Online cleaning pipeline for chilled water pipeline of air separation unit
By designing the online cleaning pipeline of the chilled water pipeline of the air separation unit, using water treatment methods and special chemicals, the problem of low-temperature scaling has been solved, the equipment operation time has been extended, and maintenance costs and downtime have been reduced.
Patent Information
- Application Number
- CN202421187509.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-01-21
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The refrigeration water pipes of the air-subdivided unit are affected by the cooling and heat transfer of the freezer due to low temperature scaling, which increases operating power consumption and requires frequent maintenance and replacement of pipelines, which increases maintenance costs and downtime.
An online cleaning pipeline for chilled water pipelines of air separation units is designed. By setting up air cooling towers, water inlet pipelines, chilled water pipelines, pickling pipelines and chemical tanks, water treatment methods and special water treatment chemicals are used to achieve the cooling of low-temperature pipelines. Corrosion and scale prevention.
It effectively solves the problem of low-temperature scaling, extends the continuous operation time of the equipment, reduces maintenance costs and downtime, and improves the cooling effect of chilled water on the processing air.
Smart Images
Figure CN222378914U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of air separation unit equipment, and in particular relates to an online cleaning pipeline for a chilled water pipeline of an air separation unit. Background Art
[0002] Air separation units are key auxiliary equipment in the metallurgical and chemical industries, providing industrial gas media such as oxygen, nitrogen, and argon for production. The precooling system is mainly used to cool and wash the processed air. Among them, a refrigerator is configured in the chilled water pipeline to cool the circulating water at about 20°C to about 10°C, and then cool the processed air, which is an important source of cooling capacity for the precooling system.
[0003] In the process of circulating water quality management, if relevant water quality indicators such as calcium and alkaline ions fluctuate, the circulating water with excessive water quality will easily have low-temperature crystallization problems after being cooled by the refrigerator. Low-temperature scale will form on the chilled water pipe, affecting the cooling and heat transfer of the refrigerator and the circulation of circulating water, thereby causing the operating power consumption of the air separation unit to increase.
[0004] The low-temperature water pipes are scaled, which affects the cooling and heat transfer of the refrigerator, and the scale in the pipes affects the water flow. At this time, it is necessary to increase the cooling setting value of the refrigerator, from 10℃ to 8℃, or even lower; for the chilled water pump, increase the operating frequency of the motor, increase the outlet pressure of the water pump, and increase the water flow; when the low-temperature pipes are seriously scaled, it is necessary to shut down for inspection and replace new pipes and valves.
[0005] The existing equipment has the following problems in the air distribution unit:
[0006] 1. The lowering of the temperature setting value of the refrigerator and the increasing of the operating frequency of the chilled water pump are the main reasons for the increase in the power consumption of the moving equipment. At the same time, the cooling effect of the chilled water on the processed air is poor, which affects the operating stability and economy of the entire air separation unit;
[0007] 2. Inspection and replacement of water pipes increases equipment maintenance, material, labor and other costs, and affects the operating time of the unit and subsequent users.
[0008] Therefore, an online cleaning pipeline for chilled water pipelines of an air separation unit is proposed. Utility Model Content
[0009] The utility model aims to provide an online cleaning pipeline for the chilled water pipeline of an air separation unit, which uses water treatment to clean and descale the pipeline, adds special water treatment agents, realizes corrosion and scale inhibition of low-temperature pipelines, and solves the deterioration of low-temperature scaling problems in the prior art, thereby solving the problem of long-term passive shutdown caused by equipment pipeline replacement.
[0010] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the utility model provides an online cleaning pipeline for the chilled water pipeline of an air separation unit, including an air-cooling tower, an air inlet pipeline is arranged on one side of the air-cooling tower, an air outlet pipeline is arranged on the top of the air-cooling tower, a return water pipeline is arranged on one side of the bottom of the air-cooling tower, a water inlet pipeline is arranged on one side of the air-cooling tower, the water inlet pipeline is connected to the circulating water pipeline, a normal temperature water pump is arranged on the circulating water pipeline, a chilled water pipeline is arranged on the top of the air-cooling tower, the chilled water pipeline is connected to a freezer, a connecting pipeline is led out of the freezer, the connecting pipeline is connected to the bottom of the water-cooling tower, a chilled water pump and a connecting valve are arranged on the connecting pipeline, a pickling pipeline is led out of the connecting pipeline and connected to a medicine box, a medicine pump and a pickling valve are arranged on the pickling pipeline, and a collecting pipeline is led out of the medicine box and connected to the bottom of the air-cooling tower.
