CN114307436A - Long-period efficient filtering metal filter bag and manufacturing method thereof - Google Patents
Long-period efficient filtering metal filter bag and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a long-period efficient filtering metal filter bag and a manufacturing method thereof, and belongs to the technical field of industrial kiln high-temperature flue gas dust removal. The metal filter bag includes: the integrated felt cylinder is formed by butt welding a plurality of sections of unit metal fiber felt cylinders, and the air permeability of the plurality of sections of unit metal fiber felt cylinders is increased in sequence; the framework is embedded into the integrated felt barrel, and two end parts of the framework are respectively connected with the flange and the bottom cover in a welding mode. According to the invention, metal fibers with different wire diameters are paved to obtain metal fiber felts with the same precision and different air permeabilities, then butt welding and forming are carried out according to the sequence of increasing the air permeabilities in sequence, so that a metal fiber integrated felt tube is obtained, and the metal filter bag is manufactured, so that the problem of unbalanced filtration caused by poor local ash removal performance of the existing metal filter bag is solved, and the purpose of long-period efficient filtration of a metal filter bag dust removal system is finally realized.
Description
Technical Field
The invention belongs to the technical field of industrial kiln high-temperature flue gas dust removal, and particularly relates to a long-period efficient filtering metal filter bag and a manufacturing method thereof.
Background
With the continuous development and development of the industry, the environmental pollution problem possibly caused in the industrial manufacturing process arouses high importance of the society, and the environmental protection departments set the pollutant discharge standards of various industries in succession. Wherein, the emission of the particulate matters is required to be 10mg/m3The following, some places and even enterprises require 5mg/m3In the following, ultra-low particulate emissions will be a challenge, which requires that the filtration system must achieve high efficiency filtration. At present, the high-temperature dust removal technology for the flue gas of the industrial kiln is mainly applied to the fields of steel converters, cement rotary kilns, alumina roasting furnaces, glass kilns and the like.
Compared with the traditional cloth bag, the metal filter bag has more outstanding temperature resistance, the highest temperature resistance can reach 800 ℃, and the metal filter bag is more suitable for high-temperature flue gas dust removal of industrial kilns. With the increase of the demand of various industries on high-temperature dust removal metal filter bags, the conventional metal filter bags cannot meet the requirements of customers of some industries. At present, the length of a metal filter bag is 7.5m in practical engineering, compressed gas is sprayed into the filter bag along a filter bag opening at a high speed in a pulse spraying dust removal process, a large amount of compressed gas is gradually lost along the side wall of the filter bag, only a small amount of compressed gas reaches the bottom of the filter bag, and therefore the dust removal effects of the upper part and the lower part of the filter bag are greatly different, so that the difference between the upper part and the lower part of the filter bag is gradually opened, finally, the filter bag is unbalanced in filtering, the efficiency is low, and the service cycle of the filter bag is shortened.
Therefore, a long-period efficient filtering metal filter bag is developed, the problem of unbalanced filtering caused by poor local ash removal performance of the existing metal filter bag is solved, and long-period efficient filtering of a high-temperature flue gas dust removal system of an industrial kiln is realized.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a long-period efficient filtering metal filter bag and a manufacturing method thereof, which can realize long-period efficient filtering of the metal filter bag in the field of high-temperature flue gas dust removal of industrial kilns.
The invention is realized by the following technical scheme:
in a first aspect of the present invention, there is provided a long-cycle high-efficiency filtration metal filter bag, comprising:
the integrated felt cylinder is formed by butt welding a plurality of sections of unit metal fiber felt cylinders, and the air permeability of the plurality of sections of unit metal fiber felt cylinders is increased in sequence;
the framework is embedded into the integrated felt barrel, and two end parts of the framework are respectively connected with the flange and the bottom cover in a welding mode.
The invention is further improved in that:
the gas filtering precision of the multi-section unit metal fiber felt cylinder is the same.
The invention is further improved in that:
the gas filtration precision of the unit metal fiber felt cylinder is 0.5 mu m, 1.0 mu m or 2.0 mu m, and the air permeability is 54-195L/dm2Min range.
The invention is further improved in that:
the unit metal fiber felt cylinder comprises 4-6 sections, and the air permeability of the adjacent unit metal fiber felt cylinders is sequentially increased by 7% -15%.
