High-temperature dust removal bag and preparation method thereof

Abstract

The invention discloses a high-temperature dust removal bag and a preparation method, and belongs to the field of dust removal bags, the preparation method of the high-temperature dust removal bag comprises the following steps: S1, preparation of composite filament yarn: inorganic fiber yarn and heat-resistant alloy wire are doubled and twisted to obtain the composite filament yarn, and the obtained yarn is yarn A; s2, preparation of filament staple fiber composite yarn: wrapping the surface of the yarn A with inorganic staple fiber to prepare the filament staple fiber composite yarn which is yarn B; s3, preparing a composite woven body: compositely weaving the yarns B, the inorganic fiber yarns and the high-silica glass fiber filament yarns in an interlayer angle interlocking structure to form the composite woven body; s4, preparation of the dust removal bag: cutting and splicing the composite woven body, and covering the surface with a PTFE film to form the high-temperature dust removal bag.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature dust removal bags. Background Art

[0002] Dust bags play a vital role in industrial dust removal systems. They effectively filter and collect dust particles in the air, reduce pollutant emissions, protect the environment, and improve workers' working conditions to ensure the health and safety of industrial production processes. Especially in some heavily polluting industries, such as cement, steel, and chemicals, dust bags can effectively reduce the spread of harmful substances, meet environmental protection standards, and enhance corporate social responsibility and compliance. In addition, dust bags also improve equipment efficiency and reduce energy consumption by optimizing air circulation. Therefore, dust bags are not only a key component for environmental protection, but also an indispensable part of the production system.

[0003] Chinese patent CN221535981U discloses a high-efficiency dust bag, and Chinese patent CN117582744A discloses a gradient hierarchical structure emulsion coating ultra-low emission flue gas dust bag. However, most of the dust bags are currently used in exhaust gas dust removal environments below 250 degrees. For high-temperature environments of 500 to 600 degrees, the dust bags in traditional dust collectors may not be able to withstand high temperatures for a long time, which will cause the bag body to deform, burn or crack, affecting the dust removal effect and equipment safety. At the same time, the corrosion resistance of the current dust bag needs to be improved. The high-temperature environment will strengthen the acid and alkali corrosion of the dust bag, further reducing the performance of the dust bag.

[0004] The use of inorganic fibers, ceramic fibers, etc. to prepare dust bags can not only avoid acid and alkali corrosion but also can be used in high-temperature flue gas environments. Chinese patent CN219772430U discloses a bending device for glass fiber dust bag production, Chinese patent CN1614116A discloses a glass fiber dust bag sewing method, and Chinese patent CN101380818A discloses a polyphenylene sulfide fiber dust bag production method. Therefore, high-temperature corrosion-resistant dust bags have been widely used in China, but there is still no dust bag with a service life of 2 to 3 months and a temperature of 500-600 degrees to be directly used in high-temperature flue gas. Summary of the invention

