Liquid nitrogen vaporization system

Abstract

The utility model relates to a chemical equipment field especially relates to a liquid nitrogen vaporization system. The utility model discloses a liquid nitrogen vaporization system including the liquid nitrogen tank for storing liquid nitrogen, its connection has liquid nitrogen output pipeline, and the first stage vaporizer for carrying out the first stage vaporization to liquid nitrogen and the second stage vaporizer for carrying out the second stage vaporization to liquid nitrogen are connected in proper order along liquid nitrogen output pipeline, and the second stage vaporizer is air vaporizer. Liquid nitrogen in liquid nitrogen tank flows along liquid nitrogen delivery pipeline, first flows through the first stage vaporizer and carries out the first stage vaporization, then flows through air vaporizer and carries out the second stage vaporization, and two stage vaporization improves the vaporization rate of liquid nitrogen.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, and in particular to a liquid nitrogen vaporization system. Background Technology

[0002] When liquid nitrogen is used as an important industrial raw material in the chemical industry, it usually needs to undergo a vaporization process to be converted into a gaseous state. Liquid nitrogen stored in the tank flows along the liquid nitrogen output pipeline. When it flows through an air vaporizer connected in series in the liquid nitrogen output pipeline, it absorbs heat from the surrounding air and vaporizes to form nitrogen gas. The nitrogen gas is then transported to the workshop for use along the liquid nitrogen output pipeline. If the ambient temperature is low or ice forms on the surface of the air vaporizer after prolonged use, the liquid nitrogen may not vaporize completely, resulting in the nitrogen gas delivered to the workshop containing liquid components. Utility Model Content

[0003] The technical problem to be solved by this invention is to provide a liquid nitrogen vaporization system that improves the vaporization rate of liquid nitrogen.

[0004] To solve the above problems, the liquid nitrogen vaporization system provided by this utility model includes a liquid nitrogen tank for storing liquid nitrogen, which is connected to a liquid nitrogen output pipe. A first-stage vaporizer for first-stage vaporization of liquid nitrogen and a second-stage vaporizer for second-stage vaporization of liquid nitrogen are connected in series along the liquid nitrogen output pipe. The second-stage vaporizer is an air vaporizer.

[0005] Furthermore, the first-stage vaporizer is specifically a water vaporizer, which has an inner cavity and is equipped with an inlet and an outlet that connect to the inner cavity.

[0006] Furthermore, the water vaporizer contains an air vaporizer, and the liquid nitrogen output pipe is connected in series with the water vaporizer, specifically with the air vaporizer; when the water outlet discharges all the water in the water vaporizer to the outside, the water vaporizer degenerates into an air vaporizer.

[0007] Furthermore, the air vaporizer has finned tubes, and the liquid nitrogen output pipe is connected in series with the air vaporizer, specifically the finned tubes.

[0008] Furthermore, an overflow port is provided at the top of the water vaporizer's inner cavity.

[0009] Furthermore, a water heating device is provided, which supplies high-temperature water to the water vaporizer through the water inlet of the water vaporizer.

[0010] Furthermore, including the equipment to be cooled, the outlet includes a first outlet leading to the equipment to be cooled; and / or the outlet includes a second outlet leading to the outside.

[0011] Furthermore, a water supply heating device for the equipment to be cooled.

[0012] Furthermore, a liquid nitrogen direct connection pipeline is provided in parallel with the water vaporizer, and the liquid nitrogen tank is directly connected to the air vaporizer along the liquid nitrogen direct connection pipeline.

[0013] Furthermore, including the nitrogen-using workshop, the air vaporizer outputs nitrogen to the nitrogen-using workshop.

[0014] Beneficial effects: Liquid nitrogen in the liquid nitrogen tank flows along the liquid nitrogen delivery pipeline, first flowing through the first-stage vaporizer for first-stage vaporization, and then flowing through the air vaporizer for second-stage vaporization. The two-stage vaporization improves the vaporization rate of liquid nitrogen. Attached Figure Description

[0015] Figure 1 This is a simplified structural diagram of a liquid nitrogen vaporization system.

