A preheating device for production of benzene hydrogenation unit

Abstract

The present invention relates to the field of heating reaction furnaces, and discloses a preheating device for benzene hydrogenation production, comprising a main body insulation shell, an inner reaction box is arranged in the main body insulation shell, a plurality of U-shaped heating tubes are arranged in a ring shape with equal intervals between the inner reaction box and the main body insulation shell, the U-shaped heating tubes are slidably connected with a descaling structure in the furnace, a water tank is arranged at the upper end of the main body insulation shell, the upper end of the water tank is connected with the heat-conducting descaling structure, the water tank is connected with a water pump, the water pump is connected with the main body insulation shell, the descaling structure in the furnace comprises a first gear, and the first gear is meshed with a symmetrically arranged second gear. The preheating device for benzene hydrogenation production provided by the present invention effectively solves the problems of slow preheating of the existing benzene hydrogenation water heating reaction furnace, large energy consumption of the heat-conducting tube, poor recovery and insulation circulation of the subsequent hot water, and scale will be generated by long-term use of the heating tube, which will seriously affect the heat conduction between water and the heat conduction between the heating tube and water.

Description

Technical Field

[0001] The invention relates to the technical field of heating reaction furnaces, in particular to a preheating device for production of a benzene hydrogenation device. Background Art

[0002] Patent publication number CN115046400A discloses a waste heat utilization device for a benzene hydrogenation heating furnace, comprising a heating furnace body, a feed pipe and a discharge pipe. Support legs are installed at the four corners of the bottom end of the heating furnace body, a feed pipe is installed on one side of the support leg, and a first solenoid valve is provided inside the feed pipe. A discharge pipe is installed on the side of the heating furnace body close to the feed pipe, and a second solenoid valve is provided inside the discharge pipe. A fuel gas pipe is provided at the bottom end of the heating furnace body, and a third solenoid valve is provided on the outer wall of the fuel gas pipe. An outlet pipe is installed at the top of the heating furnace body, a support frame is provided on the side of the heating furnace body away from the discharge pipe, and a conveying mechanism for recycling waste heat is provided at the top of the support frame. The device conveys the air after heat exchange to the bottom of the heating furnace body through the waste heat pipe. By adding oxygen, the combustion of the heating furnace body is accelerated, and the recycling of waste heat has the effect of energy saving and environmental protection.

[0003] However, existing benzene hydrogenation heating methods typically use water, not air. The choice of heating method significantly impacts reaction efficiency and product quality during benzene hydrogenation. Specifically, the benzene hydrogenation reaction requires a specific temperature and pressure, typically employing high pressure and low temperature to promote the reaction. Water heating provides stable temperature control, avoiding the temperature fluctuations and impurity issues that can arise from air heating. Furthermore, the benzene hydrogenation furnace is a key piece of equipment in the chemical industry, primarily heating benzene and the hydrogenating agent to facilitate the reaction. The optimal temperature range for benzene hydrogenation is 144°C to 145°C. At this temperature, the reaction efficiency is significantly improved, with the yield of the target product, cyclohexene, increasing by seven percentage points, and the conversion and selectivity consistently controlled above 45% and 79%.

[0004] Preheating is an important step in using a benzene hydrogenation water heating reactor. However, existing benzene hydrogenation water heating reactors preheat slowly, consume a lot of energy in the heat pipes, and have poor heat preservation and recycling for subsequent hot water. Furthermore, long-term use of the heating pipes will produce scale, which will seriously affect the heat conduction between the water and between the heating pipes and the water.

[0005] Therefore, the present invention provides a preheating device for benzene hydrogenation production to solve the above problems. Summary of the Invention

[0006] The present invention aims to address the problem of preheating, a crucial step in heating a benzene hydrogenation water reactor. However, existing benzene hydrogenation water reactors preheat slowly, consume significant energy in their heat pipes, and offer poor heat preservation and recycling for subsequent hot water. Furthermore, the heating pipes can build up scale over time, severely impacting heat transfer between the water and the heating pipes themselves.

