CN212549491U

CN212549491U - Conversion device for polyvinyl chloride

Info

Publication number: CN212549491U
Application number: CN202021049771.7U
Authority: CN
Inventors: 李洪川; 王倩; 孙爱荣; 李俊松
Original assignee: Hubei Changfa Vessel Manufacturing Co ltd
Current assignee: Hubei Changfa Vessel Manufacturing Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-02-19
Anticipated expiration: 2030-06-10

Abstract

The utility model provides a conversion equipment for polyvinyl chloride. The device is characterized in that an annular anti-impact plate is arranged at a medium inlet at the lower part of a transfer device, a large baffle plate and a small baffle plate are respectively arranged in a converter, a heat exchange tube respectively penetrates through the large baffle plate and the small baffle plate, and the large baffle plate and the small baffle plate in the converter form a baffle plate group. The annular impingement baffle is formed by welding a circle of vertical annular impingement baffle on the lower part of the horizontal annular impingement baffle, the sealing plates on the peripheral edges of the horizontal annular impingement baffle are welded on the cylinder walls of the horizontal annular impingement baffle and the converter respectively, and an acceleration hole is formed in the center of an equilateral triangle formed by three heat exchange tubes on the large baffle plate and the small baffle plate. The device can improve the flow velocity of fluid in the shell pass, so that the fluid flows longitudinally, the heat transfer temperature difference pushing is large, and the heat transfer of the shell pass is enhanced, thereby achieving the effect of quickly improving the temperature of the catalyst used in the tube pass of the conversion device.

Description

Conversion device for polyvinyl chloride

Technical Field

The utility model relates to petrochemical equipment field, in particular to a conversion equipment for polyvinyl chloride.

Background

Plastic materials (PVC) are one of the most widely used plastics in the world, and have the advantages of nonflammability, high strength, weather resistance and excellent geometric stability. China is the largest PVC producing country and consuming country in the world, 80% of enterprises use the production process of PVC by calcium carbide method, and the method uses mercury chloride catalyst (mercury catalyst) in the reaction process. With the formal effect of the Water guarantee convention in China, the use of the mercury catalyst in China gradually exits from the historical stage, and a plurality of other novel catalysts are present to replace the mercury catalyst to react in a vinyl chloride converter, but the reaction temperature of the novel catalysts is higher than that of the mercury catalyst to meet the use requirement, so that the conventional polyvinyl chloride converter cannot meet the use and reaction conditions of the novel catalysts.

Currently, the baffles generally installed in the existing converter 5 are a left baffle 13 and a right baffle 14, the left baffle 13 and the right baffle 14 are arch baffles 15, and an impingement plate is not installed at the medium inlet 1 of the converter 5, and a medium fluid enters the converter 5 to directly flush the heat exchange pipe 3, and the specific structure of the existing converter 5 is shown in fig. 9. When the arched baffle plate 15 is used in the converter 5, heat exchange dead zones are easily generated by the medium flow in the converter 5, particularly in the converter 5 with multiple inlets or/and multiple outlets on the shell side, a part of the medium fluid flows out from the cut part when passing through the medium outlet 4, the rest medium fluid flows out to other ports along the cylindrical wall of the converter 5, a central heat exchange dead zone 16 of the medium fluid is generated at the center of the converter 5, the specific flow direction of the medium fluid in the existing converter 5 is shown in figure 10, and therefore the installation structure of the converter 5 directly influences the heat exchange efficiency of the central area of the converter 5. Therefore, how to design and manufacture a converter satisfying the new catalytic reaction conditions becomes an important issue for the research of the present design institute and manufacturing factory.

