Liquid nitrogen vaporization system for long-distance pipeline purging

Abstract

The utility model relates to a liquid nitrogen vaporization system for purging a long-distance pipeline, which comprises a liquid nitrogen storage device, a water bath vaporization device, steam transportation equipment and a vaporization pipeline connected with the long-distance pipeline, the steam transportation equipment is communicated with the water bath vaporizing device through a steam pipeline, and at least part of the vaporizing pipeline is in contact with steam in the water bath vaporizing device. The liquid nitrogen vaporization system provided by the utility model solves the problem that the existing liquid nitrogen vaporization equipment is difficult to provide a large amount of nitrogen to a long-distance pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid nitrogen vaporization equipment technical field especially relates to a liquid nitrogen vaporization system for long -distance pipeline purging. BACKGROUND

[0002] At present, the industrial gas required by many industrial park enterprises is usually supplied by external gas companies using the public pipe gallery of the park. Generally, the gas supply plant is located far away from the center of the park, so the length of the public pipe gallery pipeline is usually several kilometers or even tens of kilometers. Before the pipeline is handed over and put into operation, it needs to be purged. Long -distance pipeline purging usually needs to be carried out dozens of times and needs to reach the required flow rate of 20 m / s. A large amount of nitrogen gas source is required. At this time, liquid nitrogen needs to be purchased for vaporization to provide the gas source. However, a large amount of liquid nitrogen vaporization is difficult to achieve by air temperature heat exchange. SUMMARY

[0003] The main purpose of the utility model is to provide a liquid nitrogen vaporization system for long -distance pipeline purging, which aims to solve the problem that the existing liquid nitrogen vaporization equipment cannot provide a large amount of nitrogen gas to the long -distance pipeline.

[0004] To achieve the above purpose, the utility model provides a liquid nitrogen vaporization system for long -distance pipeline purging, which comprises a liquid nitrogen storage device, a water bath vaporization device, a steam transportation equipment and a vaporization pipeline connected with the long -distance pipeline. The liquid nitrogen storage device is connected with the vaporization pipeline. The steam transportation equipment is communicated with the water bath vaporization device through a steam pipeline. The vaporization pipeline is at least partially in contact with the steam in the water bath vaporization device.

[0005] According to some embodiments of the utility model, the vaporization pipeline comprises a first pipeline section, a second pipeline section and a third pipeline section connected with the long -distance pipeline. The first pipeline section is connected with the bottom of the liquid nitrogen storage device. The second pipeline section is in contact with the steam in the water bath vaporization device. The first pipeline section and the third pipeline section are communicated through the second pipeline section.

[0006] According to some embodiments of the utility model, a self -pressurizing vaporization device is further included. The liquid nitrogen storage device has a vacuum cavity capable of storing liquid nitrogen. One end of the self -pressurizing vaporization device is communicated with the bottom of the vacuum cavity, and the other end is communicated with the top of the vacuum cavity through a pressure regulating valve. A nitrogen gas pressure detection part is arranged on the third pipeline section. The pressure regulating valve and the nitrogen gas pressure detection part are electrically connected with the controller.

[0007] According to some embodiments of the utility model, a nitrogen gas flow regulating valve and a nitrogen gas flow detection part are arranged on the third pipeline section. The nitrogen gas flow detection part is located on the gas outlet side of the nitrogen gas flow regulating valve. The nitrogen gas flow regulating valve and the nitrogen gas flow detection part are electrically connected with the controller.

[0008] According to some embodiments of the present application, a steam flow regulating valve is connected to the steam pipeline, a nitrogen temperature detecting part is arranged on the third pipeline section, and the steam flow regulating valve and the nitrogen temperature detecting part are electrically connected to the controller.

[0009] According to some embodiments of the present application, the second pipeline section is arranged in a wavy shape.

[0010] According to some embodiments of the present application, a plurality of gas outlets are arranged on the steam pipeline, the plurality of gas outlets are located in the water bath vaporization device, and are arranged at intervals in the length direction of the steam pipeline.

[0011] According to some embodiments of the present application, a drain pipe is connected to the bottom of the water bath vaporization device.

[0012] According to some embodiments of the present application, the steam pipeline is at least partially arranged in a hose shape.

[0013] According to some embodiments of the present application, a plurality of steam transportation devices are arranged, and each steam transportation device is communicated with the water bath vaporization device through the steam pipeline.

