Multi-tube pass heat exchanger

Abstract

The utility model discloses a multi -tube -pass heat exchanger, it includes the pipe box section and the heat exchange section two parts, two parts are connected through the flange, be provided with the gas inlet and the gas outlet on the pipe box section, and the gas inlet is connected with the import on the heat exchange section, and the gas outlet is connected with the export on the pipe box end and forms the loop, the inside of pipe box section is provided with the partial journey baffle, and this partial journey baffle divides the left and right two chambers in the pipe box section, wherein still arranging a transverse baffle in the left chamber, and the transverse baffle divides the left chamber into two chambers, and arranging the heat insulation structure assembly in the left upper chamber, and the heat insulation structure assembly is composed of the heat insulation plate and the heat insulation material. The whole device simple and reasonable structure of the utility model, the heat insulation structure can effectively prevent the export gas overtemperature, guarantees the multi -tube -pass heat exchanger to reach the good design effect, saves the energy consumption and equipment investment, thoroughly changes the design defect of the existing technology of the multi -tube -pass heat exchanger, has the good practical value and the broad application prospect.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchange equipment and relates to a multi-pass heat exchanger. Background Technology

[0002] A multi-pass heat exchanger is a device that improves heat exchange efficiency by increasing the number of times the fluid flows back and forth within the heat exchange tubes. As a highly efficient heat exchange device, the multi-pass heat exchanger has a compact structure, is easy to operate, and is widely used in chemical, power, petroleum and other industrial fields.

[0003] In existing technologies, multi-pass heat exchangers are designed so that high-temperature gas (greater than 150°C) enters through the inlet and, after passing through multiple tubes and exchanging heat with cooling water, needs to reach the designed outlet temperature (less than 32°C). However, in actual operation, the outlet gas temperature often exceeds 40°C, significantly deviating from the design value. Existing technologies address this problem by increasing the heat exchanger's heat exchange area or reducing the gas flow rate. However, these measures increase the overall weight and volume of the heat exchanger, increase the installation location and space requirements, and consequently increase equipment investment costs.

[0004] To address this issue, a multi-pass heat exchanger was designed to overcome the aforementioned problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a multi-pass heat exchanger with a simple and reasonable structure, good anti-overheating effect of outlet gas, low cost, and wide range of applications.

[0006] This utility model is achieved through the following technical solution: a multi-pass heat exchanger, comprising a tube box section and a heat exchange section, which are connected by a flange. 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 contains multiple curved heat exchange tube bundles, one end of which is connected to the inlet and the other end 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 bundles through the coolant.

[0007] Preferably, the tube box section is provided with a partition plate that divides the tube box section into two chambers, left and right. In the left chamber, a transverse partition is also arranged, which 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 on the heat exchange section, and the lower left chamber is connected to the outlet on the heat exchange section.

[0008] Preferably, 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 the heat insulation structure assembly 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 rising in temperature due to the hot air flowing in from above.

[0009] Preferably, 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.

[0010] Preferably, the pipe section has a coolant outlet on the side near the inlet and a coolant inlet on the opposite side below.

[0011] Preferably, 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.

[0012] The beneficial effects of this utility model are as follows: The multi-pass heat exchanger designed in this utility model, by setting baffles and heat insulation structure components (heat insulation plate and heat insulation material) at the high-temperature gas inlet of the multi-pass heat exchanger, prevents the high-temperature gas from transferring heat to the outlet gas through the partitions when passing through the heat insulation structure components. After the high-temperature gas passes through the multi-pass heat exchange, the outlet gas will not exceed the temperature, thus meeting the requirements of the process technology.

[0013] The multi-pass heat exchanger designed in this utility model is novel and unique, with ingenious design and simple structure. The heat insulation structure can effectively prevent the outlet gas from overheating, ensuring that the multi-pass heat exchanger achieves good design results, saving energy consumption and equipment investment. It completely changes the design defects of existing multi-pass heat exchanger technology, and has good practical value and broad application prospects. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 for Figure 1 AA sectional view. Detailed Implementation

[0016] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1 As shown, a multi-pass heat exchanger includes a tube box section 1 and a heat exchange section 2, which are connected by a flange 3. The tube box section 1 is provided with an air inlet 4 and an air outlet 5. The air inlet 4 is connected to the inlet on the heat exchange section 2, and the air outlet 5 is connected to the outlet on the tube box section 1 to form a loop. The heat exchange section 2 has multiple curved heat exchange tube bundles 6 inside. One end of the heat exchange tube bundle 6 is connected to the inlet, and the other end is connected to the outlet. A coolant inlet 7 and a coolant outlet 8 are respectively provided on the heat exchange section 2 to cool the gas inside the heat exchange tube bundle 6 through the coolant.

[0019] The tube box section 1 is provided with a partition 9, which divides the tube box section 1 into two chambers, left and right. In the left chamber 10, there is also a transverse partition 11, which divides the left chamber 10 into two chambers, upper and lower. The upper left chamber 12 is equipped with an air inlet 4, and the lower left chamber 13 is equipped with an air outlet 5. The upper left chamber 12 is connected to the inlet on the heat exchange section 2, and the lower left chamber 13 is connected to the outlet on the heat exchange section 2.

