High temperature filter element sealing structure and filter

Abstract

The present invention relates to the field of gas treatment and filtration, and specifically, to a high-temperature filter element sealing structure and a filter. The high-temperature filter element sealing structure includes a filter element and a fixed component, the fixed component is arranged at the air outlet of the filter element and is connected to the filter element; a first seal is arranged between the fixed component and the filter element; the high-temperature filter element sealing structure includes a protective cover that prevents the back-blowing airflow from impacting the first seal during the back-blowing process, the protective cover is arranged between the fixed component and the first seal, and the fixed component and the first seal are respectively connected to the protective cover. The first seal is protected by the protective cover to prevent the back-blowing gas from acting on the first seal during the back-blowing process, thereby ensuring the structural integrity of the first seal, so that the high-temperature filter element sealing structure always has good sealing performance, ensuring that all raw coal gas is filtered through the high-temperature filter element sealing structure, and ensuring the filtering effect of the high-temperature filter element sealing structure.

Description

Technical Field

[0001] The invention relates to the field of coal gas processing and filtering, and in particular to a high-temperature filter element sealing structure and a filter. Background Art

[0002] The raw gas produced by pyrolysis of crushed coal contains a lot of dust. During the filtering process, a lot of dust will adhere to the outer surface of the filter element in the filter. After a long time, the filter element will be blocked, which will cause the filter to fail and shorten the service life of the filter. In order to reduce blockage, ensure the filtering effect, and allow the filter element to have a longer period of normal filtering, it is necessary to use instantaneous rapid backflushing to shake off the dust on the surface of the filter element. However, in the actual production process, the filtering effect of the filter device after backflushing is not obviously restored, resulting in dust remaining in the raw gas filtered after backflushing, affecting subsequent production. Summary of the invention

[0003] The purpose of the present invention includes, for example, providing a high-temperature filter element sealing structure and a filter. The high-temperature filter element sealing structure is durable and eliminates the problem that the seal of the previous filter fails due to backblowing, which leads to the filtered gas still containing a lot of dust, thus laying a good foundation for subsequent processes.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, an embodiment of the present invention provides a high-temperature filter element sealing structure, which is used for filtering raw coal gas generated by coal pyrolysis, and includes a filter element and a fixing assembly for fixing the filter element, wherein the fixing assembly is arranged at the gas outlet of the filter element and connected to the filter element;

[0006] A first sealing member is provided between the fixing assembly and the filter element for improving the sealing performance of the sealing structure of the high-temperature filter element;

[0007] The high-temperature filter element sealing structure includes a protective cover that prevents the back-blowing airflow from impacting the first sealing member during the back-blowing process. The protective cover is arranged between the fixed component and the first sealing member, and the fixed component and the first sealing member are respectively connected to the protective cover.

[0008] The inventors have discovered that during the backblowing process in the prior art, the backblowing gas will act on the seal between the fixed component and the end of the high-temperature filter element sealing structure, thereby destroying the seal structure, thereby reducing the sealing performance of the seal, and causing part of the raw coal gas not to pass through the filter element of the filter when filtering is performed again after backblowing, but to directly enter the filtered gas through the gap where the seal is lost, thereby causing the final gas to still contain dust, reducing the filtering effect of the filter. In the present invention, the inventors creatively use a protective cover to protect the seal to prevent the backblowing gas from acting on the seal during the backblowing process, thereby ensuring the sealing performance of the seal, and thereby improving the filtering performance of the high-temperature filter element sealing structure.

[0009] In an optional embodiment, the protective sleeve includes a first protective portion and a second protective portion, the first protective portion preventing the backwash airflow from impacting a side of the first sealing member relatively close to the fixing assembly, and the second protective portion preventing the backwash airflow from impacting a side of the first sealing member;

[0010] The first protecting part is connected to the second protecting part, the first protecting part is located between the first sealing member and the fixing assembly, the fixing assembly and the first sealing member are respectively connected to two opposite sides of the first protecting part, and the second protecting part is connected to a side surface of the first sealing member.

[0011] In an optional embodiment, the second protecting portion completely covers a side surface of the first sealing component.

[0012] In an optional embodiment, the angle between the first protection portion and the second protection portion is 80-100 degrees, preferably 90 degrees;

[0013] Preferably, the thickness of the protective cover is 1-3 mm.

