JP2017100098A - Gas filter element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas filter element capable of removing both impurity particles and impurity gas in gas.SOLUTION: A gas filter element includes: a cylindrical filter part through which gas to be treated passes from outside to inside; a first end plate and a second end plate which are provided on both end sides of the cylindrical filter part, have a substantially annular and planar shape, and seal both end sides of the cylindrical filter part by being adhered to both ends of the cylindrical filter part. The cylindrical filter part is formed of a laminate comprising a sheet-like dust removal filter medium and non-woven fabric formed of active carbon fibers, and the laminate processed in a pleaded form is a cylindrically molded body in such a manner that the non-woven fabric formed of active carbon fibers is arranged outside and the sheet-like dust removal filter medium is arranged inside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to liquefied natural gas (LNG), non-liquefied natural gas, city gas, biogas produced by fermentation decomposition of waste such as sewage sludge and garbage, and gas pipes such as gas synthesized from coal The present invention relates to a gas filter attached to a line and a gas filter element attached to a governor attached to a gas pipeline.

  In the city gas manufacturing plant, the LNG transported by the LNG tanker or the LNG lorry is vaporized and then subjected to odor and heat amount adjustment to produce city gas. The city gas produced is transported directly to the user through the pipeline or once stored in the gas holder.

  Since the city gas to be transported contains impurity particulates originally mixed in the raw material LNG and impurity particulates generated from city gas production equipment, gas holders, pipelines, etc., a gas filter is installed in the pipeline. Installed to remove impurity particulates in city gas. In the gas filter installed in this pipeline, a gas filter element is used as a member for removing impurity fine particles.

  Also, since the city gas produced at the city gas manufacturing plant has a high pressure of 1.0 MPa or more, the city gas pressure is controlled by a governor before it is stored in the gas holder or supplied to the user. Is lowered before being transported to the gas holder or user. And in this governor, in order to remove the impurity particulates in city gas, the gas filter element is installed.

  However, although the conventional gas filter or gas filter element can remove fine particles in city gas, impurity gas in city gas, for example, sulfur compounds such as hydrogen sulfide, mercury, halogen compounds, nitrogen compounds, etc. It cannot be removed.

  In addition to the removal of impurity fine particles in the gas from the place where the gas is produced to the place where it is used, such as biogas, other than city gas, impurity gases such as sulfur such as hydrogen sulfide and mercaptans It is necessary to remove compounds, mercury, halogen compounds, nitrogen compounds and the like.

  Accordingly, an object of the present invention is to provide a gas filter element capable of removing both impurity fine particles and impurity gas in a gas.

The problems in the above prior art are solved by the present invention described below.
That is, the present invention provides a cylindrical filter portion through which a gas to be treated is vented from the outside to the inside, and is provided on one end side of the cylindrical filter portion and has a substantially annular and flat plate shape. A first end plate that seals one end of the cylindrical filter portion by being bonded to one end of the cylindrical filter portion; and a substantially annular and flat plate-like shape provided on the other end side of the cylindrical filter portion A second end plate that seals the other end side of the cylindrical filter part by being bonded to the other end of the cylindrical filter part,
The cylindrical filter portion is composed of a laminate of a sheet-shaped dust removal filter medium and an activated carbon fiber nonwoven fabric, and the laminate processed into a pleated shape has the activated carbon fiber nonwoven fabric disposed on the outer side and the inner side of the laminate. The sheet-shaped dust removal filter medium is arranged so that it is a molded body formed into a cylindrical shape,
The gas filter element characterized by this is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the gas filter element which can remove both the impurity particulates and impurity gas in gas can be provided.

It is a typical end view of a gas filter structure. It is the figure which looked at the gas filter structure shown in FIG. 1 from the top. It is a schematic diagram of the form example of the gas filter element of this invention installed in the gas filter structure shown in FIG. It is a figure which shows the cylindrical filter part of the gas filter element in FIG. It is an enlarged view of A part in FIG. It is a figure which shows the 1st end plate of the gas filter element in FIG. It is a figure which shows a mode that to-be-processed gas passes a cylindrical filter part. It is the typical end elevation which expanded a part of form example of a layered product. It is a typical perspective view which shows the example of a cylindrical reinforcement member which has many gas permeation holes. FIG. 10 is a schematic end view showing an example of a gas filter element provided with the cylindrical reinforcing member shown in FIG. 9. It is a typical end view of the form example with which the gas filter element is connected in series.

