Thermal expansion built-in high-temperature gas-gas heat exchanger
By adopting the expansion joint connection structure between the floating tube plate and the intermediate tube plate in the high-temperature gas heat exchanger, the problem of thermal expansion cannot be released in time is solved, the built-in absorption of thermal expansion is achieved, the damage to the air duct and heat exchange pipe is avoided, and the safety and life of the equipment are improved.
Patent Information
- Application Number
- CN202422286445.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-19
AI Technical Summary
In existing high-temperature flue gas and low-temperature air heat exchangers, the thermal expansion of the heat exchange tube cannot be released in time, resulting in damage to the air duct and heat exchange tube, especially under high temperature conditions.
The floating tube plate and the intermediate tube plate are connected by expansion joints, and the intermediate tube plate and air duct are connected by flanges to absorb heat expansion and avoid thermal expansion from being transmitted outward. It is designed as a built-in thermal expansion structure.
Effectively absorb heat expansion, avoid damage to heat exchange pipes and air ducts, improve the temperature and operation safety of the equipment, and extend the equipment life.
Smart Images
Figure CN223165983U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of high-temperature heat exchangers, in particular to a heat expansion built-in high-temperature gas-gas heat exchanger. Background Art
[0002] In the prior art, for a gas-gas tubular heat exchanger used for heat exchange between high-temperature flue gas and low-temperature air, fixed tube sheets are usually arranged at both ends of the heat exchange tubes. The fixed tube sheets are fixedly connected to the heat exchange tubes for supporting the heat exchange tubes. After the high-temperature flue gas passes through the heat exchange tubes, the heat exchange tubes expand due to heat. Since the tube sheets are fixedly arranged and the heat exchange tubes are fixedly connected to the fixed tube sheets, the thermal expansion will be transmitted to the air duct directly connected to the heat exchanger, causing damage to the air duct. Moreover, in the case where the flue gas temperature is particularly high, for example, when the flue gas temperature reaches 800 °C, the thermal expansion cannot be released in time, which will cause the heat exchange tubes to deform. Summary of the Utility Model
[0003] Aiming at the deficiencies of the prior art, the utility model provides a heat expansion built-in high-temperature gas-gas heat exchanger, aiming to absorb the thermal expansion in time to avoid damage to the air duct caused by the outward transmission of the thermal expansion or damage to the heat exchange tubes caused by untimely transmission.
[0004] The technical scheme adopted by the utility model is as follows:
[0005] A heat expansion built-in high-temperature gas-gas heat exchanger includes a fixed tube sheet, a plurality of heat exchange tubes, an intermediate tube sheet, a connecting flange, a floating tube sheet and an air duct. The fixed tube sheet is fixedly arranged, the floating tube sheet is suspended, the plurality of heat exchange tubes are arranged in parallel at intervals, and both ends of each heat exchange tube are fixedly supported by the fixed tube sheet and the floating tube sheet respectively. The flow channel in the heat exchange tube is communicated with the air duct;
[0006] The intermediate tube sheet is fixedly arranged and is located between the fixed tube sheet and the floating tube sheet. The intermediate tube sheet is connected to the floating tube sheet through an expansion joint. The intermediate tube sheet is provided with a relief hole for the heat exchange tube to pass through. The inner diameter of the relief hole is smaller than the outer diameter of the heat exchange tube, and the relief hole does not contact the heat exchange tube passing through it;
[0007] The intermediate tube sheet is connected to the outlet end of the air duct through a connecting flange, so that the expansion joint and the floating tube sheet are covered in the connecting flange.
[0008] A further technical scheme is:
[0009] The bottom of the fixed tube sheet is welded to the fixed base.
[0010] The bottom of the intermediate tube sheet is welded to the fixed base.
[0011] The outer walls of both ends of the heat exchange tube are respectively welded to the fixed tube sheet and the floating tube sheet.
[0012] The heat exchange tubes are made of 310s stainless steel tubes.
[0013] The beneficial effects of the present utility model are as follows:
[0014] By providing a floating tube sheet and an intermediate tube sheet, and connecting the two with an expansion joint, and at the same time connecting the intermediate tube sheet to the air duct with a flange, the heat expansion is absorbed through the expansion joint, avoiding damage to the heat exchange tubes, tube sheets and air ducts, increasing the upper limit of the temperature of the heat exchange flue gas applicable, and greatly improving the operating safety and stability, and prolonging the service life of the equipment.
[0015] Other features and advantages of the present utility model will be described in the subsequent description, or will be understood by implementing the present utility model. Brief Description of the Drawings
[0016] Figure 1 It is a schematic structural view of an embodiment of the present utility model.
[0017] Figure 2 It is a schematic structural view of the floating tube sheet of an embodiment of the present utility model.
[0018] In the figure: 1, fixed tube sheet; 2, intermediate tube sheet; 3, connecting flange; 4, expansion joint; 5, heat exchange tube; 6, floating tube sheet; 7, air duct; 21, relief hole. Detailed Description of the Embodiment
[0019] The following combines the drawings to illustrate the detailed implementation manners of the present utility model.
