Gasoline hydrogenation heat exchange device

Abstract

The invention discloses a gasoline hydrogenation heat exchange device, and relates to the technical field of gasoline refinement, the gasoline hydrogenation heat exchange device comprises a shell, a heat exchange tube and a through hole, fixed baffling pieces and movable baffling pieces are arranged in the shell at intervals, and the distances between the multiple fixed baffling pieces and the multiple movable baffling pieces are sequentially increased in the medium flowing direction and form a gradual change type structure; an elastic piece with the elasticity changed after being heated is arranged between every two adjacent movable baffling pieces, adjusting assemblies penetrating through the heat exchange pipes are arranged on the movable baffling pieces, and the adjusting assemblies can adjust the gaps between the through holes and the heat exchange pipes along with temperature changes. The distances between the multiple fixed baffling pieces and the multiple movable baffling pieces are sequentially increased in the medium flowing direction to form a gradual change type structure, and therefore the device can adjust the flow speed of heavy gasoline in the front stage, the middle stage and the later stage of heat exchange according to the characteristics of the heavy gasoline, and the problem of laminar flow or coking of the heavy gasoline in the heat exchange process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of gasoline refining, and particularly to a gasoline hydrogenation heat exchange device. Background Art

[0002] The catalytic gasoline hydrogenation process is widely used in major refineries due to its advantages such as mild operating conditions, high desulfurization rate, low hydrogen consumption, and small octane number loss. This process usually adopts a process flow of full-range gasoline pre-hydrotreatment - light and heavy fraction gasoline separation - heavy fraction gasoline hydrodesulfurization. After the reaction products are heat-exchanged with the reaction feed, they are cooled by an air cooler and then enter a separation tank for gas-liquid separation. The bottom liquid of the separation tank is heated up through heat exchange and then enters a stabilizing tower to remove hydrogen sulfide and light hydrocarbons, and finally a refined gasoline product meeting the requirements is obtained. In this process flow, most of the reaction heat cannot be fully utilized and is all cooled off by the reaction product air cooler, resulting in energy loss.

[0003] Chinese Patent with Application No. 2014105014570 discloses an energy-saving and consumption-reducing method for a gasoline selective hydrogenation desulfurization device, which uses the heavy fraction hydrogenation product to replace medium-pressure steam as the heat source of the reboiler at the bottom of the stripping column, and uses the heavy fraction hydrogenation product as the heat medium of the heavy gasoline / heavy fraction hydrogenation product heat exchanger b, the hydrogen / heavy fraction hydrogenation product heat exchanger, and the heavy gasoline / heavy fraction hydrogenation product heat exchanger a to heat the heavy gasoline and recycle hydrogen before entering the heating furnace, effectively reducing the heat load of the heating furnace and saving fuel consumption; the temperature of the heavy fraction hydrogenation product after heat exchange drops significantly, and the energy consumption of the heavy fraction hydrogenation product air cooler and the heavy fraction hydrogenation product water cooler is also reduced.

[0004] Chinese Patent with Application No. 2023102901270 discloses an improved tubular heat exchanger, including a heat exchanger main body. Inside the cavity of the heat exchanger main body, a plurality of corresponding strip-shaped heat exchange tubes and U-shaped heat exchange tubes are symmetrically connected through a connecting plate. The above invention solves the problems of replacing the heat exchange tubes and cleaning the inner side walls of the heat exchange tubes by connecting a quick connection component at the connection of the strip-shaped heat exchange tubes and the U-shaped heat exchange tubes.

[0005] Similar to the above-mentioned prior art, in order to save energy, in the gasoline hydrogenation process, the high-temperature reaction product is usually used as a medium to preheat the hydrogenated gasoline. However, due to the high-temperature reaction product, such as the heavy gasoline after the desulfurization reaction, having a relatively large viscosity of its own, and the baffles in the traditional heat exchanger being equally spaced, when the high-temperature reaction product enters the heat exchanger, since the heat exchange has just started, the temperature of the reaction product in the inlet area is relatively high. If the spacing here is too wide, the flow rate will be too slow, resulting in coking of the reaction product in the shell side. As the reaction product flows in the shell side, its temperature continuously decreases, and the viscosity gradually increases, leading to a gradual increase in the flow resistance. When the reaction product flows to the outlet area of the shell side, if the spacing here is too narrow, it will lead to too high a pressure drop and laminar flow phenomenon. The above phenomena are not conducive to the heat exchange of gasoline hydrogenation.

