Deicing device and deicing method thereof

Abstract

The present invention provides a deicing device and a deicing method thereof, and relates to the field of carbon dioxide storage technology. The deicing device includes a base, a device group, a pipeline group and a valve group. The device group is arranged on the base, and the device group includes a vaporizer and a pipeline heater; the pipeline group includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the vaporizer is connected to the first pipeline and the second pipeline respectively, the pipeline heater is connected to the second pipeline and the third pipeline respectively, the fourth pipeline is connected to the second pipeline and the third pipeline respectively, the end of the first pipeline away from the vaporizer is used to connect to the gas phase port of the nitrogen cylinder, the carbon dioxide cylinder and the storage tank respectively, and the end of the third pipeline away from the pipeline heater is used to connect to the liquid phase port of the storage tank; the valve group is arranged on the pipeline group. The deicing device provided by the present invention effectively reduces the waste of nitrogen and carbon dioxide gases, improves the deicing efficiency, is simple to operate, and has no risk of secondary icing.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide storage, and in particular to a deicing device and a deicing method thereof. Background Art

[0002] As an industrial gas, carbon dioxide is almost everywhere in factories. Bottled gas is currently widely used. Due to the huge amount of use, the gas cylinders need to be replaced frequently, and the transportation and labor costs are high. Therefore, it is gradually replaced by large-volume cryogenic storage tanks. Improper storage and use of liquid carbon dioxide will cause the carbon dioxide storage tank to lose pressure, and the liquid carbon dioxide inside will be converted into dry ice. Once it becomes dry ice, it cannot be used and the storage tank needs to be de-iced. There are currently two main methods for removing dry ice. The first is to directly blow it with hot nitrogen until the dry ice inside is completely vaporized. The second method is to pass carbon dioxide gas into the storage tank through a tank truck to gradually melt the dry ice.

[0003] However, the first method of direct purging with hot nitrogen generally takes 10 to 14 days to completely remove 2 cubic meters of dry ice. This method uses the heat of hot nitrogen to vaporize the dry ice and discharge it into the atmosphere with the nitrogen. The carbon dioxide in the tank will be completely wasted, and the entire process requires the use of nitrogen. The nitrogen consumption is huge, and it takes a lot of time and nitrogen, which is extremely inefficient. The second method is to gradually melt the dry ice by introducing carbon dioxide gas into the storage tank through a tank truck. This method requires contacting the tank truck and professional technicians to operate, otherwise it is easy to cause the tank truck to freeze. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art. The present application provides a deicing device to solve the technical problems of using direct blowing of hot nitrogen or introducing carbon dioxide gas into the storage tank through a tank truck to remove dry ice in the prior art, which leads to serious waste, extremely low efficiency, complicated operation and secondary freezing.

[0005] The present invention provides the following technical solutions:

[0006] A deicing device, comprising:

[0007] Base;

[0008] A device group is arranged on the base, and the device group includes a vaporizer and a pipeline heater;

[0009] A pipeline group, the pipeline group includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the vaporizer is connected to the first pipeline and the second pipeline respectively, the pipeline heater is connected to the second pipeline and the third pipeline respectively, the fourth pipeline is connected to the second pipeline and the third pipeline respectively, one end of the first pipeline away from the vaporizer is used to be connected to the gas phase port of the nitrogen cylinder, the carbon dioxide cylinder and the storage tank respectively, and one end of the third pipeline away from the pipeline heater is used to be connected to the liquid phase port of the storage tank;

[0010] A valve group is arranged on the pipeline group, the valve group includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve and an eighth valve, the first pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline, the first branch pipeline is respectively connected to the main pipeline and the nitrogen cylinder, the second branch pipeline is respectively connected to the main pipeline and the carbon dioxide cylinder, the main pipeline is respectively connected to the vaporizer and the gas phase port of the storage tank, the first valve is arranged on the first branch pipeline, the second valve is arranged on the second branch pipeline, the eighth valve is arranged on the main pipeline and is located between the second branch pipeline and the gas phase port of the storage tank, the third valve is arranged on the second pipeline, the fourth valve is arranged on the third pipeline, and the third valve and the fourth valve are both located between the two ends of the fourth pipeline, the fifth valve is arranged on the fourth pipeline, the sixth valve is located between one end of the fourth pipeline close to the third pipeline and the liquid phase port of the storage tank, and the seventh valve is located between the eighth valve and the gas phase port of the storage tank.

[0011] In some embodiments of the present application, the deicing device is further provided with a first hose and a second hose, respectively, the first branch pipe is connected to the nitrogen cylinder through the first hose, and the second branch pipe is connected to the carbon dioxide cylinder through the second hose.

[0012] In some embodiments of the present application, the deicing device is also provided with a third hose and a fourth hose, respectively, the main pipe is connected to the gas phase port of the storage tank through the third hose, and the third pipeline is connected to the liquid phase port of the storage tank through the fourth hose.

[0013] In some embodiments of the present application, the valve group further includes a pressure regulating valve and a safety valve, the pressure regulating valve is arranged on the fourth pipeline, and the safety valve is arranged on the third pipeline and / or the fourth pipeline.

[0014] In some embodiments of the present application, a plurality of casters are disposed at the bottom of the base, and the plurality of casters are spaced apart along the circumference of the base.

[0015] In some embodiments of the present application, the deicing device is further provided with a pressure gauge, and the pressure gauge is located between an end of the fourth pipeline close to the third pipeline and the liquid phase port of the storage tank.

[0016] In some embodiments of the present application, the deicing device is further provided with a control box, which is arranged on the base and is electrically connected to the pipe heater and the vaporizer respectively.

