CN214415622U

CN214415622U - Corrosion-resistant layer structure of connecting pipe position on high-medium pressure flash tank

Info

Publication number: CN214415622U
Application number: CN202023237721.4U
Authority: CN
Inventors: 杜震宇
Original assignee: Suzhou Hailu Heavy Industry Co Ltd
Current assignee: Suzhou Hailu Heavy Industry Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-10-19
Anticipated expiration: 2030-12-29

Abstract

The utility model discloses a take over corrosion-resistant layer structure of position on high-and-medium-pressure flash tank, take over welded fastening on the casing, be provided with the interior bushing pipe of corrosion-resistant alloy material on the inner wall of takeover, the inside lining layer that the build-up welding was provided with corrosion-resistant alloy material on the takeover inner wall of interior bushing pipe inner end, the inner liner include transition layer and covering layer, the covering layer build-up welding sets up outside the transition layer, the inner liner extends to shells inner wall inwards by the inner end of interior bushing pipe and covers outside the welding seam of takeover and casing, shells inner wall is last to be provided with and to ward off the plumbous layer, ward off the plumbous layer link up to the edge of inner liner, ward off the position that plumbous layer and inner liner linked up and be located the outside of the welding seam of takeover and casing, ward off plumbous layer and inner liner and be provided with the earthenware layer outward. The utility model has the advantages that: the phenomenon that the lead lining layer and the ceramic brick layer fall off is avoided, and the use stability of the flash tank is effectively improved.

Description

Corrosion-resistant layer structure of connecting pipe position on high-medium pressure flash tank

Technical Field

The utility model relates to a flash tank technical field, concretely relates to corrosion resistant layer structure in flash tank.

Background

With the continuous development of science and technology, nickel and nickel alloy are widely applied to a plurality of fields. The source of nickel is mainly by mining and refining of nickel ores. The high-pressure acid leaching process is to dissolve nickel, cobalt, iron, aluminum and the like in minerals by using sulfuric acid at the temperature of 250-270 ℃ and under the pressure of 4.0-5.0 MPa, and the leaching solution after solid-liquid separation is subjected to a series of process steps of neutralization, precipitation, purification, cobalt extraction and the like through flash tanks at all stages to separate nickel. Therefore, the inner surface of the flash tank is required to be resistant to high temperature, high pressure, and acid corrosion.

The corrosion resistant layer structure of current high and medium pressure flash tanks generally comprises: and the lead lining layer is arranged on the inner wall of the shell of the flash tank, and the ceramic brick is arranged on the outer side of the lead lining layer. The lead-lined layer is corrosion resistant, and the ceramic brick is acid resistant, high temperature resistant, high pressure resistant and wear resistant. The high-pressure flash tank is characterized in that a connecting pipe is arranged on a shell of the high-pressure flash tank, the connecting pipe is welded and fixed on the shell, a high-temperature-resistant and corrosion-resistant alloy lining pipe is arranged on the inner wall of the connecting pipe for high temperature resistance, high pressure resistance and acid corrosion resistance, a section of lead lining layer with the height of about 20mm is arranged at the bottom of the alloy lining pipe, and the lead lining layer at the bottom of the alloy lining pipe extends downwards to the inner wall of the shell through the bottom of the connecting pipe and a welding line.

During use of the high-medium pressure flash tank it was found that: the discontinuity between the connecting pipe and the shell easily causes stress concentration to generate higher peak stress, and the inner surface of the welding seam of the connecting pipe is added with a layer of lead lining layer through a high-temperature lead lining process, so that the stress concentration tendency of the welding seam is also improved. Under the cavitation of high temperature, high pressure and flash steam and the continuous scouring action of ore pulp, the welding position of the connecting pipe and the shell is easy to deform, so that a lead lining layer is cracked and a ceramic brick layer falls off, and further shutdown maintenance is realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the corrosion-resistant layer structure at the position of the connecting pipe on the high-medium pressure flash tank is stable in structure and long in service life.

