A hydrogenation reactor

Abstract

The utility model relates to a hydrogenation reactor, which is a large-scale tubular reactor; the distance between the center of the inlet and outlet cooling water interface of the hydrogenation reactor and the center of the butt annular seam between its cylinder and tube sheet is ≤300mm; the interface pipe constituting the inlet and outlet cooling water interface of the hydrogenation reactor is welded to the cylinder of the hydrogenation reactor; the welding groove at the welding point between the interface pipe and the cylinder of the hydrogenation reactor is an inner groove. Under the premise of not increasing the production cost, the deformation caused by welding stress is solved with the shortest process flow, and the equipment does not have the safety hazard of residual stress.

Description

Technical Field

[0001] The utility model relates to a reactor, in particular to a hydrogenation reactor. Background Art

[0002] The hydrogenation reactor is a large-scale tubular reactor. In order to fully exchange heat in a limited space, the medium flow is designed to be as long as possible. The inlet and outlet cooling water interfaces are very close to the upper and lower tube sheets while meeting the requirements of opening reinforcement. The distance from the center to the center of the annular seam between the tube sheet and the cylinder is about 300 mm. However, this design increases the difficulty of welding between the interface pipe and the cylinder, which can easily cause deformation of the cylinder (out-of-roundness) and make it impossible to assemble with the tube sheet.

[0003] In response to the above problems, there are two processes in the industry (the welding grooves are placed outside the cylinder, which is an external groove):

[0004] The cylinder body is thickened at the joint with the tube sheet. In order to ensure the machining allowance after welding, the cylinder wall thickness is generally thickened by 30mm. The height of the cylinder is about 600mm. After welding the pipe, it is put into the furnace for a heat treatment. After finalization, it is put on a vertical lathe to remove the deformation to ensure the roundness and effective thickness of the cylinder body, and then it is connected with the tube sheet. In this way, it can be ensured that after welding, the misalignment of the cylinder body and the tube sheet will not exceed the tolerance, so as to meet the requirements specified in the GB150 standard.

[0005] The welding of the interface pipe and the cylinder is completed in two steps. First, a part is welded, and a large amount of welding work is done after the circumferential welding of the equipment and the welding of the cylinder and the tube sheet are completed. It seems that the risk of excessive misalignment of the circumferential seam caused by welding deformation is avoided, but the elimination of the welding stress of the connecting pipe can only be carried out by local heat treatment. However, since the unmanned holes in the shell are all heat exchange tubes, the inside cannot be insulated, and the connecting pipe and the inner part of the cylinder cannot reach the heat treatment temperature, so the welding residual stress of the connecting pipe cannot be completely eliminated, which brings great safety hazards to the safe operation of the equipment. Summary of the invention

[0006] The utility model proposes a hydrogenation reactor which adopts inner groove welding (welding is performed inside the cylinder section) to solve the deformation caused by welding stress with the shortest process flow without increasing the manufacturing cost, and to eliminate the safety hazard of residual stress in the equipment.

[0007] The technical solution of this utility model:

[0008] A hydrogenation reactor, the hydrogenation reactor is a large-scale tubular reactor; the distance between the center of the cooling water inlet and outlet interface of the hydrogenation reactor and the center of the butt annular seam between its cylinder and tube sheet is ≤300mm;

[0009] The interface pipe constituting the cooling water inlet and outlet interface of the hydrogenation reactor is welded to the cylinder of the hydrogenation reactor.

[0010] The welding groove at the welding point between the interface pipe and the barrel of the hydrogenation reactor is an inner groove; preferably, a narrow gap single U-shaped inner groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the partial structure of the hydrogenation reactor (before the interface pipe and the cylinder are welded).

[0012] Figure 2 This is a schematic diagram of the partial structure of the hydrogenation reactor (after the interface pipe and the cylinder are welded).

[0013] In the figure, there are tube sheet 1, heat exchange tube 2, interface tube 3, cylinder 4, and inner groove 5. DETAILED DESCRIPTION

[0014] like Figure 1-2 As shown, a hydrogenation reactor comprises a tube sheet 1, a plurality of heat exchange tubes 2, a plurality of interface tubes 3, and a barrel 4. The tube sheet 1, each heat exchange tube 2, and barrel segment 4 are combined and connected together (the tube sheet 1 is welded to each heat exchange tube 2, and the tube sheet 1 is welded to the barrel 4). Each interface tube 3 is arranged on the barrel 4, and the center thereof is 300 mm away from the butt annular seam between the tube sheet 1 and the barrel 4. The interface tube 3 is welded to the barrel 4, and the welding groove at the welding place between the two is an inner groove 5.

[0015] The above embodiments are only for illustrating the technical concept and features of the invention, and their purpose is to enable people familiar with the technology to understand the content of the invention and implement it accordingly, and they cannot be used to limit the protection scope of the invention. Any equivalent changes or modifications made according to the spirit of the invention should be included in the protection scope of the invention.

Claims

1. A hydrogenation reactor, which is a large-scale shell-and-tube reactor; characterized in that: The distance between the center of the cooling water inlet and outlet interface of the hydrogenation reactor and the center of the butt joint annular seam between the cylinder and the tube sheet is ≤300mm; The interface pipe constituting the cooling water inlet and outlet interface of the hydrogenation reactor is welded to the cylinder of the hydrogenation reactor.

2. A hydrogenation reactor according to claim 1, characterized in that: The welding groove at the welding point between the interface pipe and the barrel of the hydrogenation reactor is an inner groove.

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