Sealing structure of pressure gas pipeline system and pressure gas pipeline system

Abstract

The utility model provides a sealing structure of a pressure gas pipeline system and the pressure gas pipeline system.The sealing structure comprises a sealing shell; the sealing shell is arranged on the outer side of a to-be-sealed device of the pressure gas pipeline system in a sleeving mode, the to-be-sealed device is provided with at least one leakage risk position, and the to-be-sealed device is used for containing pressure gas; the sealing structure comprises a sealing piece, and the sealing shell is fixedly connected with a to-be-sealed device through the sealing piece. A sealing cavity is formed between the sealing shell and the to-be-sealed device, liquid for liquid sealing is arranged in the sealing cavity, the liquid for liquid sealing at least submerges at least one leakage risk position, and the liquid for liquid sealing is used for conducting liquid sealing on the working medium gas leakage position of the to-be-sealed device. The leakage risk position of the pressure pipeline is subjected to liquid sealing, so that leakage of the working medium gas in the pressure gas pipeline system is better avoided, the safety of the pressure gas pipeline system is better improved, and major safety accidents caused by leakage are better avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pressure pipelines, and in particular to a sealing structure of a pressure gas pipeline system and a pressure gas pipeline system. Background Art

[0002] At present, high-pressure working gas pipelines are used in various engineering scenarios. From the transportation of natural gas to the allocation of working gas in fuel cell systems, high-pressure working gas pipelines are one of the most important links in the design. Among them, pressure pipelines are generally defined as "tubular equipment used to transport working gas or liquid using a certain pressure, and its scope is specified as working gas with a maximum working pressure greater than or equal to 0.1MPa (gauge pressure), liquefied working gas, steam medium, or flammable, explosive, toxic, corrosive, and the maximum working temperature is higher than or equal to the marked boiling point of the liquid medium, and the nominal diameter is greater than 25mm". The danger of pressure pipeline leakage is enough to show.

[0003] For example, for hydrogen-related pipelines or systems, the sealing performance and leakage detection of the pipelines deserve more attention, because hydrogen itself is active, colorless and odorless and has a strong ability to escape. Once a large-scale leakage occurs, it may cause a major safety accident.

[0004] Generally speaking, leakage of working gas pipeline systems with a certain pressure is generally caused by structural defects or reduced sealing performance, and presents a certain development and change trend. In the initial stage, the leakage points are not large-scale, and will cause leakage as the risk points are further corroded or excessive local pressure differences are caused by unreasonable design. Especially for larger pipeline systems, the leakage of working gas is often random and unpredictable, and the potential safety risks are relatively large. Utility Model Content

[0005] In view of this, in order to solve the technical problem in the prior art that the pressure gas pipeline system is prone to cause leakage of working gas, the present disclosure provides a sealing structure and a pressure gas pipeline system.

[0006] According to a first aspect of an embodiment of the present disclosure, a sealing structure of a pressure gas pipeline system is provided.

[0007] The sealing structure comprises a sealing housing;

[0008] The sealing housing is sleeved on the outside of the device to be sealed of the pressure gas pipeline system, the device to be sealed has at least one leakage risk position, and the device to be sealed is used to contain pressure gas;

[0009] The sealing structure comprises a sealing member, and the sealing housing is fixedly connected to the device to be sealed via the sealing member;

[0010] A sealed cavity is formed between the sealed housing and the device to be sealed. A liquid-sealing liquid is provided in the sealed cavity. The liquid-sealing liquid at least submerges the at least one leakage risk position. The liquid-sealing liquid is used to liquid-seal the working gas leakage position of the device to be sealed.

[0011] In an optional embodiment, the liquid-sealing liquid includes a liquid that does not react with the working fluid gas in the pressure pipeline.

[0012] In an alternative embodiment,

[0013] The pressure pipe comprises a plurality of the devices to be sealed, the sealing housing comprises a common portion and a plurality of sealing portions, and the plurality of sealing portions correspond one to one to the plurality of the devices to be sealed;

[0014] In the sealing part and the device to be sealed corresponding to each other, the sealing part is sleeved on the radial outer side of the device to be sealed, and the sealing part is fixedly connected to the device to be sealed through the sealing member, and a first cavity is formed between the sealing part and the device to be sealed;

[0015] The common part is located at the top of the sealed housing, a second cavity is formed inside the common part, and the second cavity is communicated with the first cavity;

[0016] The sealed cavity includes the first cavity and the second cavity.

