An acid mist filtering device for SO3 gas

Abstract

The utility model discloses a kind of acid mist filtering devices for SO3 gas, including box, the bottom of the box is fixedly connected with several support legs, and the inner chamber bottom of the box is fixedly connected with caustic wash pool, the bottom of the caustic wash pool is equipped with drain pipe, the bottom end pipe orifice of the drain pipe is through the bottom of the box and extends to the below of the box, and drain valve is installed on the drain pipe, the both sides of the box are equipped with gas outlet, and the top of the box is installed with box cover, filter assembly is provided on the box cover. The utility model structure design is reasonable, can avoid that the acid liquid being captured on fiber bed layer is re-hauled by high-speed airflow and is taken away due to excessively high air speed, filtering effect is good, relevant filter component adopts detachable design, to carry out regular cleaning and replacement after long time use.

Description

Technical Field

[0001] This utility model belongs to the field of acid mist filtration technology, and in particular relates to an acid mist filtration device for SO3 gas. Background Technology

[0002] Sulfur trioxide (SO3) gas is often generated in industrial processes (especially in sulfuric acid production or the treatment of flue gas from the combustion of sulfur-containing substances). SO3 is a highly acidic and corrosive gas. When SO3 gas encounters water vapor (H2O) in the environment, it reacts rapidly to form sulfuric acid: SO3 + H2O → H2SO4. At lower temperatures (usually below the dew point), the newly generated sulfuric acid vapor condenses rapidly, forming extremely small droplets suspended in the gas. This suspended sulfuric acid aerosol is known as "sulfuric acid mist" or "acid mist." Both SO3 gas itself and the sulfuric acid mist it forms are highly corrosive, causing serious damage to downstream equipment (pipelines, fans, heat exchangers, chimneys, etc.) and forming acidic pollutants when released into the atmosphere. Therefore, it is necessary to remove these gases before they enter downstream equipment or are released into the atmosphere.

[0003] A search revealed a sulfuric acid mist filtration device for SO3 gas published on the Chinese Patent Network with publication number CN221964762U. This filtration device can be used for acid mist filtration of SO3 gas, but it has some defects and shortcomings that need to be improved: (1) The most commonly used acid mist filtration method is to use fiber beds or filter elements to capture acid mist droplets, which are then aggregated into larger droplets and flow downwards by gravity. However, due to the structural design of some existing acid mist filtration devices, the airflow containing acid mist is prone to excessively high velocity and local high-speed zones after being introduced into the filtration device, which causes the captured acid liquid to be re-entrained and carried away by the high-speed airflow; (2) Most existing acid mist filtration devices adopt an integrated design, and the fiber beds or filter elements are often fixed inside the device and difficult to disassemble. After long-term use, the fiber beds or filter elements are prone to failure due to acid corrosion, scale buildup, or mechanical fatigue. The non-disassembled structure requires the entire device to be replaced, which greatly increases the cost. Therefore, in view of the above problems, the acid mist filtration device for SO3 gas provided by this utility model is of great significance. Utility Model Content

[0004] This invention provides an acid mist filtration device for SO3 gas. The device filters SO3 acid mist using a filtration assembly and washes the acid mist droplets and gaseous SO3 in the airflow using an alkaline solution in an alkaline washing tank. During filtration, multiple diversion pipes divert the SO3-containing airflow entering the chamber and direct it to various collection ports to ensure sufficient contact between the acid mist and the fiber bed, thereby improving the filtration effect. The funnel-shaped diversion pipes effectively reduce the airflow velocity during diversion, preventing excessively high velocities that could cause the acid collected on the fiber bed to be re-entrained by the high-speed airflow. The detachable design allows the top plate, along with the air inlet, to be removed from the filter cartridge after prolonged use for regular cleaning of the air inlet and diversion pipes. Furthermore, the cover, along with the filter cartridge, can be removed from the chamber by unscrewing the nut for regular cleaning and replacement of the alkaline washing tank and fiber bed. In summary, this invention solves the problems in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model discloses an acid mist filtration device for SO3 gas, comprising a housing, several support legs fixedly connected to the bottom of the housing, an alkaline washing tank fixedly connected to the bottom of the inner cavity of the housing, a drain pipe opened at the bottom of the alkaline washing tank, the bottom end of the drain pipe penetrating through the bottom of the housing and extending to the lower part of the housing, and a drain valve installed on the drain pipe, air outlets opened on both sides of the housing, and a housing cover installed on the top of the housing, with a filter assembly installed on the housing cover;

