High-pressure methylamine condenser for urea

Abstract

The application belongs to the technical field of urea synthesis equipment, and particularly relates to a high-pressure methylamine condenser for urea. The high-pressure methylamine condenser for urea comprises a spraying absorption assembly and a condenser assembly, the outlet of the spraying absorption assembly is connected with the condenser assembly, an upper end cover is arranged at the inlet of a spraying section to seal the spraying section, a distributor and an absorption component are arranged in the spraying section, a liquid inlet pipe penetrates through the upper end cover and is connected with the distributor, the distributor is arranged at one end adjacent to the upper end cover, and the absorption component is arranged at one end away from the upper end cover. The high-pressure methylamine condenser for urea can reduce the equipment volume and production cost.

Description

Technical Field

[0001] This application belongs to the technical field of urea synthesis equipment, specifically relating to a high-pressure ammonium carbamate condenser for urea. Background Technology

[0002] The high-pressure ammonium carbamate condenser, as a key piece of equipment in urea synthesis, together with the urea synthesis tower, stripping tower, and high-pressure scrubber, constitutes the core technical equipment of the high-pressure urea synthesis process unit.

[0003] In the traditional carbon dioxide stripping process for urea production, the high-pressure ammonium carbamate condenser and the high-pressure scrubber are two separate pieces of equipment, which require separate design and manufacturing and occupy a large area. Utility Model Content

[0004] This utility model is based on the inventor's discovery and understanding of the following facts and problems: This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of this utility model propose a high-pressure ammonium carbamate condenser for urea to reduce equipment size and production costs.

[0006] The high-pressure ammonium carbamate condenser for urea according to this embodiment of the utility model includes: The system includes a spray absorption assembly and a condenser assembly, with the outlet of the spray absorption assembly connected to the condenser assembly. The spray absorption assembly includes an upper cover, a spray section, an inlet pipe, a distributor, and an absorption component. The upper cover is disposed at the inlet of the spray section to seal the spray section. The distributor and the absorption component are disposed within the spray section. The inlet pipe passes through the upper cover and is connected to the distributor. The distributor is disposed at one end adjacent to the upper cover, and the absorption component is disposed at the end away from the upper cover. The spray absorption assembly is provided with an air riser hole that penetrates the distributor along the axial direction of the spray section, and the distributor is provided with a liquid fallr hole that communicates with the spray section. The upper end cover has a vent hole that communicates with the inlet of the spray section, and the radial dimension of the liquid fallr hole is smaller than the radial dimension of the air riser hole.

[0007] The high-pressure methylammonium condenser for urea in this embodiment of the present invention reduces equipment size and production costs.

[0008] In some embodiments, the radial dimension of the downcomer hole is 6mm to 10mm, and the radial dimension of the upcomer hole is 30mm to 60mm.

[0009] In some embodiments, the absorption component and the distributor have a first preset distance A, and 800mm≤A≤1000mm.

[0010] In some embodiments, the absorption component includes a pressure plate, a grid plate, and a packing member. The pressure plate and the grid plate are connected to the inner wall of the spray section, and the top of the packing member is in contact with the pressure plate, and the grid plate is in contact with the bottom of the packing member.

[0011] In some embodiments, the condenser assembly includes: a liquid collecting section, a reaction section, a condensation section, and a mixing section. One end of the reaction section is connected to the liquid collecting section, the other end of the reaction section is connected to the condensation section, and the other end of the condensation section is connected to the mixing section. It also includes a downcomer, a liquid collecting pan, an upper tube sheet, and a riser pipe. The liquid collecting pan is located at the outlet of the liquid collecting section, and the upper tube sheet is located at the outlet of the reaction section to separate the reaction section and the condensation section. A reaction chamber is formed between the upper tube sheet and the liquid collecting pan, and the liquid collecting pan forms a liquid collecting chamber. The riser pipe is located at the top of the liquid collecting pan and is used to connect a spray section and the reaction section. The liquid collecting pan has a liquid collecting port for collecting liquid on the liquid collecting pan. The inlet of the downcomer pipe is connected to the liquid collecting port, and the downcomer pipe passes through the reaction section, the condensation section, and is connected to the mixing section.

