Antistatic filter cloth, filter bag and bag cage

Abstract

The utility model relates to anti-static filter cloth, a filter bag and a bag cage. The anti-static filter cloth comprises anti-static yarns spun by polyphenylene sulfide fibers and stainless steel fibers, the polyphenylene sulfide yarns and the anti-static yarns are woven into the anti-static base cloth layer according to a specific proportion and at intervals; polyphenylene sulfide fibers are carded into an upper-layer cotton net and a lower-layer cotton net, an antistatic base cloth layer and tens of thousands of steel needles with barbs are added between the upper-layer cotton net and the lower-layer cotton net, the fibers are wound and hooked up and down to form a non-woven fabric with certain density and strength, and the non-woven fabric is subjected to post-treatment to prepare the antistatic filter cloth. The filter bag is made of the antistatic filter cloth and is used for a dust remover in the coal chemical industry. And the bag cage is used for fixing the filter bag. The bag cage has excellent conductivity, can conduct static electricity generated in the coal chemical industry, especially in a pulverized coal collector, to the body steel structure through the bag cage, on one hand, can prevent pulverized coal from burning and damaging a filter bag due to the static electricity, and on the other hand, can prevent pulverized coal from burning or exploding due to electrostatic sparks.

Description

Technical Field

[0001] This utility model relates to an antistatic filter cloth, filter bag, and bag cage, and particularly to a filter cloth used in antistatic filter bags for coal powder collectors in the coal chemical industry, belonging to the technical field of dust removal and filtration. Background Technology

[0002] Antistatic filter bags are widely used in coal-fired power plants, coal chemical industry, cement industry, steel industry, and other industries, with the coal chemical industry having the largest demand for them. The materials used for antistatic filter bags vary depending on the specific working conditions in each industry.

[0003] In coal application, coal is typically ground into powder of a certain particle size using a coal mill. This powder is then transported by a circulating fan to a pulverized coal collector for collection and further processing. Pulverized coal preparation is a crucial step in coal gasification processes such as coal-to-olefins, coal-to-oil, coal-to-aromatics, and coal-to-ethylene glycol. Key performance indicators of pulverized coal collectors include dust emission concentration, explosion-proof performance, and pulverized coal throughput. Unstable operating conditions of the pulverized coal collector can lead to filter bag damage, primarily due to filter media oxidation and high-temperature carbonization. Frequent filter bag damage during use can result in excessive dust emissions, necessitating frequent shutdowns for maintenance and filter bag replacement. Short replacement cycles for the filter bags in the pulverized coal collector will severely impact the stability of the production line.

[0004] According to research, my country's coal chemical industry is developing rapidly. The Ningdong Coal Chemical Base of Ningxia Coal Industry alone has installed and put into operation 50 coal dust collectors, requiring approximately 100,000 antistatic filter bags. Currently, these coal dust collectors generally use antistatic PPS filter bags. Due to differences in manufacturing processes among manufacturers, their service life varies. Some coal dust collectors use filter bags originally manufactured by BWF in Germany, but because German filter bags are relatively expensive, their service life is only 1-2 years. Currently, domestically produced antistatic filter bags mainly include: polyester antistatic filter bags, polypropylene antistatic filter bags, acrylic antistatic filter bags, PPS antistatic filter bags, aramid antistatic filter bags, and PTFE antistatic filter bags. Domestically produced polyester antistatic filter bags almost all fail and break after about 3 months of use; fiberglass composite filter bags are also used in coal dust collectors, and damage frequently occurs at the bottom and near the bag opening. To date, the lifespan of domestically produced filter bags generally does not reach one year.

[0005] In order to meet the needs of coal chemical industry bases and expand the application market of filter bags, change the previous use of only a single material, improve the service life of antistatic filter bags for coal powder collectors, extend the maintenance filter bag replacement cycle, reduce the dust emission concentration of coal powder collectors, and avoid coal powder combustion or explosion caused by electrostatic sparks, it is necessary to develop new antistatic filter cloths. Utility Model Content

[0006] To address the aforementioned problems, this utility model discloses an antistatic filter cloth, filter bag, and bag cage, the specific technical solution of which is as follows:

[0007] An antistatic filter cloth includes a fiber surface layer (301), an antistatic base layer (20), and a fiber bottom layer (302). The antistatic base layer (20) is sandwiched between the fiber surface layer (301) and the fiber bottom layer (302). The fiber surface layer (301), the antistatic base layer (20), and the fiber bottom layer (302) are pierced by needles, and their adjacent contact surfaces are intertwined and hooked together.

