Pipeline and negative pressure equipment for producing high-purity sulfuric acid

Abstract

The utility model provides a high-purity sulfuric acid production pipeline and negative pressure equipment, the high-purity sulfuric acid production pipeline comprises an outer pipe body, an inner pipe body arranged on the inner wall of the outer pipe body in a matched mode and a bonding layer arranged between the outer pipe body and the inner pipe body, the outer wall of the inner pipe body is attached to the inner wall of the inner pipe body, and the thickness A of the outer pipe body and the thickness B of the inner pipe body meet the condition that B / A is larger than or equal to 1.5 and smaller than or equal to 2.5, the inner pipe body is made of polytetrafluoroethylene, the outer pipe body is made of 304 stainless steel, the bonding layer is made of epoxy resin, and the thickness of the inner pipe body, the thickness of the outer pipe body, the material of the inner pipe body, the material of the outer pipe body and the material of the bonding layer are designed, so that the exhaust pipe of the negative pressure equipment can be prevented from being corroded and carbonized by acid liquor; the device can effectively improve the purity of sulfuric acid and ensure the quality of sulfuric acid cost, and has the advantages of meeting the green chemical production concept, being simple in structure, long in service life and convenient to overhaul, maintain, popularize and implement.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-purity sulfuric acid production equipment, and particularly relates to a pipeline and negative pressure equipment for high-purity sulfuric acid production. BACKGROUND

[0002] In the prior art, in the actual production process of high-purity sulfuric acid, sulfur trioxide and sulfur dioxide gas will be emitted from the circulating tank of the absorption section of the sulfuric acid production system during operation, which seriously affects the health of the operating personnel and the atmospheric environment, so an air extraction pipe is provided on each circulating tank in the actual production process of high-purity sulfuric acid to extract sulfur trioxide and sulfur dioxide back to the sulfuric acid negative pressure system, so as to ensure the health of the operating personnel and avoid pollution of the atmospheric environment.

[0003] In the prior art, the air extraction pipe is usually directly made of a PVC plastic pipe or a PP plastic pipe. With the increase of the service life, the pipe wall of the air extraction pipe will be corroded and carbonized, and the sulfur dioxide and sulfur trioxide condensate in the pipe will flow into the circulating tank along the pipe with the carbonized substances, so that the recovered acid liquid in the circulating tank contains a large number of black suspended particles, and the sulfuric acid is brown, which affects the colority of the finished sulfuric acid and cannot meet the quality requirements of the superior product and the requirements of the user, so that the product needs to be filtered and purified in the later stage, which increases the production cost and the labor cost. Therefore, it is urgent to make improvements. CONTENT OF THE UTILITY MODEL

[0004] The application is proposed to solve the technical problem in the prior art that, in the actual production process of high-purity sulfuric acid, negative pressure equipment is needed to extract the leaked sulfur trioxide and sulfur dioxide gas, so as to ensure the health of the operating personnel and avoid pollution of the atmospheric environment. The air extraction pipe of the traditional negative pressure equipment is usually directly made of a PVC plastic pipe or a PP plastic pipe. With the increase of the service life, the pipe wall of the air extraction pipe will be corroded and carbonized, and the sulfur dioxide and sulfur trioxide condensate in the pipe will flow into the circulating tank along the pipe with the carbonized substances, which will seriously reduce the quality of the finished sulfuric acid and significantly increase the production cost of the sulfuric acid.

[0005] The application adopts the following scheme, a pipeline for high-purity sulfuric acid production, comprising an outer pipe body, an inner pipe body matched on the inner wall of the outer pipe body, and a bonding layer between the outer pipe body and the inner pipe body, the outer wall of the inner pipe body is attached to the inner wall of the outer pipe body, the thickness of the outer pipe body is defined as A, the thickness of the inner pipe body is defined as B, the A and the B satisfy the following relationship: 1.5≤B / A≤2.5, the material of the inner pipe body is selected from polytetrafluoroethylene, the material of the outer pipe body is selected from 304 stainless steel, and the material of the bonding layer is selected from epoxy resin.

[0006] In some possible embodiments, a positioning assembly is further arranged between the outer pipe body and the inner pipe body, and when the inner pipe body is matched to the inner wall of the outer pipe body, the positioning assembly is used to position the end of the inner pipe body to the end of the outer pipe body.

[0007] In some possible embodiments, the positioning assembly comprises a positioning groove arranged at the end of the outer pipe body, and a positioning protrusion arranged at the inner pipe body at a position corresponding to the positioning groove, and when the inner pipe body is matched to the inner wall of the outer pipe body, the positioning protrusion can be matched to extend into the positioning groove, so as to position the end of the inner pipe body to the end of the outer pipe body.

