System facilitating the maintenance of an acidic water centrifugal pump

Abstract

This utility model relates to the field of oil refining and chemical technology, specifically to a system for facilitating the maintenance of acid water centrifugal pumps. It includes two acid water centrifugal pumps: an acid water centrifugal pump 1 and an acid water centrifugal pump 2. The inlet of the acid water centrifugal pump 1 is connected to an acid water tank via an acid water pipe 1. The outlet of the acid water centrifugal pump 1 is connected to an outlet pipe 1 and a flushing pipe 1. The flushing pipe 1 is connected to a deoxygenated water pipeline via a flushing valve 1 and a deoxygenated water valve 1. A vent valve 1 is located between the flushing valve 1 and the deoxygenated water valve 1. Similarly, the inlet of the acid water centrifugal pump 2 is connected to an acid water tank via an acid water pipe 2. The outlet of the acid water centrifugal pump 2 is connected to an outlet pipe 2 and a flushing pipe 2. The flushing pipe 2 is connected to a deoxygenated water pipeline via a flushing valve 2 and a deoxygenated water valve 2. A vent valve 2 is located between the flushing valve 2 and the deoxygenated water valve 2. This utility model achieves safe and environmentally friendly maintenance without affecting the operation of the acid water centrifugal pumps.

Description

Technical Field

[0001] This utility model relates to the field of oil refining and chemical technology, and specifically to a system that facilitates the maintenance of acidic water centrifugal pumps. Background Technology

[0002] Most petrochemical plants have centrifugal pumps that handle acidic water. During regular maintenance or repairs, these pumps require the acidic water to be drained before operation. The conventional evacuation method is called "pump slinging," which involves closing the inlet and outlet valves of the centrifugal pump and opening the lowest point of the inlet to release the residual acidic water from the pump casing. Because the acidic water pump contains a high concentration of hydrogen sulfide, prolonged use of this method will produce an unpleasant odor, causing a noticeable acidic smell around the pump and polluting the surrounding environment. During drainage, workers collect the acidic water using a drip tray and pour it into a floor drain. This process involves direct or indirect contact with the acidic water medium by maintenance personnel, threatening their health and safety. Utility Model Content

[0003] The technical problem to be solved by this utility model is to propose a system that facilitates the maintenance of acidic water centrifugal pumps. Without affecting the operation of the acidic water centrifugal pump, the system uses high-temperature deoxygenated water for water top and water washing to replace the acidic water in the standby pump and soak the pump body. This not only achieves odorless "pump-off" of the acidic water centrifugal pump, but also realizes safe and environmentally friendly maintenance.

[0004] The system for facilitating the maintenance of acidic water centrifugal pumps according to this utility model includes an acidic water centrifugal pump 1 and an acidic water centrifugal pump 2. The inlet of the acidic water centrifugal pump 1 is connected to an acidic water tank via an acidic water pipe 1. The outlet of the acidic water centrifugal pump 1 is connected to an outlet pipe 1 and a flushing pipe 1. The flushing pipe 1 is connected to a deoxygenated water pipeline via a flushing valve 1 and a deoxygenated water valve 1 in sequence. An vent valve 1 is provided between the flushing valve 1 and the deoxygenated water valve 1. The inlet of the acidic water centrifugal pump 2 is connected to an acidic water tank via an acidic water pipe 2. The outlet of the acidic water centrifugal pump 2 is connected to an outlet pipe 2 and a flushing pipe 2 in sequence. The flushing pipe 2 is connected to a deoxygenated water pipeline via a flushing valve 2 and a deoxygenated water valve 2 in sequence. An vent valve 2 is provided between the flushing valve 2 and the deoxygenated water valve 2.

[0005] Preferably, centrifugal pump inlet valve one and centrifugal pump inlet valve two are respectively provided on acidic water pipe one and acidic water pipe two.

[0006] Preferably, centrifugal pump outlet valve one and centrifugal pump outlet valve two are respectively provided on water outlet pipe one and water outlet pipe two.

[0007] Preferably, a main deoxygenated water valve is installed on the deoxygenated water pipeline.

[0008] Preferably, a blind plate is provided between the first vent valve and the first deoxygenated water valve; a blind plate is provided between the second vent valve and the second deoxygenated water valve.