[0008] Furthermore, the antistatic base fabric layer (20) includes polyphenylene sulfide yarn (201) and antistatic yarn (202), and the antistatic base fabric layer (20) is formed by weaving the polyphenylene sulfide yarn (201) and antistatic yarn (202) into a fabric by a weaving machine.

[0009] Furthermore, the mass ratio of polyphenylene sulfide yarn (201) to antistatic yarn (202) in the antistatic base fabric layer (20) is 7:3; the antistatic base fabric layer (20) has one antistatic yarn (202) every 10 mm in both the radial and weft directions according to the polyphenylene sulfide yarn (201).

[0010] Furthermore, both the fiber surface layer (301) and the fiber bottom layer (302) comprise polyphenylene sulfide fiber and stainless steel fiber, and both the fiber surface layer (301) and the fiber bottom layer (302) are made of a blend of polyphenylene sulfide fiber and stainless steel fiber.

[0011] Furthermore, the mass ratio of polyphenylene sulfide fiber to stainless steel fiber in the fiber surface layer (301) and fiber bottom layer (302) is 9:1.

[0012] Furthermore, the stainless steel fiber is a conductive fiber, made of 316L stainless steel, with a fiber diameter of 12 micrometers, a temperature resistance of 650℃, and a melting point of 1350℃.

[0013] Furthermore, the thickness of both the fiber surface layer (301) and the fiber bottom layer (302) is greater than the thickness of the antistatic base fabric layer (20); the thickness of the fiber surface layer (301) is greater than the thickness of the fiber bottom layer (302), and the fiber surface layer (301) is the side facing the dust-laden gas.

[0014] Furthermore, a support layer is provided on the surface of the fiber surface layer (301), which is composed of disordered interconnected PPS fibers.

[0015] Furthermore, this utility model also applies for protection of a filter bag prepared from the above-mentioned antistatic filter cloth.

[0016] Furthermore, this utility model also applies for protection of a bag cage used with the above-mentioned filter bag. The bag cage (40) is a cylindrical frame that runs vertically through the top and bottom, with several supporting connecting rods (401) around its perimeter. Two rings of cylindrical mounting rings (403) with equal outer diameters are provided around one end of the cylindrical frame. A gap is reserved between the two rings of mounting rings (403), which are connected by several outwardly rectangular or curved connecting rods (404). The other end is surrounded by... A snap ring (402) with an outer diameter larger than that of a cylinder is provided. When in use, the filter bag is put on the outside of the bag cage (40). One end of the filter bag is wrapped and sewn inside the snap ring (403), and the other end is wrapped and sewn outside the snap ring (402). When the bag cages (40) are spliced, the snap ring (402) is inserted into the middle of the two snap rings (403) of the adjacent bag cages. The outer side of the snap ring (402) abuts against the connecting rod (404).

[0017] The beneficial effects of this utility model are:

[0018] This invention improves antistatic performance, enabling rapid electrostatic charge conduction and preventing the accumulation of large amounts of charge that could ignite coal dust. This enhances the safety factor of the coal dust collector, effectively ensuring safe production. The nano-antistatic agent impregnation improves the smoothness and flatness of the filter bag surface, reducing coal dust accumulation and mitigating the heat accumulation effect of electrostatic smoldering. This effectively reduces high-temperature carbonization of the filter media and extends the filter bag's service life.

[0019] This invention changes the previous single-material antistatic filter bag by leveraging the complementary properties of various materials to improve the antistatic filter bag's temperature and acid / alkali resistance, reduce coal dust loss, and reduce environmental dust pollution.

[0020] This utility model features a bag cage with snap rings and seat rings at both ends, allowing the two ends of the bag cage to be spliced ​​together during use. This design is simple to operate, quick to assemble, and secure. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the present invention.

[0022] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0023] Figure 3 This is a schematic diagram of the bag cage structure of this utility model.

