gas-solid separation according to claim 1, wherein said inner support assembly (131) has a cylindrical cage structure (131a) adapted to the inner cavity of the filter bag (130). The outer diameter of the cage structure (131a) is larger than the inner diameter of the filter bag (130) in the natural state by 0 to 1 mm. A filter device for gas-solid separation according to claim 1, wherein said bag (130) bag body comprises a bladder composed of a high-strength breathable fabric and a micro-adherently attached to the outer surface of the bladder. The pore filtration membrane has a longitudinal tensile strength of ≥520 KN/m and a transverse tensile strength of ≥380 KN/m. The filtering device for gas-solid separation according to claim 3, wherein the microporous filtering membrane adopts an expanded polytetrafluoroethylene having a filtering ratio of 99% or more for particles having a particle diameter of 0.1 to 0.12 μm. a vinyl fluoride film; the inner liner is made of a fiberglass fabric; and the expanded polytetrafluoroethylene film is attached to the glass fiber fabric. The filter device for gas-solid separation according to any one of claims 1 to 4, characterized in that the tank body (110) is provided with an orifice support positioning structure (190), the orifice plate The support positioning structure (190) is arranged with at least two filter assembly mounting through holes (191), and each filter assembly mounting through hole (191) is correspondingly mounted with a set of filter assemblies, and the filter assembly includes positioning with the orifice plate support The structure (190) detachably seals the connected orifice plate (120) and the plurality of open ends through the corresponding filter assembly mounting through hole (191) to the filter bag (130) to which the orifice plate (120) is attached. The filtering device for gas-solid separation according to claim 5, wherein the orifice supporting positioning structure (190) is composed of a steel welded and fixed to the inner wall of the casing (110), and each filter assembly is installed. The through hole (191) is formed by an outer frame surrounded by a corresponding steel; the orifice plate (120) is connected with the steel through a threaded connection member (192), and the mating surface of the orifice plate (120) and the profile steel is also installed. Seals. A filter device for gas-solid separation according to any one of claims 1 to 4, characterized in that the closed end of the filter bag (130) is fitted with a rigid sealing end cap (134), the sealed end A hook (134b) connected to the elastic pulling device (170) is mounted at the center of the bottom of the cover (134), and one end of the sealed end cover (135) is integrally connected with the inner support assembly (131). A filter device for gas-solid separation according to claim 7, wherein said filter bag (130) has an inner end flange at its closed end, said inner flange including a rigid ring integral with the filter bag (130) A support piece (132) is provided with a sealing ring (133) between the upper end of the rigid annular sealing piece (132) and the upper end outer flange (134a) of the sealing end cover (134). The filter device for gas-solid separation according to claim 8, wherein the rigid annular support piece (132) is directly fixed to the inner wall of the closed end of the filter bag (130) to form the inner flange; The rigid annular support piece (132) is encased in the closed end flange of the filter bag (130) to form the inner flange. A filter device for gas-solid separation according to any one of claims 1 to 4, wherein the elastic pulling device (170) employs a spring cylinder, one end of the spring cylinder and the filter bag (130) The lower end is connected and the other end is connected to the fixing member (180).

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