Reboiler for producing petroleum mixed xylene

Abstract

The utility model discloses a reboiler for producing petroleum mixed xylene, which comprises a supporting table and a shunt gas outlet pipe, a heat exchange box is fixedly arranged on the upper surface of the middle of the supporting table, a gas inlet box and a gas outlet box are respectively arranged on the side edges of two ends of the heat exchange box, a heat exchange pipe is rotatably arranged in the heat exchange box, and a rotating mechanism is arranged at the end part of the heat exchange pipe. The side end, away from the heat exchange box, of the air outlet box is sleeved with the top end of the branch air outlet pipe, the outer surface of the bottom end of the branch air outlet pipe is fixedly sleeved with the inner surface of the heat exchange box, the side end of the bottom of the branch air outlet pipe is fixedly sleeved with a multi-fold communicating pipe, and the outer surface of the multi-fold communicating pipe is fixedly sleeved with the inner surface of the heat exchange box. An exhaust pump is arranged at the side end of the bottom of the multi-fold communicating pipe and fixedly installed on the side face of the bottom of the supporting table, and the air inlet end is fixedly connected with the middle of the bottom end of the multi-fold communicating pipe in a sleeved mode. According to the utility model, the waste heat of the high-temperature fluid is guided back, so that the heat preservation and even heating effects of the heat exchange box are assisted, and the utilization rate of resources is improved.

Description

Technical Field

[0001] This utility model relates to the field of reboiler technology, and more specifically, to a reboiler for the production of petroleum mixed xylene. Background Technology

[0002] Reboilers are key pieces of equipment in petrochemical and distillation processes, primarily used to provide vapor reflux and heat for distillation columns. In the production of mixed xylenes, reboilers are mainly used for bottom heating in xylene fractionation columns.

[0003] A search revealed CN213131941U, which discloses a bottom reboiler, including a base. Four legs are fixedly connected to the lower end of the base. From left to right, a first connecting box, a heat exchange box, and a second connecting box are fixedly connected to the upper end of the base. Both ends of the heat exchange box are rotatably connected to heat exchange tubes that penetrate the heat exchange box and connect the first and second connecting boxes. A first gear is fixedly connected to the outside of the heat exchange tubes, located between the heat exchange box and the second connecting box. A motor is fixedly connected to the left end of the second connecting box, and a second gear meshing with the first gear is fixedly connected to the output end of the motor. This bottom reboiler has advantages such as high efficiency and reduced scaling.

[0004] However, the aforementioned reboiler at the bottom of the tower still has room for optimization in practical applications: although its spiral rotating heat exchanger design improves heat exchange efficiency and reduces scaling by extending contact time and rotational shear force, the system lacks a high-temperature fluid reflux device. The high-temperature medium after heat exchange still has usable waste heat; direct discharge leads to heat energy waste and reduces overall energy utilization efficiency. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, this utility model provides a reboiler for the production of petroleum mixed xylene, so as to solve the problem that although the reboiler with partial spiral rotating heat exchange tubes in the prior art improves efficiency, it does not have a waste heat recovery system and the direct discharge of high-temperature fluid leads to energy waste.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a reboiler for the production of petroleum mixed xylene, comprising...

[0007] A support platform is provided, on the upper surface of the middle part of the support platform, a heat exchange box is fixedly installed, a gas phase discharge pipe is sleeved on the top of the heat exchange box, and a liquid phase inlet and outlet pipe is sleeved on the bottom. End caps are fixedly sleeved on the inner surfaces of both ends of the heat exchange box. An air inlet box and an air outlet box are respectively installed on the side edges of both ends of the heat exchange box. A heat exchange tube is rotatably installed inside the heat exchange box, and a rotating mechanism is provided at the end of the heat exchange tube.

[0008] The top end of the vent pipe is sleeved on the side of the vent box away from the heat exchange box. The outer surface of the bottom end of the vent pipe is fixedly sleeved with the inner surface of the heat exchange box. A multi-fold connecting pipe is fixedly sleeved on the side of the bottom end of the vent pipe. The outer surface of the multi-fold connecting pipe is fixedly sleeved with the inner surface of the heat exchange box. An exhaust pump is provided on the side of the bottom end of the multi-fold connecting pipe. The exhaust pump is fixedly installed on the side of the bottom of the support platform, and its inlet end is fixedly sleeved with the middle of the bottom end of the multi-fold connecting pipe.

[0009] The outer surfaces of both ends of the heat exchange tube are rotatably mounted to the inner surfaces of the middle part of the two end plates. The air inlet box and the air outlet box are symmetrically arranged and are respectively bolted to both ends of the heat exchange box.

