CN114151729A - Safe diffusion system and method for liquid hydrogen storage hydrogen filling station - Google Patents
Safe diffusion system and method for liquid hydrogen storage hydrogen filling station Download PDFInfo
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- CN114151729A CN114151729A CN202111358537.1A CN202111358537A CN114151729A CN 114151729 A CN114151729 A CN 114151729A CN 202111358537 A CN202111358537 A CN 202111358537A CN 114151729 A CN114151729 A CN 114151729A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the technical field of hazardous gas emission, and provides a safe diffusion system and a safe diffusion method for a liquid hydrogen storage hydrogen filling station, wherein the safe diffusion system at least comprises: the emptying module comprises a first emptying unit and a second emptying unit which are mutually independent, the first emptying unit is suitable for emptying low-pressure liquid hydrogen, and the second emptying unit is suitable for emptying high-pressure hydrogen; the safety prevention and control module comprises a flame monitoring unit and a fire extinguishing unit, wherein the flame monitoring unit is positioned at the outlet of the emptying module and is suitable for monitoring a flame signal; the fire extinguishing unit is connected with the emptying module and is suitable for extinguishing fire to the emptying module after the flame monitoring unit monitors the flame signal. The diffusion system comprises a first venting unit and a second venting unit which are independent of each other, high-pressure hydrogen and low-pressure liquid hydrogen are separately discharged, and potential safety hazards caused by mixed discharge of the high-pressure hydrogen and the low-pressure liquid hydrogen can be reduced; meanwhile, the flame monitoring unit and the fire extinguishing unit are arranged, so that fire can be extinguished in time when a fire breaks out in the discharging process.
Description
Technical Field
The invention relates to the technical field of hazardous gas emission, in particular to a safe diffusion system and a safe diffusion method for a liquid hydrogen storage hydrogen filling station.
Background
Hydrogen is a flammable and explosive substance, and the safe emission thereof is one of the important problems encountered in the large-scale application of hydrogen energy. In the liquid hydrogen storage and hydrogenation station, hydrogen mainly has two storage forms of high-pressure hydrogen and low-pressure liquid hydrogen. When a liquid hydrogen storage station needs to discharge hydrogen, the problem of how to discharge hydrogen in two storage forms is faced. Firstly, high pressure and low pressure can not be discharged in series, so that the situation that high pressure flows back to enter a low pressure system to cause potential safety hazards of process equipment is avoided. Moreover, the discharge flow rate of high-pressure hydrogen and low-pressure liquid hydrogen is different greatly, and according to the physical characteristics of small latent heat of hydrogen vaporization, small viscosity and the like, the two are discharged simultaneously, so that severe disturbance of fluid can be formed, static accumulation and unstable flow rate are easily caused, even fire and explosion can occur, and great potential safety hazards exist, so that a safe diffusion system needs to be provided, the discharge of hydrogen media in different forms of a hydrogenation station is met, and the guarantee is provided for the safe operation of the hydrogenation station.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that when the liquid hydrogen storage hydrogen charging station needs to discharge hydrogen, if the hydrogen in two storage forms is discharged simultaneously, the hydrogen is easy to ignite and explode, and a large potential safety hazard exists, so that the safe diffusion system and the safe diffusion method for the liquid hydrogen storage hydrogen charging station are provided.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a safe diffusion system of a liquid hydrogen storage hydrogen filling station, which at least comprises: the emptying module comprises a first emptying unit and a second emptying unit which are mutually and independently arranged, the first emptying unit is suitable for emptying low-pressure liquid hydrogen, and the second emptying unit is suitable for emptying high-pressure hydrogen; the safety prevention and control module comprises a flame monitoring unit and a fire extinguishing unit, wherein the flame monitoring unit is positioned at the outlet of the emptying module and is suitable for monitoring a flame signal; the fire extinguishing unit is connected with the emptying module and is suitable for extinguishing the fire of the emptying module after the flame monitoring unit monitors the flame signal.
Further, the first emptying unit comprises a discharge header pipe, a discharge branch pipe, an emptying pipe and an emptying connector; one end of the discharge branch pipe is connected with hydrogen storage equipment to be discharged, and the other end of the discharge branch pipe is communicated with the discharge header pipe; the discharge header pipe is communicated with the emptying pipe; the emptying interface is arranged at the outlet of the emptying pipe.