[0007] The filter assembly includes a filter cylinder, which is fixedly connected to the bottom of the box cover. The filter cylinder wall has several collection ports, and each collection port is provided with a fiber bed. The top opening of the filter cylinder penetrates the box cover and is fitted with a top plate. A protrusion is fixedly connected to the bottom of the top plate, and an air inlet is opened on the top plate. The air inlet is cylindrical, and its bottom end penetrates the protrusion and extends to the bottom of the top plate. Several diversion pipes are opened on the side wall of the air inlet.

[0008] Furthermore, the filter cylinder is located directly above the alkaline washing tank, has a circular cross-section, and the bottom opening of the filter cylinder is trumpet-shaped and narrows inward.

[0009] Furthermore, the collection port is rectangular and is distributed in an equidistant ring along the circumference of the filter cylinder. The number of the diversion tubes is the same as the number of collection ports, and the center of each diversion tube corresponds one-to-one with the center of each collection port.

[0010] Furthermore, the diverter is funnel-shaped, with the diameter of the end near the air inlet being larger than the diameter of the end near the collection port.

[0011] Furthermore, an air guide chamber is fixedly connected to the outer wall of the filter cylinder. The air guide chamber is circular with a hollow interior and is connected to each collection port. Several air guide pipes are fixedly connected to the bottom of the air guide chamber. The air guide pipes are distributed in an equidistant ring along the circumference of the bottom surface of the air guide chamber. The top end of the pipes is connected to the air guide chamber, and the bottom end of the pipes extends into the alkaline washing tank.

[0012] Furthermore, the cross-section of the box body is rectangular, with the edge of the top opening protruding outward and having several positioning holes. The box cover is rectangular, with its length and width corresponding to the length and width of the box body, respectively. Several positioning rods are fixedly connected to the bottom of the box cover. The number of positioning rods is the same as the number of positioning holes, and their diameter corresponds to the diameter of the positioning holes. The center of each positioning rod corresponds one-to-one with the center of each positioning hole. Each positioning rod has an external thread and is threadedly connected to a nut that mates with it.

[0013] Furthermore, the cross-section of the protrusion is circular, and its diameter is equal to the inner diameter of the top of the filter cylinder. The top plate is circular, and its diameter is larger than that of the protrusion.

[0014] The present invention has the following advantages over the prior art:

[0015] (1) When using the acid mist filtration device for SO3 gas in this utility model, SO3 acid mist can be filtered through the filter components, and the acid mist droplets and gaseous SO3 in the airflow can be washed by the alkaline solution in the alkaline washing tank. During filtration, the airflow containing SO3 acid mist entering the box can be divided by multiple diversion pipes and introduced into each collection port to ensure that the acid mist can fully contact the fiber bed, thereby improving the filtration effect. When the airflow is divided, the funnel-shaped diversion pipe can effectively reduce the airflow velocity to avoid the high air velocity causing the acid liquid captured on the fiber bed to be re-wound and carried away by the high-speed airflow.

[0016] (2) When using the acid mist filtration device for SO3 gas in this utility model, the top plate and the air inlet can be removed from the filter cylinder after long-term use, so that the air inlet and the diversion pipe can be cleaned regularly. In addition, the cover can be removed from the box along with the filter cylinder by unscrewing the nut, so that the alkaline washing tank and the fiber bed can be cleaned and replaced regularly.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an acid mist filtration device for SO3 gas according to the present invention;

[0020] Figure 2 This is a front sectional view of an acid mist filtration device for SO3 gas according to the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the box in this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the tank cover and the alkaline washing tank in this utility model;

[0023] Figure 5 This is a schematic diagram of the filter cylinder in this utility model;

[0024] Figure 6 This is a schematic diagram of the air-guiding chamber in this utility model;

