Steel lining PTFE storage tank

Abstract

The utility model relates to a steel lining PTFE storage tank which comprises a storage tank body, the storage tank body is composed of a tank top, a tank wall and a tank bottom plate, the storage tank body comprises a steel shell layer, a steel shell surface mucilage glue layer, a PTFE plate surface mucilage glue layer and a lining plastic layer, and the steel shell layer and the lining plastic layer are the outer wall and the inner wall of the storage tank body respectively. And the steel shell surface adhesive layer is adhered to the polytetrafluoroethylene plate surface adhesive layer. The plastic lining layer is formed by splicing a plurality of polytetrafluoroethylene sodium plates, a V-shaped groove is formed in the splicing position of the polytetrafluoroethylene sodium plates, the PFA round welding rod filling layer is arranged in the V-shaped groove, and the PFA wide welding strip covering layer is arranged at the opening part of the top of the V-shaped groove. The PTFE plate and the inner surface of the steel part are tightly bonded, no gap exists between the plastic lining layer and the steel shell layer, a complete lining structure is formed through hot melting welding, the lining layer is smooth and flat, uniform in texture, free of cracks, warping, holes, unshelling and bulging, and capable of storing and transporting highly corrosive materials for a long time at high temperature and high pressure.

Description

Technical Field

[0001] The utility model relates to a steel-lined PTFE storage tank, belonging to the technical field of chemical anti-corrosion equipment. Background Art

[0002] At present, the common anti-corrosion materials in China include rubber sheet, fiberglass, polyethylene, polytetrafluoroethylene, etc. Among them, polytetrafluoroethylene has the most stable chemical properties. Polytetrafluoroethylene is referred to as PTFE. It is white in appearance, non-toxic, hygienic, non-fouling, non-microbial, heat-resistant and cold-resistant. It can be used for a long time at -180 to 260 ° C. It has extremely strong corrosion resistance. It can withstand almost any concentration of acid, alkali, and strong oxidizing media. It is almost insoluble in all solvents and has strong hydrophobicity. Neither water nor water-containing substances will wet polytetrafluoroethylene. The chemical corrosion resistance exceeds that of most existing engineering plastics, and it has irreplaceable advantages in terms of comprehensive performance such as cost performance. Metal materials have high rigidity, strength and other mechanical properties, while polytetrafluoroethylene has excellent engineering properties such as corrosion resistance, anti-adhesion, and friction reduction. The organic combination of metal steel storage tanks and lining materials with stable chemical properties is an ideal container for storing and transporting various highly corrosive and active substances.

[0003] Most traditional steel-lined PTFE storage tanks use an empty sleeve lining, that is, a PTFE inner sleeve is made according to the inner diameter of the equipment, and the empty sleeve is placed inside the steel part, which can not only meet the requirements of anti-corrosion storage and transportation, but also ensure the strength of the equipment. However, this process also has its limitations. Polytetrafluoroethylene itself does not have adhesion, has poor activity and high stability, and is often used as a non-stick coating. It is very difficult to bond untreated PTFE sheets directly to metals. There will be a gap of 1-2mm between the tank body and the sleeve, forming a natural air interlayer. Under high temperature and low negative pressure conditions, the air in the interlayer will suddenly expand due to heat, causing the PTFE lining layer to peel, tear or bulge. At the same time, the joint treatment between PTFE sheets is also a major problem, and most leaks occur at the joints. Utility Model Content

[0004] The utility model aims to provide a steel-lined PTFE storage tank with a compact inner lining and strong integrity.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A steel-lined PTFE storage tank comprises a storage tank body, which is composed of a tank top, a tank wall and a tank bottom plate. The storage tank body comprises a steel shell layer, an adhesive layer on the surface of the steel shell, an adhesive layer on the surface of a polytetrafluoroethylene plate and a plastic lining layer. The steel shell layer and the plastic lining layer are respectively the outer wall and the inner wall of the storage tank body. The adhesive layer on the surface of the steel shell is arranged on the inner side of the steel shell layer, the adhesive layer on the surface of the polytetrafluoroethylene plate is arranged on the inner side of the plastic lining layer, and the adhesive layer on the surface of the steel shell and the adhesive layer on the surface of the polytetrafluoroethylene plate are bonded to each other.

[0007] Furthermore, the plastic lining layer is formed by splicing a plurality of sodium polytetrafluoroethylene plates.