Further, the emptying interface comprises a connecting part and an emptying part; one end of the connecting part is connected with the emptying pipe, and the other end of the connecting part is connected with the emptying part; the emptying part is of an H-shaped structure and comprises four air outlets, and a filter screen is arranged at each air outlet; each air outlet is inclined downwards by a preset angle which ranges from 10 degrees to 15 degrees.
Further, the first emptying unit also comprises an air seal pipeline and a replacement pipeline; one end of the air seal pipeline is connected with an air seal air source, and the other end of the air seal pipeline is connected with one end of the emptying pipe close to the emptying interface; one end of the displacement pipeline is connected with a displacement air source, and the other end of the displacement pipeline is connected with one end, far away from the emptying interface, of the emptying pipe.
Furthermore, one end of the emptying pipe, which is far away from the emptying connector, is a sealing structure, and a drain valve is arranged at the sealing structure.
Further, the second emptying unit and the first emptying unit have the same structure.
Further, the flame monitoring unit is a flame detector; the fire extinguishing unit comprises a fire extinguishing gas pipeline and a fire arrestor; one end of the fire extinguishing gas pipeline is connected with a fire extinguishing gas source, and the other end of the fire extinguishing gas pipeline is connected with one end of the emptying pipe close to the emptying interface; the flame arrester is arranged on the emptying pipe and is positioned at one end, close to the emptying interface, of the emptying pipe.
Further, the safety diffusion system of the liquid hydrogen storage hydrogen filling station also comprises a remote auxiliary gas distribution module; the remote auxiliary gas distribution module comprises a gas distribution table and a control table which are in signal connection; the gas distribution table is communicated with the emptying module and is suitable for providing a gas seal gas source and a displacement gas source for the emptying module; the gas distribution table is communicated with the fire extinguishing unit and is suitable for providing a fire extinguishing gas source for the fire extinguishing unit.
Further, the remote auxiliary gas distribution module further comprises a control valve; the outlet of the air seal gas source, the outlet of the replacement gas source and the outlet of the fire extinguishing gas source are provided with the control valves; each control valve is electrically connected with the console.
Further, the safety diffusing system of the liquid hydrogen storage hydrogen filling station also comprises a grounding piece, one end of the grounding piece is connected with the emptying pipe, and the other end of the grounding piece is suitable for being connected with a grounding net of the hydrogen filling station. The invention also provides a diffusing method of the liquid hydrogen storage hydrogen filling station, which comprises the following steps: carrying out replacement treatment on the gas in the emptying pipe; emptying the hydrogen storage equipment to be emptied, wherein the emptying pipe is subjected to air sealing treatment in the emptying interval period of low-pressure liquid hydrogen; monitoring the flame signal of the emptying pipe, suspending emptying of the hydrogen storage equipment to be emptied when the flame signal is monitored, and extinguishing the emptying pipe.
Further, the diffusing method further comprises the following steps: the flare is sized according to the total emissions of each hydrogen storage device to be vented, wherein the gas flow rate in the flare is no more than 150 m/s.
The technical scheme of the invention has the following advantages:
the safe releasing system of the liquid hydrogen storage hydrogen filling station comprises a first releasing unit and a second releasing unit which are independent from each other, high-pressure hydrogen and low-pressure liquid hydrogen are separately discharged, and potential safety hazards caused by mixed discharge of the high-pressure hydrogen and the low-pressure liquid hydrogen can be reduced; meanwhile, the flame monitoring unit and the fire extinguishing unit are arranged, so that when a fire breaks out in the discharging process, the fire can be extinguished in time, and the reliability of the discharging process is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a safety bleeding system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention;
FIG. 2 is a front view of a vent interface in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention;
FIG. 3 is a side view of a vent interface in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention;
FIG. 4 is a top view of a vent interface in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a remote auxiliary gas distribution module in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the invention; fig. 6 is a flowchart of a bleeding method of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention.
Description of reference numerals:
1. a discharge branch pipe; 2. A discharge header pipe; 3. An emptying pipe;
4. replacing the pipeline; 5. A fire extinguishing gas line; 6. A gas seal pipeline;
7. a flame arrestor; 8. An emptying interface; 9. A flame detector;
10. a drain valve; 11. A venting portion; 12. A connecting portion;
13. filtering with a screen; 14. A ground member; 15. A console;
16. a gas distribution table.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
FIG. 1 is a schematic diagram of a safety bleeding system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention; as shown in fig. 1, the present embodiment provides a safety relief system for a liquid hydrogen storage hydrogen refueling station, which at least includes: the emptying module comprises a first emptying unit and a second emptying unit which are mutually independent, the first emptying unit is suitable for emptying low-pressure liquid hydrogen, and the second emptying unit is suitable for emptying high-pressure hydrogen; for example, the second venting unit may be identical in structure to the first venting unit.