[0017] The present application also provides a deicing method for the deicing device as described above, the deicing method comprising the steps of:

[0018] S1: Connect the first branch pipe to the nitrogen cylinder, the second branch pipe to the carbon dioxide cylinder, the third pipe to the liquid phase port of the storage tank, and the main pipe to the gas phase port of the storage tank;

[0019] S2: Open the first valve, the third valve, the fourth valve and the seventh valve, close the remaining valve groups, and observe whether there is gas discharge from the seventh valve; if there is gas discharge from the seventh valve, it proves that the liquid phase port of the storage tank is connected to the gas phase port of the storage tank, and then proceed to step S4; if there is no gas discharge from the seventh valve, it proves that the liquid phase port of the storage tank is blocked by dry ice, and then proceed to step S3;

[0020] S3: close the first valve, open the sixth valve to discharge the gas through the sixth valve, open the first valve after the gas is discharged, close the sixth valve, close the first valve after a preset time, open the sixth valve to discharge the gas through the sixth valve, repeat the cycle until the first valve is opened, the sixth valve is closed, and gas is discharged from the seventh valve;

[0021] S4: closing the seventh valve to introduce nitrogen into the storage tank, and closing the first valve after the pressure in the storage tank reaches a first preset value;

[0022] S5: Open the second valve and the seventh valve to introduce carbon dioxide gas into the storage tank, gradually replace the nitrogen in the storage tank, and then close the seventh valve. After the pressure in the storage tank reaches a second preset value, close the second valve, the third valve, and the fourth valve;

[0023] S6: Open the fifth valve and the eighth valve to observe whether there is frost at the liquid phase port of the storage tank; if there is frost at the liquid phase port of the storage tank, it proves that carbon dioxide liquid formed by melting dry ice flows out of the liquid phase port of the storage tank, and the carbon dioxide liquid flows out and is vaporized by the vaporizer to form carbon dioxide gas, which is passed into the gas phase port of the storage tank through the main pipe until there is no frost at the liquid phase port of the storage tank, which proves that the dry ice in the storage tank has been completely melted;

[0024] S7: Close the fifth valve and open the second valve to introduce carbon dioxide gas into the storage tank through the gas phase port of the storage tank. After the pressure in the storage tank reaches the third preset value, close the second valve, disconnect the first branch pipe from the nitrogen cylinder, disconnect the second branch pipe from the carbon dioxide cylinder, disconnect the third pipeline from the liquid phase port of the storage tank, and disconnect the main pipe from the gas phase port of the storage tank to complete the deicing work.

[0025] In some embodiments of the present application, in step S6, a pressure regulating valve is provided between the fifth valve and the liquid phase port of the storage tank, and the pressure regulating valve is adjusted to maintain the pressure in the storage tank at a fourth preset value, wherein the fourth preset value is not greater than the third preset value.

[0026] In some embodiments of the present application, in step S7, the pressure in the storage tank is maintained after reaching a third preset value, the air tightness of the storage tank is checked, the second valve is closed after meeting the preset requirements, and the seventh valve is opened to release the pressure, the pressure in the storage tank reaches a fifth preset value, the seventh valve is closed, the first branch pipe is disconnected from the nitrogen cylinder, the second branch pipe is disconnected from the carbon dioxide cylinder, the third pipeline is disconnected from the liquid phase port of the storage tank, and the main pipe is disconnected from the gas phase port of the storage tank to complete the deicing work.

[0027] The embodiments of the present invention have the following advantages:

[0028] The present application proposes a de-icing device, which comprises a vaporizer and a pipe heater arranged on a base, wherein the vaporizer and the pipe heater are connected via a pipe group, and a valve group is arranged on the pipe group. The function of removing dry ice in a storage tank is achieved by switching the valve group. The vaporizer, the pipe heater, the pipe group and the valve group are integrated on the base, which is simple and convenient to operate and easy to transport and move.

[0029] During operation, first connect the deicing device to the nitrogen cylinder, carbon dioxide cylinder, liquid phase port of the storage tank and gas phase port of the storage tank respectively. Then open the first valve, the third valve, the fourth valve and the seventh valve, and close the remaining valve groups to pass nitrogen through the nitrogen cylinder to the liquid phase port of the storage tank. At this time, observe whether there is gas discharge from the seventh valve. If there is gas discharge from the seventh valve, it proves that the liquid phase port of the storage tank is connected to the gas phase port of the storage tank, and no unblocking treatment is required; if there is no gas discharge from the seventh valve, it proves that the liquid phase port of the storage tank is blocked by dry ice and needs to be unblocked.

[0030] When no gas is discharged from the seventh valve, close the first valve and open the sixth valve to discharge the nitrogen in the pipeline group and the storage tank through the sixth valve. After the nitrogen is discharged, open the first valve and close the sixth valve, so that the nitrogen from the nitrogen bottle is heated to room temperature by the vaporizer, heated by the pipeline heater, and then passed into the storage tank to exchange heat with dry ice to melt the dry ice to achieve the effect of clearing the liquid phase port of the storage tank. After a preset time interval, close the first valve and open the sixth valve to discharge the nitrogen after heat exchange through the sixth valve. Repeat the cycle until gas is discharged from the seventh valve after opening the first valve and closing the sixth valve, which proves that the liquid phase port of the storage tank is connected to the gas phase port of the storage tank.

[0031] When gas is discharged from the seventh valve, the seventh valve is closed to continue to introduce hot nitrogen into the storage tank. After the pressure in the storage tank reaches the first preset value, the first valve is closed, so that heat can be further exchanged with the dry ice in the storage tank, and after the pressure in the storage tank reaches the first preset value, the carbon dioxide liquid can be prevented from being converted into dry ice. After the hot nitrogen has exchanged heat with the dry ice, the second valve and the seventh valve are opened to introduce heated carbon dioxide gas into the storage tank, and the nitrogen in the storage tank that has been heat exchanged is gradually discharged through the seventh valve and replaced with hot carbon dioxide gas. After the replacement is completed, the seventh valve is closed, and the heated carbon dioxide gas continues to be introduced into the storage tank for heat exchange with dry ice. After the pressure in the storage tank reaches the second preset value, the second valve, the third valve and the fourth valve are closed.