[0014] The present application has at least the following advantages:

[0015] In the present application, hot steam is transported into the water bath vaporization device by the steam transportation device, and the liquid nitrogen stored in the liquid nitrogen storage device is output into the vaporization pipeline. Since the vaporization pipeline is at least partially in contact with the steam in the water bath vaporization device, when the liquid nitrogen flows through the vaporization pipeline in the water bath vaporization device, it exchanges heat with the hot steam in the water bath vaporization device. The steam releases heat during the liquefaction process, and continues to exchange heat with the liquid nitrogen after being liquefied into hot water. The liquid nitrogen is vaporized into nitrogen gas after absorbing heat, and the nitrogen gas is output into the long pipeline for purging. In the present application, hot steam is directly transported into the water bath vaporization device by the steam transportation device, and the liquid nitrogen is vaporized by the water bath method. Compared with the air temperature heat exchange method, the temperature of the hot steam is higher than that of the air, and the heat exchange efficiency is higher, so that a large amount of nitrogen gas is transported into the long pipeline for purging. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 A structure schematic view of a liquid nitrogen vaporization system for long pipeline purging is provided in the embodiment of the present application.

[0018] Marked for explanation:

[0019] 100-liquid nitrogen vaporization system; 1-liquid nitrogen storage device; 11-vacuum cavity; 12-liquid level meter; 13-pressure relief valve; 2-water bath vaporization device; 21-drain pipe; 3-steam transportation equipment; 4-vaporization pipeline; 41-first pipeline section; 42-second pipeline section; 43-third pipeline section; 431-nitrogen pressure detection part; 432-nitrogen flow regulating valve; 433-nitrogen flow detection part; 434-nitrogen temperature detection part; 5-steam pipeline; 51-steam flow regulating valve; 52-gas outlet; 6-self-pressurizing vaporization device; 61-pressure regulating valve; 62-pressure gauge; 200-long pipeline. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiment of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0021] It should be noted that if the embodiment of the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0022] In addition, if the embodiment of the present application involves the description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes. In addition, the technical schemes of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art. When the combination of technical schemes appears contradictory or unachievable, it should be considered that the combination of technical schemes does not exist, and is not within the protection scope required by the present application.

[0023] The utility model provides a liquid nitrogen vaporization system for long pipeline blowing, Figure 1 The utility model provides a liquid nitrogen vaporization system for long pipeline blowing.

[0024] As Figure 1 The utility model discloses a liquid nitrogen vaporization system for long pipeline 200 blowing, including liquid nitrogen storage device 1, water bath vaporization device 2, steam transportation equipment 3 and with long pipeline 200 connection's vaporization pipeline 4, liquid nitrogen storage device 1 with vaporization pipeline 4 is connected, steam transportation equipment 3 with water bath vaporization device 2 is communicated through steam pipeline 5, and vaporization pipeline 4 is at least partially contacted with steam in water bath vaporization device 2.

[0025] In the utility model, steam transportation equipment 3 transports hot steam to water bath vaporization device 2, and the liquid nitrogen stored in liquid nitrogen storage device 1 is output to vaporization pipeline 4, because vaporization pipeline 4 is at least partially contacted with steam in water bath vaporization device 2, when liquid nitrogen flows through vaporization pipeline 4 in water bath vaporization device 2, it exchanges heat with hot steam in water bath vaporization device 2, steam releases heat in the liquefaction process, and continues to exchange heat with liquid nitrogen after being liquefied as hot water, liquid nitrogen is vaporized as nitrogen gas after absorbing heat, and the nitrogen gas is output to long pipeline 200 to blow long pipeline 200.

[0026] It should be noted that steam transportation equipment 3 can be a mobile steam car.

[0027] Further, in some embodiments, as Figure 1 The steam pipeline 5 is at least partially provided in the form of a hose. Because the mobile steam car needs to transport hot steam from the hot steam storage point to the vicinity of the water bath vaporization device 2 first, and then be connected with the steam pipeline 5, it cannot be guaranteed that the mobile steam car can stop at the specified position every time, therefore, the steam pipeline 5 is at least partially provided in the form of a hose, so that the parking position of the mobile steam car is not limited.

[0028] Because a large amount of nitrogen gas is needed to blow long pipeline 200, in order to avoid the insufficient amount of hot steam exchanged with liquid nitrogen, in some embodiments, as Figure 1As shown, the steam transportation device 3 is provided with multiple, each of which is communicated with the water bath vaporization device 2 through the steam pipeline 5. In this way, the number of steam transportation devices 3 is increased to meet the heat exchange requirement of a large amount of liquid nitrogen.

