A high temperature resistant dust removal filter bag

Abstract

The present invention provides a high-temperature resistant dust filter bag, comprising an inner supporting structure, metal fiber cotton, and a protective net, wherein the metal fiber cotton wraps the inner supporting structure, and the protective net wraps the metal fiber cotton; the metal fiber cotton is made of a plurality of metal fiber wires, and dense pores are formed between the plurality of metal fiber wires, and the metal fiber cotton is tightly wrapped by the protective net to form a thin layer with a thickness of 0.2-3 mm; the diameter of some metal fiber wires of the metal fiber cotton is between 2-12 um; the weight of the metal fiber cotton per square meter is between 0.4-1.5 kg; the present invention adopts low-cost metal fiber cotton to make a high-temperature dust filter bag while meeting the PM2.5 emission standard, and can adopt a pulse backblowing method to clean the high-temperature dust filter bag, so that the high-temperature dust filter bag can be continuously used.

Description

Technical Field

[0001] The invention relates to a high temperature resistant dust removal filter bag. Background Art

[0002] Dust filter bags are a kind of efficient dust removal device. Dust filter bags are made of fiber porous filter materials, which have good air permeability and high dust collection rate. Dust filter bags made of metal fiber filter materials such as stainless steel are resistant to high temperatures. When using metal fiber filter materials to make dust filter bags, the metal fibers can be sintered and pressed into filter materials with a certain thickness, or the soft and elastic metal fibers can be tightly wrapped with an outer protective net to form filter materials with a certain thickness. Since the sintering process is a high-energy and high-cost process, high-temperature dust filter bags using metal fiber cotton have the advantage of lower cost than high-temperature dust filter bags using metal fiber sintered filter materials.

[0003] When high-temperature dust filter bags are used for filtration, solid particles in the dust-laden airflow are deposited on the surface of the filter bags and the fiber pores, and form an increasingly thick dust layer. Naturally, the filtration resistance gradually increases. When the filtration resistance increases to a certain extent, the filter bags must be cleaned. Pulse back-blowing is generally used to clean the filter bags, causing the filter bags to expand and vibrate instantly and impact, causing the filter bags to deform back and forth in a short period of time, and the dust layer accumulated on them is blown out and falls off, so that the high-temperature dust filter bags can be used continuously. At present, when making dust filter bags that can meet PM2.5 emission standards, the cost of sintering metal fibers is high, and high-temperature dust filter bags made of metal fiber cotton cannot be cleaned by pulse back-blowing when meeting PM2.5 emission requirements, resulting in short service life of the filter bags and the need for frequent replacement, and the cost cannot be reduced. Summary of the invention

[0004] The purpose of the present invention is to develop a reasonable and effective fiber cotton formula and structure, so as to provide a high-efficiency dust removal filter bag that can clean the filter bag by pulse backblowing while meeting the PM2.5 emission standards.

[0005] The present invention adopts the following technical solutions:

[0006] A high-temperature resistant dust filter bag comprises an inner supporting structure, metal fiber cotton, and a protective net, wherein the metal fiber cotton wraps the inner supporting structure, and the protective net wraps the metal fiber cotton; the metal fiber cotton is made of a plurality of metal fiber filaments, and a plurality of the metal fiber filaments form dense gaps, and the metal fiber cotton is tightly wrapped by the protective net to form a thin layer with a thickness of 0.2-3mm; the diameter of some metal fiber filaments of the metal fiber cotton is between 2-12um; the weight of the metal fiber cotton per square meter is between 0.4-1.5kg; the technical features described in the present invention can achieve: while meeting the PM2.5 emission standards, the filter bag can be cleaned by pulse backblowing.

[0007] Preferably, the metal fiber filaments are made by a bundle drawing method and have a diameter between 2 and 30 um.

[0008] Preferably, part of the metal fiber filaments of the metal fiber cotton are made by turning, have a diameter between 15-35 um, a triangular or crescent-shaped cross section, and cutting marks on the fiber surface.

[0009] Preferably, the metal fiber wire is made of stainless steel, iron-chromium-aluminum, or nickel-chromium alloy.

[0010] Preferably, the metal fiber cotton is tightly wrapped by the protective net to form a thin layer with a thickness of 0.5-1.5 mm.

[0011] Preferably, the diameter of some metal fiber filaments of the metal fiber cotton is between 4-8 um.

[0012] Preferably, the weight of the metal fiber wool is between 0.5-1.2 kg per square meter.

[0013] Preferably, the metal fiber cotton has a multi-layer structure, each layer is made of metal fiber filaments with different diameters, and is divided into a coarse fiber layer and a fine fiber layer according to the diameter of the metal fiber filaments.

[0014] Preferably, the fine fiber layer is located outside the coarse fiber layer.

