Efficient urea dissolving and storing device

Abstract

The utility model relates to the technical field of urea production, in particular to an efficient urea dissolving and storing device. Comprising a dissolving tank, a drain tank and a storage tank, the dissolving tank is communicated with the drain tank and the storage tank, and urea is added into the dissolving tank through a urea tank car and / or a bagged urea crane. The temperature of the urea dissolving tank and the temperature of the urea solution storage tank can be automatically controlled, manual adjustment is not needed, and it is ensured that urea is completely dissolved and no crystallization exists in storage; urea particles are injected into the dissolving tank and urea is rapidly dissolved automatically, and manual operation and loading and unloading are not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of urea production, in particular to a urea efficient dissolving and storing device. Background Art

[0002] The reducing agent used in the denitrification process is ammonia. Currently, ammonia used as a reducing agent is flammable and toxic, and is dangerous during transportation and use. Therefore, thermal decomposition and hydrolysis are mainly used in industrial production to produce ammonia. Whether it is thermal decomposition or hydrolysis of urea, urea needs to be dissolved first. However, the industrial application maturity of urea dissolution is not perfect, and many problems are still encountered during operation. For example, the operation of the urea dissolution process is mainly completed manually, the system cannot be operated automatically, incomplete dissolution occurs during the urea dissolution process, and recrystallization occurs during urea storage.

[0003] The Chinese patent with the announcement date of October 18, 2022 and the announcement number CN217594336U discloses a utility model patent for "a urea pre-dissolution device and an integrated dissolution and storage system". This method is provided with a stirring assembly and a heat exchange assembly in the tank body, and the heat exchange assembly is arranged along the circumference surrounding the stirring assembly. The tank body is provided with a feed inlet, a liquid inlet, a heating medium inlet, a liquid outlet and a heating medium outlet. The heating medium inlet and the heating medium outlet are respectively connected to the heat exchange assembly, thereby achieving the advantages of promoting the rapid dissolution of urea solution and shortening the preparation time and energy consumption. However, the patent does not involve urea dissolution tanks, drain tanks and storage tanks, and cannot realize automatic filling of urea, automatic thermal dissolution and automatic transfer and storage. Utility Model Content

[0004] Therefore, the utility model aims to overcome the technical problems in the prior art, thereby providing a urea efficient dissolving and storing device.

[0005] The utility model provides a urea efficient dissolving and storing device, comprising a dissolving tank, a drain tank and a storage tank, wherein the dissolving tank is respectively connected with the drain tank and the storage tank, and urea is added to the dissolving tank by a urea tank truck and / or a bagged urea crane.

[0006] Furthermore, the urea tank truck adds urea into the dissolving tank through a urea delivery pipe, one end of the urea delivery pipe is connected to the top of the dissolving tank, and the other end of the urea delivery pipe is connected to the urea tank truck; the urea delivery pipe is connected to a compressed air pipe, a fourth manual valve is provided on the compressed air pipe, and one end of the compressed air pipe away from the urea delivery pipe is connected to compressed air. The bagged urea crane adds urea into the dissolving tank through a funnel, and the funnel is located at the top of the dissolving tank and is connected to the inside of the dissolving tank.

[0007] Furthermore, a first stirring rod is provided through the top of the dissolving tank, the first stirring rod is rotatably connected to the top of the dissolving tank, the upper end of the first stirring rod is connected to a first motor, the lower end of the first stirring rod is connected to a first paddle, a first heating heater is provided on the side wall of the dissolving tank, one end of the first heating heater is connected to a steam pipe, the other end of the first heating heater is connected to a first drain pipe, a first electric valve is provided on the steam pipe, the other end of the first drain pipe passes through the top of the drain tank and is directly inserted into the bottom of the drain tank, a first liquid level gauge and a first thermometer are provided in the dissolving tank, and the top of the dissolving tank is connected to an exhaust fan through a pipeline A water supply pipe is provided on the top of the dissolving tank, and a desalted water pipe is connected to one end of the water supply pipe away from the dissolving tank, and a second electric valve is provided on the desalted water pipe. A urea solution outlet pipe is connected to the lower part of the dissolving tank, and one end of the urea solution outlet pipe away from the dissolving tank is connected to the top of the storage tank; a seventh electric valve, a delivery pump and an eighth electric valve are sequentially installed on the urea solution outlet pipe; a urea solution reflux pipe is connected to the urea solution outlet pipe located between the delivery pump and the eighth electric valve, and one end of the urea solution reflux pipe away from the urea solution outlet pipe is connected to the top of the dissolving tank, and a third electric valve is installed on the urea solution reflux pipe.

