High temperature dust removal bag and preparation method

Abstract

The present application discloses a high-temperature dust removal bag and a preparation method, which belongs to the field of dust removal bags. The steps of the high-temperature dust removal bag preparation method are as follows: S1: Preparation of composite filament yarn: Inorganic fiber yarn and heat-resistant alloy wire are paralleled and twisted to obtain composite filament yarn, and the obtained yarn is yarn A; S2: Preparation of filament staple composite yarn: Inorganic staple fibers are wrapped onto the surface of yarn A to obtain filament staple composite yarn, and the obtained yarn is yarn B; S3: Preparation of composite braid: Yarn B, inorganic fiber yarn, and high-silica glass fiber filament yarn are compositely braided with an interlayer angle interlocking structure to form a composite braid; S4: Preparation of dust removal bag: The composite braid is cut and spliced ​​and covered with a PTFE film on the surface to form a 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. By effectively filtering and collecting dust particles from the air, they reduce pollutant emissions, protect the environment, improve working conditions for workers, and ensure the health and safety of industrial production processes. In heavily polluting industries such as cement, steel, and chemicals, dust bags are particularly effective in reducing the spread of harmful substances, complying with environmental standards, and enhancing corporate social responsibility and regulatory compliance. Furthermore, dust bags optimize air circulation, improve equipment efficiency, and reduce energy consumption. Therefore, dust bags are not only a key component in environmental protection but also an integral part of production systems.

[0003] Chinese patent CN221535981U discloses a high-efficiency dust bag, and Chinese patent CN117582744A discloses an ultra-low emission flue gas dust bag with a gradient hierarchical structure emulsion coating. However, most current dust bags are designed for use in exhaust gas dust removal environments below 250°C. In high-temperature environments of 500-600°C, the dust bags in traditional dust collectors may not be able to withstand these temperatures for long periods, causing the bags to deform, burn, or crack, compromising dust removal effectiveness and equipment safety. Furthermore, the corrosion resistance of current dust bags needs improvement. High temperatures can intensify acid and alkali corrosion, further reducing their performance.

[0004] Using inorganic fibers, ceramic fibers, and other materials to manufacture dust collector bags not only prevents acid and alkali corrosion but also allows for use in high-temperature flue gas environments. Chinese patent CN219772430U discloses a bending device for producing glass fiber dust collector bags, Chinese patent CN1614116A discloses a method for sewing glass fiber dust collector bags, and Chinese patent CN101380818A discloses a method for making polyphenylene sulfide fiber dust collector bags. While high-temperature, corrosion-resistant dust collector bags are currently widely used in China, they still lack a lifespan of 2-3 months and are suitable for direct use in high-temperature flue gas environments at temperatures of 500-600°C. Summary of the Invention

[0005] The manufacturing method of the present invention is specifically used to manufacture the dust removal bag, and the manufacturing method is as follows; it includes the following steps:

[0006] S1 Preparation of high temperature resistant composite filament yarn;

[0007] Preparation of S2 high temperature resistant filament staple fiber composite yarn;

[0008] Preparation of S3 composite braid;

[0009] S4. The woven body is cut and spliced ​​to form a dust bag;

[0010] 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;

[0011] Furthermore, the heat-resistant alloy wire is a nickel alloy wire or a stainless steel alloy wire, having a diameter of 0.1 to 0.5 mm and a thermal decomposition temperature of 1500°C or above;

[0012] 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;

[0013] 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 in S1 is recorded as yarn A;

[0014] The step S2 is spinning the yarn A and the inorganic staple fiber 2, friction spinning, air spinning, ring spinning, rotor spinning, one of the methods, so that the inorganic staple fiber 2 is evenly wrapped to the surface of the yarn A to obtain yarn B;

[0015] Furthermore, if friction spinning is selected, the friction spinning machine parameters are set as follows during the friction spinning process: 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;

[0016] 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;

[0017] 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 woven into a fabric with an interlayer angle interlocking structure;