[0011] Preferably, a return valve is provided on the return water pipe.
[0012] Preferably, a water inlet valve is provided on the water inlet pipe.
[0013] Preferably, a chilled water valve is provided on the chilled water pipeline.
[0014] Preferably, a valve is connected to the connecting pipeline.
[0015] Preferably, a collecting valve is provided on the collecting pipe.
[0016] Preferably, a water inlet pipe is provided at the top of the water cooling tower, and a water inlet valve is provided on the water inlet pipe.
[0017] Preferably, an overflow pipe is provided on one side of the water cooling tower, and the overflow pipe is connected to the drainage ditch.
[0018] Preferably, a processing pipeline is led out from the overflow pipe, the processing pipeline is connected to the processing agent barrel, and a pressure pump is arranged on the processing pipeline.
[0019] Compared with the prior art, the advantages and positive effects of the utility model are:
[0020] 1. The utility model is equipped with a special interface and valve to realize the bypass circulation of water treatment chemicals. For the scaling problem that has become a fact, it can effectively clean and treat it, and install targeted chemical adding equipment to realize the simultaneous production and maintenance, thereby extending the continuous operation time of the equipment;
[0021] 2. The utility model uses water treatment to clean and descale the pipeline, adds special water treatment agents, and achieves corrosion and scale inhibition of low-temperature pipelines, thereby solving the deterioration of low-temperature scaling problems in the prior art, and thus solving the problem of long-term passive shutdown caused by equipment pipeline replacement. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.
[0023] Figure 1 It is a structural schematic diagram of an online cleaning pipeline for a chilled water pipeline of an air separation unit;
[0024] In the above figure, 1. air cooling tower, 2. air inlet pipe, 3. air outlet pipe, 4. return pipe, 5. return valve, 6. water inlet pipe, 7. circulating water pipe, 8. water inlet valve, 9. normal temperature water pump, 10. chilled water pipe, 11. refrigerator, 12. chilled water valve, 13. connecting pipe, 14. water cooling tower, 15. chilled water pump, 16. connecting valve, 17. pickling pipe, 18. chemical pump, 19. pickling valve, 20. chemical box, 21. collecting pipe, 22. collecting valve, 23. water inlet pipe, 24. water inlet valve, 25. overflow pipe, 26. drainage ditch, 27. treatment pipe, 28. treatment chemical barrel, 29. booster pump. DETAILED DESCRIPTION
[0025] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.
[0027] Embodiment 1, as Figure 1 As shown, an online cleaning pipeline of a chilled water pipeline 10 of an air separation unit includes an air cooling tower 1. The air cooling tower 1 is a core device for heat exchange, which is used to cool circulating water, remove heat through natural or forced convection of air, and reduce the water temperature. An air inlet pipe 2 is arranged on one side of the air cooling tower 1, and an air outlet pipe 3 is arranged on the top of the air cooling tower 1. The air inlet pipe 2 and the air outlet pipe 3 guide external air into the air cooling tower 1 for heat exchange, and discharge hot air to ensure cooling efficiency. A return water pipe 4 is arranged on one side of the bottom of the air cooling tower 1. After the circulating water undergoes heat exchange, it returns to the air cooling tower 1 through the return water pipe 4 for circulation.
[0028] A water inlet pipe 6 is provided on one side of the air cooling tower 1 to supply normal temperature water into the air cooling tower 1 for primary cooling. The water inlet pipe 6 is connected to a circulating water pipe 7 to receive external circulating water. A normal temperature water pump 9 is provided on the circulating water pipe 7 to pump the normal temperature circulating water in the circulating water pipe 7 into the water inlet pipe 6 and into the air cooling tower 1. A chilled water pipe 10 is provided on the top of the air cooling tower 1 to transport low temperature chilled water into the air cooling tower 1. The chilled water pipe 10 is connected to a refrigerator 11, and a connecting pipe 13 is led out of the refrigerator 11. The connecting pipe 13 is connected to the bottom of the water cooling tower 14. The connecting pipe 13 leads the water in the water cooling tower 14 to the refrigerator 11 for cooling and then is sent into the air cooling tower 1 through the cold water pipe. A chilled water pump 15 and a connecting valve 16 are provided on the connecting pipe 13. The chilled water pump 15 provides the power for water transportation. The connecting valve 16 can control the opening and closing of the connecting pipe 13 and the flow rate in the connecting pipe 13.