[0012] In some embodiments, the condenser assembly further includes a cap and a connector, one end of the connector being connected to the cap and the other end of the connector being connected to the riser pipe, one end of the riser pipe extending into the cap, and a second preset distance B being between the outer wall of the riser pipe and the inner wall of the cap, wherein 50mm≤B≤100mm.

[0013] In some embodiments, the condenser assembly further includes: a heat exchange tube and a lower tube sheet, the lower tube sheet being disposed at the bottom of the condensation section, a heat exchange cavity being formed between the upper tube sheet and the lower tube sheet, the downcomer inlet passing through the heat exchange cavity and connected to the mixing section, and the heat exchange tube passing through the lower tube sheet and connected to the reaction tube section.

[0014] In some embodiments, the condenser assembly further includes an overflow pipe that passes through the reaction section and is connected to the reaction chamber; Multiple baffle trays are arranged within the reaction section, the multiple baffle trays are connected to the inner wall of the reaction section and are spaced apart in the axial direction of the reaction section, the baffle trays have liquid risers, and the liquid risers on adjacent baffle trays are arranged relatively spaced apart in the radial direction of the reaction section.

[0015] In some embodiments, there are multiple heat exchange tubes, which are arranged at intervals along the axial direction of the condenser tube. In some embodiments, the spraying section, liquid collection section, reaction section, condensation section, and mixing section are integrally formed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the spray absorption section, liquid collection section, and reaction section of an embodiment of this utility model.

[0017] Figure 2 This is a schematic diagram of the condensation section and the mixing section of an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the riser pipe according to an embodiment of the present invention.

[0019] Figure 4 This is a top view of the liquid collection tray according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the baffle tray of an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of a high-pressure ammonium carbamate condenser for urea according to an embodiment of this utility model.

[0022] Figure label: Spray absorption assembly 1, upper end cover 11, vent 111, spray section 12 Inlet pipe 13, Distributor 14, downcomer 141, vent 142, Absorbing component 15, pressure plate 151, grid plate 152, packing component 153 Condenser assembly 2, liquid collecting section 21, liquid inlet 211, steam outlet 212, condensing section 22, mixing section 23, first port 231, second port 232, third port 233, downcomer 24, liquid collecting tray 25, liquid collecting port 251, upper tube sheet 26, riser pipe 27, pipe cap 28, connector 29, overflow pipe 210, baffle tray 220, riser port 2201, heat exchange tube 230, lower tube sheet 240, reaction section 250. Impact protection plate 3. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The high-pressure methylammonium condenser for urea according to this embodiment includes: a spray absorption assembly 1 and a condenser assembly 2. The outlet of the spray absorption assembly 1 is connected to the condenser assembly 2. The spray absorption assembly 1 includes an upper cover 11, a spray section 12, an inlet pipe 13, a distributor 14, and an absorption component 15. The upper cover 11 is disposed at the inlet of the spray section 12 to seal the spray section 12. The distributor 14 and the absorption component 15 are disposed inside the spray section 12. The inlet pipe 13 passes through the upper cover 11 and is connected to the distributor 14. The distributor 14 is disposed at one end adjacent to the upper cover 11, and the absorption component 15 is disposed at the end away from the upper cover 11. The spray absorption assembly 1 is provided with an air riser 142 that passes through the distributor 14 along the axial direction of the spray section 12, and the distributor 14 is provided with a liquid fallr 141 that communicates with the spray section 12. The upper end cover 11 has a vent 111 that communicates with the inlet of the spray section 12, and the radial dimension of the liquid fallr 141 is smaller than the radial dimension of the air riser 142.

[0025] This invention relates to a high-pressure methylammonium condenser for urea. By incorporating a spray absorption assembly 1, the methylammonium liquid entering the condenser is evenly distributed, increasing contact between the rising carbon dioxide and ammonia gas and the falling methylammonium liquid, thus pre-mixing the liquid for subsequent heat exchange reactions. By integrating the spray structure with the methylammonium condenser, the functions of a traditional high-pressure methylammonium condenser and a high-pressure scrubber are combined into one. This not only saves on equipment manufacturing costs but also optimizes the equipment layout, allowing for direct material output from the scrubber to the methylammonium condenser, reducing pipeline investment and the risk of methylammonium liquid leakage. Furthermore, it avoids heat loss, resulting in good economic benefits and reduced equipment size and production costs.

