High-efficiency heat exchange unit for chemical production

Abstract

The present application relates to heat exchange technical field, specifically to a kind of high-efficiency heat exchange unit for chemical production, including shell, heat exchange pipe and turbulence unit;Heat exchange pipe is set in shell;Turbulence unit includes the first baffle and second baffle that spirals around heat exchange pipe axis, and the rotational direction of two is opposite, and is all along heat exchange pipe axial sliding installation in heat exchange chamber;The inner ring of first baffle and the outer ring of second baffle are all conical cylinder surface.The inner ring of first baffle and the outer ring of second baffle are staggered when first baffle and second baffle are mutually far away and open gap along heat exchange pipe axis, and the flow rate of heat exchange medium in heat exchange chamber increases;And the gap that first baffle and second baffle are pulled apart in its axial direction is negatively related with the temperature difference size of heat exchange medium and fluid in heat exchange pipe.Utilize the flow rate of heat exchange medium to be adjusted by first baffle and second baffle in the movement of heat exchange pipe axis, and heat energy utilization rate and heat exchange efficiency are considered.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and more specifically to a high-efficiency heat exchange unit for chemical production. Background Technology

[0002] In chemical production processes, numerous reaction, separation, and concentration steps involve significant exothermic or endothermic effects, generating large quantities of process fluids with residual heat (such as high-temperature wastewater, waste liquid, or process gas). To achieve cascaded energy utilization, reduce production energy consumption, and meet the specific temperature requirements of subsequent processes, heat exchangers have become indispensable key equipment in chemical plants. Their performance directly affects the energy efficiency, operational stability, and operating costs of the entire production system.

[0003] Traditional shell-and-tube heat exchangers are most commonly used in the chemical industry due to their robust structure, high pressure resistance, and wide applicable temperature range. Their typical structure consists of multiple heat exchange tubes arranged within a cylindrical shell. One fluid flows inside the tubes (tube side), while another fluid flows both inside the shell and outside the tubes (shell side), exchanging heat through the tube walls. To enhance heat transfer in the shell side, a series of baffles are typically installed inside the shell. Their core function is to guide the shell-side fluid to change direction, increase turbulence, reduce the thickness of the heat transfer boundary layer, and support the heat exchange tubes to prevent vibration.

[0004] However, while the bow-shaped baffles or disk-annular baffles widely used in existing technologies enhance heat transfer to some extent, they also have some inherent drawbacks. The geometry and arrangement of traditional baffles are usually fixed, designed based on specific operating conditions (such as fixed flow rates and inlet / outlet temperatures). When the temperature of the hot fluid entering the heat exchanger fluctuates, causing the temperature difference between it and the cold fluid to deviate from the design value, the fixed-structure baffles cannot adaptively adjust. For example, when the inlet temperature of the hot fluid is significantly higher than the design value (i.e., the heat exchange temperature difference increases), at a fixed flow rate, the hot fluid may release too much heat prematurely and cool too quickly, failing to fully utilize its high-grade thermal energy, resulting in a waste of "thermal energy grade." Conversely, when the hot fluid temperature is lower (i.e., the heat exchange temperature difference decreases), if the original flow rate and flow field are maintained, the heat transfer driving force is insufficient, and the hot fluid may remain ineffectively in the shell side for a long time, resulting in low heat transfer per unit time and a decrease in overall heat transfer efficiency.

[0005] Therefore, existing heat exchangers with fixed baffle structures cannot maintain high efficiency under a wide range of operating conditions and lack the "intelligence" to self-adjust according to actual heat exchange needs (especially temperature difference changes). This restricts their full potential in modern chemical processes that pursue refined and energy-saving production. Summary of the Invention

[0006] This invention provides a high-efficiency heat exchange unit for chemical production, which solves the problem that the baffle structure of existing heat exchangers is simple and cannot be adjusted automatically, thus affecting the heat exchange efficiency.