[0017] In an alternative embodiment,

[0018] The sealing structure comprises a first pressure detection device, the first pressure detection device is arranged on the top of the sealing shell, and there is a gap between the first pressure detection device and the liquid seal liquid, and the first pressure detection device is used to detect the internal pressure of the working fluid gas in the sealing cavity; and / or,

[0019] The sealing structure includes a second pressure detection device, which is arranged inside the liquid-sealing liquid and is used to detect the internal pressure of the liquid-sealing liquid.

[0020] In an alternative embodiment,

[0021] The sealing structure comprises a first pressure relief device, which is arranged at the top of the sealing shell, and there is a gap between the first pressure relief device and the liquid seal liquid, and the first pressure relief device is used to relieve pressure of the working gas in the sealing cavity; and / or,

[0022] The sealing structure includes a second pressure relief device, which is arranged inside the liquid-sealing liquid and is used to relieve pressure on the liquid-sealing liquid.

[0023] In an optional embodiment, the sealing structure includes a visual detection device, which is arranged inside the liquid-sealing liquid and is used to monitor the movement of bubbles inside the liquid-sealing liquid.

[0024] In an optional embodiment, the liquid-sealing liquid includes a liquid that reacts with the working fluid gas in the pressure pipeline.

[0025] In an optional embodiment, the sealing structure includes a concentration detection device, which is disposed inside the liquid-sealing liquid and is used to detect the concentration of a substance generated by a reaction between the liquid-sealing liquid and the leaked working fluid gas.

[0026] In an optional embodiment, the sealing structure includes a liquid replacement device, which is arranged at the bottom of the sealing shell and is used to replace the liquid sealing liquid.

[0027] According to a second aspect of an embodiment of the present disclosure, a pressure gas pipeline system is provided, characterized in that the pressure gas pipeline system comprises a device to be sealed for filling pressure gas, and a sealing structure as described in any one of the first aspects.

[0028] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the present disclosure may set a sealing shell on the outside of a device to be sealed having at least one leakage risk position in a pressure gas pipeline system, and use a sealing member to fix the sealing shell to the device to be sealed, thereby forming a sealed cavity between the sealing shell and the device to be sealed, and then fill the sealing cavity with a liquid (i.e., a liquid-sealing liquid) for liquid-sealing the working gas leakage position of the device to be sealed, thereby achieving liquid sealing of the leakage risk position of the pressure pipeline, thereby better avoiding leakage of the working gas in the pressure gas pipeline system, better improving the safety of the pressure gas pipeline system, and better avoiding major safety accidents caused by leakage.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0033] Figure 1 is a schematic diagram of a sealing structure of a pressure gas pipeline system according to an exemplary embodiment (a scenario in which no gas leakage occurs).

[0034] Figure 2 is a schematic diagram of a sealing structure of a pressure gas pipeline system according to another exemplary embodiment (a scenario in which gas leakage occurs).

[0035] Figure 3 is a schematic diagram of a sealing structure of a pressure gas pipeline system according to another exemplary embodiment.

[0036] Figure 4 is a schematic diagram of a sealing structure of a pressure gas pipeline system according to another exemplary embodiment.

[0037] Figure 5 is a schematic diagram of a sealing structure of a pressure gas pipeline system according to another exemplary embodiment.

[0038] Figure 6 is a schematic diagram of a sealing structure of a pressure gas pipeline system according to another exemplary embodiment.

[0039] Figure 7 is a schematic diagram of a sealing structure of a pressure gas pipeline system according to another exemplary embodiment. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0041] The disclosure below provides many different embodiments or examples for implementing different schemes of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0042] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0043] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0044] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0045] In order to solve the technical problem that the pressure gas pipeline in the prior art is prone to leakage of working gas, the present disclosure provides a sealing structure of a pressure gas pipeline system and a pressure gas pipeline system. Among them, the present disclosure can set a sealing shell on the outside of a device to be sealed having at least one leakage risk position in the pressure gas pipeline system, and use a sealing member to fix the sealing shell with the device to be sealed, so that a sealed cavity is formed between the sealing shell and the device to be sealed, and then fill the sealing cavity with a liquid (i.e., a liquid sealing liquid) for liquid-sealing the working gas leakage position of the device to be sealed, so as to achieve liquid sealing of the leakage risk position of the pressure pipeline, thereby better avoiding leakage of working gas in the pressure gas pipeline system, better improving the safety of the pressure gas pipeline system, and better avoiding major safety accidents caused by leakage.

[0046] In an exemplary embodiment, a sealing structure of a pressure gas pipeline system is provided. The pressure gas pipeline system in the present application may generally include a valve interface, a pressure pipeline, a pressure vessel, a reactor, a fuel cell stack, an electrolytic cell, etc. A pressure pipeline refers to a tubular device used to transport a working gas or liquid using a certain pressure, and its scope is defined as a working gas with a maximum working pressure greater than or equal to 0.1 MPa (gauge pressure), a liquefied working gas, a steam medium, or a flammable, explosive, toxic, corrosive liquid medium with a maximum working temperature greater than or equal to the marked boiling point, and a pipeline with a nominal diameter greater than 25 mm.

