Urea ammonia production unit

Abstract

The utility model belongs to the technical field of urea ammonia production, and particularly relates to a urea ammonia production unit which comprises a base, a urea dissolving tank and a urea solution storage tank are arranged on the left side of the top of the base, and a hydrolyzer is arranged on the right side of the top of the base. The stirring assembly is installed in the urea dissolving tank to stir a urea solution while lifting in a reciprocating mode, the stirring and mixing efficiency is improved, the urea solution is conveyed through the solution dissolving pump after stirring is completed, and the phenomenon that a urea solution pipeline is blocked due to crystallization caused by too high concentration of partial areas in the urea solution is avoided; liquid outlets are formed in the outer surfaces of the urea dissolving tank, the urea solution storage tank and the hydrolyzer, liquid outlet of the liquid outlets is controlled through sampling valves, so that the urea solution is sampled, an ammonia outlet assembly is arranged at the top of the hydrolyzer, and the ammonia outlet assembly is provided with an ammonia supply mother pipe I and an ammonia supply mother pipe II; when the ammonia supply mother pipe I is blocked, the ammonia supply mother pipe II is switched in time to supply ammonia, so that the safe operation of the unit is prevented from being influenced after the ammonia supply pipeline is blocked.

Description

Technical Field

[0001] This utility model relates to the field of urea-ammonia production technology, specifically to a urea-ammonia production unit. Background Technology

[0002] Urea-to-ammonia technology converts urea into ammonia through pyrolysis or hydrolysis. It is widely used in agriculture as a nitrogen fertilizer, in industry for chemical production, and in environmental protection for nitrogen oxide emission reduction, such as in SCR denitrification systems. This technology not only helps improve nitrogen utilization efficiency but also reduces environmental pollution. Furthermore, with the increasing demand for clean energy, ammonia's potential as a carbon-free fuel has made urea-to-ammonia technology a focus of attention in the energy sector.

[0003] Since the conversion of liquid ammonia production to urea production is a completely new process, compared with the direct supply of ammonia by liquid ammonia evaporation, there are problems such as unqualified urea solution pollution during the ammonia production process, crystallization blockage in the urea solution delivery pipeline, and blockage in the ammonia supply pipeline. Therefore, we propose a urea ammonia production unit. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a urea-to-ammonia unit. By using a stirring component, it prevents excessively high concentrations in certain areas of the prepared urea solution, which could lead to crystallization and blockage of the urea solution pipeline. Sampling of the urea solution in the urea dissolving tank, urea solution storage tank, and hydrolyzer ensures no cross-contamination during ammonia production. The ammonia outlet assembly includes two main ammonia supply pipes; if the first main ammonia supply pipe becomes blocked, the system promptly switches to the second main ammonia supply pipe to prevent blockages from affecting the safe operation of the unit, thus solving the problems mentioned earlier.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a urea-to-ammonia unit, comprising a base, a urea dissolving tank and a urea solution storage tank disposed on the top left side of the base, the urea solution storage tank being disposed in front of the urea dissolving tank, a hydrolyzer disposed on the top right side of the base, a liquid outlet valve one and a liquid outlet valve two being fixedly connected to the bottom of the urea dissolving tank and the bottom of the urea solution storage tank respectively, a solution dissolving pump being disposed between the urea dissolving tank and the urea solution storage tank, a solution transfer pump being disposed between the urea solution storage tank and the hydrolyzer, a stirring assembly being installed inside the urea dissolving tank, and an ammonia outlet assembly being disposed on the top of the hydrolyzer.