[0008] Furthermore, a V-shaped groove is formed at the joint of the sodium polytetrafluoroethylene plates, a PFA round welding rod filling layer is arranged in the V-shaped groove, and a PFA wide welding strip cover layer is arranged at the top opening of the V-shaped groove.

[0009] Furthermore, the storage tank body is provided with a plurality of equipment pipe openings, a polytetrafluoroethylene tube is installed inside the equipment pipe opening, and the inner end of the polytetrafluoroethylene tube is connected to the plastic lining layer as a whole.

[0010] Furthermore, a straight ladder with a protective cage is arranged on one side of the tank wall.

[0011] Furthermore, a lifting lug a and a lifting lug b are respectively provided on both sides of the top of the tank wall.

[0012] Furthermore, a tank wall reinforcement ring is welded to the tank wall.

[0013] Furthermore, the tank top is welded with tank top reinforcement ribs.

[0014] Furthermore, a platform fence is provided on the tank top.

[0015] Furthermore, a light-transmitting hole is provided on the top of the tank.

[0016] According to the technical solution provided by the utility model, the PTFE plate is tightly bonded to the inner surface of the steel part, and there is no gap between the lining plastic layer and the steel shell layer. In addition, the PTFE plates are hot-melt welded to form a complete lining structure. The inner lining layer is smooth and flat, with uniform texture, no cracks, no warping, no holes, no shelling, and no bulging, and can store and transport highly corrosive materials for a long time under high temperature and high pressure.

[0017] The utility model steel-lined PTFE storage tank combines the mechanical strength of metal and the corrosion resistance, aging resistance and scaling resistance of polytetrafluoroethylene. It has a reasonable structure, stable performance, safety and reliability, easy production, strong operability, environmental protection and durability. It is an ideal container for long-term storage and transportation of various highly corrosive and active substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are used to provide further description of the present invention and constitute a part of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model steel-lined PTFE storage tank;

[0020] Figure 2 yes Figure 1 The I-I sectional view is the bottom structure diagram of the steel lined PTFE storage tank;

[0021] Figure 3 It is a partial enlarged view of the bottom ring and top ring baffle plate of the steel-lined PTFE storage tank of the utility model.

[0022] In the figure, 1-straight ladder, 2-lifting ear a, 3-top ring baffle plate, 4-tank top platform fence, 5-feeding port, 6-liquid level gauge port a, 7-exhaust pressure relief port, 8-tank top, 9-tank top reinforcement rib, 10-light transmission hole, 11-lifting ear b, 12-overflow port, 13-tank wall, 14-tank wall reinforcement ring, 15-thermometer port, 16-drain port, 17-tank bottom, 18-discharge port, 19-manhole, 20-sampling port, 21-liquid level gauge port b, 22-bottom ring baffle plate, 23-anchor bolt seat, 24-steel shell layer, 25-steel shell surface adhesive layer, 26-PTFE plate surface adhesive layer, 27-plastic lining layer, 28-PFA round welding rod filling layer, 29-PFA wide welding strip cover layer. DETAILED DESCRIPTION

[0023] A typical embodiment of the utility model provides a steel-lined PTFE storage tank, such as Figure 1 As shown, it includes a tank body and various functional nozzles and accessories, wherein the tank body is composed of a tank top 8, a tank wall 13 and a tank bottom 17. The functional nozzles include a feed port 5, a discharge port 18, a drain port 16, a liquid level gauge port 6, a manhole 19, etc.

[0024] The concept of the utility model is to closely bond the PTFE plate to the inner surface of the steel part so that there is no gap between the lining plastic layer and the steel shell layer. In addition, the PTFE plates are welded by hot melt to form a complete lining structure.

[0025] Based on the above conception, the tank body in this embodiment, that is, the tank top 8, the tank wall 13 and the tank bottom 17 all include a steel shell layer 24, an adhesive layer 25 on the surface of the steel shell, an adhesive layer 26 on the surface of the polytetrafluoroethylene plate and a plastic lining layer 27. The steel shell layer 24 and the plastic lining layer 27 are respectively the outer wall and the inner wall of the tank body. The adhesive layer 25 on the surface of the steel shell is arranged on the inner side of the steel shell layer 24, the adhesive layer 26 on the surface of the polytetrafluoroethylene plate is arranged on the inner side of the plastic lining layer 27, and the adhesive layer 25 on the surface of the steel shell and the adhesive layer 26 on the surface of the polytetrafluoroethylene plate are bonded to each other. Figure 2 Only the structure of the tank bottom 17 is shown, and the structures of the tank top 8 and the tank wall 13 are the same.

