CN113623537B - Gas discharge control method for hydrogenation station - Google Patents
Gas discharge control method for hydrogenation station Download PDFInfo
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- CN113623537B CN113623537B CN202110930822.XA CN202110930822A CN113623537B CN 113623537 B CN113623537 B CN 113623537B CN 202110930822 A CN202110930822 A CN 202110930822A CN 113623537 B CN113623537 B CN 113623537B
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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
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/012—Hydrogen
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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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
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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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- 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
- Y02E60/34—Hydrogen distribution
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Pipeline Systems (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a hydrogen discharge system and a control method, wherein the hydrogen discharge system comprises a hydrogen discharge main path, and the hydrogen discharge main path is sequentially connected with a breaking valve, a pressure gauge, a one-way valve, an inlet stop valve, a filter, an outlet stop valve and a pneumatic valve; the hydrogen unloading system also comprises a nitrogen purging branch, a diffusing branch, an instrument air inlet and a triple piece, pneumatic valves are arranged on the hydrogen unloading main circuit, the nitrogen purging branch and the diffusing branch, the triple piece is fixedly connected to the instrument air inlet, the triple piece is respectively connected with the pneumatic valves through pipelines, and electromagnetic valves are arranged between the triple piece and the pneumatic valves; aims to solve the technical problems of complex structure, difficult operation and low safety of the related gas discharging system.
Description
Technical Field
The invention relates to the technical field of new energy equipment, in particular to a hydrogen station gas unloading control method.
Background
With the increase of the population base of human beings and the continuous development of scientific technology, the problems of the continuous consumption of non-renewable resources such as fossil fuel, coal, natural gas and the like and the pollution of natural environment are aggravated day by day. The exploration and development of a sustainable, clean energy technology is an urgent need to meet the development of human society, and is one of the hottest and most challenging topics worldwide nowadays. The hydrogen energy is an extremely abundant, inexhaustible and inexhaustible energy which can be developed nowadays. Hydrogen is an ideal clean energy carrier, which is recognized by the world and is the most promising new clean energy for people in the 21 st century, and the development and application of hydrogen energy are greatly enthusiastic and hopeful, so that various devices such as a hydrogen station, a hydrogen energy automobile, a hydrogen fuel cell and the like, and derived products are produced.
As a green and environment-friendly energy source, hydrogen is being vigorously developed in China to serve as a hydrogen refueling station, and a gas discharging column is important equipment for delivering and using the hydrogen refueling station. After the hydrogen is filled in the pipe transportation vehicle from the hydrogen production station and transported to the hydrogen filling station, the high-pressure hydrogen in the pipe transportation vehicle needs to be unloaded into the hydrogen storage tank of the hydrogen filling station by using the gas unloading column, and the gas unloading column plays the role of hydrogen unloading equipment. The gas unloading process comprises the following steps: one end of the air discharging column is connected with the pipe conveying vehicle through an air discharging hose, and the other end of the air discharging column is connected with the compressor sledge or the sequence control panel through the clamping sleeve adapter. High-pressure hydrogen in the tube bundle vehicle flows through an air discharge hose and enters an air discharge column, and the high-pressure hydrogen sequentially flows through tube valve members such as a breaking valve, a one-way valve, an inlet stop valve, a filter, an outlet stop valve and the like to form a pipeline system, and then is discharged into a compressor sledge or a sequence control panel to complete one air discharge metering process.
In the related technology, manual valves in a hydrogen unloading system pipeline of the gas unloading column are numerous, the operation process is complicated, and the operation personnel have higher professional quality and operation experience requirements, so that the working efficiency is low and the safety is poor.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a hydrogen station gas unloading control method to solve the technical problems of complex structure, difficult operation, low safety and insufficient reliability of the existing gas unloading system.