[0007] The present invention provides a high-efficiency heat exchange unit for chemical production, which adopts the following technical solution:

[0008] A high-efficiency heat exchange unit for chemical production includes a shell, heat exchange tubes, and a turbulence-inducing unit. The heat exchange tubes are disposed within the shell, and a heat exchange chamber, isolated from the interior of the heat exchange tubes, is reserved within the shell for introducing a heat exchange medium. The turbulence-inducing unit includes a first baffle and a second baffle, both of which are spiral plates oriented around the axial direction of the heat exchange tubes, with opposite directions of rotation, and both are slidably installed in the heat exchange chamber along the axial direction of the heat exchange tubes. The inner ring of the first baffle and the outer ring of the second baffle are both conical cylindrical surfaces. The turbulence-inducing unit has a converging state and a dispersing state. In the converging state, the first baffle… The plate is located outside the second baffle, and the inner ring of the first baffle and the outer ring of the second baffle are coplanar. In the dispersed state, the first baffle and the second baffle are separated from each other along the axial direction of the heat exchange tube, so that the inner ring of the first baffle and the outer ring of the second baffle are staggered, and the flow velocity of the heat exchange medium in the heat exchange chamber increases. The turbulence unit switches to the convergence state when the temperature difference between the heat exchange medium and the fluid in the heat exchange tube is greater than a preset range, and switches to the dispersed state when the temperature difference is less than the preset range. In the dispersed state, the gap between the first baffle and the second baffle in their axial direction is negatively correlated with the magnitude of the temperature difference.

[0009] Optionally, the heat exchange tube is a variable diameter tube with expansion points and contraction points that are alternately distributed along its axial direction. The diameter at the expansion point is larger than the diameter at the contraction point, and the diameter of the heat exchange tube changes uniformly from the expansion point to the contraction point or from the contraction point to the expansion point.

[0010] Optionally, there are multiple heat exchange tubes, all arranged in parallel and distributed in a circumferential matrix within the shell; and the expansion or contraction points of different heat exchange tubes are spirally distributed in the circumferential direction; multiple heat exchange tubes of different or adjacent circumferences sequentially pass through the first baffle and the second baffle; in the convergent state, both the first baffle and the second baffle pass through the contraction point of the heat exchange tube; during the transition from the turbulent state to the dispersed state, both the first baffle and the second baffle move away from the contraction point of the heat exchange tube; the moving distance of the first baffle and the second baffle does not exceed the distance between adjacent contraction and expansion points of the heat exchange tube.

[0011] Optionally, damping rings are provided at the intersections of the first and second baffles and the heat exchange tubes. The damping rings are sleeved on the outside of the heat exchange tubes to absorb vibration and reduce shock.

[0012] Optionally, the damping ring includes an outer ring, an inner ring, and multiple partition plate assemblies; the outer ring is fixed to a first baffle or a second baffle; the inner ring is made of flexible material and is fixed to the inner ring of the outer ring, defining a sealed buffer chamber between them; the multiple partition plate assemblies are spaced apart around the inner ring to divide the buffer chamber into multiple damping cavities around the inner ring; the partition plate assemblies are provided with damping holes that connect two adjacent damping cavities, and the size of the damping holes is negatively correlated with the size of the inner ring.

[0013] Optionally, the partition plate assembly includes a first plate fixed to the outer ring and a second plate fixed to the inner ring, with the first plate and the second plate in contact; a damping hole is formed on the first plate, and the second plate moves to block the damping hole on the first plate when the inner ring expands, and the greater the expansion of the inner ring, the more the second plate moves to block the damping hole on the first plate.

[0014] Optionally, a first sliding ring is connected to each end of the first baffle plate, and the first sliding ring is slidably installed in the shell along the heat exchange tube axis; a central rod parallel to the heat exchange tube is fixed to the inner ring of the second baffle plate, and a second sliding ring is connected to one end of the central rod; the high-efficiency heat exchange unit for chemical production also includes a power mechanism, which drives the first sliding ring and the second sliding ring to move, thereby causing the first baffle plate and the second baffle plate to move.

[0015] Optionally, the power mechanism includes a motor and a double-ended screw. The double-ended screw is rotatably mounted inside the housing and parallel to the heat exchange tube. The second sliding ring and one of the first sliding rings respectively engage with the threaded portions of the double-ended screw with different directions of rotation. The motor drives the double-ended screw to rotate, causing the first sliding ring and the second sliding ring to move in opposite directions.