[0014] In an optional embodiment, the filter element is a filter element with a hollow structure, and the bottom of the filter element is self-sealing.

[0015] In an optional embodiment, the neck of the filter element is in the shape of an outward-expanding cone neck.

[0016] In an optional embodiment, the high-temperature filter element sealing structure further includes a supporting orifice plate, and the fixing assembly, the first sealing member, and the filter element are all connected to the supporting orifice plate.

[0017] In an optional embodiment, a second seal is provided between the neck of the filter element and the supporting orifice plate.

[0018] In an optional embodiment, the fixing assembly includes a pressure seat and a pressure plate, the pressure seat is connected to the protective cover, and the pressure plate is connected to the pressure seat.

[0019] In the second aspect, an embodiment of the present invention provides a filter, which includes a filter housing and a high-temperature filter element sealing structure as described in any one of the aforementioned embodiments, wherein the high-temperature filter element sealing structure is arranged inside the filter housing, and the high-temperature filter element sealing structure divides the filter inner cavity into an air inlet cavity and an air outlet cavity.

[0020] Beneficial effects of the embodiments of the present invention: The present invention creatively uses a protective cover to protect the first seal between the fixed component and the filter element to prevent the backblowing gas from acting on the first seal during the backblowing process, thereby ensuring the structural integrity of the first seal, so that the high-temperature filter element sealing structure always has good sealing performance, ensuring that all raw coal gas is filtered through the high-temperature filter element, and ensuring the filtering effect of the high-temperature filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic structural diagram of a high-temperature filter element sealing structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of a fixing assembly provided in an embodiment of the present invention;

[0024] Figure 3 A schematic structural diagram of the connection between the supporting orifice plate and the second sealing member provided in an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the structure of a filter provided in an embodiment of the present invention.

[0026] Icons: 100-high-temperature filter element sealing structure; 101-filter element; 110-fixing assembly; 120-first sealing member; 130-protective sleeve; 131-first protection part; 132-second protection part; 111-pressure seat; 112-pressure plate; 140-support orifice plate; 150-second sealing member; 200-filter; 201-filter housing; 202-air inlet chamber; 203-air outlet chamber. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0032] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0033] Example

[0034] This embodiment provides a high-temperature filter element sealing structure 100, which is used for filtering raw gas generated by coal pyrolysis, so that the dust content of the filtered clean gas is less than 10-8 mg / m 3. Specifically, the filtration of raw gas requires sealing of the filter body and back-blowing of the high-temperature filter, so that the dust adsorbed or residual on the outer surface of the filter element of the high-temperature filter while filtering the raw gas can be blown away by back-blowing, so that the high-temperature filter can be used for a long time. However, the inventor found that after the high-temperature filter has been used for a period of time, the high-temperature filter has been back-blown, and the filtered gas still contains a lot of dust. After stopping the filtration, the high-temperature filter was checked and it was found that the seal of the filter body was gone. After analysis, it was believed that the back-blowing airflow blew away the seal. Because the flow rate of the back-blowing gas can be as high as tens of meters per second, the back-blowing airflow has a large impact force on the various components of the high-temperature filter, especially the seal between the fixed component and the filter element. When it is subjected to a large impact force of the back-blowing airflow, the seal is blown to pieces, and even the seal disappears completely, which leads to a reduction in the sealing performance of the seal, and then the raw gas filtration fails to achieve the desired filtering effect.

[0035] Therefore, see Figure 1 Based on the above technical problems, the inventors creatively invented a high-temperature filter element sealing structure 100, which includes a filter element 101. The filter element 101 is used to filter raw gas. The filter element 101 is a filter element with a hollow structure. Specifically, in the present embodiment, it is a circular cylinder with a hollow structure, but it can be understood that filter elements 101 of other shapes or structures are also within the protection scope of the present invention.

[0036] Specifically, the bottom of the filter element 101 is self-sealing, that is, when the filter element 101 is prepared, its bottom has been formed, and the gas enters the cavity of the filter element 101 along the outer circumference direction of the filter element 101 through the wall of the filter element containing a large number of fine pores, thereby achieving filtration. The neck of the filter element 101 is in an outward-expanding conical neck shape, which makes it easy to fix the filter element 101 and prevent the high-temperature filter element sealing structure 100 from moving during use, thereby ensuring the filtering effect.