[0007] To solve the above technical problems, the technical solution of the present invention is as follows: a preheating device for a benzene hydrogenation unit, comprising a main body insulation shell, an inner reaction box disposed within the main body insulation shell, a plurality of U-shaped heating tubes equidistantly disposed in a circular pattern between the inner reaction box and the main body insulation shell, the U-shaped heating tubes being slidably connected to a descaling structure within the furnace, a water tank being disposed at the upper end of the main body insulation shell, the upper end of the water tank being connected to the heat-conducting descaling structure, the water tank being connected to a water pump, and the water pump being connected to the main body insulation shell;

[0008] The in-furnace descaling structure includes a first gear, the first gear is meshed with a symmetrically arranged second gear, the bottom of the second gear is connected to one end of a reciprocating screw, the other end of the reciprocating screw is rotatably connected to a limiting ring at the lower end of a U-shaped heating tube, the limiting ring is connected to the bottom of the main insulation shell, and the reciprocating screw is threadedly connected to a positioning ring;

[0009] The heat conduction and descaling structure includes a heat conduction plate, the outer ring of the heat conduction plate is connected to the annular cover, a rotating bearing is arranged in the middle position inside the annular cover, the inner ring of the rotating bearing is connected to the outer ring of the rotating rod, and the outer ring of the rotating bearing is provided with multiple scrapers in an annular shape and equidistantly spaced relationship, the scrapers are in contact with the bottom of the heat conduction plate and the inner wall of the annular cover, the annular cover is provided with an oblique hole, and the oblique hole is connected to the guide pipe.

[0010] Furthermore, the positioning ring has symmetrical perforations, the perforations are slidably connected to the stabilizing rod, the two ends of the stabilizing rod are connected to the inner wall of the main insulation shell and the limiting ring, the positioning ring has scraping holes, and the scraping holes are slidably connected to the U-shaped heating tube.

[0011] Furthermore, the top of the scraping hole of the positioning ring is connected to the bottom of multiple high-temperature hoses, and the top of the high-temperature hose is connected to the scraping ring.

[0012] Furthermore, the inner ring of the first gear is connected to one end of the rotating rod, and the rotating rod passes through the water tank, the heat conduction plate, the annular cover and is rotatably connected to the top of the inner wall of the wheel cover. The outer ring of the other end of the rotating rod is fixedly connected to one end of the equally spaced blades, and the edge of the blade is in contact with the inner wall of the wheel cover. The wheel cover is connected to one end of the second steam pipe, the other end of the second steam pipe is connected to one end of the steam valve, the other end of the steam valve is connected to one end of the first steam pipe, and the other end of the first steam pipe is connected to the upper end of the main insulation shell.

[0013] Furthermore, one end of the water pump is connected to a three-way valve, and the other two ends of the three-way valve are connected to the water tank and the main insulation shell through pipelines respectively.

[0014] Furthermore, a filter tank is provided in the pipeline between the main body insulation shell and the three-way valve, the upper end of the filter tank is connected to the main body insulation shell, and the lower end of the filter tank is connected to the three-way valve.

[0015] Furthermore, an opening valve is provided in the water tank, and the opening valve is connected to the flow equalizing device. The flow equalizing device includes a water collecting shell provided at the lower end of the cover plate, and the water collecting shell has guide holes equidistantly provided in a ring shape. The guide holes are connected to the middle position of the outer circle of the conduit, and the lower end of the conduit corresponds to the upper end of the U-shaped heating tube.

[0016] Furthermore, an arc-shaped opening is provided at the lower end of the conduit, and the arc-shaped opening corresponds to the upper end of the U-shaped heating tube.

[0017] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0018] (1) The three-way valve can switch the heating cycle between the water tank and the heat-conducting and descaling structure and the water in the main insulation shell. At the same time, the heat-conducting and descaling structure can convert solar radiation energy into thermal energy to heat the water, thereby reducing the time for the U-shaped heating tube to heat the water, so that the predetermined temperature of the benzene hydrogenation reaction can be quickly reached, thereby improving efficiency and further reducing energy consumption. Through the contact between water and air, a large amount of water vapor is formed in the main insulation shell. After a large amount of water vapor flows into the bottom of the main insulation shell, the water vapor is pressurized and rises into the first steam pipe. The steam valve opens, and the blades in the wheel cover rotate through the first steam pipe, thereby driving the rotating rod, and the rotating rod drives the first gear, so that the motor is no longer needed. Transmission further improves the energy utilization rate. Through the transmission of the first gear, the second gear and the reciprocating screw, the rotation of the reciprocating screw can cause the positioning ring to move up and down, and the high-temperature hose on the positioning ring rises and falls, thereby driving the scraper ring to rise and fall to scrape the scale off the outer wall of the U-shaped heating tube. At the same time, the curved part of the U-shaped heating tube will pass through the bending of the high-temperature hose, thereby being scraped off by the scraper ring, thereby more comprehensively scraping off the scale on the surface of the U-shaped heating tube, so that the thermal conductivity of the U-shaped heating tube will not decrease with the increase of scale. The scale cleaned off the outer wall of the U-shaped heating tube enters the filter tank for filtration, so that personnel can complete the removal of scale by regularly cleaning the filter tank to avoid scale affecting the heat conduction between water.

