Sealing and cooling system for urea liquid ammonia pump

Abstract

The invention relates to the technical field of cooling devices, in particular to a urea liquid ammonia pump sealing and cooling system which comprises a plunger pump and is characterized in that a cooling water tank is arranged on one side of the plunger pump, dilute ammonia water with the concentration of 7% is stored in the cooling water tank, the bottom of a sealing water pipe is fixedly communicated with a discharge pipe, and the discharge pipe is communicated with the plunger pump. A discharge valve is installed on the discharge pipe, the outlet end of the discharge pipe is fixedly communicated with the inlet end of a metering pump, the outlet end of the metering pump is fixedly communicated with the inlet end of a plunger pump cooling cavity, and the outlet end of the plunger pump cooling cavity is fixedly communicated with the inlet end of a lifting pump; the outlet end of the lifting pump is fixedly communicated with the inlet end of a recovery pipe, the outlet end of the recovery pipe is correspondingly provided with an upper opening of a cooling box, a cooling device is arranged at the cooling box, and the bottom of the cooling box is fixedly communicated with a guide pipe corresponding to a cooling water tank.

Description

Technical Field

[0001] The invention relates to the technical field of cooling devices, in particular to a urea liquid ammonia pump sealed cooling system. Background Art

[0002] Liquid ammonia is a commonly used raw material in the daily production of urea. During use, liquid ammonia is mainly transported by a plunger pump. At present, the sealing cooling of the plunger pump during operation mainly relies on the circulation of lubricating oil. However, there are certain problems with the use of lubricating oil for circulating cooling. For example, the recycling process of the lubricating oil not only causes oil waste, but also causes environmental pollution. In addition, the heat taken away by the lubricating oil during the circulation process is unstable. Especially after the lubricating oil has been used for a long time, the trace ammonia leaked from the packing cannot be absorbed in time, and the ammonia pump has a strong ammonia smell. The lubricating oil needs to be replaced regularly, which greatly increases the production cost. In this regard, the present application specifically proposes a urea liquid ammonia pump sealing cooling system. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a urea liquid ammonia pump sealed cooling system, which solves the problem. The technical solution is to include a plunger pump, characterized in that a cooling water tank is arranged on one side of the plunger pump, and the cooling water tank is filled with dilute ammonia water with a concentration of 7%. A discharge pipe is fixedly connected to the bottom of the sealed water pipe, and a discharge valve is installed on the discharge pipe. The outlet end of the discharge pipe is fixedly connected to the inlet end of the metering pump, and the outlet end of the metering pump is fixedly connected to the inlet end of the plunger pump cooling chamber. The outlet end of the plunger pump cooling chamber is fixedly connected to the inlet end of the lifting pump, and the outlet end of the lifting pump is fixedly connected to the inlet end of the recovery pipe. The outlet end of the recovery pipe is correspondingly arranged with an upper opening of a cooling box, a cooling device is arranged at the cooling box, and a conduit corresponding to the cooling water tank is fixedly connected to the bottom of the cooling box; The cooling device comprises a longitudinal axis rotatably connected to the side wall of the cold zone box, the longitudinal axis is coaxially fixedly connected to an impeller corresponding to the outlet end of the recovery pipe, a buffer groove located below the impeller is integrally arranged in the cooling box, an overflow plate is integrally connected to the left end of the buffer groove, an overflow groove is integrally arranged on the left end of the overflow plate, a plurality of overflow channels uniformly distributed along the longitudinal direction are opened at the bottom of the overflow groove, a closed partition abutting the overflow groove is fixedly connected to the side wall of the cooling box, a plurality of uniformly distributed conical tubes are embedded in the lower part of the closed partition, a mounting plate is fixedly connected to the inner wall of the cooling box, and a plurality of rotating shafts uniformly distributed along the longitudinal direction are rotatably connected to the mounting plate, the right end of each rotating shaft is respectively fixedly connected to a heat dissipation fan blade, and the left end of each rotating shaft is respectively coaxially fixedly connected to a driven bevel gear, the left end of the cooling box is fixedly connected to a cold air pipe, and a power device driven by the longitudinal axis is arranged on the front side of the cooling box, and the output end of the power device is meshed with each driven bevel gear.