In order to achieve the above object, the utility model adopts the following technical scheme: the anti-corrosion layer structure of takeover position on the high-medium pressure flash tank, takeover welded fastening on the casing, be provided with the interior bushing pipe of corrosion resistant alloy material on the inner wall of takeover, the build-up welding is provided with the inner liner of corrosion resistant alloy material on the takeover inner wall of interior bushing pipe inner end, the inner liner include transition layer and covering layer, the covering layer build-up welding sets up outside the transition layer, the inner liner extends to shells inner wall inwards by the inner end of interior bushing pipe and covers outside the welding seam of takeover and casing, the last plumbous layer that is provided with of shells inner wall, plumbous layer link up to the edge of inner liner, the position that plumbous layer and inner liner link up is located the outside of the welding seam of takeover and casing, it is provided with the ceramic brick layer outward to ward plumbous layer and inner liner.

Further, in the corrosion-resistant layer structure at the position of the connecting pipe on the high-medium pressure flash tank, the end face of the lead lining layer is in inclined plane connection with the edge of the lining layer by 30 degrees.

Further, in the corrosion-resistant layer structure at the position of the connecting pipe on the high-medium pressure flash tank, the length of the lining layer between the inner end of the connecting pipe and the lining pipe is 50 mm.

Furthermore, the corrosion-resistant layer structure at the position of the connecting pipe on the high-medium pressure flash tank comprises 2-3 ceramic brick layers.

Further, in the corrosion-resistant layer structure at the connecting pipe position on the high-medium pressure flash tank, the brick joints of two adjacent ceramic bricks on each layer and the brick joints between two adjacent ceramic bricks on one layer are staggered.

Further, in the corrosion-resistant layer structure at the upper connecting pipe position of the high-medium pressure flash tank, the lining pipe, the transition layer and the cover surface layer are made of the same material and are made of H06625 alloy.

The utility model has the advantages that: the transition layer is welded on the connecting pipe and the welding seam of the connecting pipe and the shell, stress eliminating treatment is carried out after the transition layer is welded, so that welding stress can be effectively eliminated, the stability of the transition layer is effectively improved, cracking and deformation can be avoided under the severe working condition, the phenomenon that a lead layer and a ceramic brick layer fall off is avoided, and the use stability of the flash tank is effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of an erosion resistant layer structure at a connecting pipe position on the high-medium pressure flash tank of the present invention.

Detailed Description

The invention will be described in further detail with reference to the drawings and preferred embodiments.

As shown in figure 1, the connecting pipe 1 is welded and fixed on a shell 2 in the corrosion-resistant layer structure at the connecting pipe position on the high-medium pressure flash tank. Be provided with the interior bushing 3 of corrosion resistant alloy material on the inner wall of takeover 1, the build-up welding is provided with the inside lining 4 layers of corrosion resistant alloy material on the inner wall of the takeover 1 of interior bushing 3 inner end, inside lining 4 include transition layer 41 and cover surface layer 42, cover surface layer 42 build-up welding sets up outside transition layer 41. In this embodiment, the length d of the inner liner 4 from the inner end of the adapter tube 1 to the inner liner tube 3 is 50 mm.

The lining pipe 3, the transition layer 41 and the cover surface layer 42 are made of the same material and are made of H06625 alloy.

The lining layer 4 extends inwards from the inner end of the lining pipe 3 to the inner wall of the shell 2 and covers the welding seam 6 between the adapter pipe 1 and the shell 2. Be provided with on casing 2's the inner wall and ward off lead layer 21, ward off lead layer 21 link up to the edge of inner liner 4 on the casing 2 inner wall, ward off the position that lead layer 21 and inner liner 4 link up and be located the outside of taking over 1 and casing 2's welding seam 6, ward off the terminal surface that the lead layer 21 was ward off to the position department that lead layer 21 and inner liner 4 linked up in this embodiment and be 30 inclined planes with the edge of inner liner 4. An earthenware brick layer 5 is arranged outside the lead lining layer 21 and the inner lining layer 4. Typically the ceramic brick layer 5 of the high pressure flash tank is three layers and the ceramic brick layer 5 of the medium pressure flash tank is two layers. The brick joints 51 of two adjacent ceramic bricks on each layer and the brick joints between two adjacent ceramic bricks on one layer are staggered.