[0008] Furthermore, a second liquid level gauge is provided in the drain tank, and a drain outlet pipe is connected to the lower part of the drain tank; the end of the drain outlet pipe away from the drain tank is connected to the water supply pipe, and the fourth electric valve, drain pump and fifth electric valve are installed in sequence on the drain outlet pipe.

[0009] Furthermore, a second stirring rod is provided through the top of the storage tank, the second stirring rod is rotatably connected to the top of the storage tank, the upper end of the second stirring rod is connected to a second motor, the lower end of the second stirring rod is connected to a second paddle, a second heating heater is provided on the side wall of the storage tank, one end of the second heating heater is connected to the steam pipeline through a steam pipe, the other end of the second heating heater is connected to a second drain pipe, one end of the second drain pipe away from the second heating heater passes through the top of the drain tank and is directly inserted into the bottom of the drain tank, a sixth electric valve is installed on the steam pipe, and a third liquid level gauge and a second thermometer are provided in the storage tank.

[0010] Furthermore, the upper end of the dissolving tank is connected to a first overflow pipe, the lower end of the dissolving tank is connected to a first bottom drain pipe, the first bottom drain pipe is installed with a first manual valve, the first overflow pipe and the first bottom drain pipe are both connected to the drainage ditch; the upper end of the drain tank is connected to a second overflow pipe, the lower end of the drain tank is connected to a second bottom drain pipe, the second bottom drain pipe is installed with a second manual valve, the second overflow pipe and the second bottom drain pipe are both connected to the drainage ditch.

[0011] Furthermore, a third overflow pipe is connected to the upper end of the storage tank, a third bottom sewage pipe is connected to the lower end of the storage tank, a third manual valve is installed on the third bottom sewage pipe, and the third overflow pipe and the third bottom sewage pipe are both connected to the drainage ditch.

[0012] Furthermore, it also includes a first PLC controller, the first thermometer, the second electric valve and the fifth electric valve are all connected to the first PLC controller, and the first PLC controller is suitable for receiving the signal of the first thermometer and controlling the opening of the second electric valve and the fifth electric valve according to the signal of the first thermometer.

[0013] Furthermore, it also includes a second PLC controller, the first thermometer and the first electric valve are both connected to the second PLC controller, and the second PLC controller is suitable for receiving the signal of the first thermometer and controlling the opening of the first electric valve according to the signal of the first thermometer.

[0014] Furthermore, it also includes a third PLC controller, the second thermometer and the sixth electric valve are both connected to the third PLC controller, and the third PLC controller is suitable for receiving the signal of the second thermometer and controlling the opening of the sixth electric valve according to the signal of the second thermometer.

[0015] The technical solution of the utility model has the following advantages:

[0016] The utility model provides a urea efficient dissolution and storage device, which includes a dissolution tank, a drain tank, a storage tank and other pipelines and valve systems. Urea granules can be transported to the dissolution tank by a urea tank truck or a bagged urea crane; the dissolution tank and the storage tank are both provided with a heat tracing heater and a stirring device, which respectively play the role of completely dissolving the urea granules and ensuring that the urea solution does not crystallize at low temperature; the drain pipes of each heat tracing heater are connected to the top of the drain tank and directly inserted into the bottom of the drain tank to complete the drain transportation to the drain tank; the drain in the drain tank can be reused for the desalted water for dissolving urea; the bottom of the dissolution tank is connected to the top of the dissolution tank and the top of the storage tank respectively through a urea solution reflux pipe and a urea solution outlet pipe. When the urea granules are completely dissolved, the delivery pump can be started to transfer the urea solution from the dissolution tank to the storage tank, and the storage tank is the urea solution to be used.

