A u-bundle protection structure for a sulfuric acid steam generator
Patent Information
- Application Number
- CN202522510049.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-26
AI Technical Summary
[0005]本实用新型的目的在于提供一种硫酸蒸汽发生器的U形管束保护结构，主要解决了U型管进口端面受硫酸携带的陶瓷碎片冲击，损伤U型管表面钝化膜，造成U型管和焊缝腐蚀严重的问题
[0014]本实用新型的有益效果：该一种硫酸蒸汽发生器的U形管束保护结构，通过设置的防护机构，使得套管能够对U型管的进口端和焊接部起到防护作用，避免瓷片冲击划伤U型管的进口端和焊接部，进而提高管束的使用寿命，同时，通过设置的四个角钢和四个摩擦板，便于对管束在安装维护时，起支撑导向作用，且使得管束的上下位置保持对称，从而能够转动管束对管束的上下位置进行调换，使得U型管的两端口均保持均匀的冲刷作用，延长管束使用寿命，另外，通过设置的过滤机构，能够对进入到U型管内的硫酸起过滤作用，阻挡硫酸携带的瓷片进入到U型管内，从而进一步提高管束的使用寿命和换热效果。
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Figure CN224904907U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sulfuric acid vapor generator technology, specifically to a U-shaped tube bundle protection structure for a sulfuric acid vapor generator. Background Technology
[0002] In the series of sulfuric acid production processes, a considerable amount of heat is generated. One of the core pieces of equipment in the low-temperature waste heat recovery system of the dry absorption section is the sulfuric acid steam generator. The sulfuric acid steam generator uses the heat from the high-temperature sulfuric acid from the high-temperature absorption tower of the upstream equipment to make the high-temperature sulfuric acid flow in the tube bundle inside the shell, while water flows in the shell side outside the tube bundle. Through heat exchange with the tube wall, the water is vaporized to generate steam.
[0003] U-tube bundles are heat exchange components composed of multiple U-shaped metal tubes. They are the core components of U-tube heat exchangers. U-tube bundles are usually made of stainless steel and passivated on the surface by chemical methods to form a dense oxide film, which enhances corrosion resistance. At the same time, multiple U-tubes are usually fixed to the tube sheet flange by welding to achieve sealing and fixed support.
[0004] Considering that when the existing U-tube bundles are in use, the high-temperature sulfuric acid from the high-temperature absorption tower carries small fragments of ceramic packing into the sulfuric acid vapor generator. After the high-speed flowing ceramic fragments impact the inlet end face of the tube bundle, the impact point is easily damaged. As the usage time of the U-tube increases, once the surface passivation film of the stainless steel is damaged, the corrosion rate will increase, resulting in severe corrosion of the weld or U-tube, causing penetration and leading to sulfuric acid leakage, thus reducing the service life of the U-tube bundle. Utility Model Content
[0005] The purpose of this utility model is to provide a U-shaped tube bundle protection structure for a sulfuric acid vapor generator, which mainly solves the problem that the inlet end face of the U-shaped tube is damaged by the impact of ceramic fragments carried by sulfuric acid, resulting in severe corrosion of the U-shaped tube and weld.
[0006] To achieve this objective, the present invention adopts the following technical solution: This utility model provides a U-shaped tube bundle protection structure for a sulfuric acid vapor generator, including a tube sheet flange, a tube sheet, multiple U-shaped tubes, a protective mechanism, and a filtering mechanism. The tube sheet is fixedly installed to the tube sheet flange by threaded rods, and the tube sheet passes through multiple U-shaped tubes. The multiple U-shaped tubes are fixedly installed to the tube sheet flange by multiple welded parts, and the ends of the U-shaped tubes extend out of the end face of the tube sheet flange. The protective mechanism is used to protect the U-shaped tubes, and the filtering mechanism is used to filter the sulfuric acid entering the U-shaped tubes. The protective mechanism includes multiple sleeves, which are inserted into multiple U-shaped tubes. Multiple annular grooves are formed on the tube sheet flange, and the sleeves are inserted into these grooves. By inserting the sleeves into the U-shaped tubes and annular grooves, the ends and welded parts of the U-shaped tubes are protected, preventing ceramic fragments from impacting and scratching them.
[0007] Furthermore, two adjacent sleeves are connected by T-slots and T-plugs, with the T-slots and T-plugs fixedly installed on both sides of the sleeves respectively.
[0008] Furthermore, the protective mechanism also includes an elastic gasket, which is fixedly installed inside the annular groove, and the outer wall of the sleeve is tapered at the end near the tube sheet flange.