[0024] List of reference numerals in the attached diagram: 20—Antistatic base fabric layer, 201—Polyphenylene sulfide yarn, 202—Antistatic yarn, 301—Fiber surface layer, 302—Fiber bottom layer, 40—Bag cage, 401—Supporting rod, 402—Snap-on ring, 403—Card holder ring, 404—Connecting rod. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0026] Combined with appendix Figure 1-2 As can be seen, the thickness of each layer in the figure, the interweaving method of the antistatic filter cloth layers, and the morphology of the fiber surface layer 301 and the fiber bottom layer 302 are all schematic and not actual examples. The antistatic filter cloth disclosed in this utility model includes a fiber surface layer 301, an antistatic base fabric layer 20, and a fiber bottom layer 302. The antistatic base fabric layer 20 is sandwiched between the fiber surface layer 301 and the fiber bottom layer 302. The fiber surface layer 301, the antistatic base fabric layer 20, and the fiber bottom layer 302 are repeatedly pierced by a needle, with the needle being a No. 38 or No. 40 needle. The adjacent contact surfaces of the fiber surface layer 301, the antistatic base fabric layer 20, and the fiber bottom layer 302 are intertwined and hooked together, with a peel strength of 5-15 N / 25 mm.

[0027] The characteristics of each layer will be introduced below:

[0028] The antistatic base fabric layer 20 includes polyphenylene sulfide yarn 201 and antistatic yarn 202, which are woven into a fabric by a loom.

[0029] As a better ratio choice, the mass ratio of polyphenylene sulfide yarn 201 to antistatic yarn 202 in the antistatic base fabric layer 20 is 7:3.

[0030] As a good weaving blend ratio, the antistatic base fabric layer 20 has one antistatic yarn 202 every 10 mm in both the radial and weft directions, according to the polyphenylene sulfide yarn 201.

[0031] Both the fiber face layer 301 and the fiber back layer 302 include polyphenylene sulfide fibers and stainless steel fibers, and both the fiber face layer 301 and the fiber back layer 302 are made of polyphenylene sulfide fibers and stainless steel fibers blended together.

[0032] As a better ratio choice, the mass ratio of polyphenylene sulfide fiber to stainless steel fiber in fiber surface layer 301 and fiber bottom layer 302 is 9:1.

[0033] Stainless steel fiber is a conductive fiber. As a better choice of stainless steel fiber, it is made of 316L stainless steel with a fiber diameter of 12 micrometers, a temperature resistance of 650℃, and a melting point of 1350℃.

[0034] The thickness of both the fiber surface layer 301 and the fiber bottom layer 302 is greater than the thickness of the antistatic base fabric layer 20; the thickness of the fiber surface layer 301 is greater than the thickness of the fiber bottom layer 302, and the fiber surface layer 301 is the side facing the dust-laden gas.

[0035] As a preferred option for this utility model, the thickness of the antistatic base fabric layer 20 is 1.0-1.8mm, and the thickness of the fiber surface layer 301 and the fiber bottom layer 302 is 1.8-2.2mm.

[0036] As an option for specific use of this utility model, a support layer (not shown in the figure) is also provided on the surface of the fiber surface layer 301. The support layer is composed of randomly interlocked PPS fibers. As a preferred option for this utility model, the thickness of the support layer is 0.2-0.7mm. In actual use, the support layer provides a certain stiffness. When using the filter cloth of this utility model as a filter bag material, the support layer faces the airflow direction containing coal powder. The particulate matter in the airflow containing coal powder is trapped on the support layer. As the airflow containing coal powder passes through the fiber surface layer 301, the antistatic base cloth layer 20, and the fiber bottom layer 302, the coal powder particles are trapped layer by layer, and the coal powder particles in the airflow are destaticated to prevent high-temperature friction explosion. When a thick layer of particles accumulates on the support layer, the particle layer is shaken off by vibration. When the filter cloth reaches the end of its service life, it can be replaced.

[0037] Using No. 38 or No. 40 needles can better comb and entangle the fibers, making the filter cloth structure tighter, while avoiding excessive damage to the fibers.

[0038] This utility model also applies for protection of a filter bag prepared from the above-mentioned antistatic filter cloth.

[0039] See appendix Figure 3 This utility model also applies for protection of a bag cage used with the above-mentioned filter bag. The bag cage 40 is a cylindrical frame that runs vertically through the frame and has several supporting connecting rods 401 around its perimeter. One end of the cylindrical frame is provided with two rings of cylindrical mounting rings 403 with the same outer diameter. A gap is reserved between the two rings of mounting rings 403, which are connected by several outwardly rectangular or curved connecting rods 404. The other end is provided with a ring of buckle rings 402 with an outer diameter larger than the cylindrical rings. In use, the filter bag is placed over the bag cage 40. One end of the filter bag is wrapped and sewn inside the mounting rings 403, and the other end is wrapped and sewn outside the buckle rings 402. When the bag cages 40 are assembled, the buckle rings 402 are engaged between the two rings of mounting rings 403 of the adjacent bag cages. The outer side of the buckle rings 402 abuts against the connecting rods 404 to prevent the buckle rings 402 from shaking.