[0016] Optionally, the shell has an inlet chamber and an outlet chamber at both ends of the heat exchange tube along the axial direction. Both the inlet chamber and the outlet chamber are connected to the inside of the heat exchange tube and isolated from the heat exchange chamber.

[0017] Optionally, the shell is provided with an inlet and an outlet that communicate with the heat exchange chamber, and the inlet and outlet are located at the two ends of the heat exchange tube, respectively.

[0018] The beneficial effects of this invention are as follows: The high-efficiency heat exchange unit for chemical production of this invention uses first and second baffles with opposite directions of rotation to provide resistance to the flow of the heat exchange medium, generating turbulence and extending the residence time of the heat exchange medium in the heat exchange chamber, ensuring sufficient contact between it and the heat exchange tubes. Furthermore, the movement of the first and second baffles along the axial direction of the heat exchange tubes adjusts the flow velocity of the heat exchange medium, balancing thermal energy utilization and heat exchange efficiency, reflecting the refinement and energy saving of chemical production. If the temperature of the heat exchange medium is high, the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube is large. In this case, by making the turbulence units tend to converge, the flow velocity of the heat exchange medium is reduced, ensuring sufficient contact between the heat exchange medium and the heat exchange tubes, extending the heat exchange time, and improving the thermal energy utilization rate of the heat exchange medium. If the temperature of the heat exchange medium is low, the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube is small. In this case, by making the turbulence units disperse, the flow velocity of the heat exchange medium is increased, reducing the ineffective residence time of the heat exchange medium in the heat exchange chamber, and improving the heat exchange efficiency.

[0019] Furthermore, the variable diameter design of the heat exchange tubes allows the fluid inside the tubes to alternately pass through the expansion and contraction points during flow. The constantly changing flow diameter of the fluid can disrupt the thermal boundary layer of the fluid, enabling the fluid inside the heat exchange tubes to exchange in the radial direction, thereby further improving the heat exchange efficiency of the fluid.

[0020] Furthermore, when the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube is small, the first or second baffle moves from the contraction point to the expansion point of the heat exchange tube, increasing the flow velocity of the heat exchange medium in the heat exchange chamber, which can easily cause vibration of the heat exchange tube. During this process, the inner ring is expanded by the heat exchange tube, and the expansion of the inner ring compresses the damping cavity. At the same time, the damping orifice decreases, increasing the flow resistance of the damping fluid in the damping cavity and improving the damping capacity of the damping ring. Conversely, when the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube is large, the first and second baffles move from the expansion point to the contraction point of the heat exchange tube, decreasing the flow velocity of the heat exchange medium in the heat exchange chamber, which is less likely to cause vibration of the heat exchange tube. During this process, the inner ring returns to contraction, no longer compressing the damping cavity and the heat exchange tube, leaving space for the thermal expansion of the heat exchange tube. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention;

[0023] Figure 2 This is a top view of the overall structure of an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention;

[0024] Figure 3 for Figure 2 Schematic diagram of cross section along the AA direction;

[0025] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0026] Figure 5 This is a schematic diagram of the internal structure of the shell in an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention;

[0027] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0028] Figure 7 This is a schematic diagram showing the overall structure of an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention.

[0029] Figure 8 This is a schematic diagram of the damping ring structure in an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention;

[0030] Figure 9 for Figure 8 Schematic diagram of cross section in the DD direction;

[0031] Figure 10 This is a cross-sectional schematic diagram of the damping ring in an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of the turbulence unit in the converged state in an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention;

[0033] Figure 12 This is a schematic diagram of the structure of the turbulence unit in a dispersed state in an embodiment of a high-efficiency heat exchange unit for chemical production according to the present invention.