  The gas filter element of this invention is demonstrated with reference to FIGS. FIG. 1 is a schematic end view of a gas filter structure. FIG. 2 is a top view of the gas filter structure shown in FIG. 3 is a schematic view of an embodiment of the gas filter element of the present invention installed in the gas filter structure shown in FIG. 1, FIG. 3 (A) is a perspective view, and FIG. 3 (B) is an end face. FIG. 4 is a view showing a cylindrical filter portion of the gas filter element in FIG. 3, FIG. 4 (A) is a perspective view, and FIG. 4 (B) is a view from above. FIG. 5 is an enlarged view of a portion A in FIG. 6 is a view showing a first end plate of the gas filter element in FIG. 3, FIG. 6 (A) is a perspective view, and FIG. 6 (B) is an end view. FIG. 7 is a diagram illustrating how the gas to be processed passes through the cylindrical filter portion.

  As shown in FIGS. 1 and 2, the gas filter structure 1 includes a casing part cylindrical part 9, a casing part upper lid part 7, and a casing part lower lid part 8 to form a casing. The housing upper lid portion 7 and the housing lower lid portion 8 are flange portions 14 formed at both ends of the housing cylindrical portion 9 and are attached using fixing bolts 13. And the gas filter element 10 is installed in the housing | casing. A circular and flat upper sealing plate 2 is attached to the upper side of the gas filter element 10, and an annular and flat lower sealing plate 3 is attached to the lower side. The gas filter element 10 provided with the upper sealing plate 2 and the lower sealing plate 3 is fixed in the gas filter structure 1 by the support portion 3. On the side surface of the gas filter structure 1, a gas supply pipe 6 to be processed for supplying the gas 20 to be processed is attached to the space 11 in the housing. The gas filter structure 1 is connected to the inside of the gas filter element 10 through the insertion opening formed in the lower lid portion 8 and the lower sealing plate 5 and exhausts the processing gas 21. A processing gas discharge pipe 4 is attached. In addition, between the gas filter element 10 and the upper sealing plate 2 and the lower sealing plate 5, the inside of the insertion port of the lower sealing plate 5 and the insertion port of the housing lower lid portion 8, and the processing gas discharge pipe 4. The space between the outside and the housing portion upper lid portion 7 and the housing portion lower lid portion 8 and the flange portion 14 are sealed. In FIG. 2, the outlines of the gas filter element 10 and the processing gas discharge pipe 4 are indicated by dotted lines.

  And the to-be-processed gas 20 is supplied into the housing | casing of the gas filter structure 1 from the to-be-processed gas supply pipe | tube 20, The to-be-processed gas 20 supplied in the housing | casing is the side part of the cylinder of the gas filter element 10. From the outside, it passes through the cylindrical filter part and escapes to the inside to become the processing gas 21. The processing gas 21 is discharged from the inside of the gas filter element 10 to the outside of the gas filter structure 1 through the processing gas discharge pipe 4.

  As shown in FIG. 3, the filter element 10 installed in the gas filter structure 1 includes a cylindrical filter portion 15, a first end plate 16, and a second end plate 18.

  As shown in FIGS. 4 and 5, the cylindrical filter portion 15 includes a laminate 22 of a sheet-shaped dust removal filter medium 24 and a nonwoven fabric 23 of activated carbon fibers. In the cylindrical filter portion 15, the laminate 22 is processed into a pleat shape, and in the cylindrical filter portion 15, the laminate 22 processed into a pleat shape is arranged with a nonwoven fabric 23 of activated carbon fibers on the outside. The sheet-shaped dust removal filter medium is arranged inside, and is formed into a cylindrical shape.

