Long-distance process pipe network purging system and use method thereof

Abstract

The invention provides a long-distance process pipe network purging system and a using method thereof.The long-distance process pipe network purging system comprises a low-temperature liquid storage tank, a vaporizer, a liquid connecting pipe, a gas conveying pipe and a control module; wherein the liquid connecting pipe is connected between the low-temperature liquid storage tank and the vaporizer, and the gas conveying pipe is connected between the vaporizer and a long-distance process pipe network to be purged; moreover, a low-temperature liquid medium is stored in the low-temperature liquid storage tank, the low-temperature liquid medium is introduced into the vaporizer through a liquid connecting pipe, and the vaporizer is used for vaporizing the low-temperature liquid medium to form high-pressure gas; the high-pressure gas is fed into the long-distance process pipe network through the gas conveying pipe, and the long-distance process pipe network is purged based on the control module. The problems that an existing purging scheme is long in construction period, poor in effect and high in cost can be solved.

Description

Technical Field

[0001] This invention relates to the field of industrial installation technology, and more specifically, to a long-distance process pipeline purging system and its usage method. Background Technology

[0002] Air separation units are important auxiliary units in industries such as metallurgy, non-ferrous metals, petrochemicals, coal chemicals, and chemicals, providing high-purity oxygen, nitrogen, and rare gases to the main process units. In actual production, due to process layout considerations, air separation units are usually located far from the main process units, thus requiring long-distance process pipelines to transport product gases from the air separation unit to the main process units.

[0003] Since long-distance process pipelines can reach several kilometers or even tens of kilometers in length, in order to avoid product gas contamination when transported to the main process unit through long-distance process pipelines, the interior of the long-distance process pipelines needs to maintain a high level of cleanliness. Therefore, it is necessary to regularly purge the interior of the long-distance process pipelines.

[0004] For long-distance process pipelines, existing purging methods calculate the required number of air compressors based on the required flow rate and pressure of the purging gas. Typically, a combination of ten or even dozens of air compressors is used to meet the purging needs of long-distance process pipelines. However, due to the large number of air compressors used, the cost of temporary construction power or diesel generators is extremely high; furthermore, it is difficult to simultaneously control the large number of air compressors (such as simultaneously controlling the switches and power), thus making it impossible to achieve intermittent pulse purging, which has a significant impact on the purging effect and project schedule.

[0005] Therefore, there is an urgent need for a long-distance process pipeline purging solution that has good purging effect, relatively short construction period and relatively low cost. Summary of the Invention

[0006] In view of the above problems, the purpose of this invention is to provide a long-distance process pipeline purging system and its usage method to solve the problems of long construction period, poor effect and high cost of existing purging solutions.

[0007] The long-distance process pipeline purging system provided by this invention includes a cryogenic liquid storage tank, a vaporizer, a liquid connecting pipe, a gas delivery pipe, and a control module. The liquid connecting pipe connects the cryogenic liquid storage tank and the vaporizer, and the gas delivery pipe connects the vaporizer and the long-distance process pipeline to be purged. The cryogenic liquid storage tank stores a cryogenic liquid medium, which is introduced into the vaporizer through the liquid connecting pipe. The vaporizer vaporizes the cryogenic liquid medium to form a high-pressure gas. The high-pressure gas is delivered into the long-distance process pipeline through the gas delivery pipe, and the control module is used to purge the long-distance process pipeline.

[0008] Alternatively, a gas regulating valve can be installed on the gas delivery pipe, and a liquid regulating valve can be installed on the liquid connection pipe, both of which are electrically connected to the control module; and...

[0009] The control module adjusts the gas regulating valve and the liquid regulating valve to perform pulsed intermittent purging of the long-distance process pipeline network.

[0010] Alternatively, the cryogenic liquid medium may include an inactive medium.

[0011] Alternatively, the vaporizer may include an air-bath vaporizer or a water-bath vaporizer.

