Tube sheet weld structure and reaction effluent cooler
By employing a novel tube sheet structure in the reaction effluent cooler, which uses Y-shaped rigid forgings welded to the shell and box, the problems of plastic deformation and weld quality of flexible tube sheets are solved, achieving equipment stability and efficient heat exchange, and improving the quality of olefin products and production safety.
Patent Information
- Application Number
- CN202423268519.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing reaction effluent coolers, the lap welding of flexible tube sheets leads to plastic deformation, uneven strain, and decreased mechanical properties of the material. Furthermore, the quality of the weld is difficult to assess, posing safety hazards. At the same time, the heat exchange efficiency needs to be improved.
A novel tube sheet structure is adopted, which is welded to the cylinder shell and box body by Y-shaped rigid forgings. Combined with the design of multiple nozzles evenly distributed, annular manifold, baffle and internal guide tube, the flexible tube sheet structure is stable and the stress is uniform, and 100% RT test is achieved.
It improves the tensile strength and equipment stability of flexible tube sheets, ensures the reliability of 100% RT testing, and significantly improves heat exchange efficiency, enhances the purity and quality of olefin products, and reduces energy consumption and costs.
Smart Images
Figure CN223610675U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of chemical equipment especially relates to a tube sheet welding structure and reaction effluent cooler. BACKGROUND
[0002] Low carbon olefins such as ethylene, propylene and the like are important basic chemical raw materials, with the development of China's national economy, especially the development of modern chemical industry, the demand for low carbon olefins is rising, and the contradiction between supply and demand will become increasingly prominent. MTO process and MTP process for preparing propylene from methanol are important chemical technologies at present.
[0003] The tube sheet welding structure and reaction effluent cooler are important equipment in the methanol-to-olefins device, especially the key equipment of the MTO reaction regeneration unit. In the process of methanol-to-olefins, the reaction effluent usually contains high-temperature and high-pressure olefin product gas, which needs to be cooled before subsequent processing. The tube sheet welding structure and reaction effluent cooler are used to realize this cooling process, which ensures the smooth progress of the subsequent process and helps to ensure the quality of the olefin product.
[0004] In the existing reaction effluent cooler, the welding method of the flexible tube sheet is in the form of lap welding with the cylinder, which has the following effects on the flexible tube sheet:
[0005] 1. Lap welding will cause plastic deformation on both sides of the material, resulting in uneven strain and deformation, which will further reduce the tensile properties of the material;
[0006] 2. The joint part of lap welding often becomes a weak link in the structure, resulting in a decrease in mechanical properties, which will affect the stability and safety of the entire structure;
[0007] 3. The lap joint cannot use a reasonable detection method, which will affect the judgment of the quality of the weld, and there is a safety hazard.
[0008] In addition, the heat exchange efficiency of the existing reaction effluent cooler needs to be further improved. UTILITY MODEL CONTENTS
[0009] The utility model aims at providing a tube sheet welding structure, which adopts a new welding structure to solve the adverse effects of the original lap welding, so that the flexible tube sheet structure is stable and the stress is uniform, the tensile properties are enhanced, and 100% RT detection can also be ensured.
[0010] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:
[0011] A tube sheet welding structure comprises:
[0012] A cylinder shell body,
[0013] a box body arranged above or below the shell body;
[0014] a flexible tube sheet arranged between the shell body and the box body, and having a curled edge extending towards the box body;
[0015] a rigid forge piece configured as a Y-shaped structure, and having three ends respectively welded to the shell body, the box body and the curled edge of the flexible tube sheet.
[0016] In some embodiments, the rigid forge piece comprises an inner ring portion and an outer ring portion connected as a whole.
[0017] In some embodiments, the two ends of the inner ring portion are welded to the box body and the curled edge of the flexible tube sheet, and the outer end of the outer ring portion is welded to the shell body.
[0018] In some embodiments, the flexible tube sheet is provided with a heat insulation lining on the side facing the box body.
[0019] In some embodiments, the rigid forge piece is provided with a vent pipe communicating with the atmosphere.
[0020] The utility model also provides a reaction effluent cooler comprising the tube sheet welding structure.