[0010] The outer surface of the bottom end of the multi-fold connecting pipe is fitted with a heat dissipation fin plate. The upper surface and side of the heat dissipation fin plate are fixedly installed to the lower surface of the top of the support and the side away from the exhaust pump, respectively. A frame is fixedly installed on the side end of the heat dissipation fin plate. A second motor is fixedly installed in the middle of the frame. A fan is fixedly fitted on the output end of the second motor.

[0011] It also includes a displacement mechanism and an arc-shaped scraper. Two sets of displacement mechanisms are arranged inside the middle of the heat exchange box. The two sets of displacement mechanisms are arranged symmetrically on the left and right. Two arc-shaped scrapers are slidably sleeved on the inner surface of the heat exchange box. The two arc-shaped scrapers are arranged symmetrically, with their bottom ends fixedly installed on the surface of the displacement mechanism and their outer surfaces slidably installed on the inner wall of the heat exchange box.

[0012] The displacement mechanism includes a fixed plate and a track. Each end of the track is fitted with a pulley. The middle portions of the two pulleys are rotatably mounted on the surface of the fixed plate. The far ends of the two fixed plates are respectively fixedly mounted to the surfaces of two end plates that are close to each other. A cover is fixedly mounted on the side of the fixed plate. A motor is fixedly mounted on the inner surface of the cover. The output end of the motor is fixedly fitted to the middle portion of the pulley. A connecting block is fixedly mounted on the surface of the track, and the surface of the connecting block is fixedly mounted to the end of an arc-shaped scraper.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] In the above scheme, by setting up structures such as multi-fold connecting pipes, during the heating and reboiling process, the high-temperature fluid still carrying residual heat discharged from the outlet box can be diverted by the exhaust pump through the interlocking branch outlet pipes and introduced into the interior of two multi-fold connecting pipes installed inside the base. The multi-fold design of the multi-fold connecting pipes increases the residence time of the high-temperature fluid inside the multi-fold connecting pipes, and transfers the residual heat to the base, and continues to transfer it upwards to the bottom of the heat exchange box and the fractionated liquid at the bottom of the heat exchange box. Thus, by utilizing the return of the residual heat of the high-temperature fluid, the heat exchange box and the liquid at the bottom are kept warm or even heated, thereby improving the utilization rate of resources.

[0015] In the above scheme, by setting up a displacement mechanism and an arc-shaped scraper, the motor is first started, and the pulley fixedly connected to its output end will rotate, driving the track to move. Simultaneously, it pulls the other pulley at the other end of the track to rotate on the side of the fixed plate. As the track moves, the connecting block connected to the track surface will move synchronously, causing the back-and-forth connecting blocks connected to the upper and lower surfaces of the track to move in opposite directions. This causes the two arc-shaped scrapers to move in opposite directions against the inner wall of the heat exchange box, scraping off the scale on the inner wall. Thus, by controlling the motor to rotate intermittently in both directions, the arc-shaped scrapers move back and forth along the inner wall of the heat exchange box, achieving the cleaning operation of the inner wall. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the end cap, air inlet box, air outlet box, etc. of this utility model;

[0018] Figure 3 This is a schematic diagram of the displacement mechanism structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the present invention, including the diversion outlet pipe, the multi-fold connecting pipe, and the exhaust pump.

[0020] [Figure Labels]

[0021] 1. Support platform; 2. Base; 3. Heat exchange box; 4. End plate; 5. Air inlet box; 6. Air outlet box; 7. Heat exchange tube; 8. Rotation mechanism; 9. Displacement mechanism; 90. Fixing plate; 91. Motor 1; 92. Cover box; 93. Pulley; 94. Track; 95. Connecting block; 10. Arc-shaped scraper; 11. Diverting air outlet pipe; 12. Multi-fold connecting pipe; 13. Exhaust pump; 14. Heat dissipation fin plate; 15. Frame; 16. Motor 2; 17. Fan. Detailed Implementation

[0022] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0023] As attached Figure 1 To be continued Figure 4 An embodiment of this utility model provides a reboiler for the production of petroleum-mixed xylene, including...

[0024] A support platform 1 is provided. A heat exchange box 3 is fixedly installed on the upper surface of the middle part of the support platform 1. A gas phase discharge pipe is sleeved on the top of the heat exchange box 3, and a liquid phase inlet and outlet pipe is sleeved on the bottom. End caps 4 are fixedly sleeved on the inner surfaces of both ends of the heat exchange box 3. An air inlet box 5 and an air outlet box 6 are respectively installed on the side edges of both ends of the heat exchange box 3. A heat exchange tube 7 is rotatably installed inside the heat exchange box 3. A rotating mechanism 8 is provided at the end of the heat exchange tube 7.