[0012] Alternatively, when the vaporizer is an air bath vaporizer, an axial flow fan is provided on one side of the air bath vaporizer, and the axial flow fan is used to blow air onto the air bath vaporizer.

[0013] Alternatively, when the vaporizer is a water bath vaporizer, warm water is provided inside the water bath vaporizer for heat exchange with the low-temperature liquid medium.

[0014] Alternatively, a steam pipe can be externally connected to the water bath vaporizer.

[0015] Alternatively, a temperature instrument may be provided on the gas delivery pipe and / or the liquid connection pipe; and / or a pressure instrument may be provided on the gas delivery pipe and / or the liquid connection pipe; and / or a flow meter may be provided on the gas delivery pipe and / or the liquid connection pipe.

[0016] On the other hand, the present invention also provides a method for using the aforementioned long-distance process pipeline purging system, the method comprising:

[0017] Pre-processing is performed on the installed long-distance process pipeline purging system to ensure that each component in the long-distance process pipeline purging system meets the preset requirements.

[0018] The vaporizer is used to vaporize the cryogenic liquid medium flowing out of the cryogenic liquid storage tank to form high-pressure gas;

[0019] The high-pressure gas is used to perform pulsed intermittent purging of the long-distance process pipeline network to be purged.

[0020] Alternatively, the pretreatment process for the long-distance process pipeline purging system may include:

[0021] The long-distance process pipeline purging system is back-purged through the gas delivery pipe by an external blowing device to ensure that the cleanliness of the long-distance process pipeline purging system meets the preset requirements.

[0022] Compared with the prior art, the long-distance process pipeline purging system and its usage method provided by the present invention have the following advantages:

[0023] By setting up cryogenic liquid storage tanks, vaporizers, liquid connection pipes, and gas delivery pipes, high-pressure gas (flow) can be generated and blown onto the long-distance process pipeline network to be purged. Using this high-pressure gas (flow) to purge the long-distance process pipeline network not only saves the use of a large number of air compressors and reduces operating costs compared to the existing scheme of using combined air compressors to purge long-distance process pipeline networks, but also enables pulsed intermittent purging of long-distance process pipeline networks, improving purging effect, reducing purging time, and increasing work efficiency.

[0024] To achieve the foregoing and related objectives, one or more aspects of the invention include the features which will be described in detail below and specifically pointed out in the claims. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to include all such aspects and their equivalents. Attached Figure Description

[0025] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings and the contents of the claims, and with a more complete understanding of the invention.

[0026] In the attached diagram:

[0027] Figure 1 This is a connection layout diagram of a long-distance process pipeline purging system provided according to an embodiment of the present invention within a plant area;

[0028] Figure 2 This is a layout diagram of a long-distance process pipeline purging system provided according to an embodiment of the present invention when using an air bath vaporizer;

[0029] Figure 3 This is a layout diagram of a long-distance process pipeline purging system according to an embodiment of the present invention when using a water bath vaporizer;

[0030] Figure 4 This is a pipeline layout diagram of a long-distance process pipeline purging system provided according to an embodiment of the present invention when using an air-bath vaporizer;

[0031] Figure 5This is a pipeline layout diagram of a long-distance process pipeline purging system provided according to an embodiment of the present invention when using a water bath vaporizer;

[0032] Reference numerals: Air separation unit 100, long-distance process pipeline network 200, gas delivery pipe 3, vaporizer 4, air bath vaporizer 41, axial flow fan 42, water bath vaporizer 43, second filling port 44, steam pipe 45, steam tanker 46, switch valve 47, drain valve 48, liquid connection pipe 5, cryogenic liquid storage tank 6, first filling port 61, liquid medium tanker 62, inlet valve 7, liquid medium filling pipe 8, gravel pit 10, first safety valve 11, second safety valve 12, vent valve 13, pressure boosting valve 14, outlet valve 15, drain valve 16, third safety valve 17, liquid regulating valve 18, fourth safety valve 19, vent valve 20, gas regulating valve 21. Detailed Implementation

