Methylamine condenser energy-saving system for producing urea

Abstract

The invention provides a methylamine condenser energy-saving system for producing urea, and belongs to the technical field of chemical equipment, the methylamine condenser energy-saving system for producing urea comprises a condensation tank and a condensation structure, the condensation tank comprises a tank body, an inlet distributor, a tube plate, a partition plate, a first baffle plate and a second baffle plate, the inlet distributor and the tube plate are located at the bottom end and the top end in the tank body respectively, the partition plate, the first baffle plate and the second baffle plate are located in the tank body, the partition plate is fixedly installed in the middle of the tank body, and the first baffle plate and the second baffle plate are located below and above the partition plate respectively. The multiple first baffle plates and the multiple second baffle plates are evenly distributed in the vertical direction, air holes are formed in the partition plate, liquid phase channels are formed between the multiple first baffle plates and the inner wall of the tank body and between the multiple second baffle plates and the inner wall of the tank body and used for baffling liquid, multiple gas phase channels are formed in the multiple first baffle plates, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, and in particular relates to an energy-saving system for a methylammonium condenser used for producing urea. Background Art

[0002] The methylammonium condenser is one of the key equipment in the urea production process. In the urea production process, the synthetic reaction liquid that is washed and recovered usually enters the high-pressure scrubber for reaction to synthesize methylammonium liquid. During the process, it is heated by steam. The methylammonium liquid from the high-pressure scrubber and the mixed gas of CO2, NH3 and H2O from the stripping tower and the urea synthesis tower enter the high-pressure methylammonium condenser together. These gas and liquid mixtures will undergo a synthetic reaction to produce urea methylammonium solution. The reaction will release a large amount of heat. Since the reaction is a reversible reaction, if the heat is not discharged in time, it will affect the reaction. At the same time, part of the urea methylammonium solution will be evaporated into gas by the heat generated by the reaction and discharged during the reaction. These gases need to be recovered.

[0003] A high-pressure methylammonium condenser is disclosed in a Chinese patent with publication number CN118856941A, comprising: a shell and a tube bundle and internal parts inside the shell; a methylammonium liquid inlet and a CO2 gas inlet are arranged at the bottom of the shell, and a reaction liquid outlet and a gas outlet are arranged at the top; the heat exchange tube bundle is a U-shaped tube structure, and the heat transfer medium takes away the heat generated by the hydrolysis of methylammonium through the heat exchange tube bundle; the internal parts include a high-efficiency tower plate; and the downcomer is supported by the high-efficiency tower plate.

[0004] The existing ammonium methylate condenser directly extends the condenser tube into the reaction liquid to condense the reaction liquid. However, during the reaction, part of the urea ammonium methylate solution will be evaporated into gas by the heat generated by the reaction. The gas cannot be condensed into liquid by the ammonium methylate condenser and will be discharged from the reactor into a high-pressure scrubber for washing and recovery. The reaction will be repeated, resulting in energy waste and reducing the synthesis efficiency of the urea ammonium methylate solution. Summary of the invention

[0005] The object of the present invention is to provide an energy-saving system for a methylammonium condenser for producing urea, aiming to solve the problem in the prior art that part of the urea methylammonium solution in the methylammonium condenser will be evaporated into gas by the heat generated by the reaction, and the gas cannot be condensed into liquid by the methylammonium condenser.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a methylammonium condenser energy-saving system for producing urea, comprising a condensing tank and a condensing structure, the condensing tank comprising a tank body, an inlet distributor and a tube sheet respectively located at the bottom and top of the tank body, a partition located inside the tank body, a first baffle and a second baffle, the partition being fixedly installed in the middle of the tank body, the first baffle and the second baffle being respectively located below and above the partition, there being a plurality of first baffles and a plurality of second baffles and being evenly distributed in the up and down directions, air holes being opened on the partition, a plurality of first baffles and a plurality of second baffles being each provided with a liquid phase channel between the plurality of first baffles and the inner wall of the tank body for bafflement of the liquid, and a plurality of gas phase channels being opened on the plurality of first baffles.