[0018] Further, the warp yarn Ⅰ and warp yarn Ⅱ selection of yarn B, warp yarn Ⅶ and warp yarn Ⅷ selection of high silica glass fiber filament yarn, warp yarn Ⅲ ~ VI selection of yarn B, high silica glass fiber filament yarn, inorganic fiber yarn 3 one or more thereof;

[0019] Furthermore, the weft yarns used in the multi-layer composite braided body are numbered ① to 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;

[0020] Furthermore, the composite braided body is divided into a multi-layer structure 11, 12, and 13 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, and the bottom high-temperature dust removal filter layer is composed of high-silica glass fiber yarn. The bottom surface of the bottom layer has a coating layer 5 of PTFE film. The total number of layers of the composite braided body is 3 to 15.

[0021] 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 location;

[0022] Furthermore, inorganic glue is used to bond the braided bodies at overlapping portions of the braided bodies, wherein the inorganic glue is one or more of sodium silicate glue, calcium silicate glue, aluminum silicate glue, and aluminum silicate glue;

[0023] The high-temperature dust removal bag provided by the present invention has the characteristics of being resistant to bending and having a long service life of 3-6 months, having a good dust removal effect, and being directly used for dust removal at a high temperature of 600 degrees;

[0024] Yarn A is formed by twisting heat-resistant alloy wire and inorganic fiber yarn 3 in parallel and forming the core yarn of yarn B. This enhances the tensile strength and bending resistance of yarn B at both room and high temperatures. Inorganic short fibers 2 are coated on the surface of yarn A, enhancing the high-temperature thermal insulation performance of yarn B. Combined with the selected material properties, the top layer 11 of the composite braid formed by yarn B has better high-temperature resistance, thermal insulation, erosion resistance, and bending resistance, making it suitable for corrosion-resistant high-temperature dust collector bags.

[0025] 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, which allows the three braided layers to be tightly combined. At the same time, the addition of yarn B also gives the second layer a certain degree of thermal insulation and adds a certain degree of toughness, further enhancing the braid's high temperature resistance, thermal insulation, erosion resistance, and bending resistance. The braided body can be used stably for 3-6 months under high temperature of 600°C and high temperature airflow with a pressure of -100Pa to 100Pa.

[0026] 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 inorganic fiber yarn 3, the high-silica glass fiber yarn has better tensile strength and toughness, lower production cost, and better processing performance. It can also work stably at high temperatures, and cooperates with the PTFE film covered on the surface to achieve high-temperature flue gas filtration performance of the braided body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of yarn A;

[0028] Figure 2 is a schematic diagram of yarn B;

[0029] Figure 3 and Figure 4 It is a schematic diagram of the structure of the composite braid;

[0030] Figure 5 This is a schematic diagram of high-temperature dust bag equipment;

[0031] 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

[0032] The present invention is described in detail below with reference to the accompanying drawings.

[0033] Example 1:

[0034] The manufacturing method of the present invention is specifically used to manufacture the dust removal bag, and the manufacturing method is as follows; it includes the following steps:

[0035] S1 Preparation of high temperature resistant composite filament yarn;

[0036] Preparation of S2 high temperature resistant filament staple fiber composite yarn;

[0037] Preparation of S3 composite braid;

[0038] S4. The woven body is cut and spliced ​​to form a dust bag;

[0039] The step S1 includes: paralleling and 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 0.2 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 paralleling and twisting process is 2; the number of heat-resistant alloy wires is 2; the pulling speed during the paralleling and twisting process is 35 m / min, and the twisting twist is 200 T / M; the resulting yarn is recorded as yarn A.

