A urea liquid ammonia pump seal cooling system

Abstract

This invention relates to the field of cooling device technology, and in particular to a sealed cooling system for a urea liquid ammonia pump, comprising a plunger pump. The system is characterized by a cooling water tank arranged on one side of the plunger pump, the cooling water tank containing 7% dilute ammonia solution, a drain pipe fixedly connected to the bottom of a sealed water pipe, a drain valve installed on the drain pipe, a metering pump inlet fixedly connected to the outlet end of the drain pipe, a metering pump outlet fixedly connected to the inlet end of the plunger pump cooling chamber, a booster pump outlet fixedly connected to the inlet end of the booster pump outlet fixedly connected to the inlet end of a recovery pipe, a cooling tank opening corresponding to the outlet end of the recovery pipe, a cooling device arranged in the cooling tank, and a conduit corresponding to the cooling water tank fixedly connected to the bottom of the cooling tank.

Description

Technical Field

[0001] This invention relates to the field of cooling device technology, and in particular to a sealed cooling system for a urea liquid ammonia pump. Background Technology

[0002] Liquid ammonia is a commonly used raw material in the daily production of urea. During use, liquid ammonia is mainly transported by plunger pumps. Currently, the sealing and cooling of plunger pumps during operation mainly relies on the circulation of lubricating oil. However, there are certain problems with using lubricating oil for circulation and cooling. For example, the circulation of lubricating oil not only wastes oil but also causes environmental pollution. Furthermore, the heat carried away by the lubricating oil during circulation is unstable. In particular, after long-term use of lubricating oil, the trace amounts of ammonia leaking from the packing cannot be absorbed in time, resulting in a strong ammonia odor from the ammonia pump. Regular replacement of the lubricating oil is required, which greatly increases production costs. In response to this, this application proposes a sealing and cooling system for a urea liquid ammonia pump. Summary of the Invention

[0003] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a urea liquid ammonia pump sealing and cooling system. The solution includes a plunger pump, characterized in that a cooling water tank is arranged on one side of the plunger pump, the cooling water tank stores 7% dilute ammonia water, a discharge pipe is fixedly connected to the bottom of a sealing water pipe, a discharge valve is installed on the discharge pipe, the outlet end of the discharge pipe is fixedly connected to the inlet end of a metering pump, 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 a booster pump, the outlet end of the booster pump is fixedly connected to the inlet end of a recovery pipe, the outlet end of the recovery pipe has a corresponding upper opening of a cooling tank, a cooling device is arranged at the cooling tank, and a conduit corresponding to the cooling water tank is fixedly connected to the bottom of the cooling tank.

[0004] The cooling device includes a longitudinal shaft rotatably connected to the side wall of the cooling box. An impeller corresponding to the outlet end of the recovery pipe is coaxially fixedly connected to the longitudinal shaft. A buffer tank located below the impeller is integrally arranged inside the cooling box. An overflow plate is integrally connected to the left end of the buffer tank. An overflow groove is integrally arranged at the left end of the overflow plate. Multiple overflow channels are evenly distributed longitudinally at the bottom of the overflow groove. A closed partition plate abutting against the overflow groove is fixedly connected to the side wall of the cooling box. Several evenly distributed tapered tubes are embedded in the lower part of the closed partition plate. An installation plate is fixedly connected to the inner wall of the cooling box. Multiple rotating shafts evenly distributed longitudinally are rotatably connected to the installation plate. A cooling fan blade is fixedly connected to the right end of each rotating shaft. A driven bevel gear is coaxially fixedly connected to the left end of each rotating shaft. A cold air pipe is fixedly connected to the left end of the cooling box. A power device driven by the longitudinal shaft is arranged at the front of the cooling box. The output end of the power device meshes with each driven bevel gear.

[0005] Preferably, the power unit includes a large pulley fixedly connected to the front end of the longitudinal shaft, a driven shaft rotatably connected to the side of the cooling box, a plurality of driving bevel gears fixedly connected to the driven shaft, the driving bevel gears meshing with the driven bevel gears one to one, a small pulley corresponding to the large pulley fixedly connected to the front end of the driven shaft, and the large pulley and the small pulley connected by a belt.

[0006] Preferably, the discharge pipe is also fixedly connected to a waste discharge pipe, and a waste discharge valve is installed on the waste discharge pipe.