[0019] (2) Water can be pumped out of the main insulation shell by the water pump. At the same time, the scale cleaned from the outer wall of the U-shaped heating tube enters the filter tank for filtration, thereby pumping out water without scale into the guide pipe. The water in the guide pipe is drained through the oblique holes, causing the scraper to rotate to clean the scale in the heat transfer plate and the annular cover, ensuring the thermal conductivity of the heat transfer plate. Finally, it flows back into the water tank through the through hole connected to the water tank. At the same time, after the water in the main insulation shell is completely pumped out, the three-way valve switches the water pump to connect with the water tank, so that the heat transfer plate heats and insulates the water in the water tank.

[0020] (3) The water is heated by the heat conduction plate and enters the water tank. The valve is opened to introduce the water in the water tank into the water collecting shell. As the water is injected, the water level gradually rises above the guide tube. Through the guide tube, the water evenly enters the arc-shaped opening at the lower end of each guide tube and flows into the upper end of the U-shaped heating tube. The water is then heated along the U-shaped heating tube, which makes the water temperature rise faster, thereby improving the efficiency of the benzene hydrogenation reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure inside the main insulation shell of the present invention;

[0023] Figure 3 A top view of the present invention;

[0024] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 5 Schematic diagram of the structure of the descaling structure in the furnace of the present invention;

[0026] Figure 6 This is a schematic structural diagram of the first gear and the second gear in the present invention;

[0027] Figure 7 A schematic diagram of the bending of the high-temperature hose structure of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the positioning ring in the present invention;

[0029] Figure 9 Schematic diagram of the bottom structure of the water collecting shell in the present invention;

[0030] Figure 10 It is a structural schematic diagram of the water collecting shell and the cover plate in the present invention;

[0031] Figure 11 for Figure 9 Enlarged view of point B in the middle;

[0032] Figure 12It is a structural schematic diagram of the heat-conducting and descaling structure of the present invention.

[0033] In the figure: 1-main body insulation shell, 11-inner reaction box, 2-water tank, 21-opening valve, 3-heat conduction and descaling structure, 31-heat conduction plate, 32-annular cover, 33-scraper, 34-rotating bearing, 35-oblique hole, 4-descaling structure in the furnace, 41-first steam pipe, 42-steam valve, 43-second steam pipe, 44-rotating rod, 441-wheel cover, 45-first gear, 46-second gear, 47-reciprocating screw, 48-positioning ring, 481-high temperature hose, 482-scraper ring, 49-stabilizing rod, 5-water pump, 51-diversion pipe, 6-three-way valve, 7-U-shaped heating pipe, 71-limiting ring, 8-flow uniformity device, 81-cover plate, 82-water collecting shell, 83-conduit, 833-arc-shaped mouth, 9-filter tank. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0035] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words “including” or “comprising” and the like used in this disclosure mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words “connected” or “connected” and the like are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0036] like Figures 1 to 12As shown, the present invention provides a preheating device for benzene hydrogenation production, including a main body insulation shell 1, an inner reaction box 11 is arranged in the main body insulation shell 1, and a plurality of U-shaped heating tubes 7 are arranged in an annular manner and equidistantly between the inner reaction box 11 and the main body insulation shell 1. The U-shaped heating tubes 7 are slidably connected to the descaling structure 4 in the furnace. A water tank 2 is arranged at the upper end of the main body insulation shell 1. The water tank 2 is annular, and the upper end of the water tank 2 is connected to the heat-conducting descaling structure 3. The water tank 2 is connected to the water pump 5, and the water pump 5 is connected to the main body insulation shell 1. One end of the water pump 5 It is connected to the three-way valve 6, and the other two ends of the three-way valve 6 are connected to the water tank 2 and the main insulation shell 1 through pipelines. The three-way valve 6 can switch the heating cycle between the water tank and the heat-conducting and descaling structure 3 and the water in the main insulation shell 1 can be extracted. At the same time, the heat-conducting and descaling structure 3 can convert solar radiation energy into thermal energy to heat water, thereby reducing the time for the U-shaped heating tube 7 to heat the water, so as to quickly reach the predetermined temperature of the benzene hydrogenation reaction, thereby improving efficiency and further reducing energy consumption.