[0009] Valves can be installed on the pipeline as needed to control the flow of materials within the pipeline. The opening and closing of the valves can be used to conveniently control the flow of materials within the pipeline and to regulate the material flow rate.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] One or two acidic water centrifugal pumps are used as the operating pump, while the other is used as a standby pump. Without affecting the operation of the operating pump, a deoxygenated water top process is added. That is, the acidic water in the pump body is replaced with deoxygenated water. High-temperature deoxygenated water is used for top flushing and water washing to replace the acidic water in the standby pump and soak the pump body. After the pump body is cleaned, the deoxygenated water in the pump body is drained. This not only achieves the goal of odorless "pump slinging" of the acidic water centrifugal pump, but also achieves the goal of no acidic water residue and odor diffusion on site after the fitter disassembles the pump. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] In the diagram: 1. Acidic water centrifugal pump one; 2. Acidic water centrifugal pump two; 3. Acidic water pipe one; 4. Acidic water tank; 5. Outlet pipe one; 6. Flushing pipe one; 7. Deoxygenated water pipeline; 8. Flushing valve one; 9. Deoxygenated water valve one; 10. Vent valve one; 11. Acidic water pipe two; 12. Outlet pipe two; 13. Flushing pipe two; 14. Flushing valve two; 15. Deoxygenated water valve two; 16. Vent valve two; 17. Centrifugal pump inlet valve one; 18. Centrifugal pump inlet valve two; 19. Centrifugal pump outlet valve one; 20. Centrifugal pump outlet valve two; 21. Deoxygenated water main valve; 22. Blind flange one; 23. Blind flange two. Detailed Implementation

[0014] The present invention will now be described clearly and completely with reference to the accompanying drawings.

[0015] like Figure 1 As shown, the system for facilitating the maintenance of the acidic water centrifugal pump includes an acidic water centrifugal pump 1 and an acidic water centrifugal pump 2. The inlet of the acidic water centrifugal pump 1 is connected to an acidic water tank 4 via an acidic water pipe 3. The outlet of the acidic water centrifugal pump 1 is connected to an outlet pipe 5 and a flushing pipe 6. The flushing pipe 6 is connected to a deoxygenated water pipeline 7 via a flushing valve 8 and a deoxygenated water valve 9. An vent valve 10 is provided between the flushing valve 8 and the deoxygenated water valve 9. The inlet of the acidic water centrifugal pump 2 is connected to the acidic water tank 4 via an acidic water pipe 21. The outlet of the acidic water centrifugal pump 2 is connected to an outlet pipe 22 and a flushing pipe 23. The flushing pipe 23 is connected to the deoxygenated water pipeline 7 via a flushing valve 24 and a deoxygenated water valve 25. An vent valve 26 is provided between the flushing valve 24 and the deoxygenated water valve 25.

[0016] Centrifugal pump inlet valve 17 and centrifugal pump inlet valve 218 are respectively installed on acidic water pipe 13 and acidic water pipe 211.

[0017] Centrifugal pump outlet valve 19 and centrifugal pump outlet valve 20 are respectively installed on water outlet pipe 15 and water outlet pipe 212.

[0018] The deoxygenated water pipeline 7 is equipped with a deoxygenated water main valve 21.

[0019] A blind flange 22 is provided between vent valve 10 and deoxygenated water valve 9; a blind flange 23 is provided between vent valve 26 and deoxygenated water valve 25.

[0020] The work process is as follows:

[0021] Using acidic water centrifugal pump 1 as the operating pump and acidic water centrifugal pump 2 as the standby pump, perform water-top maintenance on the standby pump:

[0022] Close centrifugal pump outlet valve 20 and flushing valve 24; close deoxygenated water valve 25, vent valve 26, and deoxygenated water main valve 21; remove blind flange 23; fully open deoxygenated water valve 25 and deoxygenated water main valve 21; slightly open vent valve 26; fill with water to expel air and vent until water is continuously visible for about 2 minutes; then close vent valve 26; slowly open flushing valve 24 to introduce deoxygenated water into acidic water centrifugal pump 22; after washing the pump body, the water flows through centrifugal pump inlet valve 218 and merges with centrifugal pump inlet valve 17, entering acidic water centrifugal pump 1; then it flows through centrifugal pump outlet valve 19 into the outlet flow. This process washes acidic water centrifugal pump 22.

