Cartridge filter

Abstract

The invention relates to devices for removing dust and particulates from gas-air flows and can be used in various branches of industry, and in particular in the chemical industry, for example, during the production of nitric acid in cartridge (bag) filters for trapping platinum group metals. The present cartridge filter comprises a housing, a rod, an eccentric lever pivotally connected to the end of the rod, an anchor element arranged at the opposite end of the rod and perpendicular to the axis thereof, and a pointer, rigidly mounted on the rod, for indicating the orientation of the anchor element. The technical result is that of making it possible to visually monitor the position (orientation) of the anchor element as the filter is installed in a seat, as well as to prevent slippage of the anchor element of a filter locking mechanism.

Description

[0001] Cartridge filter

[0002] Field of technology

[0003] The invention relates to devices for cleaning gas-air flows from dust and aerosols and can be used in various branches of industry, in particular in the chemical industry, for example in the production of nitric acid in cartridge (bag) filters for capturing platinum group metals.

[0004] Prior art

[0005] Nitric acid production technology involves the oxidation of ammonia on precious metal catalyst gauzes at high temperatures (780-9500°C). The process inevitably wears out the gauzes: the gauze's mass decreases due to the evaporation of platinum oxides from its surface and the chipping of platinum alloy particles. To reduce irreversible losses, various collection systems are used, such as collection gauzes installed in the "hot" zone of the contact unit (immediately after the catalyst gauzes) and filter elements located at the unit's outlet, at the end of the process chain.

[0006] The efficiency of filter elements is significantly affected by the reliability of their installation (in addition to the filter material): the contact unit, under the influence of high temperatures and flow pressure, experiences vibration loads, which leads to loosening of the fastening of removable elements, including filter elements.

[0007] The simplest method for attaching a filter to a sleeve plate is as follows: A section of the sleeve is placed over the flanged nozzle of the sleeve plate and secured with a clamp. However, this mounting device is only suitable for filters without a rigid housing and therefore offers limited reliability.

[0008] A bag filter element with a filter package and a method for attaching it to a pipe panel are known (RU2488426, published July 27, 2013). The method for attaching the bag filter element to the pipe panel is accomplished by securing it at two points such that its front part—the neck—forms a hermetically sealed connection between the filter element and the pipe panel via a branch pipe on the pipe panel, the front part of the filter element—the neck with a thickening along the leading edge, and a sealing ring. The length of the sealing ring corresponds to the length of the pipe panel branch. When assembled, they form a wedge-shaped connection resistant to mechanical impacts and pressure fluctuations. The neck of the filter element is clamped between the branch pipe of the pipe panel and the sealing ring. The rear part of the bag filter element is secured to the supporting grid using a plastic clamp.

[0009] A disadvantage of the known fastening method is its complex design and, consequently, the difficulty of installation and disassembly. Attaching the filter elements requires significant modification of the unit, specifically the installation of additional components (a pipe panel and a support grid). Furthermore, positioning the filter element neck between the pipe panel nozzle and the insert ring (for clamping) is extremely difficult due to the small diameter of the nozzles and rings. The rear of the filter element is sewn through, making installation impossible.

[0010] The closest in technical essence is a filter for capturing platinum group metals in the AK-72 contact unit for the production of nitric acid (TECHNOPROMIMPEX company, https: / / techemen.com / ru / equipment / pgm-capture-system-in-the-contact-apparatus-of-the-ak-72-unit / , accessed on 18.02.2025). The filtration system is installed in the lower part of the contact apparatus in the space between the heat exchanger casing and the contact apparatus body and consists of a support plate and mesh filter elements. Each filter element is a rigid cylindrical frame with double mesh walls, between which the filter element is placed, and is equipped with a fastening device rigidly installed in the filter element body. The fastening device includes an eccentric lever pivotally connected to a rod passing inside the frame, along its geometric axis.At the opposite end of the rod, a rod is positioned transversely to the rod axis (forming a T-shaped rod end) and extends beyond the filter element housing. The filter element is installed by inserting it into the mounting hole (hole) of the support plate so that the rod passes between the guides of this mounting hole (parallel to them) and ends up on the other side of the guides. The filter element (along with the mounting device) is then rotated around its axis so that the rod is oriented transversely to the aforementioned guides. The eccentric lever is pressed, which lifts the rod and rod toward the lever, thereby pressing the filter element frame flange against the support plate. The filter can be installed in any plane (horizontally or vertically, with the filter bar facing up or inverted, i.e., with the bar facing down).

[0011] However, installing the described filter and its mounting device is inconvenient, complex, and very labor-intensive, due to the following. Since the mounting device is rigidly installed in the filter element housing, i.e., it cannot rotate around its axis, when installing the filter into its mounting location, it is necessary to precisely orient the rod between the guides in the mounting location, rotating the filter housing around its axis, "aiming" the rod between the guides of the mounting location. Given the filter's significant dimensions and weight, this is quite difficult (the rod is not visible when personnel are at eye level on the side of the filter opposite the rod), especially when installing the filter vertically with the rod facing upward, or in confined spaces (in the unit housing with adjacent filters installed). All of these factors contribute to inconvenient operation, complexity, and time-consuming installation.