[0034] In the diagram: 100, shell; 110, liquid inlet chamber; 120, liquid outlet chamber; 130, liquid inlet; 140, liquid outlet; 150, guide rod; 160, partition plate; 200, heat exchange tube; 300, first baffle plate; 310, first sliding ring; 400, second baffle plate; 410, center rod; 420, second sliding ring; 500, damping ring; 510, outer ring; 520, inner ring; 530, partition plate assembly; 531, first plate; 532, second plate; 533, damping hole; 534, damping cavity; 600, power mechanism; 610, motor; 620, double-ended screw. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] An embodiment of the present invention for a high-efficiency heat exchange unit used in chemical production, such as... Figures 1 to 12 As shown, it includes a housing 100, a heat exchange tube 200, and a turbulence unit.

[0037] The heat exchange tube 200 is disposed inside the shell 100, and a heat exchange chamber is reserved inside the shell 100 to isolate the heat exchange tube 200 from the inside. The heat exchange chamber is used to introduce the heat exchange medium. The heat exchange medium flows from one end of the heat exchange tube 200 to the other end outside the heat exchange tube 200 and is discharged, transferring heat to the fluid inside the heat exchange tube 200.

[0038] The turbulence unit includes a first baffle plate 300 and a second baffle plate 400. Both the first baffle plate 300 and the second baffle plate 400 are spiral plates extending axially around the heat exchange tube 200, and their rotation directions are opposite. Both are slidably installed in the heat exchange chamber along the axial direction of the heat exchange tube 200. The inner ring of the first baffle plate 300 and the outer ring of the second baffle plate 400 are both conical cylindrical surfaces.

[0039] The turbulence unit has a convergence state and a dispersion state. In the convergence state, the first baffle 300 is located outside the second baffle 400, and the inner ring of the first baffle 300 and the outer ring of the second baffle 400 are coplanar. In the dispersion state, the first baffle 300 and the second baffle 400 are separated from each other along the axial direction of the heat exchange tube 200, so that the inner ring of the first baffle 300 and the outer ring of the second baffle 400 are staggered, and the flow velocity of the heat exchange medium in the heat exchange chamber increases. The turbulence unit switches to the convergence state when the temperature difference between the heat exchange medium and the fluid in the heat exchange tube 200 is greater than a preset range, and switches to the dispersion state when the temperature difference is less than the preset range. In the dispersion state, the gap between the first baffle 300 and the second baffle 400 in their axial direction is negatively correlated with the magnitude of the temperature difference.

[0040] In use, the heat exchange tube 200 is usually filled with room temperature water or other fluids used to absorb heat energy. The heat exchange medium in the heat exchange chamber is usually wastewater or waste liquid with high temperature after chemical production. By allowing the heat exchange medium to flow outside the heat exchange tube 200, heat is transferred to the fluid inside the heat exchange tube 200, and the heat energy of the heat exchange medium is recovered.

[0041] Because the first baffle 300 and the second baffle 400 rotate in opposite directions, they act as opposing guides when the heat exchange medium flows within the heat exchange chamber, hindering its flow and creating turbulence. This prolongs the residence time of the heat exchange medium in the heat exchange chamber, ensuring sufficient contact between the medium and the heat exchange tube 200. In the convergent state, the conical surfaces of the inner ring of the first baffle 300 and the outer ring of the second baffle 400 are coplanar, maximizing the obstruction effect of the first baffle 300 and the second baffle 400 on the heat exchange medium, resulting in the slowest flow velocity of the heat exchange medium within the heat exchange chamber. In the dispersed state, the first baffle 300 and the second baffle 400 are separated in the axial direction of the heat exchange tube 200, and their conical surfaces no longer overlap. The heat exchange medium can pass through the gap in the radial direction, thus reducing the obstruction effect of the baffle on the heat exchange medium and increasing the flow velocity of the heat exchange medium in the heat exchange chamber. Furthermore, in the dispersed state, the larger the gap between the first baffle 300 and the second baffle 400, the weaker the obstruction effect on the heat exchange medium, and the greater the flow velocity of the heat exchange medium in the heat exchange chamber.