[0007] The condensation structure includes a lifting plate located above the tube sheet, a U-shaped condenser tube extending in the vertical direction, a liquid vibrating assembly located inside the U-shaped condenser tube, and a driving assembly for driving the lifting plate to lift and lower. One end of the U-shaped condenser tube is slidably sleeved on the tube sheet in the up and down directions, and the other end of the U-shaped condenser tube is fixedly installed on the lifting plate after sliding through the tube sheet. The U-shaped condenser tube slides through the partition, the first baffle and the second baffle in the up and down directions. There are multiple U-shaped condenser tubes that are evenly distributed in the tank body.

[0008] The liquid vibration assembly includes a fixed rod that is sleeved in the U-shaped condenser tube along the up and down directions and a liquid vibration mechanism that is sleeved on the outer wall of the fixed rod. There are multiple liquid vibration mechanisms that are evenly distributed along the axial direction of the fixed rod. The top end of the fixed rod slides through the lifting plate and is fixedly connected to the top wall of the tank body.

[0009] The liquid vibrating mechanism includes a sealing sleeve slidably sleeved on the outer wall of the fixed rod, a guide hole extending along the axial direction of the fixed rod is opened inside the sealing sleeve, a piston sleeve slidably sleeved on the outer wall of the fixed rod is slidably installed in the guide hole, the outer wall of the piston sleeve abuts against the inner wall of the guide hole, an elastic member sleeved on the outer wall of the fixed rod is installed between the bottom of the piston sleeve and the bottom of the guide hole, a water inlet connected to the top of the guide hole is opened in the middle of the top of the sealing sleeve, a connecting groove is opened in the middle of the side wall of the guide hole, a water outlet connected to the bottom of the guide hole is opened at the edge of the bottom wall of the sealing sleeve, and there are multiple connecting grooves and water outlets, which are evenly distributed along the circumferential direction of the sealing sleeve.

[0010] A steam outlet is provided in the middle of the top of the tank body, and the driving assembly includes transmission plates fixedly installed on both sides of the top of the lifting plate and a steam turbine installed on the steam outlet. The tops of the two transmission plates slide through the top wall of the tank body, and transmission grooves are opened on the tops of the two transmission plates on one side close to the steam turbine. Transmission shafts are rotatably installed on the two side walls of the steam turbine close to the two transmission plates. One end of the transmission shaft is transmission-connected to the output shaft of the steam turbine, and the other end of the transmission shaft extends into the transmission groove and is fixedly installed with a cam. A limit sleeve is provided at the bottom of the piston sleeve and is fixedly sleeved on the outer wall of the fixed rod.

[0011] The effect is that, by setting up a liquid vibration mechanism, the cooling water between two adjacent liquid vibration mechanisms can be vibrated, so that the cooling water at the center of the U-shaped condenser tube is mixed with the cooling water at the inner wall of the U-shaped condenser tube, and then all the cooling water in the U-shaped condenser tube can be evenly heat exchanged with the outside world, thereby improving the heat exchange efficiency and accelerating the speed at which the cooling water is evaporated into water vapor.

[0012] A leakage groove is provided between one side of the partition and the inner wall of the tank body. The leakage groove and the liquid phase channel on one of the second baffles close to the partition are located on the same side. A baffle is fixedly installed on the top of the leakage groove, and the top of the baffle is inclined toward the center of the tank body.

[0013] The effect is that the cooled liquid can be discharged back to the bottom of the partition plate and discharged through the drain pipe.

[0014] Material inlet pipes are fixedly installed on both sides of the bottom of the outer wall of the tank body, a drain pipe is fixedly installed in the middle of the outer wall of the tank body, the drain pipe is located below the partition, a coolant inlet pipe located between the tube plate and the lifting plate is fixedly installed on the top of the outer wall of the tank body, a gas exhaust pipe is fixedly installed on the tube plate, the bottom end of the gas exhaust pipe passes through the tube plate, the top end of the gas exhaust pipe passes through the lifting plate and the top wall of the tank body and is slidably connected to the lifting plate.