[0040] The step S2 is spinning the yarn A and the inorganic staple fibers 2 by a friction spinning machine, so that the inorganic staple fibers 2 are evenly wrapped around the surface of the yarn A to obtain yarn B;

[0041] Furthermore, during the friction spinning process, the friction spinning machine parameters were set as follows: feeding speed was 0.45 m / min, combing roller speed was 3500 r / min, friction roller speed was 3500 r / min, output speed was 5.00 m / min, and winding speed was 5.00 m / min; inorganic short fiber 2 was alumina fiber; the linear density of alumina fiber was 60 tex, and the length was 3-10 mm;

[0042] The preparation of the composite braid in step S3 is as follows: Figure 3 As shown, the above-mentioned yarn B, inorganic fiber yarn 3, high silica glass fiber filament yarn three kinds of yarn are woven to form a composite 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 braid 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;

[0043] The composite braided body is divided into 11, 12, 13 multi-layer structures with different functions, and the lower surface of the bottom layer has a coating layer 5 which is a PTFE film;

[0044] 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 using inorganic glue, and the inorganic glue is aluminum silicate glue.

[0045] The filter bag provided by the present invention was compared with a common high-temperature resistant dust removal filter bag on the market;

[0046] Comparison filter bag 1: FMS filter bag, with high tensile strength, high temperature resistance, and acid and alkali corrosion resistance, is made of a blend of polyimide (P84), polyphenylene sulfide (PPS), PTFE fiber, and alkali-free glass fiber; continuous use temperature: 180-220°C (strong acid resistant type) or ≤300°C (strong high temperature resistant type) with stable use for 2 weeks; transient temperature: 240°C (standard type) or 400°C (high temperature type); 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.

[0047] Comparison filter bag 2: PPS (polyphenylene sulfide) filter bag, chemical corrosion resistance (especially resistance to sulfur oxides); continuous use temperature: ≤170°C, stable use for 1 month, maximum instantaneous temperature 190~200°C; weight: 500~550 g / m²; mechanical properties: warp tension 500N / 10 cm, weft tension 600 N / 10 cm; thickness: 1.8 mm.

[0048] Comparison filter bag 3: PPS+PTFE composite filter bag, PPS fiber and PTFE fiber mixed (usually in a 50%:50% ratio); continuous use temperature: ≤190°C, 1 month of use, maximum instantaneous temperature 220°C; weight: ≥600 g / m²; warp breaking strength >800 N / 5cm, weft breaking strength >1100 N / 5cm; thickness: 2.5 mm.

[0049] Comparison filter bag 4: P84 (polyimide) filter bag, continuous use temperature: ≤260°C, 1 month of use, maximum instantaneous temperature 280°C; weight: 550 g / m²; longitudinal breaking strength 1200 N / 10cm, transverse breaking strength 700 N / 10cm; thickness: 2.0-2.5 mm.

[0050] 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 100 Pa 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 with reference to the "Emission Standard of Air Pollutants from the Coking Chemical Industry" (GB 16171.1-2024). The flue gas temperature generated during combustion was 597°C and the smoke concentration was 1390 g / m 3 After dust removal by filter bags, the smoke concentration was tested to be 21 mg / m³, which meets the emission standards.

[0051] The high-temperature dust bag woven filter bag provided by the present invention can be used stably for 4 months under high-temperature airflow of 600°C and 100Pa pressure, and can be used stably for 6 months under high-temperature airflow of 500°C and 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, 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 better performance at the same quality or thickness.

[0052] Example 2:

[0053] The manufacturing method of the present invention is specifically used to manufacture the dust removal bag, and the manufacturing method is as follows; it includes the following steps:

[0054] S1 Preparation of high temperature resistant composite filament yarn;

[0055] Preparation of S2 high temperature resistant filament staple fiber composite yarn;

[0056] Preparation of S3 composite braid;

[0057] S4. The woven body is cut and spliced ​​to form a dust bag;

[0058] 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 having a diameter of 0.1 mm and a thermal decomposition temperature of 800°C; the inorganic fiber yarn 3 is made of glass fiber having a linear density of 100 tex;

[0059] 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 in S1 is recorded as yarn A;

[0060] The step S2 is spinning the yarn A and the inorganic staple fibers 2 by a friction spinning machine, so that the inorganic staple fibers 2 are evenly wrapped around the surface of the yarn A to obtain yarn B;