[0006] Preferably, the stirring assembly includes a drive motor and a mounting housing. Both the drive motor and the mounting housing are fixedly mounted on the top of the urea dissolving tank. A worm gear is rotatably mounted inside the mounting housing, and a worm is rotatably inserted through the front side of the interior of the mounting housing. The worm gear meshes with the worm. The output shaft of the drive motor is fixedly connected to the left end of the worm. A rotating rod is fixedly connected to the bottom side of the worm gear. The bottom end of the rotating rod rotatably extends into the interior of the urea dissolving tank and is fitted with a rotating tube. A sliding strip is fixedly connected to the inner wall of the rotating tube. A sliding groove is formed on the outer surface of the rotating rod, and the sliding strip is slidably connected to the sliding groove. Several stirring rods are fixedly connected to the outer surface of the rotating tube, and several stirring blades are fixedly connected to the stirring rods. A lifting mechanism is provided on the top side of the rotating tube.

[0007] Preferably, the lifting mechanism includes a fixed sleeve, which is fixedly connected to the inner wall of the top side of the urea dissolving tank. The inner wall of the fixed sleeve is provided with an annular groove. A limit rod is fixedly connected to the outer surface of the rotating tube, and the limit rod is slidably connected to the annular groove.

[0008] Preferably, the ammonia outlet assembly includes two sets of ammonia outlets, which are respectively located on the front and rear sides of the top of the hydrolyzer. The top of each set of ammonia outlets is fixedly connected to a baffle valve. The output ends of the two sets of baffle valves are respectively fixedly connected to an ammonia supply main pipe and an ammonia supply main pipe. The other end of the ammonia supply main pipe is fixedly connected to a baffle valve. The output end of the baffle valve is fixedly connected to the ammonia supply main pipe through a pipe.

[0009] Preferably, the output end of the first outlet valve is fixedly connected to the input end of the solution dissolving pump via a pipe, the output end of the solution dissolving pump is fixedly connected to the urea solution storage tank via a pipe, the output end of the second outlet valve is fixedly connected to the input end of the solution delivery pump via a pipe, and the output end of the solution delivery pump is fixedly connected to the hydrolyzer via a pipe.

[0010] Preferably, both the urea dissolving tank and the urea solution storage tank are equipped with steam heating coils on their inner bottom sides.

[0011] Preferably, both the urea dissolving tank and the urea solution storage tank are equipped with thermometers.

[0012] Preferably, both the urea dissolving tank and the urea solution storage tank are equipped with submersible water level gauges on their tops.

[0013] Preferably, the outer surfaces of the urea dissolving tank, the urea solution storage tank, and the hydrolyzer are all provided with liquid outlets, and sampling valves are fixedly installed on the liquid outlets.

[0014] Preferably, the top of the urea dissolving tank is provided with a water inlet and a feed inlet.

[0015] This utility model provides a urea-to-ammonia production unit. Compared with the prior art, it has the following advantages:

[0016] 1. This urea-to-ammonia unit has a stirring component installed inside the urea dissolving tank. After the urea dissolving tank completes the feeding of urea and water through the inlet and feed inlet, the stirring component stirs the solution. The stirring component is equipped with a lifting mechanism so that it moves up and down while stirring the urea solution, thereby improving the stirring and mixing efficiency. After stirring, the solution is then transported by the solution dissolving pump, which avoids the urea solution from being too concentrated in some areas, causing crystallization and clogging of the urea solution pipeline.

[0017] 2. This urea-to-ammonia unit has outlets on the outer surfaces of the urea dissolving tank, urea solution storage tank, and hydrolyzer. Sampling valves are fixedly connected to the outlets to sample the urea solution in the urea dissolving tank, urea solution storage tank, and hydrolyzer. The chloride ion content and sulfate content in the urea solution are tested sequentially and found to be qualified before entering the next equipment, ensuring that the urea solution of each equipment is not cross-contaminated during the ammonia production process.

[0018] 2. The urea-to-ammonia unit is equipped with an ammonia outlet assembly at the top of the hydrolyzer. The ammonia outlet assembly is equipped with an ammonia supply main pipe 1 and an ammonia supply main pipe 2. When the ammonia supply main pipe 1 becomes blocked, the ammonia supply main pipe 2 is switched in time to supply ammonia, so as to avoid the blockage of the ammonia supply pipeline affecting the safe operation of the unit. Attached Figure Description

[0019] Figure 1 This is a front view structural diagram of the main body of this utility model;

[0020] Figure 2 This is a schematic diagram of the main body structure from the left.

