Acid injection mixing pipe, preparation method thereof and acid injection mixer

Abstract

The invention provides an acid injection mixing pipe, a preparation method of the acid injection mixing pipe and the acid injection mixing pipe, and belongs to the field of pipeline engineering design. The acid injection mixing pipe comprises a vertical insertion pipe, a first flange arranged on the outer wall of the middle part of the vertical insertion pipe and a second flange arranged at the end part of the inlet end of the vertical insertion pipe; pTFE outer lining protection layers are arranged on the upper surface of the first flange and the outer wall, located between the first flange and the outlet end of the vertical insertion pipe, of the vertical insertion pipe. PTFE lining protection layers are arranged on the inner wall of the vertical insertion pipe and the end face, flush with the vertical insertion pipe, of the second flange. And the PTFE outer lining protection layer and the PTFE inner lining protection layer are welded and fused on the end face of the outlet end of the vertical insertion pipe so as to form a fully-wrapped PTFE isolation layer. The corrosion phenomenon of the acid injection mixing pipe structure cannot occur under the working conditions of any concentration and temperature of concentrated sulfuric acid water injection dilution, so that the long-term normal and stable operation of the device is ensured, and the cost is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the field of pipeline engineering design, and in particular relates to an acid injection mixing tube and a preparation method thereof, and an acid injection mixing tube. Background Art

[0002] The existing acid injection mixer structure is generally a full nickel-based metal (Alloy 20) or Alloy 20 lined with PTFE structure, which is very expensive, with a unit price of 700 to 800 yuan / kg.

[0003] For some working conditions of water injection and dilution of concentrated sulfuric acid, the effect of this structure is not ideal. When concentrated sulfuric acid is diluted by water injection, an exothermic reaction occurs, causing the medium temperature to rise, and the local temperature can reach up to 100°C. Alloy 20 will begin to corrode when the temperature exceeds 50°C in the sulfuric acid immersion environment. In engineering practice, due to the different injection amounts and injection speeds, the concentration and temperature of sulfuric acid near the acid injection port will vary greatly. For environments with a concentration below 20% and a temperature below 80°C, the existing acid injection mixer structure can basically meet engineering needs. However, in engineering practice, the concentration and temperature of sulfuric acid at the acid injection port often exceed the above conditions, resulting in corrosion of the metal structure at the acid injection port. The existing countermeasures are mainly to increase the wall thickness of the Alloy 20 injection pipe at the acid injection port to offset the corrosion of sulfuric acid. However, the concentration and temperature of sulfuric acid at the acid injection port often change, resulting in uneven corrosion at this location. It is difficult to accurately estimate the life cycle of the metal pipe wall at this location. In extreme cases, the pipe wall may be completely corroded within two to three years. Once this happens, the pipeline will leak and have to be stopped for repair or replacement, resulting in relatively large economic losses. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and provide an acid injection mixing tube and a preparation method thereof, and an acid injection mixing tube, which can avoid corrosion under the condition of concentrated sulfuric acid injection and dilution, thereby ensuring long-term continuous and stable operation of the device.

[0005] One of the purposes of the present invention is to provide an acid injection mixing tube.

[0006] A second object of the present invention is to provide a method for preparing an acid injection mixing tube.

[0007] A third object of the present invention is to provide an acid injection mixer.

[0008] The present invention is achieved through the following technical solutions:

[0009] A first aspect of the present invention provides an acid injection mixing tube, comprising: a vertical insertion tube, a first flange disposed on the outer wall of the middle portion of the vertical insertion tube, and a second flange disposed at the end of the inlet end of the vertical insertion tube;

[0010] A PTFE outer lining protective layer is provided on the upper surface of the first flange and on the outer wall of the vertical insertion tube between the first flange and the outlet end of the vertical insertion tube;

[0011] A PTFE lining protective layer is provided on the inner wall of the vertical insertion tube and on the end surface of the second flange flush with the vertical insertion tube;

[0012] The PTFE outer lining protective layer and the PTFE inner lining protective layer are welded and fused on the end surface of the outlet end of the vertical insertion tube, thereby forming a fully wrapped PTFE isolation layer.

[0013] A further improvement of the present invention is:

[0014] The fully wrapped PTFE isolation layer is 3-4 mm.