The safety prevention and control module comprises a flame monitoring unit and a fire extinguishing unit, wherein the flame monitoring unit is positioned at the outlet of the emptying module and is suitable for monitoring a flame signal; for example, the outlet of the first emptying unit and the outlet of the second emptying unit are both provided with a flame monitoring unit.
The fire extinguishing unit is connected with the emptying module and is suitable for extinguishing fire to the emptying module after the flame monitoring unit monitors the flame signal. In a similar way, the first emptying unit and the second emptying unit are both provided with fire extinguishing units. When the flame monitoring unit monitors a flame signal, the fire extinguishing unit can be started in time to extinguish fire.
The safe releasing system of the liquid hydrogen storage hydrogen filling station comprises a first releasing unit and a second releasing unit which are independent from each other, high-pressure hydrogen and low-pressure liquid hydrogen are separately discharged, and potential safety hazards caused by mixed discharge of the high-pressure hydrogen and the low-pressure liquid hydrogen can be reduced; meanwhile, the flame monitoring unit and the fire extinguishing unit are arranged, so that when a fire breaks out in the discharging process, the fire can be extinguished in time, and the reliability of the discharging process is improved.
In this embodiment, the first venting unit includes a discharge header pipe 2, a discharge branch pipe 1, a venting pipe 3 and a venting connector 8; wherein, a plurality of discharge branch pipes 1 can be provided, one end of each discharge branch pipe 1 is connected with the corresponding hydrogen storage equipment to be emptied, and the other end is communicated with the discharge header pipe 2. All the discharge ports of the hydrogenation station are discharged in a centralized mode and are collected through the discharge branch pipes 1 to enter the discharge header pipe 2.
Wherein, discharge header 2 can the level set up, and blow-down pipe 3 can vertical setting, and discharge header 2 can be linked together with the position that blow-down pipe 3 is close to the well lower part, avoids discharge header direct and is connected bottom the blow-down pipe, sets up like this, can be at blow-down pipe 3 because the special reason intake and when too late through drain valve 10 drainage, avoids water directly to get into discharge header 2. A flare interface 8 is provided at the top outlet of the flare 3. Wherein the discharge header 2 and the blow-down pipes 3 can be dimensioned according to the total amount of discharge from the respective discharge branch pipes 1, and the maximum flow rate of hydrogen in the blow-down pipes 3 does not exceed 150 m/s.
FIG. 2 is a front view of a vent interface in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention; FIG. 3 is a side view of a vent interface in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention; FIG. 4 is a top view of a vent interface in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention; as shown in fig. 2, 3 and 4, in the present embodiment, the purge interface 8 includes a connection portion 12 and a purge portion 11; the connecting part 12 is a straight pipe, one end of the connecting part 12 is connected with the emptying pipe 3, and the other end is connected with the emptying part 11; the emptying part 11 is of an H-shaped structure, the connecting part 12 is connected with a connecting pipe between two parallel pipes of the H-shaped structure, the emptying part 11 comprises four air outlets, a filter screen 13 is arranged at each air outlet, and for example, the mesh of each filter screen 13 is not more than 1cm multiplied by 1 cm; each air outlet is inclined downwardly by a predetermined angle in the range of 10 to 15, for example, 12. So set up, can prevent that the rainwater from flowing backward in the blow-down pipe 3 from emptying interface 8.
In this embodiment, the first emptying unit further includes a gas seal pipeline 6 and a replacement pipeline 4; for example, one end of the air seal pipeline 6 is connected with an air seal air source, and the other end of the air seal pipeline is connected with one end of the emptying pipe 3 close to the emptying interface 8; for example, the displacement line 4 is connected at one end to the displacement gas source and at the other end to the end of the vent tube 3 remote from the vent interface 8. For example, the level of the junction of the discharge header 2 and the flare 3 is between the displacement line 4 and the gas seal line 6. So set up, be favorable to carrying out abundant replacement to the air in the blow-down pipe 3, improve the replacement effect. Meanwhile, the gas seal pipeline 6 can better isolate the hydrogen in the discharge header pipe 2 from the outside air. The physical properties of liquid hydrogen discharge and gas hydrogen are different, and the liquid hydrogen discharge also faces the discharge of low-temperature liquid, so that a discharge pipeline is frosted, and even a large amount of solid air or liquefied air appears. The air seal pipeline 6 is used in the discharge gap of liquid hydrogen, so that solid air, liquefied air and water vapor in the process can be prevented from being sucked back into the discharge cavity, and damage to equipment and pipelines to different degrees caused by the solid air, the liquefied air and the water vapor can be avoided. Wherein, the gas seal gas source can be hydrogen or helium. The displacement gas source may be nitrogen. Wherein, for the second emptying unit, the air seal pipeline 6 can be cancelled, and the discharge of the second emptying unit is not influenced.
