Circulating water cooling device based on heat absorption characteristic of vaporizer

Abstract

The utility model relates to the technical field of vaporizer cooling, and particularly discloses a circulating water cooling device based on vaporizer heat absorption characteristics, which comprises a vaporizer connected with a liquid nitrogen tank, a cooling water tank is arranged outside the vaporizer, and the vaporizer is completely arranged at the bottom of the cooling water tank; a water outlet is formed in the bottom of the cooling pond, a water inlet is formed in the top of the cooling pond and connected with the water outlet end of the circulating water system, and the water outlet is connected with the water inlet end of the circulating water system; the circulating water system is connected to the cooling station. The characteristics of the vaporizer and the cooling water are combined, the input time is short, benefits are high, the cooling water absorbs heat generated after vaporization of the vaporizer in the circulation process, a refrigerant in the vaporizer is helped to be liquefied again, cyclic utilization of the refrigerant is achieved, the vaporizer freezing problem is avoided, and the energy utilization rate of the whole system is increased.

Description

Technical Field

[0001] This utility model relates to the field of vaporizer cooling technology, specifically to a circulating water cooling device based on the heat absorption characteristics of a vaporizer. Background Technology

[0002] Liquid nitrogen vaporizers, as key equipment in cryogenic systems, are widely used in industrial gas supply. Their core function is to convert cryogenic liquid nitrogen into gaseous nitrogen to meet production needs. However, existing liquid nitrogen vaporizers suffer from significant problems in actual operation, including high energy consumption, susceptibility to icing, and low efficiency. Because the vaporization process requires the absorption of a large amount of ambient heat, the surface temperature of the vaporizer drops sharply, causing water vapor in the air to condense on its outer wall and form an ice layer. As the ice layer thickens, heat exchange efficiency decreases significantly, leading to a reduction in nitrogen conversion rate and an increase in energy consumption. Furthermore, the accumulation of ice may detach due to gravity or vibration, posing a risk of injuring equipment, pipelines, or personnel. Frequent de-icing operations also increase maintenance costs and affect the continuous and stable operation of the equipment.

[0003] Currently, common solutions to the problem of vaporizer icing include initial flushing with cooling water, followed by electric heating de-icing, mechanical de-icing, or the application of antifreeze coatings. However, these methods are either energy-intensive and economical, or only provide short-term relief and cannot fundamentally inhibit ice formation. Furthermore, existing technologies struggle to balance vaporization efficiency with safety and operational stability, resulting in liquid nitrogen vaporizers operating at low efficiency for extended periods, thus hindering the overall performance of industrial gas supply systems.

[0004] To address the aforementioned issues, existing technology proposes a cooling water generating device utilizing the cooling gas from a liquid nitrogen vaporizer (patent publication number CN204594284U). This technology involves setting up a water collection tank, within which a liquid nitrogen vaporizer is placed. The vaporizer's inlet is connected to a nitrogen tank via a first nitrogen pipe, and its outlet is connected to a second nitrogen pipe. A spray head is positioned directly above the vaporizer to spray water onto it. While this spray head method effectively solves the problem of vaporizer icing, it requires additional equipment such as spray heads. Furthermore, although there is a water collection tank below, water sprayed from a height is not easily collected, necessitating a larger collection tank with a wider coverage area for effective collection and reduced waste. This results in both the spray head above and the water collection tank below requiring significantly more space, making the installation structure more complex, increasing construction difficulty and cost, and hindering implementation.

[0005] Therefore, there is an urgent need for a new technical solution to effectively solve the problem of carburetor icing without increasing additional energy consumption, and to improve its operating efficiency and safety. Utility Model Content