[0015] A further improvement of the present invention is:

[0016] The vertical insertion tube is a carbon steel tube with an inner diameter of 25-40 mm and a tube wall of 3-4 mm, and the outlet end of the vertical insertion tube is a 45° oblique cut.

[0017] A further improvement of the present invention is:

[0018] The PTFE outer lining protective layer is tightly attached to the upper surface of the first flange and the outer wall of the vertical insertion tube through a heating extrusion process.

[0019] A further improvement of the present invention is:

[0020] The PTFE lining protective layer is tightly attached to the second flange end face and the inner wall of the vertical insertion tube through a heating extrusion process.

[0021] A second aspect of the present invention provides a method for preparing an acid injection mixing tube, which specifically comprises:

[0022] Welding the first flange to the outer wall of the middle part of the vertical insertion tube, and welding the second flange to the end of the inlet end of the vertical insertion tube;

[0023] The PTFE outer lining protective layer and the PTFE inner lining protective layer are respectively tightly attached to the outer wall and the inner wall of the vertical insertion tube by using a heating extrusion process;

[0024] Finally, the PTFE outer lining protective layer and the PTFE inner lining protective layer are tightly fused by welding at one end of the 45° cut at the vertical insertion end, thereby forming a fully wrapped PTFE isolation layer.

[0025] A further improvement of the present invention is:

[0026] When the PTFE outer lining protective layer and the PTFE inner lining protective layer are tightly attached to the outer wall and inner wall of the vertical insertion tube by using a heating extrusion process, the PTFE outer lining protective layer is flanged to cover the upper surface of the first flange, and the PTFE inner lining protective layer is flanged to cover the end surface of the second flange.

[0027] A third aspect of the present invention provides an acid injection mixer, comprising:

[0028] A horizontal connecting pipe, wherein a hole is opened on the middle pipe wall of the horizontal connecting pipe, and the edge of the hole on the horizontal connecting pipe vertically extends outward to form a vertical pipe, and the inner walls of the horizontal connecting pipe and the vertical pipe are both provided with a tetrafluoroethylene protective layer;

[0029] The acid injection mixing pipe is inserted into the vertical pipeline and extends into the horizontal connecting pipe.

[0030] A further improvement of the present invention is:

[0031] A third flange is provided at the inlet end of the vertical pipe, the end face of the third flange is flush with the end face of the vertical pipe, and a tetrafluoroethylene protective layer is also provided on the end face of the third flange flush with the vertical pipe.

[0032] A further improvement of the present invention is:

[0033] The first flange and the third flange are fixed and sealed by screws.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a tetrafluoroethylene protective layer on the inner walls of the horizontal connecting pipe and the vertical pipe, and a fully wrapped PTFE isolation layer on the vertical insertion pipe, so that the horizontal connecting pipe, the vertical pipe and the vertical insertion pipe are completely isolated from the sulfuric acid solution, thereby ensuring the normal operation of the device throughout its life cycle.

[0036] The present invention can achieve the situation that the acid injection mixer structure will not be corroded under any concentration and temperature conditions of concentrated sulfuric acid water injection dilution, thereby ensuring long-term normal and stable operation of the device.

[0037] The horizontal connecting pipe, the vertical pipeline and the vertical insertion pipe in the present invention are all made of ordinary carbon steel, and compared with the existing acid injection mixer made of all nickel-based metal, the cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the acid injection mixing tube in the present invention;

[0039] Figure 2 It is a structural schematic diagram of the acid injection mixer in the present invention.

[0040] In the figure,

[0041] 1. Insert the tube vertically;

[0042] 2. First flange;

[0043] 3. Second flange;

[0044] 4. PIFE outer lining protective layer;

[0045] 5. PTFE lining protective layer;

[0046] 6. Horizontal connecting pipe;

[0047] 7. Vertical pipeline;

[0048] 8. The third flange. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0050] [Example 1]

[0051] The embodiment of the present invention provides an acid injection mixing tube, such as Figure 1 As shown, it comprises: a vertical insertion tube 1, a first flange 2 arranged on the outer wall of the middle part of the vertical insertion tube 1, and a second flange 3 arranged at the end of the inlet end of the vertical insertion tube 1;

[0052] A PTFE outer lining protective layer 4 is provided on the upper surface of the first flange 2 and the outer wall of the vertical insertion tube 1 between the first flange 2 and the outlet end of the vertical insertion tube 1 to prevent concentrated sulfuric acid from corroding the first flange 2 and the outer wall of the vertical insertion tube 1, thereby enhancing the anti-corrosion effect, extending the service life and reducing the cost;

