Energy-saving tubular heat exchanger for biological fuel oil processing

Abstract

The invention discloses an energy-saving tubular heat exchanger for biological fuel oil processing, and relates to the technical field of energy-saving heat exchangers, the energy-saving tubular heat exchanger comprises a shell, the shell comprises two tube plates fixedly mounted in the shell, a plurality of tube nests fixedly mounted on the two tube plates and a plurality of baffle plates arranged between the two tube plates, the plurality of baffle plates are sequentially distributed in a staggered manner in the length direction of the shell, and the plurality of baffle plates are slidably connected to the exteriors of the tube nests in a sleeving manner; the distance adjusting mechanism is mounted in the shell and used for adjusting the distance between every two adjacent baffle plates; the in-pipe adjusting mechanism is mounted in the shell and is used for intermittently adjusting the flow velocity of the biofuel oil in the tube nest; according to the energy-saving type tubular heat exchanger for biofuel oil processing, by intermittently adjusting the distance between the baffle plates, the turbulence degree of washing the tube nests can be fully enhanced for different areas, a thermal boundary layer is damaged, the heat transfer coefficient is remarkably increased, and dirt formation is delayed.

Description

Technical Field

[0001] This invention relates to the field of energy-saving heat exchanger technology, and specifically to an energy-saving tubular heat exchanger for biofuel processing. Background Technology

[0002] Heat exchangers are used in the biofuel processing process. They are the core equipment in the entire production plant to achieve precise temperature control, efficient energy recovery, and ensure reaction safety.

[0003] In existing tubular heat exchangers, the baffles are generally fixed, and the spacing between the baffles is difficult to adjust. This fixed spacing design can easily lead to "flow dead zones" or "short-circuit flow" phenomena, which affect the heat exchange effect and cause fouling to grow rapidly. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving tubular heat exchanger for biofuel processing to overcome the above-mentioned shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving tubular heat exchanger for biofuel processing, comprising a shell, wherein the following are installed inside the shell: The heat exchange mechanism includes two tube sheets fixedly installed inside the shell, multiple tubes fixedly installed on the two tube sheets, and multiple baffles disposed between the two tube sheets. The multiple baffles are staggered along the length of the shell, and all multiple baffles are slidably sleeved on the outside of the tubes. The spacing adjustment mechanism, installed inside the housing, is used to adjust the distance between two adjacent baffles; The in-tube regulating mechanism, installed inside the shell, is used to intermittently regulate the flow rate of biofuel inside the tubes.

[0006] Furthermore, an oil inlet pipe and a drain pipe are installed at the bottom of the housing, with the oil inlet pipe located on the right side of one of the tube sheets and the drain pipe located on the left side of one of the tube sheets.

[0007] Furthermore, an oil drain pipe and a liquid inlet pipe are installed on the top of the housing, with the oil drain pipe located on the left side of another tube sheet and the liquid inlet pipe located on the right side of another tube sheet.

[0008] Furthermore, the spacing adjustment mechanism includes a plurality of first lead screws rotatably mounted inside the housing along its length and a motor mounted at one end of the housing; Multiple first lead screws are fixedly connected together. The first lead screw is a bidirectional lead screw. Every two baffles are sequentially threaded onto the outside of each first lead screw along the length of the housing. The inner walls on both sides of the housing are rotatably mounted with main shafts. The opposite ends of the two main shafts are fixedly connected to the ends of the left and right first lead screws. The output end of the motor is fixedly connected to one end of one of the main shafts.

[0009] Furthermore, the tube adjustment mechanism includes two second lead screws disposed on the right side of one of the tube sheets, sealing blocks threaded onto the outside of the two second lead screws respectively, and a linkage assembly for driving the two second lead screws to rotate. The sealing blocks are used to seal off a portion of the tubes, and the threads of the two second lead screws are turned in opposite directions.

[0010] Furthermore, a partition is installed inside the housing, and the second lead screw is rotatably mounted inside the partition.

[0011] Furthermore, the linkage assembly includes a first gear fixedly sleeved outside the main shaft and a second gear fixedly sleeved outside the two second lead screws respectively. The first gear meshes with the second gear, and both the first gear and the second gear are located on the right side of the partition.

[0012] Furthermore, two guide rods are fixedly installed inside the partition, and the two sealing blocks are slidably sleeved on the outside of the two guide rods respectively.