When in processing and manufacturing, the end surface of the inner side corner of the connecting pipe 1 is firstly polished into a round corner, the welding seam 6 is polished and leveled and is in smooth transition with the shell 2, then the transition layer 41 is surfacing welded, and after surfacing welding of the transition layer 41 is finished, stress relief heat treatment is carried out; then the lining pipe 3 is installed, and the cover surface layer 42 is overlaid outside the transition layer 41 and is welded and connected with the lining pipe 3. The stress relief heat treatment is not performed after the overlaying of the cover layer 42 is completed, so that the corrosion resistance of the H06625 alloy material is prevented from being reduced by the heat treatment. Then the inner wall of the shell is integrally enameled with lead. The end surface 43 of the lining layer 4 engaged with the lead lining layer 21 is polished to a 30 ° slope in advance to facilitate the effective connection of the lead lining layer 21. And after the lead lining layer 21 is finished, the ceramic brick layer 5 is installed.

Because the transition layer 41 is welded on the positions of the connecting pipe 1 and the welding seam 6 between the connecting pipe 1 and the shell 2, and stress relief treatment is carried out after the welding of the transition layer 41 is finished, welding stress can be effectively eliminated, so that the stability of the transition layer 41 is effectively improved, cracking and deformation can be avoided under severe working conditions, the phenomenon that the lead lining layer 21 and the ceramic brick layer 5 fall off is avoided, and the use stability of the flash tank is effectively improved.

Claims

1. The anti-corrosion layer structure of takeover position on the high-medium pressure flash tank, takeover welded fastening on the casing, its characterized in that: be provided with the interior bushing pipe of corrosion resistant alloy material on the inner wall of takeover, the build-up welding is provided with the inner liner of corrosion resistant alloy material on the takeover inner wall of interior bushing pipe inner end, the inner liner include transition layer and capping layer, the capping layer build-up welding sets up outside the transition layer, the inner liner by the inner end of interior bushing pipe extend to shells inner wall inwards to the cover outside the welding seam of takeover and casing, be provided with on the shells inner wall and warded off the lead layer, warded off the lead layer link up to the edge of inner liner, warded off the lead layer and lie in the outside of the welding seam of takeover and casing with the position that the inner liner links up, warded off the lead layer and be provided with acidproof, high temperature resistant and wear-resisting earthenware brick layer outward with the inner liner.

2. The corrosion resistant layer structure at the location of the adapter tube on the high and medium pressure flash tank of claim 1 wherein: the end face of the lead-lined layer is connected with the edge of the lining layer in a 30-degree inclined plane.

3. The corrosion resistant layer structure at the location of the adapter on the high and medium pressure flash tank as claimed in claim 1 or 2, wherein: the length of the lining layer between the inner end of the connecting pipe and the lining pipe is 50 mm.

4. The corrosion resistant layer structure at the location of the adapter on the high and medium pressure flash tank as claimed in claim 1 or 2, wherein: the ceramic brick layer is 2 ~ 3 layers.

5. The corrosion resistant layer structure at the location of the adapter tube on the high and medium pressure flash tank of claim 4 wherein: the brick joints of two adjacent ceramic bricks on each layer and the brick joints between two adjacent ceramic bricks on one layer are staggered.

6. The corrosion resistant layer structure at the location of the adapter on the high and medium pressure flash tank as claimed in claim 1 or 2, wherein: the lining pipe, the transition layer and the cover surface layer are made of the same material and are made of H06625 alloy.