[0015] Preferably, the fine fiber layer is located in the middle layer, the outer layer is provided with a first coarse fiber layer, and the inner layer is provided with a second coarse fiber layer.

[0016] Preferably, the weight of the fine fiber layer is 0.3-0.5 kg per square meter.

[0017] Preferably, the diameter of the metal fiber filaments of the fine fiber layer is between 5.5-6.5 um; the weight of the fine fiber layer is 0.35-0.45 kg per square meter; and the thickness of the fine fiber layer is 0.1-0.5 mm.

[0018] Preferably, the diameter of the metal fiber filaments in the fine fiber layer is between 4 and 7 um; the diameter of the metal fiber filaments in the coarse fiber layer is between 18 and 25 um.

[0019] The beneficial effects of the present invention are as follows: the metal fiber wool of the present invention does not need to be sintered, which greatly reduces the production cost, and at the same time, by controlling the thickness of the metal fiber wool, the diameter of the metal fiber filaments in the metal fiber wool, and the weight of the coarse and fine fiber layers in the fiber cotton, the metal fiber filaments are densely distributed with appropriate pores (the researchers of the present invention found that if the metal fiber filaments are too thick and the pores formed between them are too large, or the metal fiber cotton is too thin, the filtering effect will not meet the requirements of PM2.5 filtration; if the metal fiber filaments are too thin and the pores formed between them are too small, and the metal fiber cotton is too thick, it is not easy for the pulse backblowing gas to blow off the dust, causing blockage and affecting the sustainable operation of the filtration). These pores enable the present invention to clean the filter bag by pulse backblowing while meeting the PM2.5 emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the present invention.

[0021] Figure 2 is a schematic diagram of a second embodiment of the present invention.

[0022] Figure 3 It is a schematic diagram of the coarse fiber layer of the present invention.

[0023] Figure 4 Schematic diagram of the fine fiber layer of the present invention.

[0024] Figure 5 is a schematic diagram of a third embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose and technical solution of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Example:

[0027] like Figure 1 to Figure 5A high-temperature resistant dust filter bag shown includes an inner support structure 1, metal fiber cotton 2, and a protective net 3, wherein the metal fiber cotton 2 wraps the inner support structure 1, and the protective net 3 wraps the metal fiber cotton 2; the metal fiber cotton 2 is made of a plurality of metal fiber wires, including but not limited to weaving, the metal fiber wires inside the metal fiber cotton 2 are randomly distributed, and there is no welding, sintering, or bonding between the fibers, and only mechanical contact; dense pores are formed between the plurality of metal fiber wires, and the metal fiber cotton is tightly wrapped by the protective net to form a thin layer with a thickness of 0.2-3mm; the diameter of some metal fiber wires of the metal fiber cotton is between 2-12um; the weight of the metal fiber cotton per square meter is between 0.4-1.5kg; while meeting the PM2.5 emission standard, the present invention can also use a pulse backblowing method to clean the filter bag.

[0028] Preferably, the metal fiber filaments are made by a bundle drawing method and have a diameter between 2-30 um. The bundle drawing method can be used to draw multiple metal fiber filaments with small diameters at one time without easily breaking, thereby reducing processing difficulty and processing costs.

[0029] Preferably, part of the metal fiber filaments of the metal fiber cotton 2 are made by turning, have a diameter between 15-35 um, a triangular or crescent-shaped cross section, and cutting marks on the fiber surface.

[0030] Preferably, the metal fiber wire is made of stainless steel, iron-chromium-aluminum, or nickel-chromium alloy.

[0031] Preferably, the metal fiber cotton 2 is tightly wrapped by the protective net to form a thin layer with a thickness of 0.5-1.5 mm.

[0032] Preferably, the diameter of some metal fiber filaments of the metal fiber cotton 2 is between 4-8 um.

[0033] Preferably, the weight of the metal fiber wool 2 is between 0.5-1.2 kg per square meter.

[0034] Embodiment 2:

[0035] like Figure 2 As shown, it includes an inner supporting structure 1, metal fiber cotton 2, and a protective net 3, wherein the metal fiber cotton 2 wraps the inner supporting structure 1, and the protective net 3 wraps the metal fiber cotton 2; the metal fiber cotton 2 has a multi-layer structure, each layer is made of metal fiber wires of different diameters, and is divided into a coarse fiber layer 21 and a fine fiber layer 22 according to the diameter of the metal fiber wire; the coarse fiber layer 21 and the fine fiber layer 22 are divided not only to filter dust of different sizes, but also in that the pores of the metal fiber wires are staggered between each layer, thereby enhancing the interception effect of dust particles entering therein and improving the filtering effect.

[0036] Preferably, the fine fiber layer 22 is located on the outer layer of the coarse fiber layer 21 .