[0053] A PTFE lining protective layer 5 is provided on the inner wall of the vertical insertion tube 1 and the end surface of the second flange 3 flush with the vertical insertion tube 1 to prevent concentrated sulfuric acid from corroding the inside of the vertical insertion tube 1 and the second flange 3, thereby enhancing the anti-corrosion effect, further extending the service life and reducing the cost;

[0054] The PTFE outer lining protective layer 4 and the PTFE inner lining protective layer 5 are welded and fused on the end surface of the outlet end of the vertical insertion tube 1, thereby forming a fully wrapped PTFE isolation layer. The fully wrapped PTFE isolation layer is 3-4 mm, so that the inner wall, outer wall, upper surface of the first flange 2 and end surface of the second flange 3 of the vertical insertion tube 1 are all wrapped with PTFE, which enhances the anti-corrosion effect, further prolongs the service life and reduces the cost.

[0055] The PTFE outer lining protective layer 4 is tightly fitted to the upper surface of the first flange 2 and the outer wall of the vertical insertion tube 1 through a heating extrusion process; the PTFE inner lining protective layer 5 is tightly fitted to the end face of the second flange 3 and the inner wall of the vertical insertion tube 1 through a heating extrusion process.

[0056] The vertical insertion tube 1 is a carbon steel tube with an inner diameter of 25-40 mm and a tube wall of 3-4 mm, and the outlet end of the vertical insertion tube 1 is a 45° bevel cut, which greatly reduces the cost compared to the existing acid injection mixer made of all nickel-based metal.

[0057] The vertical insertion tube 1, the first flange 2 and the second flange 3 in the embodiment of the present invention are all made of ordinary carbon steel (10 yuan / Kg), which greatly reduces the cost compared with the existing acid injection mixer made of all nickel-based metal (700-800 yuan / Kg).

[0058] The present invention can achieve the situation that the acid injection mixer structure will not be corroded under any concentration and temperature conditions of concentrated sulfuric acid water injection dilution, thereby ensuring long-term normal and stable operation of the device.

[0059] [Example 2]

[0060] The embodiment of the present invention provides a method for preparing an acid injection mixing tube, which specifically includes:

[0061] Weld the first flange 2 to the outer wall of the middle part of the vertical insertion tube 1, weld the second flange 3 to the end of the inlet end of the vertical insertion tube 1, and clean the inner and outer surfaces;

[0062] The PTFE outer lining protective layer 4 and the PTFE inner lining protective layer 5 are respectively closely attached to the outer wall and the inner wall of the vertical insertion tube 1 by using a heating extrusion process, and the PTFE outer lining protective layer 4 needs to cover the upper surface of the first flange 2 by a flanging process, and the PTFE inner lining protective layer 5 needs to cover the end surface of the second flange 3 by a flanging process;

[0063] Finally, the PTFE outer lining protective layer 4 and the PTFE inner lining protective layer 5 are tightly fused by welding at one end of the 145° cut of the vertical insertion tube, thereby forming a fully wrapped PTFE isolation layer.

[0064] The fully wrapped PTFE isolation layer is used to completely isolate the sulfuric acid solution from the inner and outer walls of the acid injection mixing pipe, which can ensure the normal operation of the device throughout its life cycle while greatly reducing procurement costs.

[0065] The present invention can achieve the situation that the acid injection mixer structure will not be corroded under any concentration and temperature conditions of concentrated sulfuric acid water injection dilution, thereby ensuring long-term normal and stable operation of the device.

[0066] [Example 3]

[0067] The embodiment of the present invention provides an acid injection mixer, such as Figure 2 As shown, including:

[0068] A horizontal connecting pipe 6, wherein a hole is formed on the middle wall of the horizontal connecting pipe 6, and a vertical pipe 7 is vertically extended outward along the edge of the hole on the horizontal connecting pipe 6, and the inner walls of the horizontal connecting pipe 6 and the vertical pipe 7 are both provided with a tetrafluoroethylene protective layer;

[0069] The acid injection mixing tube is inserted into the vertical pipe 7 and extends into the horizontal connecting pipe 6. The central axis of the acid injection mixing tube coincides with the central axis of the vertical pipe 7, and the central axis of the acid injection mixing tube is perpendicular to the central axis of the horizontal connecting pipe 6.