[0020] like Figure 2 As shown, a heat insulation structure assembly is also arranged in the upper left chamber 12. The heat insulation structure assembly consists of a heat insulation plate 14 and a heat insulation material 15. The heat insulation plate 14 consists of a heat insulation plate 16 and a heat insulation plate 17, which are respectively installed in the upper left chamber 12 near the partition plate 9 and the transverse partition plate 11. A certain gap 18 is left between it and the partition plate 9 and the transverse partition plate 11. The gap 18 is used to place the heat insulation material 15. The heat insulation structure assembly physically isolates the upper and lower chambers to prevent the cooled gas in the lower chamber from rising in temperature due to the hot air flowing in from above.

[0021] The heat exchange tube bundle 6 inside the heat exchange section 2 has two rows. The left row consists of an upper pipe 19 and a lower pipe 20, while the right row is a single, continuous pipe. Both pipes are connected by U-shaped bends (not shown in the figure) on opposite sides. The upper pipe 19 connects to the upper left chamber 12, and the lower pipe 20 connects to the lower left chamber 13. After entering the upper left chamber 12, the liquid flows along the upper pipe 19 to the opposite side, then flows back to the right chamber through the U-shaped bend. After flowing from below the right chamber to the opposite U-shaped bend, it flows back to the lower left chamber 13 and out. The tube box section 1 has a coolant outlet 8 on the side near the inlet and a coolant inlet 7 on the opposite side below. The heat exchange tube bundle 6 inside the heat exchange section 2 is formed by welding straight pipes and U-shaped bends or by directly bending the heat exchange tube bundle.

[0022] A method of using a multi-pass heat exchanger, the method comprising coupled operation of a gas flow channel and a coolant flow channel, wherein the operation of the gas flow channel is as follows: 1) The high-temperature gas flows into the upper left chamber 12 through the air inlet 4, then into the upper pipe 19 through the upper left chamber 12, then into the U-shaped bend on the opposite side through the upper pipe 19 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 13 through the U-shaped bend on the opposite side to complete the entire cooling process.

[0023] 2) During the process of hot air flowing in from step 1), coolant also flows in from the coolant inlet 7 below, and flows through the flow path formed by the bending of the heat exchange tube bundle 6 inside the tube box section 1 to the coolant outlet 8 above, completing the entire cycle.

[0024] The working process of this utility model is as follows: In operation, the multi-pass heat exchanger of this invention uses a gas as the medium to be cooled and a liquid as the cooling medium. The high-temperature gas to be cooled enters the device through the inlet 4 at the top of the tube box section 1, and the cooled low-temperature gas exits through the outlet at the bottom of the tube box section. The cooling medium enters through the coolant inlet 7 of the heat exchange section 2, and after cooling the gas, it exits through the coolant outlet 8 of the heat exchange section 2. When the high-temperature gas enters through the inlet of the tube box section, the insulation structure effectively insulates against heat transfer, preventing the high-temperature gas from directly transferring heat to the low-temperature gas at the outlet through the partition plates, thus preventing the outlet gas from overheating. In other words, the high-temperature gas enters the tube box section equipped with the insulation structure through the inlet, then enters the heat exchange tube bundle in the heat exchange section. After multiple heat exchanges through multiple passes in the heat exchange tube bundle, it exits through the outlet at the bottom of the tube box section, ensuring that the outlet gas temperature accurately reaches the designed outlet temperature value.

[0025] The entire device of this utility model has a simple and reasonable structure. The heat insulation structure can effectively prevent the outlet gas from overheating, ensuring that the multi-pass heat exchanger achieves good design results, saving energy consumption and equipment investment, and completely changing the design defects of the existing multi-pass heat exchanger technology. It has good practical value and broad application prospects.

[0026] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

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 equipped with an air inlet and an air outlet. A partition plate inside the tube box section divides the interior into left and right chambers. A transverse partition in the left chamber further divides it into upper and lower chambers. The upper left chamber has an air inlet, and the lower left chamber has an air outlet. The air inlet connects to the inlet on the heat exchange section, and the air outlet connects to the outlet on the tube box end, forming a loop. The upper left chamber connects to the inlet on the heat exchange section, and the lower left chamber connects to the outlet on the heat exchange section. Multiple curved heat exchange tube bundles are installed inside the heat exchange section. One end of each tube bundle connects to the inlet, and the other end connects to the outlet. A coolant inlet and a coolant outlet are also provided on the heat exchange section to cool the gas inside the heat exchange tube bundles.

2. The multi-pass heat exchanger according to claim 1, 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.

3. The multi-pass heat exchanger according to claim 1, 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.

4. The multi-pass heat exchanger according to claim 1, characterized in that, The pipe section has a coolant outlet on the side closest to the inlet and a coolant inlet on the opposite side below.

5. The multi-pass heat exchanger according to claim 1, 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.

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