Synthetic ammonia cold separation external cooler

Abstract

The utility model relates to the technical field of external coolers, in particular to a synthetic ammonia cold separation external cooler which comprises a cold separation external cooler body, a barrel is arranged on the cold separation external cooler body, an upper tube plate and a lower tube plate are fixed to the upper end and the lower end of the barrel respectively, and the other side of the upper tube plate and the other side of the lower tube plate are connected with an upper seal head and a lower seal head respectively. Second baffle plates and first baffle plates which are evenly distributed at intervals are arranged between the upper tube plate and the lower tube plate, and heat exchange tube holes corresponding in position are formed among the upper tube plate, the lower tube plate, the second baffle plates and the first baffle plates. Heat exchange tubes made of titanium materials are fixed among the upper tube plate, the lower tube plate, the second baffle plate and the first baffle plate in a penetrating mode, and the upper sealing head and the lower sealing head are both of a cone structure. According to the synthesis ammonia cold separation external cooler, the heat exchange pipes are replaced by titanium materials, the number of the heat exchange pipes is increased, the size of the heat exchange pipes is reduced, the more efficient heat exchange effect is achieved, the production efficiency is improved, and the existing working condition requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of external coolers, in particular to a synthetic ammonia cooling external cooler. Background Art

[0002] The cold analysis external cooler is a type of heat exchanger. It is a device that transfers part of the heat of the hot fluid to the cold fluid. It plays an important role in chemical, petroleum, power, food and many other industrial productions. It can be used as a heater, cooler, condenser, evaporator and reboiler in chemical production, and is widely used. The cold analysis external cooler can realize the heat transfer between materials between two or more fluids at different temperatures, so that the heat is transferred from the higher temperature fluid to the lower temperature fluid, so that the fluid temperature reaches the specified index of the process, so as to meet the needs of the process conditions and achieve the purpose of energy saving. In the synthetic ammonia production process, the cold analysis external cooler is used in the ammonia separation stage after synthesis to cool the high-temperature gas mixture coming out of the synthesis tower. The cold analysis external cooler uses circulating water, frozen brine or other refrigerants as cooling media, and reduces the temperature of the gas mixture to below the condensation temperature of ammonia through heat exchange, so as to promote the condensation of ammonia into liquid ammonia. Not only can ammonia be efficiently recovered, but unreacted nitrogen and hydrogen can also be recycled back to the synthesis reactor, improving the efficiency and economy of the entire production process.

[0003] The existing crystallization external cooler circulation device and method in the soda ash production process of the soda ash process disclosed in Publication No. CN108584990A proposes to adjust the mother liquor circulation process in the external cooler to top-in and bottom-out, and at the same time, conduct countercurrent heat exchange with the refrigerant medium to improve the cooling effect of the external cooler, extend the operation cycle of the external cooler, and ensure stable production. However, with the increase of equipment pressure, the old equipment can no longer meet the working conditions. The heat exchange requirements cannot be met through the traditional heat exchange structure, affecting the production efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide an external cooler for cooling synthetic ammonia, so as to solve the problem raised by the above-mentioned background technology that in the current synthetic ammonia production on the market, with the increase of equipment pressure, the old equipment can no longer meet the working conditions, and the external cooler cannot meet the heat exchange requirements through the traditional heat exchange structure, thereby affecting the production efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a synthetic ammonia cold analysis external cooler, comprising a cold analysis external cooler main body, a cylinder is provided on the cold analysis external cooler main body, and an upper tube sheet and a lower tube sheet are fixed to the upper and lower ends of the cylinder respectively, and an upper head and a lower head are connected to the other sides of the upper tube sheet and the lower tube sheet respectively, a second baffle and a first baffle evenly distributed are provided between the upper tube sheet and the lower tube sheet, and heat exchange tube holes corresponding to positions are opened between the upper tube sheet, the lower tube sheet, the second baffle and the first baffle, and heat exchange tubes made of titanium are passed through and fixed between the upper tube sheet, the lower tube sheet, the second baffle and the first baffle, the upper head and the lower head are both conical structures, and the upper head and the lower head are respectively provided with a circulating liquid outlet and a circulating liquid inlet, a chilled water inlet and a chilled water outlet are provided on the side of the cylinder, and the chilled water inlet and the chilled water outlet are both variable diameter structures.

[0006] Preferably, the first baffle and the second baffle are of symmetrical structure, and opposite ends of the first baffle and the second baffle are both provided with notch structures, and an S-shaped structure is formed between the first baffle and the second baffle.

