Circulating cooling equipment and air separation device

Abstract

The utility model provides a circulating cooling device and an air separation plant, the circulating cooling device is used for cooling circulating water in the air separation plant, and the circulating cooling device comprises a filtering mechanism connected with a nitrogen water tower of the air separation plant; the filtering mechanism is connected with the enriching mechanism, and the filtering mechanism is located at the upstream of the enriching mechanism; the enrichment mechanism is connected with the freezing mechanism, and the enrichment mechanism is located on the upstream of the freezing mechanism. The problem that in the prior art, a hollow separation device is prone to generating scale is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of descaling of air separation devices, in particular to a circulating cooling device and an air separation device. Background Art

[0002] An air separation unit (ASU), also known as an air separation unit (ASU), is an industrial device used to separate oxygen, nitrogen, and other rare gases from air. Its operating principle is based on the different boiling points of different gases at low temperatures, achieved through cryogenic separation technology. In an ASU, air is first compressed and then cooled and initially purified by contact with circulating water in a pre-cooling system. The circulating water plays a crucial role in this process, providing both cooling and scrubbing.

[0003] As circulating water continues to evaporate and concentrate, the concentration of impurities such as minerals (such as calcium and magnesium ions) and silicates in the water gradually increases. Once these impurities reach a certain concentration, they crystallize and form scale. The adhesion of scale not only clogs pipes and distributors, reducing heat transfer efficiency, but also reduces the efficiency of air-cooling towers and nitrogen-water towers, thereby affecting the cooling effect of the compressed air.

[0004] That is to say, the air separation device in the prior art has the problem of easily generating scale. Utility Model Content

[0005] The main purpose of the utility model is to provide a circulating cooling device and an air separation device to solve the problem that scale is easily generated in the air separation device in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a circulating cooling device is provided, which is used to cool the circulating water in the air separation unit. The circulating cooling device includes: a filtering mechanism, which is connected to the nitrogen water tower of the air separation unit; an enrichment mechanism, which is connected to the enrichment mechanism and is located upstream of the enrichment mechanism; and a freezing mechanism, which is connected to the freezing mechanism and is located upstream of the freezing mechanism.

[0007] Furthermore, the enrichment mechanism includes: an enrichment tank, the enrichment tank has an enrichment inlet and an enrichment outlet, the filtering mechanism is connected to the enrichment inlet; enrichment, the enrichment is filled in the enrichment tank, and a first pipeline, one end of the first pipeline is connected to the enrichment outlet, and the other end of the first pipeline is connected to the freezing mechanism.

[0008] Furthermore, the enriched material includes one of a macroporous resin and an ion exchange resin.

[0009] Furthermore, the enrichment outlet is located above the enrichment inlet.

[0010] Furthermore, the enrichment mechanism further includes a first control valve, which is arranged on the first pipeline.

[0011] Furthermore, the enrichment tank also has a cleaning port, which is located at the bottom of the enrichment tank, and the enrichment inlet and enrichment outlet are both located above the cleaning port. The enrichment mechanism also includes: a cleaning pipeline, one end of which is connected to the cleaning port; and a cleaning valve, which is arranged on the cleaning pipeline.

[0012] Furthermore, the filtering mechanism includes: a second pipeline, one end of which is connected to the nitrogen water tower; a filter, the other end of the second pipeline is connected to the filter, and the filter is connected to the enrichment inlet; and a second control valve, which is arranged on the second pipeline.

[0013] Furthermore, the circulating cooling equipment also includes: an auxiliary pipeline, both ends of the auxiliary pipeline are connected to the nitrogen water tower and the refrigeration mechanism respectively, and the first pipeline and the auxiliary pipeline are both connected to the auxiliary pipeline; a third control valve, which is arranged on the auxiliary pipeline.

[0014] According to another aspect of the present invention, an air separation unit is provided, comprising a nitrogen-water tower and the circulating cooling device according to any one of claims 1 to 8.

[0015] Furthermore, the air separation device also includes an air cooling tower, and a part of the circulating cooling equipment is connected to the air cooling tower.

