A kind of air space water cooling tower cooling water system

Abstract

The utility model relates to a kind of air separation water cooling tower cooling water systems, involve air separation precooling system field, production water inlet pipeline is used to transport production water, its export is communicated with the upper portion of water cooling tower, the export of nitrogen pipeline is communicated with the lower portion of water cooling tower, the import of water cooling tower drainage pipeline is communicated with the drainage port of water cooling tower, the export of water cooling tower drainage pipeline is communicated with the import of cold water water pump pipeline.The utility model has the beneficial effect that: production water enters water cooling tower, exchanges heat with lower temperature nitrogen, uses nitrogen to cool production water, then discharges from water cooling tower drainage pipeline, pumps into subsequent pipeline after passing through cold water water pump pipeline, finally enters air cooling tower and cools air.The scheme, water cooling tower cooling water source is changed into production water, only needs to increase production water inlet pipeline on the basis of original system, improves chilled water quality, reduces water cooling tower filler scale, slows down low-temperature crystallization phenomenon, reliable operation, easy to transform.

Description

Technical Field

[0001] This utility model relates to the field of air separation precooling systems, specifically to a cooling water system for an air separation water-cooled tower. Background Technology

[0002] The precooling system in an air separation unit serves to reduce the temperature of the air entering the unit, preventing significant fluctuations in the inlet temperature. If the inlet temperature is too high during operation, the throttling cooling capacity of the compressed air will decrease, and the temperature difference and heat load at the hot end of the heat exchanger will increase, leading to increased cooling loss and energy consumption. Furthermore, reducing the inlet air temperature can also alleviate the workload of the purifier and heat exchanger.

[0003] The precooling system uses circulating water (approximately 32°C) as the cooling water source for the water-cooled tower. This circulating water is cooled via a mechanical ventilation tower and replenished to the water-cooled tower by a circulating water pump. The air separation unit's circulating water, after evaporation concentration and periodic sludge discharge, requires continuous replenishment of reservoir water (production water). Corrosion and scale inhibitors and non-oxidizing bactericides are also periodically added based on the circulating water quality. After long-term operation, scale buildup can clog the packing material inside the water-cooled tower, reducing the heat exchange area and consequently increasing the outlet water temperature. This increases the load on the chiller unit. Simultaneously, the decreased outlet water temperature of the chiller unit's evaporator can cause low-temperature crystallization on the chilled water side, further deteriorating heat exchange. This results in an increase in the outlet water temperature of the air-cooled tower, leading to a decrease in the unit's load. Utility Model Content

[0004] The technical problem to be solved by this invention is how to reduce the impact of scale on the precooling system.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A cooling water system for an air separation water-cooled tower includes a production water inlet pipeline, a water-cooled tower, a nitrogen pipeline, a water-cooled tower drain pipeline, and a cold water pump pipeline. The production water inlet pipeline is used to transport production water, and its outlet is connected to the upper part of the water-cooled tower. The outlet of the nitrogen pipeline is connected to the lower part of the water-cooled tower. The inlet of the water-cooled tower drain pipeline is connected to the drain outlet of the water-cooled tower, and the outlet of the water-cooled tower drain pipeline is connected to the inlet of the cold water pump pipeline.

[0006] The beneficial effects of this invention are as follows: Production water enters the water-cooling tower, exchanges heat with cooler nitrogen gas, and uses the nitrogen to cool the production water. It is then discharged from the water-cooling tower's drain pipe, pumped into subsequent pipes via a chilled water pump, and finally enters the air-cooling tower to cool the air. In this solution, the cooling water source for the water-cooling tower is changed to production water. Only a production water inlet pipe needs to be added to the original system, improving the chilled water quality, reducing scaling on the water-cooling tower packing, mitigating low-temperature crystallization, ensuring reliable operation, and simplifying the modification process.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the air separation water cooling tower cooling water system also includes a chiller and chilled water pipelines. The chiller has a chiller heat medium pipeline and a chiller refrigerant pipeline for mutual heat exchange. The inlet of the chiller heat medium pipeline is connected to the outlet of the chilled water pump pipeline, and the outlet of the chiller heat medium pipeline is connected to the inlet of the chilled water pipeline.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the production water, after being cooled by the water cooling tower, enters the chiller's heat medium pipeline for further cooling to meet the air cooling tower's water temperature requirements.

[0010] Furthermore, the cold water pump pipeline is provided in two sets, and the two sets of cold water pump pipelines are connected in parallel.

[0011] The advantages of adopting the above-mentioned further solution are: the two sets of chilled water pump pipelines are connected in parallel and serve as backups for each other, preventing the operation of the air separation system from being affected after a pump failure; only one set of chilled water pump pipelines is turned on at a time, so that the other set of chilled water pump pipelines can be repaired and maintained.