[0032] Then open the fifth valve and the eighth valve, and observe whether there is frost at the liquid phase port of the storage tank. If there is frost at the liquid phase port of the storage tank, it proves that carbon dioxide liquid formed by the melting of dry ice is flowing out of the liquid phase port of the storage tank. The carbon dioxide liquid flows out and is vaporized by the vaporizer to form carbon dioxide gas, which is passed into the gas phase port of the storage tank through the main pipe until there is no frost at the liquid phase port of the storage tank, which proves that the dry ice in the storage tank has been completely melted.

[0033] After the dry ice is completely melted, the fifth valve is closed, and the second valve is opened to introduce carbon dioxide gas into the storage tank through the gas phase port of the storage tank. After the pressure in the storage tank reaches the third preset value, the second valve is closed. Finally, the deicing device is disconnected from the nitrogen cylinder, the carbon dioxide cylinder, the liquid phase port of the storage tank, and the gas phase port of the storage tank, respectively, to complete the deicing work.

[0034] By setting up a vaporizer, the nitrogen and carbon dioxide gases coming out of the nitrogen cylinder and the carbon dioxide cylinder can be restored to normal temperature, and the carbon dioxide liquid flowing out of the liquid phase port of the storage tank can be vaporized (heat exchanged with the external environment) to form carbon dioxide gas, which is passed into the gas phase port of the storage tank through the main pipe. The carbon dioxide gas enters the storage tank and exchanges heat with dry ice, so that the storage tank and the external environment form a circulating heat exchange, which can effectively save electricity and reduce costs. By setting up a pipeline heater, the nitrogen or carbon dioxide gas that has been restored to normal temperature through the vaporizer can be heated, so that the nitrogen or carbon dioxide gas is heated and then passed into the storage tank to exchange heat with dry ice, and then heated by the pipeline heater after returning to normal temperature through the vaporizer, which can effectively save electricity. The deicing device is simple to operate. By switching the valve group, only a small amount of nitrogen is needed to clear the liquid phase port and the gas phase port of the storage tank. After clearing, only a small amount of carbon dioxide gas needs to be passed into the storage tank to complete the deicing of the storage tank, which effectively reduces the waste of nitrogen and carbon dioxide gas, improves the deicing efficiency, and has no risk of secondary icing. The method avoids the technical problems of removing dry ice by direct blowing with hot nitrogen or introducing carbon dioxide gas into the storage tank through a tank truck in the prior art, which leads to serious waste, extremely low efficiency, complicated operation and secondary freezing.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A perspective schematic diagram of a deicing device in some embodiments of the present application is shown;

[0038] Figure 2 Another perspective perspective schematic diagram of a deicing device in some embodiments of the present application is shown;

[0039] Figure 3 It shows the pipeline instrument flow chart of the deicing device in some embodiments of the present application;

[0040] Figure 4 A flow chart of a deicing method for a deicing device in some embodiments of the present application is shown.

[0041] Description of main component symbols:

[0042] 100-deicing device; 10-base; 20-device group; 201-vaporizer; 202-pipe heater; 30-pipe group; 301-first pipeline; 3011-main pipeline; 3012-first branch pipeline; 3013-second branch pipeline; 302-second pipeline; 303-third pipeline; 304-fourth pipeline; 40-valve group; 41-pressure regulating valve; 42-safety valve; 401-first valve; 402-second valve; 403-third valve; 404-fourth valve; 405-fifth valve; 406-sixth valve; 407-seventh valve; 408-eighth valve; 50-first hose; 51-second hose; 52-third hose; 53-fourth hose; 54-castors; 55-pressure gauge; 56-control box; 60-nitrogen cylinder; 70-carbon dioxide cylinder; 80-storage tank. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0048] like Figure 1 and Figure 2 As shown, the embodiment of the present application provides a deicing device 100, which is mainly used to remove dry ice in a storage tank 80. The deicing device 100 includes a base 10, a device group 20, a pipeline group 30 and a valve group 40.

[0049] The device group 20 is arranged on the base 10, and the device group 20 includes a vaporizer 201 and a pipe heater 202. The pipe group 30 includes a first pipe 301, a second pipe 302, a third pipe 303 and a fourth pipe 304. The vaporizer 201 is connected to the first pipe 301 and the second pipe 302 respectively, the pipe heater 202 is connected to the second pipe 302 and the third pipe 303 respectively, the fourth pipe 304 is connected to the second pipe 302 and the third pipe 303 respectively, the end of the first pipe 301 away from the vaporizer 201 is used to be connected to the gas phase port of the nitrogen cylinder 60, the carbon dioxide cylinder 70 and the storage tank 80 respectively, and the end of the third pipe 303 away from the pipe heater 202 is used to be connected to the liquid phase port of the storage tank 80.

[0050] See also Figure 3The valve group 40 is arranged on the pipeline group 30, and the valve group 40 includes a first valve 401, a second valve 402, a third valve 403, a fourth valve 404, a fifth valve 405, a sixth valve 406, a seventh valve 407 and an eighth valve 408. The first pipeline 301 includes a main pipe 3011, a first branch pipe 3012 and a second branch pipe 3013. The first branch pipe 3012 is connected to the main pipe 3011 and the nitrogen bottle 60 respectively, and the second branch pipe 3013 is connected to the main pipe 3011 and the carbon dioxide bottle 70 respectively. The main pipe 3011 is connected to the gas phase port of the vaporizer 201 and the storage tank 80 respectively. The first valve 401 is arranged on the first branch pipe 30 12, the second valve 402 is arranged on the second branch pipe 3013, the eighth valve 408 is arranged on the main pipe 3011 and is located between the second branch pipe 3013 and the gas phase port of the storage tank 80, the third valve 403 is arranged on the second pipeline 302, the fourth valve 404 is arranged on the third pipeline 303, and the third valve 403 and the fourth valve 404 are both located between the two ends of the fourth pipeline 304, the fifth valve 405 is arranged on the fourth pipeline 304, the sixth valve 406 is located between one end of the fourth pipeline 304 close to the third pipeline 303 and the liquid phase port of the storage tank 80, and the seventh valve 407 is located between the eighth valve 408 and the gas phase port of the storage tank 80.