[0070] The acid injection mixing tube, such as Figure 1 As shown, it includes: a vertical insertion tube 1, a first flange 2 arranged on the outer wall of the middle part of the vertical insertion tube 1 and a second flange 3 arranged at the end of the inlet end of the vertical insertion tube 1; the vertical insertion tube 1 is a carbon steel tube with an inner diameter of 25-40 mm and a tube wall of 3-4 mm, and the outlet end of the vertical insertion tube 1 is a 45° bevel cut; a PTFE outer lining protective layer 4 is arranged on the upper surface of the first flange 2 and on the outer wall of the vertical insertion tube 1 between the first flange 2 and the outlet end of the vertical insertion tube 1; a PTFE inner lining protective layer 5 is arranged on the inner wall of the vertical insertion tube 1 and on the end surface of the second flange 3 flush with the vertical insertion tube 1; the PTFE outer lining protective layer 4 and the PTFE inner lining protective layer 5 are welded and fused on the end surface of the outlet end of the vertical insertion tube 1, thereby forming a fully wrapped PTFE isolation layer. The fully wrapped PTFE isolation layer is 3-4 mm, so that the inner wall, outer wall of the vertical insertion tube 1, the upper surface of the first flange 2 and the end surface of the second flange 3 are all wrapped with PTFE, which enhances the anti-corrosion effect, further extends the service life and reduces costs.

[0071] The PTFE outer lining protective layer 4 is tightly fitted to the upper surface of the first flange 2 and the outer wall of the vertical insertion tube 1 through a heating extrusion process; the PTFE inner lining protective layer 5 is tightly fitted to the end face of the second flange 3 and the inner wall of the vertical insertion tube 1 through a heating extrusion process.

[0072] Furthermore, the preparation method of the acid injection mixing tube specifically includes:

[0073] Weld the first flange 2 to the outer wall of the middle part of the vertical insertion tube 1, weld the second flange 3 to the end of the inlet end of the vertical insertion tube 1, and clean the inner and outer surfaces;

[0074] The PTFE outer lining protective layer 4 and the PTFE inner lining protective layer 5 are respectively closely attached to the outer wall and the inner wall of the vertical insertion tube 1 by using a heating extrusion process, and the PTFE outer lining protective layer 4 needs to cover the upper surface of the first flange 2 by a flanging process, and the PTFE inner lining protective layer 5 needs to cover the end surface of the second flange 3 by a flanging process;

[0075] Finally, the PTFE outer lining protective layer 4 and the PTFE inner lining protective layer 5 are tightly fused by welding at one end of the 145° cut of the vertical insertion tube, thereby forming a fully wrapped PTFE isolation layer.

[0076] The present invention provides a tetrafluoroethylene protective layer on the inner walls of the horizontal connecting pipe 6 and the vertical pipe 7, and provides a fully wrapped PTFE isolation layer on the vertical insertion pipe, so as to completely isolate the horizontal connecting pipe 6, the vertical pipe 7 and the vertical insertion pipe 1 from the sulfuric acid solution, thereby ensuring the normal operation of the device throughout its life cycle while greatly reducing the procurement cost.

[0077] The present invention can achieve the situation that the acid injection mixer structure will not be corroded under any concentration and temperature conditions of concentrated sulfuric acid water injection dilution, thereby ensuring long-term normal and stable operation of the device.

[0078] Among them, the horizontal connecting pipe 6, the vertical pipeline 7 and the acid injection mixing pipe are all made of ordinary carbon steel, which greatly reduces the cost compared with the existing acid injection mixer made of all nickel-based metal.

[0079] [Example 4]

[0080] Referring to Example 3, a third flange 8 is provided at the inlet end of the vertical pipe 7, and the end face of the third flange 8 is flush with the end face of the vertical pipe 7. A tetrafluoroethylene protective layer is also provided on the end face of the third flange 8 flush with the vertical pipe 7 to prevent concentrated sulfuric acid from corroding the interface between the vertical pipe 7 and the third flange 8, thereby enhancing the anti-corrosion effect, further extending the service life, and reducing costs.

[0081] The third flange 8 is made of ordinary carbon steel, which greatly reduces the cost compared with the existing acid injection mixer made of all nickel-based metal.

