Steel lining plastic high-temperature shell ring

Abstract

The utility model relates to a shell ring in the field of chemical industry, in particular to a steel lining plastic high-temperature shell ring which comprises a shell wall and a plastic lining, the plastic lining comprises a second plastic lining made of PTFE (Polytetrafluoroethylene), PFA (Polyfluoroalkoxy), ETFE (Ethylene Tetra Fluoro Ethylene) or FEP (Fluorinated Ethylene Propylene) materials and a first plastic lining made of PP (Polypropylene), PO (Polypropylene) or PE (Polyethylene) materials, and a cooling coil is embedded in the first plastic lining. The device is simple in structure, the lining strength can be synchronously improved, meanwhile, the surface temperature of the second plastic lining is reduced, and heat energy in the barrel section is recycled.

Description

Technical Field

[0001] The utility model relates to a cylinder section in the chemical industry, in particular to a steel-lined plastic high-temperature cylinder section. Background Art

[0002] In the AHF devices produced by the fluorite method and the fluorosilicic acid method, many equipments choose steel-lined PTFE materials considering the corrosiveness and strong permeability of the medium. However, for high-temperature cylinder sections, the reliability of the fluorine lining layer is poor under high-temperature working conditions.

[0003] To solve the above problems, Chinese Patent Publication No. CN1807957A discloses a fluorine-containing product, which can be used as a metal pipe lining. It is composed of inner and outer fluoroplastic layers 1 and a metal mesh sleeve, and the added metal mesh sleeve improves the strength of the cylinder.

[0004] Another example is Chinese patent publication number CN112516919A, which discloses a high temperature and negative pressure resistant PTFE plate lining, in which a transition layer is fixedly connected to the inner wall of the upper shell of the equipment, a PTFE plate lining layer is arranged inside the transition layer, a plurality of evenly distributed through holes are drilled on the transition layer, and the through holes are filled with a fixing material, and the outer surface of the PTFE plate lining layer is compounded with a layer of PFA material film, and the fixing material is PFA fluoroplastic. The above structure is relatively complex and difficult to process.

[0005] The above documents are all based on improving the strength of the lining without considering reducing the surface temperature. However, in the actual fluorite method and fluorosilicic acid method AHF production devices, there are high operating temperatures of the cylinder sections near the sulfuric acid inlet and the steam inlet (such as operating temperatures of 150-200°C). The reliability of the fluoroplastic lining is reduced under high temperature conditions. How to reduce the surface temperature of the fluoroplastic lining and improve its reliability is a technical problem that needs to be solved. Summary of the invention

[0006] The purpose of the utility model is to solve the above technical problems and provide a steel-lined plastic high-temperature cylinder section which has a simple structure and can simultaneously improve the lining strength, reduce the surface temperature of the fluoroplastic lining and recover heat energy.

[0007] The utility model discloses a steel-lined plastic high-temperature cylinder section, comprising a cylinder wall and a plastic lining, wherein the plastic lining comprises a second plastic lining made of PTFE, PFA, ETFE or FEP material, and a first plastic lining made of PP, PO or PE material located between the second plastic lining and the cylinder wall, wherein a cooling coil is embedded in the first plastic lining.

[0008] The cooling liquid inlet and outlet of the cooling coil are arranged on the cylinder wall.

[0009] The cross section of the cooling coil is circular or square, the outer diameter of the circular tube is Φ4-φ32mm, and the outer size of the square tube is 3×3-30×30mm. The wall of the tube is provided with an air hole connected to the plastic lining, and a plug is provided on the air hole.

[0010] The thickness of the plastic lining 2 is 5-35 mm, and the thickness of the plastic lining 1 is 1.5-8 mm. Beneficial effects:

[0011] Embedding a cooling coil in the plastic lining has multiple effects: 1) Passing coolant into the cooling coil can cool the plastic lining layer, reduce the surface temperature of the plastic lining two, and increase the service life of the lining; 2) Using the coolant to recover heat can save energy and reduce consumption; 3) Since the temperature of the plastic lining one can be effectively reduced, the plastic lining two that is in direct contact with the medium still selects PTFE, PFA, ETFE or FEP materials with good melting point, temperature resistance and good permeability resistance, but the plastic lining one where the cooling coil is embedded can select PP, PO or PE materials with low melting point and low temperature resistance, thereby reducing the manufacturing cost; and PP, PO Or the PE material has a low melting point and has good fluidity after melting. After the coil and the cylinder wall are assembled, the low-melting-point molten plastic can be used to fill the space between the cylinder wall and the plastic lining 2 to form a plastic lining 1, which has low manufacturing difficulty and is easy to produce; 4) The cooling coil also plays a skeleton effect, increases the rigidity and strength of the plastic lining layer, reduces the high-temperature creep deformation of the fluorine lining layer, and improves the reliability of the plastic lining layer; if the plastic lining 2 in contact with the medium leaks, the medium will corrode the cooling coil, but the pipeline system has instrument detection, and measures can be taken as soon as possible to avoid corrosion to the cylinder wall and cause a large amount of internal medium leakage to cause a major accident.