[0016] Symbol explanation:

[0017] 1-Liquid nitrogen tank; 2-Air vaporizer; 3-Water vaporizer; 4-Liquid nitrogen output pipe; 5-Outer cylinder; 6-Liquid nitrogen direct connection pipe; 7-Water inlet pipe; 8-Water outlet pipe; 9-Water supply pipe; 10-Finned tube; 11-Water heating device; 31-Water inlet; 32-First water outlet; 33-Second water outlet; 34-Overflow port; 35-Air vaporizer; 36-Inner cavity; 41-Ball valve on liquid nitrogen output pipe; 61-Ball valve on liquid nitrogen direct connection pipe; 71-Ball valve on water inlet pipe; 81-Ball valve on water outlet pipe. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to specific embodiments.

[0019] Liquid nitrogen vaporization system such as Figure 1 As shown, a water vaporizer 3 and an air vaporizer 2 are connected in series in the liquid nitrogen output pipe 4 connecting the liquid nitrogen tank 1. The air vaporizer 2 has a finned tube 10 (not shown in the attached figure). Liquid nitrogen flows through the finned tube 10 of the air vaporizer 2 along the liquid nitrogen output channel 4, absorbing heat from the finned tube 10 to achieve vaporization. The water vaporizer 3 includes an outer cylinder 5, and an air vaporizer 35 is housed in the inner cavity 36 of the outer cylinder 5. Its structure is the same as that of the air vaporizer 2. The liquid nitrogen output channel 4 is connected in series with the water vaporizer 3, specifically with the finned tube 10 of the air vaporizer 35. The outer cylinder 5 has a water inlet 31 at the top and a first water outlet 32 ​​at the bottom. The water inlet 31 is connected to the water heating device 11 via the water inlet pipe 7. After the external water is heated by the water heating device 11, it enters the inner cavity 36 of the water vaporizer 3 through the water inlet pipe 7 and contacts the finned tube 10. It exchanges heat with the liquid nitrogen flowing through the water vaporizer 3, thus cooling down to form low-temperature water, which flows out from the first water outlet 32.

[0020] In winter, the ambient temperature is low. If liquid nitrogen only undergoes heat exchange through air vaporizer 2, the vaporization rate will be low, resulting in a large amount of liquid nitrogen remaining in the nitrogen delivered to the nitrogen-using workshop. Therefore, water vaporizer 3 is needed as the first-stage vaporizer to perform the first-stage vaporization of the liquid nitrogen, and air vaporizer 2 is needed as the second-stage vaporizer to perform the second-stage vaporization of the liquid nitrogen. See details below. Figure 1 First, open the ball valve 71 on the water inlet pipe 7. The water heated by the water heating device 11 flows into the inner cavity 36 of the water vaporizer 3 along the water inlet pipe 7. When the water flows out from the overflow port 34 at the top of the inner cavity 36 of the water vaporizer 3, it indicates that the water vaporizer 3 has contained enough high-temperature water. Then, open the ball valve 41 on the liquid nitrogen output pipe 4. The liquid nitrogen stored in the liquid nitrogen tank 1 flows along the liquid nitrogen output pipe 4 and first enters the water vaporizer 3. It exchanges heat with the high-temperature water contained in the water vaporizer 3. After absorbing heat, the liquid nitrogen partially vaporizes to form nitrogen gas, completing the first stage of vaporization. This nitrogen gas, together with the remaining unvaporized liquid nitrogen, continues to flow along the liquid nitrogen output pipe 4 into the air vaporizer 2. The remaining liquid nitrogen absorbs heat from the air in the surrounding environment of the air vaporizer 2 and undergoes a second stage of vaporization to form nitrogen gas. The nitrogen gas formed after the two stages of vaporization is transported together along the liquid nitrogen output pipe 4 to the nitrogen-using workshop. The first outlet 32 ​​of the water vaporizer 3 is connected to the workshop to be cooled via the outlet pipe 8. When the ball valve 41 is opened, the ball valve 81 on the outlet pipe 8 opens simultaneously. The high-temperature water contained in the water vaporizer 3 releases heat to the liquid nitrogen and becomes low-temperature water. It flows into the workshop to be cooled along the outlet pipe 8 to cool the equipment in the workshop. After the low-temperature water exchanges heat with the equipment to be cooled, its temperature rises to be higher than that of the outside water. It flows into the water heating device 11 along the water supply pipe 9 for heating, and then flows into the water vaporizer 3 along the inlet pipe 7 for heat exchange. This cycle continues.