[0082] The first flange 2 and the third flange 8 are fixed and sealed by screws. Since a tetrafluoroethylene protective layer is provided on the upper surface of the first flange and the lower surface of the third flange, concentrated sulfuric acid is prevented from corroding the first flange and the second flange, the anti-corrosion effect is enhanced, the service life is further extended, and the cost is reduced.

[0083] After the acid injection mixer of the present invention is adopted in a phenol acetone device, since a fully wrapped PTFE isolation layer is provided on the acid injection mixing pipe, and a tetrafluoroethylene protective layer is provided on the inner wall of the horizontal connecting pipe and the vertical pipe, the device has good corrosion resistance to sulfuric acid solution, thereby ensuring the normal and stable operation of the device. So far, there has been no economic loss caused by corrosion of the acid injection mixer structure.

[0084] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0086] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. An acid injection mixing tube, characterized in that: include: A vertical insertion tube, a first flange disposed on the outer wall of the middle portion of the vertical insertion tube, and a second flange disposed at the end of the inlet end of the vertical insertion tube; A PTFE outer lining protective layer is provided on the upper surface of the first flange and on the outer wall of the vertical insertion tube between the first flange and the outlet end of the vertical insertion tube; A PTFE lining protective layer is provided on the inner wall of the vertical insertion tube and on the end surface of the second flange flush with the vertical insertion tube; The PTFE outer lining protective layer and the PTFE inner lining protective layer are welded and fused on the end surface of the outlet end of the vertical insertion tube, thereby forming a fully wrapped PTFE isolation layer.

2. The acid injection mixing tube according to claim 1, characterized in that: The fully wrapped PTFE isolation layer is 3-4 mm.

3. The acid injection mixing tube according to claim 1, characterized in that: The vertical insertion tube is a carbon steel tube with an inner diameter of 25-40 mm and a tube wall of 3-4 mm, and the outlet end of the vertical insertion tube is a 45° oblique cut.

4. The acid injection mixing tube according to claim 1, characterized in that: The PTFE outer lining protective layer is tightly attached to the upper surface of the first flange and the outer wall of the vertical insertion tube through a heating extrusion process.

5. The acid injection mixing tube according to claim 1, characterized in that: The PTFE lining protective layer is tightly attached to the second flange end face and the inner wall of the vertical insertion tube through a heating extrusion process.

6. A method for preparing an acid injection mixing tube as claimed in any one of claims 1 to 5, characterized in that: Specifically include: Welding the first flange to the outer wall of the middle part of the vertical insertion tube, and welding the second flange to the end of the inlet end of the vertical insertion tube; The PTFE outer lining protective layer and the PTFE inner lining protective layer are respectively tightly attached to the outer wall and the inner wall of the vertical insertion tube by using a heating extrusion process; Finally, the PTFE outer lining protective layer and the PTFE inner lining protective layer are tightly fused by welding at one end of the 45° cut at the vertical insertion end, thereby forming a fully wrapped PTFE isolation layer.

7. The method for preparing an acid injection mixing tube according to claim 6, characterized in that: When the PTFE outer lining protective layer and the PTFE inner lining protective layer are tightly attached to the outer wall and inner wall of the vertical insertion tube by using a heating extrusion process, the PTFE outer lining protective layer is flanged to cover the upper surface of the first flange, and the PTFE inner lining protective layer is flanged to cover the end surface of the second flange.

8. An acid injection mixer, characterized in that: include: A horizontal connecting pipe, wherein a hole is opened on the middle pipe wall of the horizontal connecting pipe, and the edge of the hole on the horizontal connecting pipe vertically extends outward to form a vertical pipe, and the inner walls of the horizontal connecting pipe and the vertical pipe are both provided with a tetrafluoroethylene protective layer; The acid injection mixing tube according to any one of claims 1 to 5 is inserted into the vertical pipeline and extends into the horizontal connecting pipe.

9. The acid injection mixer according to claim 8, characterized in that: A third flange is provided at the inlet end of the vertical pipe, the end face of the third flange is flush with the end face of the vertical pipe, and a tetrafluoroethylene protective layer is also provided on the end face of the third flange flush with the vertical pipe.

10. The acid injection mixer according to claim 9, characterized in that: The first flange and the third flange are fixedly connected by screws.

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