[0040] As a specific option for the bag cage of this utility model, the buckle ring 402, the seat ring 403 and the connecting rod 404 can be formed by bending rods with a cross-section of circular, rectangular, oblong or elliptical, or with a crescent-shaped cross-section. When it is crescent-shaped, the inner side of the crescent-shaped cross-section faces the inner side of the bag cage, which can better protect the antistatic filter cloth from being worn at the connection.

[0041] To accommodate the diameters of the snap-fit ​​rings 402 and 403, the filter bag has its diameter enlarged at both ends. This ensures that there is sufficient clearance at both ends of the filter bag when the snap-fit ​​rings 402 and 403 engage. Furthermore, the maximum allowable diameter at both ends of the filter bag is no more than 1mm larger than the outer diameter of the snap-fit ​​ring 402, ensuring better tension and a more stable connection.

[0042] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0043] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An antistatic filter cloth, characterized in that, It comprises a fiber surface layer (301), an antistatic base cloth layer (20) and a fiber bottom layer (302), the antistatic base cloth layer (20) is sandwiched between the fiber surface layer (301) and the fiber bottom layer (302), the fiber surface layer (301), the antistatic base cloth layer (20) and the fiber bottom layer (302) are reciprocally pierced by a needle, and are hook-connected on the adjacent contact surfaces.

2. The anti-static filter cloth according to claim 1, wherein, The antistatic base cloth layer (20) comprises polyphenylene sulfide yarn (201) and antistatic yarn (202), and the antistatic base cloth layer (20) is formed by weaving the polyphenylene sulfide yarn (201) and the antistatic yarn (202) into cloth by a loom.

3. The anti-static filter cloth according to claim 2, wherein, The mass ratio of the polyphenylene sulfide yarn (201) and the antistatic yarn (202) of the antistatic base cloth layer (20) is 7:3, and the radial direction and the weft direction of the antistatic base cloth layer (20) are according to the polyphenylene sulfide yarn (201) every 10 mm with 1 antistatic yarn (202).

4. The anti-static filter cloth according to claim 1, wherein, The fiber surface layer (301) and the fiber bottom layer (302) each comprise polyphenylene sulfide fiber and stainless steel fiber, and the fiber surface layer (301) and the fiber bottom layer (302) are each formed by blending the polyphenylene sulfide fiber and the stainless steel fiber.

5. The anti-static filter cloth according to claim 4, wherein, The mass ratio of the polyphenylene sulfide fiber and the stainless steel fiber in the fiber surface layer (301) and the fiber bottom layer (302) is 9:

1.

6. The anti-static filter cloth according to claim 4, wherein, The stainless steel fiber is a conductive fiber, is made of 316L stainless steel material, has a fiber diameter of 12 microns, can resist a temperature of 650 DEG C, and has a melting point of 1350 DEG C.

7. The anti-static filter cloth according to claim 1, wherein, The thicknesses of the fiber surface layer (301) and the fiber bottom layer (302) are each greater than the thickness of the antistatic base cloth layer (20), the thickness of the fiber surface layer (301) is greater than the thickness of the fiber bottom layer (302), and the fiber surface layer (301) is a side facing the dust-containing gas.

8. The anti-static filter cloth of claim 1, wherein, The surface of the fiber surface layer (301) is further provided with a support layer, and the support layer is composed of PPS fiber disorderly hook-connected.

9. A filter bag prepared from the antistatic filter cloth according to any one of claims 1-8.

10. A pocket cage for use in a filter bag according to claim 9, characterised in that The bag cage (40) is a cylindrical frame penetrating from top to bottom, and is provided with a plurality of support connecting rods (401) around the periphery, the cylindrical frame is provided with two circles of clamping seat rings (403) with the same diameter around the periphery at one end, a gap is reserved between the two circles of clamping seat rings (403), a plurality of connecting rods (404) are connected outward in a rectangular or house-shaped curve, and a clamping buckle ring (402) with a larger outer diameter than the cylindrical frame with the same diameter is arranged around the periphery at the other end, in use, the filter bag is sleeved outside the bag cage (40), one end of the filter bag is wrapped and sewn on the inner side of the clamping seat ring (403), and the other end is wrapped and sewn on the outer side of the clamping buckle ring (402), when the bag cages (40) are spliced, the clamping buckle ring (402) is clamped into the middle of the two circles of clamping seat rings (403) of the adjacent bag cages, and the outer side of the clamping buckle ring (402) abuts against the connecting rod (404).

Images