[0017] The present application can realize automatic control of the temperature of the urea dissolution tank and the temperature of the urea solution storage tank without manual adjustment, thereby ensuring complete dissolution of the urea and no crystallization during storage; the injection of urea granules into the dissolution tank and the rapid dissolution of urea are automatically completed without manual operation and loading and unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] Description of reference numerals;

[0021] 1. Dissolving tank; 2. Drain tank; 3. Storage tank; 4. Urea delivery pipe; 5. Compressed air pipe; 6. Fourth manual valve; 7. Funnel; 8. Urea crane; 9. First stirring rod; 10. First paddle; 11. First motor; 12. First heating heater; 13. Steam pipeline; 14. First drain pipe; 15. First electric valve; 16. Urea solution outlet pipe; 17. Urea solution reflux pipe; 18. Seventh electric valve; 19. Delivery pump; 20. Eighth electric valve; 21. Third electric valve; 22. First thermometer; 23. First liquid level gauge; 24. Exhaust fan; 25. Water supply pipe; 26. Desalted water pipe; 27. Second electric valve; 28. First overflow pipe; 29. ​​First bottom 30. First manual valve; 31. Second level gauge; 32. Second overflow pipe; 33. Second bottom drain pipe; 34. Second manual valve; 35. Drain outlet pipe; 36. Fourth electric valve; 37. Drain pump; 38. Fifth electric valve; 39. Third overflow pipe; 40. Third bottom drain pipe; 41. Third manual valve; 42. Third level gauge; 43. Second thermometer; 44. Second stirring rod; 45. Second motor; 46. Second paddle; 47. Second heating heater; 48. Second drain pipe; 49. Steam pipe; 50. Sixth electric valve; 51. Third PLC controller; 52. Second PLC controller; 53. First PLC controller; 54. Urea tank truck. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Example

[0027] like Figure 1 A specific embodiment of a urea efficient dissolution and storage device is shown, which comprises a dissolution tank 1, a drain tank 2 and a storage tank 3, wherein the dissolution tank 1 is connected to the drain tank 2 and the storage tank 3 respectively, and urea is added to the dissolution tank 1 through a urea tank truck 54 and / or a bagged urea crane 8.

[0028] Furthermore, the urea tank truck 54 adds urea to the dissolving tank 1 through the urea delivery pipe 4, one end of the urea delivery pipe 4 is connected to the top of the dissolving tank 1, and the other end of the urea delivery pipe 4 is connected to the urea tank truck 54; the urea delivery pipe 4 is connected to a compressed air pipe 5, a fourth manual valve 6 is provided on the compressed air pipe 5, and one end of the compressed air pipe 5 away from the urea delivery pipe 4 is connected to compressed air. The bagged urea crane 8 adds urea to the dissolving tank 1 through the funnel 7, and the funnel 7 is located at the top of the dissolving tank 1 and is connected to the inside of the dissolving tank 1.