  As shown in FIG. 6, the first end plate 16 has an annular and flat plate shape. An annular rib 17 is formed on the cylindrical filter portion side of the inner end of the first end plate 16, and an annular rib 37 is formed on the cylindrical filter portion side of the outer end of the first end plate 16. Has been. Then, the first end plate 16 is bonded to one end of the cylindrical filter portion 15, so that the gas to be treated 20 that has entered from the outside of the cylindrical filter portion 15 is transferred to the cylindrical filter portion as shown in FIG. 7. It is a member for sealing one end side of the cylindrical filter portion 15 so as not to leak from one end side of the portion 15 to the inside of the cylindrical filter portion 15. The first end plate 16 that seals one end of the cylindrical filter portion 15 is provided on one end side of the cylindrical filter 15 so as to adhere to the outer side of the cylindrical filter 15 as shown in FIG. The gas 20 to be processed passes through the cylindrical filter 15 and escapes to the inside of the cylindrical filter 15.

  Further, the second end plate 18 is the same as the first end plate 16, and the first end plate 17 has an annular and flat plate shape, and the inner end of the second end plate 18 has a cylindrical filter part side. An annular rib 19 is formed, and an annular rib 39 is formed on the outer side end of the second end plate 18 on the cylindrical filter portion side. The first end plate 18 is bonded to the other end of the cylindrical filter 15, so that the gas to be treated 20 that has entered from the outside of the cylindrical filter portion 15 is transferred from the other end side of the cylindrical filter portion 15. It is a member for sealing the other end side of the cylindrical filter portion 15 so as not to leak into the cylindrical filter portion 15. Since the second end plate 18 that seals the other end of the cylindrical filter portion 15 is attached to the other end side of the cylindrical filter 15, the gas 20 to be processed outside the cylindrical filter 15 is provided. Then, it passes through the cylindrical filter 15 and escapes to the inside of the cylindrical filter 15.

  In the present invention, the one end and the other end of the cylindrical filter portion indicate respective ends in the direction in which the cylinder extends.

  Further, an annular rib 17 formed at the inner end of the first end plate 16, an annular rib 37 formed at the outer side, an annular rib 19 formed at the inner end of the second end plate 18, and an outer side formed. When the end of the cylindrical filter portion is bonded to the end plate, the ring-shaped rib 39 can hold the adhesive in the portion surrounded by the end plate and the ring rib so that the bonding is easy. To play a role.

  Further, since both ends of the cylindrical filter portion 15 are bonded to the first end plate 16 and the second end plate 18, the cylindrical filter portion 15 has a cylindrical shape when gas is passed from the outside to the inside of the gas filter element 10. The cylindrical filter unit 15 is prevented from rotating in the circumferential direction of the filter unit 15.

The gas filter element of the present invention is provided with a cylindrical filter portion through which the gas to be treated is vented from the outside to the inside, and provided on one end side of the cylindrical filter portion, and has a substantially annular and flat plate shape, A first end plate that seals one end of the cylindrical filter portion by being bonded to one end of the cylindrical filter portion, and a substantially annular and flat plate provided on the other end side of the cylindrical filter portion. A second end plate that seals the other end side of the cylindrical filter part by being bonded to the other end of the cylindrical filter part.
The cylindrical filter portion is composed of a laminate of a sheet-shaped dust removal filter medium and an activated carbon fiber nonwoven fabric, and the laminate processed into a pleated shape has the activated carbon fiber nonwoven fabric disposed on the outer side and the inner side of the laminate. The sheet-shaped dust removal filter medium is arranged so that it is a molded body formed into a cylindrical shape,
It is a gas filter element characterized by this.

  The filter element of the present invention has a cylindrical filter portion, a first end plate, and a second end plate.