[0029] A pickling pipe 17 is led out from the connecting pipe 13 and connected to the reagent box 20. A reagent pump 18 and a pickling valve 19 are provided on the pickling pipe 17. The pickling valve 19 controls the opening and closing of the pickling pipe 17 and can adjust the flow of the pickling pipe 17. A collecting pipe 21 is led out from the reagent box 20 and connected to the bottom of the air cooling tower 1. The collecting pipe 21 leads the water inside the air cooling tower 1, enters the reagent box 20, mixes with the pickling reagent inside, and is pumped to the connecting pipe 13 through the reagent pump 18 and the pickling pipe 17, and then enters the air cooling tower 1 through the chilled water pipe 10 under the pumping of the chilled water pump 15.
[0030] The following is a detailed description of the design of the above key components:
[0031] The return water pipe 4 is provided with a return water valve 5 , which controls the opening and closing of the return water pipe 4 and adjusts the flow rate of the return water pipe 4 .
[0032] The water inlet pipe 6 is provided with a water inlet valve 8 , which controls the opening and closing of the water inlet pipe 6 and adjusts the flow rate of the water inlet pipe 6 .
[0033] The chilled water pipe 10 is provided with a chilled water valve 12 , which controls the opening and closing of the chilled water pipe 10 and adjusts the flow of the chilled water pipe 10 .
[0034] The connecting pipe 13 is connected to a valve 16 , and the connecting valve 16 controls the opening and closing of the connecting pipe 13 and adjusts the flow of the connecting pipe 13 .
[0035] The collecting pipe 21 is provided with a collecting valve 22 , and the collecting valve 22 controls the opening and closing of the collecting pipe 21 and adjusts the flow rate of the collecting pipe 21 .
[0036] A water inlet pipe 23 is provided on the top of the water cooling tower 14 . The water inlet pipe 23 is used to replenish water into the water cooling tower 14 . A water inlet valve 24 is provided on the water inlet pipe 23 . The water inlet valve 24 controls the opening and closing of the water inlet pipe 23 and adjusts the flow rate of the water inlet pipe 23 .
[0037] An overflow pipe 25 is provided on one side of the water cooling tower 14, and the overflow pipe 25 is connected to the drainage ditch 26. The overflow pipe 25 prevents the water level of the water cooling tower 14 from being too high, and automatically overflows to the drainage ditch 26, avoiding losses or damages caused by overflowing water.
[0038] The overflow pipe 25 is provided with a treatment pipe 27, which is connected to a treatment agent barrel 28, and a pressure pump 29 is provided on the treatment pipe 27. The overflow pipe 25 of the water cooling tower 14 extends into the water cooling tower 14. The treatment pipe 27 recycles the overflow water, introduces the overflow water into the treatment agent barrel 28, adds a special corrosion and scale inhibitor into the treatment agent barrel 28, and the agent and the overflow water are transported back to the water cooling tower 14 from the treatment agent barrel 28 under the pressure of the pressure pump 29, and then transported to the air cooling tower 1 through the chilled water pipe 10 under the pumping of the chilled water pump 15.
[0039] Example 2, as shown in Example 1, an online cleaning pipeline of the chilled water pipeline 10 of an air separation unit, the circulating water temperature is 25-30°C, and after being pressurized (0.7-0.9MPa) by the normal temperature water pump 9, it enters the middle part of the air-cooling tower 1, and is in direct countercurrent contact with the hot and humid air (0.5MPa, 70-90°C) sent into the lower part of the air-cooling tower 1 by the air inlet pipeline 2 to exchange heat and mass, so that the air is initially cooled; the air rises to the upper section of the air-cooling tower 1, and is further exchanged with the chilled water from the bottom of the water-cooling tower 14 and further cooled by the refrigerator 11. After the air is cooled to the required temperature, it is sent out of the air-cooling tower 1 through the air outlet pipeline 3 and enters the external molecular sieve adsorption system.