[0006] The present invention aims to provide a circulating water cooling device based on the heat absorption characteristics of a vaporizer, in order to solve the problems of severe icing in existing vaporizers, which affects efficiency, increases energy consumption, and easily leads to safety risks.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This invention provides a circulating water cooling device based on the heat absorption characteristics of a vaporizer. A small cooling water tank is constructed, with the vaporizer fixed at the bottom. Water from the circulating water system is introduced into the cooling water tank, flowing in from the top and out from the bottom. This allows the refrigerant in the vaporizer to fully absorb heat energy from the circulating water through evaporation, achieving primary cooling. The circulating water then achieves secondary cooling through its flow, solving the problem of vaporizer icing while improving the cooling effect of the circulating water, realizing the recycling of the refrigerant, and improving the energy efficiency of the entire system. Specifically, the circulating water cooling device based on the heat absorption characteristics of a vaporizer includes a vaporizer connected to a liquid nitrogen tank. A cooling water tank is located outside the vaporizer, with the entire vaporizer placed at the bottom of the cooling water tank. The bottom of the cooling water tank has an outlet, and the top has an inlet. The inlet is connected to the outlet of the circulating water system, and the outlet is connected to the inlet of the circulating water system. The circulating water system is connected to a cooling station.

[0009] The principle and advantages of this scheme are:

[0010] In the industrial sector, circulating cooling water systems are commonly used to maintain the normal operating temperature of equipment. However, in the high temperatures of summer, the temperature of the circulating water rises significantly. Traditional cooling methods mainly rely on building new cooling stations or expanding water storage tanks, but these solutions are not only costly and difficult to construct, but also limited by site conditions, making them inflexible to implement. This also leads to the difficulty in reducing the circulating water temperature to the required level.

[0011] In the industrial sector, liquid nitrogen vaporizers and circulating water systems typically operate as independent units, respectively handling gas supply and equipment cooling. Although both involve heat exchange processes, their synergistic utilization is rarely considered in traditional technological systems due to differences in their design intent and application scenarios. This is partly due to inherent limitations in their design thinking: the core task of a liquid nitrogen vaporizer is to efficiently vaporize cryogenic media, while the core objective of a circulating water system is to reduce equipment temperature. Their thermodynamic requirements seem contradictory (the vaporizer needs to absorb heat, while the circulating water needs to dissipate heat), making it difficult for engineers to consider utilizing the vaporizer's heat absorption characteristics to assist in cooling the circulating water.

[0012] On the other hand, from an engineering implementation perspective, the heat absorption rate of the liquid nitrogen vaporizer and the heat dissipation demand of the circulating water are difficult to dynamically match. Directly introducing high-temperature circulating water may cause drastic fluctuations in the vaporizer surface temperature, exacerbating icing or vaporization instability. Conversely, insufficient heat transfer results in limited cooling effect of the circulating water, failing to meet industrial requirements. Furthermore, vaporizers typically employ a closed design to ensure airtightness, while circulating water systems are mostly open or semi-open structures. Forced integration necessitates redesigning the piping layout, pressure balancing, and antifreeze measures; otherwise, it may lead to leaks, corrosion, or ice blockage, increasing the system failure rate. In addition, the flow, temperature, and pressure parameters of the two systems differ significantly, making operation and control difficult. New control strategies need to be developed to ensure stable coordinated operation. Existing technologies struggle to coordinate the operating conditions of both systems in real time, easily leading to low heat exchange efficiency or equipment overload.

[0013] Therefore, although liquid nitrogen vaporizers and circulating water systems theoretically have the potential for thermal energy complementarity, it is difficult to combine the two in actual industrial scenarios.

[0014] Even though existing technologies disclose liquid nitrogen water circulation devices, such as the one with patent number CN203687642U, they also take into account the differences between liquid nitrogen vaporizers and circulating water systems. They simply install the liquid nitrogen vaporizer in a hot water storage tank and use separate hot and cold water storage tanks for treatment. They do not directly link the liquid nitrogen vaporizer and the circulating water system. They still use a separate hot and cold treatment method, and an additional cooling tower needs to be set up on the cold water storage tank, which increases the complexity of the equipment and the overall cost.

[0015] This solution breaks with traditional design conventions by adding a small cooling water tank between the circulating water and the vaporizer as an intermediate buffer. This tank is also interconnected with the circulating water, and the vaporizer is placed directly within the tank, allowing cooling water to flow in from the top and out from the bottom. This utilizes the temperature of the circulating water to heat the vaporizer, preventing icing, while avoiding the instability caused by a direct connection between the circulating water and the vaporizer. Simultaneously, the vaporizer's temperature further cools the water in the cooling water tank, achieving a double cooling effect before returning it to the circulating water, thus lowering the circulating water temperature to the required level without wasting water resources.

