A wet-process phosphoric acid filtration system

Abstract

This application discloses a wet-process phosphoric acid filtration system, comprising: a mesh structure, a collection shed, a distributor, an air inlet, several support columns, a main exhaust duct, a fiberglass pipe, a filter fan, a slurry distributor, and a flushing plate area. The support columns are mounted on the mesh structure, and the distributor, the main exhaust duct, the fiberglass pipe, the filter fan, the slurry distributor, and the flushing plate area are mounted on the mesh and the support columns. The collection shed extends from the slurry distributor to the distributor. The air inlet is located at the top of the collection shed and the flushing plate area. The air inlet of the collection shed is connected to the filter fan via the main exhaust duct. The air inlet of the flushing plate area is connected to the main exhaust duct via the fiberglass pipe. The collection shed covers the distributor area, and by providing dual air inlets, it effectively collects acidic water vapor, preventing corrosion of the equipment by acidic water vapor and extending the equipment's service life.

Description

Technical Field

[0001] This application relates to the field of filtration, and more particularly to a wet phosphoric acid filtration system. Background Technology

[0002] In the phosphoric acid production process, the filter's main function is to separate the slurry at approximately 83°C and effectively wash the filter cake using filter cake wash water at around 70°C. However, this filter has significant problems during operation. Due to the high temperature of the slurry and wash water, a large amount of acidic water vapor is generated during filtration, causing the filter vapor to permeate the air, severely obstructing the operator's vision and greatly increasing the risk of accidents such as slipping, falling, and colliding with equipment, posing a direct threat to safe production.

[0003] Meanwhile, these acidic water vapors contain small amounts of fluoride. Prolonged exposure to this working environment and inhalation of fluoride-containing water vapor can pose potential health hazards, such as respiratory illnesses and fluorosis. Furthermore, the acidic water droplets formed after condensation adhere to equipment surfaces, reacting chemically with the metal materials of the equipment, accelerating corrosion, shortening equipment lifespan, increasing maintenance costs and replacement frequency, thus affecting the continuity and stability of production and increasing the company's production costs. Utility Model Content

[0004] This application provides a wet phosphoric acid filtration system, including: a mesh structure, a collection shed, a distributor, an air inlet, several support columns, a main exhaust duct, a fiberglass pipe, a filter fan, a slurry distributor, and a flushing area;

[0005] The support columns are arranged on the mesh structure, and the distributor, the main exhaust pipe, the fiberglass pipe, the air filter, the slurry distributor, and the flushing plate area are arranged on the mesh and the support columns.

[0006] The collection shed extends from the slurry distributor to the distributor;

[0007] The air inlet is provided on the top of the collection shed and the top of the impeller area;

[0008] The air inlet of the collection shed is connected to the filter fan through the main exhaust pipe;

[0009] The air intake inlet of the impact plate area is connected to the main exhaust pipe through the fiberglass pipe.

[0010] Optionally, a PP sheet with a thickness of 10mm is laid on the mesh structure, and the PP sheet is fixed to the mesh structure by bolts.

[0011] Optionally, the flue gas collection shed further includes a discharge screw and a protective cover; the discharge screw is used for discharging material; the protective cover is disposed between the filter plate area and the discharge screw.

[0012] Optionally, a DN200 fiberglass pipe branch is provided at the protective cover between the filter plate area and the unloading screw, and the branch is connected to the main exhaust pipe.

[0013] Optionally, the edge of the collection shed is provided with a transparent flexible curtain, the curtain being made of PVC material;

[0014] The curtain is fixed to the outside of the mesh structure with 316L stainless steel bolts.

[0015] Optionally, the mesh structure is made of 316L stainless steel tubing.

[0016] Optionally, the support column is connected to the mesh structure by welding or bolting.

[0017] Optionally, the protective cover is provided with reinforcing ribs inside, and the protective cover is connected to the DN200 fiberglass pipe branch via a flange, with a sealing strip provided at the connection.

[0018] Optionally, the main exhaust duct is connected to the fiberglass pipe via a flange, and a sealing ring is provided at the connection interface between the main exhaust duct and the fiberglass pipe.

[0019] Optionally, the mesh structure, the distributor, the support column, the main exhaust duct, the fiberglass pipe, the filter fan, and the slurry distributor are coated with a protective coating.