[0012] Furthermore, in nitric acid production units, processes are accompanied by high temperatures and pressures of gas flows (often in the production of other substances, as well as in other equipment). The dynamic forces of air flows cause filters to become loose (they are typically quite tall with a relatively small diameter), as the filter mounting rod has a small support surface, corresponding to the thickness of the support plate guides. This loosening effect is particularly pronounced when filters are installed vertically with the rod facing upward. Loosening of the filters leads to depressurization of the mounting, gas leakage, and, consequently, increased irreversible losses of platinum group metals (or other captured materials or substances).In addition, when loosened, the contact of the fixing element (rod) with the guides weakens, and the rods shift along the surface of the guides due to vibrations (orientation to a position parallel to the guides), which leads to the filters falling out of their seats. Disclosure of the invention.

[0013] The technical challenge is to develop a reliable filter that is easy to maintain and install, characterized by a long-term tightness of attachment to the sleeve plate, as well as the development of a sleeve plate that ensures reliable and tight attachment of cartridge filters, as well as ease of installation and maintenance.

[0014] The technical result consists in providing visual control of the position (orientation) of the locking element during the installation of the filter in the seat, in eliminating the sliding displacement of the locking element of the filter locking mechanism, and increasing the area of ​​its support.

[0015] The claimed technical result is achieved due to the fact that the cartridge filter, which includes a housing, a rod, an eccentric lever pivotally connected to the end of the rod, and a locking element located at the opposite end of the rod perpendicular to its axis, according to the invention is equipped with an indicator of the position of the locking element, rigidly mounted on the rod.

[0016] In particular embodiments of the device, the locking element is made in the form of a rod and / or the position indicator is made in the form of a flag.

[0017] The claimed technical result is also achieved due to the fact that the device for fastening the cartridge filter, including a rod, an eccentric lever pivotally connected to the end of the rod, and a locking element located at the opposite end of the rod perpendicular to its axis, according to the invention is equipped with an indicator of the position of the locking element, rigidly mounted on the rod.

[0018] In particular embodiments of the device, the locking element is made in the form of a rod and / or the position indicator is made in the form of a flag.

[0019] Equipping a cartridge filter or cartridge filter mounting device with the aforementioned indicator allows for the position of the locking element to be determined when personnel are installing it into the housing, i.e., holding the filter housing on the side opposite the filter rod, even when the rod is completely invisible. Clearly identifying the orientation of the locking element allows for the first-time installation of the filter, aligning the locking element precisely parallel to the mounting guides, eliminating the risk of damaging the rod on the guides.The claimed technical result is also achieved due to the fact that in a plate for fastening cartridge filters, including a base with openings provided with two guide elements for the fixing element of the cartridge filter, installed parallel and at a distance from each other in the opening of the opening, according to the invention, the guide elements are made in the form of shaped plates, each of which has an L-shaped profile, while the plates are installed in a mirror-symmetrical manner.

[0020] In particular embodiments of the device, the plates are installed at a distance of 0.25D-0.5D, where D is the diameter of the hole and / or the L-shaped profile is made with a recess in the inner corner and / or the plates are made 5-20 mm thick.

[0021] The stated design features ensure that the locking element of the filter locking mechanism rests on the vertical shelves of the L-shaped profiles, eliminating its sliding movement along the horizontal shelves of the said profiles, which together ensures the reliability and tightness of the fastening (fixation) of the cartridge filters.

[0022] In specific device applications, depending on the weight and dimensions of the filters being installed, it is advisable to select the plate thickness (5-20 mm) and plate spacing that ensures the greatest vibration resistance of the filters (0.25D-0.5D), thereby further enhancing the technical result. Incorporating a recess in the L-shaped profile also contributes to increased vibration resistance.

[0023] Brief description of the drawings

[0024] The preferred embodiment of the claimed invention is illustrated graphically by Figures 1-8 and described in detail below. The general embodiment of the invention includes the preferred embodiment, but is not limited to it. The following figures are shown: Fig. 1 - a cartridge-type filter with a fastening device, side view;

[0025] Fig. 2 - cartridge type filter with fastening device, front view;

[0026] Fig. 3 - cartridge type filter with fastening device, section by axial plane;

[0027] Fig. 4 - view of the eccentric lever and the position indicator of the locking element (lever in the closed position);

[0028] Fig. 5 - view of the fixing element (in the form of a rod); Fig. 6 - support plate with filters installed on it, each of which is fixed by the claimed fastening device;

[0029] Fig. 7 - support plate (bottom view) with filters installed on it;

[0030] Fig. 8 - guide element of the support plate.