[0012] Furthermore, the air separation water cooling tower cooling water system also includes branch pipelines, the inlet and outlet of which are connected to the inlet and outlet of the chiller heat medium pipeline, respectively, and the branch pipelines are equipped with branch switch valves, and the chiller heat medium pipelines are equipped with heat medium switch valves.

[0013] The beneficial effects of adopting the above-mentioned further solution are: when the temperature of the production water is low, the heat transfer medium switch valve can be closed and the branch switch valve can be opened, allowing the water discharged from the water-cooled tower to directly enter the subsequent chilled water pipeline through the branch pipeline. This allows for the rational use of the chiller and reduces equipment energy consumption.

[0014] Furthermore, the cooling water system of the air separation water-cooled tower also includes a return liquid pipeline, the inlet of which is connected to the middle of the chilled water pipeline, and the outlet of which is connected to the lower part of the water-cooled tower.

[0015] The beneficial effect of adopting the above-mentioned further solution is that the return liquid pipeline can send the excess cooling capacity back to the water cooling tower to maintain the low temperature environment inside the water cooling tower.

[0016] Furthermore, a return liquid switch valve is provided on the return liquid pipeline.

[0017] The beneficial effect of adopting the above-mentioned further solution is that the return liquid switch valve is used to control the opening and closing of the return liquid pipeline.

[0018] Furthermore, the air separation water cooling tower cooling water system also includes an air cooling tower, and the outlet of the chilled water pipeline is connected to the air cooling tower.

[0019] The beneficial effect of adopting the above-mentioned further scheme is that the chilled water output from the chilled water pipeline cools the air inside the air-cooled tower, thereby reducing the air temperature entering the air separation unit.

[0020] Furthermore, a production water pump is installed on the production water inlet pipeline.

[0021] The beneficial effect of adopting the above-mentioned further solution is that the production water is pressurized and supplied to the water cooling tower through the production water pump.

[0022] Furthermore, the cooling water system of the air separation water-cooled tower also includes a circulating water inlet pipeline, the outlet of which is connected to the upper part of the water-cooled tower, and a circulating water inlet valve is provided on the circulating water inlet pipeline, and a production water inlet valve is provided on the production water inlet pipeline.

[0023] The beneficial effect of adopting the above-mentioned further solution is that the circulating water inlet pipeline can be used temporarily and for short periods of time as a backup water source.

[0024] Furthermore, the inlet of the nitrogen pipeline is connected to both the nitrogen gas delivery pipeline and the waste nitrogen delivery pipeline.

[0025] The beneficial effect of adopting the above-mentioned further scheme is that the nitrogen gas delivery pipeline and the waste nitrogen delivery pipeline are used to deliver nitrogen gas and waste nitrogen respectively for cooling. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cooling water system of the air separation water-cooled tower of this utility model.

[0027] The attached diagram lists the components represented by each number as follows: 1. Production water inlet pipeline; 2. Circulating water inlet pipeline; 3. Nitrogen pipeline; 4. Water-cooled tower drain pipeline; 5. Chilled water pump pipeline; 6. Chiller heat medium pipeline; 7. Chiller refrigerant pipeline; 8. Branch pipeline; 9. Return pipeline; 10. Chilled water pipeline; 11. Water-cooled tower. Detailed Implementation

[0028] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0029] like Figure 1As shown, this embodiment provides a cooling water system for an air separation water-cooled tower, including a production water inlet pipe 1, a water-cooled tower 11, a nitrogen pipe 3, a water-cooled tower drain pipe 4, and a chilled water pump pipe 5. The production water inlet pipe 1 is used to transport production water, and its outlet is connected to the upper part of the water-cooled tower 11. The outlet of the nitrogen pipe 3 is connected to the lower part of the water-cooled tower 11. The inlet of the water-cooled tower drain pipe 4 is connected to the drain port of the water-cooled tower 11, and the outlet of the water-cooled tower drain pipe 4 is connected to the inlet of the chilled water pump pipe 5.

[0030] The production water enters the water-cooled tower 11, where it exchanges heat with cooler nitrogen gas to cool the water. The water is then discharged from the water-cooled tower drain pipe 4, pumped into subsequent pipes via the chilled water pump pipe 5, and finally enters the air-cooled tower to cool the air. In this scheme, the cooling water source for the water-cooled tower 11 is changed to production water. Only the addition of a production water inlet pipe 1 to the original system is needed to improve the chilled water quality, reduce scaling on the water-cooled tower packing, mitigate low-temperature crystallization, ensure reliable operation, and simplify the modification process.