[0042] If the temperature of the heat exchange medium is high, the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200 is large. In this case, by making the turbulence units tend to converge, the flow velocity of the heat exchange medium is reduced, allowing the heat exchange medium to fully contact the heat exchange tube 200, prolonging the heat exchange time, and improving the thermal energy utilization rate of the heat exchange medium. If the temperature of the heat exchange medium is low, the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200 is small. In this case, by making the turbulence units disperse, the flow velocity of the heat exchange medium is increased, reducing the ineffective residence time of the heat exchange medium in the heat exchange chamber, and improving the heat exchange efficiency. The temperature change of the heat exchange medium can be monitored by a temperature sensor and fed back to the control module. The control module adjusts the axial gap between the first baffle 300 and the second baffle 400 according to the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200. This control module can be implemented by a PLC program in the prior art, and its specific principle will not be elaborated.

[0043] In this embodiment, the heat exchange tube 200 is a variable diameter tube with dilation and contraction points that are alternately distributed along its axial direction. The diameter at the dilation point is larger than the diameter at the contraction point, and the diameter of the heat exchange tube 200 changes uniformly from the dilation point to the contraction point or from the contraction point to the dilation point. This variable diameter design of the heat exchange tube 200 allows the fluid inside to flow through the dilation and contraction points alternately, resulting in a continuously changing flow diameter. This disrupts the thermal boundary layer of the fluid, enabling radial exchange of heat within the heat exchange tube 200 and further improving the heat exchange efficiency.

[0044] In this embodiment, there are multiple heat exchange tubes 200, all arranged in parallel and distributed in a circumferential matrix within the shell 100. The expansion and contraction points of different heat exchange tubes 200 are spirally distributed along the circumference. Multiple heat exchange tubes 200 from different or adjacent circumferences sequentially pass through the first baffle 300 and the second baffle 400. In the convergent state, both the first baffle 300 and the second baffle 400 pass through the contraction points of the heat exchange tubes 200. During the transition from the convergent to the dispersed state, both the first baffle 300 and the second baffle 400 move away from the contraction points of the heat exchange tubes 200; the moving distance of the first baffle 300 and the second baffle 400 does not exceed the distance between adjacent contraction and expansion points of the heat exchange tubes 200. Specifically, the first baffle 300 and the second baffle 400 constantly move back and forth between the adjacent contraction and expansion points of the heat exchange tube 200. When the temperature difference is large, the turbulence unit tends to converge, and both the first baffle 300 and the second baffle 400 move closer to the contraction point of the heat exchange tube 200, providing expansion space for the penetration position of the heat exchange tube 200 and the first baffle 300 and the second baffle 400.

[0045] In this embodiment, damping rings 500 are provided at the intersections of the first baffle 300 and the second baffle 400 with the heat exchange tube 200. The damping rings 500 are sleeved around the heat exchange tube 200 to absorb vibration and reduce shock. During the flow of the heat exchange medium in the heat exchange chamber, it will impact the heat exchange tube 200, causing it to vibrate. By providing damping rings 500 between the first baffle 300 and the second baffle 400 and the heat exchange tube 200, the friction and wear on the heat exchange tube 200 can be reduced, and the vibration of the heat exchange tube 200 can also be buffered.

[0046] In this embodiment, the damping ring 500 includes an outer ring 510, an inner ring 520, and multiple partition plate groups 530. The outer ring 510 is fixed to the first baffle plate 300 or the second baffle plate 400. The inner ring 520 is made of flexible material and is fixed to the inner ring of the outer ring 510, defining a sealed buffer chamber between them. Specifically, the inner ring 520 can be a rubber ring or silicone material. Multiple partition plate groups 530 are spaced apart circumferentially around the inner ring 520 to divide the buffer chamber into multiple damping cavities 534 circumferentially around the inner ring 520. Each damping cavity 534 is filled with damping fluid. The partition plate groups 530 have damping holes 533 that connect two adjacent damping cavities 534. The size of the damping holes 533 is negatively correlated with the size of the inner ring 520. The flexible inner ring 520 can adapt to different diameters of the heat exchange tube 200. When the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200 is small, the first baffle 300 or the second baffle 400 moves from the contraction point to the expansion point of the heat exchange tube 200, increasing the flow velocity of the heat exchange medium in the heat exchange chamber, which can easily cause vibration of the heat exchange tube 200. During this process, the inner ring 520 is expanded by the heat exchange tube 200, and the expansion of the inner ring 520 compresses the damping cavity 534. At the same time, the damping orifice 533 decreases, increasing the flow resistance of the damping fluid in the damping cavity 534 and improving the damping capacity of the damping ring 500. Conversely, when the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200 is large, the first baffle 300 and the second baffle 400 move from the expansion point to the contraction point of the heat exchange tube 200, reducing the flow velocity of the heat exchange medium in the heat exchange chamber and making it less likely to cause vibration of the heat exchange tube 200. During this process, the inner ring 520 resumes contraction and no longer squeezes the damping cavity 534 and the heat exchange tube 200, leaving space for the heat exchange tube 200 to expand due to heat.