[0033] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Figure 1 The diagram illustrates the connection layout of a long-distance process pipeline purging system provided according to an embodiment of the present invention within a plant area. Figure 2 The layout of a long-distance process pipeline purging system according to an embodiment of the present invention is shown when using an air-bath vaporizer. Figure 3The layout of a long-distance process pipeline purging system according to an embodiment of the present invention is shown when using a water bath vaporizer. Figure 4 The diagram illustrates the piping layout of a long-distance process pipeline purging system according to an embodiment of the present invention when using an air-bath vaporizer. Figure 5 The piping layout of a long-distance process pipeline purging system according to an embodiment of the present invention is shown when using a water bath vaporizer.

[0036] Combination Figures 1 to 5 It is understood that the long-distance process pipeline purging system provided by the present invention includes a cryogenic liquid storage tank 6, a vaporizer 4, a liquid connection pipe 5, and a gas delivery pipe 3; wherein, the cryogenic liquid storage tank 6 is used to store high-pressure cryogenic liquid media (the cryogenic liquid media is liquid in a low-temperature and high-pressure environment, and as the temperature rises or the pressure decreases, the cryogenic liquid media may be transformed into a gaseous media, such as nitrogen, inert gas, etc.).

[0037] The vaporizer 4 is used to exchange heat with the cryogenic liquid medium, raising its temperature and thus transforming it into a room-temperature gaseous medium. As the cryogenic liquid medium transforms into a room-temperature gaseous medium, its volume increases further, thereby increasing the internal pressure of the high-pressure gas formed by the room-temperature gaseous medium, which improves the subsequent purging effect on the long-distance process pipeline 200.

[0038] Both the liquid connection pipe 5 and the gas delivery pipe 3 are connecting pipes. The liquid connection pipe 5 is connected between the cryogenic liquid storage tank 6 and the vaporizer 4, so that the cryogenic liquid medium in the cryogenic liquid storage tank 6 flows to the vaporizer. The gas delivery pipe 3 is connected between the vaporizer 4 and the long-distance process pipeline network 200 to be purged next to the air separation unit 100, so that the high-pressure gas generated by the vaporizer 4 flows to the long-distance process pipeline network 200 to purge the long-distance process pipeline network 200.

[0039] It should be noted that, for the medium stored in the cryogenic liquid storage tank 6, the solution provided by this invention preferentially selects inactive media that are liquid at low temperatures, such as nitrogen, inert media (such as helium, neon, argon, etc.). Inactive media that are liquid at low temperatures have strong stability and, under normal circumstances, will not react with substances in the air, nor will they react with residual product gases in the long-distance process pipeline network 200, thus ensuring the safe operation of the entire system.

[0040] In a specific embodiment of the present invention, in order to control the flow rate of high-pressure gas and the flow rate of cryogenic liquid medium, a gas regulating valve 21 can be installed on the gas delivery pipe 3 and a liquid regulating valve 18 can be installed on the liquid connection pipe 5. In actual use, the flow rate of high-pressure gas blown out of the gas delivery pipe 3 can be controlled (or even shut off) by adjusting the gas regulating valve 21 and the liquid regulating valve 18, so that the gas delivery pipe 3 blows out high-pressure gas as needed to purge the long-distance process pipeline network 200, thereby realizing pulsed intermittent purging of the long-distance process pipeline network 200 and improving the purging effect of the long-distance process pipeline network 200. Of course, in order to realize the automated pulse-type intermittent purging of long-distance process pipelines by the long-distance process pipeline purging system provided by the present invention, the long-distance process pipeline purging system provided by the present invention may also include a control module. The gas regulating valve and the liquid regulating valve may be electrically controlled magnetic valves, and the gas regulating valve and the liquid regulating valve are electrically connected to the control module. In actual use, the gas regulating valve and the liquid regulating valve are controlled by the preset program of the control module to realize the automated pulse-type intermittent purging of long-distance process pipelines.