[0047] refer to Figure 1 and Figure 2 As shown, there are generally some leakage risk locations 11 on the pressure gas pipeline system. The leakage risk location 11 refers to a location where the working gas is prone to leakage. The leakage risk location 11 can be located in the pressure pipeline, or in a valve interface, pressure pipeline, pressure vessel, reactor, fuel cell stack, electrolytic cell, etc. It should be noted that the device to be sealed 1 of the pressure pipeline generally refers to a pipeline section having at least one leakage risk location 11.

[0048] For example, the device to be sealed 1 may refer to a region where a connection structure is located in a pressure gas pipeline system. For another example, the device to be sealed 1 may refer to a region where a pump or a valve is located in a pressure gas pipeline system.

[0049] The sealing structure may include a sealing shell 21. The sealing shell 21 may be sleeved on the outside of the device to be sealed 1, thereby wrapping the leakage risk position 11 of the device to be sealed 1. For example, when the device to be sealed 1 is a partial pipeline section in a pressure pipeline, the sealing shell 21 may be sleeved on the radial outside of the above pipeline section to completely wrap the above pipeline section and improve the sealing effect.

[0050] The sealing structure may further include a sealing member 22. The sealing housing 21 may be fixedly connected to the device to be sealed 1 via the sealing member 22, so that a sealed cavity is formed between the sealing housing 21 and the device to be sealed 1. It should be noted that the sealing member 22 may be, for example, a sealing ring or a sealing ring, etc., which is not limited thereto.

[0051] Among them, a liquid-sealing liquid 27 may be provided in the sealing cavity. The liquid-sealing liquid 27 is used to liquid-seal the leakage risk position 11 of the device to be sealed 1. That is to say, the liquid-sealing liquid 27 at least submerges the leakage risk position 11 on the device to be sealed 1 to achieve a liquid-sealing effect. It should be noted that when the device to be sealed 1 includes one leakage risk position 11, the liquid-sealing liquid 27 needs to submerge the one leakage risk position 11. When the device to be sealed 1 includes more than one leakage risk position 11, the liquid-sealing liquid 27 needs to submerge more than one leakage risk position 11.

[0052] In the sealing structure, the pressure gas pipeline system is sealed by the liquid in the sealing cavity. Therefore, once the pressure gas pipeline system leaks, the leaked working gas will first enter the sealing cavity where the liquid is located, and gather above the liquid surface under the action of buoyancy, and will not leak into the environment. Moreover, after the working gas leaks, it generally gathers in a specific direction (for example, upward) under the action of buoyancy, and will not disperse. Therefore, there is no need to worry about the leaked working gas passing through the sealing shell 21.

[0053] In addition, because the sealing effect and ease of liquids are generally significantly higher than those of working gases (especially hydrogen), that is, when working gas sealing can be achieved in the air, liquid sealing can also be achieved. Therefore, there is no need to worry that the liquid-sealing liquid 27 will enter the pressure gas pipeline system through the leakage port of the working gas. Even if the pressure gas pipeline system leaks working gas, in the early stage of the working gas leakage, it is more difficult for the liquid-sealing liquid 27 in the sealing cavity to pass through the working gas leakage port on the pressure gas pipeline system than the working gas in the pressure gas pipeline system. Based on this, there is no need to worry about the liquid-sealing liquid 27 entering the pressure gas pipeline system.

[0054] In this sealing structure, the device to be sealed 1 is wrapped with liquid, and the liquid has a certain pressure inside, and can provide a higher pressure than the peripheral medium pressure in the unwrapped state. Generally, the internal pressure of the pressure gas pipeline system is relatively high. The above method can significantly reduce the pressure difference between the inside and outside of the pressure gas pipeline system, thereby improving the sealing effect to a certain extent (the sealing principle is that the pressure difference on both sides of the sealing structure is not enough to drive the working fluid gas to flow). In addition, when the working fluid gas in the pressure gas pipeline system leaks, when the working fluid gas is guided to leak, it will generally gather upward in the liquid because it leaks into the liquid sealing liquid 27 in the sealing cavity, thereby realizing the guidance of the flow path of the leaked working fluid gas, which can better avoid the random diffusion of the working fluid gas, and can also avoid major safety accidents caused by the leakage of the working fluid gas to a certain extent.

