Sealing structure of industrial silicon negative pressure back-blowing large cloth bag dust collector

Abstract

The utility model relates to an industrial silicon negative pressure back blowing big cloth bag dust remover sealing structure, including the flower board, the surface of flower board is established with through -hole, still include the bottom support of fixed in the lower portion of flower board through -hole, have double -deck flanging's filter bag and at least two for fastening filter bag flanging on the clamp of bottom support outer wall, bottom support is the tubular structure of downward extension, and the top edge of bottom support is equipped with arc transition, and the upper end of bottom support is fixed below flower board through -hole through welding or screw thread connection mode, the filter bag bag mouth area has double -deck flanging structure, and the flanging is from below and upwards and is set in the bottom support outer periphery, and is sealed through multiple clamps and is pressed tightly, the utility model discloses double -deck clamp fastening, provides double locking force and sealing line, effectively resists system pressure fluctuation, fundamentally puts an end to the phenomenon of dust leakage, and two clamps are redundant for each other, even if one is slightly loose, another can still keep fastening, greatly reduces the risk of filter bag falling off.

Description

Technical Field

[0001] This utility model relates to the technical field of large bag dust collectors, specifically a sealing structure for an industrial silicon negative pressure reverse air large bag dust collector. Background Technology

[0002] The flue gas generated during industrial silicon smelting is characterized by high temperature, high corrosivity, high dust viscosity, fine dust particles, and strong abrasiveness. Currently, large baghouse dust collectors are widely used in this industry for flue gas purification. One of its core components is the sealing connection point between the tube sheet and the filter bag. In existing technologies, the common connection method is for the filter bag opening to be directly fitted onto the upper bottom support of the perforated plate. This structure has the following significant drawbacks: 1. Inadequate sealing: During industrial silicon flue gas backflushing (or reverse suction cleaning), the system pressure fluctuates drastically. The clamping force provided by the clamps is limited and uneven, making it difficult to maintain a seal under frequent pressure changes. This causes dust to leak from the gaps between the filter bag and the edge of the tube sheet holes to the clean gas side, resulting in emissions exceeding standards. 2. Risk of clamp detachment: Strong system vibration and air pressure impact can easily cause the fastening bolts of a single clamp to loosen, or even the entire clamp to fall off, causing the filter bag to fall off and the dust collector to fail. 3. Multiple dust leakage points: Dust may leak not only between the tube sheet and the filter bag, but also from the joint gaps of the clamps themselves and the contact surface between the clamps and the filter bag; Based on this, we propose a sealing structure for an industrial silicon negative pressure reverse-blowing large bag filter to solve the above problems. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a sealing structure for an industrial silicon negative pressure reverse-jet large bag dust collector. The overall sealing is more reliable, and it has better vibration resistance and can also protect the filter bags. This solves the problems of dust leakage caused by poor bag sealing, clamp detachment, and easy damage to the filter bag opening during the reverse-jet process in existing industrial silicon negative pressure reverse-jet large bag dust collector sealing structures.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sealing structure for an industrial silicon negative pressure reverse blowing large bag dust collector, including a tube sheet, the surface of which has through holes, and a base fixed below the through holes of the tube sheet, a filter bag with double-layer flanges, and at least two clamps for fastening the flanges of the filter bag to the outer wall of the base. The base is a downward-extending cylindrical structure, and the top edge of the base has a rounded transition (to avoid sharp angles cutting the filter bag material), and the upper end of the base is fixed to the bottom of the tube sheet through hole by welding or threaded connection. The filter bag opening area has a double-layer flange structure, which is fitted onto the outer periphery of the bottom support from bottom to top and is sealed by multiple clamps. The clamp includes a first clamp and a second clamp, which are arranged axially at intervals, and their fastening bolts are arranged in a staggered manner.

[0005] Furthermore, the height of the base is 60-80mm, and the radius of the arc transition at the top edge of the base is 3-8mm.

[0006] It should be noted that the outer diameter of the base is slightly smaller than the diameter of the through hole in the tube sheet to ensure that the filter bag can be smoothly fitted and tightly adhered to the inner wall.