[0015] The top of the partition is fixedly installed with a heat-insulating sleeve which is slidably sleeved on the outer wall of one end of the U-shaped condensing pipe connected with the lifting plate.

[0016] The effect is that, by providing the heat-insulating sleeve, heat exchange between the water vapor in the U-shaped condenser tube and the cooling water is avoided, thereby condensing the water vapor into liquid water.

[0017] Compared with the prior art, the present invention has the following beneficial effects: By setting up a liquid vibration mechanism, the cooling water between two adjacent liquid vibration mechanisms can be vibrated, so that the cooling water at the center of the U-shaped condenser tube is mixed with the cooling water at the inner wall of the U-shaped condenser tube, and then all the cooling water in the U-shaped condenser tube can be evenly heat exchanged with the outside, thereby improving the heat exchange efficiency and accelerating the speed at which the cooling water is evaporated into water vapor. At the same time, as the U-shaped condenser tube rises and falls, the baffle can scrape off the condensed droplets adhered to the outer wall of the U-shaped condenser tube to prevent the droplets from affecting the heat exchange, thereby improving the heat exchange efficiency of the cooling water.

[0018] By providing the partition 12, heat exchange can be performed on the gas in the cavity between the partition 12 and the tube sheet 13, so that the methylamine gas evaporated by the heat generated by the reaction is recondensed into liquid, avoiding the exhaust gas from carrying too much heat, thereby improving the utilization rate of the heat generated by the reaction and improving the energy-saving effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the condenser in the present invention; Figure 2 It is a schematic cross-sectional view of the condenser in the present invention; Figure 3 It is a structural schematic diagram of the condensation component in the present invention; Figure 4 It is a structural schematic diagram of the lifting assembly in the present invention; Figure 5 It is a structural schematic diagram of the condenser in the present invention; Figure 6 It is a schematic diagram of the structure of the liquid vibrating component in the present invention.

[0020] In the figure: 1. condenser; 10. tank body; 101. steam outlet; 11. inlet distributor; 111. distribution hole; 12. partition; 121. leakage groove; 122. baffle; 123. air hole; 13. tube sheet; 14. first baffle; 141. gas phase channel; 15. second baffle; 16. material inlet pipe; 17. drain pipe; 18. coolant inlet pipe; 19. gas discharge pipe; 2. base; 3. condensation structure ; 31. lifting plate; 32. U-shaped condenser; 321. insulation sleeve; 33. vibrating liquid assembly; 331. fixing rod; 332. sealing sleeve; 333. piston sleeve; 3321. guide hole; 3322. water inlet; 3323. connecting groove; 3324. water outlet; 334. elastic part; 335. limit sleeve; 34. transmission plate; 341. transmission groove; 35. steam turbine; 36. transmission shaft; 37. cam. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 6 The present invention provides the following technical solution: a methylammonium condenser energy-saving system for producing urea, comprising a condensation tank 1, a base 2 located at the bottom of the condensation tank 1 to support it, and a condensation structure 3.

[0023] refer to Figure 1 and Figure 2As shown, the condensation tank 1 includes a tank body 10, an inlet distributor 11, a partition 12, a tube sheet 13, a first baffle 14, a second baffle 15, a material inlet pipe 16, a discharge pipe 17, a coolant inlet pipe 18 and a gas discharge pipe 19.

[0024] A steam outlet 101 is provided at the middle of the top end of the tank body 10 .

[0025] The inlet distributor 11 is fixedly installed at the bottom end of the tank body 10 , and a plurality of distribution holes 111 are formed on the inlet distributor 11 .

[0026] The partition 12 is fixedly installed in the middle of the tank body 10, and a leakage groove 121 is provided between one side of the partition 12 and the inner wall of the tank body 10. A baffle 122 is fixedly installed on the top of the leakage groove 121, and the top of the baffle 122 is inclined toward the center of the tank body 10. An air hole 123 is opened on the partition 12.

