Catalyst supporting structure of reactor

Abstract

The utility model relates to a catalyst support structure of reactor, including outer restraint cylinder subassembly and be located in the inner cylinder of outer restraint cylinder subassembly, outer restraint cylinder subassembly includes a plurality of strip-shaped arc-shaped plate, all arc-shaped plate vertically set up and connect on the inner wall of shell, along the circumferential direction of shell in proper order, be equipped with first air hole on the arc-shaped plate, be equipped with second air hole on the arc-shaped plate. A second air hole is formed in the inner cylinder, the cross section of each arc-shaped plate is in a C shape, a C-shaped opening of each arc-shaped plate faces the inner wall of the shell and abuts against the inner wall of the shell through the edges of the two opposite side walls of the arc-shaped plate, and a gap channel allowing reaction gas to pass through is formed in a gap between each arc-shaped plate and the inner wall of the shell; and a filling space for filling a catalyst is formed by a space between the outer wall, back to the C-shaped opening, of each arc-shaped plate and the outer wall of the inner cylinder. The structure of the outer restraining cylinder in the prior art is simplified, the catalyst supporting structure is convenient to disassemble and assemble, and the stability and firmness of the catalyst supporting structure are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of reactor equipment, in particular to a catalyst supporting structure of a reactor. Background Art

[0002] Fixed bed reactors can be divided into axial reactors, radial reactors and axial radial reactors according to the fluid flow pattern. In the axial reactor, the gas enters from the top, passes through the catalyst bed axially from top to bottom, and the reacted gas leaves the reactor from the lower outlet; in the radial reactor, the gas enters from the top, enters the catalyst through the gas distributor between the bed and the reactor, passes through the catalyst bed radially, and finally leaves the reactor through the internal collector; in the axial radial reactor, after the gas enters from the top gas inlet, the main gas flow passes through the gap formed by the shell and the second gas distributor, then passes through the bed radially, enters the central tube and leaves the reactor, and the other part of the gas flow still enters the top of the bed axially, flows for a distance, enters the central tube and leaves the reactor.

[0003] For example, the Chinese invention patent with application number CN201310048859.5 (authorization announcement number: CN103071431B) discloses "An axial radial reactor structure for sulfur-resistant conversion process", including: a shell, a gas inlet is provided at the top of the shell, and a gas outlet is provided at the bottom of the shell; the reactor structure also includes: a first gas distributor, arranged in the shell, for redistributing the gas flow entering the shell, the inlet of the first gas distributor is connected to the gas inlet; a second gas distributor, arranged in the shell, for redistributing the gas flow entering the shell for a second time, so that the gas flow enters the catalyst bed evenly; the second gas distributor includes an outer cylinder of a cylindrical structure and two gas distribution ports respectively arranged on the upper and lower parts of the outer cylinder. The outer cylinder is provided with air holes, the middle of the bottom plate is provided with a connecting hole, and the bottom plate is located on the first insulation layer; the first insulation layer is composed of refractory balls filled at the bottom of the shell; there is a gap between the outer cylinder and the inner wall of the shell; the gas collector is sleeved in the outer cylinder and used to collect the gas flow after the reaction, including an inner cylinder and a cover arranged on the upper port of the inner cylinder, the lower port of the inner cylinder is connected to the gas outlet through the connecting hole, and the inner cylinder is provided with an air inlet hole; there is a gap between the cover and the cover; the grid is radially arranged in the shell, located above the second gas distributor, and the grid and the cover are filled with a second insulation layer composed of refractory balls. The catalyst is filled in the gap between the second gas distributor and the gas collector. The inner wall of the outer cylinder and the outer wall of the inner cylinder are both provided with a wire mesh for stopping the catalyst.

[0004] The catalyst support structure of the reactor in the above patent (i.e., formed by the second gas distributor and the gas collector) still has certain shortcomings. First, the second gas distributor of the prior art is a cylinder section with a diameter slightly smaller than the inner diameter of the reactor, and the bottom is directly welded to the support ring. The pressure-bearing shell of the reactor needs to be subjected to stress relief heat treatment after welding. Because the diameter of the cylinder section is large, the welding of the cylinder section and the equipment must be completed before the reactor closes the weld, so the cylinder section needs to be heat treated in the furnace together with the reactor. The wall thickness of the cylinder section is relatively thin relative to the thickness of the shell, which is easy to cause deformation of the cylinder section during the furnace heat treatment, affecting the gas distribution and reducing the reaction efficiency. Heat treatment of the cylinder section together with the shell also reduces the corrosion resistance of the cylinder section. Secondly, the wall thickness of the cylinder section is relatively thick, so the aperture of the opening is also large, and a wire mesh must be laid on its surface. However, due to the low strength of the wire mesh, once the wire mesh is broken, the catalyst will leak into the annular gap between the outer cylinder and the inner wall of the shell, blocking the process channel, seriously affecting the normal operation of the device, and causing the product to fail to meet the standards. Thirdly, the cylinder section is an integral structure, and the size of the cylinder section is much larger than the size of the gas inlet of the reactor, so it is impossible to enter from the gas inlet. Once the cylinder section is corroded or damaged, it is difficult to replace. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a catalyst support structure which is firmly fixed and thus improves the operating stability of the equipment in view of the current status of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide a catalyst support structure of a reactor which is convenient for disassembly and assembly in view of the current status of the prior art.

