Novel urea high-pressure condenser
By designing an extended upper tube box, distributor, urea-grade filler and plate tower tray in the urea high-pressure condenser, the three separations of urea and methylamine liquid are achieved, which solves the problems of high cost of traditional equipment materials and poor separation effect, and reduces maintenance needs and production costs.
Patent Information
- Application Number
- CN202420585806.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-03-25
AI Technical Summary
In existing urea high-pressure condensers, cyanate and ammonium cyanooxygen are highly corrosive, resulting in high cost of equipment materials, and the separation effect of traditional liquid distributors is poor, which requires a scrubber for equipment maintenance.
A new type of urea high-pressure condenser was designed. By extending the upper tube box as a whole, the distributor was set at the inlet position of urea and methylamine liquid, the filler made of urea grade material was used for secondary separation, and a four-layer plate tower tray was set at the end to achieve three separations of urea and methylamine liquid. At the same time, an integrated multi-layer clamping structure and surfacing connection are adopted to reduce costs and prevent uneven leakage of liquid into the tray through the uplift pipe.
It improves the separation effect of urea and methylamine liquid, reduces equipment maintenance needs, reduces production costs, and extends the service life of the equipment.
Smart Images
Figure CN222688928U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical equipment, in particular to a novel urea high-pressure condenser. Background Art
[0002] The high-pressure condenser for urea production is one of the most critical equipment in the urea production unit. The four major parts of urea production equipment are urea synthesis tower, stripping tower, high-pressure condenser and scrubber. The high-pressure condenser is one of the four major parts of urea production equipment. It is used to cool the high-pressure methylamine liquid in the urea synthesis reaction. It plays an important role in the urea production process. Since the cyanic acid and ammonium cyanide produced in the urea synthesis reaction are extremely corrosive, the materials in contact with them are all imported urea-grade special materials, and their cost is very high. Utility Model Content
[0003] In view of the above problems existing in the prior art, the utility model provides a novel urea high-pressure condenser for overcoming the above defects in the prior art.
[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is as follows:
[0005] A novel urea high-pressure condenser comprises a lower bottom cover assembly, a lower head assembly, a lower pipe box assembly, a first cylinder, a first cone, a second cylinder, a third cylinder, a second cone, a fourth cylinder, a third cone, an upper pipe box assembly, a wrapped cylinder assembly, a fifth cylinder, a fourth cone, a sixth cylinder, an end flange assembly and a top cover assembly which are sequentially connected from bottom to top; a distributor is arranged at the upper end of the sixth cylinder, a liquid inlet pipe is inserted into the interior of the top cover assembly, an outlet at the lower end of the liquid inlet pipe abuts against the upper end of the distributor, a packing placement piece is arranged at the middle position of the sixth cylinder, a packing made of urea-grade material is arranged inside the packing placement piece, and four plate trays are arranged at intervals up and down inside the wrapped cylinder assembly.
[0006] In one of the embodiments, an air riser is longitudinally arranged inside the junction of the fourth cone and the sixth cylinder.
[0007] In one embodiment, the wrapping cylinder assembly includes an inner liner, an inner cylinder and several layers of layer plates, the inner cylinder is sleeved on the outside of the inner liner, and several layers of the layer plates are sequentially sleeved on the outside of the inner cylinder.
[0008] In one embodiment, the inner tube and the inner liner are interference fit.
[0009] In one embodiment, the upper end surfaces of several layers of the layer boards are distributed in a step-like manner and are offset downward from the outside to the inside, and the lower end surfaces of several layers of the layer boards are distributed in a step-like manner and are offset upward from the outside to the inside.
[0010] In one embodiment, the lower end surface of the fifth cylinder and the upper end surface of the upper tube box assembly are respectively designed to be stepped corresponding to the two ends of the liner, inner tube and several layers of plate, and the upper ends of the liner, inner tube and several layers of plate and the fifth cylinder, as well as the lower ends thereof and the upper tube box assembly are connected by surfacing welding.