[0026] Specifically, such as Figures 1 to 6 As shown, the upper end of the condenser assembly 2 is connected to the lower end of the spray absorption assembly 1. The upper end cover 11 is installed at the inlet of the top of the spray section 12 to seal the upper inlet of the spray pipe. The lower section of the spray section 12 is connected to the condenser assembly 2. The distributor 14 is positioned above the absorption component 15. Unreacted low-temperature ammonium carbamate solution in the medium-pressure system enters the distributor 14 through the inlet pipe 13. The function of the distributor 14 is twofold: first, to distribute the ammonium carbamate solution evenly into the spray pipe; and second, to provide a gas phase channel for unreacted ammonia and carbon dioxide to enter the medium-pressure system through the gas outlet. For example, the distributor 14 has a downcomer hole 141 at the lower end to output the ammonium carbamate solution. Unreacted ammonia and carbon dioxide pass through the upcomer hole 142, through the distributor 14, and through the vent hole 111 of the upper end cover 11 into the medium-pressure system.

[0027] The radial dimension of the downcomer 141 is smaller than that of the riser 142. This smaller radial dimension effectively controls the liquid's velocity and flow rate, preventing excessive liquid accumulation on the trays, thus reducing residence time, improving liquid distribution uniformity, and facilitating mixing with the gas below the distributor 14. The smaller radial dimension of the downcomer 141 also reduces turbulence in the distributor 14, lowers the pressure drop, and improves the stability of the liquid flow.

[0028] The larger radial dimension of the riser 142 provides a larger gas passage, reduces gas flow resistance, and ensures that the gas can rise smoothly.

[0029] Furthermore, the radial dimension of the downcomer 141 is 6mm~10mm, and the radial dimension of the air riser 142 is 30mm~60mm.

[0030] The riser vent 142 extends from the bottom to the top of the distributor 14, providing a continuous channel for the gas to rise smoothly from the bottom to the top, reducing flow resistance. The downcomer vent 141 is located at the bottom of the distributor 14 to prevent excessive liquid accumulation. The riser vent 142 and the downcomer vent 141 are not connected, preventing mutual interference. Liquid flows downward through the downcomer vent 141, while gas flows upward through the riser vent 142, ensuring they do not interfere with each other and improving equipment operating efficiency.

[0031] In some embodiments, the absorber 15 and the distributor 14 have a first preset distance A, where 800mm ≤ A ≤ 1000mm. By setting the first distance, sufficient time and space are ensured for the liquid to be evenly distributed below the distributor 14, so that the ammonium carbamate liquid can be mixed with unreacted carbon dioxide and ammonia before entering the packing, reducing liquid turbulence and uneven distribution, thereby improving mixing efficiency.

[0032] It should be noted that when A exceeds 1000mm, the gap between the distributor 14 and the filler of the absorption component 15 is too large, which leads to an increase in the length of the spray section 12, increasing manufacturing costs and installation difficulty.

[0033] In some embodiments, the absorption component 15 includes a pressure plate 151, a grid plate 152, and a packing member 153. The pressure plate 151 and the grid plate 152 are connected to the inner wall of the spray section 12, and the top of the packing member 153 contacts the pressure plate 151, while the grid plate 152 contacts the bottom of the packing member 153. The pressure plate 151 and the grid plate 152 are disposed at the upper and lower ends of the packing member 153 to limit the packing member 153 and prevent the packing from being blown away.