[0006] At the same time, most traditional heat exchangers use fixed baffles. Although it improves the guiding and turbulent flow ability of the flowing medium, it has a large pressure drop and is prone to form dead zones. Due to factors such as the structural design of the U-shaped heat exchanger and the viscosity of the reaction product itself, once a dead zone is formed, it is difficult to clean after shutdown, and the fixed baffles cannot adjust the flow rate of the flowing medium according to its state.

[0007] Therefore, it is necessary to invent a gasoline hydrogenation heat exchange device to solve the above problems. Summary of the Invention

[0008] The purpose of the present invention is to provide a gasoline hydrogenation heat exchange device to solve the problems raised in the above background technology.

[0009] To achieve the above purpose, the present invention provides the following technical solution: A gasoline hydrogenation heat exchange device includes a shell, heat exchange tubes, and through holes. Fixed baffles and movable baffles are arranged at intervals in the shell, and the distances between multiple fixed baffles and movable baffles increase sequentially along the flowing direction of the medium to form a gradient structure. An elastic member whose elasticity changes due to heat is arranged between two adjacent movable baffles. An adjusting assembly that penetrates the heat exchange tubes is arranged on the movable baffle, and the adjusting assembly can adjust the gap between the through hole and the heat exchange tube according to the temperature change.

[0010] Preferably, the through hole is arranged on the movable baffle, and the movable baffle is connected to the heat exchange tube through the through hole, and the adjusting assembly is arranged in the through hole.

[0011] Preferably, the adjusting assembly includes a sliding groove, the sliding groove is opened in the movable baffle and communicated with the through hole, and a connecting member is slidably connected to each sliding groove. The inner diameter of the ring formed when the two connecting members on the same sliding groove are connected end to end is smaller than the diameter of the through hole.

[0012] Preferably, a plurality of limiting grooves are symmetrically formed on each of the sliding grooves, a limiting member is arranged in each of the limiting grooves, one end of the limiting member far away from the limiting groove is fixedly connected to the connecting member, and the limiting member divides the limiting groove into two independent chambers.

[0013] Preferably, media with different coefficients of thermal expansion are respectively filled in the two chambers in the limiting groove, and the coefficient of thermal expansion of the media in the chamber closer to the center of the through hole is greater than that of the media in the chamber far away from the center of the through hole.

[0014] Preferably, a baffle is arranged in the shell body, the baffle divides the shell body into a shell-side chamber and a tube-side chamber, and a partition plate is arranged in the tube-side chamber.

[0015] Preferably, the partition plate divides the tube-side chamber into a tube-side feed zone and a tube-side discharge zone, and all the U-shaped heat exchange tubes are respectively communicated with the tube-side feed zone and the tube-side discharge zone through the baffle.

[0016] Preferably, a hot medium inlet and a hot medium outlet are respectively arranged on the shell-side chamber, a cold medium inlet and a cold medium outlet are respectively arranged in the tube-side chamber, and a shell-side feed zone, a heat exchange zone and a shell-side discharge zone are sequentially arranged in the shell-side chamber along the direction from the inlet to the outlet.

[0017] Preferably, the movable baffle at the end of the hot medium outlet is fixedly connected to the shell body through a fixing member, and a support member is arranged at the bottom of the shell body.

[0018] Preferably, the fixed baffle is fixedly connected to the upper end of the inner cavity of the shell body, the movable baffle is movably connected to the lower end of the inner cavity of the shell body, and the flowing medium entering the shell body from the hot medium inlet flows along a "W"-shaped route under the guidance of the fixed baffle and the movable baffle.

[0019] Technical effects and advantages of the present invention: 1. By sequentially increasing the distances between a plurality of fixed baffles and the movable baffle along the medium flow direction to form a gradient structure, the device of the present invention can adjust the flow rate of heavy gasoline in the early, middle and late stages of heat exchange according to the characteristics of heavy gasoline, thereby avoiding the problems of laminar flow or coking of heavy gasoline during the heat exchange process.

[0020] 2. By arranging an elastic member between two adjacent movable baffles and adjusting the elastic force of the elastic member according to the temperature to drive the movable baffle to move, on the one hand, the turbulence degree of heavy gasoline is adjusted by the frequent movement of the movable baffle, effectively reducing the area of the dead zone. On the other hand, since the movable baffle is slidably connected to the heat exchange tube, the heat exchange tube is cleaned by means of frictional vibration during the sliding process of the movable baffle, avoiding the problem that the scaling on the inner and outer walls of the heat exchange tube affects the heat exchange efficiency.