[0021] Figure 3 This is a schematic diagram of the left cross-sectional structure of the urea dissolving tank of this utility model;

[0022] Figure 4 This is a schematic diagram of the connection structure between the rotating tube and the fixed sleeve of this utility model;

[0023] Figure 5 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0024] Figure 6 This utility model Figure 3 Enlarged schematic diagram of the structure at point B;

[0025] Figure 7 This utility model Figure 6 Enlarged schematic diagram of the structure at point C.

[0026] In the diagram: 1. Urea dissolving tank; 2. Urea solution storage tank; 3. Hydrolyzer; 4. Solution dissolving pump; 5. Solution transfer pump; 6. Discharge valve one; 7. Discharge valve two; 8. Ammonia outlet; 9. Baffle valve one; 10. Ammonia supply main pipe one; 11. Ammonia supply main pipe two; 12. Baffle valve two; 13. Base; 14. Drive motor; 15. Mounting housing; 16. Submersible water level gauge; 17. Thermometer; 18. Rotating tube; 19. Stirring rod; 20. Stirring blade; 21. Steam heating coil; 22. Fixing sleeve; 23. Annular chute; 24. Limiting rod; 25. Discharge port; 26. Sampling valve; 27. Worm gear; 28. Worm; 29. ​​Rotating rod; 30. Chute; 31. Sliding bar. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-7 This utility model provides a technical solution: a urea-to-ammonia unit, including a base 13, a urea dissolving tank 1 and a urea solution storage tank 2 are arranged on the top left side of the base 13, the urea solution storage tank 2 is arranged in front of the urea dissolving tank 1, a hydrolyzer 3 is arranged on the top right side of the base 13, a liquid outlet valve 6 and a liquid outlet valve 7 are respectively fixedly connected to the bottom of the urea dissolving tank 1 and the bottom of the urea solution storage tank 2, a solution dissolving pump 4 is arranged between the urea dissolving tank 1 and the urea solution storage tank 2, a solution transfer pump 5 is arranged between the urea solution storage tank 2 and the hydrolyzer 3, a stirring assembly is installed inside the urea dissolving tank 1, and an ammonia outlet assembly is arranged on the top of the hydrolyzer 3.

[0029] When the urea to ammonia production unit is running, water and urea raw materials are added to the urea dissolving tank 1 and mixed by the stirring component. The mixed urea solution is discharged through the discharge valve 6 and transported to the urea solution storage tank 2 by the solution dissolving pump 4. When ammonia production is required, the discharge is controlled by the discharge valve 7 and the urea solution in the urea solution storage tank 2 is transported to the hydrolyzer 3 by the solution transfer pump 5 for hydrolysis to produce ammonia. The generated ammonia gas is discharged through the ammonia discharge component.

[0030] The stirring assembly includes a drive motor 14 and a mounting housing 15. Both the drive motor 14 and the mounting housing 15 are fixedly mounted on the top of the urea dissolving tank 1. A worm gear 27 is rotatably mounted inside the mounting housing 15. A worm 28 is rotatably inserted through the front side of the interior of the mounting housing 15. The worm gear 27 meshes with the worm 28. The output shaft end of the drive motor 14 is fixedly connected to the left end of the worm 28. A rotating rod 29 is fixedly connected to the bottom side of the worm gear 27. The bottom end of the rotating rod 29 rotatably extends into the interior of the urea dissolving tank 1 and is fitted with a rotating tube 18. A slide bar 31 is fixedly connected to the inner wall of the rotating tube 18. A groove 30 is opened on the outer surface of the rotating rod 29. The slide bar 31 is slidably connected to the groove 30. Several stirring rods 19 are fixedly connected to the outer surface of the rotating tube 18. Several stirring blades 20 are fixedly connected to the stirring rods 19. A lifting mechanism is provided on the top side of the rotating tube 18.