[0013] Compared with the prior art, the energy-saving tubular heat exchanger for biofuel processing provided by the present invention has the following advantages: 1. By intermittently adjusting the spacing between the baffles, the turbulence of the tubes in different areas can be significantly enhanced, the thermal boundary layer can be destroyed, the heat transfer coefficient can be significantly improved, and fouling formation can be delayed. 2. By intermittently sealing different tubes at different locations, the flow velocity inside other tubes increases after some tubes are sealed, achieving the effect of strong turbulence caused by sudden changes in flow velocity inside the tubes. This delays the formation of fouling inside the tubes and prevents the formation of a thermally resistive boundary layer due to constant flow velocity inside the tubes, which would hinder the heat exchange effect. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 3 This is a schematic diagram of the first spacing state of the baffle plate of the present invention; Figure 4 This is a schematic diagram of the second spacing state structure of the baffle plate of the present invention; Figure 5 This is a schematic diagram of the internal adjustment mechanism of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Shell; 2. Tube sheet; 3. Tubes; 4. Baffle plate; 5. Oil inlet pipe; 6. Drain pipe; 7. Oil drain pipe; 8. Drain pipe; 9. First lead screw; 10. Main shaft; 11. Second lead screw; 12. Sealing block; 13. Partition plate; 14. First gear; 15. Second gear; 16. Guide rod; 17. Motor. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] Example 1: Please refer to Figure 1 - Figure 4 An energy-saving tubular heat exchanger for biofuel processing includes a shell 1. An oil inlet pipe 5 and a liquid outlet pipe 6 are installed at the bottom of the shell 1. The oil inlet pipe 5 is located on the right side of one of the tube sheets 2, and the liquid outlet pipe 6 is located on the left side of one of the tube sheets 2. A heat exchange mechanism is installed inside the shell 1, which includes two tube sheets 2 fixedly installed inside the shell 1, multiple tubes 3 fixedly installed on the two tube sheets 2, and multiple baffles 4 disposed between the two tube sheets 2. The multiple baffles 4 are staggered along the length of the shell 1, and the multiple baffles 4 are slidably sleeved on the outside of the tubes 3. An oil outlet pipe 7 and a liquid inlet pipe 8 are installed at the top of the shell 1. The oil outlet pipe 7 is located on the left side of the other tube sheet 2, and the liquid inlet pipe 8 is located on the right side of the other tube sheet 2. Biofuel enters the shell 1 through the inlet pipe 5 and flows to the left through multiple tubes 3, and is finally discharged through the outlet pipe 7. During this process, coolant enters the shell 1 through the inlet pipe 8, flows to the right along the distribution direction of the baffles 4, and is finally discharged through the outlet pipe 6. In this process, the biofuel in the tube is cooled.

[0019] A spacing adjustment mechanism, installed inside the housing 1, is used to adjust the distance between two adjacent baffles 4. The spacing adjustment mechanism includes multiple first lead screws 9 rotatably installed inside the housing 1 along its length and a motor 17 installed at one end of the housing 1. The multiple first lead screws 9 are fixedly connected together. The first lead screws 9 are bidirectional lead screws and are made of wear-resistant, high-temperature resistant, and corrosion-resistant materials. Each pair of baffles 4 is sequentially threaded onto the outside of each first lead screw 9 along the length of the housing 1. Main shafts 10 are rotatably installed on the inner walls of both sides of the housing 1. The opposite ends of the two main shafts 10 are fixedly connected to the ends of the left and right first lead screws 9. The output end of the motor 17 is fixedly connected to one end of one of the main shafts 10. During the heat exchange process, the main shaft 10 is rotated clockwise by controlling the motor 17, and each first lead screw 9 rotates clockwise accordingly. This causes the two baffles 4 outside the first lead screw 9 to move closer to each other along the outside of the tube 3, making the distance between the two baffles 4 outside the same first lead screw 9 smaller and the distance between the baffles 4 outside adjacent first lead screws 9 larger. As a result, when the coolant passes between the two baffles 4 outside the same first lead screw 9, the flow velocity increases, enhancing the turbulence of the tube 3, destroying the thermal boundary layer, significantly improving the heat transfer coefficient, and delaying fouling formation. By controlling the motor 17 to drive the main shaft 10 to rotate counterclockwise, each first lead screw 9 rotates clockwise accordingly. This causes the two baffles 4 outside the first lead screw 9 to move away from each other along the outside of the tube 3, increasing the distance between the two baffles 4 outside the same first lead screw 9 and decreasing the distance between the baffles 4 outside adjacent first lead screws 9. As a result, the flow velocity of the coolant increases when it passes between the baffles 4 outside adjacent first lead screws 9. By intermittently adjusting the distance between the baffles 4, the turbulence of the tube 3 can be fully enhanced in different areas, the thermal boundary layer can be destroyed, the heat transfer coefficient can be significantly improved, and the formation of fouling can be delayed.