[0027] The tube sheet 13 is fixedly mounted on the top of the tank body 10 .

[0028] The first baffle 14 and the second baffle 15 are respectively located below and above the partition 12. There are multiple first baffles 14 and second baffles 15 and they are evenly distributed in the up and down directions. Liquid phase channels are provided between the multiple first baffles 14 and the multiple second baffles 15 and the inner wall of the tank body 10 for baffle the liquid. Multiple gas phase channels 141 are opened on the multiple first baffles 14, and the liquid phase channel on one of the second baffles 15 close to the partition 12 is located on the same side as the leakage groove 121.

[0029] There are two material inlet pipes 16 fixedly installed on both sides of the bottom of the outer wall of the tank body 10 and located below the inlet distributor 11. The two material inlet pipes 16 are both connected to the interior of the tank body 10. The two material inlet pipes 16 are respectively used to allow the methylammonium liquid from the high-pressure scrubber and the mixed gas of CO2, NH3 and H2O from the stripping tower and the urea synthesis tower to enter the interior of the tank body 10.

[0030] The drain pipe 17 is fixedly installed in the middle of the outer wall of the tank body 10 and is located below the partition 12. The drain pipe 17 is an L-shaped pipe, and the axis of the pipe mouth located outside the tank body 10 extends horizontally, and the axis of the pipe mouth located inside the tank body 10 extends horizontally upward, which is used to facilitate the discharge of urea methylamine after the reaction.

[0031] The coolant inlet pipe 18 is fixedly mounted on the top of the outer wall of the tank body 10 and is located between the tube plate 13 and the lifting plate 31 .

[0032] The gas exhaust pipe 19 is fixedly mounted on the tube sheet 13, the bottom end of the gas exhaust pipe 19 penetrates the tube sheet 13, the top end of the gas exhaust pipe 19 penetrates the lifting plate 31 and the top wall of the tank body 10 and is slidably connected to the lifting plate 31, so as to discharge the gas that has not participated in the reaction after the reaction is completed.

[0033] refer to Figure 2-Figure 6 As shown, the condensation structure 3 includes a lifting plate 31 located above the tube plate 13, a U-shaped condenser tube 32 extending in the vertical direction, a liquid vibrating assembly 33 located inside the U-shaped condenser tube 32, and a driving assembly for driving the lifting plate 31 to rise and fall.

[0034] refer to Figure 2 and Figure 3 As shown, one end of the U-shaped condenser 32 is slidably sleeved on the tube plate 13 along the up and down direction, and the other end of the U-shaped condenser 32 slides through the tube plate 13 and is fixedly installed on the lifting plate 31. The U-shaped condenser 32 slides through the partition 12, the first baffle 14 and the second baffle 15 along the up and down direction. There are multiple U-shaped condenser tubes 32 and they are evenly distributed in the tank body 10. The top of the partition 12 is fixedly installed with an insulation sleeve 321 that is slidably sleeved on the outer wall of one end of the U-shaped condenser tube 32 connected to the lifting plate 31.

[0035] refer to Figure 5 and Figure 6 As shown, the liquid vibrating assembly 33 includes a fixing rod 331 sleeved in the U-shaped condenser tube 32 along the up-down direction and a liquid vibrating mechanism sleeved on the outer wall of the fixing rod 331 .

[0036] The top end of the fixing rod 331 slides through the lifting plate 31 and is fixedly connected to the top wall of the tank body 10 .