[0009] Furthermore, the protective mechanism also includes snap-fit fasteners, which are rotatably mounted on the tube sheet flange via fixing blocks. Sleeves adjacent to the snap-fit fasteners are snapped into place by compression blocks. Through the snap-fit action between the fasteners and compression blocks, the sleeves adjacent to the snap-fit fasteners are secured. Simultaneously, multiple adjacent sleeves are connected sequentially via T-slot blocks and T-insert blocks, achieving a secure hold and preventing sleeves from detaching.
[0010] Furthermore, the protective mechanism also includes four angle steels and four friction plates. The four angle steels are all fixedly installed on the tube sheet and distributed along the circumference of the tube sheet, and the four friction plates are fixedly installed on the four angle steels respectively.
[0011] Furthermore, the filtration mechanism includes a filter sleeve and a fixing frame. The fixing frame is fixedly installed on the sleeve, and the filter sleeve is hinged to the sleeve, with the filter sleeve inserted into the fixing frame. The filter sleeve filters the sulfuric acid entering the U-tube, thus preventing the ceramic plates from entering the U-tube along with the sulfuric acid, which could damage the inner wall of the U-tube or affect the heat exchange effect.
[0012] Furthermore, the filtration mechanism also includes a cylindrical block with a circular hole on the fixed frame. The cylindrical block is slidably installed on the filter sleeve and is engaged with the circular hole by a spring.
[0013] Furthermore, the inner side of the filter sleeve is frustum-shaped.
[0014] The beneficial effects of this utility model are as follows: This U-shaped tube bundle protection structure for a sulfuric acid vapor generator, through the set protective mechanism, enables the sleeve to protect the inlet end and weld of the U-shaped tube, preventing ceramic pieces from impacting and scratching the inlet end and weld of the U-shaped tube, thereby improving the service life of the tube bundle. At the same time, the four angle steels and four friction plates set up facilitate the support and guidance of the tube bundle during installation and maintenance, and keep the upper and lower positions of the tube bundle symmetrical, so that the upper and lower positions of the tube bundle can be rotated to change the upper and lower positions, so that both ends of the U-shaped tube maintain a uniform scouring effect, extending the service life of the tube bundle. In addition, the set filtration mechanism can filter the sulfuric acid entering into the U-shaped tube, preventing the ceramic pieces carried by the sulfuric acid from entering the U-shaped tube, thereby further improving the service life of the tube bundle and the heat exchange effect. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments of this utility model will be briefly introduced below.
[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the main structure of the tube sheet flange of this utility model; Figure 3 This is a cross-sectional view of the tube sheet flange and U-tube of this utility model; Figure 4 This is a schematic diagram of the main structure of the protective mechanism of this utility model; Figure 5 This is a schematic cross-sectional view of the sleeve structure of this utility model; Figure 6 This is a schematic diagram of the disassembled structure of the elastic gasket and tube sheet flange of this utility model. Figure 7 This is a schematic diagram of the main structure of the sleeve adjacent to the snap fastener of this utility model; Figure 8 This is a schematic diagram of the main structure of the sleeve adjacent to the snap fastener of this utility model; Figure 9 This is a schematic cross-sectional view of the angle steel structure of this utility model; Figure 10 This is a cross-sectional view of the filter sleeve of this utility model.
[0017] In the diagram: 1. Tube sheet flange; 2. Tube sheet; 3. U-tube; 4. Threaded rod; 5. Protective mechanism; 51. Sleeve; 52. T-slot block; 53. T-slot insert; 54. Annular groove; 55. Elastic gasket; 56. Snap-fit buckle; 57. Fixing block; 58. Extrusion block; 59. Angle steel; 510. Friction plate; 6. Filtering mechanism; 61. Filter sleeve; 62. Spring; 63. Cylindrical block; 64. Fixing frame; 65. Round hole; 7. Welded part. Detailed Implementation
[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0019] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0020] Reference Figures 1 to 3 The diagram illustrates a U-shaped tube bundle protection structure for a sulfuric acid vapor generator, comprising a tube sheet flange 1, a tube sheet 2, multiple U-shaped tubes 3, a protective mechanism 5, and a filtering mechanism 6. The tube sheet 2 is fixedly installed to the tube sheet flange 1 via threaded rods 4, and the tube sheet 2 passes through multiple U-shaped tubes 3. The tube sheet 2 is provided with multiple tubes to support and fix the multiple U-shaped tubes 3. The multiple U-shaped tubes 3 are fixedly installed to the tube sheet flange 1 via multiple welded parts 7, and the ends of the U-shaped tubes 3 extend out of the end face of the tube sheet flange 1. By extending the U-shaped tubes 3 outward from the end face of the tube sheet flange 1, the U-shaped tubes 3 are impacted by ceramic plates before the welded parts 7, while also protecting the welded parts 7. The protective mechanism 5 is used to protect the U-shaped tubes 3, thereby preventing the end face of the U-shaped tubes 3 and the welded parts 7 from being impacted by ceramic plates. The filtering mechanism 6 is used to filter the sulfuric acid entering the U-shaped tubes 3, preventing ceramic plates from entering the U-shaped tubes 3 with the sulfuric acid, thus affecting the heat exchange effect of the U-shaped tubes 3 and reducing damage to the inner wall of the U-shaped tubes 3.