[0007] The technical solution adopted by the utility model to solve any of the above-mentioned technical problems is: a catalyst support structure of a reactor, arranged in the shell of the reactor, including an outer constraint tube assembly and an inner tube located in the outer constraint tube assembly, the outer constraint tube assembly including a plurality of long arc-shaped plates, each arc-shaped plate is vertically arranged and connected to the inner wall of the above-mentioned shell, and is arranged in sequence along the circumference of the shell, the arc-shaped plate is provided with a first air hole, the inner tube is provided with a second air hole, the cross-section of the arc-shaped plate is C-shaped, the C-shaped opening of the arc-shaped plate faces the inner wall of the shell and the edges of the two opposite side walls of the arc-shaped plate are pressed against the inner wall of the shell, the gap between each of the arc-shaped plates and the inner wall of the shell forms a gap channel for the reaction gas to pass through, and the space between the outer wall of each arc-shaped plate facing away from the C-shaped opening and the outer wall of the inner tube forms a filling space for filling the catalyst.

[0008] As an improvement, the arc-shaped plate is welded to the shell.

[0009] As an improvement, the arc-shaped plate is connected to the shell via a hook.

[0010] As an improvement, the first air hole is an elongated hole, and the width of the elongated hole is ≥1.5 mm.

[0011] As an improvement, the opening rate of the arc-shaped plate is 10% to 30%.

[0012] As an improvement, the thickness of the arc-shaped plate is 1.5 mm to 6 mm.

[0013] As an improvement, the second air hole is a circular hole, and the diameter of the second air hole is 6-15 mm.

[0014] As an improvement, the inner cylinder is a metal round tube, and the opening rate of the inner cylinder is 0.5% to 10%.

[0015] Compared with the prior art, the utility model has the following advantages: the outer constraint cylinder assembly is formed by a plurality of vertically arranged arc plates arranged in sequence along the circumferential direction, and the structure of assembling a plurality of arc plates is adopted, which is convenient for operators to disassemble and assemble the catalyst support structure, wherein, when each arc plate is corroded or damaged, it is correspondingly disassembled for repair or replacement, which is convenient and quick, and does not need to replace the outer constraint cylinder as a whole as in the prior art. On the other hand, the gap between each of the arc plates and the inner wall of the shell in the utility model forms a gap channel for the reaction gas to pass through, and the space between the outer wall of each arc plate facing away from the C-shaped opening and the outer wall of the inner cylinder forms a filling space for filling the catalyst. This structural setting simplifies the existing catalyst support structure, and because the edges of the two side walls of the arc plate are against the inner wall of the shell, the wall thickness can be greatly reduced, so that the small aperture forming of the pores can be realized (such as by laser cutting process), avoiding the use of multi-layer wire mesh in the prior art, simplifying the installation process, reducing equipment investment, and improving the stability of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the reactor;

[0017] Figure 2 A cross-sectional view of a catalyst support structure of a reactor according to an embodiment of the present utility model;

[0018] Figure 3 It is a schematic diagram of the partial structure of the catalyst support structure of the reactor according to an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] See also Figure 1The reactor, such as the axial radial reactor, generally includes a shell 10, a gas distributor 11, a grid 12 and a catalyst support structure. The gas distributor 11, the grid 12 and the catalyst support structure are all arranged in the shell 10. A gas inlet 14 is provided at the top of the reactor shell 10, and a gas outlet 15 is provided at the bottom. The gas distributor 11 is located at the gas inlet 14 position of the shell 10, and is used to redistribute the gas flow entering the shell 10. The catalyst support structure is located below the gas distributor 11. The grid 12 is radially arranged in the shell 10, and is located above the catalyst support structure.

[0021] like Figure 2 and Figure 3 The catalyst support structure of a reactor of this embodiment is shown, including an outer constraint cylinder assembly and an inner cylinder 30. The outer constraint cylinder assembly is a plurality of long arc plates 21, each arc plate 21 is vertically arranged and connected to the inner wall of the shell 10, and is arranged in sequence along the circumference of the shell 10.

[0022] See also Figure 2 , the arc plate 21 of this embodiment is fixedly arranged relative to the shell 10. Specifically, the upper end of the arc plate 21 can be positioned by hooking, spot welding, etc., and the lower end of the arc plate 21 can be supported on a support ring (not shown) pre-welded at the bottom of the shell 10. The cross section of the arc plate 21 of this embodiment is C-shaped, and the C-shaped opening of the arc plate 21 faces the inner wall of the shell 10, and the edges of the two opposite side walls of the arc plate 21 are against the inner wall of the shell 10 to form a stable support. Similarly, in this embodiment, each arc plate 21 is arranged in sequence along the circumference of the shell, and correspondingly, the gap between each arc plate 21 and the inner wall of the shell 10 forms a gap channel 40 for the reaction gas to pass through, wherein two adjacent arc plates 21 in each arc plate 21 can be arranged closely or with a slight gap. The space between the outer wall of each arc plate 21 facing away from the C-shaped opening and the outer wall of the inner cylinder 30 forms a filling space 20 for filling the catalyst.