[0037] Embodiment 3

[0038] like Figure 5 As shown, it includes an inner supporting structure 1, metal fiber cotton 2, and a protective net 3, wherein the metal fiber cotton 2 wraps the inner supporting structure 1, and the protective net 3 wraps the metal fiber cotton 2; the metal fiber cotton 2 has a multi-layer structure, each layer is made of metal fiber wires of different diameters, and is divided into a fine fiber layer 22, a first coarse fiber layer 211, and a second coarse fiber layer 212 according to the diameter of the metal fiber wire; the fine fiber layer 22 is located in the middle layer, the fine fiber layer is located in the middle layer, the outer layer is provided with a first coarse fiber layer 211, and the inner layer is provided with a second coarse fiber layer 212.

[0039] Preferably, the weight of the fine fiber layer is 0.3-0.5 kg per square meter.

[0040] Preferably, the diameter of the metal fiber filaments of the fine fiber layer is between 5.5-6.5 um; the weight of the fine fiber layer is 0.35-0.45 kg per square meter; and the thickness of the fine fiber layer is 0.1-0.5 mm.

[0041] Preferably, the diameter of the metal fiber filaments in the fine fiber layer is between 4 and 7 um; the diameter of the metal fiber filaments in the coarse fiber layer is between 18 and 25 um.

[0042] The beneficial effects of the present invention are as follows: the metal fiber wool of the present invention does not need to be sintered, which greatly reduces the production cost, and at the same time, by controlling the thickness of the metal fiber wool, the diameter of the metal fiber filaments in the metal fiber wool, and the weight of the coarse and fine fiber layers in the fiber cotton, the metal fiber filaments are densely distributed with appropriate pores (the researchers of the present invention found that if the metal fiber filaments are too thick and the pores formed between them are too large, or the metal fiber cotton is too thin, the filtering effect will not meet the requirements of PM2.5 filtration; if the metal fiber filaments are too thin and the pores formed between them are too small, and the metal fiber cotton is too thick, it is not easy for the pulse backblowing gas to blow off the dust, causing blockage and affecting the sustainable operation of the filtration). These pores enable the present invention to clean the filter bag by pulse backblowing while meeting the PM2.5 emission standards.

[0043] The embodiments described above are merely preferred embodiments of the present invention and do not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A high temperature resistant dust filter bag, comprising an inner support structure, metal fiber cotton, and a protective net, wherein the metal fiber cotton wraps the inner support structure, and the protective net wraps the metal fiber cotton; the metal fiber cotton is made of a plurality of metal fiber wires, and dense pores are formed between the plurality of metal fiber wires, characterized in that: The metal fiber cotton is tightly wrapped by the protective net to form a thin layer with a thickness of 0.2-3 mm; The diameter of some metal fiber filaments of the metal fiber cotton is between 2-12 μm; Some of the metal fiber filaments of the metal fiber cotton are made by turning, have a diameter between 15 and 35 μm, a triangular or crescent-shaped cross section, and cutting marks on the fiber surface; The weight of the metal fiber cotton per square meter is between 0.4-1.5 kg; The metal fiber cotton has a multi-layer structure, each layer is made of metal fiber wires of different diameters, and is divided into a coarse fiber layer and a fine fiber layer according to the diameter of the metal fiber wires; The weight of the fine fiber layer is 0.3-0.5 kg per square meter; The thickness of the fine fiber layer is 0.1-0.5 mm; The diameter of the metal fiber filaments in the fine fiber layer is between 4 and 7 μm; The diameter of the metal fiber wires in the coarse fiber layer is between 18 and 25 μm.

2. A high temperature resistant dust removal filter bag according to claim 1, characterized in that: The material of the metal fiber wire is stainless steel, iron-chromium-aluminum, or nickel-chromium alloy.

3. The high temperature resistant dust removal filter bag according to claim 1, characterized in that: The metal fiber cotton is tightly wrapped by the protective net to form a thin layer with a thickness of 0.5-1.5 mm.

4. The high temperature resistant dust removal filter bag according to claim 1, characterized in that: The diameter of a part of the metal fiber filaments of the metal fiber wool is between 4 and 8 μm.

5. The high temperature resistant dust removal filter bag according to claim 1, characterized in that: The weight of the metal fiber cotton is between 0.5-1.2 kg per square meter.

6. The high temperature resistant dust removal filter bag according to claim 1, characterized in that: The fine fiber layer is located on the outer layer of the coarse fiber layer.

7. The high temperature resistant dust removal filter bag according to claim 1, characterized in that: The fine fiber layer is located in the middle layer, the outer layer is provided with a first coarse fiber layer, and the inner layer is provided with a second coarse fiber layer.

8. The high temperature resistant dust removal filter bag according to claim 1, characterized in that: The diameter of the metal fiber filaments in the fine fiber layer is between 5.5 and 6.5 μm; The weight of the fine fiber layer is 0.35-0.45 kg per square meter.

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