[0007] Preferably, the first baffle and the second baffle are respectively provided with pull rod holes corresponding to the upper and lower positions, and a pull rod passes through the pull rod holes, and a spacing tube is provided outside the pull rod, and the spacing tube is respectively located between the adjacent first baffles and the first baffle, between the first baffle and the second baffle, and between the second baffle and the second baffle.

[0008] Preferably, a tie rod hole is also provided on the lower tube plate, and one end of the tie rod is inserted and fixed in the lower tube plate through the tie rod hole, and the upper end of the tie rod is respectively penetrated through the uppermost first baffle plate and the second baffle plate and fastened with a rear nut.

[0009] Preferably, vent pipes are respectively welded and fixed to the outer lower end of the upper tube plate and the outer upper end of the lower tube plate, and the vent pipes are connected to the interior of the cylinder.

[0010] Preferably, at least two manholes are installed on the sides of the upper head and the lower head respectively, and pipe box lifting ears are welded and fixed on the sides of the upper head and the lower head respectively. The side of the upper head is also provided with a cleaning port outlet and a spare port, and the cleaning port outlet and the spare port are sealed by blind plates respectively.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the synthetic ammonia cooling external cooler replaces the heat exchange tube with titanium material, increases the number of heat exchange tubes, reduces the size of the heat exchange tubes, achieves a more efficient heat exchange effect, improves production efficiency, and meets the existing working conditions. The synthetic ammonia cooling external cooler uses carbon steel materials for the cylinder, upper head, and lower head, which have better strength and meet the pressure requirements. At the same time, the cooling external cooler can be installed horizontally, and the heat exchange effect is improved by combining horizontal and vertical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of an external cooler for synthetic ammonia cooling in the utility model;

[0013] Figure 2 This utility model is a synthetic ammonia cooling external cooler Figure 1 The enlarged structural diagram at A in the middle;

[0014] Figure 3 This utility model is a synthetic ammonia cooling external cooler Figure 1 The enlarged structural diagram at B in the middle;

[0015] Figure 4 This utility model is a synthetic ammonia cooling external cooler Figure 1 The enlarged structural diagram at C in the middle;

[0016] Figure 5 This is a top view of an external cooler for synthetic ammonia cooling in the utility model;

[0017] Figure 6 This is a schematic diagram of the structure of a pull rod hole on the first baffle plate of a synthetic ammonia cold analysis external cooler of the utility model;

[0018] Figure 7 This is a schematic diagram of the structure of heat exchange tube holes on the first baffle plate of a synthetic ammonia cold analysis external cooler of the utility model;

[0019] Figure 8 This is a schematic diagram of the structure of a pull rod hole on the lower tube plate of a synthetic ammonia cold analysis external cooler of the utility model;

[0020] Fig. 9 This is a schematic diagram of the structure of heat exchange tube holes on the lower tube plate of a synthetic ammonia cold analysis external cooler of the utility model;

[0021] Fig.10 This is a schematic diagram of the pull rod structure of a synthetic ammonia cooling external cooler of the utility model;

[0022] Fig.11 This is a cross-sectional view of a manhole of an external cooler for synthetic ammonia cooling in the utility model;

[0023] Fig.12 The utility model is a front view of a manhole of an external cooler for synthetic ammonia cooling.