[0037] Specifically, the working process of the high-temperature filter element sealing structure 100 is as follows: using the pressure difference between the inside and outside of the filter element 101, the raw gas enters the inner cavity of the filter element 101, that is, the hollow part, from the outer wall of the filter element 101, and then flows out from the air outlet of the high-temperature filter element sealing structure 100, that is, the filtered raw gas is obtained. During back-blowing: the back-blowing airflow enters the air outlet of the high-temperature filter element sealing structure 100 at a speed of several tens of meters per second, and the time of passing is 0.2-1 seconds, and then filtering is performed.

[0038] See also Figure 2The high-temperature filter element sealing structure 100 also includes a fixing assembly 110 for fixing the filter element 101. The fixing assembly 110 is arranged at the air outlet of the filter element 101 and connected to the filter element 101. The fixing assembly 110 presses the filter element 101 to prevent the filter element 101 from shaking or moving in the vertical direction during the filtering or back-blowing process, thereby ensuring the filtering effect. Figure 3 The fixing assembly 110 includes a pressure seat 111 and a pressure plate 112. The pressure plate 112 is connected to the pressure seat 111. Both the pressure seat 111 and the filter element 101 are provided with air outlets. The pressure seat 111 and the pressure plate 112 are used to press the high-temperature filter element sealing structure 100, thereby further improving the stability of the high-temperature filter element sealing structure 100. The pressure seat 111 is further compressed by the pressure plate 112 to improve the sealing firmness.

[0039] The pressure seat 111 and the filter element 101 are both rigid structures. When two rigid structures are connected, there will inevitably be a certain problem of poor sealing. The high-temperature filter element sealing structure 100 requires good sealing performance. Therefore, a first seal 120 for improving the sealing performance of the high-temperature filter element sealing structure 100 is arranged between the fixed component 110 and the filter element 101, and the filter element 101 and the fixed component 110 are both connected to the first seal 120.

[0040] It should be noted that the filter element 101 of the high-temperature filter element sealing structure 100 is a hollow structure, and the pressure seat 111 is arranged at the air outlet of the filter element 101 to press the filter element 101 to prevent the high-temperature filter element sealing structure 100 from moving. Therefore, in order to ensure the flow of gas, the pressure seat 111 is also a hollow structure.

[0041] Since the filtered gas is raw gas with a certain temperature, in order to ensure the sealing effect, the raw material for preparing the first seal 120 is an existing raw material that is resistant to high temperature and corrosion, such as a high temperature resistant ceramic fiber mat. That is to say, the first seal 120 is a sealing structure made of a high temperature resistant ceramic fiber mat.

[0042] Although the first seal 120 improves the sealing performance, during the back-blowing process, the back-blowing airflow has a great impact on the first seal 120, causing the first seal 120 to be often blown to pieces or even disappear, thereby reducing the sealing performance, and thus reducing the filtering effect. Therefore, the high-temperature filter element sealing structure 100 of the present invention also includes a protective cover 130 that prevents the back-blowing airflow from impacting the first seal 120 during the back-blowing process. The protective cover 130 is arranged between the fixed component 110 and the first seal 120. The fixed component 110 and the first seal 120 are respectively connected to the protective cover 130, and the protective cover 130 is connected to the pressure seat 111. The protective cover 130 provides good protection for the first seal 120, and can prevent the back-blowing airflow entering from the air outlet of the filter element 101 from impacting the first seal 120 during the back-blowing process, thereby ensuring the structural integrity of the first seal 120, ensuring that the first seal 120 can play a good sealing role, and then ensuring the filtering effect of the high-temperature filter element sealing structure 100.

[0043] Specifically, the protective sleeve 130 includes a first protective portion 131 and a second protective portion 132, wherein the first protective portion 131 prevents the back-blowing airflow from impacting the side of the first seal 120 that is relatively close to the fixed assembly 110, and the second protective portion 132 prevents the back-blowing airflow from impacting the side of the first seal 120. Since the back-blowing airflow enters the filter element 101 from the air outlet of the filter element 101 during back-blowing, it will cause a large impact on the side of the first seal 120 that is relatively close to the fixed assembly 110 and the side of the first seal 120, and the first protective portion 131 and the second protective portion 132 can well protect the above two planes of the first seal 120, thereby ensuring that the first seal 120 will not be subjected to a large impact force of the back-blowing airflow, thereby ensuring the filtering effect of the high-temperature filter element sealing structure 100.