[0041] Furthermore, for the cryogenic liquid storage tank 6, in order to fill it with cryogenic liquid medium, a liquid medium filling pipe 8 can be connected to the cryogenic liquid storage tank 6. The end of the liquid medium filling pipe 8 away from the cryogenic liquid storage tank 6 is provided with a first filling port 61. The liquid medium filling pipe 8 is connected to the external liquid medium tank truck 62 through the first filling port 61. In addition, an inlet valve 7 is also provided on the liquid medium filling pipe 8. In actual process, when the inlet valve 7 is opened, the liquid medium tank truck 62 will fill the cryogenic liquid medium into the cryogenic liquid storage tank 6 through the liquid medium filling pipe 8.

[0042] In addition, the cryogenic liquid storage tank 6 can also be equipped with a vent valve 13, a pressure boosting valve 14, and multiple safety valves (such as a first safety valve 11 and a second safety valve 12). The vent valve 13 is used to discharge other impurities and gases from the cryogenic liquid storage tank 6 when it is filled with cryogenic liquid medium. The pressure boosting valve 14 is used to boost the pressure in the cryogenic liquid storage tank 6 when the pressure is insufficient (such as by using a liquid medium tank truck 62). The safety valve is used to actively open and depressurize the cryogenic liquid storage tank 6 when the pressure in the cryogenic liquid storage tank 6 is too high.

[0043] In addition, for the liquid connection pipe 5, not only can a liquid regulating valve 18 be installed, but also an outlet valve 15 can be installed at its connection end with the cryogenic liquid storage tank 6, a drain valve 16 can be installed at its lowest point, and a third safety valve 17 can be installed in its middle. The outlet valve 15 is used to control the flow rate of the cryogenic liquid medium flowing out of the cryogenic liquid storage tank 6, the drain valve 16 is used to discharge the residual cryogenic liquid medium in the liquid connection pipe 5 into the gravel pit 10 after work is completed, and the third safety valve 17 is used to depressurize the liquid connection pipe 5 during operation. For the gas delivery pipe 3, not only can a gas regulating valve 21 be installed, but also a vent valve 20 and a fourth safety valve 19 can be installed. The vent valve 20 is used to discharge the residual gas in the gas delivery pipe 3 after work is completed, and the fourth safety valve 19 is used to depressurize the gas delivery pipe 3 during operation.

[0044] It should be noted that for each pipeline component (such as the cryogenic liquid storage tank 6, gas delivery pipe 3, liquid connection pipe 5, etc.) in the long-distance process pipeline purging system provided by this invention, temperature instruments, pressure instruments, flow meters, etc. (not shown in the figure) can be installed on them. These instruments monitor the internal temperature, pressure, and flow rate of each pipeline component, ensuring the normal operation of the entire long-distance process pipeline purging system. For example, temperature instruments, pressure instruments, and flow meters can be installed on both the gas delivery pipe and the liquid connection pipe to monitor the internal temperature, pressure, and flow rate of both. Alternatively, instruments of the required types can be installed separately for the gas delivery pipe and the liquid connection pipe as needed. For example, only pressure instruments and flow meters can be installed on the gas delivery pipe (without temperature instruments), and only temperature instruments and pressure instruments can be installed on the liquid connection pipe (without flow meters).

[0045] In an optional embodiment of the present invention, the vaporizer may be an air-bath vaporizer 41. The air-bath vaporizer 41 uses room temperature air to exchange heat with the cryogenic liquid medium, converting the cryogenic liquid medium into a room temperature gaseous medium, thereby forming a high-pressure gas (flow). In practice, to further improve the heat exchange efficiency of the air-bath vaporizer 41 with the cryogenic liquid medium, an axial flow fan 42 can be installed on one side of the air-bath vaporizer 41. The axial flow fan 42 blows air into the air-bath vaporizer 41, accelerating air circulation and thus speeding up the heat exchange between the air-bath vaporizer 41 and the cryogenic liquid medium, improving the heat exchange effect.