In order to solve the technical problems, the invention adopts the following technical scheme:
designing a hydrogen discharge system, which comprises a hydrogen discharge main path, wherein the hydrogen discharge main path is sequentially connected with a breaking valve, a pressure gauge, a one-way valve, an inlet stop valve, a filter, an outlet stop valve and a pneumatic valve; the hydrogen unloading system further comprises a nitrogen purging branch, a diffusing branch, an instrument air inlet and a triple piece, pneumatic valves are arranged on the hydrogen unloading main circuit, the nitrogen purging branch and the diffusing branch, the triple piece is fixedly connected to the instrument air inlet, the triple piece is connected with the pneumatic valves through pipelines, and electromagnetic valves are arranged between the triple piece and the pneumatic valves.
Preferably, a pipeline at the joint of the pneumatic valve is provided with a bypass branch, and the bypass branch is respectively provided with a stop valve.
Preferably, two pressure transmitters are arranged on the nitrogen purging branch.
Preferably, the hydrogen unloading system further comprises a pressure overload protection branch and a sampling branch; the pressure overload protection branch is arranged on a main pipeline between the filter and the outlet stop valve, and the sampling branch is arranged on the nitrogen purging branch.
Preferably, the pressure overload protection branch mainly comprises a safety valve and a one-way valve, wherein the inlet end of the safety valve is communicated with the hydrogen discharge main circuit through a pipeline, and the outlet end of the safety valve is communicated with the one-way valve through a pipeline.
Preferably, the sampling branch mainly comprises a stop valve and a sampling port connector; one end of the stop valve is communicated with the nitrogen purging branch pipeline through a pipeline, and the other end of the stop valve is connected with a sampling container through the sampling port connector.
A hydrogen unloading control method for a hydrogen station is designed and implemented based on the hydrogen unloading system, and comprises the following steps:
s1, the nitrogen purging branch is connected with a nitrogen source pipeline, the diffusing branch is connected with a centralized diffusing pipeline, an instrument air inlet is connected with an instrument air source pipeline, a hydrogen inlet of an unloading hose is connected with an outlet of a tube bundle vehicle or other equipment, and a hydrogen unloading main pipeline outlet is connected with a sequence disk, so that an electromagnetic valve on the hydrogen unloading main pipeline and stop valves on bypass branches of the electromagnetic valve are ensured to be in a closed state;
s2, inputting a nitrogen purging signal, and when the pressure transmitter monitors that the pipeline pressure is less than 0.2MPa, sequentially opening pneumatic valves of the nitrogen purging branch and the diffusing branch, discharging nitrogen after flowing through each pipeline, and closing the pneumatic valves;
s3, repeating the operation of the step S2 for three times to complete nitrogen purging before hydrogen discharge;
s4, sequentially opening the inlet stop valve and the outlet stop valve, inputting a hydrogen discharge command signal, and opening a pneumatic valve on the hydrogen discharge main path to conduct the hydrogen discharge main path to start gas discharge;
s5, after hydrogen discharge is finished, closing a pneumatic valve on the hydrogen discharge main path, and stopping hydrogen discharge;
s6, inputting a nitrogen purging signal, wherein when the pressure in the pressure transmitter monitoring pipeline is not less than 0.2MPa, a pneumatic valve on the diffusing branch is opened, high-pressure hydrogen in the pipe is discharged into the concentrated diffusing pipeline, when the pressure in the pressure transmitter monitoring pipeline is not more than 0.2MPa, the pneumatic valve on the diffusing branch is closed, the pneumatic valve on the nitrogen purging branch is opened, and nitrogen enters the pipeline;
s7, when the pressure of the nitrogen in the pipeline reaches a set value, a pneumatic valve on the diffusing branch is opened, and the nitrogen in the pipeline enters the centralized diffusing pipeline;
s8, closing a pneumatic valve on the nitrogen purging branch, closing the pneumatic valve on the diffusing branch when the pressure of nitrogen in the monitoring pipe of the pressure transmitter is not more than 0.1MPa, and stopping nitrogen purging;
s9, repeating the steps S6-S8 for three times to complete the nitrogen purging work after hydrogen unloading;
and S10, closing the inlet stop valve and the outlet stop valve in sequence to finish one-time gas unloading operation.
