Replaceable plate bundle unit all-welded plate gas-gas heat exchanger

Abstract

The utility model provides a replaceable plate bundle unit full welding plate type gas-gas heat exchanger, a plurality of single plate bundle units respectively constitute high temperature plate bundle unit and low temperature plate bundle unit, and the high temperature plate bundle unit and low temperature plate bundle unit are sealedly installed on the support bottom pry in proper order, and the lower part of the support bottom pry is connected with the bottom connection header; the hot side import header, hot side export header are sealedly installed in the upper portion of high temperature plate bundle unit and low temperature plate bundle unit respectively; the cold side import header, cold side export header are sealedly installed in the end of high temperature plate bundle unit and low temperature plate bundle unit, and the outside of high temperature plate bundle unit and low temperature plate bundle unit is sealedly connected with the outer pressure plate, in the utility model, if single plate bundle unit occurs corrosion or premature failure damage, single plate bundle unit can be replaced on the spot, and the subsequent maintenance cost of equipment is reduced, and simultaneously through setting the flow guide plate, gas scale is reduced, the flow characteristics of gas medium in the heat exchanger is strengthened, heat exchange efficiency is increased, and long period stable operation of equipment is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger design and manufacturing technology, and relates to a replaceable plate bundle unit fully welded plate type gas-to-gas heat exchanger. Background Technology

[0002] With the increasing urgency of industrial energy conservation and emission reduction, flue gas waste heat recovery technology has become a research hotspot. Traditional shell-and-tube heat exchangers, due to their low heat transfer efficiency, large footprint, and susceptibility to fouling, are unable to meet the requirements of high-temperature and corrosive flue gas treatment. Plate heat exchangers, with their high heat transfer efficiency, compact structure, and good anti-fouling ability, are gradually being widely used in boiler tail gas waste heat recovery, flue gas desulfurization, and CO2 capture.

[0003] Large-scale all-welded gas-to-gas heat exchangers often employ modular designs, focusing on modular manufacturing and assembly to improve production efficiency and ease of installation. However, when multiple heat transfer tubes leak, leading to the failure of a single plate bundle unit, partial replacement becomes difficult, often requiring complete scrapping or replacement of the entire unit. This not only results in significant resource waste but also leads to long manufacturing cycles for new equipment, impacting the long-term operation of in-service units. Therefore, developing an all-welded plate flue gas heat exchanger that combines high heat transfer efficiency with low maintenance costs is of great importance. Utility Model Content

[0004] This utility model provides a replaceable plate bundle unit fully welded plate gas-to-gas heat exchanger, which can solve the problem that when a single plate bundle unit of a large welded plate gas-to-gas heat exchanger fails, it is difficult to replace parts of the equipment or the entire equipment cannot be repaired, thus affecting the long-term stable operation of the equipment.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A fully welded plate-type gas-to-gas heat exchanger with replaceable plate bundle units includes single plate bundle units. Several single plate bundle units respectively form a high-temperature plate bundle unit and a low-temperature plate bundle unit. The high-temperature plate bundle unit and the low-temperature plate bundle unit are sequentially and sealed on a support skid. The lower part of the support skid is connected to a bottom connecting header. A hot-side inlet header and a hot-side outlet header are respectively and sealed on the upper part of the high-temperature plate bundle unit and the low-temperature plate bundle unit. A cold-side inlet header and a cold-side outlet header are sealed on the ends of the high-temperature plate bundle unit and the low-temperature plate bundle unit. The outer sides of the high-temperature plate bundle unit and the low-temperature plate bundle unit are sealed to an external pressure plate.

[0007] The support skid has square holes.

[0008] The single-board bundle unit is placed horizontally.

[0009] A guide plate is installed in the bottom connecting header.

[0010] The outer pressure plate is made of shaped steel and steel plates spliced ​​together.