[0046] In another optional embodiment of the present invention, a water bath vaporizer 43 may also be used as the vaporizer. Warm water is provided inside the water bath vaporizer 43, and the water bath vaporizer 43 exchanges heat with the low-temperature liquid medium through the warm water, converting the low-temperature liquid medium into a normal-temperature gaseous medium, thereby forming a high-pressure gas (flow). In actual operation, the warm water can be connected to an external steam pipe 45. The end of the steam pipe 45 away from the water bath vaporizer 43 is connected to a steam tanker 46 through a second filling port 44. The steam tanker continuously supplies steam to the warm water inside the water bath vaporizer 43 through the steam pipe 45, ensuring that the temperature of the warm water remains within a preset temperature range, thereby ensuring that the heat exchange between the warm water and the low-temperature liquid medium in the water bath vaporizer 43 proceeds normally.

[0047] In addition, to facilitate the control of the steam flow rate of the steam tanker into the warm water in the water bath vaporizer 43 through the steam pipe 45, a switch valve 47 can be installed on the steam pipe 45 to control the flow rate of the steam pipe 45; and to facilitate the discharge of the warm water in the water bath vaporizer 43 after the entire system has finished working, a drain valve 48 can be installed at the bottom of the water bath vaporizer 43 to discharge the warm water in the water bath vaporizer 43.

[0048] On the other hand, to illustrate the working principle of the long-distance process pipeline purging system provided by the present invention, the present invention also provides a method for using the aforementioned long-distance process pipeline purging system, the method comprising:

[0049] The installed long-distance process pipeline purging system undergoes pretreatment to ensure that all components meet preset requirements. A vaporizer is used to vaporize the cryogenic liquid medium flowing from the cryogenic liquid storage tank 6 to form high-pressure gas. This high-pressure gas is then used to perform pulsed, intermittent purging of the long-distance process pipeline 200 to be purged. The pretreatment process includes: reverse purging the long-distance process pipeline purging system via an external blowing device (such as an air compressor) through the gas delivery pipe 3 to ensure that the cleanliness of the long-distance process pipeline purging system meets preset requirements.

[0050] The following describes in detail the installation and construction process of the long-distance process pipeline purging system provided by the present invention through examples.

[0051] Example 1 (In this example, liquid nitrogen is selected as the cryogenic liquid medium)

[0052] Step 1: Establish the long-distance process pipeline purging system provided by this invention, including the preparation of various components; wherein, during the preparation process, it is necessary to ensure that subsequent liquid nitrogen (a cryogenic liquid medium) enters the liquid nitrogen storage tank (i.e., the cryogenic liquid storage tank provided by this invention) through the first filling port, and after the liquid level in the liquid nitrogen storage tank is stable, it can be released from the liquid connection pipe through the outlet valve; the liquid nitrogen storage tank can be connected to the vaporizer through the liquid connection pipe, and a liquid regulating valve, a drain valve and a safety valve are installed on the connected liquid connection pipe; after the liquid nitrogen passes through the vaporizer, it is vaporized into nitrogen gas through heat exchange, and is connected to the long-distance process pipeline to be purged through the gas delivery pipe.

[0053] Step 2: Install the long-distance process pipeline purging system provided by this invention and perform pretreatment;

[0054] According to the process flow, install all equipment, pipelines, valves, and related instruments within the long-distance process pipeline purging system. After instrument installation, temporary electrical connections should be used to connect the temperature, pressure, and flow rate instruments on the liquid nitrogen storage tank and pipelines to control the temperature, pressure, and flow rate during liquid nitrogen filling and vaporization. To ensure the internal cleanliness of the process pipeline network, the purging system equipment, pipelines, valves, and related instruments must undergo degreasing treatment (i.e., cleaning treatment) before installation. After installation, the gas from the vaporizer... Connect the delivery pipe to an air compressor to perform back purging of the entire long-distance process pipeline network until the cleanliness of the purging system meets the preset requirements. During back purging with the air compressor, the safety valves on the liquid connection pipe and the liquid nitrogen storage tank should be removed and sealed with blind flanges. The purging gas flow rate should be controlled at 20-30 m / s, and the purging gas pressure should be controlled at 0.35-0.50 MPa. After the back purging is completed, restore the equipment and pipelines, and keep the liquid nitrogen storage tank, liquid connection pipe, and liquid medium filling pipe cold.