[0016] By applying the technical solution of the present utility model, the circulating cooling equipment is used to cool the circulating water in the air separation unit. The circulating cooling equipment includes a filtering mechanism, an enrichment mechanism and a refrigeration mechanism. The filtering mechanism is connected to the nitrogen water tower of the air separation unit; the filtering mechanism is connected to the enrichment mechanism, and the filtering mechanism is located upstream of the enrichment mechanism; the enrichment mechanism is connected to the refrigeration mechanism, and the enrichment mechanism is located upstream of the refrigeration mechanism.

[0017] Because the temperature of the nitrogen water tower is relatively low, solid impurities are easily precipitated when the circulating water exits the tower. Therefore, a filtration mechanism is installed downstream of the nitrogen water tower. The filtration mechanism can perform preliminary filtration on the circulating water entering the enrichment mechanism to remove the precipitated solid impurities, thereby reducing the amount of solid impurities entering the enrichment mechanism. The enrichment mechanism has a high adsorption capacity, which can absorb calcium, magnesium ions, silicates and other ions in the circulating water that are prone to causing scaling, thereby delaying the scaling process of the air separation unit.

[0018] By setting up a filtering mechanism and an enrichment mechanism, it is possible to effectively intercept and treat suspended matter and soluble impurities in the circulating water, and prevent these impurities from accumulating to form scale in the nitrogen water tower and the refrigeration mechanism, thereby ensuring the normal operation of the air separation unit and extending the maintenance cycle of the equipment. This design not only improves the operating efficiency of the air separation unit, but also reduces the increased energy consumption and equipment damage risk caused by scale. It is suitable for air separation units of various sizes, especially in areas with high hardness water, where the effect is more significant. The circulating cooling equipment of the present application can maintain the efficient heat transfer capacity of the cooling equipment by reducing scaling, thereby improving the cooling efficiency of the circulating water, reducing the regeneration frequency of the molecular sieve, reducing energy consumption, and extending the service life of the molecular sieve. The circulating cooling equipment of the present application can continuously remove scaling materials in the circulating water without stopping the unit, significantly extending the operating cycle of the air separation unit, reducing unplanned shutdowns, and improving the overall operating efficiency and economy of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A partial schematic diagram showing an air separation unit according to an optional embodiment of the present invention; and

[0021] Figure 2 Shown Figure 1 Schematic diagram of the positional relationship among the filtering mechanism, enrichment mechanism, auxiliary pipeline and the third control valve.

[0022] The above drawings include the following reference numerals:

[0023] 10. Filtering mechanism; 11. Second pipeline; 12. Filter; 13. Second control valve; 20. Enrichment mechanism; 21. Enrichment tank; 211. Enrichment inlet; 212. Enrichment outlet; 213. Cleaning port; 22. First pipeline; 23. First control valve; 24. Cleaning pipeline; 25. Cleaning valve; 30. Nitrogen water tower; 40. Refrigeration mechanism; 50. Auxiliary pipeline; 60. Third control valve; 70. Air cooling tower. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0026] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0027] In order to solve the problem of scale generation in the air separation device in the prior art, the main purpose of the utility model is to provide a circulating cooling device and an air separation device.

[0028] like Figure 1 and Figure 2 As shown, the circulating cooling equipment is used to cool the circulating water in the air separation unit. The circulating cooling equipment includes a filtering mechanism 10, an enrichment mechanism 20 and a refrigeration mechanism 40. The filtering mechanism 10 is connected to the nitrogen-water tower 30 of the air separation unit; the filtering mechanism 10 is connected to the enrichment mechanism 20, and the filtering mechanism 10 is located upstream of the enrichment mechanism 20; the enrichment mechanism 20 is connected to the refrigeration mechanism 40, and the enrichment mechanism 20 is located upstream of the refrigeration mechanism 40.