[0031] The lifting mechanism includes a fixed sleeve 22, which is fixedly connected to the inner wall of the top side of the urea dissolving tank 1. An annular groove 23 is provided on the inner wall of the fixed sleeve 22. A limit rod 24 is fixedly connected to the outer surface of the rotating tube 18, and the limit rod 24 is slidably connected to the annular groove 23.

[0032] When the stirring assembly is in use, the drive motor 14 is started to drive the worm gear 28 to rotate. Since the worm wheel 27 meshes with the worm gear 28, the worm wheel 27 rotates, which in turn rotates the rotating rod 29. Since the outer surface of the rotating rod 29 has a sliding groove 30, and the inner wall of the rotating tube 18 is fixedly connected to a sliding strip 31, the sliding strip 31 is slidably connected to the sliding groove 30, so that the rotating tube 18 is slidably sleeved on the rotating rod 29, thereby rotating the rotating tube 18. Several stirring rods 19 are fixedly connected to the outer surface of the rotating tube 18, and several stirring blades 20 are fixedly connected to the stirring rods 19 to stir and mix the urea solution in the urea dissolving tank 1. During the stirring process, since the limiting rod 24 is fixedly connected to the outer surface of the rotating tube 18 and is slidably connected to the annular sliding groove 23 opened on the inner wall of the fixed sleeve 22, the rotating tube 18 reciprocates and rises during the rotation, improving the stirring efficiency of the urea solution.

[0033] The ammonia outlet assembly includes two sets of ammonia outlets 8, which are respectively located on the front and rear sides of the top of the hydrolyzer 3. The top of each set of ammonia outlets 8 is fixedly connected to a baffle valve 9. The output ends of the two sets of baffle valves 9 are respectively fixedly connected to ammonia supply main pipe 10 and ammonia supply main pipe 21. The other end of ammonia supply main pipe 21 is fixedly connected to a baffle valve 22. The output end of baffle valve 212 is fixedly connected to ammonia supply main pipe 10 through a pipe.

[0034] When the ammonia outlet assembly is in use, the ammonia gas generated in the hydrolyzer 3 is controlled by one set of baffle valve 9 and enters the ammonia supply main pipe 10 through one set of ammonia outlet 8, thus completing the ammonia outlet. When the ammonia supply main pipe 10 is blocked, the ammonia gas is controlled by another set of baffle valve 9 and enters the ammonia supply main pipe 11 through another set of ammonia outlet 8 to exit the ammonia, thereby avoiding the impact of the ammonia supply pipeline blockage on the safe operation of the unit.

[0035] The output end of outlet valve 6 is fixedly connected to the input end of solution dissolving pump 4 via a pipe. The output end of solution dissolving pump 4 is fixedly connected to urea solution storage tank 2 via a pipe. The output end of outlet valve 7 is fixedly connected to the input end of solution transfer pump 5 via a pipe. The output end of solution transfer pump 5 is fixedly connected to hydrolyzer 3 via a pipe.

[0036] Both the urea dissolving tank 1 and the urea solution storage tank 2 are equipped with steam heating coils 21 on the bottom side of their interiors.

[0037] Thermometers 17 are inserted into both the urea dissolving tank 1 and the urea solution storage tank 2.

[0038] The urea solution inside the urea dissolving tank 1 and the urea solution storage tank 2 is heated by the steam heating coil 21, and the temperature of the urea solution is measured by the thermometer 17 to ensure that the temperature of the urea solution is within a certain range.

[0039] Both the urea dissolving tank 1 and the urea solution storage tank 2 are equipped with submersible level gauges 16 on their tops to measure the urea solution level in the urea dissolving tank 1 and the urea solution storage tank 2.