[0024] In the figure: 1. main body of cold analysis external cooler; 2. circulating liquid outlet; 3. cleaning outlet; 4. upper tube sheet; 5. first baffle; 6. distance pipe; 7. vent pipe; 8. lower tube sheet; 9. lower head; 10. circulating liquid inlet; 11. pipe box lifting ear; 12. upper head; 13. manhole; 14. chilled water inlet; 15. tie rod; 16. second baffle; 17. cylinder; 18. chilled water outlet; 19. heat exchange tube; 20. spare port; 21. tie rod hole; 22. heat exchange tube hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-12The utility model provides a technical solution: a synthetic ammonia cold analysis external cooler, comprising a cold analysis external cooler body 1, a cylinder 17 is provided on the cold analysis external cooler body 1, and an upper tube sheet 4 and a lower tube sheet 8 are fixed to the upper and lower ends of the cylinder 17 respectively, and the upper tube sheet 4 and the lower tube sheet 8 are respectively connected to an upper head 12 and a lower head 9 on the other side, a second baffle 16 and a first baffle 5 are arranged between the upper tube sheet 4 and the lower tube sheet 8, and heat exchange tube holes 22 corresponding to the positions are opened between the upper tube sheet 4, the lower tube sheet 8, the second baffle 16 and the first baffle 5, the first baffle 5 and the second baffle 16 are symmetrical structures, and the opposite ends of the first baffle 5 and the second baffle 16 are both provided with a notch structure, and the first baffle 5 The first baffle 5 and the second baffle 16 form an S-shaped structure. This structure uses the first baffle 5 and the second baffle 16 to guide the chilled water flowing in the cylinder 17, thereby increasing the flow path of the chilled water and allowing the chilled water to fully contact the heat exchange tube 19, so that the liquid side flowing between the lower head 9 and the upper head 12 is heat exchanged when passing through the heat exchange tube 19, thereby promoting the condensation of ammonia into liquid ammonia. The first baffle 5 and the second baffle 16 are respectively provided with pull rod holes 21 corresponding to the upper and lower positions, and the pull rod 15 passes through the pull rod hole 21. The pull rod 15 is outer-mounted with a spacing tube 6, and the spacing tube 6 is respectively located between the adjacent first baffle 5 and the first baffle 5, between the first baffle 5 and the second baffle 16, and between the second baffle 16 and the first baffle 16. Between the two baffles 16, this structure enables the tie rod hole 21 to relatively connect and stabilize the first baffle 5 and the second baffle 16, and the first baffle 5 and the second baffle 16 are spaced by the spacing tube 6, so that the first baffle 5 and the second baffle 16 are evenly distributed, and the heat exchange tube 19 made of titanium is passed through and fixed between the upper tube plate 4, the lower tube plate 8, the second baffle 16 and the first baffle 5. The heat exchange tube 19 is made of titanium and is replaced by the material. Compared with the traditional stainless steel material, the number of heat exchange tubes 19 is increased and the diameter of the heat exchange tube 19 is reduced, so that the heat transfer effect is better and the heat exchange effect is improved. The lower end of the outer side of the upper tube plate 4 and the upper end of the outer side of the lower tube plate 8 are respectively welded and fixed with a vent tube 7, and the vent tube 7 is connected to the inside of the cylinder 17. This structure can drain the liquid in the cylinder 17 through the vent pipe 7, the upper tube sheet 4 and the lower tube sheet 8 are sealed with the upper head 12 and the lower head 9 through sealing gaskets, and the upper tube sheet 4 and the lower tube sheet 8 are connected with the upper head 12 and the lower head 9 respectively through the flange structure. The upper head 12 and the lower head 9 are both cone structures, and the ends of the upper head 12 and the lower head 9 are respectively provided with a circulating liquid outlet 2 and a circulating liquid inlet 10. A tie rod hole 21 is also opened on the lower tube sheet 8, and one end of the tie rod 15 is plugged and fixed in the lower tube sheet 8 through the tie rod hole 21. The upper end of the tie rod 15 is respectively penetrated with the first baffle 5 and the second baffle 16 at the uppermost end and then fastened with a nut. This structure allows the lower end of the tie rod 15 to be firmly positioned through the lower tube sheet 8.The side of the cylinder 17 is provided with a chilled water inlet 14 and a chilled water outlet 18, and the chilled water inlet 14 and the chilled water outlet 18 are both variable diameter structures. Under the premise of ensuring the flow rate, they can be easily connected to the external pipeline to reduce the equipment modification cost. At least two manholes 13 are installed on the sides of the upper head 12 and the lower head 9, and the upper head 12 and the lower head 9 are respectively welded and fixed with pipe box lifting ears 11. The side of the upper head 12 is also provided with a cleaning port outlet 3 and a spare port 20, and the cleaning port outlet 3 and the spare port 20 are respectively sealed and blocked by blind plates. The setting of the pipe box lifting ears 11 of this structure can make the cold analysis external cooler body 1 be hoisted and fixed, so that the cold analysis external cooler body 1 can be installed horizontally. The heat transfer effect is improved by combining horizontal and vertical use. The pipelines of the cold analysis external cooler body 1 are controlled by flow control valves for flow control and monitoring. The cold analysis external cooler body 1 except the heat exchange tube 19 is made of carbon steel.