  A cylindrical filter part consists of a laminated body of a sheet-like filter material for dust removal and the nonwoven fabric of activated carbon fiber. The filter material for dust removal in the form of a sheet is not particularly limited as long as it can remove fine particles mixed in the gas. From the viewpoint of the material, for example, non-woven fabric of glass fiber, natural fiber, fluororesin, etc. Non-woven fabrics of organic fibers such as synthetic resin fibers, laminates of non-woven fabrics of organic fibers such as fluororesin membranes and natural fibers, synthetic fibers such as fluororesins, and metal meshes made of metal fibers. From, for example, medium performance filter media and HEPA filter media can be mentioned. The medium performance filter medium refers to a filter medium having a collection rate of 65 to 95% in a color method test based on JIS B 9908. In addition, the HEPA filter medium is defined as “a particle collection rate of 99.97% or more with respect to particles having a rated air volume and a particle size of 0.3 μm and an initial pressure loss in a test based on JIS Z 8122. It is defined as an “air filter having a performance of 245 Pa or less”. The thickness of the inorganic fiber or organic fiber that forms the filter material for dust removal in the sheet form, the size of the gap formed between the fibers, and the thickness of the filter medium for dust removal in the sheet form depend on the filtration accuracy, the mechanical strength of the filter, etc. In general, the thickness of the inorganic fiber, the organic fiber, and the metal fiber is 0.1 to 100 μm, and the thickness of the sheet-shaped dust filter is 0.1 to 2.0 mm, Preferably it is 0.6-0.8 mm. The activated carbon fibers forming the nonwoven fabric of activated carbon fibers include SOx, NOx, hydrogen sulfide and other acidic gas removal, ammonia, trimethylamine and other basic gas removal, mercury vapor removal, mercaptan, hydrogen sulfide and other sulfur. Examples include activated carbon fibers for removing compound gas and the like, which are appropriately selected according to the type and application of the gas to be treated. The thickness of the activated carbon fiber forming the nonwoven fabric of the activated carbon fiber, the size of the gap formed between the fibers, the thickness of the nonwoven fabric of the activated carbon fiber, the concentration or flow rate of the impurity gas component adsorbed on the activated carbon, and the adsorption rate of the activated carbon Or, the thickness of the fiber is usually 0.1 to 100 μm, preferably 10 to 20 μm, and the thickness of the nonwoven fabric of activated carbon fiber is preferably 1 to 20 mm, preferably Is 3 to 10 mm.

  The laminated body of the sheet-like filter material for dust removal which forms the cylindrical filter part, and the nonwoven fabric of activated carbon fiber is processed into the pleat shape. And the cylindrical filter part is a laminated body of sheet-shaped dust removal filter medium and activated carbon fiber nonwoven fabric processed into a pleat shape, activated carbon fiber nonwoven fabric is arranged on the outside, and sheet-shaped dust removal filter media on the inside It is the molded object shape | molded by the cylindrical shape so that it may be arrange | positioned. The cylindrical filter part is made of activated carbon fiber non-woven fabric and sheet-shaped dust removal filter medium. In addition to impurity fine particles in the gas, acidic gases such as SOx, NOx, and hydrogen sulfide, and basic gases such as ammonia and trimethylamine Impurity gases such as sulfur compound gases such as mercury vapor, mercaptan and hydrogen sulfide can be removed. Moreover, the activated carbon fiber non-woven fabric is arranged on the outer side, and the sheet-shaped dust removal filter medium is arranged on the inner side, so that the activated carbon fine particles generated by partially breaking the activated carbon fiber are prevented from being mixed into the processing gas. . The pitch interval of the pleats (the length indicated by reference numeral 30 in FIG. 4) is appropriately selected according to the filtration area, the amount of activated carbon adsorbed, etc., but is usually 5 to 20 mm, preferably 10 to 15 mm. The thickness of the pleats in the cylindrical filter portion (the length indicated by reference numeral 31 in FIG. 4) is appropriately selected according to the filtration area, the amount of activated carbon adsorbed, etc., but is usually 10 mm or more, preferably 40 to 100 mm.

  In the laminated body of the sheet-shaped dust removal filter medium and the activated carbon fiber non-woven fabric forming the cylindrical filter portion, as shown in the embodiment shown in FIG. A reinforcing material may be attached. Moreover, in the laminated body of the sheet-shaped dust removal filter medium and the activated carbon fiber nonwoven fabric forming the cylindrical filter portion, as in the embodiment shown in FIG. 8B, the sheet-shaped dust removal filter medium side of the laminated body. A reinforcing material such as a wire mesh or a resin mesh may be attached to the surface. The reinforcing material attached to the inner surface or both surfaces of the sheet-like dust filter material side is the vertical direction applied to the cylindrical filter portion when the gas filter element is installed (the direction in which the center line of the cylindrical filter portion extends, the following) Same as)). The reinforcing material attached to the sheet-like dust filter material side surface of the laminate or both surfaces of the laminate may be any material that reinforces the laminate and does not impede gas permeation. In the embodiment shown in FIG. 8 (A), the laminated body 22a includes a sheet-shaped dust removing filter medium 24, a non-woven fabric 23 of activated carbon fibers, and reinforcing metal meshes 26 and 26 attached to both surfaces of the laminated body 22a. It consists of. 8B, the laminated body 22b is attached to the surface of the sheet-like dust removal filter medium 24, the activated carbon fiber non-woven fabric 23, and the sheet-like dust removal filter medium 24 side of the laminate 22a. A reinforcing wire mesh 26. FIG. 8 is a schematic end view in which a part of the configuration example of the laminated body is enlarged.