[0005] The manufacturing method of the present invention is specifically used for manufacturing the dust removal bag, and the manufacturing method is as follows; it includes the following steps: S1 Preparation of high temperature resistant composite filament yarn; S2 Preparation of high temperature resistant filament staple fiber composite yarn; Preparation of S3 composite braid; S4. The woven body is cut and spliced ​​to form a dust bag; The step S1 comprises: twisting the inorganic fiber yarn 3 and the heat-resistant alloy wire 4 in parallel to obtain a composite filament yarn; Furthermore, the heat-resistant alloy wire is a nickel alloy wire or a stainless steel alloy wire, with a diameter of 0.1 to 0.5 mm and a thermal decomposition temperature of 1500°C or above; Furthermore, the inorganic fiber yarn 3 may be selected from one or more of glass fiber, quartz fiber, silicon carbide fiber, basalt fiber, alumina fiber, high silica glass fiber, silicate fiber, and its linear density is 60~240tex; Furthermore, the number of inorganic fiber yarns 3 during the doubling and twisting process is 1 to 5; the number of heat-resistant alloy wires is 1 to 5; the pulling speed during the doubling and twisting process is 10 to 50 m / min, and the twisting degree is 100 to 500 T / M; the yarn obtained by S1 is recorded as yarn A; The step S2 spins the yarn A and the inorganic staple fiber 2 by friction spinning, air spinning, ring spinning, or rotor spinning, so that the inorganic staple fiber 2 is evenly wrapped around the surface of the yarn A to obtain yarn B; Furthermore, if friction spinning is selected, the parameters of the friction spinning machine during the friction spinning process are set as follows: the feeding speed is 0.10-1.50 m / min, the combing roller speed is 1000-5000 r / min, the friction roller speed is 1000-5000 r / min, the output speed is 1.00-10.00 m / min, and the winding speed is 1.00-10.00 m / min; Furthermore, the inorganic short fibers 2 may be selected from one or more of glass fibers, quartz fibers, silicon carbide fibers, basalt fibers, alumina fibers, high silica glass fibers, and silicate fibers; Preparation of the composite braided body in step S3, the three yarns of the above yarn B, inorganic fiber yarn 3, and high silica glass fiber filament yarn are compositely braided into a fabric with an interlayer angle interlocking structure; Further, warp yarn Ⅰ and warp yarn Ⅱ use yarn B, warp yarn Ⅶ and warp yarn Ⅷ use high silica glass fiber filament yarn, warp yarn Ⅲ ~ Ⅵ use yarn B, high silica glass fiber filament yarn, inorganic fiber yarn 3 one or more thereof; Furthermore, the weft yarns used in the multi-layer composite braided body are numbered ① to ③, the weft yarn numbered ① uses yarn B, the weft yarn numbered ② uses inorganic fiber yarn 3, and the weft yarn numbered ③ uses high silica glass fiber yarn; Furthermore, the composite braided body is divided into 11, 12, 13 multi-layer structures with different functions. According to the above description, the top high-temperature heat-insulating and impact-resistant layer 11 is composed entirely of yarn B, the middle heat-insulating and reinforcing connecting layer 12 is composed of inorganic fiber yarn 3 combined with yarn B, the bottom high-temperature dust removal and filtration layer is composed of high-silica glass fiber yarn, and the bottom surface of the bottom layer has a coating layer 5 of PTFE film, and the total number of layers of the composite braided body is 3 to 15; The step S4 is to cut and splice the braided body to form a dust removal bag, wherein the braided body is cut and spliced ​​to form a cylindrical shape, and the braided body has a certain overlap at the splicing position; Furthermore, inorganic glue is used to bond the braided body at the overlapping part of the braided body, and the inorganic glue is one or more of sodium silicate glue, calcium silicate glue, aluminum silicate glue, and aluminum silicate glue; The high-temperature dust removal bag provided by the present invention has the characteristics of being resistant to bending, having a long service life and being able to be continuously used for 3-6 months, having a good dust removal effect, and being able to be directly used for dust removal at a high temperature of 600 degrees; The heat-resistant alloy wire and the inorganic fiber yarn 3 are twisted in parallel to form the yarn A, and the yarn A is used as the core yarn of the yarn B, which enhances the tensile breaking strength of the yarn B at room temperature and high temperature and has stronger anti-bending performance. The inorganic short fiber 2 is coated on the surface of the yarn A to enhance the high-temperature heat insulation performance of the yarn B. At the same time, combined with the selected material characteristics, the top layer 11 of the composite braided body formed by the yarn B has better high-temperature resistance, heat insulation, anti-scouring, anti-bending and other properties, and is suitable for corrosion-resistant high-temperature dust removal bags; The second layer of the braided body is composed of inorganic fiber yarn 3 combined with yarn B; the inorganic fiber yarn 3 has better strength and tensile properties than yarn B, so that the three braided layers are tightly combined together, and the addition of yarn B also makes the second layer have a certain heat insulation performance and supplements a certain toughness, further enhancing the high temperature resistance, heat insulation and anti-scouring, bending resistance and other properties of the braided body; the braided body can be stably used for 3-6 months under the high temperature of 600°C and the high temperature airflow scouring of -100pa~100pa pressure; The third layer of the braided body is composed of high-silica glass fiber yarn and is covered with a PTFE film on the lower surface; compared with the high-silica glass fiber yarn, the inorganic fiber yarn 3 has better tensile strength and toughness, lower production cost, and better processing performance, and can also work stably at high temperatures, and cooperates with the PTFE film covered on the surface to achieve high-temperature smoke filtration performance of the braided body. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a schematic diagram of yarn A; Figure 2 is a schematic diagram of yarn B; Figure 3 and Figure 4It is a schematic diagram of the organization structure of the composite braided body; Figure 5 This is a schematic diagram of high temperature dust bag equipment; Markings in the figure: 2: inorganic staple fiber yarn, 3: inorganic fiber yarn, 4: heat-resistant alloy wire, 5: PTFE film, 6: high-temperature dust removal bag, 11: high-temperature thermal insulation and impact-resistant layer, 12: thermal insulation reinforcement connection layer, 13: high-temperature dust removal filter layer. DETAILED DESCRIPTION