[0037] The in-furnace descaling structure 4 includes a first gear 45, which is meshed with a symmetrically arranged second gear 46. The bottom of the second gear 46 is connected to one end of a reciprocating screw 47, and the other end of the reciprocating screw 47 is rotatably connected to a limiting ring 71 at the lower end of the U-shaped heating tube 7. The limiting ring 71 is connected to the bottom of the main insulation shell 1, and the reciprocating screw 47 is threadedly connected to the positioning ring 48. Through the transmission of the first gear 45, the second gear 46 and the reciprocating screw 47, the rotation of the reciprocating screw 47 can cause the positioning ring 48 to move up and down, and finally the outer wall of the U-shaped heating tube 7 is scraped off the scale.

[0038] The heat conduction and descaling structure 3 includes a heat conduction plate 31, the outer ring of the heat conduction plate 31 is connected to the annular cover 32, a rotating bearing 34 is arranged in the middle position inside the annular cover 32, the inner ring of the rotating bearing 34 is connected to the outer ring of the rotating rod 44, and the outer ring of the rotating bearing 34 is annularly and equidistantly provided with multiple scrapers 33, the scrapers 33 are in contact with the bottom of the heat conduction plate 31 and the inner wall of the annular cover 32, the annular cover 32 is provided with an oblique hole 35, and the oblique hole 35 is connected to the guide pipe 51. After the reaction heating of benzene and hydrogen in the inner reaction box 11 is completed, the steam valve 42 is opened, and the three-way valve 6 switches the water pump 5 to be connected to the main insulation shell 1, and the water pump 5 can pump water out of the main insulation shell 1, and at the same time, the scale cleaned off the outer wall of the U-shaped heating tube 7 enters the filter tank 9 for filtration, thereby pumping out water without scale and entering the guide pipe 51. The water in the guide pipe 51 is drained through the oblique holes 35 to cause the scraper 33 to rotate and clean the scale in the heat conduction plate 31 and the annular cover 32, thereby ensuring the thermal conductivity of the heat conduction plate 31. Finally, it flows back into the water tank 2 through the through hole connected to the water tank 2. At the same time, after the water in the main insulation shell 1 is completely pumped out, the three-way valve 6 switches the water pump 5 to communicate with the water tank 2, so that the heat conduction plate 31 heats and keeps the water in the water tank 2 warm.

[0039] The positioning ring 48 is symmetrically provided with perforations, which are slidably connected to the stabilizing rod 49. The two ends of the stabilizing rod 49 are connected to the inner wall of the main insulation shell 1 and the limit ring 71. The positioning ring 48 is provided with scraping holes, which are slidably connected to the U-shaped heating tube 7. The stabilizing rod 49 can further ensure the stability of the upward and downward movement of the positioning ring 48.

[0040] The top of the scraping hole of the positioning ring 48 is connected to the bottom of multiple high-temperature hoses 481, and the top of the high-temperature hoses 481 is connected to the scraping ring 482. The high-temperature hoses 481 on the positioning ring 48 rise and fall, thereby driving the scraping ring 482 to rise and fall, thereby scraping off the scale on the outer wall of the U-shaped heating tube 7. At the same time, the curved part of the U-shaped heating tube 7 will pass through the bending of the high-temperature hose 481, and thus be scraped off by the scraping ring 482, thereby scraping off the scale on the surface of the U-shaped heating tube 7 in a more curved manner, so that the thermal conductivity of the U-shaped heating tube 7 will not decrease with the increase of scale.

[0041] The inner ring of the first gear 45 is connected to one end of the rotating rod 44, and the rotating rod 44 passes through the water tank 2, the heat conducting plate 31, the annular cover 32 and is rotatably connected to the top of the inner wall of the wheel cover 441. The outer ring of the other end of the rotating rod 44 is fixedly connected to one end of the blades arranged at equal distances, and the edge of the blade contacts the inner wall of the wheel cover 441. The wheel cover 441 is connected to one end of the second steam pipe 43, and the other end of the second steam pipe 43 is connected to one end of the steam valve 42. The other end of the steam valve 42 is connected to one end of the first steam pipe 41, and the other end of the first steam pipe 41 is connected to the upper end of the main insulation shell 1. Through the contact between water and air, a large amount of water vapor is formed in the main insulation shell 1. After the water flows into the bottom of the main insulation shell 1, the water vapor is pressurized and rises into the first steam pipe 41. The steam valve 42 opens, and causes the blades in the wheel cover 441 to rotate through the first steam pipe 41, thereby driving the rotating rod 44, and the rotating rod 44 drives the first gear 45.