[0023] The thickness of the arc plate 21 of the present embodiment is 1.5 mm to 6 mm. A plurality of first air holes (not shown) are provided on the arc plate 21, wherein the first air holes of the present embodiment can be long strip holes, and the width of the long strip holes is ≥ 1.5 mm. Specifically, the first air holes can be arranged in a rectangular, triangular or involute shape, wherein the opening rate of the arc plate 21 is 10% to 30%.

[0024] See also Figure 2The inner cylinder 30 is located inside the outer constraint cylinder assembly composed of multiple arc-shaped plates 21. A plurality of second air holes (not shown) are provided on the wall of the inner cylinder 30, and the second air holes can be arranged in a triangle or square. The inner cylinder 30 is a metal round tube, and the second air holes are circular holes with a diameter of 6-15 mm. The opening rate of the inner cylinder 30 is 0.5% to 10%. The inner cylinder 30 is used to collect the post-reaction gas flow, and the lower port of the inner cylinder 30 is connected to the gas outlet 15.

[0025] Combination Figure 1 and Figure 2 , the reaction gas from upstream enters the reactor from the gas inlet 14, a part of the gas passes through the gas distributor 11 and enters the gap channel 40 formed by the shell 10 and the arc plates 21, and then enters the catalyst bed 16 radially through the first air holes of the arc plates 21, and the gas passing through the catalyst bed 16 enters the inner cylinder 30 through the second air holes, and finally exits the reactor through the gas outlet 15. Another part of the gas enters the catalyst bed 16 axially, flows along the axial direction of the bed, enters the inner cylinder 30 through the second air holes, and finally exits the reactor through the gas outlet 15.

[0026] Advantages of the catalyst support structure of the reactor of the present embodiment: the outer restraint tube assembly of the present embodiment is formed by only a plurality of arc-shaped plates 21, which simplifies the structure of the outer restraint tube in the prior art and facilitates the assembly and disassembly of the catalyst support structure. The opposite side walls of the arc-shaped plates 21 themselves can rest against the inner wall of the shell 10, which simplifies the catalyst support structure while ensuring the stability and reliability of the catalyst support structure.

Claims

1. A catalyst support structure of a reactor, arranged in a shell (10) of the reactor, characterized in that: The invention comprises an outer constraint cylinder assembly and an inner cylinder (30) located in the outer constraint cylinder assembly, wherein the outer constraint cylinder assembly comprises a plurality of long arc-shaped plates (21), each of the arc-shaped plates (21) is vertically arranged and connected to the inner wall of the shell (10), and is arranged in sequence along the circumference of the shell (10), and a gap is provided between two adjacent arc-shaped plates (21) in each of the arc-shaped plates (21), a first air hole is provided on the arc-shaped plate (21), a second air hole is provided on the inner cylinder (30), and the arc-shaped plates (21) are provided with a plurality of long arc-shaped plates (21). ) has a C-shaped cross section, the C-shaped opening of the arc plate (21) faces the inner wall of the shell (10) and the edges of the two opposite side walls of the arc plate (21) abut against the inner wall of the shell (10), the gap between each of the arc plates (21) and the inner wall of the shell (10) forms a gap channel (40) for the reaction gas to pass through, and the space between the outer wall of each of the arc plates (21) facing away from the C-shaped opening and the outer wall of the inner tube (30) forms a filling space (20) for filling the catalyst.

2. The catalyst support structure of the reactor according to claim 1, characterized in that: The arc-shaped plate (21) is welded to the shell (10).

3. The catalyst support structure of the reactor according to claim 1, characterized in that: The arc-shaped plate (21) is connected to the housing (10) via a hook.

4. The catalyst support structure of the reactor according to claim 1, characterized in that: The first pores are long strip-shaped holes, and the width of the long strip-shaped holes is ≥1.5 mm.

5. The catalyst support structure of the reactor according to claim 4, characterized in that: The opening rate of the arc-shaped plate (21) is 10% to 30%.

6. The catalyst support structure of the reactor according to claim 4, characterized in that: The thickness of the arc-shaped plate (21) is 1.5 mm to 6 mm.

7. The catalyst support structure of a reactor according to any one of claims 1 to 6, characterized in that: The second air hole is a circular hole, and the diameter of the second air hole is 6-15 mm.

8. The catalyst support structure of a reactor according to any one of claims 1 to 6, characterized in that: The inner cylinder (30) is a metal round tube, and the opening rate of the inner cylinder (30) is 0.5% to 10%.

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