[0007] The present invention is described in detail below in conjunction with the accompanying drawings.

[0008] Embodiment 1: The manufacturing method of the present invention is specifically used for manufacturing the dust removal bag, and the manufacturing method is as follows; it includes the following steps: S1 Preparation of high temperature resistant composite filament yarn; S2 Preparation of high temperature resistant filament staple fiber composite yarn; Preparation of S3 composite braid; S4. The woven body is cut and spliced ​​to form a dust bag; The step S1 comprises: twisting the inorganic fiber yarn 3 and the heat-resistant alloy wire 4 in parallel to obtain a composite filament yarn; the heat-resistant alloy wire is a nickel alloy wire with a diameter of 0.2 mm and a thermal decomposition temperature of 800°C; the inorganic fiber yarn 3 is glass fiber with a linear density of 120 tex; the number of inorganic fiber yarns 3 during the parallel twisting process is 2; the number of heat-resistant alloy wires is 2; the pulling speed during the parallel twisting process is 35 m / min, and the twisting twist is 200 T / M; the obtained yarn is recorded as yarn A.

[0009] The step S2 is spinning the yarn A and the inorganic short fibers 2 by a friction spinning machine, so that the inorganic short fibers 2 are evenly wrapped on the surface of the yarn A to obtain yarn B; Furthermore, during the friction spinning process, the parameters of the friction spinning machine are set as follows: the feeding speed is 0.45 m / min, the combing roller speed is 3500 r / min, the friction roller speed is 3500 r / min, the output speed is 5.00 m / min, and the winding speed is 5.00 m / min; the inorganic short fiber 2 is alumina fiber; the linear density of alumina fiber is 60 tex, and the length is 3-10 mm; The preparation of the composite braid in step S3 is as follows: Figure 3As shown, the above-mentioned yarn B, inorganic fiber yarn 3, high silica glass fiber filament yarn three kinds of yarns are compositely woven to form a fabric with an interlayer angle interlocking structure; warp yarns Ⅰ~Ⅳ are selected from yarn B, warp yarns Ⅴ~Ⅷ are selected from high silica glass fiber filament yarns, and the weft yarns used in the multi-layer composite braided body are numbered ①~③, the weft yarn numbered ① uses yarn B, the weft yarn numbered ② uses inorganic fiber yarn 3, and the weft yarn numbered ③ uses high silica glass fiber yarn; The composite braided body is divided into 11, 12, 13 multi-layer structures with different functions, and the lower surface of the lowermost layer has a coating layer 5 which is a PTFE film; The step S4 cuts and splices the braided body to form a dust removal bag, which is characterized in that the braided body is cut and spliced ​​to form a cylindrical shape, and the braided body has a certain overlap at the splicing point; further, the braided body is bonded at the overlapping part of the braided body using inorganic glue, and the inorganic glue is aluminum silicate glue.

[0010] The filter bag provided by the present invention is compared with a common high temperature resistant dust removal filter bag on the market; Comparison filter bag 1: FMS filter bag, with high tensile strength, high temperature resistance, acid and alkali corrosion resistance, is made of polyimide (P84), polyphenylene sulfide (PPS), PTFE fiber and alkali-free glass fiber blended composite; continuous use temperature: 180~220℃ (strong acid resistant type) or ≤300℃ (strong high temperature resistant type) stable use for 2 weeks; instantaneous temperature: 240℃ (standard type) or 400℃ (high temperature type); gram weight: 800~900 g / m²; mechanical properties: warp tension 1000 N / 10 cm, weft tension 1000 N / 10 cm; thickness: 2.5~3.0 mm.