[0037] There are multiple liquid vibrating mechanisms and they are evenly distributed along the axis direction of the fixed rod 331. The liquid vibrating mechanism includes a sealing sleeve 332 that is slidably sleeved on the outer wall of the fixed rod 331. The outer wall of the sealing sleeve 332 conflicts with the interior of the U-shaped condenser tube 32. The interior of the sealing sleeve 332 is provided with a guide hole 3321 extending along the axis direction of the fixed rod 331. A piston sleeve 333 that is slidably sleeved on the outer wall of the fixed rod 331 is slidably installed in the guide hole 3321. The outer wall of the piston sleeve 333 conflicts with the inner wall of the guide hole 3321. The bottom of the piston sleeve 333 conflicts with the bottom of the guide hole 3321. An elastic member 334 is installed between the parts and is sleeved on the outer wall of the fixing rod 331. A water inlet 3322 connected to the top of the guide hole 3321 is provided in the middle of the top of the sealing sleeve 332. A connecting groove 3323 is provided in the middle of the side wall of the guide hole 3321. A water outlet 3324 connected to the bottom of the guide hole 3321 is provided at the edge of the bottom wall of the sealing sleeve 332. There are multiple connecting grooves 3323 and water outlets 3324 and they are evenly distributed along the circumferential direction of the sealing sleeve 332. A limiting sleeve 335 fixedly sleeved on the outer wall of the fixing rod 331 is provided at the bottom of the piston sleeve 333.

[0038] refer to Figure 2 and Figure 4As shown, the driving assembly includes a transmission plate 34 fixedly mounted on both sides of the top of the lifting plate 31 and a steam turbine 35 mounted on the steam outlet 101 .

[0039] The tops of the two transmission plates 34 are slidably passed through the top wall of the tank body 10 , and transmission grooves 341 are formed on the tops of the two transmission plates 34 on one side close to the steam turbine 35 .

[0040] A transmission shaft 36 is rotatably mounted on both side walls of the steam turbine 35 close to the two transmission plates 34 , one end of the transmission shaft 36 is transmission-connected to the output shaft of the steam turbine 35 , and the other end of the transmission shaft 36 extends into the transmission groove 341 and is fixedly mounted with a cam 37 .

[0041] The implementation principle of the embodiment of the present invention is: during condensation, the methylammonium liquid from the high-pressure scrubber and the mixed gas of CO2, NH3 and H2O from the stripping tower and the urea synthesis tower are respectively discharged into the inner bottom of the tank body 10 through two material inlet pipes 16, and the methylammonium liquid and the mixed gas are evenly distributed through the inlet distributor 11 and enter between the inlet distributor 11 and the partition 12. At this time, the methylammonium liquid is baffled and rises under the action of the first baffle 14, and the mixed gas rises along the gas phase channel 141 on the first baffle 14. At this time, the methylammonium liquid and the mixed gas react to generate methylammonium, and part of the methylammonium is hydrolyzed to generate urea. The urea methylammonium solution generated by the final reaction flows out from the drain pipe 17. At the same time, the reaction will release a large amount of heat. During the reaction, part of the urea methylammonium solution will be evaporated into gas by the heat generated by the reaction. The gas and the gas that did not participate in the reaction enter the cavity between the partition 12 and the tube sheet 13 through the pores 123 on the partition 12, and are baffled and risen by the second baffle 15.

[0042] At the same time, cooling water is discharged into the inner top of the tank body 10 through the cooling liquid inlet pipe 18, and the cooling water enters the U-shaped condenser 32 from the pipe mouth of the U-shaped condenser 32 located on the tube plate 13. At this time, the cooling water exchanges heat with the gas-liquid mixed reactants under the partition 12 through the U-shaped condenser 32, takes away the heat generated by the reaction, and avoids the heat affecting the reaction. At the same time, the amount of urea methylammonium solution evaporated into gas is reduced. The cooling water also exchanges heat with the gas in the cavity between the partition 12 and the tube plate 13, so that the methylamine gas evaporated by the heat generated by the reaction is re-condensed into liquid, and through the action of the second deflector 15 and the baffle 122, it re-enters the bottom of the partition 12 through the leakage groove 121 and is discharged through the drain pipe 17. At this time, the cooling water is evaporated into water vapor after heat exchange on both sides, and is discharged to the steam outlet 101 through the other pipe mouth of the U-shaped condenser 32.