[0020] Example 2: Please refer to Figure 2 and Figure 5This embodiment provides a technical solution based on embodiment 1: an in-pipe adjustment mechanism, which is installed inside the housing 1 and is used to intermittently adjust the flow rate of biofuel inside the tube 3. The in-pipe adjustment mechanism includes two second lead screws 11 disposed on the right side of one of the tube plates 2, sealing blocks 12 respectively threaded on the outside of the two second lead screws 11, and a linkage assembly for driving the two second lead screws 11 to rotate. The sealing blocks 12 are used to seal part of the tube 3. The threads of the two second lead screws 11 are opposite. The second lead screws 11 are made of wear-resistant, high-temperature resistant, and corrosion-resistant materials. A partition 13 is installed inside the housing 1. The second lead screws 11 are rotatably installed inside the partition 13. The linkage assembly includes a first gear 14 fixedly sleeved on the outside of the main shaft 10 and a second gear 15 respectively fixedly sleeved on the outside of the two second lead screws 11. The first gear 14 and the second gear 15 mesh. The first gear 14 and the second gear 15 are both located on the right side of the partition 13. Two guide rods 16 are fixedly installed inside the partition 13. The two sealing blocks 12 are respectively slidably sleeved on the outside of the two guide rods 16. During the heat exchange process, when the motor 17 drives the main shaft 10 to rotate clockwise, the first gear 14 rotates accordingly. Through the meshing action between the first gear 14 and the two second gears 15, the two second lead screws 11 are driven to rotate counterclockwise synchronously. Since the threads of the two second lead screws 11 are opposite, when the two second lead screws 11 rotate counterclockwise, the upper sealing block 12 moves to the left to seal part of the tube end 3, and the lower sealing block 12 moves to the right to release the seal on part of the tube end 3. When the motor 17 drives the main shaft 10 to rotate counterclockwise, the first gear 14 rotates accordingly. Through the meshing action between the first gear 14 and the two second gears 15, the two second lead screws 11 are driven to rotate clockwise synchronously. Since the threads of the two second lead screws 11 are opposite, when the two second lead screws 11 rotate clockwise, the upper sealing block 12 moves to the right, releasing the seal on part of the tube end 3, and the lower sealing block 12 moves to the left, sealing part of the tube end 3. By intermittently sealing different tubes 3 at different locations, the flow velocity inside other tubes 3 increases after some tubes 3 are sealed. This achieves the effect of strong turbulence caused by sudden changes in flow velocity inside the tubes, delays the formation of fouling inside the tubes, and prevents the formation of a thermally resistive boundary layer due to constant flow velocity inside the tubes, which would hinder the heat exchange effect.

[0021] Working principle: During use, biofuel enters the shell 1 through the inlet pipe 5 and flows to the left through multiple tubes 3, finally exiting through the outlet pipe 7. During this process, coolant enters the shell 1 through the inlet pipe 8, flows to the right along the distribution direction of the baffles 4, and finally exits through the outlet pipe 6. This process cools the biofuel in the tubes. During heat exchange, the motor 17 drives the main shaft 10 to rotate clockwise, causing each first lead screw 9 to rotate clockwise. This causes the two baffles 4 outside the first lead screw 9 to move closer together along the outside of the tubes 3, reducing the distance between the two baffles 4 outside the same first lead screw 9 and increasing the distance between adjacent baffles outside the first lead screw 9. The increased spacing between the baffles 4 increases the flow velocity of the coolant as it passes between the two baffles 4 outside the same first lead screw 9, enhancing the turbulence of the tube 3, disrupting the thermal boundary layer, significantly improving the heat transfer coefficient, and delaying fouling formation. When the main shaft 10 rotates clockwise, the first gear 14 rotates accordingly. Through the meshing of the first gear 14 with the two second gears 15, the two second lead screws 11 rotate synchronously counterclockwise. Since the threads of the two second lead screws 11 rotate in opposite directions, when the two second lead screws 11 rotate counterclockwise, the upper sealing block 12 moves to the left to seal part of the tube 3 end, while the lower sealing block 12 moves to the right to release the seal on part of the tube 3 end. The sealing is achieved by controlling the motor 17 to drive the main shaft 10 to rotate counterclockwise, causing each first lead screw 9 to rotate clockwise. This, in turn, causes the two baffles 4 outside the first lead screw 9 to move away from each other along the outside of the tube 3, increasing the distance between the two baffles 4 outside the same first lead screw 9 and decreasing the distance between the baffles 4 outside adjacent first lead screws 9. As a result, the flow velocity of the coolant increases when it passes between the baffles 4 outside adjacent first lead screws 9. By intermittently adjusting the distance between the baffles 4, the turbulence of the tube 3 can be significantly enhanced in different areas, breaking down the thermal boundary layer, significantly improving the heat transfer coefficient, and delaying fouling formation. When the main shaft 10 rotates counterclockwise, the first gear 14 rotates accordingly. The meshing action between the first gear 14 and the two second gears 15 drives the two second lead screws 11 to rotate clockwise synchronously. Since the threads of the two second lead screws 11 rotate in opposite directions, when the two second lead screws 11 rotate clockwise, the upper sealing block 12 moves to the right, releasing the seal on the end of part of the tube 3, and the lower sealing block 12 moves to the left, sealing the end of part of the tube 3. By intermittently sealing different tubes 3 at different positions, after some tubes 3 are sealed, the flow velocity inside other tubes 3 increases, achieving the effect of strong turbulence caused by the sudden change in flow velocity inside the tube. This delays the formation of fouling inside the tube and prevents the formation of a thermally resistive boundary layer due to the constant flow velocity inside the tube, which would hinder the heat exchange effect.