The invention is further improved in that:
the end with small air permeability of the integrated felt cylinder is connected with the flange, and the end with large air permeability is connected with the bottom cover.
The second aspect of the invention provides a method for manufacturing a long-period efficient filtering metal filter bag, which specifically comprises the following steps:
designing and manufacturing a plurality of metal fiber felts with the same precision and different air permeabilities, and cutting the metal fiber felts into required specification and size;
secondly, processing the cut metal fiber felt into a round shape to obtain a plurality of sections of unit metal fiber felt cylinders;
thirdly, sequentially butt-welding a plurality of sections of unit metal fiber felt cylinders according to the sequence of increasing the air permeability to form an integrated felt cylinder;
and fourthly, embedding the framework into the integrated felt barrel, and respectively welding the end parts of the framework and the flange and the bottom cover to obtain the metal filter bag.
The invention is further improved in that:
in the first step, the metal fiber felt is formed by paving metal drawing fibers with the wire diameter of 2-22 mu m, and the metal fiber felt is made of stainless steel or temperature-resistant corrosion-resistant alloy;
preferably, the gas filtration precision of the metal fiber felt is 0.5 mu m, 1.0 mu m and 2.0 mu m, and the air permeability is 54-195L/dm2Min range.
The invention is further improved in that:
in the second step, the metal fiber felt is processed into a round shape with the diameter of
The invention is further improved in that:
and thirdly, the integrated felt cylinder is formed by butt welding 4-6 sections of unit metal fiber felt cylinders, and the air permeability of the connected unit metal fiber felt cylinders is sequentially increased by 7-15%.
The invention is further improved in that:
and in the fourth step, the end with small air permeability of the metal filter bag is connected with the flange, and the end with large air permeability is connected with the bottom cover.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a long-period efficient filtering metal filter bag and a manufacturing method thereof, which mainly adopts metal fibers with different wire diameters to spread metal fiber felts with the same precision and different air permeabilities, then butt welding and forming are carried out according to the sequence of increasing the air permeabilities in sequence to obtain a metal fiber integrated felt cylinder, and the metal filter bag is manufactured, so that the problem of unbalanced filtering caused by poor local ash removal performance of the existing metal filter bag is solved, and the purpose of long-period efficient filtering of a metal filter bag dust removal system is finally realized.
Drawings
FIG. 1 is a schematic structural diagram of a long-period high-efficiency filtering metal filter bag according to the present invention.
In the figure, 1, a unit metal fiber felt cylinder, 2, a flange, 3 and a bottom cover.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the invention provides a long-period efficient filtering metal filter bag, as shown in figure 1, comprising:
the integrated felt cylinder is formed by butt welding a plurality of sections of unit metal fiber felt cylinders 1, and the air permeability of the plurality of sections of unit metal fiber felt cylinders 1 is increased in sequence;
the framework is embedded into the integrated felt barrel, and two end parts of the framework are respectively connected with the flange 2 and the bottom cover 3 in a welding mode.
Further, the gas filtering precision of the multi-section unit metal fiber felt cylinder 1 is the same; preferably, the gas filtration precision of the unit metal fiber felt cylinder is 0.5 mu m, 1.0 mu m or 2.0 mu m, and the air permeability is 54-195L/dm2Min range.
Further, the unit metal fiber felt cylinder 1 comprises 4-6 sections, and the air permeability of the adjacent unit metal fiber felt cylinders 1 is sequentially increased by 7% -15%.
Furthermore, the end with small air permeability of the integrated felt cylinder is connected with the flange 2, and the end with large air permeability is connected with the bottom cover 3.
The invention also provides a manufacturing method of the long-period efficient filtering metal filter bag, which specifically comprises the following steps:
designing and manufacturing a plurality of metal fiber felts with the same precision and different air permeabilities, and cutting the metal fiber felts into required specification and size;
specifically, the metal fiber felt is formed by paving metal drawing fibers with the wire diameter of 2-22 mu m, and the metal fiber felt is made of stainless steel or a temperature-resistant corrosion-resistant alloy; preferably, the first and second electrodes are formed of a metal,the gas filtration precision of the metal fiber felt is 0.5 mu m, 1.0 mu m and 2.0 mu m, and the air permeability is 54-195L/dm2Min range;
secondly, processing the cut metal fiber felt into a round shape to obtain a plurality of sections of unit metal fiber felt cylinders 1;
with specific address, the diameter of the multi-section unit metal fiber felt cylinder 1 is
Thirdly, sequentially butt-welding a plurality of sections of unit metal fiber felt cylinders 1 according to the sequence of increasing the air permeability to form an integrated felt cylinder;
specifically, the unit metal fiber felt tube 1 is usually specified by
And
the length of a single section is less than or equal to 1205mm, and two sections of unit metal fiber felt cylinders 1 are butted by adopting resistance welding;
the integrated felt cylinder is generally formed by butt welding 4-6 sections of unit metal fiber felt cylinders 1, and the air permeability of the connected unit metal fiber felt cylinders 1 is sequentially increased by 7-15%;
and fourthly, embedding the framework into the integrated felt barrel, and respectively welding the end parts of the framework and the flange 2 and the bottom cover 3 to obtain the metal filter bag.