[0043] The water vapor enters the steam turbine 35 through the steam outlet 101, and drives the output shaft of the steam turbine 35 to rotate. Then the water vapor is discharged from the steam turbine 35 and enters the high-pressure scrubber to heat the reaction of the synthetic reaction liquid. The output shaft of the steam turbine 35 drives the two transmission shafts 36 to rotate. The transmission shaft 36 drives the cam 37 to rotate. The rotation of the cam 37 drives the transmission plate 34 and the lifting plate 31 to perform reciprocating lifting and lowering motions. At this time, the U-shaped condenser 32 follows the lifting plate 31 to rise and fall synchronously. Since the outer wall of the sealing sleeve 332 conflicts with the inside of the U-shaped condenser 32, as the U-shaped condenser 32 rises, the sealing sleeve 332 rises synchronously under the action of the friction between the sealing sleeve 332 and the U-shaped condenser 32. At this time, the piston sleeve 333 is under the action of the cooling water. Under the use, the sealing sleeve 332 descends and compresses the elastic member 334. As the sealing sleeve 332 descends, the lowest point of the sealing sleeve 332 is lower than the bottom of the connecting groove 3323, so that the cooling water cannot enter the bottom of the piston sleeve 333 through the connecting groove 3323, thereby making the two adjacent liquid-vibrating mechanisms relatively closed and the cooling water cannot be replenished. Therefore, as the U-shaped condenser 32 rises, the cooling water between the two adjacent liquid-vibrating mechanisms is vibrated, so that the cooling water at the center of the U-shaped condenser 32 is mixed with the cooling water at the inner wall of the U-shaped condenser 32, so that all the cooling water in the U-shaped condenser 32 can be evenly heat exchanged with the outside, thereby improving the heat exchange efficiency and accelerating the speed at which the cooling water is evaporated into water vapor.

[0044] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A methylammonium condenser energy-saving system for producing urea, comprising a condensing tank (1) and a condensing structure (3), wherein the condensing tank (1) comprises a tank body (10) and an inlet distributor (11) and a tube sheet (13) respectively located at the bottom and top of the tank body (10), characterized in that: The condensation tank (1) further comprises a partition (12), a first baffle (14) and a second baffle (15) located inside the tank body (10); the partition (12) is fixedly mounted in the middle of the tank body (10); the first baffle (14) and the second baffle (15) are located below and above the partition (12), respectively; there are a plurality of first baffles (14) and a plurality of second baffles (15) which are evenly distributed in the up-down direction; and air holes (123) are provided on the partition (12); The condensation structure (3) comprises a lifting plate (31) located above the tube plate (13), a U-shaped condenser tube (32) extending in a vertical direction, a liquid vibrating assembly (33) located inside the U-shaped condenser tube (32), and a driving assembly for driving the lifting plate (31) to move up and down. One end of the U-shaped condenser tube (32) is slidably sleeved on the tube plate (13) in an up-down direction, and the other end of the U-shaped condenser tube (32) is slidably penetrated through the tube plate (13) and then fixedly mounted on the lifting plate (31). The U-shaped condenser tube (32) is slidably penetrated through the partition plate (12), the first baffle plate (14), and the second baffle plate (15) in an up-down direction.

2. The methylammonium condenser energy-saving system for producing urea according to claim 2, characterized in that: The liquid vibrating assembly (33) comprises a fixed rod (331) sleeved in the U-shaped condenser tube (32) along the up-down direction and a liquid vibrating mechanism sleeved on the outer wall of the fixed rod (331), wherein the liquid vibrating mechanisms are multiple and evenly distributed along the axial direction of the fixed rod (331), and the top end of the fixed rod (331) slides through the lifting plate (31) and is fixedly connected to the top wall of the tank body (10).