[0021] In some embodiments, the bottom of the shell body is axially provided with a plurality of lower nozzles, each of the lower nozzles is collected on a lower annular collecting pipe, and the lower annular collecting pipe is provided with a shell inlet.
[0022] In some embodiments, the bottom of the shell body is axially provided with a plurality of upper nozzles, each of the upper nozzles is collected on an upper annular collecting pipe, and the upper annular collecting pipe is provided with a shell outlet.
[0023] In some embodiments, the shell body is provided with a first baffle plate and a second baffle plate arranged alternately in up and down directions.
[0024] In some embodiments, the shell body is provided with an inner flow guide cylinder near the flexible tube sheet.
[0025] In some embodiments, the gap between the inner flow guide cylinder and the flexible tube sheet is not less than 100 mm.
[0026] Compared with the prior art, the utility model has at least the following beneficial effects:
[0027] 1. The flexible tube sheet is welded to the shell body and the box body by means of the Y-shaped rigid forge piece, the butt joint design makes the flexible tube sheet structure stable and the stress uniform, and the tensile strength of the flexible tube sheet is enhanced.
[0028] 2, butt welding can ensure 100% RT detection, thereby reducing the risk of defects in butt welds.
[0029] 3, the design of the multiple nozzle uniform distribution combined with the annular manifold, baffle plate design, inner flow body design, so that the equipment in the heat exchange efficiency greatly improved, not only improve the purity and quality of the olefin product, but also reduce the energy consumption and cost in the production process. BRIEF DESCRIPTION OF DRAWINGS
[0030] Figure 1 is the schematic diagram of the tube sheet welding structure of the utility model.
[0031] Figure 2 is the structural schematic diagram of the reaction effluent cooler of the utility model.
[0032] Figure 3 is Figure 2 the enlarged view of the part.
[0033] In the figure: 1, the cylinder shell; 2, the box; 3, flexible tube sheet; 31, warping part; 4, rigid forging; 41, inner ring part; 42, outer ring part; 5, heat insulation lining; 6, emptying pipe; 7, lower nozzle; 8, lower annular manifold; 9, shell side inlet; 10, upper nozzle; 11, annular manifold; 12, shell side outlet; 13, first baffle; 14, second baffle; 15, inner flow cylinder; 16, support ring; 17, tube side inlet; 18, tube side outlet; 19, heat exchange tube bundle. DETAILED DESCRIPTION
[0034] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and fully convey the inventive aspects of example implementations to those skilled in the art. Identical reference numerals refer to the same or similar elements throughout the several views of the drawings, and so description of the same will be simplified or omitted in some instances.
[0035] The words expressing position and direction described in the utility model are all explained by taking the drawings as examples, but changes can also be made according to needs, and the changes made are all included in the protection scope of the utility model.
[0036] Referring to Figure 1 As shown in the figure, the utility model discloses a tube sheet welding structure, including cylinder shell 1, box 2, flexible tube sheet 3 and rigid forging 4.
[0037] The shell body 1 is vertically arranged, the box body 2 is arranged above or below the shell body 1, the flexible tube plate 3 is arranged between the shell body 1 and the box body 2, and the edge of the flexible tube plate 3 has a bending part 31 extending towards the box body 2. The rigid forge piece 4 is configured as a Y-shaped structure, and the three ends of the rigid forge piece 4 are respectively welded after being butt-jointed with the shell body 1, the box body 2 and the bending part 31 of the flexible tube plate 3.
[0038] Specifically, as shown in the drawings, Figure 1 The rigid forge piece 4 includes an inner ring part 41 and an outer ring part 42 which are integrated. The upper end of the inner ring part 41 is butt-jointed and welded with the box body 2, and the lower end is butt-jointed and welded with the bending part 31 of the flexible tube plate 3. The outer extending end of the outer ring part 42 is butt-jointed and welded with the shell body 1, and thus the welding installation of the flexible tube plate 3 is completed.
[0039] Compared with the existing lap welding structure, the flexible tube plate 3 of the present application is welded with the shell body 1 and the box body 2 by means of the Y-shaped rigid forge piece 4. The butt-joint design makes the structure of the flexible tube plate 3 stable and the stress uniform, which not only enhances the tensile property of the flexible tube plate 3, but also reduces the fatigue strength of the butt-joint weld, and can ensure 100% RT detection, thereby reducing the risk of defects in the butt-joint weld.