[0029] Furthermore, a first stirring rod 9 is provided through the top of the dissolving tank 1, and the first stirring rod 9 is rotatably connected to the top of the dissolving tank 1, a first motor 11 is connected to the upper end of the first stirring rod 9, and a first paddle 10 is connected to the lower end of the first stirring rod 9, a first heating heater 12 is provided on the side wall of the dissolving tank 1, one end of the first heating heater 12 is connected to a steam pipe 13, and the other end of the first heating heater 12 is connected to a first drain pipe 14, a first electric valve 15 is provided on the steam pipe 13, and the other end of the first drain pipe 14 passes through the top of the drain box 2 and is directly inserted into the bottom of the drain box 2, a first liquid level gauge 23 and a first thermometer 22 are provided in the dissolving tank 1, and an exhaust fan 24 is connected to the top of the dissolving tank 1 through a pipeline, and the dissolving tank A water supply pipe 25 is provided at the top of the dissolving tank 1, and a desalted water pipe 26 is connected to the end of the water supply pipe 25 away from the dissolving tank 1, and a second electric valve 27 is provided on the desalted water pipe 26. A urea solution outlet pipe 16 is connected to the lower part of the dissolving tank 1, and an end of the urea solution outlet pipe 16 away from the dissolving tank 1 is connected to the top of the storage tank 3; a seventh electric valve 18, a delivery pump 19 and an eighth electric valve 20 are sequentially installed on the urea solution outlet pipe 16; a urea solution reflux pipe 17 is connected to the urea solution outlet pipe 16 located between the delivery pump 19 and the eighth electric valve 20, and an end of the urea solution reflux pipe 17 away from the urea solution outlet pipe 16 is connected to the top of the dissolving tank 1, and a third electric valve 21 is installed on the urea solution reflux pipe 17.

[0030] Furthermore, a second liquid level gauge 31 is provided in the drain tank 2, and a drain outlet pipe 35 is connected to the lower part of the drain tank 2; the end of the drain outlet pipe 35 away from the drain tank 2 is connected to the water supply pipe 25, and the fourth electric valve 36, the drain pump 37 and the fifth electric valve 38 are installed on the drain outlet pipe 35 in sequence.

[0031] Furthermore, a second stirring rod 44 is provided through the top of the storage tank 3, and the second stirring rod 44 is rotatably connected to the top of the storage tank 3. A second motor 45 is connected to the upper end of the second stirring rod 44, and a second paddle 46 is connected to the lower end of the second stirring rod 44. A second heating heater 47 is provided on the side wall of the storage tank 3. One end of the second heating heater 47 is connected to the steam pipe 13 through a steam pipe 49, and the other end of the second heating heater 47 is connected to a second drain pipe 48. One end of the second drain pipe 48 away from the second heating heater 47 passes through the top of the drain tank 2 and is directly inserted into the bottom of the drain tank 2. A sixth electric valve 50 is installed on the steam pipe 49. A third liquid level gauge 42 and a second thermometer 43 are provided in the storage tank 3.

[0032] Furthermore, the upper end of the dissolving tank 1 is connected to a first overflow pipe 28, the lower end of the dissolving tank 1 is connected to a first bottom sewage pipe 29, the first bottom sewage pipe 29 is installed with a first manual valve 30, and the first overflow pipe 28 and the first bottom sewage pipe 29 are both connected to the drainage ditch; the upper end of the drain tank 2 is connected to a second overflow pipe 32, the lower end of the drain tank 2 is connected to a second bottom sewage pipe 33, the second bottom sewage pipe 33 is installed with a second manual valve 34, and the second overflow pipe 32 and the second bottom sewage pipe 33 are both connected to the drainage ditch.

[0033] Furthermore, the upper end of the storage tank 3 is connected to a third overflow pipe 39, and the lower end of the storage tank 3 is connected to a third bottom sewage pipe 40. A third manual valve 41 is installed on the third bottom sewage pipe 40. The third overflow pipe 39 and the third bottom sewage pipe 40 are both connected to the drainage ditch.

[0034] Furthermore, it also includes a first PLC controller 53, and the first thermometer 22, the second electric valve 27 and the fifth electric valve 38 are all connected to the first PLC controller 53. The first PLC controller 53 is suitable for receiving the signal of the first thermometer 22 and controlling the opening of the second electric valve 27 and the fifth electric valve 38 according to the signal of the first thermometer 22.

[0035] Furthermore, it also includes a second PLC controller 52, the first thermometer 22 and the first electric valve 15 are both connected to the second PLC controller 52, and the second PLC controller 52 is suitable for receiving the signal of the first thermometer 22 and controlling the opening of the first electric valve 15 according to the signal of the first thermometer 22.