[0026] In this embodiment, the material of the storage tank body is Q345R, and the inner lining is PTFE plate. PTFE is called polytetrafluoroethylene, commonly known as "plastic king", which is one of the most corrosion-resistant substances in the world today and an excellent material for manufacturing chemical anti-corrosion equipment. Polytetrafluoroethylene is white in appearance, non-toxic, hygienic, non-fouling, non-breeding microorganisms, heat-resistant and cold-resistant, and can be used for a long time at -180 to 260 ° C. It has extremely strong corrosion resistance and can withstand any concentration of acid, alkali, and strong oxidizing media. It is almost insoluble in all solvents and has strong hydrophobicity. The chemical formula of polytetrafluoroethylene is (C2F4)n, which is a polymer compound composed of carbon and fluorine. Since the carbon-carbon bond in the polytetrafluoroethylene molecule is tightly surrounded by the fluorine ions in the outer layer, polytetrafluoroethylene has high stability and non-stickiness. The PTFE plate of the required inner lining is treated with single-sided sodium to activate its surface, and the fluorine ions on the surface are activated into metal ions to enhance the polarity and surface tension of the PTFE plate, so that it can be tightly bonded to metals, non-metals and other plastics.

[0027] The bonding strength of the surface of the PTFE plate after sodium treatment is greatly improved. It can be firmly bonded to the inner surface of the steel part through a special hard glue. The other side of the PTFE plate is not treated, and the stable physical and chemical properties of polytetrafluoroethylene are still maintained to ensure effective and long-term storage of materials and extend the service life of the equipment.

[0028] In this embodiment, the lining plastic layer 27 is made of a PTFE plate that has been treated with sodium on one side. The surface of the activated PTFE plate has high bonding strength and can be firmly attached to the inner surface of the steel part. The other side is not treated and still maintains the stable physical and chemical properties of polytetrafluoroethylene to ensure effective and long-term storage of materials and extend the service life of the equipment.

[0029] In the specific implementation, in order to make the steel shell layer 25 and the lining plastic layer 27 fit tightly and without gaps, the inner surface of the steel part is shot blasted and rust-removed before the board is attached to remove surface impurities. Small steel shots are used for spraying, and the rust removal level is Sa2.5, with a roughness of ≥ Ry70μm, to ensure that the inner wall is clean and rough to increase the adhesion and prevent the PTFE board from falling off after attachment. At the same time, a special imported adhesive, Shimin printing glue, is applied to the surface of the sodium-treated PTFE board and the surface of the steel body to be lined. The glue has strong adhesion, good toughness, high strength, is not easy to volatilize, is resistant to high temperatures, is insulated, has a good appearance after use, and is easy to operate. When attaching the board, hot processing is used to soften the bonding. The adhesive layer 25 on the surface of the steel shell and the adhesive layer 26 on the surface of the PTFE board are heated and melted to make the lining plastic layer 27 close to the inner surface of the steel shell layer 24. There is no vacuum interlayer and it is not affected by air heat flow.

[0030] like Figure 2 As shown, in a preferred embodiment, the lining plastic layer 27 is formed by splicing a plurality of sodium polytetrafluoroethylene plates.

[0031] The joints between the PTFE plates are hot-melt filled with soluble polytetrafluoroethylene (PFA) welding rods and welding strips, so that the entire plastic lining layer forms an organic whole.

[0032] In a preferred embodiment, a V-shaped groove is formed at the joint of the sodium polytetrafluoroethylene plate, a PFA round welding rod filling layer 28 is arranged in the V-shaped groove, and a PFA wide welding strip covering layer 29 is arranged at the top opening of the V-shaped groove. In specific implementation, the joints between the sodium polytetrafluoroethylene plates are welded by hot melt welding, and the joints are repaired into a V-shaped groove to increase the welding contact area. First, the soluble polytetrafluoroethylene PFA round welding rod 28 is used for filling, and then the PFA wide welding strip 29 is used for covering to ensure the sealing and strength of the welded joint, so that the sodium polytetrafluoroethylene plate is organically formed into a complete lining surface, with good molding effect, stable structure, smooth surface and uniform texture.