[0040] Further, the side of the flexible tube plate 3 towards the box body 2 is provided with a heat insulation lining 5, so as to reduce or isolate the damage of the high-temperature medium (such as high-temperature and high-pressure olefin product gas input from the boiler) to the flexible tube plate 3, and extend the service life of the equipment. On the other hand, the heat insulation lining 5 can also reduce or isolate the heat exchange of the low-temperature medium (such as water or low-pressure steam) in the shell side to the high-temperature medium of the box body 2, so as to reduce the energy consumption and cost.
[0041] Further, the rigid forge piece 4 is provided with a vent pipe 6 communicating with the atmosphere, for discharging the gas generated in the heat exchange process, reducing the accumulation of gas in the shell side, and ensuring the smooth heat exchange. In addition, the vent pipe 6 can adjust the pressure in the shell body 1, preventing the safety hazard caused by overpressure.
[0042] As shown in the drawings, Figures 2 to 3 The utility model discloses still a kind of reaction effluent coolers (vertical), including the tube plate welding structure of above.
[0043] Specifically, the reaction effluent cooler includes shell body 1, two box bodies 2, two flexible tube plates 3 and heat exchange tube bundle 19. The shell body 1 is vertically arranged, and the two box bodies 2 and the two flexible tube plates 3 are arranged at the upper and lower ends of the shell body 1 respectively, for easy distinction, called upper box body, upper flexible tube plate and upper box body, upper flexible tube plate below. The upper and lower box bodies are respectively provided with tube side inlet 17 and tube side outlet 18, and the heat exchange tube bundle 19 is arranged between the upper and upper flexible tube plates, and the bottom and top of the shell body 1 are respectively provided with shell side inlet 9 and shell side outlet 12.
[0044] When the reaction effluent cooler is in operation, the high-temperature medium (olefin product gas) flows out of the boiler, enters the upper box through the tube inlet 17, and then enters the heat exchange tube bundle 19. During this process, the low-temperature medium (low-pressure steam) enters the shell inlet 9 to flush the heat exchange tube bundle 19, and then flows out of the shell outlet 12 after heat exchange with the high-temperature medium. The high-temperature medium in the heat exchange tube bundle 19 flows to the upper box after effective cooling, and then enters the next process through the tube outlet 18.
[0045] In this process, the new welding structure effectively improves the structural stability and stress uniformity of the flexible tube plate 3 welding position, significantly improves the mechanical properties and service life of the flexible tube plate 3, and ensures the stable operation of the equipment and the safety of production.
[0046] See Figure 2 Right half, the bottom of the cylinder shell 1 is axially uniformly distributed with a plurality of lower nozzles 7, for example, 4-6, each lower nozzle 7 converges on the lower annular collector 8, and the shell inlet 9 is connected to the lower annular collector 8.
[0047] This design enables the low-temperature medium flowing in from the shell inlet 9 to be evenly distributed to the upper flexible tube plate, and also prevents it from gathering at a certain position of the flexible tube plate 3, thereby improving the gas inlet effect.
[0048] See Figure 2 Left half, the bottom of the cylinder shell 1 is axially uniformly distributed with a plurality of upper nozzles 10, for example, 6-8, each upper nozzle 10 converges on the upper annular collector 11, and the upper annular collector 11 is provided with a shell outlet 12.
[0049] This design enables the low-temperature medium after heat exchange to be evenly distributed to the upper flexible tube plate, and also prevents it from gathering at a certain position of the flexible tube plate 3, thereby improving the gas outlet effect. As a preferred embodiment, the upper nozzles 10 are arranged as close to the upper flexible tube plate as possible to further reduce the gathering of gas-liquid mixture.
[0050] Also as Figure 2 shown, in some embodiments, the cylinder shell 1 is provided with a first baffle 13 and a second baffle 14 arranged alternately. The first baffle 13 is an arch-shaped plate with a middle gap and symmetrical on both sides, and the second baffle 14 is a strip-shaped plate with gaps on both sides. The two baffles cooperate to form a double-arch baffle, which maximally reduces the dead zone of the low-temperature medium flowing upward and relieves the flow rate. The purpose is to enable the low-temperature medium to fully contact the outer surface of the heat exchange tube bundle 19 during upward flow, thereby improving the heat exchange efficiency.