[0029] In some embodiments, as Figure 1 As shown, the steam pipeline 5 is provided with multiple gas outlets 52, which are located in the water bath vaporization device 2 and are arranged at intervals in the length direction of the steam pipeline 5. In this way, the number of gas outlets 52 is increased so that hot steam can be output from multiple gas outlets 52, the flow rate of hot steam is slowed down, the heat exchange time of hot steam and liquid nitrogen in the vaporization pipeline 4 is prolonged, and the vaporization efficiency of liquid nitrogen is improved.

[0030] The hot steam after completing heat exchange with liquid nitrogen will be liquefied into warm water, which will absorb heat after being in contact with newly input hot steam. In order to ensure the efficiency of the water bath vaporization device 2 in vaporizing liquid nitrogen, in some embodiments, as Figure 1 As shown, the bottom of the water bath vaporization device 2 is connected with a drain pipe 21. In this way, the warm water after heat exchange is drained, so that the water bath vaporization device 2 always maintains a high temperature, and the vaporization efficiency of liquid nitrogen is improved.

[0031] The specific structure of the vaporization pipeline 4 is not limited, as long as it is at least partially immersed in hot water in the water bath vaporization device 2, for example, in some embodiments, as Figure 1 As shown, the vaporization pipeline 4 includes a first pipeline segment 41, a second pipeline segment 42, and a third pipeline segment 43 connected with the long pipeline 200, the first pipeline segment 41 is connected with the bottom of the liquid nitrogen storage device 1, the second pipeline segment 42 is in contact with steam in the water bath vaporization device 2, and the first pipeline segment 41 and the third pipeline segment 43 are communicated through the second pipeline segment 42. In this way, since the first pipeline segment 41 is connected with the bottom of the liquid nitrogen storage device 1, it is ensured that the liquid nitrogen stored in the liquid nitrogen storage device 1 can be completely output.

[0032] Specifically, the liquid nitrogen storage device 1 is provided with a liquid level meter 12, and generally, the liquid nitrogen storage device 1 will store an amount of liquid nitrogen for twice nitrogen purging of the long pipeline 200. When the liquid level meter 12 detects that the liquid nitrogen in the liquid nitrogen storage device 1 is half, it means that the long pipeline 200 has been purged with enough nitrogen.

[0033] For long pipelines 200 of different lengths, the speed of nitrogen purging is different, and the speed of nitrogen purging is related to the pressure and flow rate of nitrogen, so in some embodiments, as Figure 1As shown, the liquid nitrogen vaporization system 100 further comprises a self-pressurized vaporization device 6, the liquid nitrogen storage device 1 has a vacuum cavity 11 capable of storing liquid nitrogen, one end of the self-pressurized vaporization device 6 communicates with the bottom of the vacuum cavity 11, the other end communicates with the top of the vacuum cavity 11 through a pressure regulating valve 61, the third pipeline segment 43 is provided with a nitrogen pressure detection part 431, and the pressure regulating valve 61 and the nitrogen pressure detection part 431 are electrically connected with a controller. In this way, a small amount of liquid nitrogen enters the self-pressurized vaporization device 6, vaporizes into nitrogen gas and returns to the vacuum cavity 11, the amount of nitrogen gas entering the vacuum cavity 11 is adjusted through the pressure regulating valve 61, so as to adjust the pressure of the liquid nitrogen, since the pressure of the liquid nitrogen is consistent with the pressure of the nitrogen gas after the liquid nitrogen vaporizes, the pressure regulating valve 61 can adjust the pressure of the purge nitrogen gas, and since the pressure regulating valve 61 and the nitrogen pressure detection part 431 are electrically connected with the controller, the pressure regulating valve 61 can be adjusted in real time according to the nitrogen pressure value detected by the nitrogen pressure detection part 431.

[0034] Specifically, the self-pressurized vaporization device 6 is an air temperature type self-pressurized vaporizer, which is a prior art and will not be described in detail.

[0035] It should be noted that a pressure gauge 62 is arranged on the pipeline connecting the pressure regulating valve 61 and the vacuum cavity 11, since the pressure regulating valve 61 cannot directly adjust the pressure of the purge nitrogen gas, the pressure of the nitrogen gas returning to the vacuum cavity 11 is detected through the pressure gauge 62, so as to avoid over-adjustment of the pressure regulating valve 61.

[0036] Further, in some embodiments, as shown in Figure 1 As shown, the vacuum cavity 11 communicates with the outside through a pressure relief valve 13, when the pressure in the vacuum cavity 11 is too large, the pressure in the vacuum cavity 11 can be quickly reduced by opening the pressure relief valve 13.