[0051] The deicing device 100 provided in the embodiment of the present application is provided with a vaporizer 201 and a pipe heater 202 on a base 10, the vaporizer 201 and the pipe heater 202 are connected by a pipe group 30, and a valve group 40 is provided on the pipe group 30, and the function of removing dry ice in the storage tank 80 is realized by switching the valve group 40. The vaporizer 201, the pipe heater 202, the pipe group 30 and the valve group 40 are integrated on the base 10, which is simple and convenient to operate and easy to transport and move.

[0052] During operation, the deicing device 100 is first connected to the nitrogen bottle 60, the carbon dioxide bottle 70, the liquid phase port of the storage tank 80 and the gas phase port of the storage tank 80. Then the first valve 401, the third valve 403, the fourth valve 404 and the seventh valve 407 are opened, and the remaining valve groups 40 are closed to pass nitrogen through the nitrogen bottle 60 to the liquid phase port of the storage tank 80. At this time, observe whether there is gas discharge at the seventh valve 407. If there is gas discharge at the seventh valve 407, it proves that the liquid phase port of the storage tank 80 is connected to the gas phase port of the storage tank 80, and no unblocking treatment is required; if there is no gas discharge at the seventh valve 407, it proves that the liquid phase port of the storage tank 80 is blocked by dry ice and needs to be unblocked.

[0053] When no gas is discharged from the seventh valve 407, the first valve 401 is closed and the sixth valve 406 is opened to discharge the nitrogen in the pipeline group 30 and the storage tank 80 through the sixth valve 406. After the nitrogen is discharged, the first valve 401 is opened and the sixth valve 406 is closed, so that the nitrogen from the nitrogen bottle 60 is successively raised to room temperature by the vaporizer 201 and heated by the pipeline heater 202, and then passed into the storage tank 80 to exchange heat with the dry ice, so as to melt the dry ice to achieve the effect of clearing the liquid phase port of the storage tank 80. After a preset time interval, the first valve 401 is closed and the sixth valve 406 is opened to discharge the nitrogen after heat exchange through the sixth valve 406. The cycle operation is repeated until gas is discharged from the seventh valve 407 after the first valve 401 is opened and the sixth valve 406 is closed, which proves that the liquid phase port of the storage tank 80 is connected with the gas phase port of the storage tank 80.

[0054] When gas is discharged from the seventh valve 407, the seventh valve 407 is closed to continue to introduce hot nitrogen into the storage tank 80. After the pressure in the storage tank 80 reaches the first preset value, the first valve 401 is closed, so that heat can be further exchanged with the dry ice in the storage tank 80, and after the pressure in the storage tank 80 reaches the first preset value, the carbon dioxide liquid can be prevented from being converted into dry ice. After the hot nitrogen has exchanged heat with the dry ice, the second valve 402 and the seventh valve 407 are opened to introduce heated carbon dioxide gas into the storage tank 80, and the nitrogen in the storage tank 80 that has exchanged heat is gradually discharged through the seventh valve 407 and replaced with hot carbon dioxide gas. After the replacement is completed, the seventh valve 407 is closed, and the heated carbon dioxide gas continues to be introduced into the storage tank 80 to exchange heat with the dry ice. After the pressure in the storage tank 80 reaches the second preset value, the second valve 402, the third valve 403 and the fourth valve 404 are closed.

[0055] Then open the fifth valve 405 and the eighth valve 408 to observe whether there is frost at the liquid phase port of the storage tank 80. If there is frost at the liquid phase port of the storage tank 80, it proves that carbon dioxide liquid formed by melting dry ice flows out of the liquid phase port of the storage tank 80. The carbon dioxide liquid flows out and is vaporized by the vaporizer 201 to form carbon dioxide gas, which is then passed into the gas phase port of the storage tank 80 through the main pipe 3011 until there is no frost at the liquid phase port of the storage tank 80, which proves that the dry ice in the storage tank 80 has been completely melted.

[0056] After the dry ice is completely melted, the fifth valve 405 is closed, and the second valve 402 is opened to introduce carbon dioxide gas into the storage tank 80 through the gas phase port of the storage tank 80. After the pressure in the storage tank 80 reaches the third preset value, the second valve 402 is closed. Finally, the deicing device 100 is disconnected from the nitrogen cylinder 60, the carbon dioxide cylinder 70, the liquid phase port of the storage tank 80, and the gas phase port of the storage tank 80, respectively, to complete the deicing work.

[0057] By setting up the vaporizer 201, the nitrogen and carbon dioxide gases coming out of the nitrogen cylinder 60 and the carbon dioxide cylinder 70 can be restored to normal temperature, and the carbon dioxide liquid flowing out of the liquid phase port of the storage tank 80 can be vaporized (heat exchanged with the external environment) to form carbon dioxide gas, which is passed into the gas phase port of the storage tank 80 through the main pipe 3011. The carbon dioxide gas enters the storage tank 80 and exchanges heat with dry ice, so that the storage tank 80 and the external environment form a cyclic heat exchange, which can effectively save electricity and reduce costs. By setting up the pipeline heater 202, the nitrogen or carbon dioxide gas that has been restored to normal temperature through the vaporizer 201 can be heated, so that the nitrogen or carbon dioxide gas is heated and then passed into the storage tank 80 to exchange heat with dry ice, and then heated by the pipeline heater 202 after returning to normal temperature through the vaporizer 201, which can effectively save electricity. The deicing device 100 is easy to operate. By switching the valve group 40, only a small amount of nitrogen is needed to clear the liquid phase port and the gas phase port of the storage tank 80. After clearing, only a small amount of carbon dioxide gas needs to be introduced into the storage tank 80 to complete the deicing of the storage tank 80. The carbon dioxide in the storage tank 80 will not be wasted, and the heat in the environment is fully utilized, which greatly saves gas. The overall cost is extremely low, and the waste of nitrogen and carbon dioxide gas is effectively reduced, the deicing efficiency is improved, and there is no risk of secondary icing. The method of using hot nitrogen to directly blow or introducing carbon dioxide gas into the storage tank through a tank truck to remove dry ice in the prior art is avoided, which leads to serious waste, extremely low efficiency, complicated operation and secondary icing.