Specifically, the framework consists of 10-16 longitudinal ribs with the diameter of 3mm and transverse ribs with the diameter of 4mm and the interval of 150-200 mm, and the material is stainless steel;
the metal filter bag is formed by connecting the end with smaller air permeability of the integrated felt cylinder with the flange 2 and the end with larger air permeability with the bottom cover 3, so that the obtained metal filter bag is downward along the flange of the bag opening, and the air permeability of the metal filter bag is sequentially increased.
Compared with the prior art, the long-period efficient filtering metal filter bag and the manufacturing method thereof provided by the invention have the advantages that metal fibers with different wire diameters are mainly adopted to be paved into metal fiber felts with the same precision and different air permeabilities, then butt welding and forming are carried out according to the sequence of increasing the air permeabilities in sequence, a metal fiber integrated felt cylinder is obtained, the metal filter bag is manufactured, and the purpose of long-period efficient filtering of a metal filter bag dust removal system is finally realized.
The basis is as follows: in the pulse injection dust removal process of the metal filter bag, compressed gas is injected into the filter bag at a high speed along a filter bag opening until the bottom of the filter bag, and a large amount of compressed gas is lost through the side wall of the filter bag in the process, so that the amount of compressed gas at the bottom is too small, the pressure is insufficient, and the dust removal effect is poor. Therefore, the designed value of the air permeability of the upper part of the filter bag is reduced, and then the downward air permeability is sequentially increased, so that the loss of compressed gas along the side wall of the filter bag in the ash removal process is reduced, the ash removal difference of the upper part and the lower part of the filter bag is reduced to the maximum extent, the long-term balanced filtration of the metal filter bag is realized, and the long-period high-efficiency filtration performance of the metal filter bag is ensured.
Example 1
A manufacturing method of a long-period efficient filtering metal filter bag comprises the following specific implementation steps:
(1) the metal fiber felt with the gas filtration precision of 0.5 mu m is prepared by adopting metal fibers with different wire diameters, and the total 4 kinds of metal fiber felts with different air permeabilities are respectively as follows:
a. is paved by metal fibers with the thickness of 4 mu m and 6 mu m, and has the air permeability of 54.5L/dm2Min, denoted as A;
b. is prepared by spreading metal fibers of 2 microns, 8 microns and 12 microns and has air permeability of 62.3L/dm2Min, denoted as B;
c. is prepared by spreading metal fibers of 2 microns, 6 microns and 12 microns and has air permeability of 71.6L/dm2Min, denoted as C;
d. is prepared by spreading metal fibers of 2 microns, 4 microns and 12 microns and has air permeability of 78.6L/dm2Min, denoted as D;
the 4 fiber felts are cut into the length of 1205mm and the width of 414 mm;
(2) rolling the 4 kinds of cut metal fiber felt into the metal fiber felt with the diameter of
Then longitudinally seam welding to obtain the unit goldA fiber mat cartridge A, B, C, D;
(3) the unit metal fiber felt cylinders A, B, C, D are butt-welded in sequence to obtain a metal fiber integrated felt cylinder with air permeability distribution of 54.5L/dm in sequence2·min、62.3L/dm2·min、71.6L/dm2·min、78.6L/dm2·min；
(4) Embedding the framework into the integrated felt barrel, respectively welding the end parts with the flange and the bottom cover, connecting the end with smaller air permeability with the flange, and connecting the end with larger air permeability with the bottom cover to obtain the product
A metal filter bag.
