Multi-tube-pass heat exchanger and using method thereof
By introducing insulation structures and U-shaped bent tube bundles into multi-pass heat exchangers, the problem of high-temperature gas outlet overheating is solved, achieving precise gas temperature control and cost savings, and showing good application prospects.
Patent Information
- Application Number
- CN202511294212.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-11
- Publication Date
- 2025-11-28
AI Technical Summary
In existing multi-pass heat exchangers, the outlet gas temperature often exceeds the design value during high-temperature gas heat exchange, and existing solutions increase equipment cost and size.
Design a multi-pass heat exchanger, including a tube box section and a heat exchange section, using insulated structural components and partition plates, physically separating the upper and lower chambers through insulation plates and insulation materials, and combining U-shaped bent heat exchange tube bundles to achieve effective cooling of high-temperature gas.
It effectively prevents the outlet gas from overheating, reduces energy consumption and equipment investment, ensures that the gas temperature reaches the design value, has a simple and reasonable structure, and is widely used.
Smart Images
Figure CN121025837A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of heat exchange equipment, and relates to a multi-tube-pass heat exchanger and a use method thereof. BACKGROUND
[0002] The multi-tube-pass heat exchanger is a device for improving heat exchange efficiency by increasing multiple times of fluid back-and-forth flow in the heat exchange tube. As a kind of high-efficiency heat exchange equipment, the multi-tube-pass heat exchanger is compact in structure, simple in operation, and widely applied in the industrial fields of chemical industry, electric power, petroleum and the like.
[0003] In the prior art, when the multi-tube-pass heat exchanger is designed, high-temperature gas (greater than 150℃) enters from the inlet of the multi-tube-pass heat exchanger, and needs to reach the outlet temperature (less than 32℃) designed at the outlet after heat exchange with cooling water. However, in actual operation, the outlet gas temperature is often above 40℃, which seriously deviates from the designed value. In order to solve this problem, the prior art adopts measures such as increasing the heat exchange area of the heat exchanger or reducing the flow of the gas. However, these measures increase the overall weight and volume of the heat exchanger, increase the installation position and space layout requirements of the heat exchanger, and further increase the equipment investment cost.
[0004] Therefore, the present application provides a multi-tube-pass heat exchanger and a use method thereof, so as to overcome the above problems. SUMMARY
[0005] The present application aims to overcome the deficiencies in the prior art, and provides a multi-tube-pass heat exchanger and a use method thereof, which are simple and reasonable in structure, good in outlet gas over-temperature prevention effect, low in cost, and wide in use range.
[0006] The present application is implemented by the following technical scheme: a multi-tube-pass heat exchanger, which comprises a tube box section and a heat exchange section, and the two parts are connected through flanges. The tube box section is provided with a gas inlet and a gas outlet. The gas inlet is connected with the inlet of the heat exchange section, and the gas outlet is connected with the outlet at the end of the tube box to form a loop. A plurality of curved heat exchange tube bundles are arranged in the heat exchange section. One end of the heat exchange tube bundle is connected with the inlet, and the other end is connected with the outlet. Cooling liquid inlets and cooling liquid outlets are arranged on the heat exchange section, and the gas in the heat exchange tube bundle is cooled by the cooling liquid.
[0007] Preferably, a split-range partition plate is arranged in the tube box section, which divides the tube box section into left and right chambers. A transverse partition plate is further arranged in the left chamber, which divides the left chamber into upper and lower chambers. The gas inlet is arranged in the left upper chamber, and the gas outlet is arranged in the left lower chamber. The left upper chamber is connected with the inlet of the heat exchange section, and the left lower chamber is connected with the outlet of the heat exchange section.
[0008] As preferred, a heat insulation structure assembly is arranged in the left upper chamber, which is composed of a heat insulation plate and a heat insulation material, wherein the heat insulation plate is composed of a heat insulation plate one and a heat insulation plate two, which are respectively installed at the left upper chamber near the split range baffle and the horizontal baffle, and a gap is left between the heat insulation plate and the split range baffle and the horizontal baffle, and the gap is used to place the heat insulation material, and the heat insulation structure assembly is used to physically isolate the upper and lower chambers to prevent the cooled gas in the lower chamber from being heated by the inflowing hot gas in the upper chamber.