[0058] It should be noted that when the pressure is lower than 0.7Mpa, liquid carbon dioxide begins to convert to solid carbon dioxide (dry ice). This characteristic determines that the storage pressure of liquid carbon dioxide cannot be lower than 0.7Mpa. Exemplarily, the first preset value of the pressure in the storage tank 80 can be set to 0.8Mpa to prevent the conversion of carbon dioxide liquid to dry ice. In the process of using carbon dioxide gas to replace hot nitrogen, the pressure in the storage tank 80 is always not less than 0.8Mpa to prevent the conversion of carbon dioxide liquid to dry ice. The first valve 401, the second valve 402, the third valve 403, the fourth valve 404, the fifth valve 405, the sixth valve 406, the seventh valve 407 and the eighth valve 408 can all be manual regulating valves, which are simple and convenient to operate. Among them, the first valve 401, the second valve 402, the third valve 403, the fourth valve 404, the fifth valve 405 and the eighth valve 408 can all be ball valves, and the sixth valve 406 and the seventh valve 407 can be low-temperature stop valves. The pipelines can be connected to each other through three-way connectors, and the pipelines can be connected to the device group 20, the nitrogen cylinder 60, the carbon dioxide cylinder 70 and the storage tank 80 through flanges. The base 10 can be composed of a square tube and a mounting pad.

[0059] like Figure 3As shown, in one embodiment of the present application, optionally, the de-icing device 100 is further provided with a first hose 50 and a second hose 51, respectively, the first branch pipe 3012 is connected to the nitrogen cylinder 60 through the first hose 50, and the second branch pipe 3013 is connected to the carbon dioxide cylinder 70 through the second hose 51.

[0060] In this embodiment, the first branch pipe 3012 is connected to the nitrogen cylinder 60 through the first hose 50, so as to realize the function of sealing connection between the nitrogen cylinder 60 and the first branch pipe 3012, and to facilitate adjustment of the placement position of the nitrogen cylinder 60. The second branch pipe 3013 is connected to the carbon dioxide cylinder 70 through the second hose 51, so as to realize the function of sealing connection between the carbon dioxide cylinder 70 and the second branch pipe 3013, and to facilitate adjustment of the placement position of the carbon dioxide cylinder 70.

[0061] like Figure 3 As shown, in one embodiment of the present application, optionally, the de-icing device 100 is also provided with a third hose 52 and a fourth hose 53, respectively, the main pipe 3011 is connected to the gas phase port of the storage tank 80 through the third hose 52, and the third pipeline 303 is connected to the liquid phase port of the storage tank 80 through the fourth hose 53.

[0062] In this embodiment, the main pipe 3011 is connected to the gas phase port of the storage tank 80 through the third hose 52, so as to realize the function of sealing connection between the gas phase port of the storage tank 80 and the main pipe 3011, and facilitate the adjustment of the position of the deicing device 100 relative to the storage tank 80. The third pipe 303 is connected to the liquid phase port of the storage tank 80 through the fourth hose 53, so as to realize the function of sealing connection between the liquid phase port of the storage tank 80 and the third pipe 303, and facilitate the adjustment of the position of the deicing device 100 relative to the storage tank 80.

[0063] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment of the present application, optionally, the valve group 40 also includes a pressure regulating valve 41 and a safety valve 42 , the pressure regulating valve 41 is arranged on the fourth pipeline 304 , and the safety valve 42 is arranged on the third pipeline 303 and / or the fourth pipeline 304 .

[0064] In this embodiment, a pressure regulating valve 41 is provided on the fourth pipeline 304, so that the pressure regulating valve 41 is adjusted according to the third preset value of the storage tank 80 to maintain the pressure in the storage tank 80 at the fourth preset value, the third preset value is the design pressure of the storage tank 80, and the fourth preset value is the set pressure of the storage tank 80, and the set pressure is usually 0.5Mpa lower than the design pressure. A safety valve 42 is provided on the third pipeline 303 and / or the fourth pipeline 304 to improve safety, ensure the safety of deicing operation, and prevent safety accidents.

[0065] like Figure 1 and Figure 2As shown, in the above embodiment of the present application, optionally, a plurality of casters 54 are provided at the bottom of the base 10 , and the plurality of casters 54 are arranged at intervals along the circumference of the base 10 .

[0066] In this embodiment, a plurality of casters 54 are provided at intervals in the circumferential direction of the bottom of the base 10, so that the deicing device 100 can be moved and transported as a whole, and the movement is flexible and convenient, thereby improving the movement efficiency.

[0067] like Figure 2 and Figure 3 As shown, in one embodiment of the present application, optionally, the deicing device 100 is further provided with a pressure gauge 55 , and the pressure gauge 55 is located between one end of the fourth pipe 304 close to the third pipe 303 and the liquid phase port of the storage tank 80 .

[0068] In this embodiment, a pressure gauge 55 is provided between the end of the fourth pipe 304 close to the third pipe 303 and the liquid phase port of the storage tank 80 , so that the operator can know the pressure in the deicing device 100 and the storage tank 80 in real time.

[0069] like Figure 1 and Figure 2 As shown, in one embodiment of the present application, optionally, the deicing device 100 is further provided with a control box 56, which is disposed on the base 10 and is electrically connected to the pipe heater 202 and the vaporizer 201 respectively.