(5) The experiment of the filtering and dust removing performance of the metal filter bag is carried out, the filtering wind speed is selected to be 1.2m/min, the standard dust Pural NF is adopted, and the experiment result is shown in the table 1.
Example 2
A manufacturing method of a long-period efficient filtering metal filter bag comprises the following specific implementation steps:
(1) the metal fiber felt with the gas filtration precision of 1.0 mu m is prepared by adopting metal fibers with different wire diameters, and the gas permeability is totally 5 different, which are respectively as follows:
a. is paved by metal fibers with the thickness of 8 mu m, 12 mu m and 22 mu m, and has air permeability of 81.8L/dm2Min, denoted as A;
b. is prepared by spreading metal fibers with the diameter of 8 mu m and 12 mu m, and has the air permeability of 95.3L/dm2Min, denoted as B;
c. is prepared by spreading metal fibers of 6 mu m and 22 mu m, and has air permeability of 108.7L/dm2Min, denoted as C;
d. is prepared by spreading metal fibers of 6 microns, 12 microns and 22 microns and has air permeability of 121.6L/dm2Min, denoted as D;
e. is prepared by spreading 6 μm, 8 μm and 22 μm metal fibers and has air permeability of 135.8L/dm2Min, denoted as E;
cutting the 5 kinds of fiber mats into 1155mm long and 507mm wide;
(2) rolling the cut 5 kinds of metal fiber felt into a roll with the diameter of
Then longitudinally seam welding to obtain a unit metal fiber felt cylinder A, B, C, D, E;
(3) the unit metal fiber felt cylinders A, B, C, D, E are butt-welded in sequence to obtain metal fiber integrated felt cylinders with air permeability distribution of 81.8L/dm in sequence2·min、95.3L/dm2·min、108.7L/dm2·min、121.6L/dm2·min、135.8L/dm2·min；
(4) Embedding the framework into the integrated felt barrel, respectively welding the end parts with the flange and the bottom cover, connecting the end with smaller air permeability with the flange, and connecting the end with larger air permeability with the bottom cover to obtain the product
A metal filter bag.
(5) The experiment of the filtering and dust removing performance of the metal filter bag is carried out, the filtering wind speed is selected to be 1.2m/min, the standard dust Pural NF is adopted, and the experiment result is shown in the table 2.
Example 3
A manufacturing method of a long-period efficient filtering metal filter bag comprises the following specific implementation steps:
(1) the metal fiber felt with the gas filtration precision of 1.5 mu m is prepared by adopting metal fibers with different wire diameters, and the total 6 kinds of metal fiber felts with different air permeabilities are as follows:
a. is paved by 12 mu m and 22 mu m metal fibers, and has air permeability of 118.7L/dm2Min, denoted as A;
b. is prepared by spreading metal fibers of 8 microns, 12 microns and 22 microns and has air permeability of 135.9L/dm2Min, denoted as B;
c. is prepared by spreading metal fibers with the diameter of 8 mu m and 12 mu m, and has the air permeability of 148.2L/dm2Min, denoted as C;
d. is prepared by spreading 6 mu m, 8 mu m and 22 mu m metal fibers and has air permeability of 165.8L/dm2Min, denoted as D;
e. is prepared by spreading metal fibers of 6 microns, 8 microns and 12 microns and has air permeability of 181.5L/dm2Min, denoted as E;
f. is prepared by spreading metal fibers of 6 mu m and 22 mu m, and has air permeability of 198.6L/dm2Min, denoted as F;
the 6 kinds of fiber felts are cut into 1150mm long and 507mm wide;
(2) rolling the cut 6 kinds of metal fiber felt into a roll with the diameter of
Then longitudinally seam welding to obtain a unit metal fiber felt cylinder A, B, C, D, E, F;
(3) the unit metal fiber felt cylinders A, B, C, D, E, F are butt-welded in sequence to obtain metal fiber integrated felt cylinders with air permeability distribution of 118.7L/dm in sequence2·min、135.9L/dm2·min、148.2L/dm2·min、165.8L/dm2·min、181.5L/dm2·min、198.6L/dm2·min；
(4) Embedding the framework into the integrated felt barrel, respectively welding the end parts with the flange and the bottom cover, connecting the end with smaller air permeability with the flange, and connecting the end with larger air permeability with the bottom cover to obtain the product
A metal filter bag.