[0029] Because the temperature of the nitrogen-water tower 30 is relatively low, solid impurities are easily precipitated when the circulating water exits the tower. Therefore, the filtration mechanism 10 is positioned downstream of the nitrogen-water tower 30. The filtration mechanism 10 performs preliminary filtration on the circulating water entering the enrichment mechanism 20 to remove precipitated solid impurities and reduce the amount of solid impurities entering the enrichment mechanism 20. The enrichment mechanism 20 has a high adsorption capacity, adsorbing scale-prone ions such as calcium and magnesium ions and silicates in the circulating water, thereby slowing scaling in the air separation unit.

[0030] By setting up the filtering mechanism 10 and the enrichment mechanism 20, the suspended matter and soluble impurities in the circulating water can be effectively intercepted and processed to prevent these impurities from accumulating and forming scale in the nitrogen water tower 30 and the freezing mechanism 40, thereby ensuring the normal operation of the air separation unit and extending the maintenance cycle of the equipment. This design not only improves the operating efficiency of the air separation unit, but also reduces the increased energy consumption and equipment damage risk caused by scale. It is suitable for air separation units of various sizes, especially in areas with high hardness water, where the effect is more significant. The circulating cooling equipment of the present application can maintain the efficient heat transfer capacity of the cooling equipment by reducing scaling, thereby improving the cooling efficiency of the circulating water, reducing the regeneration frequency of the molecular sieve, reducing energy consumption, and extending the service life of the molecular sieve. The circulating cooling equipment of the present application can continuously remove scaling substances in the circulating water without stopping the unit, significantly extending the operating cycle of the air separation unit, reducing unplanned shutdowns, and improving the overall operating efficiency and economy of the unit.

[0031] like Figure 2As shown, the enrichment mechanism 20 includes an enrichment tank 21, enriched material and a first pipeline 22. The enrichment tank 21 has an enrichment inlet 211 and an enrichment outlet 212. The filtering mechanism 10 is connected to the enrichment inlet 211. The enriched material is filled in the enrichment tank 21. One end of the first pipeline 22 is connected to the enrichment outlet 212, and the other end of the first pipeline 22 is connected to the freezing mechanism 40. By filling the enriched material in the enrichment tank 21, the impurities remaining in the filtered water can be further adsorbed and treated to ensure that the water quality entering the freezing mechanism 40 meets the requirements. It is used in air separation units in the chemical, metallurgical, electric power and other industries, effectively avoiding equipment efficiency reduction and failures caused by water quality problems. In actual applications, the efficient processing capacity of the enrichment tank 21 can significantly improve the purity of cooling water, reduce the maintenance frequency of the freezing mechanism 40, reduce downtime, and provide stable and reliable cooling water support for industrial production.

[0032] By adding an enrichment tank 21, a filtering mechanism 10 and a first pipe 22 connected to the refrigeration mechanism 40, the present application can filter and adsorb the circulating water once in the process of the circulating water returning to the refrigeration mechanism 40, filter the precipitated scale by physical and chemical means, and reduce the concentration of ions that easily cause scaling, thereby effectively controlling the scaling cycle, thereby achieving multiple effects of improving equipment efficiency, extending maintenance cycle, reducing energy consumption and cost, and enhancing safety and reliability.

[0033] Optionally, the enrichment material comprises a macroporous resin or an ion exchange resin. Macroporous resins have larger pore sizes, effectively adsorbing macromolecular organic matter and colloids in the water, not just ions. Ion exchange resins, on the other hand, more effectively adsorb and remove ions from water through charge exchange. These properties enable the enrichment material to more comprehensively remove scaling substances from the circulating water, improving descaling efficiency.

[0034] Macroporous resins and ion exchange resins have highly selective adsorption properties, particularly strong adsorption capacity for divalent cations such as calcium and magnesium. In circulating water systems, these ions are the primary cause of scale formation. By using enriched materials, the concentration of calcium and magnesium ions in the circulating water can be significantly reduced, thereby delaying or preventing scale formation and maintaining efficient operation of the precooling system. By reducing scaling substances in the circulating water, the maintenance frequency of precooling equipment such as the air cooling tower 70 and nitrogen water tower 30 can be significantly reduced, reducing equipment damage caused by scaling. This not only extends the service life of the equipment and reduces the cost of equipment replacement and maintenance, but also improves the stability and reliability of the entire air separation unit.