[0016] Furthermore, the height of the cooling water pool is greater than the height of the vaporizer, and the height of the cooling water flowing within it is higher than the top of the vaporizer. This ensures that the circulating water inside can completely submerge the vaporizer, preventing the vaporizer from easily freezing.

[0017] Furthermore, the volume of the cooling water tank is 28-33 m³. 3By using a compact cooling water tank, the vaporizer can be placed directly inside, completely submerged in the circulating water. This not only heats the vaporizer to prevent icing but also allows the circulating water to be cooled and reused, significantly reducing the tank's footprint. Furthermore, it eliminates the need for overly complex component structures and additional cooling facilities, greatly reducing investment costs, simplifying operation, and enhancing safety.

[0018] Furthermore, the circulating water system includes a No. 1 water tank and a No. 2 water tank, which are connected by pipelines. Connecting the cooling water from multiple production plants further improves the utilization rate of the cooling water and allows it to undergo further cooling treatment, effectively reducing the water temperature to meet the required cooling temperature. This eliminates the need for additional cooling towers or expanded water tanks, significantly reducing cooling water efficiency, lowering investment costs, facilitating implementation, and ensuring uninterrupted production.

[0019] Furthermore, the water inlet is located above the vaporizer. This allows the water in the cooling water pool to fully contact the vaporizer before flowing out to form circulating cooling water.

[0020] Furthermore, the cooling water pool is connected to the second water pool.

[0021] Furthermore, the No. 1 water tank is connected to the stamping equipment, and the No. 2 water tank is connected to the thermoforming equipment.

[0022] Furthermore, a regulating pump is installed between pool one and pool two to adjust the water level. This pump allows for the adjustment of the water levels in both pools, resolving the issue of unbalanced water level control and effectively preventing overflow.

[0023] Furthermore, the cooling water pool has a height of 2-3m and a width of 2-5m. The overall pool occupies a small area, requires little space, is more feasible, and can cover the entire vaporizer, making construction easier.

[0024] Furthermore, the water flow velocity in the cooling water pool is 1.0-2.5 m / s. This ensures that the water entering the cooling water pool is sufficiently cooled and can heat up the vaporizer, preventing icing while reducing the circulating water temperature to meet the standard 10°C cooling water requirement. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the cooling water tank in this utility model.

[0027] The markings in the accompanying drawings of the instruction manual include: liquid nitrogen tank 1, vaporizer 2, heating furnace 3, cooling water pool 4, water outlet 5, water inlet 6, No. 1 water pool 7, and No. 2 water pool 8. Detailed Implementation

[0028] The following detailed description illustrates the specific implementation method:

[0029] Example 1

[0030] This embodiment is basically as shown in the appendix. Figure 1 The diagram illustrates a circulating water cooling device based on the heat absorption characteristics of a vaporizer. It requires only a suitable water tank connected to the circulating water system. The vaporizer is fixed to the bottom of the tank, allowing cooling water to flow in from the top and out from the bottom. This allows the refrigerant within the vaporizer to fully absorb heat from the circulating water through evaporation, achieving primary cooling. The circulating water then provides secondary cooling through its flow, ensuring the equipment operates safely and efficiently, preventing shutdowns due to overheating. Simultaneously, the circulating cooling water absorbs heat from the vaporization process, helping the refrigerant within the vaporizer to reliquefy, achieving refrigerant recycling and improving the overall system's energy efficiency.

[0031] This method effectively utilizes the working principle of the vaporizer, combining the characteristics of the vaporizer with those of cooling water, resulting in short deployment time and high efficiency. In this embodiment, the circulating water cooling device includes a liquid nitrogen tank 1, a vaporizer 2 connected to the liquid nitrogen tank 1, and the other end of the vaporizer 2 connected to a heating furnace 3.

[0032] As attached Figure 2 As shown, a square-shaped cooling water tank 4 is installed outside the vaporizer 2. In this embodiment, the entire vaporizer 2 is placed in the cooling water tank 4, with the vaporizer 2 completely submerged at the bottom of the cooling water tank 4. To ensure that the vaporizer 2 is completely submerged in the cooling water tank 4 without occupying too much space, the height of the cooling water tank 4 must be greater than the height of the vaporizer 2, and the height of the cooling water flowing within it must also be higher than the top of the vaporizer 2. In this embodiment, depending on the equipment structure, the height of the cooling water tank 4 can be set to 2-3m, and the width to be 2-5m, so that the volume of the cooling water tank 4 is 28-33m³. 3 Specifically, based on the size of vaporizer 2, it is set to 30m. 3 The water flow velocity in cooling water tank 4 is controlled at 1.0-2.5 m / s to ensure that the circulating water is adequately cooled and to prevent the vaporizer 2 from freezing.