[0070] In this embodiment, a control box 56 is provided on the base 10 , and the control box 56 is electrically connected to the pipe heater 202 and the vaporizer 201 respectively, so as to realize the function of supplying power to the vaporizer 201 and the function of setting the heating temperature of the pipe heater 202 .

[0071] like Figure 1 , Figure 3 and Figure 4 As shown, the embodiment of the present application also provides a deicing method of the deicing device 100 as described in the above embodiment, and the deicing method comprises the steps of:

[0072] Step S1: connect the first branch pipe 3012 to the nitrogen cylinder 60 , connect the second branch pipe 3013 to the carbon dioxide cylinder 70 , connect the third pipeline 303 to the liquid phase port of the storage tank 80 , and connect the main pipe 3011 to the gas phase port of the storage tank 80 .

[0073] Specifically, by connecting the deicing device 100 to the liquid phase port of the nitrogen cylinder 60, the carbon dioxide cylinder 70, the storage tank 80 and the gas phase port of the storage tank 80, the deicing device 100 can be connected to the liquid phase port of the nitrogen cylinder 60, the carbon dioxide cylinder 70, the storage tank 80 and the gas phase port of the storage tank 80, respectively, so as to facilitate the subsequent deicing work. The first branch pipe 3012 can be sealed and connected to the nitrogen cylinder 60 through the flange and the first hose 50, the second branch pipe 3013 can be sealed and connected to the carbon dioxide cylinder 70 through the flange and the second hose 51, the third pipeline 303 can be sealed and connected to the liquid phase port of the storage tank 80 through the flange and the third hose 52, and the main pipe 3011 can be sealed and connected to the gas phase port of the storage tank 80 through the flange and the fourth hose 53.

[0074] Step S2: open the first valve 401, the third valve 403, the fourth valve 404 and the seventh valve 407, close the remaining valve groups 40, and observe whether there is gas discharge from the seventh valve 407; if there is gas discharge from the seventh valve 407, it proves that the liquid phase port of the storage tank 80 is connected to the gas phase port of the storage tank 80, and then proceed to step S4; if there is no gas discharge from the seventh valve 407, it proves that the liquid phase port of the storage tank 80 is blocked by dry ice, and then proceed to step S3.

[0075] Specifically, after the de-icing device 100 is respectively connected to the nitrogen bottle 60, the carbon dioxide bottle 70, the liquid phase port of the storage tank 80 and the gas phase port of the storage tank 80, the first valve 401, the third valve 403, the fourth valve 404 and the seventh valve 407 are opened, and the remaining valve groups 40 are closed to pass nitrogen into the liquid phase port of the storage tank 80 through the nitrogen bottle 60. At this time, observe whether there is gas discharge from the seventh valve 407. If gas is discharged from the seventh valve 407, it proves that the liquid phase port of the storage tank 80 is connected to the gas phase port of the storage tank 80, and no unblocking treatment is required, and the subsequent step S4 is performed; if no gas is discharged from the seventh valve 407, it proves that the liquid phase port of the storage tank 80 is blocked by dry ice and needs to be unblocked, and the subsequent step S3 is performed.

[0076] Exemplarily, the first valve 401, the third valve 403, the fourth valve 404 and the seventh valve 407 can all be manual regulating valves, which are easy and convenient to operate. Among them, the first valve 401, the third valve 403 and the fourth valve 404 can all be ball valves, and the seventh valve 407 can be a low-temperature stop valve.

[0077] Step S3: close the first valve 401, open the sixth valve 406 to discharge the gas through the sixth valve 406, open the first valve 401 after the gas is discharged, close the sixth valve 406, close the first valve 401 after a preset time, open the sixth valve 406 to discharge the gas through the sixth valve 406, repeat the cycle until the first valve 401 is opened, the sixth valve 406 is closed, and gas is discharged from the seventh valve 407.

[0078] Specifically, when no gas is discharged from the seventh valve 407, the first valve 401 is closed and the sixth valve 406 is opened to discharge the nitrogen in the pipeline group 30 and the storage tank 80 through the sixth valve 406. After the nitrogen is discharged, the first valve 401 is opened and the sixth valve 406 is closed, so that the nitrogen from the nitrogen bottle 60 is successively raised to room temperature by the vaporizer 201 and heated by the pipeline heater 202, and then passed into the storage tank 80 to exchange heat with the dry ice, so as to melt the dry ice to achieve the effect of clearing the liquid phase port of the storage tank 80. After a preset time interval, the first valve 401 is closed and the sixth valve 406 is opened to discharge the nitrogen after heat exchange through the sixth valve 406. The cycle operation is repeated until gas is discharged from the seventh valve 407 after the first valve 401 is opened and the sixth valve 406 is closed, which proves that the liquid phase port of the storage tank 80 is connected with the gas phase port of the storage tank 80.

[0079] For example, the sixth valve 406 may be a manual regulating valve, which is easy and convenient to operate, and may be a low-temperature stop valve. The preset time may be five minutes.

[0080] Step S4: close the seventh valve 407 to introduce nitrogen into the storage tank 80, and close the first valve 401 after the pressure in the storage tank 80 reaches a first preset value.

[0081] Specifically, when gas is discharged from the seventh valve 407, the seventh valve 407 is closed to continue to introduce hot nitrogen into the storage tank 80. After the pressure in the storage tank 80 reaches the first preset value, the first valve 401 is closed, so that heat can be further exchanged with the dry ice in the storage tank 80. After the pressure in the storage tank 80 reaches the first preset value, the carbon dioxide liquid can be prevented from being converted into dry ice.

[0082] Exemplarily, the first preset value of the pressure in the storage tank 80 may be set to 0.8 MPa to prevent the carbon dioxide liquid from being converted into dry ice.

[0083] Step S5: Open the second valve 402 and the seventh valve 407 to introduce carbon dioxide gas into the storage tank 80, gradually replace the nitrogen in the storage tank 80, and then close the seventh valve 407. After the pressure in the storage tank 80 reaches a second preset value, close the second valve 402, the third valve 403 and the fourth valve 404.