[0021] See Figure 1 The bottom of the outer cylinder 5 is provided with a second water outlet 33 that connects to the outside. In summer, when the temperature is high, the second water outlet 33 is opened to discharge all the water in the water vaporizer 3 to the outside. The water vaporizer 3 then degenerates into an air vaporizer 35. The liquid nitrogen flows along the liquid nitrogen output pipe 4 and passes through the two air vaporizers 35 and 2 in sequence for two-stage vaporization. The vaporization rate is higher than that of a single air vaporizer 2.

[0022] See Figure 1 A direct liquid nitrogen pipeline 6, connected in parallel with the water vaporizer 3, connects the liquid nitrogen tank 1 and the air vaporizer 2. When the summer temperature rises to a point where liquid nitrogen can achieve a high vaporization rate by passing through only the air vaporizer 2, the ball valve 41 on the liquid nitrogen output pipeline 4, the ball valve 71 on the water inlet pipeline 7, and the ball valve 81 on the water outlet pipeline 8 are closed. The ball valve 61 on the direct liquid nitrogen pipeline 6 is then opened, allowing the liquid nitrogen stored in the liquid nitrogen tank 1 to be directly transferred to the air vaporizer 2 for vaporization via the direct liquid nitrogen pipeline 6, bypassing the water vaporizer 3. This liquid nitrogen vaporization system is equipped with a controller to manage each ball valve.

[0023] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A liquid nitrogen vaporization system, characterized by: The liquid nitrogen tank for storing liquid nitrogen is connected with a liquid nitrogen output pipeline, a first-stage vaporizer for first-stage vaporization of the liquid nitrogen and a second-stage vaporizer for second-stage vaporization of the liquid nitrogen are connected in sequence along the liquid nitrogen output pipeline, and the second-stage vaporizer is an air vaporizer.

2. The liquid nitrogen vaporization system of claim 1, wherein: The first-stage vaporizer is specifically a water vaporizer, and the water vaporizer has an inner cavity and is provided with a water inlet and a water outlet communicating with the inner cavity.

3. The liquid nitrogen vaporization system of claim 2, wherein: The air vaporizer is accommodated in the inner cavity of the water vaporizer, and the liquid nitrogen output pipeline is connected in sequence with the air vaporizer in the inner cavity of the water vaporizer; when the water outlet discharges all the water in the water vaporizer to the outside, the water vaporizer degenerates into the air vaporizer.

4. The liquid nitrogen vaporization system of claim 3, wherein: The air vaporizer has a finned tube, and the liquid nitrogen output pipeline is connected in sequence with the finned tube.

5. The liquid nitrogen vaporization system of claim 2, wherein: An overflow opening is formed in the top of the inner cavity of the water vaporizer.

6. The liquid nitrogen vaporization system of claim 2, wherein: A water heating device is arranged, and the water heating device supplies high-temperature water to the water vaporizer through the water inlet of the water vaporizer.

7. The liquid nitrogen vaporization system of claim 6, wherein: The water outlet includes a first water outlet leading to the equipment to be cooled, and / or the water outlet includes a second water outlet leading to the outside.

8. The liquid nitrogen vaporization system of claim 7, wherein: The equipment to be cooled supplies water to the water heating device.

9. The liquid nitrogen vaporization system of claim 1, wherein: A liquid nitrogen direct connection pipeline parallel to the water vaporizer is arranged, and the liquid nitrogen tank is directly connected to the air vaporizer along the liquid nitrogen direct connection pipeline.

10. The liquid nitrogen vaporization system of claim 1, wherein: The air vaporizer outputs nitrogen to a nitrogen-using workshop.

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