[0011] When a plate bundle unit in this invention fails, during major overhaul and maintenance, separation is achieved simply by cutting the sealed weld connection between the outer pressure plate and the individual plate bundle unit using an oxyacetylene torch or a grinding wheel. The top individual plate bundle unit can then be removed from the high-temperature or low-temperature plate bundle unit. Replacement of the lower plate bundle unit is achieved by cutting the sealed weld connection between the middle connecting beam of the individual plate bundle and the outer pressure plate, and then placing the pre-fabricated new plate bundle unit in the removal position. This allows for rapid replacement of failed plate bundle units within a short time, shortening the product manufacturing cycle and reducing subsequent equipment maintenance costs. By installing a guide plate inside the bottom connecting header, the gas flow field is optimized, significantly increasing the gas velocity and thus enhancing heat transfer efficiency. This solves the problem of uneven flow field distribution at the inlet and outlet of traditional plate bundle units, which leads to localized overheating or low-temperature condensation, ensuring long-term stable operation of the equipment.

[0012] This utility model is a large welded plate gas-to-gas heat exchanger applicable to various flue gas waste heat recovery applications such as atmospheric and vacuum distillation furnaces, hydrogen production unit converters, and reforming furnaces. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the medium flow in this utility model;

[0015] Figure 3 This is a schematic diagram of the split structure of this utility model;

[0016] Figure 4 This is a schematic diagram of the support skid of this utility model;

[0017] Figure 5 This is a schematic diagram of the removal of the single-board bundle unit of this utility model;

[0018] Figure 6 This is a schematic diagram of the removal of the single-plate bundle unit of this utility model; In the figure: 1—high temperature plate bundle unit; 2—low temperature plate bundle unit; 3—hot side inlet header; 4—hot side outlet header; 5—cold side inlet header; 6—cold side outlet header; 201—single-plate bundle unit; 8—grid hole; 9—guide plate; 101—single-plate bundle unit; 201—support skid; 301—bottom connecting header; 401—outer pressure plate; Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments.

[0020] like Figure 1 , Figure 3As shown, a replaceable plate bundle unit fully welded plate gas-to-gas heat exchanger includes a conventional single plate bundle unit 101. Several single plate bundle units 101 respectively form a high-temperature plate bundle unit 1 and a low-temperature plate bundle unit 2. The high-temperature plate bundle unit 1 and the low-temperature plate bundle unit 2 are sequentially and sealed on a support skid 201. The lower part of the support skid 201 is connected to a bottom connecting header 301. The hot-side inlet header 3 and the hot-side outlet header 4 are respectively sealed on the upper part of the high-temperature plate bundle unit 1 and the low-temperature plate bundle unit 2. The cold-side inlet header 5 and the cold-side outlet header 6 are sealed on the ends of the high-temperature plate bundle unit 1 and the low-temperature plate bundle unit 2. The outer sides of the high-temperature plate bundle unit 1 and the low-temperature plate bundle unit 2 are connected and sealed to an external pressure plate 401.

[0021] The hot-side medium enters the plate bundle through the hot-side inlet header 3 and flows out through the hot-side outlet header 4. The cold-side medium enters the plate bundle through the cold-side inlet header 5, exchanges heat with the hot-side medium, and flows out through the cold-side outlet header 6.

[0022] like Figure 2 , Figure 3 As shown, the high-temperature plate bundle unit 1 consists of two single plate bundle units 101 and a supporting skid 201. The low-temperature plate bundle unit 2 consists of two single plate bundle units 101 and a supporting skid 201. It should be noted that the materials of the single plate bundle units 101 built into the high-temperature plate bundle unit 1 and the low-temperature plate bundle unit 2 can be the same or different, and can be selected according to the operating temperature and the characteristics of the cold and hot side media. The cold-side medium flows from left to right through the cold-side inlet header 5, passing through the interior of the high-temperature plate bundle unit 1 and the low-temperature plate bundle unit 2, and then through the cold-side outlet header 6. The hot-side medium flows from top to bottom through the hot-side inlet header 3, passing through the bottom connecting header 301 and then through the guide plate 9. The guide plate 9 is installed at both the inlet of the high-temperature plate bundle unit 1 and the outlet of the low-temperature plate bundle unit 2. The guide plate 9 evenly distributes the gas phase space at the inlet of the high-temperature plate bundle unit 1 and the outlet of the low-temperature plate bundle unit 2, increasing the flow velocity and evenly distributing it out of the hot-side outlet header 4. The two media achieve reverse cross-flow heat transfer through the partition wall channel of the single plate bundle unit 101.