[0034] In some embodiments, the condenser assembly 2 includes: Liquid collection section 21, reaction section 250; The condensing section 22 and the mixing section 23 are connected at one end to the liquid collection section 21 and at the other end to the mixing section 23. The system includes a downcomer 24, a collection tray 25, an upper tube sheet 26, and a riser 27. The collection tray 25 is located at the outlet of the collection section 21. The upper tube sheet 26 is located at the outlet of the reaction section 250 to separate the reaction section 250 and the condensation section 22. A reaction chamber is formed between the upper tube sheet 26 and the collection tray 25. A collection chamber is formed between the collection tray and the grid plate. The riser 27 is located at the top of the collection tray 25 and is used to connect the spray section 12 and the reaction section 250. The collection tray 25 has a collection port 251 for collecting liquid on the collection tray 25. The inlet of the downcomer 24 is connected to the collection port 251. The downcomer 24 passes through the condensation section 22 and is connected to the mixing section 23.

[0035] Specifically, such as Figures 1 to 6 As shown, the upper end of the liquid collection section 21 is connected to the lower end of the spray section 12, and the lower end of the liquid collection section 21 is connected to the lower end of the reaction section 250. The liquid collection section 21 is equipped with a liquid collection plate 25, a riser pipe 27, a pipe cap 28, a connector 29, and a downcomer 24. The liquid collection plate 25 is located at the lower end of the liquid collection section 21, and the upper tube sheet 26 is located at the lower end of the reaction section 250. The upper tube sheet 26 and the liquid collection plate 25 form a reaction section. The riser pipe 27 is connected vertically, with its upper end extending into and communicating with the spray section 12. The lower end of the riser pipe 27 is connected to the reaction chamber of the reaction section 250 to discharge unreacted carbon dioxide and ammonia from the reaction section 250. The upper end of the condensing section 22 is connected to the lower end of the reaction section 250, and the upper end of the downcomer 24 is connected to the liquid collection plate 25. The liquid collection plate 25 is provided with a liquid collection port 251, which is used to collect the liquid on the upper surface of the liquid collection plate 25, that is, to collect the liquid in the liquid collection chamber. The downcomer 24 passes through the reaction section 250 and the condensing section 22 and is connected to the mixing section 23 to introduce ammonium carbamate solution into the mixing chamber.

[0036] Furthermore, the outlet end of the downcomer 24 is designed with a lateral opening, which can effectively reduce the impact of the bottom process gas on the downcomer of the ammonium methyl hydrate solution. The Z-shaped structure of the downcomer 24 can effectively reduce the impact of temperature difference deformation on the weld. The high-pressure ammonium carbamate condenser for urea in this embodiment incorporates the downcomer 24 internally, which reduces investment in high-pressure pipelines and lowers the risk of ammonium carbamate leakage compared to an external structure.

[0037] In some embodiments, the condenser assembly 2 further includes a cap 28 and a connector 29. One end of the connector 29 is connected to the cap 28, and the other end of the connector 29 is connected to a riser pipe 27. One end of the riser pipe 27 extends into the cap 28, and there is a second preset distance B between the outer wall of the riser pipe 27 and the inner wall of the cap 28, where 50mm≤B≤100mm.

[0038] Specifically, such as Figures 1 to 6 As shown, the cap 28 is positioned at the top of the riser pipe 27 to prevent ammonium carbamate solution from entering the riser pipe 27. A second preset distance exists between the cap 28 and the riser pipe 27 to allow unreacted carbon dioxide and ammonia gas in the reaction section 250 to pass through the second preset distance between the riser pipe 27 and the cap 28 into the spray section 12. Simultaneously, the cap 28, installed at the top of the riser pipe 27, guides the gas flow direction and prevents direct gas impact on the absorption component 15, thus providing a buffering effect.

[0039] By setting a second preset gap, excessive flow resistance of gas between the riser pipe 27 and the cap 28 is avoided due to the gap being less than 50mm, ensuring stable gas flow. A larger gap reduces the accumulation of impurities in the gas between the riser pipe 27 and the cap 28, preventing blockage and improving the operational stability of the equipment.

[0040] In some embodiments, the condenser assembly 2 further includes: a heat exchange tube 230 and a lower tube sheet 240, the lower tube sheet 240 being disposed at the bottom of the condensing section 22, a heat exchange cavity being formed between the upper tube sheet 26 and the lower tube sheet 240, the inlet of the downcomer 24 passing through the heat exchange cavity and connected to the mixing section 23, and the heat exchange tube 230 passing through the lower tube sheet 240 and connected to the mixing section 23.