[0011] In one of the embodiments, a plurality of support grilles are respectively provided inside the second cylinder and the third cylinder, a plurality of tie rods are provided passing through the interior of the plurality of support grilles, the upper ends of the plurality of tie rods are respectively connected to the upper tube box assembly, a plurality of baffles are respectively provided on the plurality of tie rods, and the baffles respectively abut against the upper end faces and the lower end faces of the plurality of support grilles, a plurality of heat exchange tubes are respectively provided longitudinally inside the plurality of support grilles, and the heat exchange tubes correspondingly pass through the support grilles located inside the second cylinder and the third cylinder.
[0012] In one embodiment, a lower guide cylinder is longitudinally arranged inside the first cylinder and the first cone, an upper guide cylinder is longitudinally arranged inside the second cone and the fourth cylinder, and the lower pipe box assembly, the first cylinder, the first cone, the second cylinder, the third cylinder, the second cone, the fourth cylinder, the third cone, the upper pipe box assembly, the wrapping cylinder assembly, the fifth cylinder and the fourth cone are internally provided with interconnected connecting pipe assemblies, and the upper end surface of the connecting pipe assembly is flush with the lower end surface of the riser.
[0013] In one of the embodiments, an expansion joint and a protective device are provided on the outer wall of the second cylinder, a grounding plate and a support are provided on the outer wall of the upper tube box assembly, a gas outlet pipe is also inserted inside the top cover assembly, a mixture inlet pipe is inserted inside the lower bottom cover assembly, a liquid discharge pipe connected to the interior of the fifth cylinder is provided on the side wall, the liquid discharge pipe is in the shape of "┛" as a whole, and its upper end is funnel-shaped, a condensate inlet is provided on the left side wall of the first cylinder, a low-pressure steam outlet is provided on the right side wall of the fourth cylinder, a preheating steam inlet and a discharge port are provided on the right side wall of the first cylinder, and the preheating steam inlet is located above the discharge port, an exhaust port is provided on the right side wall of the upper tube box assembly, and a bursting plate interface is provided on the left side wall of the fourth cylinder.
[0014] In one of the embodiments, a lower toothed pad is provided between the lower bottom cover assembly and the lower head assembly, and an upper toothed pad is provided between the end flange assembly and the top cover assembly.
[0015] Compared with the prior art, the novel urea high-pressure condenser provided by the utility model has the following advantages:
[0016] First, the design lengthens the upper pipe box as a whole, sets the distributor at the inlet position of urea and methylamine liquid, and then sets fillers made of urea-grade materials for secondary separation. Finally, a four-layer plate tower is set to achieve three separations of urea and methylamine liquid in sequence. Compared with the traditional liquid distributor, the separation effect is better, and this structure can eliminate the equipment scrubber in the urea production equipment.
[0017] Second, an air riser is arranged in the middle part between the packing distributor and the liquid outlet. The air riser can provide an ascending channel for the gas phase below, and at the same time prevent the liquid from leaking unevenly onto the tower plate.
[0018] Third, due to the high height of the upper tube box, the cost of surfacing welding is high, so the design adopts an integral multi-layer clamping structure. The inner tube and layer material is Q345R, the lining is made of urea-grade material X1CrNiMoN25-22-2, and the inner tube and the lining are interference fit. The manufacturing process adopts the hot-fit method to ensure that there is no gap between the inner tube and the lining, which ensures the manufacturing requirements and saves costs.
[0019] Fourth, urea-grade material X1CrNiMo25-22-2 has strong corrosion resistance and is a special stainless steel material for urea. Its corrosion is greatly affected by temperature and is prone to intergranular corrosion. In order to avoid intergranular corrosion of urea-grade materials caused by heat treatment of the equipment, the parts connected to it and made of 20MnMo material need to be subjected to stress relief heat treatment. Therefore, J507 welding rods are used for surfacing treatment between the lining, inner cylinder and the upper end of several layers of plate and the fifth cylinder, and between the lower end and the upper pipe box assembly. This can avoid stress relief heat treatment and ensure the corrosion resistance of urea-grade materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the main cutaway structure of the utility model;
[0021] Figure 2 It is a partial cross-sectional structural schematic diagram of the wrapping cylinder assembly in the utility model;
[0022] Figure 3 It is a partial cross-sectional structural schematic diagram of the upper end connection of the wrapping cylinder assembly in the utility model;
[0023] Figure 4It is a partial cross-sectional structural schematic diagram of the lower end connection of the wrapping cylinder assembly in the utility model;
[0024] Figure 5 This is a schematic diagram of the main cutaway structure of a traditional high-pressure condenser. DETAILED DESCRIPTION
[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.
