A range divider structure

Abstract

The utility model discloses a kind of sub-ranges partition plate structures, applied to the cylinder inside of multi-tube pass heat exchanger, including first sub-block, intermediate block and second sub-block, the first sub-block and second sub-block are respectively welded with the inside of cylinder, the gap is reserved between the both ends of the intermediate block and first sub-block and second sub-block respectively, the gap is filled with sealant, the intermediate block is detachable. The junction of the first sub-block and the intermediate block is clamped and fixed from upper and lower two sides using first group of connecting plates, copper gasket is provided between the connecting plate and the first sub-block, intermediate block, and is connected and fixed using bolt and nut;The junction of the second sub-block and the intermediate block is fixed using the same way as above. The utility model passes through optimization structure design, the intermediate block of sub-ranges partition plate structure is detachable, intermediate gap has buffer, can substantially reduce the risk that partition plate and tube box weld are pulled apart due to thermal stress and fatigue stress, reduce adverse effect.

Description

Technical Field

[0001] This utility model relates to the technical field of baffle equipment applied to the inlet and outlet of multi-pass heat exchangers, specifically a detachable partition structure. Background Technology

[0002] Partitioned baffle structures are generally used in heat exchangers with multiple tube passes and large inlet / outlet temperature differences, as well as cyclic loads. This temperature difference can be specified as 110°C. Previously, many projects required consideration of the impact of temperature differences on the equipment when the inlet / outlet temperature difference exceeded a certain value.

[0003] Partition plates are commonly used in multi-pass heat exchangers, mainly to separate different fluid channels, increase flow length, and improve heat transfer efficiency. The stress condition of the welded plates is crucial to the safety and performance of the vessel.

[0004] like Figure 1 The diagram shows a traditional partitioned baffle structure, in which the partitioned baffle 01 is directly welded to the cylinder 02 at both ends A and B. Since the partitioned baffle 01 is a single, integral structure, the disadvantages of this welded structure are:

[0005] (1) For equipment with cyclic loads, fatigue stress under cyclic loads is also a very important factor, especially when the equipment is frequently started and stopped or pressure fluctuates, fatigue cracks are likely to appear at the weld.

[0006] (2) Forces caused by structural constraints. After welding, constraint stress may occur at the connection between the partition and the shell or tube sheet due to differences in structural rigidity;

[0007] (3) For composite panel equipment, the base material and the partition plate material are usually different, which can cause material problems. For example, the difference in the thermal expansion coefficient of the materials may lead to additional stress.

[0008] (4) The weight of the partition itself and the impact or vibration load brought about by the flow of the medium may also affect the weld.

[0009] The partition structure is also affected by various stress changes, such as welding residual stress, including thermal stress and phase transformation stress. Thermal stress is caused by uneven temperature changes during welding, while phase transformation stress may occur when the material undergoes a phase transformation, such as the formation of martensite in some steels during rapid cooling, causing stress due to volume change. Generally, phase transformation stress is not considered; only welding thermal stress is taken into account. Thermal stress caused by temperature changes is very important, especially under high or low temperature operating conditions, where the restricted expansion or contraction of the material generates stress. If the temperature difference between the inlet and outlet of the tube is large, this thermal stress may become the most critical limiting factor. Utility Model Content

[0010] The purpose of this utility model is to provide a partition structure that overcomes the defects of the above-mentioned background technology. By optimizing the structural design and making it a detachable structure with a buffer in the middle gap, the risk of the weld between the partition and the pipe box being torn due to thermal stress and fatigue stress can be greatly reduced, and the adverse effects caused by structural stress problems can be reduced.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] A split-pass partition structure is applied to the shell of a multi-pass heat exchanger, comprising a first block, an intermediate block, and a second block. The first block and the second block are respectively welded to the interior of the shell. Gaps are maintained between the two ends of the intermediate block and the first block and the second block, respectively. The gaps are filled with sealant. The intermediate block is detachable.

[0013] The first segment and the middle block are connected by a first set of connecting plates clamping and fixing them from the top and bottom sides. Copper gaskets are provided between the connecting plates and the first segment and the middle block.

[0014] The second segment and the middle block are connected by a second set of connecting plates that clamp and fix them from the top and bottom sides. Copper gaskets are provided between the connecting plates and the second segment and the middle block.

[0015] Furthermore, the first segment, the intermediate block, and the first set of connecting plates are connected and fixed by bolts and nuts, and the nuts and bolts are spot welded together.

[0016] The second segment, the intermediate block, and the second set of connecting plates are connected and fixed by bolts and nuts, and the nuts and bolts are spot welded together.