  The first end plate has an annular and flat plate shape. The second end plate has an annular and flat plate shape. The first end plate and the second end plate are formed by adhering the first end plate to one end of the cylindrical filter portion and the second end plate to the other end of the cylindrical filter portion. It is a member for sealing both ends of the cylindrical filter portion so that the gas to be treated that has entered from the outside of the portion does not leak from both ends of the cylindrical filter portion to the inside of the cylindrical filter portion. . Since the first end plate and the second end plate for sealing both ends of the cylindrical filter portion are provided on both ends of the cylindrical filter portion, the gas to be treated outside the cylindrical filter portion is Then, it passes through the cylindrical filter part and comes out inside the cylindrical filter part. In the present invention, the one end and the other end of the cylindrical filter portion refer to one end and the other end in the direction in which the cylinder extends. The method for adhering the cylindrical filter part to the first end plate and the second end plate is appropriately selected according to the material and use conditions. For example, a method using an adhesive such as epoxy resin or silicon resin, or fusion bonding , Welding, caulking, and the like.

  Materials for the first end plate and the second end plate include plated steel plates, metals such as stainless steel and aluminum, polyolefin resins such as polypropylene (PP) and polyethylene (PE), polyester resins such as polyethylene terephthalate (PET), and polytetra Examples thereof include synthetic resins such as fluororesins such as fluoroethylene (PTFE) and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA). The materials of the first end plate and the second end plate are appropriately selected according to the environment to be used, temperature, chemical resistance and the like.

  Moreover, when both ends of the cylindrical filter portion are bonded to the first end plate and the second end plate, the cylindrical filter portion is passed when gas is passed from the outside to the inside of the gas filter element. The cylindrical filter portion is prevented from rotating in the circumferential direction.

  An annular rib may be formed in the first end plate and the second end plate on the inner end and the cylindrical filter portion side. The annular ribs formed at the inner ends of the first end plate and the second end plate are in contact with the inside of both ends of the cylindrical filter portion when gas is passed through the gas filter element from the outside to the inside. By this, it plays the role which prevents that a cylindrical filter part deform | transforms so that it may shrink | contract inward with the pressure of gas. In the present invention, the annular rib on the inner end and the cylindrical filter portion side is optional, and the end portion of the cylindrical filter portion and the first end plate and the second end plate are connected to the gas filter element from the outer side. When the gas is passed inward, the inner end and the cylindrical shape if the gas is applied with an adhesive force that does not cause the cylindrical filter portion to shrink inward due to the gas pressure. There is no need to add an annular rib on the filter side.

  An annular rib may be formed on the first end plate and the second end plate on the outer end and on the cylindrical filter portion side. The annular rib formed on the outer ends of the first end plate and the second end plate is a cylindrical filter when reverse pressure is applied to the gas filter element (when pressure is applied from the inside to the outside). By contacting the outer sides of both ends of the part, it plays a role of preventing the cylindrical filter part from deforming so as to spread outward due to a reverse pressure. In the present invention, the annular rib on the outer end and the cylindrical filter portion side is optional, and the end of the cylindrical filter portion and the first end plate and the second end plate are counter-pressured against the gas filter element. If it is bonded with an adhesive force that does not cause deformation such that the cylindrical filter portion shrinks outward due to gas pressure, the annular rib on the outer end and the cylindrical filter portion side is removed. There is no need to attach it.