[0009] As preferred, the heat exchange pipe bundle in the heat exchange section is provided with two rows, wherein the left row of pipes is composed of an upper pipe and a lower pipe, and the right row of pipes is a whole row of pipes, and the two rows of pipes are connected through the U-shaped bends arranged on the opposite sides, wherein the upper pipe is connected with the left upper chamber, and the lower pipe is connected with the left lower chamber, and the liquid enters the left upper chamber, flows into the opposite side through the upper pipe, returns to the right chamber through the U-shaped bend on the opposite side, and then flows out of the left lower chamber after flowing into the U-shaped bend on the opposite side from the lower part of the right chamber.
[0010] As preferred, the pipe box section is provided with a cooling liquid outlet on one side near the inlet, and a cooling liquid inlet on the other side.
[0011] As preferred, the heat exchange pipe bundle in the heat exchange section is welded by straight pipes and U-shaped bends or is directly bent by the heat exchange pipe bundle.
[0012] A use method of the multi-pipe-pass heat exchanger, which comprises coupling the working of the gas flow channel and the working of the cooling liquid flow channel, wherein the working method of the gas flow channel is as follows: 1) high-temperature gas flows into the left upper chamber through the gas inlet, flows into the upper pipe through the left upper chamber, flows into the U-shaped bend on the opposite side through the upper pipe, returns to the upper part of the right chamber, and then flows into the lower part of the right chamber through gravity and returns to the opposite side, and then flows back to the left lower chamber through the U-shaped bend on the opposite side to complete the whole cooling; 2) in the process of flowing in the hot gas in step 1), the cooling liquid also flows in from the lower cooling liquid inlet, flows to the upper cooling liquid outlet through the flow path formed by the bending of the heat exchange pipe bundle in the pipe box section, and completes the whole cycle.
[0013] The beneficial effects of the present application are as follows: The multi-pipe-pass heat exchanger designed in the present application prevents the high-temperature gas from transferring heat to the outlet gas through the split range baffle when the high-temperature gas passes through the heat insulation structure assembly (heat insulation plate and heat insulation material) arranged at the high-temperature gas inlet of the multi-pipe-pass heat exchanger, so that the outlet gas will not be overheated after the high-temperature gas passes through the multi-pipe-pass heat exchange, and the process technical requirements are met.
[0014] The multi-tube pass heat exchanger is novel and unique in whole, is ingenious in design, is simple in structure, can effectively prevent over-temperature of outlet gas, guarantees that the multi-tube pass heat exchanger reaches a good design effect, saves energy consumption and equipment investment, completely changes the design defects existing in the prior art of the multi-tube pass heat exchanger, and has good practical value and wide application prospect. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a whole structure schematic view of the present application.
[0016] Figure 2 It is an A-A sectional view of the present application. Figure 1 DETAILED DESCRIPTION
[0017] In order for those skilled in the art to more clearly understand the purpose, technical scheme and advantages of the present application, the present application will be further described below in combination with the drawings and examples.
[0018] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms such as "up", "down", "left", "right", "inner", "outer", "horizontal", "vertical" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0019] The present application will be described in detail below in combination with the drawings: as shown in Figure 1 A multi-tube pass heat exchanger, which comprises a tube box section 1 and a heat exchange section 2, the two parts are connected through flanges 3, the tube box section 1 is provided with an air inlet 4 and an air outlet 5, the air inlet 4 is connected with the inlet on the heat exchange section 2, the air outlet 5 is connected with the outlet on the tube box end 1 to form a loop, a plurality of curved heat exchange tube bundles 6 are arranged inside the heat exchange section 2, one end of the heat exchange tube bundle 6 is connected with the inlet, the other end is connected with the outlet, and a cooling liquid inlet 7 and a cooling liquid outlet 8 are respectively arranged on the heat exchange section 2, and the gas in the heat exchange tube bundle 6 is cooled by the cooling liquid.