[0051] In combination Figure 3As shown, in some embodiments, an inner guide cylinder 15 is arranged in the cylinder shell 1 close to the flexible tube plate 3. Specifically, the inner guide cylinder 15 is provided with a support ring 16 away from one side of the flexible tube plate 3, and can be fixed in the cylinder shell 1 by means of the support ring 16.
[0052] In the present application, the number of inner guide cylinders 15 is two, which are arranged below the upper flexible tube plate and above the upper flexible tube plate, hereinafter referred to as upper inner guide cylinder and lower inner guide cylinder. Among them, the lower inner guide cylinder can reduce the impact of high flow rate low temperature medium at the shell side inlet 9 on the heat exchange tube bundle 19 and the upper flexible tube plate, and the upper inner guide cylinder can force the heat exchanged low temperature medium to uniformly flush the upper flexible tube plate at a specific flow rate, avoid local overheating, and ensure the safe and reliable operation of the equipment.
[0053] Among them, the gap between the inner guide cylinder 15 and the flexible tube plate 3 is not less than 100mm, for example, it can be 110mm, 125mm, 140mm, etc., to ensure that the flow rate of the low temperature medium is not less than 3m / s.
[0054] In summary, the reaction effluent cooler is designed by combining the multi-nozzle uniform distribution with the annular manifold, the baffle plate design, and the inner guide body design, so that the heat exchange efficiency of the equipment is greatly improved, not only the purity and quality of the olefin product are improved, but also the energy consumption and cost in the production process are reduced; at the same time, the continuity and safety of the entire production line are also ensured.
[0055] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and modify the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model, all these changes should belong to the protection scope of the utility model claim.
Claims
1. A tube sheet welded structure, characterized by, The utility model relates to a tube plate welding structure of a heat exchanger, comprising: a cylinder shell (1), a box body (2) arranged above or below the cylinder shell (1); a flexible tube plate (3) arranged between the cylinder shell (1) and the box body (2) and having a curved portion (31) extending towards the box body (2) at an edge thereof; a rigid forge piece (4) configured as a Y-shaped structure, three ends of the rigid forge piece (4) being respectively welded to the cylinder shell (1), the box body (2) and the curved portion (31) of the flexible tube plate (3) one by one.
2. The tube sheet weld structure of claim 1, wherein The rigid forge piece (4) comprises an inner ring portion (41) and an outer ring portion (42) connected as a whole. The two ends of the inner ring portion (41) are welded to the box body (2) and the curved portion (31) of the flexible tube plate (3) respectively, and the outer end of the outer ring portion (42) is welded to the cylinder shell (1).
3. The tube sheet weld structure of claim 1, wherein The side of the flexible tube plate (3) facing the box body (2) is provided with a heat insulation lining (5).
4. The tube sheet weld structure of claim 1, wherein An exhaust pipe (6) communicating with the atmosphere is arranged on the rigid forge piece (4).
5. A reactor effluent cooler characterized by, The utility model relates to a tube plate welding structure of a heat exchanger.
6. The reaction effluent cooler of claim 5, wherein, The bottom of the cylinder shell (1) is axially uniformly provided with a plurality of lower tube nozzles (7), each of the lower tube nozzles (7) converging on a lower annular collecting pipe (8), and the lower annular collecting pipe (8) is provided with a shell inlet (9).
7. The reaction effluent cooler of claim 5, wherein, The bottom of the cylinder shell (1) is axially uniformly provided with a plurality of upper tube nozzles (10), each of the upper tube nozzles (10) converging on an upper annular collecting pipe (11), and the upper annular collecting pipe (11) is provided with a shell outlet (12).
8. The reaction effluent cooler of claim 5, wherein, The cylinder shell (1) is provided with a first baffle (13) and a second baffle (14) arranged alternately in an up-down direction.
9. The reaction effluent cooler of claim 5, wherein, The cylinder shell (1) is provided with an inner flow guide cylinder (15) close to the flexible tube plate (3).
10. The reaction effluent cooler of claim 9, wherein, The gap between the inner flow guide cylinder (15) and the flexible tube plate (3) is not less than 100 mm.