[0020] As can be seen from the above technical solutions, this application has the following advantages:

[0021] The collection shed extends from the slurry distributor to the distributor itself, covering the core area of ​​the filter. Combined with the air inlets at the top of the collection shed and the top of the flushing plate area, it forms a comprehensive, all-around collection system for acidic water vapor generated by the distributor and flushing plate area, preventing water vapor leakage. Support columns, the mesh structure, and other components work closely together. The support columns provide stable support for the mesh structure, while the mesh structure provides the installation foundation for the distributor, main exhaust duct, etc. The components are clearly layered and rationally arranged, making the entire collection shed structure compact and stable. The air inlets of the collection shed are connected to the filter fan via the main exhaust duct, and the air inlets in the flushing plate area are connected to the main exhaust duct via fiberglass pipes. Fiberglass pipes are used as the conveying pipelines because of their resistance to acid and alkali corrosion, effectively resisting acidic water vapor erosion and extending the service life of the pipelines. Attached Figure Description

[0022] Figure 1 This is a plan view of a wet phosphoric acid filtration system. Detailed Implementation

[0023] To address the aforementioned technical issues, this application provides a wet phosphoric acid filtration system to solve the problem of acidic water vapor pollution during the filtration process in phosphoric acid production, thereby achieving efficient solid-liquid separation, pollutant collection and treatment, and optimization of the production environment.

[0024] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0025] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0026] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0027] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0028] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] This application provides an embodiment of a wet phosphoric acid filtration system; please refer to [link / reference]. Figure 1 , Figure 1 This is a plan view of a wet phosphoric acid filtration system. This embodiment includes: a mesh structure 1, a collection shed 3, a distributor 2, an air inlet, several support columns 4, a main exhaust duct 5, a fiberglass pipe 6, a filter fan 7, a slurry distributor 8, and a flushing area 9.

[0030] Support column 4 is set on mesh structure 1, distributor 2, main exhaust pipe 5, fiberglass pipe 6, air filter, slurry distributor 8 and impingement plate area 9 are set on mesh structure 1 and support column 4;

[0031] Collection shed 3 extends from slurry distributor 8 to distributor 2;

[0032] Air inlets are provided on the top of the collection shed 3 and the flushing plate area 9;

[0033] The air inlet of the collection shed 3 is connected to the filter fan 7 through the main exhaust pipe 5;

[0034] The air intake of the stamping plate area 9 is connected to the main exhaust pipe 5 through the fiberglass pipe 6.

[0035] The support column 4 is connected to the mesh structure 1 by welding to form a support frame. A 10mm thick PP board 10 is laid on top of the support frame. The distributor 2 includes a first-wash distributor 201, a second-wash distributor 202, and a third-wash distributor 203. The collection shed 3 extends from the slurry distributor 8 to the third-wash distributor 203. A large amount of acidic water vapor containing fluoride, sulfuric acid, etc., will be generated in the area from the first-wash distributor 201 to the third-wash distributor 203. Extending the collection shed 3 to the third-wash distributor 203 will better collect the acidic water vapor. The top of the collection shed 3 and the flushing area 9 are equipped with air inlets. The air inlets of the collection shed 3 are connected to the filter fan 7 through the main exhaust pipe 5, and the air inlets of the flushing area 9 are connected to the main exhaust pipe 5 through the fiberglass pipe 6. An air collection port is installed at the top of the collection shed 3 to directly collect the acidic water vapor generated during the first wash distributor 201 to the third wash distributor 203 of the filter. Meanwhile, the flushing plate area 9, as a key area prone to water vapor generation, has an independent air collection port to specifically capture the water vapor in this area. Together, the two form a complete coverage collection of the main steam-generating areas of the filter, avoiding water vapor leakage caused by the lack of local collection.

[0036] Working Principle: A stable negative pressure environment is created within the collection shed 3 by a newly added induced draft fan. This allows acidic water vapor containing fluoride and sulfuric acid, generated in the first to third wash zones of the phosphoric acid filter and the flushing zone 9, to be collected through the air inlets at the top of the collection shed and into the main induced draft duct 5 via fiberglass pipe 6, respectively. The slurry distributor 8 works in conjunction with the multi-stage washing distributor 2. After initial distribution, the slurry is sequentially sprayed and washed through the first wash distributor 201, the second wash distributor 202, and the third wash distributor 203, with the acidic water vapor generated during the process being collected in real time. The mixed gas in the main induced draft duct 5 is pressurized by the induced draft fan and then transported to the filter fan 7, finally entering the tail gas washing section for multi-stage alkaline spray treatment, reducing the concentration of pollutants such as fluoride and sulfuric acid mist to below the standard before emission. Throughout the process, the corrosion-resistant and enclosed system, consisting of a 316L stainless steel mesh structure, a PP board covering layer, and PVC curtains, works in conjunction with a 6-way fiberglass pipe system to ensure efficient and leak-free collection of acidic water vapor, achieving the dual goals of environmental protection and equipment protection.