[0004] Preferably, the power device includes a large pulley coaxially fixedly connected to the front end of the longitudinal shaft, the side of the cooling box is rotatably connected to a driven shaft, the driven shaft is coaxially fixedly connected to a plurality of driving bevel gears, the driving bevel gears are meshed with the driven bevel gears one-to-one, the front end of the driven shaft is coaxially fixedly connected to a small pulley corresponding to the large pulley, and the large pulley and the small pulley are connected by a belt.

[0005] Preferably, the discharge pipe is also fixedly connected to a waste pipe, and a waste valve is installed on the waste pipe.

[0006] Preferably, a plurality of evenly distributed guide grooves are provided on the overflow plate.

[0007] The beneficial effects of the present invention are: 1. During use, the present application uses dilute ammonia water in the urea production process as a sealing water medium (i.e., a cooling medium) to circulate and cool the plunger pump. Compared with the traditional cooling method using lubricating oil, dilute ammonia water is a product that is easily obtained in the production process, which greatly reduces the production cost. In addition, the use of dilute ammonia water can also promptly absorb trace ammonia leaked from the filler during the circulating cooling process. With the cyclic use and absorption of the leaked ammonia, the concentration of the dilute ammonia water will gradually increase. When its concentration reaches a certain value, it can be recycled to the analytical hydrolysis system for utilization, which greatly reduces the production cost.

[0008] 2. Furthermore, the present application is provided with a cooling device that can cool down the heated dilute ammonia water, thereby ensuring that the dilute ammonia water can maintain a cooling effect during the recycling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a full cutaway front view of the present invention.

[0010] Figure 2 It is an enlarged view of area A in the full-section main view of the present invention.

[0011] Figure 3 It is an enlarged view of area B in the full-section main view of the present invention.

[0012] Figure 4 This is a three-dimensional cross-sectional view from a first viewing angle of the present invention.

[0013] Figure 5 It is an enlarged view of the C area in the first viewing angle stereoscopic cross-sectional view of the present invention.

[0014] Figure 6 This is a partial stereoscopic view from a second viewing angle of the present invention.

[0015] Figure 7 This is a partial stereoscopic view from the third viewing angle of the present invention.

[0016] Figure 8This is a stereoscopic view from a fourth viewing angle of the present invention.

[0017] Reference numerals 1. Piston pump, 2. Cooling water tank, 3. Discharge pipe, 4. Discharge valve, 5. Metering pump, 6. Lifting pump, 7. Recovery pipe, 8. Cooling box, 9. Cooling device, 10. Conduit, 11. Longitudinal axis, 12. Impeller, 13. Buffer tank, 14. Overflow plate, 15. Overflow tank, 16. Overflow channel, 17. Closed partition, 18. Conical pipe, 19. Mounting plate, 20. Rotating shaft, 21. Cooling fan blade, 22. Driven bevel gear, 23. Cooling pipe, 24. Power unit, 25. Large pulley, 26. Driven shaft, 27. Driving bevel gear, 28. Small pulley, 29. Waste pipe, 30. Waste valve, 31. Guide groove, 32. Belt. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-8 The specific implementation modes of the present invention are further described in detail.

[0019] Embodiment 1, the technical solution is that during use, the present application uses dilute ammonia water in the urea production process as a sealing water medium (i.e., a cooling medium) to circulate and cool the plunger pump 1. Compared with the traditional cooling method using lubricating oil, dilute ammonia water is a product that is easily obtained during the production process, which greatly reduces the production cost. In addition, the use of dilute ammonia water can also timely absorb the trace ammonia leaked from the filler during the circulating cooling process. With the circulation and absorption of the leaked ammonia, the concentration of dilute ammonia water will gradually increase. When its concentration reaches a certain value, it can be recycled to the analytical hydrolysis system for use, which greatly reduces the production cost. Furthermore, the present application is provided with a cooling device 9 that can cool the heated dilute ammonia water, thereby ensuring that the dilute ammonia water can maintain a cooling effect during the circulation process.