[0055] In an exemplary embodiment, reference Figure 1 and Figure 2 As shown, a sealing structure of a pressure gas pipeline system is provided. In the sealing structure, the liquid seal liquid 27 may include an inert liquid, that is, a liquid that does not react with the working gas in the pressure gas pipeline system. Here, "does not react" means that neither a chemical reaction (such as material conversion) nor a physical reaction (such as dissolution) occurs. For example, the liquid seal liquid 27 may be water, and the working gas may be methane, natural gas, hydrogen, nitric oxide or carbon monoxide, etc.

[0056] When the working gas in the device to be sealed 1 leaks, after the working gas leaks into the liquid in the sealed cavity, since no physical reaction or chemical reaction occurs, the leaked working gas can gather in a fixed direction (generally above the liquid surface of the liquid sealing liquid 27) under the action of buoyancy. As the leakage amount increases, the pressure above the liquid surface further increases, and the pressure in the sealed cavity further increases, which will reduce the pressure difference between the inside and outside of the device to be sealed 1, thereby suppressing the increase in leakage.

[0057] For a long-distance or complex pressure gas pipeline system, the pressure gas pipeline system may include multiple devices to be sealed 1. It should be noted that each device to be sealed 1 may be equipped with a sealing structure, or multiple devices to be sealed 1 may be equipped with the same sealing structure, which is not limited.

[0058] For example, refer to Figure 3 As shown, when multiple devices 1 to be sealed are configured with the same sealing structure, the sealing shell 21 of the sealing structure may include a common part 212 and multiple sealing parts 211, and the multiple sealing parts 211 correspond one-to-one to the multiple devices 1 to be sealed, that is, each device 1 to be sealed is configured with a sealing part 211.

[0059] Among them, in the mutually corresponding sealing parts 211 and the device to be sealed 1, the sealing part 211 is sleeved on the radial outer side of the device to be sealed 1, and the sealing part 211 is fixedly connected to the device to be sealed 1 through the sealing member 22, so that a first cavity is formed between the sealing part 211 and the device to be sealed 1. In other words, the multiple sealing parts 211 in the sealing structure can respectively form corresponding first cavities with the corresponding pipelines to be sealed, that is, multiple first cavities can be formed between the sealing structure and the pressure gas pipeline system. Therefore, it is possible to judge whether the corresponding device to be sealed 1 has a leak by observing whether bubbles 10 are generated in the first cavity, which makes it easier to timely understand the leakage of each device to be sealed 1, and there is no need to set more common parts, saving materials.

[0060] Among them, the common part 212 can be located at the top of the sealed shell 21, and a second cavity is formed inside the common part 212, and the second cavity is connected to the first cavity. It should be noted that the second cavity can be connected to all of the above-mentioned multiple first cavities. The common part 212 and the above-mentioned multiple sealing parts 211 can be an integrally formed structure or a split-formed structure, and are connected together by welding, bonding or other connection methods to achieve the connection between the second cavity and the first cavity. In this sealing structure, a sealed cavity is obtained by connecting the second cavity with multiple first cavities. That is, the sealed cavity may include the second cavity and the above-mentioned multiple first cavities.

[0061] It should be noted that the liquid seal liquid 27 can be disposed only in the first cavity or in the second cavity at the same time, and can be disposed according to actual conditions without limitation. In addition, the specific structural shapes of the sealing portion 211 and the common portion 212 can be disposed according to actual conditions without limitation.

[0062] In this sealing structure, when the working fluid gas in the device to be sealed 1 leaks, the leaked gas can first enter the corresponding first cavity, and then finally gather at the top of the sealed cavity, that is, gather at the second cavity. Through the above reasonable setting, the flow path of the leaked working fluid gas can be guided to avoid random diffusion.

[0063] Among them, reference Figure 3 or Figure 4As shown, the sealing structure may include a first pressure detection device 231. The first pressure detection device 231 may be, for example, a pressure sensor, which may be used to detect gas pressure, and the target environment in which it is used may be a working gas in a pressure gas pipeline system. In view of this, the first pressure detection device 231 may be disposed at the top of the sealed housing 21, and there may be a gap between the first pressure detection device 231 and the liquid seal liquid 27 to prevent the first pressure detection device 231 from being contaminated by the liquid seal liquid 27, thereby better ensuring that the first pressure detection device 231 can well detect the internal pressure of the working gas in the sealed cavity, so that the gas that has leaked out will not have an excessively high pressure.