[0044] Specifically, the first protecting portion 131 and the second protecting portion 132 are connected, the first protecting portion 131 is located between the first sealing member 120 and the fixing assembly 110, the fixing assembly 110 and the first sealing member 120 are respectively connected to the two opposite sides of the first protecting portion 131, and the second protecting portion 132 is connected to the inner side surface of the first sealing member 120.

[0045] Furthermore, the second protection portion 132 completely covers the inner side surface of the first seal 120 , thereby being able to better protect the first seal 120 , reduce the effect of the backwash airflow on the first seal 120 , and improve the filtering effect of the high-temperature filter.

[0046] Furthermore, the angle between the first protection portion 131 and the second protection portion 132 is 80-100 degrees, so that the protective cover 130 is L-shaped, preferably 90 degrees. The thickness of the protective cover 130 is 1-3 mm, for example, 1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, and 3 mm.

[0047] The protective cover 130 may be made of a material that is resistant to high temperatures and corrosion, such as stainless steel. The protective cover 130 may be a stamping part. The advantages of using a stamping part are that the size of the stamping part is consistent, the production efficiency is high, and the cost is low.

[0048] Furthermore, the structures of the first protection portion 131 and the second protection portion 132 may vary with the shape structure of the side relatively close to the fixing assembly 110 and the side surface of the first sealing gasket, and are not limited to the shapes described in this embodiment.

[0049] Further, see Figure 3 The high-temperature filter element sealing structure 100 further includes a supporting orifice plate 140, and the fixing assembly 110, the first sealing member 120 and the filter element 101 are all connected to the supporting orifice plate 140. The supporting orifice plate 140 can fix and support the filter element 101 in the horizontal direction, further preventing the filter element 101 from moving during filtering or back-blowing, especially in the horizontal direction, thereby ensuring the filtering effect of the high-temperature filter.

[0050] Furthermore, since the neck of the filter element 101 is in the shape of an outward-expanding conical neck, the portion where the supporting orifice plate 140 is connected to the filter element 101 is prone to poor sealing. If the sealing effect here is reduced, the sealing performance of the entire high-temperature filter will also be reduced, which in turn will lead to a reduction in the filtering effect of the high-temperature filter. Therefore, a second seal 150 is provided between the neck of the filter element 101 and the supporting orifice plate 140; the second seal 150 is a seal formed by winding a high-temperature resistant material along the neck of the filter element 101. The second seal 150 is prepared in the above manner, which can ensure the sealing performance of the second seal 150.

[0051] Furthermore, the inventors have also found that the reason why the filtering effect of the high-temperature filter after backblowing in the prior art is reduced is not only because the backblowing airflow impacts the first seal 120, causing the structure of the first seal 120 to be destroyed, and the sealing performance of the sealed area of ​​the first seal 120 is reduced. It also includes that after the structure of the first seal 120 is destroyed, the force between the second seal 150 and the supporting orifice plate 140 is reduced, which in turn reduces the sealing effect of the second seal 150, further causing the sealing effect to be reduced, resulting in a further reduction in the filtering effect of the high-temperature filter. Protecting the first seal 120 not only ensures the sealing performance of the first seal 120, but also enables the second seal 150 and the supporting orifice plate 140 to have a good force, and then also ensures the performance of the second seal 150, and then improves the sealing performance of the high-temperature filter as a whole, ensuring the filtering performance of the high-temperature filter, so that the filtering performance of the high-temperature filter after backblowing is guaranteed.

[0052] Further, see Figure 4 This embodiment also provides a filter 200, which includes a filter housing 201 and a high-temperature filter element sealing structure 100 as described in any one of the above embodiments, wherein the high-temperature filter element sealing structure 100 is arranged inside the filter housing 201, and the supporting orifice plate 140 is connected to the filter housing 201, so that the high-temperature filter element sealing structure 100 divides the inner cavity of the filter 200 into an air inlet cavity 202 and an air outlet cavity 203. The raw gas passes through the air inlet cavity 202 and then through the filter element 101, is filtered, flows out from the air outlet of the filter element 101, and then enters the air outlet cavity 203, and then the filtered gas flows out of the filter 200.