[0037] In this embodiment, the collection shed 3 extends from the slurry distributor 8 to the distributor 2, covering the core area of ​​the filter. Combined with the air inlet at the top of the collection shed 3 and the air inlet at the top of the flushing plate area 9, it forms a comprehensive, all-around collection system for acidic water vapor generated by the distributor 2 and the flushing plate area 9, preventing water vapor leakage. The support column 4, the mesh structure 1, and other components work closely together. The support column 4 provides stable support for the mesh structure 1, and the mesh structure 1 provides an installation foundation for the distributor 2, the main exhaust pipe 5, etc. The components are clearly layered and rationally arranged, making the entire collection shed 3 structure compact and stable. The air inlet of the collection shed 3 is connected to the filter fan 7 through the main exhaust pipe 5, and the air inlet of the flushing plate area 9 is connected to the main exhaust pipe 5 through a fiberglass pipe 6. The fiberglass pipe 6 is selected as the conveying pipeline, utilizing its acid and alkali corrosion resistance to effectively resist acidic water vapor erosion and extend the service life of the pipeline.

[0038] In an optional embodiment, a PP board 10 with a thickness of 10mm is laid on the mesh structure 1, and the PP board 10 is fixed to the mesh structure 1 by bolts.

[0039] In this embodiment, a PP board 10 with a thickness of 10mm is fixed on the surface of the mesh structure 1, sealing the surface gaps of the mesh structure 1 and preventing acidic water vapor from penetrating into the mesh structure 1, effectively preventing the corrosion of acidic water vapor and extending the service life of the mesh structure 1.

[0040] In an optional embodiment, the flue gas collection shed 3 further includes a discharge screw 11 and a protective cover 12; the discharge screw 11 is used for discharging material; the protective cover 12 is disposed between the filter press plate area 9 and the discharge screw 11.

[0041] In an optional embodiment, a fiberglass pipe 6 branch is provided at the protective cover 12 between the filter press plate area 9 and the unloading screw 11, and the fiberglass pipe 6 branch is connected to the main exhaust pipe 5.

[0042] In the above optional embodiments, the unloading screw 11 is prone to generating acidic water vapor and material splashing during the unloading process. The protective cover 12 is set between the impact plate area 9 and the unloading screw 11 to effectively isolate the acidic water vapor and splashing material generated during the unloading process. Together with the air collection port at the top of the impact plate area 9 and the branch of the fiberglass pipe 6, a dual protection mechanism of "closed interception + directional collection" is formed, so that the acidic water vapor in this area can be effectively collected, thereby reducing the water vapor from escaping into the workshop environment.

[0043] In an optional embodiment, a transparent flexible curtain is provided at the edge of the collection shed 3, and the curtain is made of PVC material;

[0044] The curtain is fixed to the outside of the mesh structure 1 with 316L stainless steel bolts.

[0045] In this embodiment, the PVC transparent flexible curtain has good flexibility and, after installation, can fit tightly against the edge of the collection shed 3 to form a continuous sealed structure, effectively preventing acidic moisture from escaping from the collection shed 3. It is fixed with 316L stainless steel bolts, which are not prone to rusting or breaking in humid and acidic environments, ensuring a stable installation of the curtain.

[0046] In an optional embodiment, the mesh structure 1 is made of 316L stainless steel tubing.

[0047] In an optional embodiment, the support column 4 is connected to the mesh structure 1 by welding or bolting.

[0048] In the above optional embodiments, the 316L stainless steel pipe has high strength and rigidity, and can withstand the load of the top PP plate 10, PVC curtain and other components. The support column 4 and the mesh structure 1 are seamlessly integrated by welding or bolting, which effectively supports other components and improves the stability of the flue gas collection shed 3.

[0049] In an optional embodiment, the protective cover 12 is provided with reinforcing ribs inside, and the protective cover 12 is connected to the DN200 fiberglass pipe 6 branch via a flange, with a sealing strip provided at the connection.