[0007] Preferably, the overflow plate has several evenly distributed guide grooves.

[0008] The beneficial effects of this invention are:

[0009] 1. In the process of use, this application uses dilute ammonia water from the urea production process as a sealing water medium (i.e., cooling medium) to circulate and cool the plunger pump. Compared with the traditional use of lubricating oil for cooling, dilute ammonia water is an easily obtained product in the production process, which greatly reduces the production cost. In addition, the use of dilute ammonia water for circulation cooling can also absorb the trace amounts of ammonia leaked from the packing in a timely manner. With the circulation and absorption of leaked ammonia, the concentration of dilute ammonia water will gradually increase. When its concentration reaches a certain value, it can be recycled to the hydrolysis system for reuse, which greatly reduces the production cost.

[0010] 2. Furthermore, this application includes 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. Attached Figure Description

[0011] Figure 1 This is a full sectional front view of the present invention.

[0012] Figure 2 This is an enlarged view of region A in the full sectional front view of the present invention.

[0013] Figure 3 This is an enlarged view of region B in the full sectional front view of the present invention.

[0014] Figure 4 This is a first-view perspective sectional view of the present invention.

[0015] Figure 5 This is an enlarged view of region C in the first-view stereoscopic sectional view of the present invention.

[0016] Figure 6 This is a partial stereoscopic view from a second perspective of the present invention.

[0017] Figure 7 This is a partial stereoscopic view from a third perspective of the present invention.

[0018] Figure 8 This is a fourth-angle stereoscopic view of the present invention.

[0019] Figure Labels

[0020] 1. Plunger pump, 2. Cooling water tank, 3. Discharge pipe, 4. Discharge valve, 5. Metering pump, 6. Booster pump, 7. Recovery pipe, 8. Cooling box, 9. Cooling device, 10. Pipe, 11. Longitudinal shaft, 12. Impeller, 13. Buffer tank, 14. Overflow plate, 15. Overflow groove, 16. Overflow channel, 17. Enclosed baffle, 18. Tapered tube, 19. Mounting plate, 20. Rotating shaft, 21. Radiator fan blade, 22. Driven bevel gear, 23. Cooling air pipe, 24. Power unit, 25. Large pulley, 26. Driven shaft, 27. Driving bevel gear, 28. Small pulley, 29. Waste discharge pipe, 30. Waste discharge valve, 31. Guide groove, 32. Belt. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1-8 The specific embodiments of the present invention will be described in further detail.

[0022] In Example 1, the technical solution is as follows: During use, dilute ammonia water from the urea production process is used as the sealing water medium (i.e., cooling medium) to circulate and cool the plunger pump 1. Compared to the traditional method of using lubricating oil for cooling, dilute ammonia water is an easily obtainable product in the production process, greatly reducing production costs. Furthermore, the use of dilute ammonia water during circulation cooling can also absorb trace amounts of ammonia leaking from the packing material. With repeated use and absorption of leaked ammonia, the concentration of dilute ammonia water will gradually increase. When its concentration reaches a certain value, it can be recycled to the hydrolysis system for reuse, significantly reducing production costs. Further, this application includes a cooling device 9 to cool the heated dilute ammonia water, thereby ensuring that the dilute ammonia water maintains its cooling effect during circulation.

[0023] In Example 2, based on Example 1, specifically, during use, the cooling water tank 2, or sealed water tank, contains a certain amount of dilute ammonia water with a concentration of 7%. During cooling operations, the discharge valve 4 on the discharge pipe 3 and the metering pump 5 are opened, and the booster pump 6 is started. Simultaneously, the waste discharge valve 30 on the waste discharge pipe 29 is kept closed to ensure circulating cooling. The metering pump 5 delivers the dilute ammonia water from the cooling water tank 2 to the cooling chamber of the plunger pump 1 at a set flow rate, thereby cooling the plunger pump 1. After the dilute ammonia water cools the plunger pump 1 through the cooling chamber, its temperature rises. Then, under the action of the booster pump 6, it is transported to the cooling tank 8 through the recovery pipe 7. The cooling tank 8 is equipped with a cooling device 9 to cool the dilute ammonia water, thus ensuring that the dilute ammonia water maintains its cooling effect during circulation.