[0053] It should be noted that the high temperature recorded in the present invention, such as the high temperature filter and the high temperature filter element, refers to raw coal gas of 400-600°C. That is to say, the high temperature filter and the high temperature filter element are components that can handle raw coal gas of 400-600°C, and their structure will not be deformed due to this temperature.

[0054] In summary, the present invention provides a high-temperature filter element sealing structure, which protects the first seal between the fixed component and the filter element by setting a protective sleeve to prevent the backblowing gas from acting on the first seal during the backblowing process, thereby ensuring the structural integrity of the first seal, so that the high-temperature filter element sealing structure always has good sealing performance, ensuring that all raw coal gas is filtered through the filter element of the high-temperature filter, and ensuring the filtering effect of the high-temperature filter. At the same time, ensuring the structural integrity of the first seal can also ensure that the second seal between the supporting orifice plate and the high-temperature filter element sealing structure can play a good sealing role, further ensuring the filtering effect of the high-temperature filter.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-temperature filter element sealing structure, characterized in that: It is used for filtering raw coal gas generated by coal pyrolysis, and comprises a filter element and a fixing assembly for fixing the filter element, wherein the fixing assembly is arranged at the gas outlet of the filter element and connected to the filter element; A first sealing member is provided between the fixing assembly and the filter element for improving the sealing performance of the sealing structure of the high-temperature filter element; The high-temperature filter element sealing structure also includes a protective sleeve for preventing the back-blowing airflow from impacting the first sealing member during the back-blowing process, wherein the protective sleeve is arranged between the fixing assembly and the first sealing member, and the fixing assembly and the first sealing member are respectively connected to the protective sleeve; The protective sleeve comprises a first protective portion and a second protective portion, wherein the first protective portion prevents the back-blowing airflow from impacting a side of the first sealing member relatively close to the fixing assembly, and the second protective portion prevents the back-blowing airflow from impacting a side of the first sealing member; The first protection part is connected to the second protection part, the first protection part is located between the first sealing member and the fixing assembly, the fixing assembly and the first sealing member are respectively connected to two opposite sides of the first protection part, and the second protection part is connected to a side surface of the first sealing member; The second protection portion completely covers the side of the first sealing member; the angle between the first protection portion and the second protection portion is 80-100 degrees, so that the protection sleeve is L-shaped; The first sealing member is a sealing structure made of a high temperature resistant ceramic fiber mat.

2. The high temperature filter element sealing structure according to claim 1, characterized in that: The included angle between the first protection portion and the second protection portion is 90 degrees.

3. The high temperature filter element sealing structure according to claim 1, characterized in that: The thickness of the protective cover is 1-3 mm.

4. The high temperature filter element sealing structure according to claim 1, characterized in that: The filter element is a filter element with a hollow structure, and the bottom of the filter element is self-sealing.

5. The high temperature filter element sealing structure according to claim 4, characterized in that: The neck of the filter element is in an outwardly expanding cone neck shape.

6. The high temperature filter element sealing structure according to claim 5, characterized in that: The high-temperature filter element sealing structure also includes a supporting orifice plate, and the fixing assembly, the first sealing member and the filter element are all connected to the supporting orifice plate.

7. The high temperature filter element sealing structure according to claim 6, characterized in that: A second sealing member is provided between the neck of the filter element and the supporting orifice plate.

8. The high temperature filter element sealing structure according to claim 7, characterized in that: The second sealing member is a sealing member formed by winding a high temperature resistant material along the neck of the filter element.

9. The high temperature filter element sealing structure according to claim 1, characterized in that: The fixing assembly comprises a pressure seat and a pressure plate, wherein the pressure seat is connected to the protective cover, and the pressure plate is connected to the pressure seat.

10. A filter, comprising a filter housing and a high-temperature filter element sealing structure according to any one of claims 1 to 9, wherein the high-temperature filter element sealing structure is arranged inside the filter housing, and the high-temperature filter element sealing structure divides the filter inner cavity into an air inlet cavity and an air outlet cavity.

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