[0064] As the leakage of the working fluid gas increases, the internal pressure of the working fluid gas in the sealed cavity will increase. When the above pressure is higher than a certain pressure value, it can be sensed by the first pressure detection device 231, and then the corresponding position of the sealed device 1 of the pressure gas pipeline system is prompted to have a gas leak, so as to timely understand the leakage situation. In addition, the change speed of the pressure value detected by the above first pressure detection device 231 can also represent the leakage rate of the working fluid gas, and the pressure value detected by the above first pressure detection device 231 can also represent the leakage amount of the working fluid gas. Therefore, the leakage rate of the working fluid gas can be calculated by the fitting curve or corresponding function between the change speed of the internal pressure value of the working fluid gas in the sealed cavity and the leakage rate, and the change speed of the pressure value detected by the first pressure detection device 231. Similarly, the leakage amount of the working fluid gas can be calculated by the fitting curve or corresponding function between the internal pressure value of the working fluid gas in the sealed cavity and the leakage amount, and the pressure value detected by the first pressure detection device 231.

[0065] Among them, reference Figure 5 As shown, the sealing structure may also include a second pressure detection device 232. The second pressure detection device 232 may be, for example, a pressure sensor. The pressure sensor may be used to detect the internal pressure of the liquid-sealing liquid 27, and the target environment in which it is used may be the liquid-sealing liquid 27 in the sealing cavity. In view of this, the second pressure detection device 232 may be disposed inside the liquid-sealing liquid 27 to better detect the internal pressure of the liquid-sealing liquid 27 in the sealing cavity.

[0066] As the leakage of the working fluid gas increases, the internal pressure of the working fluid gas in the sealing cavity will increase, thereby causing the pressure inside the liquid seal liquid 27 to increase. When the internal pressure of the liquid seal liquid 27 is higher than a certain pressure value, it can be sensed by the second pressure detection device 232, and then the corresponding position of the sealed device 1 of the pressure gas pipeline system is prompted to have a gas leak, so as to timely understand the leakage situation. In addition, the change speed of the pressure value detected by the second pressure detection device 232 can also represent the leakage rate of the working fluid gas, and the pressure value detected by the second pressure detection device 232 can also represent the leakage amount of the working fluid gas. Therefore, the leakage rate of the working fluid gas can be calculated by the fitting curve or corresponding function between the change speed of the internal pressure value of the liquid seal liquid 27 in the sealing cavity and the leakage rate, and the change speed of the pressure value detected by the second pressure detection device 232. Similarly, the leakage amount of the working fluid gas can be calculated by the fitting curve or corresponding function between the internal pressure value of the liquid seal liquid 27 in the sealing cavity and the leakage amount, and the pressure value detected by the second pressure detection device 232.

[0067] Among them, reference Figure 3 or Figure 4 As shown, the sealing structure may include a first pressure relief device 241. The first pressure relief device 241 is, for example, a pressure relief valve. The pressure relief valve may be used to relieve pressure for the working gas in the sealed cavity, and the target environment for its use may be the working gas. In view of this, the first pressure relief device 241 may be disposed at the top of the sealed housing 21, and there is a gap between the first pressure relief device 241 and the liquid seal liquid 27 to prevent the first pressure relief device 241 from being contaminated by the liquid seal liquid 27, thereby better ensuring that the first pressure relief device 241 can well relieve pressure for the working gas in the sealed cavity.

[0068] As the leakage of the working gas increases, the internal pressure of the working gas in the sealed cavity will increase. When the pressure is higher than a certain pressure value, the first pressure relief device 241 is triggered to release pressure, indicating that a gas leak has occurred at the location of the corresponding device to be sealed 1 of the pressure gas pipeline system, so as to timely understand the leakage situation. It should be noted that if the opening time and opening degree of the first pressure relief device 241 can be fed back to the control system in real time, the leakage amount of the working gas can also be obtained by integrating the flow along the opening time, thereby evaluating the leakage rate and leakage amount of the working gas in the pressure gas pipeline system.

[0069] Among them, reference Figure 5As shown, the sealing structure may also include a second pressure relief device 242. The second pressure relief device 242 may be, for example, a pressure relief valve, which may be used to relieve pressure on the liquid-sealing liquid 27 in the sealing cavity, and the target environment in which the pressure relief valve is used may be the liquid-sealing liquid 27 in the sealing cavity. In view of this, the second pressure relief device 242 may be disposed inside the liquid-sealing liquid 27 to better detect the pressure relief of the liquid-sealing liquid 27 in the sealing cavity.

[0070] As the leakage of the working gas increases, the internal pressure of the working gas in the sealing cavity will increase, thereby causing the pressure inside the liquid seal liquid 27 to also increase. When the internal pressure of the liquid seal liquid 27 is higher than a certain pressure value, the second pressure relief device 242 can be triggered to release pressure, indicating that a gas leak has occurred at the location of the corresponding device to be sealed 1 of the pressure gas pipeline system, so as to timely understand the leakage situation. It should be noted that if the opening time and opening degree of the second pressure relief device 242 can be fed back to the control system in real time, the leakage amount of the working gas can also be obtained by integrating the flow along the opening time, thereby evaluating the leakage rate and leakage amount of the working gas in the pressure gas pipeline system.