[0033] In this embodiment, a water outlet 5 is located at the bottom left side of the cooling water pool 4, and a water inlet 6 is located at the top right side of the cooling water pool 4, with the water inlet 6 positioned above the vaporizer 2. The water outlet 5 is connected to the inlet of the circulating water system, and the water inlet 6 is connected to the outlet of the circulating water system. This allows circulating water to enter the cooling water pool 4 through the water inlet 6, fully allowing the vaporizer 2 to absorb the heat from the cooling water. After being cooled by the vaporizer 2, the cooling water temperature is reduced, achieving a secondary cooling effect. The water then flows out through the water outlet 5 and re-enters the circulating water system. The circulating water system is connected to the cooling station, thus requiring only one existing cooling station to achieve the cooling effect of circulating water, greatly reducing equipment consumption and improving cooling efficiency.

[0034] In this embodiment, the circulating water system includes a No. 1 water tank 7 and a No. 2 water tank 8. The No. 1 water tank 7 is connected to the stamping equipment, and the No. 2 water tank 8 is connected to the thermoforming equipment. That is, the No. 1 water tank 7 is mainly used for cooling the equipment in the welding and stamping workshops, and the No. 2 water tank 8 is mainly used for cooling the equipment in the hot pressing and patch panel production line.

[0035] In existing technologies, the standard requirement for thermoforming processes is that the cooling water temperature for mold cooling should be 8-10℃. However, in actual production, the water temperature in pool 8 (No. 2) consistently hovers around 18℃, making the cooling water temperature too high to meet the required 10℃. This results in insufficient cooling, leading to substandard product plasticity and equipment malfunctions due to high temperatures, disrupting overall production continuity. Analysis revealed that the excessively high temperature may be caused by an insufficient pool capacity leading to inadequate heat dissipation, or by elevated ambient temperatures further exacerbating the heat dissipation difficulties. Increased equipment usage could also increase the load and heat generation, while insufficient refrigerant further weakens the cooling effect. Furthermore, improper operation or overly stringent standard requirements could also contribute to the excessively high water temperature, preventing the required standard from being met.

[0036] Based on the above analysis of the contributing factors, to address the issues of excessively high water temperature and insufficient cooling effect, we analyzed several causes one by one and proposed solutions. For now, we will disregard operational and standard issues and focus on analyzing objective factors. Our observations revealed that during actual production, when some equipment is shut down, under the same weather conditions, the cooling water temperature can meet operational requirements when the number of machines is reduced. However, simply lowering the water temperature cannot directly stop equipment operation and impact production; therefore, this solution is not feasible. While weather conditions do have some influence on water temperature, this is affected by geographical location and is uncontrollable, making it difficult to regulate. Indiscriminately increasing refrigerant, while improving cooling effect, would infinitely increase production costs, making this not the optimal choice.

[0037] Therefore, we focused on the fact that the pool's capacity was too small, and based on calculations of the existing pool's capacity, we set the current pool volume at 120m³. 3 The required cooling temperature T2 is 38℃. To cool to T1 = 0℃, according to thermodynamic formulas, the required heat dissipation for the existing water tank capacity is:

[0038] Q=cm(T2-T1)=42000J / (kg\℃)×120000kg×(38℃-0℃)=19152*10^7J;

[0039] In the formula, c is the specific heat capacity of water; m is the weight of cooling water.

[0040] Therefore, the required capacity of the expanded water tank and the weight of the cooling water (at T2 = 10℃) m = Q / c(T2 - T1) = 456m 3 .