[0007] Furthermore, the clamps are made of 304 or 316L stainless steel, and are either adjustable elastic band clamps or quick-release butterfly clamps.

[0008] Furthermore, the axial distance between the first clamp and the second clamp is 20-30mm, and the bolt installation angles of the two clamps are staggered by 90°-120°.

[0009] Furthermore, it also includes a sealing ring installed at the connection between the base plate and the tube sheet. The sealing ring is a high-temperature resistant fluororubber O-ring or a silicone sealing gasket, and the sealing ring is used for secondary sealing between the tube sheet and the base plate.

[0010] Furthermore, the outer wall of the bottom support is provided with longitudinal reinforcing ribs, numbering 2 to 4, with multiple longitudinal reinforcing ribs evenly distributed around the cylinder.

[0011] Furthermore, the double-layer flange of the filter bag is embedded with annular stainless steel wire or nylon reinforcing rings, located 5 to 15 mm from the top of the flange, to prevent the flange from bursting during backflushing cleaning, and the double-layer flange height of the filter bag is 160 to 200 mm.

[0012] It should be noted that the flange is made of PTFE-coated fiberglass cloth, which is resistant to high temperature and corrosion, and has good resilience and wear resistance.

[0013] Furthermore, at least one clamp is integrated with a preload monitoring sensor, which is used to detect the clamping status of the clamp in real time and transmit the signal to an external control system.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. The sealing structure of this industrial silicon negative pressure reverse air large bag dust collector adopts double-layer clamp fastening, providing double locking force and sealing line, effectively resisting system pressure fluctuations, fundamentally eliminating dust leakage. The two clamps are redundant to each other, so even if one is slightly loose, the other can still remain tight, greatly reducing the risk of filter bag falling off. 2. The sealing structure of this industrial silicon negative pressure reverse air bag dust collector features a unique 70mm high base and rounded transition edge design, providing a smooth, non-sharp-angled support surface for the filter bag to be turned over. This greatly reduces mechanical wear and stress concentration during the dust removal process, extending the service life of the filter bag. During the reverse air process, the flue gas passes directly through the filter bag, and there is no air leakage between the base and the filter bag. 3. The sealing structure of this industrial silicon negative pressure reverse air bag dust collector only requires adding a reverse bottom support component to the existing tube sheet. The installation process remains largely unchanged, but the performance is greatly improved. When replacing the filter bag, simply loosen the clamps, making maintenance convenient. Attached Figure Description

[0015] Figure 1 The diagram shown is a cross-sectional structural schematic of Embodiment 1 and Embodiment 3 of this utility model; Figure 2 The diagram shown is a cross-sectional structural schematic of Embodiment 2 of this utility model; Figure 3 The diagram shown is a schematic diagram of the base structure in Embodiment 2 of this utility model; Figure 4 The diagram shown is a cross-sectional structural schematic of embodiment four of this utility model; Figure 5 This utility model is shown. Figure 4 Enlarged structural diagram at point A in the middle.

[0016] Explanation of reference numerals in the attached diagram: 1. Tube plate; 2. Base support; 3. Filter bag; 4. First clamp; 5. Second clamp; 6. Sealing ring; 7. Preload monitoring sensor. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 Please see Figure 1 The sealing structure of an industrial silicon negative pressure reverse blowing large bag dust collector in this embodiment includes a tube sheet 1, a base support 2 fixed below the through hole of the tube sheet 1, a filter bag 3 with double-layer flanges, and two clamps for fastening the flanges of the filter bag 3 to the outer wall of the base support 2. The base 2 is a downward-extending cylindrical structure, and the top edge of the base 2 has a rounded transition. The filter bag 3 has a 180mm high double-layer flange structure at the bag opening area. The flange is fitted around the outer periphery of the bottom support 2 from bottom to top and is pressed and sealed by multiple clamps. The clamps include a first clamp 4 and a second clamp 5, which are arranged axially at intervals and their fastening bolts are staggered.