[0023] During the water washing process, the deoxygenated water volume is controlled at 5%-10% of the pump's rated flow rate, approximately 100kg / h-3000kg / h. The deoxygenated water temperature from deoxygenated water pipeline 7 is 90℃, and the acidic water temperature is approximately 40℃. The deoxygenated water volume is controlled at 5%-10% of the pump's rated flow rate. The inlet temperature rise of the acidic water centrifugal pump 1 is 3℃-8℃, and the pump body temperature does not exceed 50℃, which will not affect the operation of the acidic water centrifugal pump 1.

[0024] The washing time is determined by the size of the centrifugal pump and the diameter of the inlet and outlet pipelines. The thicker the pipeline and the larger the pump, the longer the washing soaking time. The inlet and outlet pipelines are generally between φ25-φ80, and the washing time is controlled at about 2-4 hours. The pump body temperature of acidic water centrifugal pump 2 should be controlled >85℃. The deoxygenated water volume or washing time can be appropriately increased according to the pump body temperature to ensure the washing quality. However, the pump body temperature of acidic water centrifugal pump 1, which is the operating pump, should be controlled ≤55℃ to prevent cavitation.

[0025] After the acid water centrifugal pump 22 has finished washing and soaking, close the deoxygenated water main valve 21, deoxygenated water valve 25, and centrifugal pump inlet valve 28 in sequence, and open the empty valve 216 to check whether the washing and soaking is qualified; after confirming that the acid water centrifugal pump 22 has passed the washing and soaking, drain the remaining water through the empty valve 216.

[0026] Finally, close flushing valve 214 and deoxygenated water valve 215, open air valve 216, and restore blind plate 223. Then acidic water centrifugal pump 22 can enter maintenance mode.

[0027] Similarly, acidic water centrifugal pump 2 can be used as the operating pump, and acidic water centrifugal pump 1 can be used as the standby pump, with the standby pump being repaired by water.

Claims

1. A system for facilitating the maintenance of an acidic water centrifugal pump, characterized in that, It includes an acidic water centrifugal pump 1 (1) and an acidic water centrifugal pump 2 (2). The inlet of the acidic water centrifugal pump 1 (1) is connected to the acidic water tank (4) through the acidic water pipe 1 (3). The outlet of the acidic water centrifugal pump 1 (1) is connected to the outlet pipe 1 (5) and the flushing pipe 1 (6) respectively. The flushing pipe 1 (6) is connected to the deoxygenated water pipeline (7) through the flushing valve 1 (8) and the deoxygenated water valve 1 (9) in sequence. A drain valve is provided between the flushing valve 1 (8) and the deoxygenated water valve 1 (9). An empty valve (10) is installed. The inlet of the acidic water centrifugal pump (2) is connected to the acidic water tank (4) through the acidic water pipe (2) (11). The outlet of the acidic water centrifugal pump (2) (2) is connected to the outlet pipe (2) (12) and the flushing pipe (2) (13) respectively. The flushing pipe (2) (13) is connected to the deoxygenated water pipeline (7) through the flushing valve (2) (14) and the deoxygenated water valve (2) (15) in sequence. An empty valve (2) (16) is provided between the flushing valve (2) (14) and the deoxygenated water valve (2) (15).

2. The system for facilitating the maintenance of acidic water centrifugal pumps according to claim 1, characterized in that, Centrifugal pump inlet valve 1 (17) and centrifugal pump inlet valve 2 (18) are respectively installed on acidic water pipe 1 (3) and acidic water pipe 2 (11).

3. The system for facilitating the maintenance of acidic water centrifugal pumps according to claim 1, characterized in that, Centrifugal pump outlet valve 1 (19) and centrifugal pump outlet valve 2 (20) are respectively installed on water outlet pipe 1 (5) and water outlet pipe 2 (12).

4. The system for facilitating the maintenance of acidic water centrifugal pumps according to claim 1, characterized in that, The deoxygenated water pipeline (7) is equipped with a deoxygenated water main valve (21).

5. The system for facilitating the maintenance of acidic water centrifugal pumps according to claim 1, characterized in that, A blind flange 1 (22) is provided between vent valve 1 (10) and deoxygenated water valve 1 (9); a blind flange 2 (23) is provided between vent valve 2 (16) and deoxygenated water valve 2 (15).

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