[0027] Working principle: When using the synthetic ammonia cold analysis external cooler, first, the pipe box hanging ear 11 enables the cold analysis external cooler body 1 to be installed horizontally. In the ammonia separation stage of the synthetic ammonia process, the high-temperature gas mixture coming out of the synthesis tower enters the lower head 9 through the circulating liquid inlet 10, then enters the upper head 12 through the heat exchange tube 19, and is finally discharged from the circulating liquid outlet 2. The chilled water enters and exits the cylinder 17 through the chilled water inlet 14 and the chilled water outlet 18. The high-temperature gas mixture is heat-exchanged with the chilled water in the heat exchange tube 19. The temperature of the gas mixture drops below the condensation temperature of ammonia, which causes the ammonia gas to condense into liquid ammonia. The chilled water flows in the cylinder 17 through the S-shaped channel formed by the first baffle 5 and the second baffle 16, allowing The high-temperature gas mixture in the chilled water heat exchange tube 19 is fully heat exchanged, the tie rod 15 stabilizes the first baffle 5 and the second baffle 16 relative to the lower tube sheet 8, and the distance tube 6 is used for the distance treatment of the first baffle 5 and the second baffle 16. The upper tube sheet 4, the lower tube sheet 8, the first baffle 5 and the second baffle 16 are respectively used for the stable installation of the heat exchange tube 19. The vent pipe 7 and the cleaning outlet 3 are respectively used for cleaning and venting when the cold analysis external cooler body 1 is cleaned. The lower head 9 and the upper head 12 can be entered through the manhole 13. The spare port 20 is used for spare sewage treatment. The tie rod hole 21 and the heat exchange tube hole 22 are respectively used for the installation and positioning of the tie rod 15 and the heat exchange tube 19, thereby completing a series of tasks.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A synthetic ammonia cold-out external cooler, comprising a cold-out external cooler body (1), characterized in that: The cold analysis external cooler body (1) is provided with a cylinder (17), and an upper tube sheet (4) and a lower tube sheet (8) are fixed to the upper and lower ends of the cylinder (17), respectively, and the upper tube sheet (4) and the lower tube sheet (8) are connected to an upper head (12) and a lower head (9) on the other side, respectively, and a second baffle (16) and a first baffle (5) are arranged between the upper tube sheet (4) and the lower tube sheet (8) at even intervals, and heat exchange tubes corresponding to the positions are provided between the upper tube sheet (4), the lower tube sheet (8), the second baffle (16) and the first baffle (5). The heat exchange tube (19) is made of titanium and is fixedly connected between the upper tube plate (4), the lower tube plate (8), the second baffle plate (16) and the first baffle plate (5). The upper head (12) and the lower head (9) are both cone structures, and the ends of the upper head (12) and the lower head (9) are respectively provided with a circulating liquid outlet (2) and a circulating liquid inlet (10). The side of the cylinder (17) is provided with a chilled water inlet (14) and a chilled water outlet (18), and the chilled water inlet (14) and the chilled water outlet (18) are both variable diameter structures.

2. The synthetic ammonia cooling external cooler according to claim 1, characterized in that: The first baffle (5) and the second baffle (16) are symmetrical structures, and opposite ends of the first baffle (5) and the second baffle (16) are both provided with a notch structure, and an S-shaped structure is formed between the first baffle (5) and the second baffle (16).

3. The synthetic ammonia cooling external cooler according to claim 1, characterized in that: The first baffle plate (5) and the second baffle plate (16) are respectively provided with pull rod holes (21) corresponding to upper and lower positions, and a pull rod (15) passes through the pull rod hole (21), and a distance tube (6) is provided on the outer shell of the pull rod (15), and the distance tube (6) is respectively located between the adjacent first baffle plates (5) and the first baffle plates (5), between the first baffle plates (5) and the second baffle plates (16), and between the second baffle plates (16).

4. The synthetic ammonia cooling external cooler according to claim 3, characterized in that: The lower tube plate (8) is also provided with a tie rod hole (21), and one end of the tie rod (15) is inserted and fixed in the lower tube plate (8) through the tie rod hole (21), and the upper end of the tie rod (15) is respectively penetrated through the uppermost first baffle plate (5) and the second baffle plate (16) and fastened with a rear nut.

5. The synthetic ammonia cooling external cooler according to claim 1, characterized in that: A vent pipe (7) is welded and fixed to the lower end of the outer side of the upper tube plate (4) and the upper end of the outer side of the lower tube plate (8), respectively, and the vent pipe (7) is communicated with the interior of the cylinder (17).

6. The synthetic ammonia cooling external cooler according to claim 1, characterized in that: At least two manholes (13) are respectively installed on the sides of the upper head (12) and the lower head (9), and pipe box lifting ears (11) are respectively welded and fixed on the sides of the upper head (12) and the lower head (9). A cleaning port outlet (3) and a spare port (20) are also provided on the side of the upper head (12), and the cleaning port outlet (3) and the spare port (20) are respectively sealed by blind plates.

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