[0035] Compared to traditional chemical water treatment methods, using macroporous resins or ion exchange resins as enrichment agents reduces the use of chemical agents and potential environmental pollution. Furthermore, their regeneration process produces relatively small amounts of wastewater, which is easier to handle, making it a more environmentally friendly water treatment technology.

[0036] like Figure 2 As shown, the enrichment outlet 212 is located above the enrichment inlet 211. Inside the enrichment tank, water flows in from the enrichment inlet 211 and passes through the filled enrichment. The calcium ions (Ca 2 +), magnesium ions (Mg 2 +) and other impurities are adsorbed and enriched. Designing the enrichment outlet 212 above the enrichment inlet 211 allows the water to flow from bottom to top in the tank, which can increase the contact time and area between the water and the enriched material, thereby improving the adsorption efficiency and more thoroughly removing scaling substances in the water.

[0037] Since the enriched material is usually located at the bottom of the enrichment tank 21, designing the enrichment outlet 212 at the top can prevent the enriched material from being carried out of the enrichment tank 21 with the water flow during normal operation, ensuring the stability and long-term use of the enriched material. At the same time, this also reduces the complexity and cost of system maintenance because the enriched material does not need to be frequently replenished or replaced.

[0038] like Figure 2 As shown, the enrichment mechanism 20 also includes a first control valve 23, which is disposed on the first pipeline 22. First control valve 23 acts as an isolation device in the pipeline. When maintenance is required on the enrichment tank 21 (e.g., replacing adsorbent material or cleaning impurities), first control valve 23 can be closed to isolate the enrichment mechanism 20 from the main circulating water flow. Maintenance can then be performed without affecting the normal operation of other components. This not only reduces maintenance time but also avoids shutdown of the entire air separation unit due to maintenance, reducing maintenance costs and improving unit availability.

[0039] Furthermore, the first control valve 23 precisely controls the opening and closing of the first pipeline 22 and the flow rate within the first pipeline 22, allowing the operator to precisely regulate the flow of circulating water from the enrichment tank 21 to the refrigeration mechanism 40. Within the enrichment tank 21, the circulating water is in full contact with the enrichment material (macroporous resin or ion exchange resin) to remove impurities such as calcium and magnesium ions and silicates. Adjustment of the first control valve 23 ensures that the water flow rate is maintained within an optimal range, neither too fast to affect the adsorption effect nor too slow to waste energy, thereby improving descaling efficiency.

[0040] The presence of first control valve 23 prevents equipment damage during system operation due to abnormal flow or pressure changes within enrichment tank 21. For example, if the adsorbent material within enrichment tank 21 becomes saturated or clogged, the flow rate can be controlled by adjusting the opening of first control valve 23, preventing excessive pressure from affecting downstream equipment (such as refrigeration mechanism 40) and ensuring safe and stable system operation.

[0041] like Figure 2 As shown, the enrichment tank 21 also has a cleaning port 213, which is located at the bottom of the enrichment tank 21, and the enrichment inlet 211 and the enrichment outlet 212 are both located above the cleaning port 213. The enrichment mechanism 20 also includes a cleaning pipeline 24 and a cleaning valve 25, one end of the cleaning pipeline 24 is connected to the cleaning port 213; the cleaning valve 25 is arranged on the cleaning pipeline 24. The cleaning port 213 is arranged at the bottom of the enrichment tank 21, so that in the process of maintaining the enrichment tank 21, the accumulated substances in the enrichment tank 21 (such as macroporous resin or ion exchange resin after adsorption saturation, and filtered impurities) can be quickly and thoroughly discharged by opening the cleaning valve 25 and using the cleaning pipeline 24. This design avoids the complexity and time-consuming and labor-intensive nature of traditional cleaning methods, and improves the convenience and efficiency of maintenance. Regular cleaning through the cleaning port 213 can ensure that the adsorption material (such as macroporous resin or ion exchange resin) in the enrichment tank 21 is in the best condition, avoid the adsorption efficiency of the adsorption material being reduced due to the accumulation of impurities, ensure that the device continuously and efficiently removes scaling substances in the circulating water, delay the scaling process of the air cooling tower 70 and the nitrogen water tower 30, and improve the overall performance of the circulating cooling equipment.