[0017] Furthermore, the gap between the first segment and the middle block is 5mm, and the gap between the second segment and the middle block is also 5mm. Appropriate gaps can buffer the adverse effects of thermal stress and phase transformation stress on the structure.

[0018] Preferably, the intermediate block is located between the first and second blocks and is detachable, making it more convenient to use.

[0019] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model facilitates the welding of the partition structure and the tube box body, ensuring the welding quality.

[0020] (2) The present invention changes the partition plate into a detachable structure with a buffer in the middle gap, which can greatly reduce the cracking of the weld between the partition plate and the pipe box caused by thermal stress and fatigue stress.

[0021] (3) For multi-pass structures, the middle part of the partition plate can be removed. For tube box with flat cover structure, the welded joint between tube sheet and heat exchange tube is easy to inspect or repair without removing the tube box. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a traditional partition structure.

[0023] Figure 2 This is a schematic diagram of the structure of this utility model.

[0024] In the diagram: 01, partition plate; 02, cylinder; 1, first section; 2, second section; 3, intermediate block; 4, cylinder; 11, connecting plate; 12, connecting plate; 13, copper gasket; 14, copper gasket; 15, gap; 16, bolt and nut assembly; 21, connecting plate; 22, connecting plate; 23, copper gasket; 24, copper gasket; 25, gap; 26, bolt and nut assembly. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 2 This utility model provides a technical solution:

[0027] A partition structure is disclosed for use within the shell of a multi-pass heat exchanger. It includes a first partition 1, an intermediate block 3, and a second partition 2. The first partition 1 and the second partition 2 are welded to the interior of the shell 4. A gap 15 is maintained between one end of the intermediate block 3 and the first partition 1, and a gap 25 is maintained between the other end of the intermediate block 3 and the second partition 2. Both gaps 15 and 25 are filled with sealant. The intermediate block 3 is removable, which helps alleviate adverse problems caused by thermal stress and fatigue stress, and also facilitates the use and maintenance of the multi-pass heat exchanger.

[0028] Both gaps 15 and 25 are set to 5mm. Appropriate gaps can buffer the adverse effects of thermal stress and phase transformation stress on the structure.

[0029] The first segment 1 and the middle segment 3 are connected by connecting plates 11 and 12 from the top and bottom sides. Copper gaskets 13 are provided between the connecting plate 11 and the first segment 1 and the middle segment 3. Then, bolt and nut assembly 16 is used to connect and fix each part. The bolts and nuts are fixed by spot welding.

[0030] The second segment 2 and the middle segment 3 are connected by connecting plates 21 and 22, which clamp and fix them from the top and bottom sides. Copper gaskets 23 are provided between the connecting plate 21 and the second segment 21 and the middle segment 3. Then, bolt and nut assembly 26 is used to connect and fix each part. The bolts and nuts are fixed by spot welding.

[0031] This invention modifies the partition plate into a detachable structure with a buffer in the middle gap, which can greatly reduce the cracking of the weld between the partition plate and the pipe box caused by thermal stress and fatigue stress.

[0032] For multi-pass structures, the middle part of the partition plate can be removed. For tube box structures with flat covers, the welded joints between the tube sheet and the heat exchange tubes can be easily inspected or repaired without removing the tube box.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-pass baffle structure, applied inside the shell of a multi-pass heat exchanger, characterized in that, It includes a first section, an intermediate section, and a second section. The first section and the second section are welded to the inside of the cylinder, and gaps are maintained between the two ends of the intermediate section and the first section and the second section, respectively. The gaps are filled with sealant, and the intermediate section is detachable. The first segment and the middle block are connected by a first set of connecting plates clamping and fixing them from the top and bottom sides. Copper gaskets are provided between the connecting plates and the first segment and the middle block. The second segment and the middle block are connected by a second set of connecting plates that clamp and fix them from the top and bottom sides. Copper gaskets are provided between the connecting plates and the second segment and the middle block.

2. The partition structure according to claim 1, characterized in that: The first segment, the intermediate block, and the first set of connecting plates are connected and fixed by bolts and nuts, and the nuts and bolts are spot welded together.

3. The partition structure according to claim 1, characterized in that: The second segment, the intermediate block, and the second set of connecting plates are connected and fixed by bolts and nuts, and the nuts and bolts are spot welded together.

4. The partition structure according to claim 1, characterized in that, The gap between the first segment and the middle block is 5mm, and the gap between the second segment and the middle block is also 5mm.

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