[0055] Step 3: Liquid nitrogen filling;

[0056] Open the inlet valve and vent valve of the liquid nitrogen storage tank, and close the outlet valve and pressurization valve. Use a liquid nitrogen tanker truck to fill the liquid nitrogen storage tank through the first filling port. During the filling process, the liquid nitrogen pressure should be controlled at around 0.45 MPa. During the filling process, the liquid nitrogen level, temperature, pressure and other instrument data of the liquid nitrogen storage tank should be closely monitored.

[0057] Step 4: Vaporization treatment;

[0058] After liquid nitrogen filling is complete, close the inlet valve and vent valve, then open the outlet valve, liquid regulating valve, and gas regulating valve in sequence. The liquid nitrogen enters the vaporizer along the liquid connection pipe for heat exchange, ultimately vaporizing into nitrogen gas. For air-bath vaporizers, an axial flow fan can be turned on to accelerate the heat exchange efficiency of the air-bath vaporizer with liquid nitrogen. Furthermore, when the temperature is below -5℃, an electric heating auxiliary device should be used to maintain the heat exchange efficiency of the air-bath vaporizer. For water-bath vaporizers, a steam tanker truck with steam pipes is used to heat the water inside the water-bath vaporizer to improve its heat exchange efficiency with liquid nitrogen. It should be noted that the temperature of the water inside the water-bath vaporizer is preferably maintained at 60-70℃, which avoids excessive waste of steam resources while ensuring a high heat exchange efficiency for liquid nitrogen.

[0059] Step 5: System purging;

[0060] Open the valve (such as a gas regulating valve) between the gas delivery pipe and the long-distance process pipeline network to begin purging. During the actual purging process, operate using a pattern of 2 days of full-volume purging followed by 1-2 days of intermittent pulse purging, with an interval of 15-20 minutes between pulse purgings. Install a precision filter at the purging port (outlet). After purging again, check the precision filter until no purged debris remains, then stop purging (for example, cover the purging port with a white cloth until the cloth is free of rust and debris). It should be noted that for long-distance process pipeline networks, they can be segmented using blind flanges and isolation measures, with each segment having a corresponding nitrogen inlet and outlet. Purging should be performed on each segment separately to improve the purging effect. It should be noted that, to ensure safety, the purging area (such as the corresponding area of ​​a long-distance process pipeline network) and the filling area (the corresponding area of ​​the long-distance process pipeline network purging system provided by this invention) should be isolated by rigid enclosures, and the purging port should be connected to the high altitude using a short pipe; when checking the purging results, the operators should wear an oxygen analyzer.

[0061] Step 6: Pipeline restoration;

[0062] After the purging inspection is passed, close the outlet valve and liquid regulating valve of the liquid nitrogen storage tank, open the drain valve, and discharge the residual liquid nitrogen in the liquid connection pipe into the gravel pit; close the gas regulating valve, open the vent valve 20, and discharge the residual gas in the gas delivery pipe; vent the nitrogen in the pipes inside the vaporizer; then remove the blind flanges and isolation measures of the process piping network, and remove the gas delivery pipe, vaporizer, liquid connection pipe and other components, and connect the outlet valve of the liquid nitrogen storage tank to other formal pipelines.

[0063] As can be seen from the above specific embodiments, the long-distance process pipeline purging system and its usage method provided by the present invention have at least the following advantages:

[0064] 1. By setting up a long-distance process pipeline purging system that includes cryogenic liquid storage tanks, vaporizers, liquid connection pipes and gas transmission pipes, the cost is lower, the safety is stronger and the purging efficiency is higher than that of traditional solutions, and the construction period can be effectively reduced.