[0042] The provision of cleaning port 213, along with its associated cleaning line 24 and cleaning valve 25, enables regular, automatic cleaning, reducing the need for manual cleaning. Maintenance can be performed without shutting down the unit; cleaning can be completed by simply isolating the enrichment tank 21 briefly. This not only reduces downtime due to maintenance but also avoids the significant costs and production interruptions associated with shutting down the air separation unit, significantly contributing to maintaining continuous production. Furthermore, the design of cleaning port 213 facilitates the replacement or regeneration of the adsorbent material, avoiding unnecessary material waste and further reducing operating costs.

[0043] like Figure 2As shown, the filtration mechanism 10 includes a second pipeline 11 and a filter 12. One end of the second pipeline 11 is connected to the nitrogen water tower 30; the other end of the second pipeline 11 is connected to the filter 12, which is connected to the enrichment inlet 211; and a second control valve 13 is disposed on the second pipeline 11. The second pipeline 11 directly directs the circulating water from the nitrogen water tower 30 into the filter 12. The filter 12 pre-filters the water to remove large impurities, such as suspended matter, partially crystallized calcium and magnesium salts, and silicates. If not removed promptly, these substances may accumulate in the enrichment tank 21, affecting the adsorption efficiency of the macroporous resin or ion exchange resin. The pre-filtration ensures that the circulating water entering the enrichment tank 21 is relatively pure, extending the service life and descaling effect of the adsorption material. The pre-removal of large impurities by the filter 12 on the second pipeline 11 reduces the burden on the enrichment tank 21 and subsequent processing equipment. This not only improves the overall system's operating efficiency but also reduces maintenance costs and the risk of downtime due to equipment blockage or wear. In practical applications, the efficient interception effect of the filter 12 greatly reduces the burden on the enrichment tank 21, prolongs the replacement cycle of the enriched material, and reduces the operating cost.

[0044] In addition, the second control valve 13 is arranged on the second pipeline 11, which can accurately control the amount of circulating water entering the filter 12 and the enrichment tank 21. Flow control is crucial to the performance of the adsorption material in the enrichment tank 21. Too fast a flow rate may lead to insufficient adsorption, while too slow may result in energy waste and low processing efficiency. Through the second control valve 13, the operator can adjust the flow rate of the circulating water according to actual needs to ensure the best adsorption effect while avoiding unnecessary energy consumption. When the filter 12 needs to be cleaned or replaced, or when the resin in the enrichment tank 21 needs to be regenerated, the second control valve 13 can be used as an isolation means to cut off the connection between the second pipeline 11 and the nitrogen water tower 30, avoiding system shutdown and reducing the impact of maintenance on production. At the same time, this setting simplifies the maintenance process and improves the safety and efficiency of operation.

[0045] like Figure 1 and Figure 2As shown, the circulating cooling equipment also includes an auxiliary pipeline 50 and a third control valve 60. The two ends of the auxiliary pipeline 50 are respectively connected to the nitrogen water tower 30 and the refrigeration mechanism 40. The first pipeline 22 and the auxiliary pipeline 50 are both connected to the auxiliary pipeline 50; the third control valve 60 is arranged on the auxiliary pipeline 50. The setting of the auxiliary pipeline 50 allows the circulating water to form an additional flow path between the nitrogen water tower 30 and the refrigeration mechanism 40, which provides greater flexibility for the system. Under normal operating conditions, the circulating water is mainly descaled by the filtering mechanism 10 and the enrichment mechanism 20. However, in certain circumstances, such as when the enrichment tank 21 is maintained, fails or the efficiency decreases, the third control valve 60 can be opened to allow the circulating water to enter the refrigeration mechanism 40 directly through the auxiliary pipeline 50, avoiding system shutdown and ensuring the continuous operation of the air separation unit. When the circulating water temperature or flow demand changes, the amount of circulating water passing through the auxiliary pipeline 50 can be controlled by adjusting the opening of the third control valve 60 to supplement the insufficient processing capacity of the second pipeline 11 or adjust the cooling effect of the circulating water according to actual needs to ensure that the process requirements are always met.