  In the first end plate and the second end plate, annular ribs may be formed on both the inner end and the outer end on the cylindrical filter portion side. By forming annular ribs on both the inner and outer ends of the first end plate and the second end plate, the end of the cylindrical filter portion is surrounded by the end plate and the annular rib when bonded to the end plate. Since the adhesive can be held in the part, adhesion becomes easy. In the present invention, attachment of the annular ribs to both the inner end and the outer end on the cylindrical filter portion side is arbitrary.

  The gas filter element of the present invention may be provided with a cylindrical reinforcing member having a large number of gas permeation holes inside the cylindrical filter portion. In FIG. 9, a cylindrical reinforcing member 27 having a large number of gas permeation holes has a cylindrical shape, and has a number of gas permeation holes 28 as gas permeation holes on its wall surface. In FIG. 10, the gas filter element 10 a is provided with a cylindrical reinforcing member 27 shown in FIG. 9 inside the cylindrical filter portion 15. Both ends of the cylindrical reinforcing member 27 are bonded to the annular rib 17 and the annular rib 19 so that the space between the annular rib 17 of the first end plate 16 and the annular rib 19 of the second end plate 18 is sealed. Yes. Since a large number of gas permeation holes 28 are formed in the wall surface of the cylindrical reinforcing member 27, the gas that has passed through the cylindrical filter portion 15 passes through the gas permeation holes 28 to the inside of the gas filter element 10a. You can escape. The cylindrical reinforcing member having a large number of gas permeation holes plays a role as a reinforcing material against a vertical load applied to the cylindrical filter portion when the gas filter element is installed. The material of the cylindrical reinforcing member having a large number of gas permeable holes includes plated steel plate, metal such as stainless steel and aluminum, polyolefin resin such as polypropylene (PP) and polyethylene (PE), and polyester resin such as polyethylene terephthalate (PET). And synthetic resins such as fluororesins such as polytetrafluoroethylene (PTFE) and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA). In addition, when the first end plate and the second end plate are made of metal and the cylindrical reinforcing member having a large number of gas permeation holes is made of metal, the first end plate and the second end plate are made cylindrical. The reinforcing member is preferably sealed by welding. When the first end plate and the second end plate are made of synthetic resin and the cylindrical reinforcing member having a large number of gas permeable holes is made of synthetic resin, the first end plate, the second end plate, and the cylinder The shape-like reinforcing member is preferably sealed by an adhesive or fusion. FIG. 9 is a schematic perspective view showing an example of a cylindrical reinforcing member having a large number of gas permeation holes. FIG. 10 is a schematic end view showing an example of a gas filter element provided with the cylindrical reinforcing member in FIG. 9. When the gas filter element of the present invention is not provided with a cylindrical reinforcing member having a large number of gas permeation holes inside the cylindrical filter portion, the gas filter in which the gas filter element of the present invention is installed A member that performs the same function as a cylindrical reinforcing member having a large number of gas permeation holes may be installed in the structure.

  The gas filter element of the present invention is installed in a gas flow path in an apparatus such as a gas filter or a governor. And the gas filter element of this invention is installed in the gas filter and apparatus comprised so that to-be-processed gas may be ventilated toward the inner side from the outer side of a gas filter element.

  1 is an embodiment in which the processing gas inside the gas filter element is discharged only from one end on the inside of the gas filter element. However, in the gas filter element of the present invention, the gas filter element is used. The processing gas that has passed through the inside of the gas filter element can be exhausted from both ends of the gas filter element to the outside of the housing of the gas filter structure. It can also be discharged. In the case of an embodiment in which the processing gas inside the gas filter element is discharged from only one end inside the gas filter element, the processing gas inside the gas filter element is at the gas filter element at both ends inside the gas filter element. Of the gas filter structure is sealed by a sealing member for preventing flow into the casing of the gas filter structure, and a processing gas exhaust pipe insertion port is provided on the processing gas discharge side sealing member. It is formed. In addition, when the processing gas inside the gas filter element is exhausted from both ends inside the gas filter element, the inside processing gas inside the gas filter element is outside the filter element of the gas filter element. Further, the gas filter structure is sealed by a sealing member for preventing the gas filter structure from flowing into the space, and an insertion port for the exhaust pipe for the processing gas is formed in each of the sealing members at both ends. . When a plurality of gas filter elements are connected in series as in the embodiment shown in FIG. 11, the end on the connection side inside the gas filter element is treated with the processing gas inside the gas filter element. Sealed by a sealing member for preventing the gas from flowing into the outer space of the filter element of the filter and in the housing of the gas filter structure, and the inner side of the gas filter element is connected to the sealing member on the connection side. An insertion port for the connecting member to be connected is formed. In the embodiment shown in FIG. 11, the inside of the gas filter elements 10 and 10 are connected by a connecting pipe 29, and the gas filter elements 10 and 10 are connected in series. FIG. 11 is a schematic end view of an embodiment in which gas filter elements are connected in series.