[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0030] like Figure 1-5 As shown, for the convenience of description, the directions of "up", "down", "left", "right", "front" and "rear" in the present invention are based on the attached Figure 1 The directions shown shall prevail;
[0031] A novel urea high-pressure condenser comprises a lower bottom cover assembly 1, a lower head assembly 2, a lower pipe box assembly 3, a first cylinder 4, a first cone 5, a second cylinder 6, a third cylinder 7, a second cone 8, a fourth cylinder 9, a third cone 10, an upper pipe box assembly 11, a wrapped cylinder assembly 12, a fifth cylinder 13, a fourth cone 14, a sixth cylinder 15, an end flange assembly 16 and a top cover assembly 17, which are sequentially connected from bottom to top. A distributor 18 is arranged at the upper end of the sixth cylinder 15, a liquid inlet pipe 19 is inserted into the top cover assembly 17, and the outlet of the lower end of the liquid inlet pipe 19 abuts against the upper end of the distributor 18. A packing arrangement member 20 is arranged at the middle position inside the sixth cylinder 15, and a packing made of urea-grade material is arranged inside the packing arrangement member 20. Four plate trays 21 are arranged at intervals from top to bottom inside the wrapped cylinder assembly 12.
[0032] The high-pressure condenser is a typical vertical heat exchanger, which is mainly used to separate and cool the urea and methylamine liquid in the urea synthesis tower. The medium in the tube side is urea and methylamine liquid. After separation, the urea and methylamine liquid exchange heat with the water vapor in the shell side. After cooling and separation, they are divided into gas, liquid and mixture parts and discharged separately. Its main structure is composed of spherical head welded urea grade materials, high-pressure pipe box, tube sheet, tube bundle, low-pressure shell and other parts. The total height of the equipment is about 26.3m. The upper pipe box is originally equipped with a liquid distributor. The structure is as follows Figure 5 As shown. The pipe material is ammonium carbamate liquid, which is highly corrosive. The tube sheet and the head adopt a double-layer surfacing structure, and the materials of the surfacing transition layer and the corrosion-resistant layer are both 25-22-2LMn, and the total surfacing thickness is not less than 8mm; the high-pressure pipe box adopts a lining structure, the base material is 20MnMoⅣ forgings, and the lining material is urea grade material.
[0033] The utility model provides a novel urea high-pressure condenser, which is designed to lengthen the upper tube box as a whole, set the distributor 18 at the inlet position of urea and methylamine liquid, and then set the filler made of urea-grade material for secondary separation, and finally set the four-layer plate tray 21 to achieve the third separation of urea and methylamine liquid. Compared with the traditional liquid distributor, the separation effect is better, and after adopting this structure, the equipment scrubber in the urea production equipment can be eliminated, which greatly reduces the cost required for the entire urea production equipment.
[0034] Furthermore, a riser 22 is longitudinally arranged inside the junction of the fourth cone 14 and the sixth cylinder 15. By arranging the riser 22 in the middle position between the distributor 18 and the liquid outlet, the riser 22 can provide an ascending channel for the gas phase below, while preventing the liquid from leaking unevenly onto the tower plate.
[0035] Specifically, the wrapping cylinder assembly 12 includes an inner liner 121, an inner cylinder 122, and three layers of plates 123. The inner cylinder 122 is sleeved on the outside of the inner liner 121, and the three layers of plates 123 are sleeved on the outside of the inner cylinder 122 in sequence.
[0036] Preferably, the inner cylinder 122 and the inner liner 121 are in interference fit, and the manufacturing process adopts a shrink fit method to ensure that there is no gap between the inner cylinder 122 and the inner liner 121, thereby ensuring manufacturing requirements and saving costs.