[0036] Furthermore, it also includes a third PLC controller 51, the second thermometer 43 and the sixth electric valve 50 are both connected to the third PLC controller 51, and the third PLC controller 51 is suitable for receiving the signal of the second thermometer 43 and controlling the opening of the sixth electric valve 50 according to the signal of the second thermometer 43.

[0037] The working process of the above-mentioned urea efficient dissolution and storage device is as follows:

[0038] Water injection into the dissolving tank: Start the first liquid level gauge 23, open the second electric valve 27, and inject deionized water into the dissolving tank 1 through the deionized water pipe 26 and the water supply pipe 25; start the second liquid level gauge 31, if there is a certain level of drain in the drain tank 2, open the fourth electric valve 36 and the fifth electric valve 38, start the drain pump 37, and the drain tank 2 injects drain into the dissolving tank 1 through the drain outlet pipe 35. Start the first thermometer 22, turn on the first PLC controller 53 and set a certain temperature value. The first PLC controller 53 receives the signals of the first thermometer 22, the second electric valve 27 and the fifth electric valve 38, and controls the opening of the second electric valve 27 and the fifth electric valve 38 according to the signal of the first thermometer 22.

[0039] Manually monitor the liquid level of the second liquid level gauge 31. When the liquid level is lower than a certain value, close the fourth electric valve 36, the fifth electric valve 38 and the drain pump 37, and stop the drain tank 2 from injecting drain water into the dissolving tank 1. Manually monitor the first liquid level gauge 23. When the liquid level reaches a certain value, stop injecting desalted water into the dissolving tank 1 through the desalted water pipe 26 and the water supply pipe 25, and close the fourth electric valve 36, the fifth electric valve 38 and the drain pump 37, and stop the drain tank 2 from injecting drain water into the dissolving tank 1. In other words, water is injected into the dissolving tank 1 through the desalted water pipe 26 and the drain tank 2 at the same time. If the liquid level of the drain tank 2 is too low, the water injection of the drain tank 2 is stopped, and the desalted water pipe 26 continues to inject water until the preset liquid level is reached in the dissolving tank 1; if the preset liquid level is reached in the dissolving tank 1 first, both the desalted water pipe 26 and the drain tank 2 are closed at the same time.

[0040] Urea injection into dissolving tank: There are two ways to inject urea into dissolving tank 1, depending on the filling or bagging method of urea. If canned transportation is adopted, the exhaust fan 24 is turned on, one end of the urea delivery pipe 4 is connected to the urea tank truck 54, the fourth manual valve 6 is opened, and compressed air is passed through the compressed air pipe 5 and the urea delivery pipe 4 to the dissolving tank 1. Due to the negative pressure siphon effect in the urea tank truck 54, the urea in the urea tank truck 54 will pass through the urea delivery pipe 4 to the dissolving tank 1. If bagged transportation is adopted, the exhaust fan 24 is turned on, and the bagged urea crane 8 adds bagged urea into the dissolving tank 1 through the funnel 7. According to the set water injection level of the dissolving tank 1, the mass of urea added to the dissolving tank 1 is calculated.

[0041] Urea dissolution: Turn on the first motor 11, and the first motor 11 drives the first blade 10 to stir and dissolve the urea particles and desalted water in the dissolution tank 1 through the first stirring rod 9. Open the first electric valve 15 to a certain degree, and the steam in the steam pipe 13 heats the solution in the dissolution tank 1 through the first heating heater 12, and transports the steam to the drain tank 2 through the first drain pipe 14. Turn on the second PLC controller 52 and set a certain temperature value. The second PLC controller 52 receives the signals of the first thermometer 22 and the first electric valve 15, and controls the opening of the first electric valve 15 according to the signal of the first thermometer 22. When the drain in the drain tank 2 reaches a high liquid level, it can overflow automatically through the second overflow pipe 32.