  The gas to be treated that is processed using the gas filter element of the present invention is produced by fermentation decomposition of waste such as liquefied natural gas (LNG), non-liquefied natural gas, city gas, sewage sludge, and raw garbage. Examples include gases containing a large amount of low molecular weight fuel gas such as methane such as biogas and gas synthesized from coal, and ethane.

  The gas filter element of the present invention is suitably used for a high pressure gas to be processed having a pressure of 1.0 to 9.8 MPa and a gas to be processed having a medium pressure of 0.3 to 1.0 MPa.

DESCRIPTION OF SYMBOLS 1 Gas filter structure 2 Upper sealing plate 3 Support part 4 Process gas discharge pipe 5 Lower sealing plate 6 Processed gas supply pipe 7 Case part upper cover part 8 Case part lower cover part 9 Case part cylindrical part 10 10a Gas filter element 11 Space in housing 12 Inside of gas filter element 13 Fixing bolt 14 Flange portion 15 Cylindrical filter portion 16 First end plate 17, 19, 37, 39 Annular rib 18 Second end plate 20 Gas to be treated 21 Processing gas 22, 22a, 22b Laminated body 23 Non-woven fabric of activated carbon fiber 24 Sheet-shaped dust filter medium 26 Reinforcing wire mesh 27 Cylindrical reinforcing member 28 having a large number of gas permeation holes 28 Gas permeation holes 29 Connecting member 30 Pitch 31 Pleated thickness

Claims (8)

A cylindrical filter portion through which gas to be treated is vented from the outside to the inside, and provided on one end side of the cylindrical filter portion, has a substantially annular and flat plate shape, and one end of the cylindrical filter portion, A first end plate that seals one end side of the cylindrical filter portion by bonding, and is provided on the other end side of the cylindrical filter portion, and has a substantially annular and flat plate shape. A second end plate that seals the other end side of the cylindrical filter portion by being bonded to the other end of the cylindrical filter portion,
The cylindrical filter portion is composed of a laminate of a sheet-shaped dust removal filter medium and an activated carbon fiber nonwoven fabric, and the laminate processed into a pleated shape has the activated carbon fiber nonwoven fabric disposed on the outer side and the inner side of the laminate. The sheet-shaped dust removal filter medium is arranged so that it is a molded body formed into a cylindrical shape,
Gas filter element characterized by   2. The gas filter element according to claim 1, wherein the sheet-shaped dust removal filter medium is a filter medium obtained by laminating a fluororesin membrane and a nonwoven fabric of polyethylene terephthalate, polyethylene, polyester, or fluororesin.   The gas filter element according to claim 1, wherein the sheet-shaped dust removal filter medium is a glass fiber nonwoven fabric.   2. The gas filter element according to claim 1, wherein the sheet-shaped dust removal filter medium is a medium performance filter medium having a collection rate of 65 to 95% in a color method test based on JIS B 9908. 3.   The gas filter element according to claim 1, wherein the sheet-shaped dust removal filter medium is a HEPA filter medium defined in JIS Z8122.   The gas filter element according to any one of claims 1 to 5, wherein a reinforcing metal mesh for the laminated body is attached to a surface of the laminated body on the sheet-like dust-removing filter medium side.   The gas filter element according to any one of claims 1 to 5, wherein a reinforcing wire mesh for the laminated body is attached to both surfaces of the laminated body.   The gas filter element according to claim 1, wherein a cylindrical reinforcing member having a large number of gas permeation holes is provided inside the cylindrical filter.

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