[0084] Specifically, after the hot nitrogen and dry ice have exchanged heat, the second valve 402 and the seventh valve 407 are opened to introduce the heated carbon dioxide gas into the storage tank 80, and the nitrogen in the storage tank 80 that has exchanged heat is gradually discharged through the seventh valve 407 and replaced with hot carbon dioxide gas. After the replacement is completed, the seventh valve 407 is closed, and the heated carbon dioxide gas continues to be introduced into the storage tank 80 for heat exchange with dry ice. After the pressure in the storage tank 80 reaches the second preset value, the second valve 402, the third valve 403 and the fourth valve 404 are closed.

[0085] It should be noted that during the process of replacing hot nitrogen with carbon dioxide gas, the pressure in the storage tank 80 is always not less than 0.8 MPa to prevent the carbon dioxide liquid from being converted into dry ice.

[0086] Exemplarily, the second valve 402 may be a manual regulating valve, specifically a ball valve, and after approximately four bottles of carbon dioxide (20 kg / bottle) of gas are introduced, the second valve 402, the third valve 403 and the fourth valve 404 are closed.

[0087] Step S6: Open the fifth valve 405 and the eighth valve 408, and observe whether there is frost at the liquid phase port of the storage tank 80; if there is frost at the liquid phase port of the storage tank 80, it proves that carbon dioxide liquid formed by melting dry ice flows out of the liquid phase port of the storage tank 80, and the carbon dioxide liquid flows out and is vaporized by the vaporizer 201 to form carbon dioxide gas, which is then passed into the gas phase port of the storage tank 80 through the main pipe 3011 until there is no frost at the liquid phase port of the storage tank 80, which proves that the dry ice in the storage tank 80 has been completely melted.

[0088] Specifically, open the fifth valve 405 and the eighth valve 408, and observe whether there is frost at the liquid phase port of the storage tank 80. If there is frost at the liquid phase port of the storage tank 80, it proves that carbon dioxide liquid formed by the melting of dry ice flows out of the liquid phase port of the storage tank 80. The carbon dioxide liquid flows out and is vaporized by the vaporizer 201 to form carbon dioxide gas, which is then passed into the gas phase port of the storage tank 80 through the main pipe 3011, continuously providing heat for the melting of the dry ice in the storage tank 80, until there is no frost at the liquid phase port of the storage tank 80, which proves that the dry ice in the storage tank 80 has been completely melted.

[0089] Exemplarily, the fifth valve 405 and the eighth valve 408 may both be manual regulating valves, and the manual regulating valves may specifically be ball valves, which are simple and convenient to operate.

[0090] Step S7: Close the fifth valve 405, open the second valve 402, and introduce carbon dioxide gas into the storage tank 80 through the gas phase port of the storage tank 80. After the pressure in the storage tank 80 reaches the third preset value, close the second valve 402, disconnect the first branch pipe 3012 from the nitrogen cylinder 60, disconnect the second branch pipe 3013 from the carbon dioxide cylinder 70, disconnect the third pipeline 303 from the liquid phase port of the storage tank 80, and disconnect the main pipe 3011 from the gas phase port of the storage tank 80 to complete the deicing work.

[0091] Specifically, after the dry ice is completely melted, the fifth valve 405 is closed, and the second valve 402 is opened to introduce carbon dioxide gas into the storage tank 80 through the gas phase port of the storage tank 80. After the pressure in the storage tank 80 reaches the third preset value, the second valve 402 is closed. Finally, the deicing device 100 is disconnected from the nitrogen cylinder 60, the carbon dioxide cylinder 70, the liquid phase port of the storage tank 80, and the gas phase port of the storage tank 80, respectively, to complete the deicing work.

[0092] Exemplarily, the third preset value may be the design pressure of the storage tank 80 .

[0093] like Figure 2 , Figure 3 and Figure 4 As shown, in one embodiment of the present application, optionally, in step S6, a pressure regulating valve 41 is set between the fifth valve 405 and the liquid phase port of the storage tank 80, and the pressure regulating valve 41 is adjusted to maintain the pressure in the storage tank 80 at a fourth preset value, wherein the fourth preset value is not greater than the third preset value.

[0094] Specifically, a pressure regulating valve 41 is provided between the fifth valve 405 and the liquid phase port of the storage tank 80, so that the pressure in the storage tank 80 is maintained at a fourth preset value by adjusting the pressure regulating valve 41, and the fourth preset value is not greater than the third preset value. The fourth preset value may be a set pressure of the storage tank 80, and the third preset value is a design pressure of the storage tank 80, and the set pressure is usually 0.5 MPa lower than the design pressure.

[0095] like Figure 1 , Figure 3 and Figure 4 As shown, in one embodiment of the present application, optionally, in step S7, the pressure in the storage tank 80 is maintained after reaching a third preset value, the air tightness of the storage tank 80 is checked, and the second valve 402 is closed after meeting the preset requirements, and the seventh valve 407 is opened to release the pressure, and the pressure in the storage tank 80 reaches a fifth preset value and the seventh valve 407 is closed, the first branch pipe 3012 is disconnected from the nitrogen cylinder 60, the second branch pipe 3013 is disconnected from the carbon dioxide cylinder 70, the third pipeline 303 is disconnected from the liquid phase port of the storage tank 80, and the main pipe 3011 is disconnected from the gas phase port of the storage tank 80, thereby completing the deicing work.

[0096] Specifically, the deicing device 100 can be used as a pressure test tool to perform a pressure test on the deiced storage tank 80 to check the strength and air tightness.