[0041] Based on the calculations, a major challenge lies in how to improve the system to ensure feasibility, reduce construction difficulty without affecting production, minimize costs, and simultaneously accommodate such a substantial weight of cooling water. Existing technologies generally address this issue in two ways: first, by adding a cooling station to directly increase refrigeration capacity and lower water temperature; however, this method requires a cost of approximately 600,000 yuan, a huge investment, and also necessitates additional space for layout, making it impractical. The second approach is to expand the water tank to 300m³. 3 While this method can meet the cooling water weight requirements, it requires significant infrastructure investment and renovation, resulting in substantial costs, high construction difficulty, limited available space, and prolonged equipment downtime, impacting overall production schedules. Therefore, although the existing solution improves the cooling water's effectiveness, it faces considerable implementation challenges and is difficult to apply in practice.

[0042] Therefore, this solution, taking full advantage of the site and without affecting production, connects the existing No. 1 water tank 7 in the stamping equipment with the No. 2 water tank 8 in the thermoforming equipment. A pipeline connects No. 1 water tank 7 and No. 2 water tank 8, effectively expanding the capacity of the original water tanks without setting up additional tanks, thereby reducing the temperature within the tanks. Water from the No. 2 water tank is pumped to the No. 1 water tank for mixing and cooling, and then the cooled water is pumped back to the No. 2 water tank for equipment use. Simultaneously, in this embodiment, cooling water tank 4 is connected to No. 2 water tank 8, allowing water from No. 2 water tank 8 to enter cooling water tank 4, where the vaporizer 2 further reduces the circulating water temperature, achieving the effect of lowering the water temperature.

[0043] However, it is generally difficult to achieve a balanced water level between two pools, causing water to overflow. In this embodiment, to solve this problem, a regulating pump for adjusting the water level is also provided between pool 7 and pool 8.

[0044] In this embodiment, by connecting the water tanks of the two plant buildings, the water tanks are effectively enlarged without additional expansion or addition of a cooling station, thereby improving the cooling effect of the cooling water. However, in practical applications, we found that simply connecting the two water tanks only lowers the water temperature to a minimum of 13°C, failing to reach the required 10°C. Therefore, this solution creatively links the formed circulating water system with the vaporizer. A small-volume cooling water tank is set up outside the vaporizer 2, and water from the circulating water system is introduced into the cooling water tank 4. The low temperature of the vaporizer 2 further cools the circulating water to below 10°C, meeting production requirements, while simultaneously preventing the vaporizer 2 from freezing. With minimal investment and production impact, and based on the existing refrigeration station, the vaporizer and cooling water are coupled, simultaneously solving the problems of vaporizer freezing and insufficient circulating cooling water temperature. This helps the refrigerant in the vaporizer to reliquefy, achieving refrigerant recycling, improving the energy utilization rate of the entire system, and increasing overall production efficiency.

[0045] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A circulating water cooling device based on the heat absorption characteristics of a vaporizer, characterized in that: The device includes a vaporizer connected to a liquid nitrogen tank, and a cooling water pool is provided outside the vaporizer. The vaporizer is entirely placed at the bottom of the cooling water pool. The bottom of the cooling water pool has an outlet, and the top of the cooling water pool has an inlet. The inlet is connected to the outlet of a circulating water system, and the outlet is connected to the inlet of the circulating water system. The circulating water system is connected to a cooling station.

2. The circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 1, characterized in that: The height of the cooling water pool is greater than the height of the vaporizer, and the height of the cooling water flowing inside it is higher than the top of the vaporizer.

3. The circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 1, characterized in that: The volume of the cooling water tank is 28-33 m³. 3 .

4. A circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 1, characterized in that: The circulating water system includes a No. 1 water tank and a No. 2 water tank, which are connected by a pipeline.

5. A circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 1, characterized in that: The water inlet is located above the vaporizer.

6. A circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 4, characterized in that: The cooling water pool is connected to the No. 2 water pool.

7. A circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 4, characterized in that: The No. 1 water tank is connected to the stamping equipment, and the No. 2 water tank is connected to the thermoforming equipment.

8. A circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 4, characterized in that: A regulating pump for adjusting the water level is also installed between the No. 1 and No. 2 water tanks.

9. A circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 1, characterized in that: The height of the cooling water pool is 2-3m and the width is 2-5m.

10. A circulating water cooling device based on the heat absorption characteristics of a vaporizer according to claim 1, characterized in that: The water flow velocity in the cooling water pool is 1.0-2.5 m / s.

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