[0024] Specifically, when the cooling device 9 is in operation, the cooling pipe is connected to the refrigeration unit in the plant area. Its specific structure will not be described in detail in this application. The refrigeration unit delivers 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 is discharged from the outlet end of the recovery pipe 7 by the action of the booster 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 in the form of a water curtain through the overflow hole. The water curtain is relatively thin due to the overflow, which can improve the efficiency of cooling the dilute ammonia water. In addition, this setting can also greatly reduce the scouring of the equipment caused by directly pouring dilute ammonia water and improve the service life of the equipment. Simultaneously, 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 unit 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. The rotation of the driven shaft 26 will cause the driving bevel gear 27 to rotate synchronously. The rotation of the driving bevel gear 27 will drive the rotating shafts 20 on each mounting plate 19 to rotate through the driven bevel gear 22. Consequently, the cooling fan blades 21 will also rotate synchronously with the rotating shaft 20. The cooling 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 evenly distributed conical tubes 18 not only facilitate the uniform application of cooling air to the water curtain, but also, due to their physical structure, further reduce the internal energy of the cooling air as it passes through, thus further reducing its stability and improving the cooling efficiency of the dilute ammonia water curtain. 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 enclosed partition 17 facilitates the partitioning of the cooling box 8 and the utilization of the cooling air. The guide groove 31 on the overflow plate 14 facilitates uniform overflow.

[0025] In Example 3, based on Example 2, the dilute ammonia water in the cooling water tank 2 is sampled and tested periodically. When the concentration rises to a certain value, the discharge valve 4 is closed and the waste discharge valve 30 is opened. The dilute ammonia water with increased concentration can then be transported to the hydrolysis system or other processes through the waste discharge pipe 29, so that the dilute ammonia water can be reused.

Claims

1. A urea liquid ammonia pump sealing and 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). The cooling water tank (2) contains dilute ammonia water with a concentration of 7%. A discharge pipe (3) is fixedly connected to the bottom of the sealed water pipe. 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 the metering pump (5). 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 the booster pump (6). The outlet end of the booster pump (6) is fixedly connected to the inlet end of the recovery pipe (7). The outlet end of the recovery pipe (7) is correspondingly arranged with the upper opening of the cooling box (8). A cooling device (9) is arranged at the cooling box (8). The bottom of the cooling box (8) is fixedly connected to the conduit (10) corresponding to the cooling water tank (2). The cooling device (9) includes a longitudinal shaft (11) rotatably connected to the side wall of the cold zone box. The longitudinal shaft (11) is 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) is integrally arranged inside the cooling box (8). An overflow plate (14) is integrally connected to the left end of the buffer tank (13). An overflow trough (15) is integrally arranged at the left end of the overflow plate (14). Multiple overflow channels (16) are evenly distributed longitudinally at the bottom of the overflow trough (15). A closed partition (17) abutting against the overflow trough (15) is fixedly connected to the side wall of the cooling box (8). 17) Several evenly distributed tapered tubes (18) are embedded in the lower part. A mounting plate (19) is fixedly connected to the inner wall of the cooling box (8). The mounting plate (19) is rotatably connected to a number of longitudinally evenly distributed rotating shafts (20). Each rotating shaft (20) is fixedly connected to a heat dissipation fan blade (21) on its right end. Each rotating shaft (20) is fixedly connected to a driven bevel gear (22) on its left end. The left end of the cooling box (8) is fixedly connected to a cold air pipe (23). A power device (24) driven by a longitudinal shaft (11) is arranged on the front side of the cooling box (8). The output end of the power device (24) meshes with each driven bevel gear (22).

2. The urea liquid ammonia pump sealing and cooling system according to claim 1, characterized in that, The power unit (24) includes a large pulley (25) coaxially fixedly connected to the front end of the longitudinal shaft (11). The side of the cooling box (8) is rotatably connected to a driven shaft (26). The driven shaft (26) is coaxially fixedly connected to a plurality of driving bevel gears (27). The driving bevel gears (27) mesh with the driven bevel gears (22) one by one. The front end of the driven shaft (26) is coaxially fixedly connected to a small pulley (28) corresponding to the large pulley (25). The large pulley (25) and the small pulley (28) are connected by a belt (32).

3. The urea liquid ammonia pump sealing and 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 sealing and cooling system according to claim 1, characterized in that, The overflow plate (14) has several evenly distributed guide grooves (31).

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