[0041] Specifically, such as Figures 1 to 6 As shown, the upper end of heat exchange tube 230 passes through the upper tube sheet 26 and is connected to the reaction section 250, and the lower end of heat exchange tube 230 passes through the lower tube sheet 240 and is connected to the mixing section 23. The mixing section 23 is provided with a first port 231, a second port 232 and a third port 233. The first port 231 is suitable for introducing unreacted process gas from the urea synthesis tower, the second port 232 is suitable for introducing process gas from the stripping tower, such as carbon dioxide, ammonia, or water vapor, and the third port 233 is suitable for introducing liquid ammonia from the ammonia heater.

[0042] The upper end of the downcomer 24 collects the liquid, such as ammonium methyl ether liquid, from the collection pan 25, while the lower end of the downcomer 24 outputs the ammonium methyl ether liquid. The ammonium methyl ether liquid mixes with the process gas from the stripping tower and the liquid ammonia from the ammonia heater in the mixing chamber. The mixed fluid is then introduced into the heat exchange tube 230. Since the first port 231, the second port 232, and the third port 233 are all supplying fluid into the mixing chamber, and the downcomer 24 is also supplying fluid, the reaction liquid formed by the mixture of the ammonium methyl ether liquid and the process gas from the stripping tower and the liquid ammonia from the ammonia heater in the mixing chamber is introduced into the heat exchange tube 230. A heat exchange reaction occurs within the heat exchange tube 230, releasing a large amount of heat energy; that is, the reaction produces ammonium methyl ether, releasing a large amount of heat. The condenser tube also has a liquid inlet 211 and a steam outlet 212. The liquid inlet 211 supplies condensate to absorb the heat released by the heat exchange tube 230. The condensate after heat exchange is converted into steam and output from the steam outlet 212.

[0043] Furthermore, anti-impact plates 3 are provided at the first port 231, the second port 232, and the third port to prevent gas from impacting the downcomer and causing the liquid inside the downcomer to fail to descend.

[0044] Furthermore, the condenser assembly 2 also includes an overflow pipe 210, which is connected to the reaction chamber of the reaction section 250. Multiple baffle trays 220 are installed in the reaction section 250. The multiple baffle trays 220 are connected to the inner wall of the liquid collection section 21 and are arranged at intervals in the axial direction of the reaction section 250. Each baffle tray 220 has a liquid riser 2201, and the liquid risers 2201 on adjacent baffle trays 220 are arranged at intervals in the radial direction of the reaction section 250.

[0045] Specifically, such as Figures 1 to 6 As shown, an overflow pipe 210 is installed on the reaction section 250 and above the baffle tray 220. Multiple baffle trays 220 are arranged at intervals in the vertical direction, and the riser ports 2201 on adjacent baffle trays 220 are arranged at intervals in the radial direction of the reaction section 250 to deflect the reaction liquid discharged from the heat exchange tube 230. A small amount of ammonium carbamate undergoes the second step of urea synthesis to produce urea. When the liquid level reaches the top of the overflow pipe 210, a high-pressure injector is connected to the outlet of the overflow pipe 210 to send the ammonium carbamate and a small amount of urea into the synthesis tower for further reaction. By setting multiple baffle trays 220, the degree of liquid turbulence is increased, thereby improving the reaction rate.

[0046] Furthermore, there are multiple heat exchange tubes 230, which are arranged at intervals along the axial direction of the condenser tube to increase the amount of liquid inside the heat exchange tubes 230 and improve the reaction efficiency. Furthermore, the spray section 12, liquid collection section 21, reaction section 250, condensation section 22 and mixing section 23 are integrally molded to improve structural strength, reduce manufacturing costs, and eliminate the need for separate installation.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and 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 utility model.