[0011] Comparison filter bag 2: PPS (polyphenylene sulfide) filter bag, chemical corrosion resistance (especially resistance to sulfur oxides); continuous use temperature: ≤170℃, stable use for 1 month, maximum instantaneous temperature 190~200℃; weight: 500~550 g / m²; mechanical properties: warp tension 500N / 10 cm, weft tension 600 N / 10 cm; thickness: 1.8 mm.

[0012] Comparison filter bag 3: PPS+PTFE composite filter bag, PPS fiber and PTFE fiber are mixed (usually in a ratio of 50%:50%); continuous use temperature: ≤190℃, used for 1 month, the highest instantaneous temperature is 220℃; gram weight: ≥600 g / m²; warp breaking strength>800 N / 5cm, weft breaking strength>1100 N / 5cm; thickness: 2.5 mm.

[0013] Comparison filter bag 4: P84 (polyimide) filter bag, continuous use temperature: ≤260℃, used for 1 month, maximum instantaneous temperature 280℃; weight: 550 g / m²; longitudinal breaking strength 1200 N / 10cm, transverse breaking strength 700 N / 10cm; thickness: 2.0~2.5 mm.

[0014] The high-temperature dust removal bag woven filter bag provided in this embodiment was tested. Combustible materials such as wood, plastic, and chemical fiber were collected and supplemented with a small amount of alcohol to conduct a combustion experiment in a prepared combustion chamber. An airflow of 100pa was used to assist the flue gas to pass through the test instrument. The flue gas generated by the combustion was tested using a portable smoke tester in accordance with the "Emission Standards for Air Pollutants in Coking Chemical Industry" (GB 16171.1-2024). The flue gas temperature generated during combustion was 597°C and the smoke concentration was 1390g / m 3 After dust removal by filter bags, the smoke concentration was tested to be 21 mg / m³, which meets the emission standards.

[0015] The high-temperature dust bag woven filter bag provided by the present invention can be stably used for 4 months under the high temperature of 600°C and the high temperature airflow of 100Pa pressure, and can be stably used for 6 months under the high temperature of 500°C and the high temperature airflow of 100Pa pressure; the dust bag size is φ130×1800mm (can be changed according to demand); the warp density of the dust bag woven body is 54~72 strands / 10cm, and the weft density is 57~31 strands / 10cm; the longitudinal breaking strength is 1500 N / 10cm, and the transverse breaking strength is 1100 N / 10cm; the unit area mass is 900~1100 (g / m 2 ); thickness is 1.5~2.5mm; compared with the above-mentioned comparative filter bags, the high-temperature dust removal bag woven filter bag provided by the present invention can be used for a longer time at high temperatures of 500°C and above, innovatively breaking through the use environment of the filter bag, while having a long service life and better mechanical properties, and having better performance at the same quality or thickness.