[0021] 3. By adjusting the mutual cooperation between the adjusting component and devices such as the movable baffle, a gap is formed between the heat exchange tube and the through hole, reducing the friction force between the movable baffle and the heat exchange tube, thereby avoiding problems such as damage to the heat exchange tube caused by excessive friction force or difficulty in moving the movable baffle due to scale formation on the outer surface of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a cross-sectional view of the overall internal structure of the present invention.

[0024] Figure 3 It is a schematic diagram of the connection between the movable baffle and the elastic member of the present invention.

[0025] Figure 4 It is a schematic diagram of the disassembly of a single movable baffle of the present invention.

[0026] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of the mechanism at position A.

[0027] Figure 6 It is a schematic diagram of the structure of the connecting member of the present invention.

[0028] Figure 7 It is a cross-sectional view of the through hole of the movable baffle of the present invention.

[0029] In the figure: 1, housing; 2, fixed baffle; 3, movable baffle; 4, elastic member; 5, heat exchange tube; 6, through hole; 7, adjusting component; 71, sliding groove; 72, connecting member; 73, limiting groove; 74, limiting member; 8, baffle; 9, partition; 10, hot medium inlet; 11, hot medium outlet; 12, cold medium inlet; 13, cold medium outlet; 14, fixing member; 15, supporting member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] To avoid problems such as coking and laminar flow during the heat exchange process between heavy gasoline after desulfurization reaction and hydrogenated oil as the heat exchange medium due to its relatively high viscosity, as Figures 1-7 shown, in the first embodiment of the present invention, a gasoline hydrogenation heat exchange device is provided, including a housing 1 and a heat exchange tube 5. Fixed baffles 2 and movable baffles 3 are arranged at intervals inside the housing 1.

[0032] In this embodiment, the distances between the multiple fixed baffles 2 and the movable baffle 3 increase successively along the medium flow direction to form a gradient structure. Herein, the medium refers to the medium flowing in the shell side, i.e., high-temperature heavy gasoline.

[0033] In this embodiment, a baffle 8 is provided in the shell 1. The baffle 8 divides the shell 1 into a shell side cavity and a tube side cavity. A partition 9 is provided in the tube side cavity. The hydrogenated oil and the heavy gasoline are isolated by the baffle 8. At the same time, to ensure the connection strength of the device and subsequent disassembly and cleaning, the shell 1 can be disassembled at the baffle 8. A sealing ring and a bolt structure are provided on the outer sides of the tube side cavity and the shell side cavity for fixing and sealing.

[0034] In this embodiment, the partition 9 divides the tube side cavity into a tube side feed area and a tube side discharge area. The multiple U-shaped heat exchange tubes 5 are respectively communicated with the tube side feed area and the tube side discharge area through the baffle 8. Through the arrangement of the multiple heat exchange tubes 5, the hydrogenated oil can exchange heat with the heavy gasoline arranged outside the heat exchange tubes 5 through the heat exchange tubes 5, heat the hydrogenated oil by using the waste heat of the heavy gasoline, and at the same time reduce the temperature of the heavy gasoline, which is convenient for subsequent hydrogenation reaction of the hydrogenated oil and air cooling of the heavy gasoline, and further improves the energy utilization rate.

[0035] In this embodiment, a hot medium feed port 10 and a hot medium discharge port 11 are respectively provided on the shell side cavity, a cold medium feed port 12 and a cold medium discharge port 13 are respectively provided in the tube side cavity, and a shell side feed area, a heat exchange area and a shell side discharge area are successively arranged in the shell side cavity along the direction from the feed port to the discharge port.

[0036] In this embodiment, the movable baffle 3 at the end of the hot medium discharge port 11 is fixedly connected to the shell 1 through a fixing member 14, and a support member 15 is provided at the bottom of the shell 1.

[0037] In this embodiment, the fixed baffles 2 are fixedly connected to the upper end of the inner cavity of the shell 1, and the movable baffle 3 is movably connected to the lower end of the inner cavity of the shell 1. The flowing medium entering the shell 1 from the hot medium feed port 10 flows along a "W"-shaped route under the guidance of the fixed baffles 2 and the movable baffle 3.