[0047] In this embodiment, the partition plate assembly 530 includes a first plate 531 fixed to the outer ring 510 and a second plate 532 fixed to the inner ring 520, with the first plate 531 and the second plate 532 in contact. A damping hole 533 is formed on the first plate 531. When the inner ring 520 expands, the second plate 532 moves to block the damping hole 533 on the first plate 531. The greater the expansion of the inner ring 520, the more the second plate 532 blocks the damping hole 533 on the first plate 531. In some other embodiments, the damping hole 533 may also be formed on the second plate 532, with the first plate 531 blocking the damping hole 533 on the second plate 532.

[0048] In this embodiment, a first sliding ring 310 is connected to each end of the first baffle 300. The first sliding ring 310 is slidably installed within the housing 100 along the axial direction of the heat exchange tube 200. A central rod 410 parallel to the heat exchange tube 200 is fixed to the inner ring of the second baffle 400, and a second sliding ring 420 is connected to one end of the central rod 410. The high-efficiency heat exchange unit for chemical production also includes a power mechanism 600, which drives the first sliding ring 310 and the second sliding ring 420 to move, thereby causing the first baffle 300 and the second baffle 400 to move. A guide rod 150 parallel to the heat exchange tube 200 is fixed inside the housing 100, and both the first sliding ring 310 and the second sliding ring 420 are slidably installed on the guide rod 150.

[0049] In this embodiment, the power mechanism 600 includes a motor 610 and a double-ended screw 620. The double-ended screw 620 is rotatably mounted inside the housing 100 and parallel to the heat exchange tube 200. A second sliding ring 420 and one of the first sliding rings 310 respectively engage with threaded portions of the double-ended screw 620 in different directions. The motor 610 drives the double-ended screw 620 to rotate, causing the first sliding ring 310 and the second sliding ring 420 to move in opposite directions. Forward rotation of the double-ended screw 620 by the motor 610 brings the first baffle 300 and the second baffle 400 closer together; reverse rotation of the double-ended screw 620 by the motor 610 moves the first baffle 300 and the second baffle 400 further apart. The rotation direction and time of the motor 610 can be controlled by a control module to match the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200. Specifically, the output shaft of the motor 610 can be directly connected to the double-ended screw 620 for transmission. In some other embodiments, to avoid interference between the motor 610 and the housing 100, the motor 610 is fixed outside the housing 100, and the output shaft of the motor 610 is perpendicular to the double-ended screw 620. The output shaft of the motor 610 and the double-ended screw 620 are connected and driven by a set of bevel gears.

[0050] In this embodiment, the housing 100 has an inlet chamber 110 and an outlet chamber 120 at both ends of the heat exchange tube 200 along the axial direction. Both the inlet chamber 110 and the outlet chamber 120 are connected to the interior of the heat exchange tube 200 and isolated from the heat exchange chamber. Specifically, the inlet chamber 110 and the outlet chamber 120 are connected to the heat exchange chamber through a partition 160 fixed inside the housing 100. The interior of the heat exchange tube 200 passes through the partition 160 and is connected to the inlet chamber 110 and the outlet chamber 120.

[0051] In this embodiment, the housing 100 is provided with an inlet 130 and an outlet 140 that communicate with the heat exchange chamber. The inlet 130 and the outlet 140 are located at the two ends of the heat exchange tube 200, respectively.