[0008] In some possible embodiments, the high-purity sulfuric acid production pipeline comprises a plurality of inner pipe bodies and an outer pipe body,

[0009] The thickness of the positioning protrusion is defined as C;

[0010] The depth of the positioning groove is defined as D;

[0011] The C and the D satisfy the following relationship: 2≤C / D≤3.5.

[0012] In some possible embodiments, a connecting assembly is further arranged at the end of the inner pipe body, and a plurality of the inner pipe bodies can be detachably connected through the connecting assembly.

[0013] In some possible embodiments, the connecting assembly comprises a connecting groove arranged at one end of the inner pipe body, and a connecting protrusion arranged at the other end of the inner pipe body at a position corresponding to the connecting groove, and when a plurality of the inner pipe bodies are detachably connected, the connecting protrusion can be matched to extend into the connecting groove.

[0014] In some possible embodiments, a fastening assembly is further arranged at the end of the outer pipe body, and when a plurality of the inner pipe bodies are detachably connected, the fastening assembly is used to tightly fit adjacent two inner pipe bodies.

[0015] In some possible embodiments, the fastening assembly comprises a connecting lug arranged at the end of the outer pipe body, a plurality of connecting holes arranged on the connecting lug, and a fastener matched to the connecting holes.

[0016] In order to solve the technical problems proposed in the present application, the present application further provides a negative pressure equipment for high-purity sulfuric acid production, which comprises the high-purity sulfuric acid production pipeline described above.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] This application provides a pipeline and negative pressure equipment for high-purity sulfuric acid production, comprising an outer pipe body, an inner pipe body fitted onto the inner wall of the outer pipe body, and an adhesive layer between the outer and inner pipe bodies. The outer wall of the inner pipe body is attached to the inner wall of the inner pipe body. The thicknesses A of the outer pipe body and B of the inner pipe body satisfy: 1.5≤B / A≤2.5. The inner pipe body is made of polytetrafluoroethylene (PTFE), the outer pipe body is made of 304 stainless steel, and the adhesive layer is made of epoxy resin. By designing the thicknesses of the inner and outer pipe bodies, the materials of the inner and outer pipe bodies, and the adhesive layer, the exhaust pipe of the negative pressure equipment can be prevented from being corroded and carbonized by acid, effectively improving the purity of sulfuric acid and ensuring the quality of sulfuric acid. It has the advantages of conforming to the concept of green chemical production, simple structure, long service life, easy maintenance, and easy promotion and implementation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a pipeline for the production of high-purity sulfuric acid according to this application;

[0020] Figure 2 This is a top view of a pipeline used for the production of high-purity sulfuric acid according to this application;

[0021] Figure 3 This application Figure 2 Sectional view at point AA;

[0022] Figure 4 This application Figure 2 Sectional view at point BB;

[0023] Figure 5 This is a schematic diagram of the exploded structure of a pipeline for the production of high-purity sulfuric acid according to this application. Detailed Implementation

[0024] Combination Figures 1-5 The content shown further illustrates the technical solution provided in this application: a pipeline for high-purity sulfuric acid production, comprising an outer pipe body 1, an inner pipe body 2 matched and disposed on the inner wall of the outer pipe body 1, and an adhesive layer disposed between the outer pipe body 1 and the inner pipe body 2. The outer wall of the inner pipe body 2 is attached to the inner wall of the outer pipe body 1. The thickness of the outer pipe body 1 is defined as A, and the thickness of the inner pipe body 2 is defined as B. The relationship between A and B is: 1.5≤B / A≤2.5. The inner pipe body 2 is made of polytetrafluoroethylene, the outer pipe body 1 is made of 304 stainless steel, and the adhesive layer is made of epoxy resin.

[0025] In actual implementation, B / A = 2.

[0026] The application provides a pipeline and negative pressure equipment for high-purity sulfuric acid production, which comprises an outer pipe body, an inner pipe body matched with the inner wall of the outer pipe body, and a bonding layer arranged between the outer pipe body and the inner pipe body, wherein the outer wall of the inner pipe body is attached to the inner wall of the inner pipe body, the thickness A of the outer pipe body and the thickness B of the inner pipe body satisfy 1.5≤B / A≤2.5, the material of the inner pipe body is polytetrafluoroethylene, the material of the outer pipe body is 304 stainless steel, and the material of the bonding layer is epoxy resin. By designing the thickness of the inner pipe body, the thickness of the outer pipe body, the material of the inner pipe body, the material of the outer pipe body and the material of the bonding layer, the suction pipe of the negative pressure equipment can be prevented from being corroded and carbonized by acid liquid, the purity of sulfuric acid can be effectively improved, the quality of sulfuric acid cost can be ensured, the green chemical production concept can be met, the structure is simple, the service life is long, maintenance is convenient, and the application is convenient to popularize and implement.