[0031] Specifically, such as Figure 1 As shown, the bottom of the water-cooled tower 11 is also equipped with discharge pipes for discharging excess liquid and gas respectively.

[0032] Based on the above technical solution, the air separation water cooling tower cooling water system also includes a chiller and a chilled water pipeline 10. The chiller has a chiller heat medium pipeline 6 and a chiller refrigerant pipeline 7 that exchange heat with each other. The inlet of the chiller heat medium pipeline 6 is connected to the outlet of the chilled water pump pipeline 5, and the outlet of the chiller heat medium pipeline 6 is connected to the inlet of the chilled water pipeline 10.

[0033] The production water, after being cooled by the water-cooling tower 11, enters the chiller's heat medium pipeline 6 for further cooling to meet the air-cooled tower's water temperature requirements.

[0034] Specifically, in one particular example, the production water is stored water from a reservoir, which is at a lower temperature than the circulating water, thereby reducing the load on the chiller unit.

[0035] Specifically, the refrigerant in the chiller's refrigerant line 7 is cooled circulating water.

[0036] Based on the above technical solution, the cold water pump pipeline 5 is provided in two sets, and the two sets of cold water pump pipeline 5 are connected in parallel.

[0037] Two sets of chilled water pump pipelines 5 are connected in parallel, serving as backups for each other to prevent pump failures from affecting the operation of the air separation system; only one set of chilled water pump pipelines 5 is activated at a time, allowing for maintenance and repair of the other set of chilled water pump pipelines 5.

[0038] Specifically, the cold water pump pipeline 5 is equipped with a cold water pump, a switch valve, and indicating instruments (such as pressure gauges).

[0039] Based on the above technical solution, the air separation water cooling tower cooling water system also includes a branch pipe 8, the inlet and outlet of the branch pipe 8 are respectively connected to the inlet and outlet of the chiller heat medium pipe 6, and a branch switch valve is provided on the branch pipe 8, and a heat medium switch valve is provided on the chiller heat medium pipe 6.

[0040] When the temperature of the production water is low (e.g., in winter), the heat transfer valve can be closed and the branch valve opened, allowing the water discharged from the water-cooled tower 11 to directly enter the subsequent chilled water pipeline 10 through the branch pipeline 8. This allows for the rational use of the chiller and reduces equipment energy consumption.

[0041] Based on the above technical solution, the air separation water cooling tower cooling water system also includes a return liquid pipeline 9, the inlet of which is connected to the middle of the chilled water pipeline 10, and the outlet of which is connected to the lower part of the water cooling tower 11.

[0042] The return line 9 can send excess cooling energy back to the water-cooled tower 11 to maintain the low-temperature environment inside the water-cooled tower 11. In other words, part of the chilled water in the chilled water line 10 is sent to the air-cooled tower, and the other part flows back to the water-cooled tower 11.

[0043] Based on the above technical solution, a return liquid switch valve is provided on the return liquid pipeline 9.

[0044] The return liquid switch valve is used to control the opening and closing of the return liquid line 9.

[0045] Based on the above technical solution, the air separation water cooling tower cooling water system also includes an air cooling tower, and the outlet of the chilled water pipeline 10 is connected to the air cooling tower.

[0046] The chilled water output from chilled water pipeline 10 cools the air inside the air-cooled tower, thereby reducing the temperature of the air entering the air separation unit.

[0047] Specifically, the function of the air-cooled tower is to cool the air with water, so that the air from the air compressor, which is less than 100°C, reaches below 12°C and then enters the purifier.

[0048] Based on the above technical solution, a production water pump is provided on the production water inlet pipeline 1.

[0049] The production water is pressurized by the production water pump and supplied to the water cooling tower 11.

[0050] Based on the above technical solution, the air separation water cooling tower cooling water system also includes a circulating water inlet pipe 2, the outlet of which is connected to the upper part of the water cooling tower 11, a circulating water inlet valve on the circulating water inlet pipe 2, and a production water inlet valve on the production water inlet pipe 1.

[0051] The circulating water inlet pipe 2 serves as a backup water source and can be used temporarily or for short periods.

[0052] Based on the above technical solution, the inlet of the nitrogen pipeline 3 is connected to the nitrogen gas transmission pipeline and the waste nitrogen transmission pipeline respectively.

[0053] Nitrogen gas delivery pipeline and waste nitrogen delivery pipeline are used to deliver nitrogen gas and waste nitrogen respectively for cooling purposes.

[0054] Furthermore, in this embodiment, both the air-cooled tower and the water-cooled tower are filled with randomly packed plastic Pall rings to increase the contact area between air and water. A layer of stainless steel packing is also arranged at the bottom of the air-cooled tower to prevent the plastic from aging due to high temperatures at the air inlet.