[0040] The outer surfaces of the urea dissolving tank 1, urea solution storage tank 2, and hydrolyzer 3 are all provided with outlets 25. A sampling valve 26 is fixedly installed on the outlet 25. The sampling valve 26 controls the liquid discharge from the outlet 25, thereby sampling the urea solution in the urea dissolving tank 1, urea solution storage tank 2, and hydrolyzer 3. The chloride ion content and sulfate ion content in the urea solution are tested sequentially and found to be qualified before entering the next equipment, ensuring that the urea solution of each equipment will not be cross-contaminated during the ammonia production process.

[0041] The top of the urea dissolving tank 1 is provided with a water inlet and a feed inlet, through which water and urea raw materials are added.

[0042] Working principle: When the urea-to-ammonia unit is running, water and urea raw materials are added to the urea dissolving tank 1. The drive motor 14 is started to drive the worm gear 28 to rotate. Since the worm wheel 27 meshes with the worm gear 28, the worm wheel 27 rotates, which in turn rotates the rotating rod 29. Since the outer surface of the rotating rod 29 has a sliding groove 30, and the inner wall of the rotating tube 18 is fixedly connected to a sliding strip 31, the sliding strip 31 is slidably connected to the sliding groove 30, so that the rotating tube 18 is slidably sleeved on the rotating rod 29, thereby rotating the rotating tube 18. Several stirring rods 19 are fixedly connected to the outer surface of the rotating tube 18, and several stirring rods 19 are fixedly connected to the stirring rods 19. The blade 20 stirs and mixes the urea solution in the urea dissolving tank 1. During the stirring process, the limiting rod 24, which is fixedly connected to the outer surface of the rotating tube 18, is slidably connected to the annular groove 23 opened on the inner wall of the fixed sleeve 22. This causes the rotating tube 18 to move up and down repeatedly during rotation, improving the stirring efficiency of the urea solution. The mixed urea solution is discharged through the discharge valve 6 and transported to the urea solution storage tank 2 by the solution dissolving pump 4. When ammonia production is required, the discharge is controlled by the discharge valve 7 and the urea solution in the urea solution storage tank 2 is transported to the hydrolyzer 3 by the solution transfer pump 5 for hydrolysis to produce ammonia.

[0043] The ammonia gas produced after hydrolysis in hydrolyzer 3 is controlled by one set of baffle valve 19, and then enters the ammonia supply main pipe 10 through one set of ammonia outlet 8 to complete the ammonia discharge. When the ammonia supply main pipe 10 is blocked, the ammonia gas is controlled by another set of baffle valve 19, and then enters the ammonia supply main pipe 21 through another set of ammonia outlet 8 to discharge ammonia, thereby avoiding the impact of ammonia supply pipeline blockage on the safe operation of the unit.

[0044] Urea dissolving tank 1, urea solution storage tank 2, and hydrolyzer 3 all control the liquid outlet 25 through sampling valve 26, thereby sampling the urea solution in urea dissolving tank 1, urea solution storage tank 2, and hydrolyzer 3. The chloride ion content and sulfate ion content in the urea solution are tested sequentially and qualified before entering the next equipment, ensuring that the urea solution of each equipment will not be cross-contaminated during the ammonia production process.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A urea-to-ammonia unit, comprising a base (13), characterized in that: A urea dissolving tank (1) and a urea solution storage tank (2) are provided on the top left side of the base (13). The urea solution storage tank (2) is located in front of the urea dissolving tank (1). A hydrolyzer (3) is provided on the top right side of the base (13). A liquid outlet valve one (6) and a liquid outlet valve two (7) are fixedly connected to the bottom of the urea dissolving tank (1) and the bottom of the urea solution storage tank (2), respectively. A solution dissolving pump (4) is provided between the urea dissolving tank (1) and the urea solution storage tank (2). A solution transfer pump (5) is provided between the urea solution storage tank (2) and the hydrolyzer (3). A stirring assembly is installed inside the urea dissolving tank (1). An ammonia outlet assembly is provided on the top of the hydrolyzer (3).