[0037] In this embodiment, the upper end surface of the three-layer plate 123 is distributed in a step-like manner and deviates downward from the outside to the inside, and the lower end surface of the three-layer plate 123 is distributed in a step-like manner and deviates upward from the outside to the inside;
[0038] Furthermore, the lower end surface of the fifth cylinder 13 and the upper end surface of the upper tube box assembly 11 are respectively designed to be stepped corresponding to the two ends of the liner 121, the inner cylinder 122 and the three-layer plate 123, and the upper ends of the liner 121, the inner cylinder 122 and the three-layer plate 123 are connected to the fifth cylinder 13 and the lower ends are connected to the upper tube box assembly 11 by surfacing welding. It is designed that the upper ends of the liner 121, the inner cylinder 122 and the three-layer plate 123 are connected to the fifth cylinder 13 and the lower ends are connected to the upper tube box assembly 11 by J507 welding rods, which can avoid stress relief heat treatment and ensure the corrosion resistance of urea-grade materials.
[0039] In this embodiment, a plurality of support grilles 23 are respectively provided inside the second cylinder 6 and the third cylinder 7, and a plurality of tie rods 24 are provided through the interior of the plurality of support grilles 23, and the upper ends of the plurality of tie rods 24 are respectively connected to the upper tube box assembly 11, and a plurality of baffles 25 are respectively provided on the plurality of tie rods 24, and the baffles 25 respectively abut against the upper end faces and the lower end faces of the plurality of support grilles 23 correspondingly, so that the support grilles 23 are fixed by utilizing the mutual cooperation of the tie rods 24 and the baffles 25, and a plurality of heat exchange tubes 26 are respectively longitudinally provided inside the lower tube box assembly 3, the first cylinder 4, the first cone 5, the second cylinder 6, the third cylinder 7, the second cone 8, the fourth cylinder 9, the third cone 10 and the upper tube box assembly 11, and the heat exchange tubes 26 correspondingly pass through the support grilles 23 located inside the second cylinder 6 and the third cylinder 7, so that the support grilles 23 can fix and space the heat exchange tubes 26.
[0040] In this embodiment, a lower guide tube 27 is longitudinally arranged inside the first cylinder 4 and the first cone 5, an upper guide tube 28 is longitudinally arranged inside the second cone 8 and the fourth cylinder 9, and the lower pipe box assembly 3, the first cylinder 4, the first cone 5, the second cylinder 6, the third cylinder 7, the second cone 8, the fourth cylinder 9, the third cone 10, the upper pipe box assembly 11, the wrapping cylinder assembly 12, the fifth cylinder 13, and the fourth cone 14 are internally provided with an interconnected connecting pipe assembly 40, and the upper end surface of the connecting pipe assembly 40 is flush with the lower end surface of the riser 22.
[0041] In this embodiment, an expansion joint and a protective device 41 are provided on the outer wall of the second cylinder 6, and a grounding plate 29 and a support 30 are provided on the outer wall of the upper tube box assembly 11.
[0042] A gas outlet pipe 31 is also installed inside the top cover assembly 17, a mixture inlet pipe 32 is installed inside the lower bottom cover assembly 1, a liquid discharge pipe 33 connected to the interior of the fifth cylinder 13 is provided on the side wall, the liquid discharge pipe 33 is in a "┛" shape as a whole, and its upper end is funnel-shaped, a condensate inlet 34 is provided on the left side wall of the first cylinder 4, a low-pressure steam outlet 35 is provided on the right side wall of the fourth cylinder 9, a preheating steam inlet 36 and a discharge port 37 are provided on the right side wall of the first cylinder 4, and the preheating steam inlet 36 is located above the discharge port 37, an exhaust port 38 is provided on the right side wall of the upper tube box assembly 11, and a bursting plate interface 39 is provided on the left side wall of the fourth cylinder 9.
[0043] In this embodiment, a lower toothed pad is arranged between the lower bottom cover assembly 1 and the lower head assembly 2, and an upper toothed pad is arranged between the end flange assembly 16 and the top cover assembly 17. By arranging the lower toothed pad and the upper toothed pad, the sealing between the lower bottom cover assembly 1 and the lower head assembly 2 and between the end flange assembly 16 and the top cover assembly 17 is increased.
[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A new type of urea high-pressure condenser, characterized in that: It includes a lower bottom cover assembly, a lower head assembly, a lower pipe box assembly, a first cylinder, a first cone, a second cylinder, a third cylinder, a second cone, a fourth cylinder, a third cone, an upper pipe box assembly, a wrapped cylinder assembly, a fifth cylinder, a fourth cone, a sixth cylinder, an end flange assembly and a top cover assembly which are connected in sequence from bottom to top. A distributor is provided at the upper end of the interior of the sixth cylinder, a liquid inlet pipe is inserted into the interior of the top cover assembly, and the outlet at the lower end of the liquid inlet pipe abuts against the upper end of the distributor, a packing placement piece is provided at the middle position inside the sixth cylinder, a packing made of urea-grade material is provided inside the packing placement piece, and four plate tower plates are provided at upper and lower intervals inside the wrapped cylinder assembly.