[0055] Furthermore, in this embodiment, as Figure 1 As shown, PG is a local pressure gauge, TE is a remote temperature gauge, LG is a local liquid level gauge, and LT is a remote liquid level gauge. Local pressure gauges are installed at the inlet sections of the production water inlet line 1, the two chilled water pump lines 5, and the chiller refrigerant line 7. Remote temperature gauges are installed at the inlet and outlet sections of the water-cooled tower drain line 4 and the chiller refrigerant line 7. Local and remote liquid level gauges are installed at the bottom of the water-cooled tower 11.

[0056] For precooling systems, the evaporator side of the chiller is generally designed to produce 7°C water, and the chilled water quality requirements are relatively high. For systems that use open-loop circulating chilled water, if demineralized water is used, the operating cost will increase significantly. Therefore, it is particularly important to reasonably improve the chilled water quality, reduce low-temperature crystallization, and ensure the efficient operation of the unit.

[0057] This embodiment replaces the evaporation-concentrated circulating water with raw reservoir water for chilled water, which not only improves water quality but also lowers water temperature. Furthermore, the modification is simple and the operation is reliable, making it suitable for widespread application. Simultaneously, the production water temperature is only 5-10℃ in winter, fully utilizing the production water temperature, allowing the chiller to be shut down and saving energy.

[0058] This invention relates to a cooling water system for an air separation water-cooled tower, which is reliable and easy to operate. When the production water pump stops, the original water-cooled tower makeup water regulating valve (circulating water inlet valve) can automatically track the water level in the water-cooled tower and start the chiller unit without affecting the precooling system. Simultaneously, the production water pump incorporates start-up permission and interlocking shutdown logic to ensure reliable operation of the unit. This invention effectively reduces operating power consumption, improves unit reliability, avoids load limitations caused by the chiller's chemical cleaning system, effectively extends the service life of the chiller unit, and reduces the risk of water-cooled tower packing blockage.

[0059] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An air cooled tower cooling water system characterized by, It includes a production water inlet pipeline (1), a water cooling tower (11), a nitrogen pipeline (3), a water cooling tower drain pipeline (4), and a cold water pump pipeline (5). The production water inlet pipeline (1) is used to transport production water, and its outlet is connected to the upper part of the water cooling tower (11). The outlet of the nitrogen pipeline (3) is connected to the lower part of the water cooling tower (11). The inlet of the water cooling tower drain pipeline (4) is connected to the drain port of the water cooling tower (11), and the outlet of the water cooling tower drain pipeline (4) is connected to the inlet of the cold water pump pipeline (5).

2. The air cooled tower water cooling system of claim 1, wherein, It also includes a chiller and a chilled water pipeline (10). The chiller has a chiller heat medium pipeline (6) and a chiller cold medium pipeline (7) for mutual heat exchange. The inlet of the chiller heat medium pipeline (6) is connected to the outlet of the chilled water pump pipeline (5), and the outlet of the chiller heat medium pipeline (6) is connected to the inlet of the chilled water pipeline (10).

3. The system of claim 2, wherein, The cold water pump pipeline (5) is provided in two sets, and the two sets of cold water pump pipeline (5) are connected in parallel.

4. The air cooled tower water cooling system of claim 2, wherein, It also includes a branch pipeline (8), the inlet and outlet of which are connected to the inlet and outlet of the chiller heat medium pipeline (6) respectively, and a branch switch valve is provided on the branch pipeline (8), and a heat medium switch valve is provided on the chiller heat medium pipeline (6).

5. The air cooled tower water cooling system of claim 2, wherein, It also includes a return liquid pipeline (9), the inlet of which is connected to the middle of the chilled water pipeline (10), and the outlet of which is connected to the lower part of the water cooling tower (11).

6. The air cooled tower water cooling system of claim 5, wherein, The return pipeline (9) is equipped with a return switch valve.

7. The air cooled tower water cooling system of claim 2, wherein, It also includes an air-cooled tower, the outlet of which is connected to the air-cooled tower.

8. The air cooled tower water cooling system of claim 1, wherein, A production water pump is installed on the production water inlet pipeline (1).

9. The air cooled tower water cooling system of claim 1, wherein, It also includes a circulating water inlet pipe (2), the outlet of which is connected to the upper part of the water cooling tower (11), a circulating water inlet valve is provided on the circulating water inlet pipe (2), and a production water inlet valve is provided on the production water inlet pipe (1).

10. A cooling water system for an air cooled tower according to any one of claims 1 to 9, wherein The inlet of the nitrogen pipeline (3) is connected to the nitrogen gas delivery pipeline and the waste nitrogen delivery pipeline, respectively.

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