[0038] During use, first, the feedstock oil is cracked by a cracking device and the solid particles in the feedstock are filtered through a filter, so as to prevent a large amount of solid particles in the subsequent hydrogenated oil from accumulating in the heat exchange tube 5, resulting in the blockage of the heat exchange tube 5. Subsequently, the pressurized feedstock oil is mixed with the fresh hydrogen generated by the aromatics unit through a pressurizing device to form a hydrogenated oil, and the hydrogenated oil is fed into the tube-side feed zone through the cold medium feed port 12. At the same time, the high-temperature heavy gasoline is fed into the shell-side through the hot medium feed port 10. At this time, the low-temperature hydrogenated oil exchanges heat with the heavy gasoline through the heat exchange tube 5 and is discharged from the cold medium discharge port 13, while the high-temperature heavy gasoline is discharged from the hot medium discharge port 11 after heat exchange, completing the heat exchange operation. The waste heat of the high-temperature heavy gasoline is used to heat the hydrogenated oil, and at the same time, the temperature of the heavy gasoline is reduced, which is convenient for subsequent hydrogenation reaction of the hydrogenated oil and air cooling of the heavy gasoline, further improving the energy utilization rate.

[0039] During the heat exchange process between the hydrogenated oil and the heavy gasoline, since a shell-side feed zone, a heat exchange zone and a shell-side discharge zone are sequentially arranged in the shell-side cavity along the direction from the feed port to the discharge port, and the distances between the plurality of fixed baffles 2 and the movable baffles 3 gradually increase in a gradient design, when the heavy gasoline enters the housing 1 through the hot medium feed port 10, at this time, since the heavy gasoline exchanges heat with the hydrogenated oil for the first time, the temperature of the heavy gasoline in the shell-side feed zone is relatively high, and the distance between the fixed baffle 2 and the movable baffle 3 in the shell-side feed zone is relatively narrow. Therefore, when the heavy gasoline passes through the fixed baffle 2 and the movable baffle 3 in this area for baffle flow, due to the relatively high temperature of the heavy gasoline, the fluidity of the heavy gasoline is good, and the distance between the fixed baffle 2 and the movable baffle 3 in this area is the smallest. Thus, by reducing the cross-sectional area of the flow channel, the heavy gasoline is forced to frequently change its flow direction, the flow velocity is increased, and the degree of turbulence is increased. On the one hand, the heat transfer coefficient of the shell-side is improved, and on the other hand, the problem of coking of the high-temperature heavy gasoline in this area is avoided through the high flow velocity.

[0040] It should be noted that the number of the fixed baffles 2 and the movable baffles 3 in each area can be increased or decreased according to actual use requirements, and the width of each area can be adjusted according to actual requirements, and it is not necessarily of equal width. And to ensure the normal heat exchange of the device, pressure pumps can be respectively arranged at the hot medium feed port 10 and the cold medium feed port 12 to ensure the normal heat exchange.

[0041] After heat exchange in the shell-side feed zone, at this time, the temperature of the high-temperature heavy gasoline drops and enters the heat exchange zone. And since the distance between the fixed baffle 2 and the movable baffle 3 in this area is greater than the distance between the fixed baffle 2 and the movable baffle 3 in the shell-side feed zone, compared with the shell-side feed zone, the flow velocity of the heavy gasoline in this area is slower, and the fluid temperature gradient tends to be gentle, taking into account both the heat exchange efficiency and the energy consumption.

[0042] After heat exchange in the heat exchange area, the temperature of the heavy gasoline will be greatly reduced at this time. Due to the decrease in the temperature of the heavy gasoline, the viscosity of the heavy gasoline increases, the flow resistance rises, and the fluidity is poor. Therefore, when the heavy gasoline enters the shell-side discharge area from the heat exchange area, the distance between the fixed baffle 2 and the movable baffle 3 in this area is the largest, so as to increase the distance and reduce the pressure drop, and avoid the problem of laminar flow caused by too low flow velocity due to too high pressure drop.

[0043] However, in actual use, the operator found that although through the setting of the gradual change in distance, it is possible to prevent the heavy gasoline from easily generating coking and laminar flow phenomena during the heat exchange process, the above design will still have dead zones due to the viscosity of the heavy gasoline itself and the degree of turbulence. Once a dead zone is formed, the temperature drops after shutdown, and the cleaning difficulty is relatively high, and the fixed baffle cannot adjust its flow velocity according to the state of the flowing medium.