In this embodiment, the end of the emptying pipe 3 far from the emptying connector 8 is a sealing structure, and a drain valve 10 is arranged at the sealing structure. For example, the bottom end of the emptying pipe 3 can be blocked, and the lowest part is connected with the drain valve 10. So set up for the bottom of blow-down pipe 3 can the splendid attire because reason such as weather gets into the ponding in the blow-down pipe. Further, the drain valve 10 may be opened to drain the accumulated water, if necessary.
In this embodiment, the flame monitoring unit is a flame detector 9; because, hydrogen flame is light blue, and naked eye hardly discovers, consequently can in time catch the flame signal with the help of flame detector 9 to send the warning, can send the flame signal to the control cabinet simultaneously, the control cabinet can control the unit of putting out a fire and put out a fire.
Wherein, the fire extinguishing unit comprises a fire extinguishing gas pipeline 5 and a fire arrestor 7; one end of the fire extinguishing gas pipeline 5 is connected with a fire extinguishing gas source, and the other end of the fire extinguishing gas pipeline is connected with one end of the emptying pipe 3 close to the emptying connector 8; wherein the position of the connection of the fire extinguishing gas pipe 5 and the blow-down pipe 3 can be higher than the position of the connection of the discharge header 2 and the blow-down pipe 3. Wherein, the fire extinguishing gas source can be high-pressure nitrogen.
Wherein, spark arrester 7 can be installed on blow-down pipe 3 through the flange, and is located the one end that blow-down pipe 3 is close to unloading interface 8. So set up, can prevent that flame suck-back gets into blow-down pipe 3, and high-pressure nitrogen gas can dilute the peripheral air of drain rapidly to reach the purpose of putting out a fire, prevent that flame from wafting and arousing the conflagration of other positions.
FIG. 5 is a schematic diagram of a remote auxiliary gas distribution module in a safety vent system of a liquid hydrogen storage hydrogen refueling station in an embodiment of the invention; as shown in fig. 5, in this embodiment, the safety relief system of the liquid hydrogen storage hydrogen refueling station further includes a remote auxiliary gas distribution module; the remote auxiliary gas distribution module comprises a gas distribution table 16 and a control table 15 which are in signal connection; the gas distribution table 16 is communicated with the emptying module and is suitable for providing a gas seal gas source and a displacement gas source for the emptying module; the gas distribution station 16 is in communication with the fire suppression unit and is adapted to provide a source of fire suppression gas to the fire suppression unit.
Wherein the gas distribution station 16 may be located within the hydroprocessing station at a location remote from the blowdown module. The gas distribution table 16 mainly includes a plurality of sets of gas distribution pipelines, and each set of gas distribution pipeline is used for distributing nitrogen or hydrogen. Each group of air distribution pipeline mainly comprises an air source pipeline, a manual valve, a filter, a pressure reducer, a remote control valve, a sensor and the like. For example, the outlet ends of one of the sets of gas lines are connected to a replacement line to provide the nitrogen gas required for replacement. For example, the gas outlet ends of one group of gas pipelines are communicated with a gas seal pipeline, so that hydrogen required by gas seal can be provided.
For example, the gas outlet ends of one group of gas pipelines are communicated with a fire extinguishing gas pipeline, so that nitrogen required for fire extinguishing can be provided. When receiving alarm signal, can make nitrogen gas enter into the gas pipeline of putting out a fire through control cabinet remote control gas distribution platform, and the non-combustible gas is discharged from the drain in a large number, can completely cut off the contact of oxygen in combustible gas and the air in the twinkling of an eye, reaches the purpose of putting out a fire. Meanwhile, a large amount of non-combustible gas can reduce the concentration of hydrogen in the surrounding air, so that hydrogen accumulation is avoided, and other substances nearby are prevented from being ignited.