[0027] In the implementation process of the embodiment, a positioning assembly 3 is arranged between the outer pipe body 1 and the inner pipe body 2, and when the inner pipe body 2 is matched with the inner wall of the outer pipe body 1, the positioning assembly 3 is used to position the end of the inner pipe body 2 to the end of the outer pipe body 1.

[0028] In the implementation process of the embodiment, the positioning assembly 3 comprises a positioning groove 30 arranged at the end of the outer pipe body 1 and a positioning protruding edge 31 arranged at the position of the inner pipe body 2 corresponding to the positioning groove 30, and when the inner pipe body 2 is matched with the inner wall of the outer pipe body 1, the positioning protruding edge 31 can be matched into the positioning groove 30, so that the end of the inner pipe body 2 is positioned to the end of the outer pipe body 1.

[0029] In the actual implementation process, the precise butt joint of the inner pipe body and the outer pipe body can be realized through the positioning assembly, so as to ensure the reliability of the connection. The working principle is that the end of the outer pipe body is provided with a positioning groove, and the end of the inner pipe body is provided with a positioning protruding edge. When the inner pipe body is inserted into the inner part of the outer pipe body and matched with the inner wall, the positioning protruding edge will be clamped into the positioning groove, and the end of the inner pipe body is accurately positioned at the end of the outer pipe body. This design makes the inner pipe body and the outer pipe body realize good sealing surface matching, further improves the strength and stability of the whole connection.

[0030] In the implementation process of the embodiment, the pipeline for high-purity sulfuric acid production comprises an outer pipe body, an inner pipe body matched with the inner wall of the outer pipe body, and a bonding layer arranged between the outer pipe body and the inner pipe body, wherein the outer wall of the inner pipe body is attached to the inner wall of the inner pipe body, the thickness A of the outer pipe body and the thickness B of the inner pipe body satisfy 1.5≤B / A≤2.5, the material of the inner pipe body is polytetrafluoroethylene, the material of the outer pipe body is 304 stainless steel, and the material of the bonding layer is epoxy resin.

[0031] The thickness of the positioning protruding edge 31 is defined as C;

[0032] The depth of the positioning groove 30 is defined as D;

[0033] The C and the D satisfy the following relationship: 2≤C / D≤3.5.

[0034] In the actual implementation process, C / D=2.

[0035] The embodiment further comprises a connecting assembly 4 arranged on the end of the inner pipe body 2, and a plurality of the inner pipe bodies 2 can be detachably connected through the connecting assembly 4.

[0036] In the embodiment, the connecting assembly 4 comprises a connecting groove 40 arranged on one end of the inner pipe body 2 and a connecting protrusion 41 arranged on the other end of the inner pipe body 2 at a position corresponding to the connecting groove 40, and when a plurality of the inner pipe bodies 2 are connected, the connecting protrusion 41 can be matched into the connecting groove 40.

[0037] In actual implementation, the connecting groove is arranged on one end of the inner pipe body and the connecting protrusion is arranged on the other end of the inner pipe body and at a position corresponding to the connecting groove. For example, when a plurality of the inner pipe bodies need to be connected, the connecting protrusion can be matched into the connecting groove to complete the connection, and the connection can be released by pulling out the connecting protrusion from the connecting groove. The detachable connection design makes the inner pipe body easier to assemble and disassemble, facilitates maintenance and replacement of the single inner pipe body, and can effectively prolong the service life of the suction pipe.

[0038] In the embodiment, the connecting assembly 4 comprises a connecting groove 40 arranged on one end of the inner pipe body 2 and a connecting protrusion 41 arranged on the other end of the inner pipe body 2 at a position corresponding to the connecting groove 40, and when a plurality of the inner pipe bodies 2 are connected, the connecting protrusion 41 can be matched into the connecting groove 40.

[0039] In the embodiment, the connecting assembly 5 comprises a connecting lug 50 arranged on the end of the outer pipe body 1, a plurality of connecting holes 51 arranged on the connecting lug 50, and a fastener matched with the connecting hole 51.