[0065] 2. The long-distance process pipeline purging system provided by this invention has a large flow rate, stable pressure, and good controllability. It can perform pulsed intermittent purging of long-distance process pipelines through the control module.

[0066] 3. By installing a vaporizer (including an air bath vaporizer or a water bath vaporizer), the conversion of low-temperature liquid media into high-pressure gas can be accelerated, thereby further improving the purging effect of the long-distance process pipeline purging system.

[0067] As per the above reference Figures 1 to 5 The long-distance process pipeline purging system and its method of use according to the present invention are described by way of example. However, those skilled in the art should understand that various modifications can be made to the long-distance process pipeline purging system and its method of use proposed in the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A long-distance process pipeline purging system; characterized in that, It includes a cryogenic liquid storage tank, a vaporizer, liquid connection pipes, gas delivery pipes, and a control module; among which, The liquid connection pipe connects the cryogenic liquid storage tank and the vaporizer, and the gas delivery pipe connects the vaporizer and the long-distance process piping network to be purged; furthermore... The cryogenic liquid storage tank stores a cryogenic liquid medium, which is introduced into the vaporizer through the liquid connection pipe. The vaporizer is used to vaporize the cryogenic liquid medium to form a high-pressure gas. The high-pressure gas is delivered into the long-distance process pipeline network through the gas delivery pipe, and the long-distance process pipeline network is purged based on the control module.

2. The long-distance process pipeline purging system as described in claim 1, characterized in that, A gas regulating valve is installed on the gas delivery pipe, and a liquid regulating valve is installed on the liquid connection pipe. Both the gas regulating valve and the liquid regulating valve are electrically connected to the control module. The control module adjusts the gas regulating valve and the liquid regulating valve to perform pulsed intermittent purging of the long-distance process pipeline network.

3. The long-distance process pipeline purging system as described in claim 2, characterized in that, The cryogenic liquid medium includes inactive media.

4. The long-distance process pipeline purging system as described in claim 3, characterized in that, The vaporizer includes an air bath vaporizer or a water bath vaporizer.

5. The long-distance process pipeline purging system as described in claim 4, characterized in that, When the vaporizer is an air bath vaporizer, an axial flow fan is provided on one side of the air bath vaporizer, and the axial flow fan is used to blow air onto the air bath vaporizer.

6. The long-distance process pipeline purging system as described in claim 4, characterized in that, When the vaporizer is a water bath vaporizer, warm water is provided inside the water bath vaporizer, and the warm water is used to exchange heat with the low-temperature liquid medium.

7. The long-distance process pipeline purging system as described in claim 6, characterized in that, A steam pipe is connected to the water bath vaporizer.

8. The long-distance process pipeline purging system as described in claim 1, characterized in that, A temperature instrument is provided on the gas delivery pipe and / or the liquid connection pipe; and / or, A pressure gauge is installed on the gas delivery pipe and / or the liquid connection pipe; and / or, A flow meter is installed on the gas delivery pipe and / or the liquid connection pipe.

9. A method of using a long-distance process pipeline purging system as described in any one of claims 1 to 8, characterized in that, include: Pre-processing is performed on the installed long-distance process pipeline purging system to ensure that each component in the long-distance process pipeline purging system meets the preset requirements. The vaporizer is used to vaporize the cryogenic liquid medium flowing out of the cryogenic liquid storage tank to form high-pressure gas; The high-pressure gas is used to perform pulsed intermittent purging of the long-distance process pipeline network to be purged.

10. The method of using the long-distance process pipeline purging system as described in claim 9, characterized in that, The pretreatment process for the long-distance process pipeline purging system includes: The long-distance process pipeline purging system is back-purged through the gas delivery pipe by an external blowing device to ensure that the cleanliness of the long-distance process pipeline purging system meets the preset requirements.

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