2. The urea-to-ammonia unit according to claim 1, characterized in that: The stirring assembly includes a drive motor (14) and a mounting housing (15). Both the drive motor (14) and the mounting housing (15) are fixedly mounted on the top of the urea dissolving tank (1). A worm gear (27) is rotatably mounted inside the mounting housing (15). A worm (28) is rotatably mounted on the front side of the interior of the mounting housing (15). The worm gear (27) meshes with the worm (28). The output shaft of the drive motor (14) is fixedly connected to the left end of the worm (28). A rotating rod (29) is fixedly connected to the bottom side of the worm gear (27). The bottom end of the rotating rod (29) is rotated into the interior of the urea dissolving tank (1) and fitted with a rotating tube (18). A slide bar (31) is fixedly connected to the inner wall of the rotating tube (18). A groove (30) is opened on the outer surface of the rotating rod (29). The slide bar (31) is slidably connected to the groove (30). Several stirring rods (19) are fixedly connected to the outer surface of the rotating tube (18). Several stirring blades (20) are fixedly connected to the stirring rods (19). A lifting mechanism is provided on the top side of the rotating tube (18).

3. A urea-to-ammonia unit according to claim 2, characterized in that: The lifting mechanism includes a fixed sleeve (22), which is fixedly connected to the inner wall of the top side of the urea dissolving tank (1). The inner wall of the fixed sleeve (22) is provided with an annular groove (23). A limit rod (24) is fixedly connected to the outer surface of the rotating tube (18), and the limit rod (24) is slidably connected to the annular groove (23).

4. The urea-to-ammonia unit according to claim 1, characterized in that: The ammonia outlet assembly includes two sets of ammonia outlets (8). The two sets of ammonia outlets (8) are respectively opened on the front and rear sides of the top of the hydrolyzer (3). The top of the two sets of ammonia outlets (8) are fixedly connected to a baffle valve (9). The output ends of the two sets of baffle valves (9) are respectively fixedly connected to ammonia supply main pipe (10) and ammonia supply main pipe (11). The other end of the ammonia supply main pipe (11) is fixedly connected to a baffle valve (12). The output end of the baffle valve (12) is fixedly connected to the ammonia supply main pipe (10) through a pipe.

5. A urea-to-ammonia unit according to claim 1, characterized in that: The output end of the first outlet valve (6) is fixedly connected to the input end of the solution dissolving pump (4) through a pipe. The output end of the solution dissolving pump (4) is fixedly connected to the urea solution storage tank (2) through a pipe. The output end of the second outlet valve (7) is fixedly connected to the input end of the solution transfer pump (5) through a pipe. The output end of the solution transfer pump (5) is fixedly connected to the hydrolyzer (3) through a pipe.

6. A urea-to-ammonia unit according to claim 1, characterized in that: Both the urea dissolving tank (1) and the urea solution storage tank (2) are equipped with steam heating coils (21) on their inner bottom sides.

7. A urea-to-ammonia unit according to claim 1, characterized in that: Thermometers (17) are inserted into both the urea dissolving tank (1) and the urea solution storage tank (2).

8. A urea-to-ammonia unit according to claim 1, characterized in that: Both the urea dissolving tank (1) and the urea solution storage tank (2) are equipped with submersible water level gauges (16) on their tops.

9. A urea-to-ammonia unit according to claim 1, characterized in that: The outer surfaces of the urea dissolving tank (1), the urea solution storage tank (2) and the hydrolyzer (3) are all provided with liquid outlets (25), and a sampling valve (26) is fixedly installed on the liquid outlets (25).

10. A urea-to-ammonia unit according to claim 1, characterized in that: The urea dissolving tank (1) has a water inlet and a feed inlet at the top.

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