[0025] The top end of the vent pipe 11 is sleeved on the side of the outlet box 6 away from the heat exchange box 3. The outer surface of the bottom end of the vent pipe 11 is fixedly sleeved with the inner surface of the heat exchange box 3. The side end of the bottom of the vent pipe 11 is fixedly sleeved with a multi-fold connecting pipe 12. The outer surface of the multi-fold connecting pipe 12 is fixedly sleeved with the inner surface of the heat exchange box 3. An exhaust pump 13 is provided at the side end of the bottom of the multi-fold connecting pipe 12. The exhaust pump 13 is fixedly installed on the side of the bottom of the support platform 1, and its inlet end is fixedly sleeved with the middle part of the bottom end of the multi-fold connecting pipe 12.

[0026] Among them, the outer surfaces of both ends of the heat exchange tube 7 are rotatably installed with the inner surfaces of the middle part of the two end plates 4, the air inlet box 5 and the air outlet box 6 are symmetrically arranged, and are respectively bolted to both ends of the heat exchange box 3.

[0027] The multi-fold connecting pipe 12 has a heat dissipation fin plate 14 fitted onto its outer surface at the bottom. The upper surface and side of the heat dissipation fin plate 14 are fixedly installed on the lower surface of the top of the support platform 1 and the side away from the exhaust pump 13, respectively. A frame 15 is fixedly installed on the side end of the heat dissipation fin plate 14, and a second motor 16 is fixedly installed in the middle of the frame 15. A fan 17 is fixedly fitted onto the output end of the second motor 16. By setting the heat dissipation fin plate 14, before the high-temperature fluid inside the multi-fold connecting pipe 12 is completely discharged by the exhaust pump 13, the heat can be further cooled by the heat dissipation fin plate 14 when it flows through the section of the multi-fold connecting pipe 12 fitted into the heat dissipation fin plate 14. The rotation of the fan 17 driven by the second motor 16 is used to improve the heat dissipation effect, thereby further cooling the discharged high-temperature fluid and avoiding thermal pollution.

[0028] It also includes a displacement mechanism 9 and an arc-shaped scraper 10. Two sets of displacement mechanisms 9 are arranged inside the middle of the heat exchange box 3. The two sets of displacement mechanisms 9 are arranged symmetrically on the left and right. Two arc-shaped scrapers 10 are slidably sleeved on the inner surface of the heat exchange box 3. The two arc-shaped scrapers 10 are symmetrically arranged, with their bottom ends fixedly installed on the surface of the displacement mechanism 9 and their outer surfaces slidably installed on the inner wall of the heat exchange box 3.

[0029] The displacement mechanism 9 includes a fixed plate 90 and a track 94. Both ends of the track 94 are fitted with pulleys 93. The middle of the two pulleys 93 is rotatably mounted on the surface of the fixed plate 90. The far ends of the two fixed plates 90 are fixedly mounted to the surfaces of the two end plates 4 that are close to each other. A cover box 92 is fixedly mounted on the side of the fixed plate 90. A motor 91 is fixedly mounted on the inner surface of the cover box 92. The output end of the motor 91 is fixedly fitted to the middle of the pulleys 93. A connecting block 95 is fixedly mounted on the surface of the track 94. The surface of the connecting block 95 is fixedly mounted to the end of the arc-shaped scraper 10.

[0030] The working process of this utility model is as follows:

[0031] When the above-mentioned reboiler is in use, the gas phase discharge pipe, liquid phase inlet and outlet pipes fitted at the top and bottom of the heat exchange box 3 are first connected to the fractionation tower. Then, the high-temperature fluid is introduced into the interior of the heat exchange tube 7 from the end of the gas inlet box 5. Inside the heat exchange box 3, the heat is transferred to the fractionated liquid, causing the fractionated liquid to heat up and vaporize. It then flows into the fractionation tower through the gas phase discharge pipe. During this process, the heat exchange tube 7 can also be driven to rotate inside the heat exchange box 3 by a rotating mechanism 8 composed of a motor and gears, allowing the fractionated liquid in the bottom cavity to undergo more thorough heat exchange.

[0032] During the aforementioned heating and reboiling process, the high-temperature fluid still carrying residual heat discharged from the outlet box 6 can be diverted through the interlocking outlet pipe 11 and introduced into the interior of the two multi-fold connecting pipes 12 installed inside the base 2 under the guidance of the exhaust pump 13. The multi-fold design of the multi-fold connecting pipes 12 increases the time that the high-temperature fluid stays inside the multi-fold connecting pipes 12, and transfers the residual heat to the base 2, and continues to transfer it upward to the bottom of the heat exchange box 3 and the fractionated liquid at the bottom of the heat exchange box 3, thus assisting in the heat preservation and even heating effect of the heat exchange box 3 and the liquid at the bottom.