(5) The experiment of the filtering and dust removing performance of the metal filter bag is carried out, the filtering wind speed is selected to be 1.2m/min, the standard dust Pural NF is adopted, and the experiment result is shown in the table 3.
Comparative example 1
The comparative example adopts the prior art to manufacture the metal filter bag for the high-temperature flue gas dust removal of the industrial kiln, and the manufacturing method comprises the following steps:
(1) metal fiber mats with a gas filtration accuracy of 0.5 μm were prepared using 2, 4 and 12 μm metal fibers and had a gas permeability of 79.3L/dm2Min, cutting the size of the fiber felt into a length of 1205mm and a width of 414 mm;
(2) rolling the cut metal fiber felt into a diameter of
Of felt cylinders, then longitudinal seam weldingObtaining a unit metal fiber felt cylinder;
(3) sequentially butt-welding 4 sections of the same unit metal fiber felt cylinders to obtain a metal fiber integrated felt cylinder;
(4) embedding the framework into the felt cylinder, and welding the end parts of the framework and the felt cylinder with the flange and the bottom cover respectively to obtain the composite material
A metal filter bag.
(5) The experiment of the filtering and dust removing performance of the metal filter bag is carried out, the filtering wind speed is selected to be 1.2m/min, the standard dust Pural NF is adopted, and the experiment result is shown in the table 1.
Comparative example 2
The comparative example adopts the prior art to manufacture the metal filter bag for the high-temperature flue gas dust removal of the industrial kiln, and the manufacturing method comprises the following steps:
(1) metal fiber felts with gas filtration accuracy of 1.0 μm were prepared with 6, 8 and 22 μm metal fibers and had a permeability of 134.7L/dm2Min, cutting the size of the fiber felt into 1155mm long and 507mm wide;
(2) rolling the cut metal fiber felt into a diameter
Then longitudinally seam-welding the felt cylinder to obtain a unit metal fiber felt cylinder;
(3) sequentially butt-welding 5 sections of the same unit metal fiber felt cylinders to obtain a metal fiber integrated felt cylinder;
(4) embedding the framework into the felt cylinder, and welding the end parts of the framework and the felt cylinder with the flange and the bottom cover respectively to obtain the composite material
A metal filter bag.
(5) The experiment of the filtering and dust removing performance of the metal filter bag is carried out, the filtering wind speed is selected to be 1.2m/min, the standard dust Pural NF is adopted, and the experiment result is shown in the table 2.
Comparative example 3
The comparative example adopts the prior art to manufacture the metal filter bag for the high-temperature flue gas dust removal of the industrial kiln, and the manufacturing method comprises the following steps:
(1) metal fiber felt with gas filtration precision of 1.5 mu m is prepared by adopting metal fibers with the particle sizes of 6 mu m, 8 mu m and 12 mu m, and the air permeability of the metal fiber felt is 182.3L/dm2Min, cutting the size of the fiber felt into 1150mm long and 507mm wide;
(2) rolling the cut metal fiber felt into a diameter of
Then longitudinally seam-welding the felt cylinder to obtain a unit metal fiber felt cylinder;
(3) sequentially butt-welding 6 sections of the same unit metal fiber felt cylinders to obtain a metal fiber integrated felt cylinder;
(4) embedding the framework into the felt cylinder, and welding the end parts of the framework and the felt cylinder with the flange and the bottom cover respectively to obtain the composite material
A metal filter bag.
(5) The experiment of the filtering and dust removing performance of the metal filter bag is carried out, the filtering wind speed is selected to be 1.2m/min, the standard dust Pural NF is adopted, and the experiment result is shown in the table 3.
TABLE 1 results of the experiment
Note: a. b, c, d represent pressure points at the middle of each cell mat A, B, C, D, respectively.
TABLE 2 results of the experiment
Note: a. b, c, d, e represent pressure points at the middle of each cell mat A, B, C, D, E, respectively.
TABLE 3 results of the experiment
Note: a. b, c, d, e, f represent pressure points at the middle of each cell mat A, B, C, D, E, F, respectively.