[0071] It should be noted that for long-distance or complex pressurized gas pipeline systems, sealing parts 211 can be set at multiple leakage risk positions 11, and a common part 212 can be set to guide all leaked working fluid gases to the second cavity formed by the above-mentioned common part 212 for centralized treatment. The first pressure detection device 231 or the first pressure relief device 241 can be set in the above-mentioned common part 212; or a sealing structure can be set at each leakage risk position 11, and then the first pressure detection device 231 or the first pressure relief valve can be set on the top of the sealing structure, so as to obtain the location of the leakage in time.

[0072] For a sealing structure provided with a plurality of sealing parts 211 and a single common part 212, it is not necessary to configure each device 1 to be sealed with a first pressure detection device 231 and / or a first pressure relief device 241. Instead, the first pressure detection device 231 and / or the first pressure relief device 241 may be provided only in the common part 212, thereby realizing leakage detection of the entire pressure gas pipeline system, saving the number of first pressure detection devices 231 and / or first pressure relief devices 241, and reducing costs.

[0073] In addition, refer to Figure 3 or Figure 6As shown, if it is necessary to accurately determine the specific leakage position, a visual detection device 25 can also be installed inside the liquid-sealing liquid 27. That is, the sealing structure may also include a visual detection device 25. The visual detection device 25 may be, for example, a visual sensor. The visual detection device 25 may be disposed inside the liquid-sealing liquid 27 to monitor the movement of the bubbles 10 inside the liquid-sealing liquid 27. Among them, the visual detection device 25 is installed on the necessary path for the bubble 10 to flow, for example, above the overall monitored position. When the working fluid gas leaks in the device to be sealed 1 of the pressure gas pipeline system, bubbles 10 may be generated in the liquid-sealing liquid 27 due to the leakage of the working fluid gas, and the bubbles 10 may move toward the top of the sealing cavity. In the pressure gas pipeline system, the specific leakage position of the working fluid gas can be determined more accurately based on the movement trajectory of the bubble 10 detected by the visual detection device 25.

[0074] Among them, reference Figure 3-Figure 6 As shown, the sealing structure may also include a liquid replacement device 26, which may be a liquid replacement valve. The liquid replacement device 26 may be disposed at the bottom of the sealing housing 21 to replace the liquid sealing liquid 27 in the sealing cavity.

[0075] This sealing structure can not only better achieve the sealing effect of the pressure gas pipeline system, but also better avoid the leakage of the working gas inside a certain pressure gas pipeline system (such as valve interface, pipeline, pressure vessel, reactor, fuel cell stack, electrolytic cell, etc.), and has a good sealing effect for the sealing and leakage protection of dangerous gases such as hydrogen, preventing the formation of large-scale leakage. At the same time, it can cooperate with other means (such as the first pressure detection device 231, the second pressure detection device 232, the first pressure relief device 241, the second pressure relief device 242, the visual detection device 25, etc.) to timely identify the leakage amount and location, solving the problem of rapid identification and positioning of working gas leakage in the pressure gas pipeline system.

[0076] In an exemplary embodiment, a sealing structure for a pressure gas pipeline system is provided. Figure 7 As shown, in the sealing structure, the liquid seal liquid 27 may include a liquid that reacts with the working gas in the pressure gas pipeline system. Here, "reacting" may include a chemical reaction (such as material conversion) or a physical reaction (such as dissolution). For example, the liquid seal liquid 27 may be water, and the working gas may be chlorine, ammonia or hydrogen sulfide, etc.

[0077] When the working gas in the device to be sealed 1 leaks, the working gas leaks into the liquid in the sealed cavity and reacts with the liquid-sealing liquid 27, thereby preventing the working gas from leaking out of the sealed cavity again and leaking into the environment.

[0078] The sealing structure may include a concentration detection device 28, which may be, for example, a concentration sensor. The concentration detection device 28 may be disposed inside the liquid seal liquid 27 to detect the concentration of a substance generated by the reaction between the liquid seal liquid 27 and the leaked working fluid gas. In the pressure gas pipeline system, it is possible to determine whether there is leakage of the working fluid gas by monitoring the changes in the liquid composition in the sealed cavity, and to determine information such as the leakage amount and leakage rate based on the concentration of the liquid composition in the sealed cavity.