[0052] In operation, the high-efficiency heat exchange unit for chemical production of this invention has its casing 100 placed horizontally. The fluid to be heated is introduced into the heat exchange tube 200 through the inlet chamber 110, and the heat exchange medium is introduced into the heat exchange chamber through the inlet 130. An external pump source provides pressure to the flow of the heat exchange medium within the heat exchange chamber, enabling it to overcome the resistance of the first baffle 300 and the second baffle 400 before being discharged from the outlet 140. By allowing the heat exchange medium to flow outside the heat exchange tube 200, heat is transferred to the fluid inside the tube, thus recovering the thermal energy of the heat exchange medium.

[0053] If the temperature of the heat exchange medium is high, the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200 will be large. In this case, by driving the double-headed screw 620 to rotate forward, the first baffle 300 and the second baffle 400 will move closer to each other, and the turbulence unit will tend to converge, thereby reducing the flow velocity of the heat exchange medium, allowing the heat exchange medium to fully contact the heat exchange tube 200, prolonging the heat exchange time, and improving the thermal energy utilization rate of the heat exchange medium. During this process, the first baffle 300 and the second baffle 400 move from the expansion point to the contraction point of the heat exchange tube 200, reducing the flow velocity of the heat exchange medium in the heat exchange chamber and making it less likely to cause vibration of the heat exchange tube 200; at the same time, the inner ring 520 resumes contraction, no longer squeezing the damping cavity 534 and the heat exchange tube 200, leaving space for the thermal expansion of the heat exchange tube 200.

[0054] If the temperature of the heat exchange medium is low, the temperature difference between the heat exchange medium and the fluid inside the heat exchange tube 200 is small. In this case, by reversing the double-headed screw 620 driven by the motor 610, the first baffle 300 and the second baffle 400 are moved away from each other, and the turbulence unit is in a dispersed state, thereby increasing the flow velocity of the heat exchange medium, reducing the ineffective residence time of the heat exchange medium in the heat exchange chamber, and improving the heat exchange efficiency. During this process, the first baffle 300 or the second baffle 400 moves from the contraction point to the expansion point of the heat exchange tube 200, increasing the flow velocity of the heat exchange medium in the heat exchange chamber, which can easily cause vibration of the heat exchange tube 200. Meanwhile, when the damping ring 500 moves, the inner ring 520 is expanded by the heat exchange tube 200, and the expansion of the inner ring 520 compresses the damping cavity 534. At the same time, the damping orifice 533 decreases, increasing the flow resistance of the damping fluid in the damping cavity 534 and improving the damping capacity of the damping ring 500.

[0055] Temperature changes in the heat exchange medium can be monitored by a temperature sensor and fed back to the control module. The control module controls the rotation direction and rotation time of the motor 610 based on the temperature difference between the heat exchange medium and the fluid in the heat exchange tube 200, thereby adjusting the axial gap between the first baffle 300 and the second baffle 400.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency heat exchange unit for chemical production, characterized in that: Includes the shell, heat exchange tubes, and turbulence unit; The heat exchange tubes are installed inside the shell, and a heat exchange chamber is reserved inside the shell to isolate the heat exchange tubes. The heat exchange chamber is used to introduce the heat exchange medium. The turbulence unit includes a first baffle and a second baffle. Both the first baffle and the second baffle are spiral plates around the heat exchange tube axis, and their spiral directions are opposite. Both are slidably installed in the heat exchange chamber along the heat exchange tube axis. The inner ring of the first baffle and the outer ring of the second baffle are both conical cylindrical surfaces. The turbulence unit has a convergence state and a dispersion state. In the convergence state, the first baffle is located outside the second baffle, and the inner ring of the first baffle and the outer ring of the second baffle are coplanar. In the dispersion state, the first baffle and the second baffle are separated from each other along the axial direction of the heat exchange tube, so that the inner ring of the first baffle and the outer ring of the second baffle are staggered, and the flow velocity of the heat exchange medium in the heat exchange chamber increases. The turbulence unit switches to the convergence state when the temperature difference between the heat exchange medium and the fluid in the heat exchange tube is greater than a preset range, and switches to the dispersion state when the temperature difference is less than the preset range. In the dispersion state, the gap between the first baffle and the second baffle along their axial direction is negatively correlated with the magnitude of the temperature difference. The heat exchange tube is a variable diameter tube with expansion points and contraction points that are alternately distributed along its axial direction. The diameter at the expansion point is larger than the diameter at the contraction point, and the diameter of the heat exchange tube changes uniformly from the expansion point to the contraction point or from the contraction point to the expansion point. There are multiple heat exchange tubes, all arranged in parallel and distributed in a circumferential matrix within the shell; the expansion or contraction points of different heat exchange tubes are spirally distributed in the circumferential direction; multiple heat exchange tubes of different or adjacent circumferences sequentially pass through the first baffle and the second baffle; when the turbulence unit is in a converging state, both the first baffle and the second baffle pass through the contraction points of the heat exchange tubes; during the process of the turbulence unit switching to a dispersed state, both the first baffle and the second baffle move away from the contraction points of the heat exchange tubes; the moving distance of the first baffle and the second baffle does not exceed the distance between adjacent contraction and expansion points of the heat exchange tubes.