[0021] Reference Figures 4 to 6 Specifically, the protective mechanism 5 includes multiple sleeves 51, which are inserted into multiple U-shaped tubes 3. By inserting the sleeves 51 into the end face of the U-shaped tubes 3, the ceramic pieces are prevented from directly impacting the end face of the U-shaped tubes 3, thus protecting the end face of the U-shaped tubes 3. Multiple annular grooves 54 are provided on the tube sheet flange 1, and the multiple sleeves 51 are inserted into the multiple annular grooves 54. By inserting the sleeves 51 into the annular grooves 54, the welded part 7 is located in a closed space, preventing the welded part 7 from being impacted by the ceramic pieces and corroded by sulfuric acid.
[0022] Reference Figures 4 to 6More specifically, adjacent sleeves 51 are connected by T-shaped grooves 52 and T-shaped inserts 53, which are fixedly installed on both sides of the sleeve 51. The sizes of the T-shaped grooves 52 and T-shaped inserts 53 correspond. By sequentially inserting the T-shaped grooves 52 and T-shaped inserts 53 on adjacent sleeves 51, the adjacent sleeves 51 are kept connected together, improving stability. The protective mechanism 5 also includes an elastic gasket 55, which is fixedly installed on the inner side of the annular groove 54. The elastic gasket 55 further improves the sealing between the annular groove 54 and the sleeve 51, and facilitates the snap-fit buckle 56 and the compression block 58 to snap together. The outer wall of the sleeve 51 near the tube sheet flange 1 is tapered, which serves to guide the flow and prevent sulfuric acid from flowing to the welded part 7.
[0023] Reference Figures 6 to 9 More specifically, the protective mechanism 5 also includes a snap fastener 56, which is rotatably mounted on the tube sheet flange 1 via a fixing block 57. The snap fastener 56 clamps and presses against the pressing block 58, keeping the sleeve 51 adjacent to the snap fastener 56 in a fixed state. The sleeve 51 adjacent to the snap fastener 56 is clamped to the snap fastener 56 via the pressing block 58. When the sleeve 51 adjacent to the snap fastener 56 is fixed, another sleeve 51 adjacent to it can be connected and fixed to it via a T-slot block 52 and a T-insert block 53. The protective mechanism 5 also includes four angle steels 59 and four friction plates 510. The four angle steels 59 are all fixedly installed on the tube sheet 2 and distributed around the circumference of the tube sheet 2. The four circumferentially distributed angle steels 59 can support and guide the tube bundle, while keeping the upper and lower positions of the tube bundle symmetrical. This makes it easy to rotate the tube bundle to change its upper and lower positions during maintenance, so that the two ends of the U-shaped tube 3 are evenly scourted as the inlet ends. The four friction plates 510 are fixedly installed on the four angle steels 59 respectively, and the friction plates 510 provide wear-resistant protection for the angle steels 59.
[0024] Reference Figure 8 and Figure 10In addition, the filter mechanism 6 includes a filter sleeve 61 and a fixing frame 64. The fixing frame 64 is fixedly installed on the sleeve 51 and serves to limit the position of the filter sleeve 61. The filter sleeve 61 is hinged to the sleeve 51 and is inserted into the fixing frame 64. Through the filter sleeve 61, sulfuric acid entering the sleeve 51 can be filtered to remove broken porcelain pieces. The hinged connection between the filter sleeve 61 and the sleeve 51 facilitates the opening and closing of the filter sleeve 61, thereby enabling cleaning and maintenance of the filter sleeve 61 and the sleeve 51. The filter mechanism 6 also includes a cylindrical block 63. A circular hole 65 is provided on the fixing frame 64, the size of which corresponds to the size of the cylindrical block 63. The cylindrical block 63 is slidably mounted on the filter sleeve 61, and is driven by a spring 62 to engage with the circular hole 65. The spring force of the spring 62 drives the cylindrical block 63 to engage with the circular hole 65, thereby limiting the position of the fixing frame 64 on the filter sleeve 61, thus keeping the filter sleeve 61 in a fixed and closed state. The inner side of the filter sleeve 61 is frustoconical, which serves as a flow guide, facilitating the entry of sulfuric acid into the interior of the filter sleeve 61 for filtration.