[0042] Urea solution delivery: After the urea is dissolved for a certain period of time, the eighth electric valve 20 is closed, the seventh electric valve 18 and the third electric valve 21 are opened, and the delivery pump 19 is started, and the urea solution in the dissolution tank 1 is recirculated through the urea solution outlet pipe 16 and the urea solution return pipe 17. After a certain period of circulation, the first manual valve 30 is opened, and the concentration of the urea solution in the dissolution tank 1 is sampled and analyzed from the first bottom sewage pipe 29 and the first overflow pipe 28 connecting the drainage ditch. After the analysis shows that the urea particles are completely dissolved, the eighth electric valve 20 is opened, the third electric valve 21 is closed, and the urea solution in the dissolution tank 1 is delivered to the storage tank 3 through the urea solution outlet pipe 16.

[0043] Urea dissolution and storage: start the third liquid level gauge 42 and the second thermometer 43; turn on the second motor 45, and the second motor 45 drives the second blade 46 to stir the urea solution in the storage tank 3 through the second stirring rod 44. Open the sixth electric valve 50 to a certain degree, and the steam passes through the steam pipe 13 and the steam pipe 49 to the second heating heater 47 to heat the urea solution in the storage tank 3, and transports the steam to the drain tank 2 through the second drain pipe 48. Turn on the third PLC controller 51 and set a certain temperature value. The third PLC controller 51 receives the signals of the second thermometer 43 and the sixth electric valve 50, and controls the opening of the sixth electric valve 50 according to the signal of the second thermometer 43. When the drain in the drain tank 2 reaches a high liquid level, it can overflow automatically through the second overflow pipe 32.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A urea efficient dissolving and storage device, characterized in that: The invention comprises a dissolving tank (1), a drain tank (2) and a storage tank (3), wherein the dissolving tank (1) is connected to the drain tank (2) and the storage tank (3) respectively, and urea is added to the dissolving tank (1) via a urea tank truck (54) and / or a bagged urea crane (8).

2. The urea efficient dissolving and storing device according to claim 1, characterized in that: The urea tank truck (54) adds urea to the dissolving tank (1) through a urea delivery pipe (4); one end of the urea delivery pipe (4) is connected to the top of the dissolving tank (1), and the other end of the urea delivery pipe (4) is connected to the urea tank truck (54); the urea delivery pipe (4) is connected to a compressed air pipe (5); a fourth manual valve (6) is provided on the compressed air pipe (5); one end of the compressed air pipe (5) away from the urea delivery pipe (4) is connected to compressed air; the bagged urea crane (8) adds urea to the dissolving tank (1) through a funnel (7); the funnel (7) is located at the top of the dissolving tank (1) and is connected to the inside of the dissolving tank (1).

3. The urea efficient dissolving and storing device according to claim 1, characterized in that: A first stirring rod (9) is provided through the top of the dissolving tank (1), the first stirring rod (9) is rotatably connected to the top of the dissolving tank (1), the upper end of the first stirring rod (9) is connected to a first motor (11), the lower end of the first stirring rod (9) is connected to a first paddle (10), a first heat tracing heater (12) is provided on the side wall of the dissolving tank (1), one end of the first heat tracing heater (12) is connected to a steam pipe (13), the other end of the first heat tracing heater (12) is connected to a first drain pipe (14), a first electric valve (15) is provided on the steam pipe (13), the other end of the first drain pipe (14) passes through the top of the drain box (2) and is directly inserted into the bottom of the drain box (2), a first liquid level gauge (23) and a first thermometer (22) are provided in the dissolving tank (1), the top of the dissolving tank (1) is connected to an exhaust fan (24) through a pipeline, and the dissolving tank (1) A water supply pipe (25) is arranged at the top of the dissolving tank (1), and a desalted water pipe (26) is connected to the end of the water supply pipe (25) away from the dissolving tank (1), and a second electric valve (27) is arranged on the desalted water pipe (26). A urea solution outlet pipe (16) is connected to the lower part of the dissolving tank (1), and the end of the urea solution outlet pipe (16) away from the dissolving tank (1) is connected to the top of the storage tank (3); a seventh electric valve (18), a delivery pump (19) and an eighth electric valve (20) are sequentially installed on the urea solution outlet pipe (16); a urea solution return pipe (17) is connected to the urea solution outlet pipe (16) located between the delivery pump (19) and the eighth electric valve (20), and the end of the urea solution return pipe (17) away from the urea solution outlet pipe (16) is connected to the top of the dissolving tank (1), and a third electric valve (21) is installed on the urea solution return pipe (17).