[0019] In this embodiment, the height of the base 2 is 70mm, and the radius of the arc transition at the top edge of the base 2 is 5mm; The clamps are made of 304 stainless steel and are adjustable elastic band clamps. The axial distance between the first clamp 4 and the second clamp 5 is 20mm, and the bolt installation angles of the two are staggered by 90° to 120°.

[0020] In this embodiment, the double-layer flange of the filter bag 3 is embedded with an annular stainless steel wire or nylon reinforcing ring, which is located 10mm from the top of the flange to prevent the flange from bursting during backflushing cleaning. The double-layer flange height of the filter bag 3 is 180mm.

[0021] It should be noted that this embodiment is widely applicable to industrial silicon furnace flue gas treatment systems under normal operating conditions, and has the advantages of simple installation, reliable sealing, and low maintenance costs.

[0022] In this embodiment, a sealing ring 6 is also provided at the connection between the base plate 2 and the flower plate 1. The sealing ring 6 is a high-temperature resistant fluororubber O-ring and is used for secondary sealing between the flower plate 1 and the base plate 2.

[0023] It should be noted that the sealing ring 6 is used to form a second leak-proof barrier, realizing a "double insurance" sealing system.

[0024] Example 2 Please see Figure 2 and Figure 3 This embodiment is an improvement on the first embodiment.

[0025] In this embodiment, the base support 2 is designed with a height of 70mm, but three evenly distributed longitudinal reinforcing ribs (thickness 1.5mm, height 5mm) are added to the outer wall of its cylinder to enhance the overall rigidity of the base support 2 and prevent fatigue cracking of the weld caused by long-term vibration. The ends of the reinforcing ribs are rounded to avoid scratching the filter bag 3.

[0026] The first clamp 4 and the second clamp 5 are thickened 304 stainless steel strip clamps (with T-nut locking mechanism), and the pre-tightening torque is controlled above 15 N·m to ensure that a constant clamping force is maintained under continuous vibration environment.

[0027] Furthermore, a thin steel wire ring (Φ0.8mm stainless steel wire) is embedded inside the double-layer flange of the filter bag 3, located 10mm from the top of the flange, to resist the radial expansion deformation during backflushing and prevent local loosening.

[0028] It should be noted that this embodiment is particularly suitable for dust collectors located close to the electric furnace body and where vibration sources are obvious, thus improving operational safety under extreme conditions.

[0029] Example 3 Please see Figure 1 This embodiment is an improvement on the first embodiment.

[0030] In this embodiment, the base material of the base 2 is made of carbon steel, but a polytetrafluoroethylene (PTFE) anti-corrosion coating with a thickness of ≥100μm is sprayed on its inner and outer surfaces, or a hot-dip galvanizing + epoxy resin sealing process is used to significantly improve its resistance to chemical corrosion.

[0031] The first clamp 4 and the second clamp 5 are made of 316L stainless steel instead of 304 stainless steel, which further enhances their resistance to chloride ion and acid gas corrosion.

[0032] The flanged part of filter bag 3 is made of P84 / PTFE composite needle-punched felt material, which can withstand temperatures up to 260℃. A hot-pressing process is added at the flanged crease to improve structural stability and reduce delamination damage caused by repeated bending.

[0033] It should be noted that this embodiment is applicable to the end-of-line dust removal system of industrial silicon production lines under high humidity and highly corrosive flue gas conditions.

[0034] Example 4 Please see Figure 4 and Figure 5 This embodiment introduces a status monitoring function based on embodiment two.

[0035] In this embodiment, a preload monitoring sensor 7 is integrated at the bolt root of the second clamp 5 to monitor changes in the clamp preload in real time. The signal is transmitted to the central control system via a wireless module.

[0036] When a clamp pressure drop exceeds a set threshold (e.g., 20% of the initial value), the system automatically alarms, indicating that there may be loosening or an impending leak at that location, allowing for timely intervention.

[0037] Meanwhile, a miniature dust probe is installed at the bottom of the base 2 to monitor whether a small amount of dust escapes from the clean air side, serving as direct evidence of seal failure.

[0038] All data is connected to the DCS system, supporting remote viewing and historical trend analysis.