[0079] The sealing structure may also include a liquid replacement device 26, which may be, for example, a liquid replacement valve. The liquid replacement device 26 may be disposed at the bottom of the sealing housing 21, and is used to replace the liquid sealing liquid 27 in the sealing cavity. For example, when the concentration detection device 28 detects that the liquid in the sealing cavity that reacts with the leaked gas has reached a certain proportion, the liquid replacement device 26 may be opened to replace the liquid in the sealing cavity, thereby ensuring that the liquid sealing liquid 27 is always maintained at a certain proportion, ensuring the absorption effect of the leaked gas, and ensuring the sealing effect.

[0080] The sealing structure can not only improve the sealing effect, but also prevent the working gas from leaking out of the sealed cavity again and leaking into the environment through the reaction between the liquid sealing liquid 27 and the leaked working gas. In addition, by setting the concentration detection device 28, it is also possible to determine whether there is leakage of the working gas, as well as to determine information such as the leakage amount and leakage rate.

[0081] In one exemplary embodiment, a pressurized gas pipeline system is provided. Figure 3 or Figure 4 As shown, the pressure gas pipeline system may include valve interface, pressure pipeline, pressure vessel, reactor, fuel cell stack, electrolytic cell, etc. There are generally some leakage risk positions 11 on the pressure gas pipeline system. The leakage risk position 11 refers to the position where the working gas is prone to leakage. The leakage risk position 11 can be located at the pressure pipeline, or at the valve interface, pressure pipeline, pressure vessel, reactor, fuel cell stack, electrolytic cell, etc.

[0082] For example, the device to be sealed 1 may refer to a region where a connection structure is located in a pressure gas pipeline system. For another example, the device to be sealed 1 may refer to a region where a pump or a valve is located in a pressure gas pipeline system.

[0083] The pressure gas pipeline system may include the sealing structures of the above-mentioned embodiments, and the sealing structure is used to liquid-seal the sealing device 1, so as to better avoid leakage of the working gas in the pressure gas pipeline system, better improve the safety of the pressure gas pipeline system, and better avoid major safety accidents caused by leakage.

[0084] Among them, the internal pressure of the pressure gas pipeline system (all absolute pressures, the same below) is p1, the atmospheric pressure is p0, the pressure inside the liquid sealing liquid 27 is p2, and the maximum pressure difference that the sealing shell 21 used to contain the liquid sealing liquid 27 can withstand is dp.

[0085] Among them, it is generally required that p1 is not less than p2, and p2 satisfies p0+dp>=p2>=p0-dp. When the working gas in the pressure gas pipeline leaks, p1 generally does not fluctuate significantly (because the internal gas flow is large and the pressure is high), and the leaked gas will gather above the liquid surface of the liquid-sealing liquid 27, thereby causing the internal pressure of the liquid-sealing liquid 27 to increase. In order to ensure that the liquid does not leak out and consider the design margin, the maximum pressure difference dp that the sealing shell 21 can withstand can satisfy dp>=p1-p0. Of course, the above design requirements can also be reduced by designing a pressure relief device (such as the first pressure relief device 241 and / or the second pressure relief device 242, etc.). For example, if the critical pressure of the first pressure relief device 241 is pc, then dp>=pc-p0, where pc <p1。

[0086] It should be noted that the pressure gas pipeline system proposed in the present disclosure can be applied to pressure gases that are difficult to determine leakage, such as hydrogen pipeline systems and natural gas pipeline systems that need to consider leakage issues. In addition, all pipeline systems that need to maintain normal operation for a period of time when leaking, or can be repaired without being affected, are suitable for the solution of the present disclosure regardless of the pressure gas.

[0087] In some embodiments,

[0088] The pressure gas pipeline system can be a pipeline system for hydrogen with a pressure greater than 0.1MPa. The device to be sealed 1 of the pressure gas pipeline system can be a connection structure, or a section including a pump, a pipe, a valve, etc. The main body of the sealing structure is a sealing shell 21, and the sealing shell 21 can be a sealed water tank. The sealed water tank and the device to be sealed 1 are strictly sealed by a sealing ring. The liquid sealing liquid 27 inside the sealed water tank is a liquid that does not react with the working gas in the pipeline and does not affect each other. For example, the sealed water tank can use deionized water as the liquid sealing liquid 27.

[0089] A water changing device may be provided at the bottom of the sealed water tank, and the water changing device may be, for example, a water changing valve. The water changing valve is used to change the liquid in the sealed water tank. The top of the sealed water tank is provided with a first pressure relief device 241, and the first pressure relief device 241 is, for example, a pressure relief valve, which is used to change the gas leaked into the sealed water tank and ensure that the sealed water tank complies with the design of the normal pressure sealed water tank and the liquid seal within a reasonable range.

[0090] In the pressure gas pipeline system, leakage can be determined by the increase in internal pressure of the sealed water tank and the bubbles 10. The location of gas leakage can also be determined by an intermittent design (dividing the entire sealed water tank into several sealing parts 211 cut along the pressure gas pipeline system) and by monitoring the location where the bubbles 10 are generated based on a visual detection device 25.