4. The urea efficient dissolving and storing device according to claim 3, characterized in that: A second liquid level gauge (31) is arranged in the drain tank (2), and a drain outlet pipe (35) is connected to the lower part of the drain tank (2); one end of the drain outlet pipe (35) away from the drain tank (2) is connected to the water supply pipe (25), and a fourth electric valve (36), a drain pump (37) and a fifth electric valve (38) are sequentially installed on the drain outlet pipe (35).

5. The urea efficient dissolving and storing device according to claim 4, characterized in that: A second stirring rod (44) is provided through the top of the storage tank (3), the second stirring rod (44) is rotatably connected to the top of the storage tank (3), the upper end of the second stirring rod (44) is connected to a second motor (45), the lower end of the second stirring rod (44) is connected to a second paddle (46), a second heating heater (47) is provided on the side wall of the storage tank (3), one end of the second heating heater (47) is connected to the steam pipeline (13) through a steam pipe (49), the other end of the second heating heater (47) is connected to a second drain pipe (48), the end of the second drain pipe (48) away from the second heating heater (47) passes through the top of the drain tank (2) and is directly inserted into the bottom of the drain tank (2), a sixth electric valve (50) is installed on the steam pipe (49), and a third liquid level gauge (42) and a second thermometer (43) are provided in the storage tank (3).

6. The urea efficient dissolving and storing device according to claim 5, characterized in that: The upper end of the dissolving tank (1) is connected to a first overflow pipe (28), the lower end of the dissolving tank (1) is connected to a first bottom sewage pipe (29), the first bottom sewage pipe (29) is installed with a first manual valve (30), and the first overflow pipe (28) and the first bottom sewage pipe (29) are both connected to a drainage ditch; the upper end of the drain tank (2) is connected to a second overflow pipe (32), the lower end of the drain tank (2) is connected to a second bottom sewage pipe (33), the second bottom sewage pipe (33) is installed with a second manual valve (34), and the second overflow pipe (32) and the second bottom sewage pipe (33) are both connected to a drainage ditch.

7. The urea efficient dissolving and storing device according to claim 6, characterized in that: The upper end of the storage tank (3) is connected to a third overflow pipe (39), and the lower end of the storage tank (3) is connected to a third bottom sewage pipe (40). A third manual valve (41) is installed on the third bottom sewage pipe (40). The third overflow pipe (39) and the third bottom sewage pipe (40) are both connected to the drainage ditch.

8. The urea efficient dissolving and storing device according to claim 7, characterized in that: The invention also comprises a first PLC controller (53), wherein the first thermometer (22), the second electric valve (27) and the fifth electric valve (38) are all connected to the first PLC controller (53), and the first PLC controller (53) is suitable for receiving a signal from the first thermometer (22) and controlling the opening of the second electric valve (27) and the fifth electric valve (38) according to the signal from the first thermometer (22).

9. The urea efficient dissolving and storing device according to claim 7, characterized in that: The invention also comprises a second PLC controller (52), the first thermometer (22) and the first electric valve (15) are both connected to the second PLC controller (52), and the second PLC controller (52) is suitable for receiving a signal from the first thermometer (22) and controlling the opening degree of the first electric valve (15) according to the signal from the first thermometer (22).

10. The urea efficient dissolving and storing device according to claim 7, characterized in that: It also includes a third PLC controller (51), the second thermometer (43) and the sixth electric valve (50) are both connected to the third PLC controller (51), and the third PLC controller (51) is suitable for receiving the signal of the second thermometer (43) and controlling the opening of the sixth electric valve (50) according to the signal of the second thermometer (43).

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