[0042] A filter tank 9 is set in the pipeline between the main insulation shell 1 and the three-way valve 6. The upper end of the filter tank 9 is connected to the main insulation shell 1, and the lower end of the filter tank 9 is connected to the three-way valve 6. The scale cleaned from the outer wall of the U-shaped heating tube 7 enters the filter tank 9 for filtration, so that personnel can complete the removal of scale by regularly cleaning the filter tank 9 to prevent scale from affecting the heat conduction between water.

[0043] An opening valve 21 is provided in the water tank 2 and communicates with the flow equalizer 8. The flow equalizer 8 includes a water collecting shell 82 at the lower end of a cover plate 81. The water collecting shell 82 has guide holes equidistantly arranged in a circular pattern. The guide holes are connected to the middle position of the outer circle of the conduit 83. The lower end of the conduit 83 corresponds to the upper end of the U-shaped heating tube 7. The lower end of the conduit 83 has an arc-shaped opening 833, which corresponds to the upper end of the U-shaped heating tube 7. Water is heated by the heat conducting plate 31 and enters the water tank 2. The opening valve 21 is opened, and the water in the water tank 2 is introduced into the water collecting shell 82. As the water injection level gradually rises above the conduit 83, the water evenly enters the arc-shaped opening 833 at the lower end of each conduit 83 and flows into the upper end of the U-shaped heating tube 7 through the conduit 83. The water is then heated along the U-shaped heating tube 7, which makes the water temperature rise more rapidly, thereby improving the efficiency of the benzene hydrogenation reaction.

[0044] The working principle and use process of the present invention are as follows: water is heated through the heat conducting plate 31 and enters the water tank 2. The valve 21 is opened to introduce the water in the water tank 2 into the water collecting shell 82. As the water is injected, it gradually rises above the conduit 83. Through the conduit 83, water evenly enters the arc-shaped opening 833 at the lower end of each conduit 83 and flows into the upper end of the U-shaped heating tube 7. The water is then heated along the U-shaped heating tube 7, making the water temperature rise faster. Through the contact between water and air, a large amount of water vapor is formed in the main insulation shell 1. After the water flows into the bottom of the main insulation shell 1, the water vapor is pressurized and rises into the first steam pipe 41 and the steam valve 42. Open, through the first steam pipe 41, the blades in the wheel cover 441 rotate, thereby driving the rotating rod 44, the rotating rod 44 drives the first gear 45, the second gear 46 and the reciprocating screw 47, the rotation of the reciprocating screw 47 causes the positioning ring 48 to move up and down, the high-temperature hose 481 on the positioning ring 48 rises, thereby driving the scraper ring 482 to rise, thereby scraping the scale off the outer wall of the U-shaped heating tube 7, and at the same time, the curved part of the U-shaped heating tube 7 will pass through the bending of the high-temperature hose 481, thereby being scraped off by the scraper ring 482. When the water in the main insulation shell 1 is full, the steam valve 42 is closed and the opening valve 21 is closed.

[0045] After the reaction heating of benzene and hydrogen in the internal reaction box 11 is completed, the steam valve 42 is opened, and the three-way valve 6 switches the water pump 5 to connect with the main insulation shell 1. Water can be pumped out of the main insulation shell 1 through the water pump 5. At the same time, the scale cleaned off the outer wall of the heating tube enters the filter tank 9 for filtration, thereby pumping out water without scale and entering the guide pipe 51. The water in the guide pipe 51 is drained through the oblique hole 35, causing the scraper 33 to rotate to clean the scale in the heat conduction plate 31 and the annular cover 32, thereby ensuring the thermal conductivity of the heat conduction plate 31, and finally refluxes into the water tank 2 through the through hole connected to the water tank 2. At the same time, after the water in the main insulation shell 1 is pumped out, the three-way valve 6 switches the water pump 5 to connect with the water tank 2, so that the heat conduction plate 31 heats and keeps the water in the water tank 2 warm.