[0039] It should be noted that this structure realizes the transformation from "passive maintenance" to "proactive prevention," and is suitable for modern industrial silicon production enterprises with high automation and strict environmental protection requirements.

[0040] The working principle of the above embodiments is as follows: During installation, the base 2 is first permanently fixed to the bottom of the ceiling 1 to form a smooth and sturdy mounting base.

[0041] When installing filter bag 3, slip the 180mm double-layer flange at the bag opening onto the bottom support 2 from below until it is in place.

[0042] Two 304 stainless steel clamps are tightened one after another. The strong clamping force generates great friction and sealing force between the flange layer of filter bag 3 and the surface of the bottom support 2 cylinder.

[0043] During the dust removal process, the back-blowing airflow impacts the filter bag 3 upwards. The 70mm height of the base 2 provides sufficient wrapping and support depth to prevent the filter bag 3 from being "blown off" under air pressure. The smooth, rounded edges completely avoid the risk of the filter bag 3 being cut when it shakes.

[0044] Double sealing protection: The first seal is achieved by the main sealing surface provided by two clamps; the second seal is achieved by the sealing ring 6 (if installed) between the flange of the base 2 and the tube sheet 1, completely blocking any path of dust upward leakage. It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail here.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for an industrial silicon negative pressure reverse-blowing bag filter, comprising a tube sheet (1), characterized in that: It also includes a base support (2) fixed below the through hole of the tube sheet (1), a filter bag (3) with double-layer flanges, and at least two clamps for fastening the flanges of the filter bag (3) to the outer wall of the base support (2); The base (2) is a downward-extending cylindrical structure, and the top edge of the base (2) is provided with a rounded transition; The filter bag (3) has a double-layer flange structure at the bag opening area. The flange is fitted from bottom to top on the outer periphery of the base (2) and is sealed by multiple clamps. The clamps include a first clamp (4) and a second clamp (5), which are arranged axially at intervals and their fastening bolts are staggered.

2. The sealing structure of an industrial silicon negative pressure reverse-blowing large bag filter dust collector according to claim 1, characterized in that: The height of the base (2) is 60-80mm, and the radius of the arc transition at the top edge of the base (2) is 3-8mm.

3. The sealing structure of an industrial silicon negative pressure reverse-blowing large bag filter dust collector according to claim 1, characterized in that: The clamps are made of 304 or 316L stainless steel and are either adjustable elastic band clamps or quick-release butterfly clamps.

4. The sealing structure of an industrial silicon negative pressure reverse-blowing large bag filter dust collector according to claim 1, characterized in that: The axial distance between the first clamp (4) and the second clamp (5) is 20-30mm, and the bolt installation angles of the two are staggered by 90°-120°.

5. The sealing structure of an industrial silicon negative pressure reverse-blowing large bag filter dust collector according to claim 1, characterized in that: It also includes a sealing ring (6) set at the connection between the base plate (2) and the flower plate (1). The sealing ring (6) is a high-temperature resistant fluororubber O-ring or a silicone sealing gasket. The sealing ring (6) is used for secondary sealing between the flower plate (1) and the base plate (2).

6. The sealing structure of an industrial silicon negative pressure reverse-blowing large bag filter dust collector according to claim 1, characterized in that: The outer wall of the bottom support (2) is provided with longitudinal reinforcing ribs, the number of which is 2 to 4, and multiple longitudinal reinforcing ribs are evenly distributed around the cylinder.

7. The sealing structure of an industrial silicon negative pressure reverse-blowing large bag filter dust collector according to claim 1, characterized in that: The double-layer flange of the filter bag (3) is inlaid with annular stainless steel wire or nylon reinforcing ring, which is located 5 to 15 mm from the top of the flange. This is to prevent the flange from cracking during backflushing and cleaning. The double-layer flange height of the filter bag (3) is 160 to 200 mm.

8. The sealing structure of an industrial silicon negative pressure reverse-blowing large bag filter dust collector according to claim 1, characterized in that: At least one clamp is equipped with a preload monitoring sensor (7), which is used to detect the clamping status of the clamp in real time and transmit the signal to the external control system.

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