[0046] In addition, when the enrichment tank 21 or the second pipeline 11 requires maintenance, the operator can close the first control valve 23 and the second control valve 13, open the third control valve 60, and send the circulating water directly into the refrigeration mechanism 40 by bypassing the filter 12 and the enrichment tank 21. This not only reduces the impact on production, but also facilitates the replacement, cleaning or other maintenance work of the macroporous resin inside the enrichment tank 21. The setting of the auxiliary pipeline 50 and the third control valve 60 provides a backup path for the system. When the filtering mechanism 10 and the enrichment mechanism 20 require maintenance, water can be directly supplied through the auxiliary pipeline 50. It is suitable for industrial cooling systems that require continuous operation and ensures uninterrupted operation of the equipment. This backup path design can ensure a continuous supply of cooling water during equipment maintenance, avoiding production interruptions caused by equipment maintenance, which is especially important for production lines that require 24-hour continuous operation.

[0047] In other optional embodiments, the air separation unit includes a nitrogen water tower 30 and the above-mentioned circulating cooling equipment. The air separation unit in this embodiment adopts a circulating cooling equipment integrated with a filtering mechanism 10 and an enrichment mechanism 20, which not only improves the efficiency and stability of the air separation process, but also reduces the maintenance cost and energy consumption of the equipment. It is suitable for large-scale industrial gas production and supply scenarios, and has a significant effect on improving production efficiency and reducing operating costs. In large-scale industrial gas production, high efficiency and low energy consumption are the key to corporate competitiveness. The design of this air separation unit meets this demand, which can not only improve the purity and output of the gas, but also reduce production costs, bringing greater economic benefits to the enterprise. At the same time, it reduces the impact on the environment, which is in line with the concept of green production.

[0048] The use of this circulating cooling equipment more effectively removes scaling substances, such as calcium and magnesium ions, and silicates, from the circulating water, reducing scale buildup in the system. Since scale impedes heat exchange and reduces cooling efficiency, the reduction in scale means the air separation unit's pre-cooling system can more consistently maintain excellent cooling performance, ensuring lower air temperatures and reduced moisture content before entering the distillation tower. This not only improves the purity of products like oxygen and nitrogen, but also increases the unit's output, as drier air allows for more efficient separation of the desired gases during the distillation process.

[0049] In air separation units, molecular sieve regeneration requires heating. High moisture content in the air leads to frequent molecular sieve regeneration, which reduces the service life of the molecular sieve. The circulating cooling equipment of the present application reduces the number of molecular sieve regenerations required by maintaining the cleanliness of the circulating water, thereby extending the service life of the molecular sieve. It also extends the operating cycle of the air separation unit, reduces unplanned downtime, and improves production efficiency.

[0050] The enrichment mechanism 20 in the circulating cooling apparatus of the present application is provided with a cleaning port 213, a cleaning line 24, and a cleaning valve 25, making maintenance and cleaning processes simpler and faster. This means that maintenance costs and downtime of the air separation unit are reduced, maintenance work is more efficient, and the impact on production is minimized.

[0051] exist Figure 1 In the illustrated embodiment, the air separation unit further includes an air cooling tower 70, with a portion of the circulating cooling equipment communicating with the air cooling tower 70. Compressed air, typically at a relatively high temperature, exits the compressor unit of the air separation unit. Upon entering the air cooling tower 70, the compressed air comes into contact with the circulating cooling water sprayed therein. Due to the relatively low temperature of the circulating cooling water, the water absorbs the heat from the compressed air, thereby cooling the compressed air.