2. A novel urea high-pressure condenser according to claim 1, characterized in that: An air riser is longitudinally arranged inside the junction of the fourth cone and the sixth cylinder.
3. A novel urea high-pressure condenser according to claim 2, characterized in that: The wrapping cylinder assembly comprises an inner liner, an inner cylinder and several layers of plate. The inner cylinder is sleeved on the outside of the inner liner, and several layers of plate are sleeved on the outside of the inner cylinder in sequence.
4. A novel urea high-pressure condenser according to claim 3, characterized in that: The inner tube and the inner liner are in interference fit.
5. A novel urea high-pressure condenser according to claim 4, characterized in that: The upper end surfaces of several layers of the layer boards are distributed in a step-like manner and are offset downward from the outside to the inside in sequence. The lower end surfaces of several layers of the layer boards are distributed in a step-like manner and are offset upward from the outside to the inside in sequence.
6. A novel urea high-pressure condenser according to claim 5, characterized in that: The lower end surface of the fifth cylinder and the upper end surface of the upper tube box assembly are respectively designed to be stepped corresponding to the two ends of the liner, inner cylinder and several layers of plate, and the upper ends of the liner, inner cylinder and several layers of plate and the fifth cylinder, as well as the lower ends thereof and the upper tube box assembly are connected by surfacing welding.
7. A novel urea high-pressure condenser according to claim 4, characterized in that: Several supporting grilles are respectively provided inside the second cylinder and the third cylinder, and several tie rods are arranged penetrating inside the several supporting grilles. The upper ends of the several tie rods are respectively connected to the upper tube box assemblies, and several baffles are respectively provided on the several tie rods, and the baffles are respectively abutted against the upper end faces and lower end faces of the several supporting grilles. Several heat exchange tubes are respectively arranged longitudinally inside the lower tube box assembly, the first cylinder, the first cone, the second cylinder, the third cylinder, the second cone, the fourth cylinder, the third cone and the upper tube box assembly, and the heat exchange tubes correspondingly penetrate the supporting grilles located inside the second cylinder and the third cylinder.
8. A novel urea high-pressure condenser according to claim 7, characterized in that: A lower guide cylinder is longitudinally arranged inside the first cylinder and the first cone, an upper guide cylinder is longitudinally arranged inside the second cone and the fourth cylinder, and the lower pipe box assembly, the first cylinder, the first cone, the second cylinder, the third cylinder, the second cone, the fourth cylinder, the third cone, the upper pipe box assembly, the wrapping cylinder assembly, the fifth cylinder and the fourth cone are internally provided with interconnected connecting pipe assemblies, and the upper end surface of the connecting pipe assembly is flush with the lower end surface of the riser.
9. A novel urea high-pressure condenser according to claim 7, characterized in that: An expansion joint and a protective device are provided on the outer wall of the second cylinder, a grounding plate and a support are provided on the outer wall of the upper tube box assembly, a gas outlet pipe is also installed inside the top cover assembly, a mixture inlet pipe is installed inside the lower bottom cover assembly, a liquid discharge pipe connected with the interior thereof is provided on the side wall of the fifth cylinder, the liquid discharge pipe is in the shape of "┛" as a whole, and its upper end is funnel-shaped, a condensate inlet is provided on the left side wall of the first cylinder, a low-pressure steam outlet is provided on the right side wall of the fourth cylinder, a preheating steam inlet and a discharge port are provided on the right side wall of the first cylinder, and the preheating steam inlet is located above the discharge port, an exhaust port is provided on the right side wall of the upper tube box assembly, and a bursting plate interface is provided on the left side wall of the fourth cylinder.
10. A novel urea high-pressure condenser according to claim 1, characterized in that: A lower toothed pad is arranged between the lower bottom cover assembly and the lower head assembly, and an upper toothed pad is arranged between the end flange assembly and the top cover assembly.