[0044] Therefore, to solve the above problems, in another embodiment of the present invention, the device further includes an elastic member 4 disposed between two adjacent movable baffles 3. The elastic member 4 can change the elastic force according to the heat change to adjust the distance between the fixed baffle 2 and the movable baffle 3.

[0045] It should be noted that the elastic member 4 is specifically a gas spring structure, and its elastic force is affected by temperature. The higher the temperature, the stronger the elastic force, and the gas filled in the elastic members 4 in each area can be filled with gases with different thermal expansion coefficients according to actual use requirements.

[0046] During use, when the heavy gasoline enters the shell-side feed area, due to the setting of the fixing member 14, the movable baffle 3 at the end of the hot medium discharge port 11 is fixedly connected to the housing 1 and cannot move. The movable baffle 3 here provides a supporting force for the other movable baffles 3. Therefore, when the heavy gasoline contacts the first movable baffle 3 in the shell-side feed area, the movable baffle 3 can move under the setting of the elastic member 4 to relieve the impact force of the heavy gasoline on the movable baffle 3 and avoid the problem of damage to the device caused by too large a force of the heavy gasoline.

[0047] When the heavy gasoline flows in the shell-side feed zone, the temperature in the shell-side feed zone will gradually increase, which enhances the elasticity of the elastic member 4 in this area and drives the movable baffle 3 to move on the heat exchange tube 5, adjusting the distance between the fixed baffle 2 and the movable baffle 3. Since the flow velocity of the heavy gasoline and the pressure on the movable baffle 3 are affected by its own viscosity and the pressure pump, the thrust exerted on the same movable baffle 3 by the heavy gasoline does not remain constant. Therefore, the movable baffle 3 is always in a moving state during the flow of the heavy gasoline. On the one hand, the turbulence degree of the heavy gasoline is adjusted by the frequent movement of the movable baffle 3, effectively reducing the area of the dead zone. On the other hand, since the movable baffle 3 is slidably connected to the heat exchange tube 5, the heat exchange tube 5 is cleaned by means of frictional vibration during the sliding process of the movable baffle 3, avoiding the problem that the fouling on the inner and outer walls of the heat exchange tube 5 affects the heat exchange efficiency.

[0048] However, in actual use, the operator found that when the movable baffle 3 slides on the heat exchange tube 5, if the frictional force is too large, it will instead cause damage to the heat exchange tube 5, and due to the structural setting of the heat exchange tube 5, the replacement and disassembly are difficult.

[0049] To avoid the above problems, in another embodiment of the present invention, the device further includes: a plurality of through holes 6 adapted to the heat exchange tubes 5 are provided in the movable baffle 3, a gap is provided between the through holes 6 and the heat exchange tubes 5, and an adjusting assembly 7 is provided in the through holes 6. The adjusting assembly 7 is used to adjust the gap between the heat exchange tubes 5 and the through holes 6. The adjusting assembly 7 includes a sliding groove 71, the sliding groove 71 is provided in the movable baffle 3 and communicates with the through hole 6, and a connecting member 72 is slidably connected to each sliding groove 71. The inner diameter of the ring formed by connecting the two connecting members 72 at the head and tail on the same sliding groove 71 is smaller than the diameter of the through hole 6.

[0050] In this embodiment, a plurality of limiting grooves 73 are symmetrically provided on each sliding groove 71, a limiting member 74 is provided in each limiting groove 73, one end of the limiting member 74 away from the limiting groove 73 is fixedly connected to the connecting member 72, the limiting member 74 divides the limiting groove 73 into two independent chambers, media with different thermal expansion coefficients are filled in the two chambers in the limiting groove 73, and the thermal expansion coefficient of the medium in the chamber closer to the center of the through hole 6 is greater than the thermal expansion coefficient of the medium in the chamber farther from the center of the through hole 6.

[0051] During use, when the inside of the housing 1 is at normal temperature, the pressure of the medium in the chamber of the limit groove 73 far from the heat exchange tube 5 is slightly greater than the pressure of the medium in the chamber close to the heat exchange tube 5. At this time, the two connecting members 72 in the same through hole 6 are driven by the limiting member 74 to be connected end to end to form a ring, and are attached to the outer wall of the heat exchange tube 5. In this state, the movable baffle 3 is difficult to move. When high-temperature heavy gasoline enters the housing 1, due to the fact that the coefficient of thermal expansion of the medium in the chamber close to the heat exchange tube 5 is greater than that of the medium in the chamber far from the heat exchange tube 5 under the action of temperature, the limiting member 74 can drive the connecting member 72 to move away from the heat exchange tube 5 under the action of pressure, so as to form a gap between the heat exchange tube 5 and the through hole 6. This gap is a tiny gap, which is only used to reduce the friction between the movable baffle 3 and the heat exchange tube 5, thus avoiding the problems of damage to the heat exchange tube 5 caused by excessive friction or difficulty in moving the movable baffle 3 due to scaling on the outer surface of the heat exchange tube 5, and does not affect the normal heat exchange of the heat exchanger.