3. The methylammonium condenser energy-saving system for producing urea according to claim 2, characterized in that: The liquid vibrating mechanism comprises a sealing sleeve (332) slidably sleeved on the outer wall of the fixed rod (331); a flow guide hole (3321) extending along the axial direction of the fixed rod (331) is provided inside the sealing sleeve (332); a piston sleeve (333) slidably sleeved on the outer wall of the fixed rod (331) is slidably installed in the flow guide hole (3321); the outer wall of the piston sleeve (333) abuts against the inner wall of the flow guide hole (3321); An elastic member (334) sleeved on the outer wall of the fixing rod (331) is installed between the bottom and the bottom of the guide hole (3321); a water inlet (3322) connected to the top of the guide hole (3321) is provided in the middle of the top of the sealing sleeve (332); a connecting groove (3323) is provided in the middle of the side wall of the guide hole (3321); and a water outlet (3324) connected to the bottom of the guide hole (3321) is provided at the edge of the bottom wall of the sealing sleeve (332).

4. The methylammonium condenser energy-saving system for producing urea according to claim 3, characterized in that: There are multiple communicating grooves (3323) and water outlets (3324), and they are evenly distributed along the circumferential direction of the sealing sleeve (332).

5. The methylammonium condenser energy-saving system for producing urea according to claim 1, characterized in that: A steam outlet (101) is provided at the middle of the top of the tank body (10). The driving assembly comprises transmission plates (34) fixedly mounted on both sides of the top of the lifting plate (31) and a steam turbine (35) mounted on the steam outlet (101). The tops of the two transmission plates (34) slide through the top wall of the tank body (10). The tops of the two transmission plates (34) on one side close to the steam turbine (35) are provided with transmission grooves (341). A transmission shaft (36) is rotatably mounted on two side walls of the steam turbine (35) close to the two transmission plates (34). One end of the transmission shaft (36) is transmission-connected to an output shaft of the steam turbine (35). The other end of the transmission shaft (36) extends into the transmission groove (341) and is fixedly mounted with a cam (37). The bottom of the piston sleeve (333) is provided with a limit sleeve (335) fixedly sleeved on the outer wall of the fixing rod (331).

6. The methylammonium condenser energy-saving system for producing urea according to claim 1, characterized in that: There are a plurality of U-shaped condensing tubes (32) which are evenly distributed in the tank body (10).

7. The methylammonium condenser energy-saving system for producing urea according to claim 1, characterized in that: Liquid phase channels are provided between the plurality of first baffles (14) and the plurality of second baffles (15) and the inner wall of the tank body (10) for baffle liquid, and a plurality of gas phase channels (141) are provided on the plurality of first baffles (14).

8. The methylammonium condenser energy-saving system for producing urea according to claim 7, characterized in that: A liquid leakage groove (121) is provided between one side of the partition (12) and the inner wall of the tank body (10); the liquid leakage groove (121) and a liquid phase channel on one of the second baffles (15) close to the partition (12) are located on the same side; a baffle (122) is fixedly mounted on the top of the liquid leakage groove (121); the top of the baffle (122) is inclined towards the center of the tank body (10).

9. The methylammonium condenser energy-saving system for producing urea according to claim 1, characterized in that: Material inlet pipes (16) are fixedly mounted on both sides of the bottom of the outer wall of the tank body (10), a liquid discharge pipe (17) is fixedly mounted in the middle of the outer wall of the tank body (10), and the liquid discharge pipe (17) is located below the partition (12). A coolant inlet pipe (18) located between the tube sheet (13) and the lifting plate (31) is fixedly mounted on the top of the outer wall of the tank body (10), and a gas discharge pipe (19) is fixedly mounted on the tube sheet (13), the bottom end of the gas discharge pipe (19) passes through the tube sheet (13), and the top end of the gas discharge pipe (19) passes through the lifting plate (31) and the top wall of the tank body (10) and is slidably connected to the lifting plate (31).

10. The methylammonium condenser energy-saving system for producing urea according to claim 1, characterized in that: The top of the partition (12) is fixedly mounted with a heat-insulating sleeve (321) that is slidably sleeved on the outer wall of one end of the U-shaped condenser tube (32) connected to the lifting plate (31).

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