[0046] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A preheating device for benzene hydrogenation production, comprising a main body insulation shell (1), characterized in that: An internal reaction box (11) is arranged inside the main body insulation shell (1); a plurality of U-shaped heating tubes (7) are arranged in a circular shape and at equal intervals between the internal reaction box (11) and the main body insulation shell (1); the U-shaped heating tubes (7) are slidably connected to the descaling structure (4) in the furnace; a water tank (2) is arranged at the upper end of the main body insulation shell (1); the upper end of the water tank (2) is connected to the heat-conducting descaling structure (3); the water tank (2) is connected to a water pump (5); and the water pump (5) is connected to the main body insulation shell (1); The in-furnace descaling structure (4) comprises a first gear (45), the first gear (45) meshes with a symmetrically arranged second gear (46), the bottom of the second gear (46) is connected to one end of a reciprocating screw (47), the other end of the reciprocating screw (47) is rotatably connected to a limiting ring (71) at the lower end of a U-shaped heating tube (7), the limiting ring (71) is connected to the bottom of the main heat-insulating shell (1), and the reciprocating screw (47) is threadedly connected to a positioning ring (48); The heat conduction and descaling structure (3) comprises a heat conduction plate (31), the outer ring of the heat conduction plate (31) is connected to an annular cover (32), a rotating bearing (34) is arranged at a middle position inside the annular cover (32), the inner ring of the rotating bearing (34) is connected to the outer ring of a rotating rod (44), a plurality of scrapers (33) are arranged in an annular shape and equidistantly on the outer ring of the rotating bearing (34), the scrapers (33) are in contact with the bottom of the heat conduction plate (31) and the inner wall of the annular cover (32), the annular cover (32) is provided with an oblique hole (35), and the oblique hole (35) is connected to a flow guide pipe (51).

2. A preheating device for production of benzene hydrogenation device according to claim 1, characterized in that: The positioning ring (48) is symmetrically provided with perforations, the perforations are slidably connected to the stabilizing rod (49), the two ends of the stabilizing rod (49) are connected to the inner wall of the main insulation shell (1) and the limiting ring (71), the positioning ring (48) is provided with scraping holes, and the scraping holes are slidably connected to the U-shaped heating tube (7).

3. A preheating device for production of benzene hydrogenation device according to claim 2, characterized in that: The top of the scraping hole of the positioning ring (48) is connected to the bottom of a plurality of high-temperature hoses (481), and the top of the high-temperature hoses (481) is connected to the scraping ring (482).

4. A preheating device for production of benzene hydrogenation device according to claim 1, characterized in that: The inner ring of the first gear (45) is connected to one end of the rotating rod (44), and the rotating rod (44) passes through the water tank (2), the heat conduction plate (31), the annular cover (32) and is rotatably connected to the top of the inner wall of the wheel cover (441). The outer ring of the other end of the rotating rod (44) is fixedly connected to one end of blades arranged at equal intervals, and the edge of the blade is in contact with the inner wall of the wheel cover (441). The wheel cover (441) is connected to one end of the second steam pipe (43), and the other end of the second steam pipe (43) is connected to one end of the steam valve (42). The other end of the steam valve (42) is connected to one end of the first steam pipe (41), and the other end of the first steam pipe (41) is connected to the upper end of the main body insulation shell (1).

5. A preheating device for benzene hydrogenation production according to claim 1, characterized in that: One end of the water pump (5) is connected to a three-way valve (6), and the other two ends of the three-way valve (6) are connected to the water tank (2) and the main body insulation shell (1) through pipelines.

6. A preheating device for production of benzene hydrogenation device according to claim 5, characterized in that: A filter tank (9) is provided in the pipeline between the main body insulation shell (1) and the three-way valve (6); the upper end of the filter tank (9) is connected to the main body insulation shell (1), and the lower end of the filter tank (9) is connected to the three-way valve (6).

7. A preheating device for production of benzene hydrogenation device according to claim 5, characterized in that: An opening valve (21) is arranged in the water tank (2), and the opening valve (21) is connected to the flow equalizing device (8). The flow equalizing device (8) comprises a water collecting shell (82) arranged at the lower end of the cover plate (81), and the water collecting shell (82) is provided with guide holes in an annular shape and at equal intervals, and the guide holes are connected to the middle position of the outer circle of the guide tube (83), and the lower end of the guide tube (83) corresponds to the upper end of the U-shaped heating tube (7).

8. A preheating device for production of benzene hydrogenation device according to claim 7, characterized in that: The lower end of the conduit (83) is provided with an arc-shaped opening (833), and the arc-shaped opening (833) corresponds to the upper end of the U-shaped heating tube (7).

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