[0025] Reference Figures 1 to 10 The U-shaped tube bundle protection structure of this sulfuric acid vapor generator is installed by passing multiple U-shaped tubes 3 sequentially through the tube sheet 2 and the tube sheet flange 1, so that the two ends of the U-shaped tubes 3 extend out of the end face of the tube sheet flange 1. The installed U-shaped tubes 3 are then welded and fixed to the tube sheet flange 1 by manual welding.
[0026] Subsequently, by sequentially inserting multiple sleeves 51 into the port of the U-shaped tube 3 and connecting them to each other through the T-shaped groove block 52 and the T-shaped insertion block 53, and by the squeezing and snapping effect of the snap fastener 56 and the compression block 58, the sleeves 51 adjacent to the snap fastener 56 are fixed, thereby keeping multiple sleeves 51 in a fixed inserted state and providing protection for the port of the U-shaped tube 3 and the welded part 7.
[0027] In addition, by inserting the filter sleeve 61 into the fixed frame 64, the cylindrical block 63 is driven by the elastic force of the spring 62 to engage with the round hole 65, thereby limiting the cylindrical block 63 and keeping the filter sleeve 61 in a fixed and closed state, which facilitates the filtration of sulfuric acid entering the sleeve 51.
[0028] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.
Claims
1. A U-shaped tube bundle protection structure for a sulfuric acid vapor generator, characterized in that, The system includes a tube sheet flange (1), a tube sheet (2), multiple U-tubes (3), a protective mechanism (5), and a filtering mechanism (6). The tube sheet (2) is fixedly installed on the tube sheet flange (1) by a threaded rod (4), and the tube sheet (2) passes through multiple U-tubes (3). The multiple U-tubes (3) are fixedly installed on the tube sheet flange (1) by multiple welded parts (7), and the ends of the U-tubes (3) extend out of the end face of the tube sheet flange (1). The protective mechanism (5) is used to protect the U-tubes (3), and the filtering mechanism (6) is used to filter the sulfuric acid entering the U-tubes (3). The protective mechanism (5) includes multiple sleeves (51), which are inserted into multiple U-shaped tubes (3). Multiple annular grooves (54) are provided on the tube sheet flange (1), and the multiple sleeves (51) are inserted into the multiple annular grooves (54).
2. The U-shaped tube bundle protection structure for a sulfuric acid vapor generator according to claim 1, characterized in that, The two adjacent sleeves (51) are connected by T-shaped slots (52) and T-shaped inserts (53), and the T-shaped slots (52) and T-shaped inserts (53) are respectively fixedly installed on both sides of the sleeves (51).
3. The U-shaped tube bundle protection structure for a sulfuric acid vapor generator according to claim 1, characterized in that, The protective mechanism (5) also includes an elastic gasket (55), which is fixedly installed on the inner side of the annular groove (54), and the outer wall of the sleeve (51) is tapered at the end near the tube sheet flange (1).
4. The U-shaped tube bundle protection structure for a sulfuric acid vapor generator according to claim 3, characterized in that, The protective mechanism (5) also includes a snap fastener (56), which is rotatably installed on the tube sheet flange (1) by a fixing block (57), and the sleeve (51) adjacent to the snap fastener (56) is snapped with the snap fastener (56) by a pressing block (58).
5. The U-shaped tube bundle protection structure for a sulfuric acid vapor generator according to claim 4, characterized in that, The protective mechanism (5) also includes four angle steels (59) and four friction plates (510). The four angle steels (59) are all fixedly installed on the tube plate (2) and distributed along the circumference of the tube plate (2). The four friction plates (510) are respectively fixedly installed on the four angle steels (59).
6. The U-shaped tube bundle protection structure for a sulfuric acid vapor generator according to claim 1, characterized in that, The filtration mechanism (6) includes a filter sleeve (61) and a fixing frame (64). The fixing frame (64) is fixedly installed on the sleeve (51). The filter sleeve (61) is hinged to the sleeve (51), and the filter sleeve (61) is inserted into the fixing frame (64).
7. The U-shaped tube bundle protection structure for a sulfuric acid vapor generator according to claim 6, characterized in that, The filter mechanism (6) also includes a cylindrical block (63), and a circular hole (65) is provided on the fixed frame (64). The cylindrical block (63) is slidably installed on the filter sleeve (61), and the cylindrical block (63) is driven to engage with the circular hole (65) by a spring (62).
8. The U-shaped tube bundle protection structure for a sulfuric acid vapor generator according to claim 7, characterized in that, The inner side of the filter sleeve (61) is frustum-shaped.