[0020] Embodiment 2, based on embodiment 1, specifically, when the present application is in use, a certain amount of dilute ammonia water with a concentration of 7% is stored in the cooling water tank 2 or the sealed water tank. When performing cooling operations, the discharge valve 4 and the metering pump 5 on the discharge pipe 3 are opened, and the lifting pump 6 is started, while ensuring that the waste valve 30 on the waste pipe 29 is closed, thereby ensuring that the circulating cooling is carried out. The metering pump 5 uniformly transports the dilute ammonia water in the cooling water tank 2 to the cooling chamber of the plunger pump 1 according to the set flow rate, thereby cooling the plunger pump 1. After the dilute ammonia water cools the plunger pump 1 through the cooling chamber, the temperature will rise, and then it will be transported to the cooling box 8 through the recovery pipe 7 under the action of the lifting pump 6. The cooling box 8 is provided with a cooling device 9 to cool the dilute ammonia water, thereby ensuring that the dilute ammonia water can maintain a cooling effect during the circulation process.

[0021] Specifically, when the cooling device 9 is working, the cooling pipe is externally connected to the refrigeration device in the factory area. Its specific structure will not be described in detail in this application. The refrigeration device transports cold air to the cooling box 8 through the cold air pipe 23 to cool the dilute ammonia water. The dilute ammonia water with increased temperature will be discharged from the outlet end of the recovery pipe 7 through the action of the lifting pump 6. The discharged dilute ammonia water will impact the impeller 12 and fall into the buffer tank 13. As the liquid level in the buffer tank 13 rises, the dilute ammonia water will enter the overflow tank 15 through the overflow plate 14. After entering the guide tank 31, the dilute ammonia water will fall through the overflow hole in the shape of a water curtain. The water curtain is formed by overflow. The water curtain is relatively thin, which can improve the efficiency of cooling the dilute ammonia water. In addition, such a setting can also greatly reduce the scouring of the equipment caused by directly dumping the dilute ammonia water, thereby improving the service life of the equipment. At the same time, when the dilute ammonia water impacts the impeller 12 through the recovery pipe 7, it will drive the rotating shaft 20 to rotate. The rotation of the rotating shaft 20 will drive the power device 24 through the large pulley 25. Specifically, the rotation of the rotating shaft 20 will cause the large pulley 25 to rotate, and the large pulley 25 will drive the driven shaft 26 to rotate through the belt 32 and the small pulley 28. When the driven shaft 26 rotates, the driving bevel gear 27 will rotate synchronously. The rotation of the driving bevel gear 27 will drive the rotating shafts 20 on the mounting plates 19 to rotate through the driven bevel gear 22, and then the heat dissipation fan blades 21 will also rotate synchronously with the rotating shaft 20. The heat dissipation fan blades 21 rotate The cold air in the cooling box 8 is blown through the conical tube 18 and acts on the water curtain, thereby cooling the water curtain (i.e., dilute ammonia water). The uniformly distributed conical tubes 18 not only facilitate the uniform action of the cold air on the water curtain, but also the physical structure of the conical tube 18 can further reduce the internal energy of the cold air through the conical tube 18, thereby further reducing the stability of the cold air, thereby further improving the cooling efficiency of the dilute ammonia water curtain by the cold air. The outlet of the conduit 10 is connected to the cooling water tank 2, and the cooled dilute ammonia water returns to the cooling water tank 2 through the conduit 10 for circulation cooling. The closed partition 17 facilitates partitioning in the cooling box 8 and the utilization of the cold air. The guide groove 31 on the overflow plate 14 facilitates uniform overflow.