[0033] like Figure 1 , 2 As shown, the utility model is provided with various functional pipe openings, the tank body is lined with sodium polytetrafluoroethylene plate, the equipment pipe opening is directly pulled into the formed polytetrafluoroethylene sleeve, the size of the polytetrafluoroethylene sleeve should be slightly larger than the inner diameter of the pipe by 1-2mm, to ensure that the polytetrafluoroethylene pipe fits tightly with the pipe after being pulled in and will not loosen, the flange mouth is heated and flanging, and all flange sealing surfaces are required to be flat and smooth, and the inner part of the tank is subjected to PFA hot-melt welding to form the polytetrafluoroethylene pipe and the inner wall polytetrafluoroethylene plate into a whole.

[0034] like Figure 1 As shown, in one or more embodiments, a light-transmitting hole 10 is provided on the tank top, which can be used to observe the situation inside the tank and, like the exhaust pressure relief port 7, can be opened when there is a sudden overpressure or negative pressure inside the tank to play a role in safety relief.

[0035] like Figure 1 As shown, in one or more embodiments, a straight ladder 1 with a cage is provided on one side of the tank wall 13, and the straight ladder 1 is welded and fixed on the tank wall reinforcement ring 14 to avoid direct contact with the tank wall, so as to avoid affecting the plastic layer of the tank lining during welding. A platform fence 4 is provided on the tank top 8. This ensures that workers can climb up to the tank top 8 for inspection and maintenance safely, conveniently and quickly.

[0036] like Figure 1 As shown, in one or more embodiments, lifting ears a and lifting ears b are respectively provided on both sides of the tank wall 13 to facilitate the manufacture, transportation and lifting of the steel-lined PTFE storage tank.

[0037] like Figure 1 As shown, in one or more embodiments, the tank top 8 is welded with a tank top reinforcement rib 9, and the tank wall 13 is welded with a tank wall reinforcement ring 14 to improve the strength of the tank body and avoid stress deformation of the steel-lined PTFE storage tank during production, transportation and hoisting.

[0038] like Figure 1 ,3 As shown, in one or more embodiments, a top ring baffle plate 3 and a bottom ring baffle plate 22 are respectively provided at the large angle seam of the tank top and the large angle seam of the tank bottom to avoid sharp corners when the plates are attached inside the tank, causing stress concentration and affecting the adhesion between the PTFE plate and the steel parts, thereby ensuring that the entire lining layer is smooth and flat.

[0039] The above description is only a preferred embodiment of the present invention, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel-lined PTFE storage tank, comprising a tank body, the tank body consisting of a tank top, a tank wall and a tank bottom plate, characterized in that: The tank body includes a steel shell layer, an adhesive layer on the surface of the steel shell, an adhesive layer on the surface of a polytetrafluoroethylene plate, and a plastic lining layer. The steel shell layer and the plastic lining layer are respectively the outer wall and the inner wall of the tank body. The adhesive layer on the surface of the steel shell is arranged on the inner side of the steel shell layer, the adhesive layer on the surface of the polytetrafluoroethylene plate is arranged on the inner side of the plastic lining layer, and the adhesive layer on the surface of the steel shell and the adhesive layer on the surface of the polytetrafluoroethylene plate are bonded to each other.

2. The steel-lined PTFE storage tank according to claim 1, characterized in that: The plastic lining layer is formed by splicing a plurality of sodium polytetrafluoroethylene plates.

3. The steel-lined PTFE storage tank according to claim 2, characterized in that: A V-shaped groove is formed at the joint of the sodium polytetrafluoroethylene plates, a PFA round welding rod filling layer is arranged in the V-shaped groove, and a PFA wide welding strip cover layer is arranged at the top opening of the V-shaped groove.

4. The steel-lined PTFE storage tank according to claim 2 or 3, characterized in that: The storage tank body is provided with a plurality of equipment pipe openings, polytetrafluoroethylene pipes are installed inside the equipment pipe openings, and the inner ends of the polytetrafluoroethylene pipes are connected with the lining plastic layer to form a whole.

5. The steel-lined PTFE storage tank according to claim 4, characterized in that: A straight ladder with a protective cage is provided on one side of the tank wall.

6. The steel-lined PTFE storage tank according to claim 1 or 5, characterized in that: Lifting ears a and b are respectively provided on both sides of the top of the tank wall.

7. The steel-lined PTFE storage tank according to claim 6, characterized in that: The tank wall is welded with a tank wall reinforcement ring.

8. The steel-lined PTFE storage tank according to claim 1 or 7, characterized in that: The tank top is welded with tank top reinforcement ribs.

9. The steel-lined PTFE storage tank according to claim 8, characterized in that: A platform fence is provided on the tank top.

10. The steel-lined PTFE storage tank according to claim 9, characterized in that: There is a light-transmitting hole on the top of the tank.

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