[0097] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0098] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0099] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A deicing device, characterized in that: include: Base; A device group is arranged on the base, and the device group includes a vaporizer and a pipeline heater; A pipeline group, the pipeline group includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the vaporizer is connected to the first pipeline and the second pipeline respectively, the pipeline heater is connected to the second pipeline and the third pipeline respectively, the fourth pipeline is connected to the second pipeline and the third pipeline respectively, one end of the first pipeline away from the vaporizer is used to be connected to the gas phase port of the nitrogen cylinder, the carbon dioxide cylinder and the storage tank respectively, and one end of the third pipeline away from the pipeline heater is used to be connected to the liquid phase port of the storage tank; A valve group is arranged on the pipeline group, the valve group includes a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve and an eighth valve, the first pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline, the first branch pipeline is respectively connected to the main pipeline and the nitrogen cylinder, the second branch pipeline is respectively connected to the main pipeline and the carbon dioxide cylinder, the main pipeline is respectively connected to the vaporizer and the gas phase port of the storage tank, the first valve is arranged on the first branch pipeline, the second valve is arranged on the second branch pipeline, the eighth valve is arranged on the main pipeline and is located between the second branch pipeline and the gas phase port of the storage tank, the third valve is arranged on the second pipeline, the fourth valve is arranged on the third pipeline, and the third valve and the fourth valve are both located between the two ends of the fourth pipeline, the fifth valve is arranged on the fourth pipeline, the sixth valve is located between one end of the fourth pipeline close to the third pipeline and the liquid phase port of the storage tank, and the seventh valve is located between the eighth valve and the gas phase port of the storage tank.

2. The deicing device according to claim 1, characterized in that: The deicing device is also provided with a first hose and a second hose, respectively. The first branch pipe is connected to the nitrogen cylinder via the first hose, and the second branch pipe is connected to the carbon dioxide cylinder via the second hose.

3. The deicing device according to claim 1, characterized in that: The deicing device is also provided with a third hose and a fourth hose, respectively. The main pipe is connected to the gas phase port of the storage tank through the third hose, and the third pipeline is connected to the liquid phase port of the storage tank through the fourth hose.

4. The deicing device according to claim 1, characterized in that: The valve group further includes a pressure regulating valve and a safety valve. The pressure regulating valve is arranged on the fourth pipeline, and the safety valve is arranged on the third pipeline and / or the fourth pipeline.

5. The deicing device according to claim 1, characterized in that: A plurality of casters are arranged at the bottom of the base, and the plurality of casters are arranged at intervals along the circumference of the base.

6. The deicing device according to claim 1, characterized in that: The deicing device is also provided with a pressure gauge, and the pressure gauge is located between an end of the fourth pipeline close to the third pipeline and the liquid phase port of the storage tank.

7. The deicing device according to claim 1, characterized in that: The deicing device is also provided with a control box, which is arranged on the base and is electrically connected to the pipeline heater and the vaporizer respectively.

8. A deicing method for a deicing device according to any one of claims 1 to 7, characterized in that: The deicing method comprises the steps of: S1: Connect the first branch pipe to the nitrogen cylinder, the second branch pipe to the carbon dioxide cylinder, the third pipe to the liquid phase port of the storage tank, and the main pipe to the gas phase port of the storage tank; S2: Open the first valve, the third valve, the fourth valve and the seventh valve, close the remaining valve groups, and observe whether there is gas discharge from the seventh valve; if there is gas discharge from the seventh valve, it proves that the liquid phase port of the storage tank is connected to the gas phase port of the storage tank, and then proceed to step S4; if there is no gas discharge from the seventh valve, it proves that the liquid phase port of the storage tank is blocked by dry ice, and then proceed to step S3; S3: close the first valve, open the sixth valve to discharge the gas through the sixth valve, open the first valve after the gas is discharged, close the sixth valve, close the first valve after a preset time, open the sixth valve to discharge the gas through the sixth valve, repeat the cycle until the first valve is opened, the sixth valve is closed, and gas is discharged from the seventh valve; S4: closing the seventh valve to introduce nitrogen into the storage tank, and closing the first valve after the pressure in the storage tank reaches a first preset value; S5: Open the second valve and the seventh valve to introduce carbon dioxide gas into the storage tank, gradually replace the nitrogen in the storage tank, and then close the seventh valve. After the pressure in the storage tank reaches a second preset value, close the second valve, the third valve, and the fourth valve; S6: Open the fifth valve and the eighth valve to observe whether there is frost at the liquid phase port of the storage tank; if there is frost at the liquid phase port of the storage tank, it proves that carbon dioxide liquid formed by melting dry ice flows out of the liquid phase port of the storage tank, and the carbon dioxide liquid flows out and is vaporized by the vaporizer to form carbon dioxide gas, which is passed into the gas phase port of the storage tank through the main pipe until there is no frost at the liquid phase port of the storage tank, which proves that the dry ice in the storage tank has been completely melted; S7: Close the fifth valve and open the second valve to introduce carbon dioxide gas into the storage tank through the gas phase port of the storage tank. After the pressure in the storage tank reaches the third preset value, close the second valve, disconnect the first branch pipe from the nitrogen cylinder, disconnect the second branch pipe from the carbon dioxide cylinder, disconnect the third pipeline from the liquid phase port of the storage tank, and disconnect the main pipe from the gas phase port of the storage tank to complete the deicing work.

9. The deicing method of a deicing device according to claim 8, characterized in that: In step S6, a pressure regulating valve is provided between the fifth valve and the liquid phase port of the storage tank, and the pressure regulating valve is adjusted to maintain the pressure in the storage tank at a fourth preset value, wherein the fourth preset value is not greater than the third preset value.

10. The deicing method of a deicing device according to claim 8, characterized in that: In step S7, the pressure in the storage tank is maintained after reaching the third preset value, the air tightness of the storage tank is checked, and the second valve is closed after meeting the preset requirements, and the seventh valve is opened to release the pressure. After the pressure in the storage tank reaches the fifth preset value, the seventh valve is closed, the first branch pipe is disconnected from the nitrogen cylinder, the second branch pipe is disconnected from the carbon dioxide cylinder, the third pipeline is disconnected from the liquid phase port of the storage tank, and the main pipe is disconnected from the gas phase port of the storage tank to complete the deicing work.

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