[0025] Figure 7 This is a schematic diagram of the top plate in this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Box body; 2. Support legs; 3. Alkali washing tank; 4. Drain pipe; 5. Drain valve; 6. Air outlet; 7. Box cover; 8. Filter cartridge; 9. Collection port; 10. Fiber bed; 11. Top plate; 12. Protrusion; 13. Air inlet; 14. Diverter pipe; 15. Air guide chamber; 16. Air guide pipe; 17. Positioning hole; 18. Positioning rod; 19. Nut. Detailed Implementation

[0028] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "relative", "one end", "inner", "lateral", "end", "both ends", "both sides", "front", "one end face", "the other end face", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Please see Figure 1-7 As shown, the present invention provides an acid mist filtration device for SO3 gas, comprising a housing 1, several support legs 2 fixedly connected to the bottom of the housing 1, and an alkaline washing tank 3 fixedly connected to the bottom of the inner cavity of the housing 1. The alkaline washing tank 3 is used to hold alkaline solutions (such as NaOH solutions). A drain pipe 4 is provided at the bottom of the alkaline washing tank 3. The bottom end of the drain pipe 4 passes through the bottom of the housing 1 and extends to the bottom of the housing 1. A drain valve 5 is installed on the drain pipe 4. Gas outlets 6 are provided on both sides of the housing 1. A housing cover 7 is installed on the top of the housing 1. A filter assembly is provided on the housing cover 7.

[0031] The filter assembly includes a filter cartridge 8, which is fixedly connected to the bottom of the housing cover 7. The cartridge wall has several collection ports 9, each containing a fiber bed 10. The fiber bed 10 can be made of polytetrafluoroethylene fiber, which has advantages such as acid resistance, strong hydrophobicity, and a smooth surface. The top opening of the filter cartridge 8 penetrates the housing cover 7 and is fitted with a top plate 11. A protrusion 12 is fixedly connected to the bottom of the top plate 11, and an air inlet 13 is provided on the top plate 11. The air inlet 13 is cylindrical, with its bottom end penetrating the protrusion 12 and extending to the bottom of the top plate 11. Several diversion pipes 14 are provided on the side wall of the air inlet 13. Airflow containing SO3 acid mist can be introduced into the housing 1 through the air inlet 13. Afterwards, the SO3 acid mist droplets in the airflow can be introduced into the filter cylinder 8 through each diversion pipe 14 and come into contact with the fiber bed 10 in each collection port 9. At this time, the SO3 acid mist droplets in the airflow can be captured on the surface of the fiber bed 10 until they gather into larger droplets. Then, they flow downwards by gravity and collect in the alkaline washing tank 3. The acid mist droplets can be washed by the alkaline solution in the alkaline washing tank 3 so that the acid mist can be removed by the collision and capture of the droplets, thereby achieving the filtration of SO3 acid mist. Afterwards, the filtered gas can be discharged from the box 1 through the air outlet 6. The air inlet 13, filter cylinder 8, and air outlet 6 are made of corrosion-resistant materials, such as Hastelloy C-276. After the filtration work is completed, the alkaline waste liquid can be discharged along the drain pipe 4 by opening the drain valve 5.

[0032] The filter cylinder 8 is located directly above the alkaline washing tank 3. Its cross-section is circular, and the bottom opening of the filter cylinder 8 is funnel-shaped and narrows inward. After the SO3 acid mist droplets are captured and aggregated into larger droplets, the downward flow of the droplets can be accelerated by the inclined inner wall at the bottom of the filter cylinder 8, thereby improving the efficiency of acid mist filtration. At the same time, it can also effectively prevent acid mist droplets from remaining on the inner wall of the filter cylinder 8.

[0033] The collection port 9 is rectangular and is distributed in an equidistant ring along the circumference of the filter cylinder 8. The number of diversion pipes 14 is the same as that of the collection ports 9, and the center of each diversion pipe 14 corresponds one-to-one with the center of each collection port 9. The airflow containing SO3 acid mist entering the box 1 can be diverted through multiple diversion pipes 14 and introduced into each collection port 9 respectively, so as to ensure that the acid mist can fully contact the fiber bed 10, thereby improving the filtration effect.