[0040] In actual implementation, a sealing gasket is further arranged between the two inner pipe bodies, and the sealing gasket is made of polytetrafluoroethylene, which can effectively improve the air tightness of the suction pipe and improve the stability of gas flow.

[0041] To solve the technical problems proposed in the application, the application further provides a negative pressure equipment for high-purity sulfuric acid production, comprising a pipe line for high-purity sulfuric acid production.

[0042] The application provides a pipeline and negative pressure equipment for high-purity sulfuric acid production, which comprises an outer pipe body, an inner pipe body matched with the inner wall of the outer pipe body, and a bonding layer between the outer pipe body and the inner pipe body, wherein the outer wall of the inner pipe body is attached to the inner wall of the inner pipe body, the thickness A of the outer pipe body and the thickness B of the inner pipe body satisfy 1.5≤B / A≤2.5, the material of the inner pipe body is polytetrafluoroethylene, the material of the outer pipe body is 304 stainless steel, and the material of the bonding layer is epoxy resin. Through the design of the thickness of the inner pipe body, the thickness of the outer pipe body, the material of the inner pipe body, the material of the outer pipe body and the material of the bonding layer, the suction pipe of the negative pressure equipment can be prevented from being corroded and carbonized by acid liquid, the purity of sulfuric acid can be effectively improved, the quality of sulfuric acid cost can be ensured, the green chemical production concept is met, the structure is simple, the service life is long, maintenance is convenient, and the application is convenient to promote and implement.

[0043] The above is an embodiment of the application and does not limit the application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A pipeline for producing high-purity sulfuric acid, characterized in that, The pipe comprises an outer tube (1), an inner tube (2) matched with the inner wall of the outer tube (1), and a bonding layer between the outer tube (1) and the inner tube (2), the outer wall of the inner tube (2) is attached to the inner wall of the outer tube (1), the thickness of the outer tube (1) is defined as A, the thickness of the inner tube (2) is defined as B, the A and the B satisfy the following relationship: 1.5≤B / A≤2.5, the material of the inner tube (2) is polytetrafluoroethylene, the material of the outer tube (1) is 304 stainless steel, and the material of the bonding layer is epoxy resin.

2. The pipe for producing high purity sulfuric acid according to claim 1, wherein The pipe further comprises a positioning assembly (3) between the outer tube (1) and the inner tube (2), when the inner tube (2) is matched with the inner wall of the outer tube (1), the positioning assembly (3) is used to position the end of the inner tube (2) on the end of the outer tube (1).

3. The pipe for producing high purity sulfuric acid according to claim 2, wherein The positioning assembly (3) comprises a positioning groove (30) on the end of the outer tube (1), and a positioning protrusion (31) on the inner tube (2) at the corresponding position of the positioning groove (30), when the inner tube (2) is matched with the inner wall of the outer tube (1), the positioning protrusion (31) can be matched into the positioning groove (30), so that the end of the inner tube (2) is positioned on the end of the outer tube (1).

4. The pipe for producing high-purity sulfuric acid according to claim 3, wherein the thickness of the positioning protrusion (31) is defined as C, the depth of the positioning groove (30) is defined as D, and the C and the D satisfy the following relationship: 2≤C / D≤3.

5. The pipe further comprises a connecting assembly (4) on the end of the inner tube (2), a plurality of the inner tubes (2) can be detachably connected through the connecting assembly (4). The connecting assembly (4) comprises a connecting groove (40) on one end of the inner tube (2), and a connecting protrusion (41) on the other end of the inner tube (2) at the corresponding position of the connecting groove (40), when a plurality of the inner tubes (2) are detachably connected, the connecting protrusion (41) can be matched into the connecting groove (40). The pipe further comprises a fastening assembly (5) on the end of the outer tube (1), when a plurality of the inner tubes (2) are detachably connected, the fastening assembly (5) is used to tightly attach adjacent two inner tubes (2).

5. The pipe for producing high purity sulfuric acid according to claim 1, wherein The fastening assembly (5) comprises a connecting lug (50) on the end of the outer tube (1), a plurality of connecting holes (51) on the connecting lug (50), and a fastener matched with the connecting holes (51).

6. The pipe for producing high purity sulfuric acid according to claim 5, wherein The pipe comprises any one of claims 1-8.

7. The pipe for producing high purity sulfuric acid according to claim 1, wherein ​ 8. The pipe for producing high purity sulfuric acid according to claim 7, wherein ​ 9. A negative pressure device for high purity sulfuric acid production, characterized by, ​

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