[0016] Embodiment 2: The manufacturing method of the present invention is specifically used for manufacturing the dust removal bag, and the manufacturing method is as follows; it includes the following steps: S1 Preparation of high temperature resistant composite filament yarn; S2 Preparation of high temperature resistant filament staple fiber composite yarn; Preparation of S3 composite braid; S4. The woven body is cut and spliced ​​to form a dust bag; The step S1 comprises: twisting the inorganic fiber yarn 3 and the heat-resistant alloy wire 4 to obtain a composite filament yarn; the heat-resistant alloy wire is a nickel alloy wire with a diameter of 0.1 mm and a thermal decomposition temperature of 800°C; the inorganic fiber yarn 3 is glass fiber with a linear density of 100 tex; Furthermore, the number of inorganic fiber yarns 3 during the parallel twisting process is 1; the number of heat-resistant alloy wires is 1; the pulling speed during the parallel twisting process is 15 m / min, and the twisting degree is 150 T / M; the yarn obtained by S1 is recorded as yarn A; The step S2 is spinning the yarn A and the inorganic short fibers 2 by a friction spinning machine so that the inorganic short fibers 2 are evenly wrapped around the surface of the yarn A to obtain yarn B; Furthermore, during the friction spinning process, the parameters of the friction spinning machine were set as follows: the feeding speed was 0.3 m / min, the combing roller speed was 3000 r / min, the friction roller speed was 3000 r / min, the output speed was 5.00 m / min, and the winding speed was 5.00 m / min; the inorganic short fiber 2 was alumina fiber; The preparation of the composite braided body in step S3 is as follows: Figure 4 ; The above-mentioned yarn B, inorganic fiber yarn 3, three kinds of yarns are compositely woven with interlayer angle interlocking structure to form a fabric; further, warp yarn Ⅰ and warp yarn Ⅱ are selected from yarn B, warp yarn Ⅶ and warp yarn Ⅷ are selected from high silica glass fiber filament yarn, warp yarn Ⅲ~Ⅵ are selected from yarn B, inorganic fiber yarn 3, high silica glass fiber filament yarn, high silica glass fiber filament yarn respectively; the weft yarns used in the multi-layer composite braided body are numbered ①~③, the weft yarn numbered ① is yarn B, the weft yarn numbered ② is inorganic fiber yarn 3, and the weft yarn numbered ③ is high silica glass fiber yarn; The composite braided body is divided into 11, 12, 13 multi-layer structures with different functions, and the lower surface of the lowest layer has a coating layer 5 which is a PTFE film; The step S4 cuts and splices the braided body to form a dust removal bag, which is characterized in that the braided body is cut and spliced ​​to form a cylindrical shape, and there is a certain overlap of the braided body at the splicing point; further, the braided body is bonded with inorganic glue at the overlapping part of the braided body, and the inorganic glue is aluminum silicate glue.

[0017] The high-temperature dust removal bag woven filter bag provided in this embodiment was tested, and combustible materials such as wood, plastic, and chemical fiber were collected and supplemented with a small amount of alcohol to carry out a combustion experiment in a prepared combustion chamber. The flue gas generated by the combustion was tested using a portable smoke tester with reference to the "Emission Standards for Air Pollutants from Coking Chemical Industry" (GB 16171.1-2024). The flue gas temperature generated during combustion was 614°C, and the smoke concentration was 1376g / m3. After dust removal by the filter bag, the smoke concentration was tested to be 16 mg / m³, which met the emission standards.

[0018] Comparative Example 1: The difference between the dust removal bag preparation method and Example 2 is that yarn B is replaced by yarn A in Example 2, and other processes and methods are the same to prepare the braided body and the dust removal bag.

[0019] According to the high-temperature dust bag woven filter bag provided in the above steps, when the thickness of the high-temperature dust bag woven filter bag provided in Example 2 is the same as 2.0 mm, the high-temperature dust bag woven filter bag provided in Example 1 is tested, combustibles such as wood, plastic, and chemical fiber are collected and supplemented with a small amount of alcohol to carry out a combustion experiment in the prepared combustion chamber, and an airflow of 100 Pa is used to assist the flue gas to pass through the test instrument. The flue gas generated by the combustion is tested using a portable smoke tester with reference to the "Emission Standards for Air Pollutants in Coking Chemical Industry" (GB 16171.1-2024). The flue gas temperature generated during combustion is 583°C, and the smoke concentration is 1331g / m 3 After the filter bag dust removal, the smoke concentration was tested to be 612 mg / m³; In a high temperature airflow environment of 600°C and 100 Pa pressure, the dust removal and filtering performance is only about 47% of the high temperature dust removal bag braided filter bag provided by the present invention, which is far from meeting the requirements for the use of the filter bag.

[0020] Comparative Example 2: The selection and dosage of raw materials such as yarn B, inorganic fiber yarn 3, and high silica glass fiber and the preparation are the same as in Example 2, except that, in step S3, the preparation of the multilayer braided body is performed by forming a fabric with the above-mentioned yarn B, inorganic fiber yarn 3, and high silica glass fiber filament yarn in a plain weave structure; The high-temperature dust bag woven filter bag provided according to the above steps is different from the high-temperature dust bag woven filter bag provided in Example 2 in the structure of the woven body. Comparative Example 2 is a single multi-layer bonding structure, and the bonding performance between the layers is poor. When the high-temperature dust bag woven filter bag provided by the present invention has a 10-layer structure, the thickness reaches 3.0 mm, and the thicker the thickness, the poorer the applicability; the dust filter bag provided in Comparative Example 2 has a longitudinal breaking strength of 1200 N / 10cm and a transverse breaking strength of 900N / 10cm; the mass per unit area is 1300 (g / m 2 ); The high-temperature dust removal bag woven filter bag provided in this comparative example was tested. Combustible materials such as wood, plastic, and chemical fiber were collected and supplemented with a small amount of alcohol to conduct a combustion experiment in the prepared combustion chamber. An airflow of 100pa was used to assist the flue gas to pass through the test instrument. The flue gas generated by the combustion was tested using a portable smoke tester in accordance with the "Emission Standards for Air Pollutants in Coking Chemical Industry" (GB 16171.1-2024). The flue gas temperature generated during combustion was 607°C and the smoke concentration was 1372g / m 3After dust removal by filter bags, the smoke concentration was tested to be 245 mg / m³.