[0091] In this embodiment, the air pressure of the pressure gas pipeline system can be designed to be greater than the pressure of the first pressure relief device 241 on the top of the sealed water tank, and greater than the air pressure in the sealed water tank, and the height of the liquid seal liquid 27 is given to achieve the purpose of isolating the gas in the pressure gas pipeline system from the gas in the sealed water tank. By the difference in air pressure between the pressure gas pipeline system and the sealed water tank, and the area of ​​the leakage position, it is ensured that the system can operate normally for a period of time before the first pressure relief device 241 of the sealed water tank releases pressure during leakage, so as to carry out emergency repairs without affecting the use. By filling the sealed water tank with inert liquid instead of air to provide normal pressure, the safety of the leakage is guaranteed. Thereby solving the explosion safety hazard of leakage of the existing pressure gas pipeline system filled with dangerous gas, and ensuring the normal operation of the pressure gas pipeline system while completing the emergency repair.

[0092] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0093] It should be noted that the phrases "one implementation", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0094] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more limiting values, the elements defined by the sentence "comprise a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0095] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A sealing structure for a pressure gas pipeline system, characterized in that: The sealing structure comprises a sealing housing; The sealing housing is sleeved on the outside of the device to be sealed of the pressure gas pipeline system, the device to be sealed has at least one leakage risk position, and the device to be sealed is used to contain pressure gas; The sealing structure comprises a sealing member, and the sealing housing is fixedly connected to the device to be sealed via the sealing member; A sealed cavity is formed between the sealed housing and the device to be sealed. A liquid-sealing liquid is provided in the sealed cavity. The liquid-sealing liquid at least submerges the at least one leakage risk position. The liquid-sealing liquid is used to liquid-seal the working gas leakage position of the device to be sealed.

2. The sealing structure according to claim 1, characterized in that: The liquid seal liquid includes a liquid that does not react with the working gas in the pressure gas pipeline system.

3. The sealing structure according to claim 2, characterized in that: The pressure gas pipeline system comprises a plurality of the devices to be sealed, the sealed housing comprises a common portion and a plurality of sealing portions, and the plurality of sealing portions correspond one to one with the plurality of the devices to be sealed; In the sealing part and the device to be sealed corresponding to each other, the sealing part is sleeved on the radial outer side of the device to be sealed, and the sealing part is fixedly connected to the device to be sealed through the sealing member, and a first cavity is formed between the sealing part and the device to be sealed; The common part is located at the top of the sealed housing, a second cavity is formed inside the common part, and the second cavity is communicated with the first cavity; The sealed cavity includes the first cavity and the second cavity.

4. The sealing structure according to claim 2, characterized in that: The sealing structure comprises a first pressure detection device, the first pressure detection device is arranged on the top of the sealing shell, and there is a gap between the first pressure detection device and the liquid seal liquid, and the first pressure detection device is used to detect the internal pressure of the working fluid gas in the sealing cavity; and / or, The sealing structure includes a second pressure detection device, which is arranged inside the liquid-sealing liquid and is used to detect the internal pressure of the liquid-sealing liquid.

5. The sealing structure according to claim 2, characterized in that: The sealing structure comprises a first pressure relief device, which is arranged at the top of the sealing shell, and there is a gap between the first pressure relief device and the liquid seal liquid, and the first pressure relief device is used to relieve pressure of the working gas in the sealing cavity; and / or, The sealing structure includes a second pressure relief device, which is arranged inside the liquid-sealing liquid and is used to relieve pressure on the liquid-sealing liquid.

6. The sealing structure according to claim 2, characterized in that: The sealing structure comprises a visual detection device, which is arranged inside the liquid-sealing liquid and is used to monitor the movement of bubbles inside the liquid-sealing liquid.

7. The sealing structure according to claim 1, characterized in that: The liquid seal liquid includes a liquid that reacts with the working gas in the pressure gas pipeline system.

8. The sealing structure according to claim 7, characterized in that: The sealing structure comprises a concentration detection device, which is arranged inside the liquid-sealing liquid and is used to detect the concentration of a substance generated by the reaction between the liquid-sealing liquid and the leaked working fluid gas.

9. The sealing structure according to any one of claims 1 to 8, characterized in that: The sealing structure comprises a liquid replacement device, which is arranged at the bottom of the sealing shell and is used to replace the liquid sealing liquid.

10. A pressure gas pipeline system, characterized in that: The pressure gas pipeline system comprises a device to be sealed for filling pressure gas, and a sealing structure as claimed in any one of claims 1-9.

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