As can be seen from Table 1, compared with comparative example 1, the pulse-jet-blowing side wall pressure Cv value of the metal filter bag manufactured by the method of the invention is only 6.27%, which is far less than 60.63% in comparative example 1, which indicates that the side wall pressure distribution is more uniform when the metal filter bag manufactured by the invention is used for deashing, and the metal filter bag is beneficial to long-period balanced filtration of the filter bag. Meanwhile, the filtering resistance, the discharge concentration and the filtering efficiency of the metal filter bag manufactured by the invention are superior to those of the prior art. In addition, the above conclusions can be drawn from the experimental results of both tables 2 and 3. Therefore, the manufacturing method of the long-period high-efficiency filtering metal filter bag solves the problem of unbalanced filtering caused by poor local ash removal performance of the existing metal filter bag, and achieves the aim of long-period high-efficiency filtering of a metal filter bag dust removal system.
Finally, it should be noted that the above-mentioned technical solution is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application method and principle of the present invention disclosed, and the method is not limited to the above-mentioned specific embodiment of the present invention, so that the above-mentioned embodiment is only preferred, and not restrictive.
Claims (10)
1. A long cycle high efficiency filtration metal filter bag, said metal filter bag comprising:
the integrated felt cylinder is formed by butt welding a plurality of sections of unit metal fiber felt cylinders, and the air permeability of the plurality of sections of unit metal fiber felt cylinders is increased in sequence;
the framework is embedded into the integrated felt barrel, and two end parts of the framework are respectively connected with the flange and the bottom cover in a welding mode.
2. The long-period high-efficiency filtering metal filter bag according to claim 1, wherein the gas filtering accuracy of the multi-section unit metal fiber felt cylinder is the same.
3. The long-period high-efficiency filtering metal filter bag according to claim 1 or 2, wherein the unit metal fiber felt cylinder has a gas filtering precision of 0.5 μm, 1.0 μm or 2.0 μm and a gas permeability of 54-195L/dm2Min range.
4. The long-period efficient filtering metal filter bag according to claim 3, wherein the unit metal fiber felt cylinders comprise 4-6 sections, and the air permeability of the adjacent unit metal fiber felt cylinders is sequentially increased by 7% -15%.
5. The long-period high-efficiency filtering metal filter bag as claimed in claim 1, wherein the end with low air permeability of the integral felt cylinder is connected with the flange, and the end with high air permeability is connected with the bottom cover.
6. The manufacturing method of the long-period efficient filtering metal filter bag is characterized by comprising the following steps:
designing and manufacturing a plurality of metal fiber felts with the same precision and different air permeabilities, and cutting the metal fiber felts into required specification and size;
secondly, processing the cut metal fiber felt into a round shape to obtain a plurality of sections of unit metal fiber felt cylinders;
thirdly, sequentially butt-welding a plurality of sections of unit metal fiber felt cylinders according to the sequence of increasing the air permeability to form an integrated felt cylinder;
and fourthly, embedding the framework into the integrated felt barrel, and respectively welding the end parts of the framework and the flange and the bottom cover to obtain the metal filter bag.
7. The manufacturing method of the long-period efficient filtering metal filter bag according to claim 6, wherein in the first step, the metal fiber felt is made of metal drawing fibers with the diameter of 2-22 μm, and the metal fiber felt is made of stainless steel or temperature-resistant corrosion-resistant alloy;
preferably, the metal fiber mat has a gas filtration accuracy of 0.5 μm,1.0 mu m and 2.0 mu m, and the air permeability is 54-195L/dm2Min range.
8. The method as claimed in claim 6, wherein the metal fiber felt is processed into a round shape with a diameter of
9. The manufacturing method of the long-period efficient filtering metal filter bag according to claim 6, wherein in the third step, the integrated felt cylinder is formed by butt welding 4-6 sections of unit metal fiber felt cylinders, and the air permeability of the connected unit metal fiber felt cylinders is sequentially increased by 7% -15%.
10. The method for manufacturing a long-period high-efficiency filtering metal filter bag according to claim 6, wherein in the fourth step, the end with low air permeability of the metal filter bag is connected with the flange, and the end with high air permeability is connected with the bottom cover.
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| CN210356431U (en) * | 2019-11-26 | 2020-04-21 | 西安菲尔特金属过滤材料股份有限公司 | Long-life metal filter bag |
| CN213286017U (en) * | 2020-08-13 | 2021-05-28 | 常州市星干干燥设备有限公司 | Pulse bag-type dust collector |
| CN213286102U (en) * | 2020-09-23 | 2021-05-28 | 西安菲尔特金属过滤材料股份有限公司 | High-strength breathable metal filter bag barrel |
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| CN114307436B (en) | 2022-12-27 |
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