[0061] Furthermore, during the friction spinning process, the friction spinning machine parameters were set as follows: feeding speed was 0.3 m / min, carding roller speed was 3000 r / min, friction roller speed was 3000 r / min, output speed was 5.00 m / min, and winding speed was 5.00 m / min; inorganic short fiber 2 was alumina fiber;

[0062] The preparation of the composite braid in step S3 is as follows: Figure 4;; The above-mentioned yarn B, inorganic fiber yarn 3, three kinds of yarns are compositely woven to form a fabric with an interlayer angle interlocking structure; 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 yarns III~VI are respectively selected from yarn B, inorganic fiber yarn 3, high silica glass fiber filament yarn, high silica glass fiber filament yarn; the weft yarns used in the multi-layer composite braid 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;

[0063] The composite braided body is divided into 11, 12, 13 multi-layer structures with different functions, and the bottom surface of the bottom layer has a coating layer 5 which is a PTFE film;

[0064] 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 using inorganic glue, and the inorganic glue is aluminum silicate glue.

[0065] 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. The flue gas generated by the combustion was tested using a portable smoke tester with reference to the "Emission Standard of 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.

[0066] Comparative Example 1:

[0067] 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 dust removal bag.

[0068] The high-temperature dust bag woven filter bag provided in the above steps was tested when the thickness of the high-temperature dust bag woven filter bag provided in Example 2 was the same as 2.0 mm. 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 100 Pa was used to assist the flue gas to pass through the testing instrument. The flue gas generated by the combustion was tested using a portable smoke tester with reference to the "Emission Standard of Air Pollutants for Coking Chemical Industry" (GB 16171.1-2024). The flue gas temperature generated during combustion was 583°C and the smoke concentration was 1331 g / m 3 After dust removal by filter bags, the smoke concentration was tested to be 612 mg / m³;

[0069] Under a high temperature of 600°C and a high pressure of 100 Pa, the dust removal and filtration performance is only about 47% of the high temperature dust removal woven filter bag provided by the present invention, which is far from meeting the requirements for the use of filter bags.

[0070] 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;

[0071] 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 terms of the structure of the woven body. The comparative example 2 is a single multi-layer adhesive 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 the same 10-layer structure, the thickness reaches 3.0 mm, which is thicker and has poorer applicability. The dust filter bag provided in the comparative example 2 has a longitudinal breaking strength of 1200 N / 10 cm and a transverse breaking strength of 900 N / 10 cm; the mass per unit area is 1300 (g / m 2 );

[0072] The high-temperature dust 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 a prepared combustion chamber. An airflow of 100 Pa 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 with reference to the "Emission Standard of Air Pollutants from the Coking Chemical Industry" (GB 16171.1-2024). The flue gas temperature generated during combustion was 607°C and the smoke concentration was 1372g / m 3 After dust removal by filter bags, the smoke concentration was tested to be 245 mg / m³.

[0073] 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 inconvenient 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, and the stable use time is 1 month, and the service life and reliability are low.

[0074]

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 composite yarn: Inorganic staple fibers (2) are wrapped onto the surface of yarn A to obtain filament staple composite yarn, and the obtained yarn is yarn B; S3: Preparation of 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 covering the surface with a PTFE film to form a high-temperature dust removal bag; The heat-resistant alloy wire (4) is a nickel alloy wire with a diameter of 0.1-0.5 mm and a thermal decomposition temperature of 1200-1500° C. 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.

2. The method for preparing a high-temperature dust removal bag according to claim 1, 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.

3. The method for preparing a high-temperature dust removal bag according to claim 2, 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.

4. The method for preparing a high-temperature dust removal bag according to claim 3, characterized in that: The inorganic short fiber (2) 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.

5. High temperature dust bag, characterized in that: The high-temperature dust removal bag is prepared by the preparation method of any one of claims 1 to 4.

6. The high-temperature dust removal bag according to claim 5, characterized in that: It includes at least: A high-temperature heat-insulating and impact-resistant 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.

7. The dust removal bag according to claim 6, characterized in that: It is cylindrical.

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