Disclosure of Invention

An object of the utility model is to provide an adopt baffle group that big baffling board, little baffling board constitute to be equipped with the conversion equipment that is used for polyvinyl chloride of annular protecting against shock board at the medium entrance. The utility model discloses the technical problem that needs to solve does: 1. the heat exchange pipe is flushed when the medium enters the shell pass, and meanwhile, the flow direction of the medium in the conversion device can be changed, so that the medium flows upwards from the bottommost part of the shell pass, and the retention dead zone is reduced; 2. the flow velocity of the fluid in the shell pass is improved, the fluid flows longitudinally, the heat transfer temperature difference pushing is large, and the heat transfer of the shell pass is enhanced.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a conversion apparatus for polyvinyl chloride comprising: the device comprises a horizontal annular anti-impact plate, a heat exchange tube, a converter, a large baffle plate, a small baffle plate, a vertical annular anti-impact plate, a sealing plate and an acceleration hole, wherein the annular anti-impact plate is arranged at a medium inlet at the lower part of the converter, the upper part and the lower part in the converter are respectively provided with the large baffle plate, the middle part in the converter is provided with the small baffle plate, the heat exchange tube respectively penetrates through the large baffle plate and the small baffle plate, and the large baffle plate and the small baffle plate in the converter form a baffle.

The annular impingement baffle in the device is formed by welding a circle of vertical annular impingement baffle at the lower part of a horizontal annular impingement baffle, and the sealing plates at the peripheral edges of the horizontal annular impingement baffle are respectively welded on the horizontal annular impingement baffle and the cylinder wall of the converter.

On the large baffle plate and the small baffle plate in the device, the center of an equilateral triangle formed by three heat exchange tubes is provided with acceleration holes, and the number of the acceleration holes is determined according to the number of the equilateral triangles formed by the heat exchange tubes in the converter.

The utility model discloses an actively the effect does:

1. the device can meet the reaction temperature of a novel catalyst, and the shell pass structure of the existing converter is essentially improved by changing the mounting structure of the left baffle plate and the right baffle plate into the structure of a baffle plate group consisting of a large baffle plate and a small baffle plate;

2. the device reduces the scouring of the heat exchange pipe when the medium enters the shell side by installing the annular scour prevention plate at the medium inlet, and simultaneously can change the flow direction of the medium in the conversion device, so that the medium flows upwards from the bottommost part of the shell side, and the detention dead zone is reduced;

3. in an annular baffle group in a converter, the center of an equilateral triangle formed by three heat exchange tubes is provided with an accelerating small hole, so that the flow of a medium in the converter is accelerated, and the retention dead zone of the edge area of the baffle is reduced;

4. the device can improve the flow velocity of fluid in the shell pass, so that the fluid flows longitudinally, the heat transfer temperature difference pushing is large, and the heat transfer of the shell pass is enhanced, thereby achieving the effect of quickly improving the temperature of the catalyst used in the tube pass of the conversion device.

Drawings

FIG. 1 is a schematic view of the structure of a conversion plant for polyvinyl chloride;

FIG. 2 is a schematic view of an annular impingement plate installation;

FIG. 3 is a schematic top view of the annular impingement plate;

FIG. 4 is a partial enlarged structural view (A) of the annular impingement baffle;

FIG. 5 is a schematic medium flow diagram of a conversion plant for polyvinyl chloride;

FIG. 6 is a schematic view of a large baffle plate structure;

FIG. 7 is a schematic view of a small baffle plate structure;

FIG. 8 is a partially enlarged view (B) of the baffle plate;

FIG. 9 is a schematic diagram of a prior art converter;

FIG. 10 is a schematic view of a prior art converter media flow.

Wherein in the figure: 1. medium inlet, 2, horizontal annular impingement baffle, 3, heat exchange tube, 4, medium outlet, 5, converter, 6, big baffling board, 7, little baffling board, 8, vertical annular impingement baffle, 9, shrouding, 10, converter bottom plate, 11, cut out the district, 12, acceleration hole, 13, left baffling board, 14, right baffling board, 15, bow-shaped baffling board, 16, central heat transfer dead zone.

Detailed Description

The technical solution of the present invention will be further described clearly and completely with reference to the accompanying drawings.