[0022] It should be noted that the device structure and accompanying drawings of this invention mainly describe the principle of the invention. The technical details of the device's power mechanism, power supply system, and control system are not fully described. However, those skilled in the art, understanding the principles of the invention, can clearly understand the specifics of its power mechanism, power supply system, and control system. The control method described in the application is automatic control via a controller, and the controller's control circuit can be implemented through simple programming by those skilled in the art. The above description only illustrates certain exemplary embodiments of the invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of this invention.

[0023] In the description of this invention, it should be understood that the orientations or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. An energy-saving tubular heat exchanger for biofuel processing, comprising a shell (1), characterized in that, The interior of the housing (1) is equipped with: The heat exchange mechanism includes two tube sheets (2) fixedly installed inside the shell (1), multiple tubes (3) fixedly installed on the two tube sheets (2), and multiple baffles (4) disposed between the two tube sheets (2). The multiple baffles (4) are staggered along the length of the shell (1), and the multiple baffles (4) are all slidably sleeved on the outside of the tubes (3). A spacing adjustment mechanism, which is installed inside the housing (1), is used to adjust the distance between two adjacent baffles (4); An in-tube regulating mechanism, which is installed inside the housing (1), is used to intermittently regulate the flow rate of biofuel inside the tube (3).

2. The energy-saving tubular heat exchanger for biofuel processing according to claim 1, characterized in that, The bottom of the housing (1) is equipped with an oil inlet pipe (5) and a drain pipe (6). The oil inlet pipe (5) is located on the right side of one of the tube sheets (2), and the drain pipe (6) is located on the left side of one of the tube sheets (2).

3. The energy-saving tubular heat exchanger for biofuel processing according to claim 2, characterized in that, The top of the housing (1) is equipped with an oil drain pipe (7) and an inlet pipe (8). The oil drain pipe (7) is located on the left side of another tube sheet (2), and the inlet pipe (8) is located on the right side of another tube sheet (2).

4. The energy-saving tubular heat exchanger for biofuel processing according to claim 3, characterized in that, The spacing adjustment mechanism includes a plurality of first lead screws (9) rotatably installed inside the housing (1) along the length direction thereof and a motor (17) installed at one end of the housing (1). Multiple first lead screws (9) are fixedly connected together. The first lead screw (9) is a bidirectional lead screw. Every two baffles (4) are sequentially threaded onto the outside of each first lead screw (9) along the length direction of the housing (1). The inner walls on both sides of the housing (1) are rotatably mounted with main shafts (10). The opposite ends of the two main shafts (10) are fixedly connected to the ends of the left and right first lead screws (9). The output end of the motor (17) is fixedly connected to one end of one of the main shafts (10).

5. An energy-saving tubular heat exchanger for biofuel processing according to claim 4, characterized in that, The tube adjustment mechanism includes two second lead screws (11) disposed on the right side of one of the tube plates (2), sealing blocks (12) respectively threaded on the outside of the two second lead screws (11), and a linkage assembly for driving the two second lead screws (11) to rotate. The sealing blocks (12) are used to seal a portion of the tubes (3), and the threads of the two second lead screws (11) are turned in opposite directions.

6. An energy-saving tubular heat exchanger for biofuel processing according to claim 5, characterized in that, A partition (13) is installed inside the housing (1), and the second lead screw (11) is rotatably installed inside the partition (13).

7. An energy-saving tubular heat exchanger for biofuel processing according to claim 6, characterized in that, The linkage assembly includes a first gear (14) fixedly sleeved outside the main shaft (10) and a second gear (15) fixedly sleeved outside the two second lead screws (11). The first gear (14) meshes with the second gear (15), and both the first gear (14) and the second gear (15) are located on the right side of the partition (13).

8. An energy-saving tubular heat exchanger for biofuel processing according to claim 7, characterized in that, Two guide rods (16) are fixedly installed inside the partition (13), and two sealing blocks (12) are slidably sleeved on the outside of the two guide rods (16).

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