[0021] Compared with the high-temperature dust bag woven filter bag provided in Example 2, the mechanical properties are insufficient, it is thicker and heavier and not convenient to install; in a high-temperature airflow environment of 600°C and 100pa pressure, the dust removal and filtration performance is reduced to about 82% of the high-temperature dust bag woven filter bag provided by the present invention, the stable use time is 1 month, and the service life and reliability are low.

[0022]

Claims

1. A method for preparing a high-temperature dust removal bag, characterized in that: Here are the steps: S1: Preparation of composite filament yarn: Inorganic fiber yarn (3) and heat-resistant alloy wire (4) are paralleled and twisted to obtain composite filament yarn, and the obtained yarn is yarn A; S2: Preparation of filament staple fiber composite yarn: Wrapping the inorganic staple fiber (2) onto the surface of yarn A to obtain filament staple fiber composite yarn, and the obtained yarn is yarn B; S3: Preparation of a composite braid: The yarn B, the inorganic fiber yarn (3), and the high-silica glass fiber filament yarn are braided together in an interlayer angle interlocking structure to form a composite braid; S4: Preparation of dust removal bag: cutting and splicing the composite woven body and coating the surface with PTFE film to form a high-temperature dust removal bag.

2. The method for preparing a high-temperature dust removal bag according to claim 1, characterized in that: The heat-resistant alloy wire (4) is a nickel alloy wire or a stainless steel alloy wire, has a diameter of 0.1-0.5 mm, and a thermal decomposition temperature of 1200-1500° C.

3. The method for preparing a high-temperature dust removal bag according to claim 2, characterized in that: The inorganic fiber yarn (3) is selected from one or more of glass fiber, quartz fiber, carbon fiber, silicon carbide fiber, basalt fiber, alumina fiber, high-silica glass fiber, and silicate fiber, and has a linear density of 60-240 tex.

4. The method for preparing a high-temperature dust removal bag according to claim 3, characterized in that: In step S1, the number of inorganic fiber yarns (3) during the parallel twisting process is 1 to 5; the number of heat-resistant alloy wires (4) is 1 to 5; the pulling speed during the parallel twisting process is 10 to 50 m / min, and the twisting twist is 100 to 500 T / M.

5. The method for preparing a high-temperature dust removal bag according to claim 4, characterized in that: In step S2, spinning is performed by one of the methods of friction spinning, air spinning, ring spinning, and rotor spinning, so that the inorganic short fibers (2) are evenly wrapped around the surface of the yarn A.

6. The method for preparing a high-temperature dust removal bag according to claim 5, characterized in that: The inorganic short fibers (2) are selected from one or more of glass fibers, quartz fibers, carbon fibers, silicon carbide fibers, basalt fibers, alumina fibers, high-silica glass fibers, and silicate fibers.

7. High temperature dust removal bag, characterized in that: The high-temperature dust removal bag is prepared by the preparation method of any one of claims 1 to 6.

8. The high temperature dust removal bag according to claim 7, characterized in that: It includes at least: A high temperature heat insulation and impact resistance layer (11), which is entirely composed of yarn B; A heat-insulating reinforcement connecting layer (12), which is composed of inorganic fiber yarn 3 and yarn B; The high-temperature dust removal filter layer (13) is composed of high-silica glass fiber yarn and the entire surface of the layer is covered with a PTFE film.

9. The dust removal bag according to claim 8, characterized in that: It is cylindrical.

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