[0040] The circulating water enters the upper part of the water cooling tower 14 from the water inlet pipe 23, and flows out from the lower part of the water cooling tower 14 (normal pressure, 18-20°C at this time) in the water cooling tower 14; after being pressurized by the chilled water pump 15 (0.7-0.9MPa) and cooled by the refrigerator 11 (the chilled water temperature after cooling is 8-12°C), it enters the upper part of the air cooling tower 1, and after heat and mass exchange with the air, it directly flows into the lower part of the air cooling tower 1. An overflow pipe 25 is provided at the bottom of the water cooling tower 14. When the water level at the bottom of the water cooling tower 14 exceeds the overflow port position, it flows into the ditch by gravity.
[0041] For the current situation where scaling has already occurred, a plan is implemented to manage the water quality in the pipeline while the unit is running.
[0042] (1) Pickling and descaling of the chilled water pipe 10: close the connecting valve 16 and the return valve 5, open the chilled water valve 12, start the chemical pump 18, and allow the circulating water to enter the chemical tank 20 from the collecting pipe 21. Add the acid cleaning chemical into the chemical tank 20. After the circulating water enters the chemical tank 20 and mixes with the acid cleaning chemical inside, it is pumped to the connecting pipe 13 through the chemical pump 18 and the acid cleaning pipe 17. Then, it is pumped into the air cooling tower 1 through the chilled water pipe 10 under the pumping of the chilled water pump 15;
[0043] (2) The chilled water pipeline 10 inhibits corrosion and scale, and slows down scaling: For equipment that has passed the pickling process or is operating normally, when the water quality fluctuates, the corrosion and scale inhibitor can be added online synchronously and in a targeted manner. First, the corrosion and scale inhibitor is added to the treatment agent barrel 28. The agent and overflow water are transported from the treatment agent barrel 28 back to the water cooling tower 14 under the pressure of the pressure pump 29, and then are pumped to the air cooling tower 1 through the chilled water pipeline 10 by the chilled water pump 15.
[0044] The standard parts used in the utility model can all be purchased from the market, special-shaped parts can be customized according to the description in the specification and the drawings, the specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art, the machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.
[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.
Claims
1. An online cleaning pipeline for chilled water pipeline of an air separation unit, comprising an air cooling tower, an air inlet pipeline is arranged on one side of the air cooling tower, an air outlet pipeline is arranged on the top of the air cooling tower, and a return water pipeline is arranged on one side of the bottom of the air cooling tower, characterized in that: A water inlet pipe is arranged on one side of the air-cooling tower, which is connected to a circulating water pipe, on which a normal temperature water pump is arranged, a chilled water pipe is arranged on the top of the air-cooling tower, which is connected to a freezer, a connecting pipe is led out of the freezer, which is connected to the bottom of the water-cooling tower, a chilled water pump and a connecting valve are arranged on the connecting pipe, a pickling pipe is led out of the connecting pipe and is connected to a chemical box, a chemical pump and a pickling valve are arranged on the pickling pipe, and a collecting pipe is led out of the chemical box and is connected to the bottom of the air-cooling tower.
2. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 1 is characterized in that: A return valve is arranged on the return water pipeline.
3. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 1 is characterized in that: The water inlet pipe is provided with a water inlet valve.
4. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 1 is characterized in that: The chilled water pipeline is provided with a chilled water valve.
5. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 1 is characterized in that: The connecting pipeline is connected with a valve.
6. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 1 is characterized in that: The collecting pipeline is provided with a collecting valve.
7. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 1 is characterized in that: A water inlet pipe is arranged on the top of the water cooling tower, and a water inlet valve is arranged on the water inlet pipe.
8. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 7 is characterized in that: An overflow pipe is arranged on one side of the water cooling tower, and the overflow pipe is connected to the drainage ditch.
9. The online cleaning pipeline of the chilled water pipeline of an air separation unit according to claim 8, characterized in that: A processing pipeline is led out from the overflow pipe, the processing pipeline is connected to the processing agent barrel, and a pressure pump is arranged on the processing pipeline.