[0050] In this embodiment, reinforcing ribs are provided inside the protective cover 12, which can effectively enhance the overall rigidity and pressure resistance of the protective cover 12. Under the impact force and vibration generated by the unloading screw 11 and the impact plate area 9, as well as the negative pressure generated by the operation of the fan, the reinforcing ribs can prevent the protective cover 12 from deforming, denting, or even cracking, and continuously and effectively block material splashing and acidic water vapor diffusion. The protective cover 12 is connected to the fiberglass pipe 6 branch by flange connection, which facilitates the inspection, cleaning, and replacement of the protective cover 12 or the pipe, and improves maintenance efficiency. A sealing strip is provided at the connection, which can fill the tiny gaps of the flange connection surface and form a tight sealing barrier. Even under negative pressure environment and acidic water vapor corrosion, the sealing strip can still maintain good elasticity and sealing performance, effectively preventing acidic water vapor from leaking from the connection.

[0051] In an optional embodiment, the main exhaust duct 5 is connected to the fiberglass pipe 6 via a flange, and a sealing ring is provided at the connection interface between the main exhaust duct 5 and the fiberglass pipe 6.

[0052] In this embodiment, the sealing ring effectively fills the tiny gap between the flange connection surfaces of the main exhaust duct 5 and the fiberglass pipe 6, forming a tight sealing structure. Under the negative pressure environment generated by the fan operation, it prevents acidic water vapor from leaking from the connection point.

[0053] In an optional embodiment, the mesh structure 1, distributor 2, support column 4, main air duct 5, fiberglass pipe 6, filter fan 7, and slurry distributor 8 are coated with a protective coating.

[0054] In this embodiment, by coating the surfaces of components such as the mesh structure 1, distributor 2, and support column 4 with a protective coating, a dense chemical barrier is formed, which can effectively resist the corrosion of strong acidic water vapors such as fluorides and sulfuric acid in phosphoric acid production, and effectively improve the service life of the equipment.

[0055] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wet-process phosphoric acid filtration system characterized by, include: The structure includes a mesh structure, a collection shed, a distributor, an air inlet, several support columns, a main exhaust duct, a fiberglass pipe, a filter fan, a slurry distributor, and a flushing area. The support columns are arranged on the mesh structure, and the distributor, the main exhaust pipe, the fiberglass pipe, the air filter, the slurry distributor, and the flushing plate area are arranged on the mesh and the support columns. The collection shed extends from the slurry distributor to the distributor; The air inlet is provided on the top of the collection shed and the top of the impeller area; The air inlet of the collection shed is connected to the filter fan through the main exhaust pipe; The air intake inlet of the impact plate area is connected to the main exhaust pipe through the fiberglass pipe.

2. The wet-process phosphoric acid filtration system of claim 1, wherein, A 10mm thick PP sheet is laid on the mesh structure, and the PP sheet is fixed to the mesh structure with bolts.

3. The wet-process phosphoric acid filtration system of claim 1, wherein, The flue gas collection shed also includes a discharge screw and a protective cover; The unloading screw is used for unloading; The protective cover is installed between the filter press platen area and the unloading screw.

4. The wet-process phosphoric acid filtration system of claim 1, wherein, A DN200 fiberglass pipe branch is installed at the protective cover between the filter press plate area and the unloading screw, and the branch is connected to the main exhaust pipe.

5. The wet phosphoric acid filtration system according to claim 1, characterized in that, The edge of the collection shed is fitted with a transparent soft panel curtain, the curtain being made of PVC material; The curtain is fixed to the outside of the mesh structure with 316L stainless steel bolts.

6. The wet-process phosphoric acid filtration system of claim 1, wherein, The mesh structure is made of 316L stainless steel pipe.

7. The wet-process phosphoric acid filtration system of claim 1, wherein, The support columns are connected to the mesh structure by welding or bolting.

8. The wet-process phosphoric acid filtration system of claim 1, wherein, The protective cover is equipped with reinforcing ribs inside, and the protective cover is connected to the DN200 fiberglass pipe branch via a flange, with a sealing strip installed at the connection.

9. The wet-process phosphoric acid filtration system of claim 1, wherein, The main exhaust duct is connected to the fiberglass pipe via a flange, and a sealing ring is provided at the connection interface between the main exhaust duct and the fiberglass pipe.

10. The wet-process phosphoric acid filtration system according to any one of claims 1 to 9, characterized in that, The mesh structure, the distributor, the support column, the main exhaust duct, the fiberglass pipe, the filter fan, and the slurry distributor are all coated with a protective coating.

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