[0034] The diversion pipe 14 is funnel-shaped, with the diameter of the end near the air inlet 13 being larger than the diameter of the end near the collection port 9. When diverting the airflow, the funnel-shaped diversion pipe 14 can effectively reduce the airflow velocity to avoid the high air velocity causing the acid liquid collected on the fiber bed 10 to be re-swept away by the high-speed airflow.

[0035] The filter cylinder 8 has an air guide chamber 15 fixedly connected to its outer wall. The air guide chamber 15 is circular with a hollow interior and is connected to each collection port 9. Several air guide pipes 16 are fixedly connected to the bottom of the air guide chamber 15. The air guide pipes 16 are distributed in an equidistant ring along the circumference of the bottom surface of the air guide chamber 15. The top end of the pipes 16 is connected to the air guide chamber 15, and the bottom end of the pipes 16 extends into the alkaline washing tank 3. The airflow filtered by the fiber bed 10 can enter the air guide chamber 15 and be guided into the alkaline washing tank 3 through each air guide pipe 16. After the airflow comes into contact with the alkaline solution in the alkaline washing tank 3, the airflow can be washed by the alkaline solution in order to absorb gaseous SO3 (to generate sulfate). The alkaline washing tank 3, the air guide chamber 15, and the air guide pipes 16 are all made of corrosion-resistant materials, such as nickel 200 / 201.

[0036] The box body 1 has a rectangular cross-section, with its top opening protruding outwards and having several positioning holes 17. The box cover 7 is rectangular, with its length and width corresponding to the length and width of the box body 1, respectively. Several positioning rods 18 are fixedly connected to the bottom of the box cover 7. The number of positioning rods 18 is the same as the number of positioning holes 17, and their diameters correspond to the diameters of the positioning holes 17. The center of each positioning rod 18 corresponds one-to-one with the center of each positioning hole 17. Each positioning rod 18 has an external thread and is threaded. There is a nut 19 that matches it. When the box cover 7 is placed on the top of the box body 1, each positioning rod 18 can be aligned and pass through the corresponding positioning hole 17. At this time, the nut 19 is threaded onto each positioning rod 18 and tightened. The box cover 7 can be fixed by the mutual cooperation between the positioning rod 18, the positioning hole 17, and the nut 19 to prevent the box cover 7 from making gaps due to loosening. By unscrewing the nut 19, the box cover 7 and the filter cylinder 8 can be taken out of the box body 1 together for regular cleaning and replacement of the alkaline washing tank 3 and the fiber bed 10.

[0037] The protrusion 12 has a circular cross-section, and its diameter is equal to the inner diameter of the top of the filter cylinder 8. The top plate 11 is circular, and its diameter is larger than that of the protrusion 12. When the top plate 11 is placed on the cover 7, the protrusion 12 can be inserted into and fit against the inner wall of the filter cylinder 8. At this time, the protrusion 12 can position and seal the top plate 11 to prevent the top plate 11 from becoming loose or having gaps. After long-term use, the top plate 11 can be removed from the filter cylinder 8 together with the air inlet 13 so that the air inlet 13 and the split pipe 14 can be cleaned regularly.

[0038] All standard parts used in the application documents can be purchased from the market. All components in this application documents can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art.

[0039] The working principle of this utility model is as follows:

[0040] In use, this invention allows airflow containing SO3 acid mist to be introduced into the housing 1 through the air inlet 13. After entering the air inlet 13, the airflow is guided through various diversion pipes 14 into the filter cartridge 8 and comes into contact with the fiber bed 10 in each collection port 9. At this time, SO3 acid mist droplets in the airflow can be captured on the surface of the fiber bed 10 until they aggregate into larger droplets, which then flow downwards by gravity and collect in the alkaline washing tank 3. The alkaline solution in the alkaline washing tank 3 can wash the acid mist droplets, thereby removing the acid mist through droplet collision and capture, thus achieving the filtration of SO3 acid mist. The airflow containing SO3 acid mist entering the housing 1 can be diverted through multiple diversion pipes 14 and introduced into each collection port 9 to ensure that the acid mist can fully contact the fiber bed 10, thereby improving the filtration effect. When diverting the airflow, a funnel is used. The shaped diversion pipe 14 can effectively reduce the airflow velocity to avoid the acid liquid captured on the fiber bed 10 being re-entrained and carried away by the high-speed airflow due to excessive air velocity. The airflow after being filtered by the fiber bed 10 can enter the air guide chamber 15 and be guided into the alkaline washing tank 3 through each air guide pipe 16. After the airflow comes into contact with the alkaline solution in the alkaline washing tank 3, the alkaline solution can be used to wash the airflow in order to absorb gaseous SO3 (to generate sulfate). Then, the filtered gas can be discharged from the box 1 through the air outlet 6. After long-term use, the top plate 11 and the air inlet 13 can be removed from the filter cylinder 8 together for regular cleaning of the air inlet 13 and the diversion pipe 14. In addition, the box cover 7 and the filter cylinder 8 can be removed from the box 1 together by unscrewing the nut 19 for regular cleaning and replacement of the alkaline washing tank 3 and the fiber bed 10.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An acid mist filtration device for SO3 gas, characterized in that, The device includes a housing, with several support legs fixedly connected to the bottom of the housing. An alkaline washing tank is fixedly connected to the bottom of the inner cavity of the housing. A drain pipe is provided at the bottom of the alkaline washing tank. The bottom end of the drain pipe passes through the bottom of the housing and extends to the lower part of the housing. A drain valve is installed on the drain pipe. Air outlets are provided on both sides of the housing. A housing cover is installed on the top of the housing. A filter assembly is provided on the housing cover. The filter assembly includes a filter cylinder, which is fixedly connected to the bottom of the box cover. The filter cylinder wall has several collection ports, and each collection port is provided with a fiber bed. The top opening of the filter cylinder penetrates the box cover and is fitted with a top plate. A protrusion is fixedly connected to the bottom of the top plate, and an air inlet is opened on the top plate. The air inlet is cylindrical, and its bottom end penetrates the protrusion and extends to the bottom of the top plate. Several diversion pipes are opened on the side wall of the air inlet.

2. The acid mist filtration device for SO3 gas according to claim 1, characterized in that, The filter cylinder is located directly above the alkaline washing tank. Its cross-section is circular, and the bottom opening of the filter cylinder is trumpet-shaped and narrows inward.

3. The acid mist filtration device for SO3 gas according to claim 1, characterized in that, The collection port is rectangular and is distributed in an equidistant ring along the circumference of the filter cylinder. The number of the diversion tubes is the same as the number of collection ports, and the center of each diversion tube corresponds one-to-one with the center of each collection port.

4. The acid mist filtration device for SO3 gas according to claim 1, characterized in that, The diverter is funnel-shaped, with the diameter of the end near the air inlet being larger than the diameter of the end near the collection port.

5. An acid mist filtration device for SO3 gas according to claim 1, characterized in that, The outer wall of the filter cylinder is fixedly connected to an air guide chamber. The air guide chamber is circular and hollow inside, and is connected to each collection port. Several air guide pipes are fixedly connected to the bottom of the air guide chamber. The air guide pipes are distributed in an equidistant ring along the circumference of the bottom surface of the air guide chamber. The top end of the pipe is connected to the air guide chamber, and the bottom end of the pipe extends into the alkaline washing tank.

6. The acid mist filtration device for SO3 gas according to claim 1, characterized in that, The box body has a rectangular cross-section, with its top opening protruding outwards and having several positioning holes. The box cover is rectangular, with its length and width corresponding to the length and width of the box body, respectively. Several positioning rods are fixedly connected to the bottom of the box cover. The number of positioning rods is the same as the number of positioning holes, and their diameter corresponds to the diameter of the positioning holes. The center of each positioning rod corresponds one-to-one with the center of each positioning hole. Each positioning rod has an external thread and is threaded with a nut that mates with it.

7. An acid mist filtration device for SO3 gas according to claim 1, characterized in that, The protrusion has a circular cross-section, and its diameter is equal to the inner diameter of the top of the filter cylinder. The top plate is circular, and its diameter is larger than that of the protrusion.

Images