2. The high-efficiency heat exchange unit for chemical production according to claim 1, characterized in that: Damping rings are provided at the intersections of the first and second baffles and the heat exchange tubes. The damping rings are sleeved on the outside of the heat exchange tubes and are used to absorb vibration and reduce shock in the heat exchange tubes.

3. The high-efficiency heat exchange unit for chemical production according to claim 2, characterized in that: The damping ring includes an outer ring, an inner ring, and multiple partition plate assemblies; the outer ring is fixed to a first baffle or a second baffle; the inner ring is made of flexible material and is fixed to the inner ring of the outer ring, defining a sealed buffer chamber between them; multiple partition plate assemblies are spaced apart around the inner ring to divide the buffer chamber into multiple damping cavities around the inner ring; the partition plate assemblies are provided with damping holes that connect two adjacent damping cavities, and the size of the damping holes is negatively correlated with the size of the inner ring.

4. The high-efficiency heat exchange unit for chemical production according to claim 3, characterized in that: The partition plate assembly includes a first plate fixed to the outer ring and a second plate fixed to the inner ring, with the first plate and the second plate in contact. A damping hole is formed on the first plate, and the second plate moves to block the damping hole on the first plate when the inner ring expands. The greater the expansion of the inner ring, the more the second plate blocks the damping hole on the first plate.

5. The high-efficiency heat exchange unit for chemical production according to claim 1, characterized in that: The first baffle plate has a first sliding ring connected to each end, and the first sliding ring is slidably installed in the shell along the heat exchange tube axis; the inner ring of the second baffle plate has a central rod parallel to the heat exchange tube, and one end of the central rod is connected to the second sliding ring; the high-efficiency heat exchange unit for chemical production also includes a power mechanism, which drives the first sliding ring and the second sliding ring to move, thereby causing the first baffle plate and the second baffle plate to move.

6. The high-efficiency heat exchange unit for chemical production according to claim 5, characterized in that: The power mechanism includes a motor and a double-ended screw. The double-ended screw is rotatably installed inside the housing and parallel to the heat exchange tube. The second sliding ring and one of the first sliding rings respectively engage with the threaded portions of the double-ended screw with different directions of rotation. The motor drives the double-ended screw to rotate, causing the first sliding ring and the second sliding ring to move in opposite directions.

7. The high-efficiency heat exchange unit for chemical production according to claim 1, characterized in that: The shell has an inlet chamber and an outlet chamber at both ends of the heat exchange tube along the axial direction. Both the inlet chamber and the outlet chamber are connected to the inside of the heat exchange tube and isolated from the heat exchange chamber.

8. The high-efficiency heat exchange unit for chemical production according to claim 1, characterized in that: The shell has an inlet and an outlet that communicate with the heat exchange chamber, and the inlet and outlet are located at the two ends of the heat exchange tube, respectively.

Images