[0020] A split section plate 9 is arranged inside the tube box section 1, the split section plate 9 divides the tube box section 1 into left and right two chambers, a transverse partition plate 11 is further arranged in the left chamber 10, the transverse partition plate 11 divides the left chamber 10 into upper and lower two chambers, the left upper chamber 12 is provided with the air inlet 4, and the left lower chamber 13 is provided with the air outlet 5, the left upper chamber 12 is connected with the inlet on the heat exchange section 2, and the left lower chamber 13 is connected with the outlet on the heat exchange section 2.
[0021] As Figure 2 As shown, the left upper chamber 12 is also arranged with a heat insulation structure assembly, which is composed of a heat insulation plate 14 and a heat insulation material 15, wherein the heat insulation plate 14 is composed of a heat insulation plate one 16 and a heat insulation plate two 17, which are respectively installed at the left upper chamber 12 close to the split range baffle 9 and the transverse baffle 11, and a certain gap 18 is left between the heat insulation plate one 16 and the heat insulation plate two 17 and the split range baffle 9 and the transverse baffle 11, and the gap 18 is used to place the heat insulation material 15, so that the upper and lower chambers are physically isolated through the heat insulation structure assembly, and the cooled gas in the lower chamber is prevented from being caused to increase in temperature due to the inflow of hot gas in the upper chamber.
[0022] The heat exchange pipe bundle 6 in the heat exchange section 2 is provided with two rows, wherein the left row of pipes is composed of an upper pipe 19 and a lower pipe 20, and the right row of pipes is a whole row of pipes, and the two rows of pipes are connected through the U-shaped bends arranged on the opposite sides (not shown in the figure), wherein the upper pipe 19 is connected with the left upper chamber 12, and the lower pipe 20 is connected with the left lower chamber 13, liquid enters the left upper chamber 12, flows into the opposite side along the upper pipe 19, flows back to the right chamber through the U-shaped bend on the opposite side, and then flows back to the left lower chamber 13 after flowing into the U-shaped bend on the opposite side from the lower part of the right chamber. The pipe box section 1 is provided with a cooling liquid outlet 8 on one side close to the inlet, and a cooling liquid inlet 7 is provided on the opposite side. The heat exchange pipe bundle 6 in the heat exchange section 2 is welded by straight pipes and U-shaped bends or directly formed by bending the heat exchange pipe bundle.
[0023] A use method of a multi-tube-pass heat exchanger, the method comprising coupling the working of a gas flow channel and the working of a cooling liquid flow channel, wherein the working method of the gas flow channel is as follows: 1) high-temperature gas flows into the left upper chamber 12 through the gas inlet 4, flows into the upper pipe 19 through the left upper chamber 12, flows back to the upper part of the right chamber through the U-shaped bend on the opposite side through the upper pipe 19, and then flows into the lower part of the right chamber by gravity and returns to the opposite side, and then flows back to the left lower chamber 13 through the U-shaped bend on the opposite side to complete the whole cooling; 2) in the process of flowing in the hot gas in step 1), the cooling liquid also flows in from the lower cooling liquid inlet 7, flows to the upper cooling liquid outlet 8 through the flow path formed by the bending of the heat exchange pipe bundle 6 in the pipe box section 1, and completes the whole cycle.
[0024] The working process of the application is as follows: The cooled medium is gas and the cooling medium is liquid. The high-temperature gas to be cooled enters the device from the gas inlet 4 at the upper part of the tube box section 1, and the low-temperature cooled gas flows out from the gas outlet at the lower part of the tube box section. The cooling medium enters from the cooling liquid inlet 7 of the heat exchange section 2, and the cooled gas flows out from the cooling liquid outlet 8 of the heat exchange section 2. When the high-temperature gas enters from the gas inlet of the tube box section, the heat insulation structure assembly can effectively prevent the high-temperature gas from directly heating the outlet low-temperature gas through the sub-range partition plate, thereby preventing the outlet gas from being overheated. That is, the high-temperature gas enters the tube box section provided with the heat insulation structure assembly from the gas inlet, then enters the heat exchange tube bundle of the heat exchange section from the tube box section, and finally flows out from the gas outlet at the lower part of the tube box section after multiple heat exchanges in the heat exchange tube bundle of the heat exchange section, so that the outlet gas temperature can accurately reach the designed outlet temperature value.