The console 15 may include, among other things, a measurement device and a control device. The main machines of the measuring equipment and the control equipment can be both positioned between the measurement and control of the hydrogen station and are connected with the gas distribution table 16 through cables. The measurement device may remotely monitor a status parameter of the gas distribution table 16 using sensors within the gas distribution table 16. The control device may remotely control the operating state of remotely controlled valves within the gas distribution station 16 via the cable.
In this embodiment, the safety relief system of the liquid hydrogen storage hydrogen filling station further comprises a control valve; the outlet of the air seal gas source, the outlet of the replacement gas source and the outlet of the fire extinguishing gas source are all provided with control valves; each control valve is electrically connected with the control console. Wherein, the console can control the working state of each control valve according to the situation so as to adjust the outflow speed of the gas. According to the arrangement, the system can be remotely operated through the control console, so that man-machine isolation is realized, and the system is safer and more convenient.
In this embodiment, the safe emission system of the liquid hydrogen storage hydrogen station further includes a grounding part 14, the grounding part 14 includes a connector and a grounding flat steel, the grounding flat steel connects the emptying pipe with the grounding grid of the hydrogen station through the connector, so as to ensure that the grounding resistance value meets the requirement, and avoid the occurrence of the condition of electric spark ignition caused by static accumulation in the discharge process.
Fig. 6 is a flowchart of a method for bleeding a liquid hydrogen storage hydrogen refueling station in an embodiment of the present invention, and as shown in fig. 6, in another embodiment, a method for bleeding a liquid hydrogen storage hydrogen refueling station is further provided, which includes the following steps: carrying out replacement treatment on the gas in the emptying pipe 3; emptying the hydrogen storage equipment to be emptied, wherein the emptying pipe 3 is subjected to air sealing treatment in the emptying interval period of low-pressure liquid hydrogen; monitoring the flame signal of the emptying pipe 3, suspending the emptying of the hydrogen storage equipment to be emptied when the flame signal is monitored, and simultaneously carrying out fire extinguishing treatment on the emptying pipe 3.
In this embodiment, the diffusing method further includes: the flare 3 is dimensioned according to the total discharge capacity of the respective hydrogen storage plant to be vented, wherein the gas flow rate in the flare 3 does not exceed 150 m/s.
When the fire extinguishing device is used, the control valve, the air seal air source, the replacement air source and the fire extinguishing air source are ensured to be in normal working states. Before each hydrogen storage device to be emptied in the hydrogenation station is emptied, the emptying pipe 3 and the discharge header pipe 2 are replaced by nitrogen in a replacement pipeline 4 in advance, the pressure of a replacement opening can be 0.2 MPa-0.5 MPa, the replacement time can be 2 min-5 min, and the specific pressure and time can be properly adjusted according to the pipe diameter and the discharge height of the emptying pipe 3.
And then, after the replacement is finished, each discharge branch can normally discharge low-pressure low-temperature liquid hydrogen or high-pressure hydrogen. The flame monitoring unit is always required to be in a working state during the discharging process.
When the low-temperature liquid hydrogen is discharged or is intermittent, the gas seal pipeline 6 needs to be opened, the medium of the gas seal pipeline 6 needs to be hydrogen or helium, and the gas seal pipeline 6 stops gas seal after the pipeline is reheated. The hydrogen flow rate of the hydrogen discharge of the gas seal pipeline 6 needs to be controlled, and the hydrogen flow rate at the pipe orifice of the emptying pipe 3 is ensured to be within a safe flow rate range.
In this embodiment, the discharging of the low-pressure low-temperature liquid hydrogen mainly includes discharging of liquid hydrogen media such as discharging of a liquid hydrogen storage tank and discharging of a pipeline. The discharge of the high-pressure hydrogen mainly comprises the discharge of all high-pressure hydrogen in the hydrogen filling station, including pipeline replacement, safety valve diffusion, pipeline deflation and the like.
In this embodiment, according to the construction scale of the hydrogen station, it is necessary to count and classify parameters such as discharge flow, pressure, and temperature of each hydrogen discharge branch. The total discharge of the safety relief device is the sum of all the possible simultaneous discharges, and the design of the discharge header 2 and the blow-down pipe 3 is performed.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (12)
1. A safe bleeding system of a liquid hydrogen storage hydrogen refueling station, characterized by comprising at least:
the emptying module comprises a first emptying unit and a second emptying unit which are mutually and independently arranged, the first emptying unit is suitable for emptying low-pressure liquid hydrogen, and the second emptying unit is suitable for emptying high-pressure hydrogen;
the safety prevention and control module comprises a flame monitoring unit and a fire extinguishing unit, wherein the flame monitoring unit is positioned at the outlet of the emptying module and is suitable for monitoring a flame signal; the fire extinguishing unit is connected with the emptying module and is suitable for extinguishing the fire of the emptying module after the flame monitoring unit monitors the flame signal.
2. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 1,
the first emptying unit comprises a discharge header pipe, a discharge branch pipe, an emptying pipe and an emptying connector;
one end of the discharge branch pipe is connected with hydrogen storage equipment to be discharged, and the other end of the discharge branch pipe is communicated with the discharge header pipe;
the discharge header pipe is communicated with the emptying pipe;
the emptying interface is arranged at the outlet of the emptying pipe.
3. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 2,
the emptying interface comprises a connecting part and an emptying part;
one end of the connecting part is connected with the emptying pipe, and the other end of the connecting part is connected with the emptying part;
the emptying part is of an H-shaped structure and comprises four air outlets, and a filter screen is arranged at each air outlet;
each air outlet is inclined downwards by a preset angle which ranges from 10 degrees to 15 degrees.
4. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 2,
the first emptying unit further comprises an air seal pipeline and a replacement pipeline;
one end of the air seal pipeline is connected with an air seal air source, and the other end of the air seal pipeline is connected with one end of the emptying pipe close to the emptying interface;
one end of the displacement pipeline is connected with a displacement air source, and the other end of the displacement pipeline is connected with one end, far away from the emptying interface, of the emptying pipe.
5. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 2,
one end of the emptying pipe, which is far away from the emptying connector, is a sealing structure, and a drain valve is arranged at the sealing structure.
6. A safety bleeding system for a liquid hydrogen storage hydrogen refueling station as claimed in any one of claims 2 to 5,
the second emptying unit and the first emptying unit have the same structure.
7. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 4,
the flame monitoring unit is a flame detector;
the fire extinguishing unit comprises a fire extinguishing gas pipeline and a fire arrestor;
one end of the fire extinguishing gas pipeline is connected with a fire extinguishing gas source, and the other end of the fire extinguishing gas pipeline is connected with one end of the emptying pipe close to the emptying interface;
the flame arrester is arranged on the emptying pipe and is positioned at one end, close to the emptying interface, of the emptying pipe.
8. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 7,
the system also comprises a remote auxiliary gas distribution module;
the remote auxiliary gas distribution module comprises a gas distribution table and a control table which are in signal connection;
the gas distribution table is communicated with the emptying module and is suitable for providing a gas seal gas source and a displacement gas source for the emptying module;
the gas distribution table is communicated with the fire extinguishing unit and is suitable for providing a fire extinguishing gas source for the fire extinguishing unit.
9. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 8,
the remote auxiliary gas distribution module further comprises a control valve;
the outlet of the air seal gas source, the outlet of the replacement gas source and the outlet of the fire extinguishing gas source are provided with the control valves;
each control valve is electrically connected with the console.
10. The safety relief system for a liquid hydrogen storage hydrogen refueling station according to claim 2,
the device also comprises a grounding piece, one end of the grounding piece is connected with the emptying pipe, and the other end of the grounding piece is suitable for being connected with a grounding grid of the hydrogen filling station.
11. A safe diffusion method of a liquid hydrogen storage hydrogen filling station is characterized by comprising the following steps:
carrying out replacement treatment on the gas in the emptying pipe;
emptying the hydrogen storage equipment to be emptied, wherein the emptying pipe is subjected to air sealing treatment in the emptying interval period of low-pressure liquid hydrogen;
monitoring the flame signal of the emptying pipe, suspending emptying of the hydrogen storage equipment to be emptied when the flame signal is monitored, and extinguishing the emptying pipe.
12. The method for safely discharging a liquid hydrogen storage hydrogen refueling station according to claim 11, further comprising:
the flare is sized according to the total emissions of each hydrogen storage device to be vented, wherein the gas flow rate in the flare is no more than 150 m/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111358537.1A CN114151729A (en) | 2021-11-16 | 2021-11-16 | Safe diffusion system and method for liquid hydrogen storage hydrogen filling station |
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| CN202111358537.1A CN114151729A (en) | 2021-11-16 | 2021-11-16 | Safe diffusion system and method for liquid hydrogen storage hydrogen filling station |
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| CN114151729A true CN114151729A (en) | 2022-03-08 |
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| CN202111358537.1A Pending CN114151729A (en) | 2021-11-16 | 2021-11-16 | Safe diffusion system and method for liquid hydrogen storage hydrogen filling station |
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