[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are 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 gasoline hydrogenation heat exchange device, comprising a shell (1), a heat exchange tube (5) and a through hole (6), characterized in that: Fixed deflectors (2) and movable deflectors (3) are arranged in the shell (1) at intervals, and the spacing between the plurality of fixed deflectors (2) and the movable deflectors (3) increases in sequence along the flow direction of the medium to form a gradual structure; An elastic member (4) whose elastic force changes when heated is provided between two adjacent movable deflectors (3), and an adjustment component (7) penetrating the heat exchange tube (5) is provided on the movable deflector (3). The adjustment component (7) can adjust the gap between the through hole (6) and the heat exchange tube (5) as the temperature changes.

2. The gasoline hydrogenation heat exchange device according to claim 1, characterized in that: The through hole (6) is arranged on the movable deflector (3), and the movable deflector (3) is connected to the heat exchange tube (5) through the through hole (6), and the regulating component (7) is arranged in the through hole (6).

3. The gasoline hydrogenation heat exchange device according to claim 2, characterized in that: The adjustment assembly (7) comprises a sliding groove (71), wherein the sliding groove (71) is provided in the movable deflector (3) and communicates with the through hole (6), and a connecting piece (72) is slidably connected to each sliding groove (71), and when two connecting pieces (72) located on the same sliding groove (71) are connected end to end, the inner diameter of the circular ring formed is smaller than the diameter of the through hole (6).

4. The gasoline hydrogenation heat exchange device according to claim 3, characterized in that: A plurality of limiting grooves (73) are symmetrically formed on each of the sliding grooves (71), and a limiting member (74) is provided in each of the limiting grooves (73). One end of the limiting member (74) away from the limiting groove (73) is fixedly connected to the connecting member (72), and the limiting member (74) divides the limiting groove (73) into two independent chambers.

5. The gasoline hydrogenation heat exchange device according to claim 4, characterized in that: The two chambers in the limiting groove (73) are respectively filled with media with different thermal expansion coefficients, and the thermal expansion coefficient of the medium in the chamber close to the center of the through hole (6) is greater than the thermal expansion coefficient of the medium in the chamber far from the center of the through hole (6).

6. The gasoline hydrogenation heat exchange device according to claim 5, characterized in that: A baffle (8) is provided in the shell (1), and the baffle (8) divides the shell (1) into a shell-side cavity and a tube-side cavity. A partition (9) is provided in the tube-side cavity.

7. The gasoline hydrogenation heat exchange device according to claim 6, characterized in that: The partition (9) divides the tube-side cavity into a tube-side feed area and a tube-side discharge area, and the plurality of U-shaped heat exchange tubes (5) are respectively connected to the tube-side feed area and the tube-side discharge area through the baffle (8).

8. The gasoline hydrogenation heat exchange device according to claim 7, characterized in that: The shell side cavity is provided with a heat medium feed port (10) and a heat medium discharge port (11), respectively; the tube side cavity is provided with a cold medium feed port (12) and a cold medium discharge port (13), respectively; and the shell side cavity is provided with a shell side feed area, a heat exchange area and a shell side discharge area in sequence from the feed port to the discharge port.

9. The gasoline hydrogenation heat exchange device according to claim 8, characterized in that: The movable deflector (3) located at the end of the heat medium discharge port (11) is fixedly connected to the shell (1) via a fixing member (14), and a supporting member (15) is provided at the bottom of the shell (1).

10. The gasoline hydrogenation heat exchange device according to claim 9, characterized in that: The fixed deflector (2) is fixedly connected to the upper end of the inner cavity of the shell (1), and the movable deflector (3) is movably connected to the lower end of the inner cavity of the shell (1). The flow medium entering the shell (1) from the heat medium feed port (10) flows in a "W"-shaped route under the guidance of the fixed deflector (2) and the movable deflector (3).

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