[0025] The whole device structure is simple and reasonable, the heat insulation structure can effectively prevent the outlet gas from being overheated, ensure that the multi-tube pass heat exchanger achieves good design effect, saves energy consumption and equipment investment, and completely changes the design defects of the existing multi-tube pass heat exchanger technology, has good practical value and broad application prospect.
[0026] The specific embodiments described herein are merely illustrative of the principles of the present application and its efficacy, and are not intended to limit the present application. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical idea of the present application should be covered by the claims of the present application.
Claims
1. A multi-pass heat exchanger, comprising a tube box section and a heat exchange section, the two parts being connected by a flange, characterized in that, The tube box section is provided with an air inlet and an air outlet. The air inlet is connected to the inlet on the heat exchange section, and the air outlet is connected to the outlet on the tube box end to form a loop. The heat exchange section has multiple curved heat exchange tube bundles inside. One end of the heat exchange tube bundle is connected to the inlet, and the other end is connected to the outlet. A coolant inlet and a coolant outlet are provided on the heat exchange section to cool the gas inside the heat exchange tube bundle through the coolant.
2. The multi-pass heat exchanger according to claim 1, characterized in that, The tube box section is equipped with a partition plate that divides the tube box section into two chambers, left and right. In the left chamber, there is also a transverse partition plate that divides the left chamber into two chambers, upper and lower. The upper left chamber is equipped with an air inlet, and the lower left chamber is equipped with an air outlet. The upper left chamber is connected to the inlet of the heat exchange section, and the lower left chamber is connected to the outlet of the heat exchange section.
3. The multi-pass heat exchanger according to claim 2, characterized in that, A heat insulation structure assembly is also arranged in the upper left cavity. The heat insulation structure assembly consists of a heat insulation plate and heat insulation material. The heat insulation plate consists of heat insulation plate one and heat insulation plate two, which are respectively installed in the upper left cavity near the partition plate and the transverse partition plate. A certain gap is left between it and the partition plate and the transverse partition plate. The gap is used to place the heat insulation material. The heat insulation structure assembly physically isolates the upper and lower cavities, preventing the cooled gas in the lower cavity from being heated by the hot air flowing in from above.
4. The multi-pass heat exchanger according to claim 2, characterized in that, The heat exchange tube bundle inside the heat exchange section is arranged in two rows. The left row consists of an upper pipe and a lower pipe, while the right row is a whole row of pipes. Both pipes are connected by U-shaped bends arranged on opposite sides. The upper pipe is connected to the upper left chamber, and the lower pipe is connected to the lower left chamber. After entering the upper left chamber, the liquid flows along the upper pipe to the opposite side, flows back to the right chamber through the U-shaped bend on the opposite side, flows from below the right chamber to the U-shaped bend on the opposite side, and then flows back to the lower left chamber and out.
5. The multi-pass heat exchanger according to claim 2, characterized in that, The pipe section has a coolant outlet on the side near the inlet and a coolant inlet on the opposite side below.
6. The multi-pass heat exchanger according to claim 2, characterized in that, The heat exchange tube bundle inside the heat exchange section is formed by welding straight tubes and U-shaped bends or by directly bending the heat exchange tube bundle.
7. A method of using a multi-pass heat exchanger according to any one of claims 1-6, characterized in that, The method involves the coupled operation of the gas flow channel and the coolant flow channel, wherein the operation method of the gas flow channel is as follows: 1) The high-temperature gas flows into the upper left chamber through the air inlet, then into the upper pipe through the upper left chamber, then into the U-shaped bend on the opposite side and flows back to the upper position in the right chamber. Then, it flows into the lower right chamber by gravity and returns to the opposite side. Finally, it flows back into the lower left chamber through the U-shaped bend on the opposite side to complete the entire cooling process. 2) During the process of hot air flowing in from step 1), coolant also flows in from the coolant inlet below, and flows through the flow path formed by the bending of the heat exchange tube bundle inside the tube box section to the coolant outlet above, completing the entire cycle.