[0012] The utility model has a simple structure, is easy to manufacture, reduces production costs, can simultaneously improve lining strength, and simultaneously reduce the surface temperature of the second plastic lining and recover heat energy, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model.

[0014] Figure 2 for Figure 1 AA section view.

[0015] Among them, 1-flange, 2-cylinder wall, 3-process pipe mouth, 4-coolant inlet, 5-coolant outlet, 6-cooling coil, 7-plastic lining 1, 8-plastic lining 2, 9-plug, 10-air hole. DETAILED DESCRIPTION

[0016] The utility model is further explained below in conjunction with the accompanying drawings:

[0017] See also Figure 1 and Figure 2 In this embodiment, it includes a cylinder wall 2 with a process pipe mouth 3, a flange 1 on the cylinder wall, and a plastic lining inside the cylinder wall 2, wherein the plastic lining includes a plastic lining 2 8 made of PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer), ETFE (polytetrafluoroethylene-ethylene tetrafluoroethylene) or FEP (polytetrafluoroethylene-fluorinated ethylene propylene) material, and a plastic lining 1 7 made of PP (polypropylene), PO (polyvinyl alcohol) or PE (polyethylene) material located between the plastic lining 2 8 and the cylinder wall 2.

[0018] Among them, a cooling coil 6 is embedded in the plastic lining 7, and the cooling coil 6 can be made of metal or plastic. The cooling coil 6 is fixed on the cylinder wall 2, and its coolant inlet 4 and coolant outlet 5 are also arranged on the cylinder wall 2. The cross section of the cooling coil 6 is circular or square, and the outer diameter of the circular tube is preferably Φ4 to φ32 mm, and the outer size of the square tube is preferably 3×3 to 30×30 mm. In this embodiment, the thickness of the plastic lining 2 8 is preferably 5 to 35 mm, and the thickness of the plastic lining 1 7 is preferably 1.5 to 8 mm.

[0019] The cylinder wall 2 is provided with air holes 10 and plugs 9. The existence of the air holes 10, on the one hand, can suck the air between the plastic liner 1 7, the plastic liner 2 8 and the cylinder wall 2 during installation, so that they can be tightly attached to the cylinder wall 2; on the other hand, the air holes 10 can be used to detect the penetration or leakage of the medium. If the suction gas composition is abnormal, it means that the cylinder section 2 or the plastic liner 2 8 is damaged. On the other hand, if the plastic liner 2 8 leaks, the medium will corrode the cooling coil 6, but the pipeline system connecting the cooling coil 6 has instrument detection, so it can be discovered in time and measures can be taken as soon as possible to avoid corrosion to the cylinder wall 2, resulting in a large amount of internal medium leakage and causing a major accident, further improving production safety.

Claims

1. A steel-lined plastic high-temperature cylinder section, comprising a cylinder wall and a plastic lining, characterized in that: The plastic lining includes a second plastic lining made of PTFE, PFA, ETFE or FEP material, and a first plastic lining made of PP, PO or PE material located between the second plastic lining and the cylinder wall, wherein a cooling coil is embedded in the first plastic lining.

2. The steel-lined plastic high-temperature cylinder section according to claim 1, characterized in that: The cooling liquid inlet and outlet of the cooling coil are arranged on the cylinder wall.

3. The steel-lined plastic high-temperature cylinder section according to claim 1 or 2, characterized in that: The cross section of the cooling coil is circular or square, the outer diameter of the circular tube is Φ4 to φ32 mm, and the outer size of the square tube is 3×3 to 30×30 mm.

4. The steel-lined plastic high-temperature cylinder section according to claim 1 or 2, characterized in that: The cylinder wall is provided with an air hole connected to the plastic liner, and a plug is provided on the air hole.

5. The steel-lined plastic high-temperature cylinder section according to claim 1 or 2, characterized in that: The thickness of the second plastic lining is 5-35 mm, and the thickness of the first plastic lining is 1.5-8 mm.

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