[0023] like Figure 3 and Figure 4 As shown, to ensure the single-plate bundle unit 101 is fixed in position under gravity and to prevent cross-flow of media between the cold and hot sides, a support skid 201 is provided. The support skid is made of shaped steel or steel plates spliced ​​together to form multiple square holes 8. Figure 4 The diagram shows 12 square holes. These square holes allow the bottom skid to support the plate bundle unit without obstructing the flow of the hot-side medium in the vertical direction. By assembling the square holes 8 with the end of a single plate bundle unit and sealing the ends with welding, multiple plate bundle units can be made relatively independent, and the cold-side and hot-side process media can be prevented from flowing into each other.

[0024] like Figure 5 and Figure 6 As shown, if a leak is detected in the upper plate bundle unit during an airtightness inspection, only the four sides of the end of a single plate bundle unit 101 need to be separated, and the single plate bundle unit 101 can be lifted out individually (the inlet and outlet headers 4 need to be disassembled first), enabling rapid replacement of a single plate bundle unit. If a leak is detected in the lower plate bundle unit, the connection between the bottom plate bundle and the outer pressure plate needs to be cut and separated, and the single plate bundle unit 101 can be lifted out and replaced with a replacement unit, enabling rapid replacement of plate bundle units, shortening the product manufacturing cycle, and reducing subsequent equipment maintenance costs.

[0025] The single-plate bundle unit 101 constituting the high-temperature and low-temperature plate bundle unit is arranged horizontally, while the corrugated plate heat transfer element is arranged vertically to avoid condensate accumulation and to prevent dew point corrosion of the heat transfer element in the presence of acid dew.

[0026] like Figure 2 In the embodiment, the high and low temperature plate bundle units are each described using two single plate bundle units. In practice, other numbers of units can be used for combination. The number and specifications of the built-in plate bundle units can be changed according to actual needs.

[0027] The above description is only a preferred embodiment of this patent. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this patent, and these improvements and modifications should also be considered within the scope of protection of this patent.

Claims

1. A replaceable plate bundle unit fully welded plate type gas-to-gas heat exchanger, comprising a single plate bundle unit (101), characterized in that: Several single-plate bundle units (101) respectively form a high-temperature plate bundle unit (1) and a low-temperature plate bundle unit (2). The high-temperature plate bundle unit (1) and the low-temperature plate bundle unit (2) are sequentially and sealed on a support bottom skid (201). The lower part of the support bottom skid (201) is connected to the bottom connecting header (301). The hot-side inlet header (3) and the hot-side outlet header (4) are respectively sealed on the upper part of the high-temperature plate bundle unit (1) and the low-temperature plate bundle unit (2). The cold-side inlet header (5) and the cold-side outlet header (6) are sealed on the ends of the high-temperature plate bundle unit (1) and the low-temperature plate bundle unit (2). The outer side of the high-temperature plate bundle unit (1) and the low-temperature plate bundle unit (2) is sealed and connected to the outer pressure plate (401).

2. The replaceable plate bundle unit fully welded plate type gas-to-gas heat exchanger as described in claim 1, characterized in that: The support skid (201) has square holes (8) inside.

3. The replaceable plate bundle unit fully welded plate type gas-to-gas heat exchanger as described in claim 1, characterized in that: The single-board bundle unit (101) is placed horizontally.

4. A replaceable plate bundle unit fully welded plate type gas-to-gas heat exchanger as described in claim 1, characterized in that: A guide plate (9) is provided in the bottom connecting box (301).

5. A replaceable plate bundle unit fully welded plate type gas-to-gas heat exchanger as described in claim 1, characterized in that: The outer pressure plate (401) is made of shaped steel and steel plate splicing.

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