[0048] 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-pressure ammonium carbamate condenser for urea, characterized in that, include: The system includes a spray absorption assembly and a condenser assembly, with the outlet of the spray absorption assembly connected to the condenser assembly. The spray absorption assembly includes an upper cover, a spray section, an inlet pipe, a distributor, and an absorption component. The upper cover is disposed at the inlet of the spray section to seal the spray section. The distributor and the absorption component are disposed within the spray section. The inlet pipe passes through the upper cover and is connected to the distributor. The distributor is disposed at one end adjacent to the upper cover, and the absorption component is disposed at the end away from the upper cover. The spray absorption assembly is provided with an air riser hole that penetrates the distributor along the axial direction of the spray section, and the distributor is provided with a liquid fallr hole that communicates with the spray section. The upper end cover has a vent hole that communicates with the inlet of the spray section, and the radial dimension of the liquid fallr hole is smaller than the radial dimension of the air riser hole.

2. The high-pressure ammonium carbamate condenser for urea according to claim 1, characterized in that, The radial dimension of the descending orifice is 6mm~10mm, and the radial dimension of the rising orifice is 30mm~60mm.

3. The high-pressure ammonium carbamate condenser for urea according to claim 1, characterized in that, The absorption component and the distributor have a first preset distance A, and 800mm≤A≤1000mm.

4. The high-pressure ammonium carbamate condenser for urea according to claim 1, characterized in that, The absorption component includes a pressure plate, a grid plate, and a packing element. The pressure plate and the grid plate are connected to the inner wall of the spray section, and the top of the packing element is in contact with the pressure plate, while the grid plate is in contact with the bottom of the packing element.

5. The high-pressure methylammonium condenser for urea according to claim 4, characterized in that, The condenser assembly includes: The system comprises a liquid collection section, a reaction section, a condensation section, and a mixing section. One end of the reaction section is connected to the liquid collection section, the other end of the reaction section is connected to the condensation section, and the other end of the condensation section is connected to the mixing section. The system comprises a downcomer, a collection tray, an upper tube sheet, and a riser. The collection tray is located at the outlet of the collection section. The upper tube sheet is located at the outlet of the reaction section to separate the reaction section and the condensation section. A reaction chamber is formed between the upper tube sheet and the collection tray. A collection chamber is formed between the collection tray and the grid plate. The riser is located at the top of the collection tray and is used to connect the spray section and the reaction section. The collection tray has a collection port for collecting liquid on the collection tray. The inlet of the downcomer is connected to the collection port. The downcomer passes through the reaction section, the condensation section, and is connected to the mixing section.

6. The high-pressure methylammonium condenser for urea according to claim 5, characterized in that, The condenser assembly also includes a cap and a connector. One end of the connector is connected to the cap, and the other end of the connector is connected to the riser pipe. One end of the riser pipe extends into the cap, and there is a second preset distance B between the outer wall of the riser pipe and the inner wall of the cap, where 50mm≤B≤100mm.

7. The high-pressure ammonium carbamate condenser for urea according to claim 5 or 6, characterized in that, The condenser assembly further includes: heat exchange tubes and a lower tube sheet, the lower tube sheet being disposed at the bottom of the condensation section, a heat exchange cavity being formed between the upper tube sheet and the lower tube sheet, the downcomer inlet passing through the heat exchange cavity and connected to the mixing section, and the heat exchange tubes passing through the lower tube sheet and connected to the mixing section.

8. The high-pressure methylammonium condenser for urea according to claim 5, characterized in that, The condenser assembly further includes an overflow pipe disposed in the reaction section; Multiple baffle trays are arranged within the reaction section, the multiple baffle trays are connected to the inner wall of the reaction section and are spaced apart in the axial direction of the reaction section, the baffle trays have liquid risers, and the liquid risers on adjacent baffle trays are arranged relatively spaced apart in the radial direction of the reaction section.

9. The high-pressure ammonium carbamate condenser for urea according to claim 7, characterized in that, There are multiple heat exchange tubes, which are arranged at intervals along the axial direction of the condensation section.

10. The high-pressure ammonium carbamate condenser for urea according to claim 5, characterized in that, The spraying section, liquid collection section, reaction section, condensation section and mixing section are integrally formed.

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