[0031] Implementation of the invention

[0032] The device for fastening the cartridge filter includes a rod 1, an eccentric lever 2 pivotally connected to the end of the rod 1, a locking element 3 located on the opposite end of the rod 1 perpendicular to its axis, and an indicator 4 of the position of the locking element rigidly mounted on the rod. The locking element 3 can be made in the form of a rod or a bar, and the orientation indicator 4 can be made in the form of a flag. The ability of the indicator 4 to perform its function (indication / information on the orientation direction of the element 3) is ensured by its rigid fixation relative to the position of the locking element 3. Thus, the most optimal is when the indicator 4 is made flat and is located in a plane perpendicular to the vertical axial plane of the locking element 3 (in Figs. 1-5). Other options are possible, for example, when the indicator 4 is made flat and is located in a plane coinciding with the vertical axial plane of the locking element 3 (not shown in the Fig.).

[0033] The plate for fastening cartridge filters is a base 5 with openings 6, provided with two guide elements 7 for the fixing element 3 of the cartridge filter.

[0034] Guide elements 7 are formed as shaped plates, each with an L-shaped profile, and are installed in a mirror-like symmetry. Elements 7 are mounted at a distance from one another within the opening 6, on the edge of the plate.

[0035] The base 5 and the guide elements 7 are preferably made of metal, from materials resistant to aggressive environments.

[0036] Depending on the weight and dimensions of the filters 5 being installed, the guide elements 3 can be made 5-20 mm thick and located at a distance of 0.25D-0.5D, where D is the diameter of the opening 2. It is possible to make a recess 8 in the guide element 7 for embedding the fixing element 4 of the cartridge filter in it. The device for fastening the cartridge filter operates as follows.

[0037] The fastening device is mounted in the housing 9 of the cartridge filter in such a way that a part of the rod with the eccentric lever 2 and the indicator 4 protrudes from the flange 10 of the housing 9, and the opposite part of the rod with the locking element protrudes from the other flange 11 of the housing 9. A sealing harness is installed on the flange 11, ensuring the sealing of the joint of the flange 11 with the support plate, namely with the base 5 of the support plate. Then, the eccentric lever 2 is brought to the vertical position ("open"), the filter is installed in the opening 6 (mounting place) of the support plate, determining the position of the locking element 3, visually checking it with the help of the indicator 4 and "aiming" the locking element 3 strictly parallel to the guides 7 of the opening 6 (mounting place), excluding the risk of damage to the element 3 on the guides 7.After inserting the locking element 3 between the guides, when the flange 11 is in full contact with the surface of the support plate (with the base 5), the filter housing 9 is rotated so that the locking element 3 is perpendicular to the guides 7 (guided by the position of the indicator 4, see Fig. 7). The eccentric lever 2 is moved to the closed position (to the horizontal position, as shown in Figs. 1 and 4). To prevent the lever 2 from being released accidentally, a locking mechanism can be installed, for example, in the form of a cotter pin 12 inserted into the holes in the lugs 13, between which the handle of the eccentric lever is placed. If it is necessary to dismantle the filter, the actions are performed in the reverse order.

[0038] An option is to mount the fastening device within the filter housing with rotation. In this case, installation of the filter into the mounting location can be simplified by allowing the rotation of rod 1 and, consequently, locking element 3, as it is guided between guides 7 of opening 6 (the mounting location).

[0039] To eliminate play at the point where the filter is connected to the support plate, the eccentric lever 2 can be made spring-loaded and / or the rod 1 can be equipped with a nut, the tightening of which allows the lever to be lowered on the rod, reducing the distance between the support point of the lever and the fixing element.

[0040] Thus, the claimed technical solution enables visual verification of the position (orientation) of the locking element during filter installation, thereby enabling simple and quick filter installation. Furthermore, sliding of the locking element of the filter's locking mechanism is eliminated, increasing its support area, thereby ensuring reliable and tight attachment of cartridge filters, as well as ease of installation and maintenance.

Claims

Formula 1. A cartridge filter comprising a housing, a rod, an eccentric lever pivotally connected to the end of the rod, and a locking element located at the opposite end of the rod perpendicular to its axis, characterized in that it is equipped with an indicator of the position of the locking element, rigidly mounted on the rod.

2. The filter according to item 1, characterized in that the fixing element is made in the form of a rod.

3. The filter according to item 1, characterized in that the position indicator is made in the form of a flag.

4. A device for fastening a cartridge filter, including a rod, an eccentric lever pivotally connected to the end of the rod, and a locking element located at the opposite end of the rod perpendicular to its axis, characterized in that it is equipped with an indicator of the position of the locking element, rigidly mounted on the rod.

5. The device according to paragraph 4, characterized in that the fixing element is made in the form of a rod.

6. The device according to item 4, characterized in that the position indicator is made in the form of a flag.

7. A plate for fastening cartridge filters, comprising a base with openings provided with two guide elements for the fixing element of the cartridge filter, installed parallel and at a distance from each other in the opening of the opening, characterized in that the guide elements are made in the form of shaped plates, each of which has an L-shaped profile, and the plates are installed in a mirror-symmetrical manner.

8. The plate according to item 7, characterized in that the plates are installed at a distance of 0.25D-0.5D, where D is the diameter of the hole.

9. The slab according to item 7, characterized in that the L-shaped profile is made with a recess in the inner corner.

10. The plate according to item 7, characterized in that the plates are made 5-20 mm thick.

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