[0037] Further, in some embodiments, as shown in Figure 1 As shown, the third pipeline segment 43 is provided with a nitrogen flow regulating valve 432 and a nitrogen flow detection part 433, the nitrogen flow detection part 433 is located on the gas outlet side of the nitrogen flow regulating valve 432, and the nitrogen flow regulating valve 432 and the nitrogen flow detection part 433 are electrically connected with a controller. In this way, the nitrogen flow regulating valve 432 can be adjusted in real time according to the nitrogen flow value detected by the nitrogen flow detection part 433, so as to adapt to the purge requirements of long pipelines 200 of different lengths. It should be noted that the nitrogen flow detection part 433 has a cumulative function, when the cumulative flow of the nitrogen gas meets the requirements of purging the long pipeline 200, the nitrogen flow regulating valve 432 is controlled to be closed, so as to avoid waste of nitrogen gas.

[0038] Since liquid nitrogen can be completely vaporized into nitrogen gas only by rising to a certain temperature, in order to avoid waste of hot steam, in some embodiments, as shown in Figure 1 The steam pipeline 5 is connected with a steam flow regulating valve 51, and the third pipeline segment 43 is provided with a nitrogen gas temperature detection part 434, and the steam flow regulating valve 51 and the nitrogen gas temperature detection part 434 are electrically connected with a controller. In this way, when the nitrogen gas temperature detection part 434 detects that the purging nitrogen gas reaches a preset temperature, it indicates that the liquid nitrogen can be completely vaporized into nitrogen gas at this time, the flow of steam is adjusted through the steam flow regulating valve 51, so that the water bath vaporization device 2 is maintained at the current temperature, thereby improving the utilization rate of hot steam.

[0039] In some embodiments, as shown in Figure 1 The second pipeline segment 42 is arranged in a wavy shape. In this way, by increasing the contact area of the second pipeline segment 42 with the hot steam, the heat exchange efficiency of the liquid nitrogen and the hot steam is improved, thereby improving the vaporization efficiency of the liquid nitrogen.

[0040] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid nitrogen vaporization system for purging long-distance pipelines, characterized in that, It includes a liquid nitrogen storage device, a water bath vaporization device, a steam transport device, and a vaporization pipeline connected to a long-distance pipeline. The liquid nitrogen storage device is connected to the vaporization pipeline, and the steam transport device is connected to the water bath vaporization device through a steam pipeline. The vaporization pipeline is at least partially in contact with the steam in the water bath vaporization device.

2. The liquid nitrogen vaporization system as described in claim 1, characterized in that, The vaporization pipeline includes a first pipeline section, a second pipeline section, and a third pipeline section connected to the long-distance pipeline. The first pipeline section is connected to the bottom of the liquid nitrogen storage device, and the second pipeline section is in contact with the steam in the water bath vaporization device. The first pipeline section and the third pipeline section are connected through the second pipeline section.

3. The liquid nitrogen vaporization system as described in claim 2, characterized in that, It also includes a self-pressurizing vaporization device. The liquid nitrogen storage device has a vacuum chamber for storing liquid nitrogen. One end of the self-pressurizing vaporization device is connected to the bottom of the vacuum chamber, and the other end is connected to the top of the vacuum chamber through a pressure regulating valve. A nitrogen pressure detection unit is provided on the third pipeline section. Both the pressure regulating valve and the nitrogen pressure detection unit are electrically connected to the controller.

4. The liquid nitrogen vaporization system as described in claim 2, characterized in that, The third pipeline section is equipped with a nitrogen flow regulating valve and a nitrogen flow detection unit. The nitrogen flow detection unit is located on the outlet side of the nitrogen flow regulating valve, and both the nitrogen flow regulating valve and the nitrogen flow detection unit are electrically connected to the controller.

5. The liquid nitrogen vaporization system as described in claim 2, characterized in that, A steam flow regulating valve is connected to the steam pipeline, and a nitrogen temperature detection unit is provided on the third pipeline section. Both the steam flow regulating valve and the nitrogen temperature detection unit are electrically connected to the controller.

6. The liquid nitrogen vaporization system as described in claim 2, characterized in that, The second pipe section is designed with a wavy, curved shape.

7. The liquid nitrogen vaporization system as described in claim 1, characterized in that, The steam pipe has multiple air outlets located inside the water bath vaporization device and spaced apart along the length of the steam pipe.

8. The liquid nitrogen vaporization system as described in claim 1, characterized in that, The bottom of the water bath vaporization device is connected to a drain pipe.

9. The liquid nitrogen vaporization system as described in claim 1, characterized in that, The steam pipe is at least partially configured as a flexible hose.

10. The liquid nitrogen vaporization system as described in claim 1, characterized in that, The steam transport equipment is provided in multiple units, and each of the steam transport equipment is connected to the water bath vaporization device through the steam pipeline.

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