[0020] As Figure 1 and Figure 2 shown, the heat expansion built-in high-temperature gas-gas heat exchanger of this embodiment includes a fixed tube sheet 1, a plurality of heat exchange tubes 5, an intermediate tube sheet 2, a connecting flange 3, a floating tube sheet 6 and an air duct 7. The fixed tube sheet 1 is fixedly arranged, the floating tube sheet 6 is suspended, the plurality of heat exchange tubes 5 are arranged in parallel at intervals, and both ends of each heat exchange tube 5 are fixedly supported by the fixed tube sheet 1 and the floating tube sheet 6 respectively. The flow channel in the heat exchange tube 5 is communicated with the air duct 7;
[0021] The intermediate tube sheet 2 is fixedly arranged and is located between the fixed tube sheet 1 and the floating tube sheet 6. The intermediate tube sheet 2 is connected to the floating tube sheet 6 through an expansion joint 4. The intermediate tube sheet 2 is provided with a relief hole 21 for the heat exchange tube 5 to pass through. The inner diameter of the relief hole 21 is smaller than the outer diameter of the heat exchange tube 5, and there is no contact between the relief hole 21 and the heat exchange tube 5 passing through it;
[0022] The intermediate tube sheet 2 is connected to the outlet end of the air duct 7 through a connecting flange 3, so that the expansion joint 4 and the floating tube sheet 6 are covered inside the connecting flange 3.
[0023] Specifically, the bottom of the fixed tube sheet 1 is welded to the fixed base.
[0024] Specifically, the bottom of the intermediate tube sheet 2 is welded to the fixed base.
[0025] Specifically, the outer walls of both ends of the heat exchange tube 5 are respectively welded and fixed to the fixed tube sheet 1 and the floating tube sheet 6.
[0026] Specifically, the heat exchange tube 5 is made of 310s stainless steel tube.
[0027] The working principle of the thermal expansion built-in high-temperature gas-gas heat exchanger of this embodiment:
[0028] See Figure 1 , the cold air in the air duct 7 flows into the connecting flange 3 from the outlet end of the air duct 7, flows into the heat exchange tube 5 from the right end, flows along the flow channel in the heat exchange tube 5 and flows out from the left end. The high-temperature flue gas (about 800 °C) flows through the heat exchange tube 5 vertically and exchanges heat with the cold air in the heat exchange tube 5 to realize flue gas cooling and cold air heating. The thermal expansion of the heat exchange tube caused by the high-temperature flue gas is transmitted to one end of the floating tube sheet 6 and then absorbed by the expansion joint 4. The expansion joint 4 can make the floating tube sheet 6 have a small displacement, thus avoiding damage to the heat exchange tube caused by thermal expansion. At the same time, there is a clearance margin between the relief hole 21 of the intermediate tube sheet 2 and the heat exchange tube 5, so it will not be damaged either. The intermediate tube sheet 2 and the air duct 7 can cover the expansion joint 4 and the floating tube sheet 6 therein through the connecting flange 3 to realize the built-in thermal expansion, thus avoiding damage to the air duct 7.
[0029] Those of ordinary skill in the art can understand that the above description is only the preferred embodiment of the present invention and is not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A thermally expanded built-in high-temperature gas-gas heat exchanger, characterized in that, It includes a fixed tube sheet (1), a number of heat exchange tubes (5), an intermediate tube sheet (2), a connecting flange (3), a floating tube sheet (6) and an air duct (7). The fixed tube sheet (1) is fixedly arranged, the floating tube sheet (6) is suspended, the number of heat exchange tubes (5) are arranged in parallel at intervals, and both ends of each heat exchange tube (5) are fixedly supported by the fixed tube sheet (1) and the floating tube sheet (6) respectively. The flow channel in the heat exchange tube (5) is communicated with the air duct (7). The intermediate tube sheet (2) is fixedly arranged and located between the fixed tube sheet (1) and the floating tube sheet (6). The intermediate tube sheet (2) is connected to the floating tube sheet (6) through an expansion joint (4). The intermediate tube sheet (2) is provided with a relief hole (21) for the heat exchange tube (5) to pass through. The inner diameter of the relief hole (21) is smaller than the outer diameter of the heat exchange tube (5), and the relief hole (21) is not in contact with the heat exchange tube (5) passing through it. The intermediate tube sheet (2) is connected to the outlet end of the air duct (7) through the connecting flange (3), so that the expansion joint (4) and the floating tube sheet (6) are covered in the connecting flange (3).
2. The internally thermally expanded high-temperature gas-gas heat exchanger according to claim 1, characterized in that, The bottom of the fixed tube sheet (1) is welded to the fixed base.
3. The built-in high-temperature gas-gas heat exchanger with thermal expansion according to claim 1, characterized in that, The bottom of the intermediate tube sheet (2) is welded to the fixed base.
4. The internally thermally expanded high-temperature gas-gas heat exchanger according to claim 1, characterized in that, The outer walls of both ends of the heat exchange tube (5) are respectively welded to the fixed tube sheet (1) and the floating tube sheet (6).
5. The built-in high-temperature gas-gas heat exchanger with thermal expansion according to claim 1, wherein, The heat exchange tube (5) is made of 310s stainless steel tube.