[0033] When the heat exchange box 3 is in use, the displacement mechanism 9 can periodically pull the two arc-shaped scrapers 10 to move along the inner wall of the bottom or top of the heat exchange box 3 to clean the scale on the inner surface of the heat exchange box 3. Specifically, the motor 91 is started first, and the pulley 93 fixedly connected to its output end will rotate, driving the track 94 to move. At the same time, the other pulley 93 at the other end of the track 94 is pulled to rotate on the side of the fixed plate 90. As the track 94 moves, the connecting block 95 connected to the surface of the track 94 will move synchronously, so that the back-and-forth connecting blocks 95 connected to the upper and lower surfaces of the track 94 move in opposite directions, driving the two arc-shaped scrapers 10 to move in opposite directions against the inner wall of the heat exchange box 3 to scrape off the scale on the inner wall.

[0034] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0035] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0036] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reboiler for the production of petroleum-mixed xylene, characterized in that, include A support platform (1) is provided with a heat exchange box (3) fixedly installed on the upper surface of the middle part of the support platform (1). A gas phase discharge pipe is sleeved on the top of the heat exchange box (3), and a liquid phase inlet and outlet pipe is sleeved on the bottom. End caps (4) are fixedly sleeved on the inner surfaces of both ends of the heat exchange box (3). An air inlet box (5) and an air outlet box (6) are respectively installed on the side edges of both ends of the heat exchange box (3). A heat exchange tube (7) is rotatably installed inside the heat exchange box (3). A rotating mechanism (8) is provided at the end of the heat exchange tube (7). The top end of the split outlet pipe (11) is sleeved on the side of the outlet box (6) away from the heat exchange box (3). The outer surface of the bottom end of the split outlet pipe (11) is fixedly sleeved with the inner surface of the heat exchange box (3). The side end of the bottom of the split outlet pipe (11) is fixedly sleeved with a multi-fold connecting pipe (12). The outer surface of the multi-fold connecting pipe (12) is fixedly sleeved with the inner surface of the heat exchange box (3). An exhaust pump (13) is provided at the side end of the bottom of the multi-fold connecting pipe (12). The exhaust pump (13) is fixedly installed on the side of the bottom of the support platform (1), and the air inlet end is fixedly sleeved with the middle part of the bottom end of the multi-fold connecting pipe (12).

2. The reboiler for producing petroleum-mixed xylene according to claim 1, characterized in that, The outer surfaces of both ends of the heat exchange tube (7) are rotatably mounted to the inner surfaces of the middle part of the two end plates (4). The air inlet box (5) and the air outlet box (6) are symmetrically arranged and are bolted to both ends of the heat exchange box (3).

3. The reboiler for producing petroleum-mixed xylene according to claim 1, characterized in that, A heat dissipation fin plate (14) is sleeved on the outer surface of the bottom end of the multi-fold connecting pipe (12). The upper surface and side of the heat dissipation fin plate (14) are fixedly installed on the lower surface of the top of the support (1) and the side away from the exhaust pump (13), respectively. A frame (15) is fixedly installed on the side end of the heat dissipation fin plate (14). A second motor (16) is fixedly installed in the middle of the frame (15). A fan (17) is fixedly sleeved on the output end of the second motor (16).

4. The reboiler for producing petroleum-mixed xylene according to claim 1, characterized in that, It also includes a displacement mechanism (9) and an arc-shaped scraper (10). Two sets of the displacement mechanism (9) are arranged inside the middle of the heat exchange box (3). The two sets of displacement mechanisms (9) are arranged symmetrically on the left and right. Two arc-shaped scrapers (10) are slidably sleeved on the inner surface of the heat exchange box (3). The two arc-shaped scrapers (10) are symmetrically arranged. The bottom end is fixedly installed with the surface of the displacement mechanism (9), and the outer surface is slidably installed with the inner wall of the heat exchange box (3).

5. The reboiler for producing petroleum-mixed xylene according to claim 4, characterized in that, The displacement mechanism (9) includes a fixed plate (90) and a track (94). Both ends of the track (94) are fitted with pulleys (93). The middle of the two pulleys (93) is rotatably mounted on the surface of the fixed plate (90). The ends of the two fixed plates (90) that are far apart from each other are fixedly mounted on the surfaces of the two end plates (4) that are close to each other. A cover box (92) is fixedly mounted on the side of the fixed plate (90). A motor (91) is fixedly mounted on the inner surface of the cover box (92). The output end of the motor (91) is fixedly fitted with the middle of the pulley (93). A connecting block (95) is fixedly mounted on the surface of the track (94). The surface of the connecting block (95) is fixedly mounted on the end of the arc-shaped scraper (10).

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