[0022] Embodiment 3, on the basis of embodiment 2, the dilute ammonia water in the cooling water tank 2 is sampled and tested regularly. When the current concentration rises to a certain value, the discharge valve 4 is closed and the waste valve 30 is opened. The dilute ammonia water with increased concentration can be transported to the analytical hydrolysis system or other processes through the waste pipe 29, and the dilute ammonia water can be reused.

Claims

1. A urea liquid ammonia pump sealed cooling system, comprising a plunger pump (1), characterized in that: A cooling water tank (2) is arranged on one side of the plunger pump (1), and the cooling water tank (2) is filled with diluted ammonia water with a concentration of 7%. A discharge pipe (3) is fixedly connected to the bottom of the sealed water pipe, and a discharge valve (4) is installed on the discharge pipe (3). The outlet end of the discharge pipe (3) is fixedly connected to the inlet end of a metering pump (5), and the outlet end of the metering pump (5) is fixedly connected to the inlet end of the cooling chamber of the plunger pump (1). The outlet end of the cooling chamber of the plunger pump (1) is fixedly connected to the inlet end of a lift pump (6), and the outlet end of the lift pump (6) is fixedly connected to the inlet end of a recovery pipe (7). The outlet end of the recovery pipe (7) is arranged corresponding to the upper opening of a cooling box (8), and a cooling device (9) is arranged at the cooling box (8). The bottom of the cooling box (8) is fixedly connected to a conduit (10) corresponding to the cooling water tank (2); The cooling device (9) comprises a longitudinal axis (11) rotatably connected to the side wall of the cold zone box, the longitudinal axis (11) being coaxially fixedly connected to an impeller (12) corresponding to the outlet end of the recovery pipe (7), a buffer tank (13) located below the impeller (12) being integrally arranged in the cooling box (8), an overflow plate (14) being integrally connected to the left end of the buffer tank (13), an overflow tank (15) being integrally arranged to the left end of the overflow plate (14), a plurality of overflow channels (16) uniformly distributed in the longitudinal direction being provided at the bottom of the overflow tank (15), a closed partition plate (17) abutting against the overflow tank (15) being fixedly connected to the side wall of the cooling box (8), the closed partition plate (17) 17) The lower part is embedded with a plurality of evenly distributed conical tubes (18), the inner wall of the cooling box (8) is fixedly connected with a mounting plate (19), the mounting plate (19) is rotatably connected with a plurality of rotating shafts (20) evenly distributed along the longitudinal direction, the right end of each rotating shaft (20) is respectively fixedly connected with a heat dissipation fan blade (21), the left end of each rotating shaft (20) is respectively coaxially fixedly connected with a driven bevel gear (22), the left end of the cooling box (8) is fixedly connected with a cold air pipe (23), and the front side of the cooling box (8) is arranged with a power device (24) driven by the longitudinal shaft (11), and the output end of the power device (24) is meshed with each driven bevel gear (22).

2. The urea liquid ammonia pump sealed cooling system according to claim 1, characterized in that: The power device (24) comprises a large pulley (25) coaxially fixedly connected to the front end of the longitudinal shaft (11); a driven shaft (26) is rotatably connected to the side of the cooling box (8); a plurality of active bevel gears (27) are coaxially fixedly connected to the driven shaft (26); the active bevel gears (27) are meshed with the driven bevel gears (22) in a one-to-one correspondence; a small pulley (28) corresponding to the large pulley (25) is coaxially fixedly connected to the front end of the driven shaft (26); the large pulley (25) and the small pulley (28) are connected via a belt (32).

3. The urea liquid ammonia pump sealed cooling system according to claim 1, characterized in that: The discharge pipe (3) is also fixedly connected to a waste discharge pipe (29), and a waste discharge valve (30) is installed on the waste discharge pipe (29).

4. The urea liquid ammonia pump sealed cooling system according to claim 1, characterized in that: The overflow plate (14) is provided with a plurality of evenly distributed guide grooves (31).

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