Referring to the attached drawings 1-8, the device is provided with an annular baffle at a medium inlet 1 at the lower part of a converter 5, a large baffle 6 is respectively arranged at the upper part and the lower part in the converter 5, a small baffle 7 is arranged at the middle part in the converter 5, a heat exchange tube 3 respectively penetrates through the large baffle 6 and the small baffle 7, and the large baffle 6 and the small baffle 7 in the converter 5 form a baffle group.

The annular impingement baffle in the device is formed by welding a circle of vertical annular impingement baffle 8 at the lower part of a horizontal annular impingement baffle 2, and sealing plates 9 on the peripheral edges of the horizontal annular impingement baffle 2 are respectively welded on the horizontal annular impingement baffle 2 and the cylinder wall of the converter 5.

In the device, the center of an equilateral triangle formed by three heat exchange tubes 3 is provided with acceleration holes 12 on a large baffle plate 6 and a small baffle plate 7, and the number of the acceleration holes 12 is determined according to the number of the equilateral triangles formed by the heat exchange tubes 3 in the converter 5.

When the device is used, the medium fluid enters the converter 5 from the medium inlet 1, and after entering the converter 5, the medium fluid is blocked by the vertical annular impingement baffle 8 in the horizontal direction, so that the medium fluid cannot directly impact the heat exchange tube 3, and is blocked by the sealing plate 9 in the vertical direction, so that the medium fluid is forced to enter an inner space of the converter 5 along a gap between the vertical annular impingement baffle 8 and the converter bottom plate 10 (see fig. 4). The entered medium fluid goes upward through a cut-out area 11 in the center of the horizontal impingement plate 2, a part of the medium fluid going upward from the cut-out area 11 of the horizontal impingement plate 2 continues to go upward along the cut-out area 11 in the center of the large baffle plate 6, reaches the small baffle plate 7, goes upward through an accelerating hole 12 formed in the center of an equilateral triangle formed by the three heat exchange tubes 3 on the small baffle plate 7, exchanges heat with the heat exchange tubes 3 at the same time, and is discharged through a medium outlet 4 through the cut-out area 11 in the center of the large baffle plate 6 arranged on the upper portion of the converter 5. The other part of the medium fluid goes upward through an accelerating hole 12 formed in the center of an equilateral triangle formed by the three heat exchange tubes 3 on the large baffle plate 6 and the small baffle plate 7, exchanges heat with the heat exchange tubes 3 (the specific flow direction of the medium fluid is shown in figure 5), and is finally discharged through the medium outlet 4.

Claims

1. A conversion apparatus for polyvinyl chloride comprising: horizontal annular impingement baffle (2), heat exchange tube (3), converter (5), big baffling board (6), little baffling board (7), perpendicular annular impingement baffle (8), shrouding (9) and acceleration hole (12), its characterized in that: the device is characterized in that an annular anti-impact plate is arranged at a medium inlet (1) at the lower part of a converter (5), a large baffle plate (6) is arranged at the upper part and the lower part in the converter (5) respectively, a small baffle plate (7) is arranged at the middle part in the converter (5), a heat exchange tube (3) penetrates through the large baffle plate (6) and the small baffle plate (7) respectively, and the large baffle plate (6) and the small baffle plate (7) in the converter (5) form a baffle plate group.

2. The conversion plant for polyvinyl chloride according to claim 1, characterized in that: the annular impingement baffle in the device is formed by welding a circle of vertical annular impingement baffle (8) at the lower part of a horizontal annular impingement baffle (2), and sealing plates (9) on the peripheral edges of the horizontal annular impingement baffle (2) are respectively welded on the cylinder walls of the horizontal annular impingement baffle (2) and the converter (5).

3. The conversion plant for polyvinyl chloride according to claim 1, characterized in that: in the device, the center of an equilateral triangle formed by three heat exchange tubes (3) is provided with acceleration holes (12) on a large baffle plate (6) and a small baffle plate (7), and the number of the acceleration holes (12) is determined according to the number of the equilateral triangles formed by the heat exchange tubes (3) in the converter (5).