[0052] like Figure 1 As shown, compressed air enters the circulating water from the bottom of the air-cooling tower 70 and is divided into two streams: one stream enters the spray from the middle of the air-cooling tower 70 and comes into direct contact with the compressed air, performing a primary scrubbing and cooling of the compressed air; the other stream is sent to the top of the nitrogen-water tower 30 and flows down from the top. Contaminated nitrogen (nitrogen of lower purity, which cannot be used as a product) enters from the bottom of the nitrogen-water tower 30 and comes into direct contact with the circulating water. Part of the circulating water vaporizes and becomes gas, which is carried by the contaminated nitrogen and leaves from the top of the nitrogen-water tower 30. Due to the heat absorbed by vaporization, the original circulating water is cooled (and calcium, magnesium ions, and silicates are concentrated). The circulating water then flows out from the bottom of the nitrogen-water tower 30, is pressurized by a pump, and enters the air-cooling tower 70 from the top of the air-cooling tower 70, where it comes into direct contact with the compressed air for a secondary cooling and scrubbing.

[0053] It should be noted that in this application, a circulation pump can be provided according to actual needs, and no specific limitation is made here.

[0054] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0056] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A circulating cooling device, characterized in that: The circulating cooling device is used to cool the circulating water in the air separation unit, and the circulating cooling device includes: A filtering mechanism (10), wherein the filtering mechanism (10) is connected to a nitrogen-water tower (30) of the air separation unit; an enrichment mechanism (20), the filtering mechanism (10) being connected to the enrichment mechanism (20), and the filtering mechanism (10) being located upstream of the enrichment mechanism (20); A freezing mechanism (40), the enrichment mechanism (20) is connected to the freezing mechanism (40), and the enrichment mechanism (20) is located upstream of the freezing mechanism (40).

2. The circulating cooling device according to claim 1, characterized in that: The enrichment mechanism (20) comprises: An enrichment tank (21), the enrichment tank (21) having an enrichment inlet (211) and an enrichment outlet (212), the filtering mechanism (10) being connected to the enrichment inlet (211); enriched material, the enriched material is filled in the enrichment tank (21), A first pipeline (22), one end of the first pipeline (22) is connected to the enrichment outlet (212), and the other end of the first pipeline (22) is communicated with the freezing mechanism (40).

3. The circulating cooling device according to claim 2, characterized in that: The enriched material comprises one of a macroporous resin and an ion exchange resin.

4. The circulating cooling device according to claim 2, characterized in that: The enrichment outlet (212) is located above the enrichment inlet (211).

5. The circulating cooling equipment according to claim 2, characterized in that: The enrichment mechanism (20) further comprises a first control valve (23), and the first control valve (23) is arranged on the first pipeline (22).

6. The circulating cooling device according to claim 2, characterized in that: The enrichment tank (21) further comprises a cleaning port (213), the cleaning port (213) being located at the bottom of the enrichment tank (21), the enrichment inlet (211) and the enrichment outlet (212) being both located above the cleaning port (213), and the enrichment mechanism (20) further comprising: a cleaning pipeline (24), one end of the cleaning pipeline (24) being connected to the cleaning port (213); A cleaning valve (25) is provided on the cleaning pipeline (24).

7. The circulating cooling device according to claim 2, characterized in that: The filtering mechanism (10) comprises: a second pipeline (11), one end of the second pipeline (11) being in communication with the nitrogen-water tower (30); a filter (12), the other end of the second pipeline (11) being connected to the filter (12), and the filter (12) being connected to the enrichment inlet (211); A second control valve (13), wherein the second control valve (13) is arranged on the second pipeline (11).

8. The circulating cooling device according to claim 7, characterized in that: The circulating cooling device also includes: An auxiliary pipeline (50), the two ends of the auxiliary pipeline (50) being connected to the nitrogen water tower (30) and the refrigeration mechanism (40) respectively, and the first pipeline (22) and the auxiliary pipeline (50) being both connected to the auxiliary pipeline (50); A third control valve (60) is provided on the auxiliary pipeline (50).

9. An air separation unit, characterized in that: It comprises a nitrogen-water tower (30) and the circulating cooling equipment according to any one of claims 1 to 8.

10. The air separation unit according to claim 9, characterized in that The air separation device further comprises an air cooling tower (70), and a portion of the circulating cooling equipment is communicated with the air cooling tower (70).

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