Compared with the prior art, the invention has the main beneficial technical effects that:
1. the air discharging system is reasonable in structural configuration, simple and convenient to use and operate, easy to use, free of professional operation training of operators and good in universality.
2. The invention has high safety degree and good reliability, and can greatly improve the production efficiency while ensuring the operation safety.
Drawings
Fig. 1 is a schematic diagram of the gas circuit of the present invention.
FIG. 2 is a schematic structural diagram of a hydrogen discharge column system of a hydrogen filling station according to the present invention.
In the above drawings, 1 is a main hydrogen discharge path 1, 11 is a breaking valve, 12 is a pressure gauge, 13 is a first check valve, 14 is an inlet check valve, 15 is a filter, 16 is a flow meter, 17 is an outlet check valve, 18 is a first pneumatic valve, 2 is a nitrogen purge branch, 21 is a second pneumatic valve, 22 is a second check valve, 23 is a pressure transmitter, 3 is a relief branch, 31 is a third pneumatic valve, 32 is a third check valve, 4 is a pressure overload protection branch, 41 is a safety valve, 5 is a sampling branch, 51 is a manual check valve, 52 is a sampling connection joint, 6 is an instrument air inlet, 7 is a pneumatic triple, 8 is an electromagnetic valve, 81 is a first electromagnetic valve, 82 is a second electromagnetic valve, and 83 is a third electromagnetic valve.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
In the description of the technical solutions of the present invention, it should be understood that the orientations or positional relationships indicated as referring to the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Reference to "first," "second," and the like, in this application are used for distinguishing between similar elements and not necessarily for limiting the particular order or sequence in which the elements are arranged.
Example 1: a hydrogen unloading system is shown in figures 1-2 and comprises a hydrogen unloading main circuit 1, a nitrogen purging branch circuit 2, a diffusing branch circuit 3, a pressure overload protection branch circuit 4 and a sampling branch circuit 5, wherein all the branch circuits are sequentially communicated with the hydrogen unloading main circuit 1 through pipelines.
The hydrogen discharge main path 1 is sequentially connected with a breaking valve 11, a pressure gauge 12, a first one-way valve 13, an inlet stop valve 14, a filter 15, a flowmeter 16, an outlet stop valve 17 and a first pneumatic valve 18 from a hydrogen inlet to a hydrogen outlet; the snapping valve 11 is arranged between the hydrogen unloading inlet and the gas unloading equipment, a bidirectional check valve is arranged in the snapping valve, once the filling gun is pulled by certain external force, the snapping valve 11 can be automatically disconnected, and meanwhile, a pipeline is automatically closed and cut off, so that dangerous accidents are avoided; the first check valve 13 prevents the high-pressure gas (hydrogen/nitrogen) from reversely flowing and conducting during working, and prevents dangerous situations such as leakage of a large amount of hydrogen; the pressure gauge 12 is a high-precision oil-forbidden pressure gauge, the measuring range is 0-100MPa, the precision grade is plus or minus 0.1%, the filter 15 blocks particle impurities and dirt doped in the hydrogen, and discharges clean hydrogen, so that clean hydrogen is provided for the hydrogen energy valve comprehensive testing device, and the normal work and operation of pipe valves of a pipeline system are protected; the flow meter 16 can realize the real-time acquisition, processing and calculation of parameter information of hydrogen, such as flow, temperature, density and the like, so as to obtain the mass of hydrogen flowing through the flow meter 16; the first pneumatic valve 18 is a switching action of a double-acting cylinder, is driven to be executed by an execution air source, and is correspondingly matched with a first electromagnetic valve to control the opening and closing of the valve.
The nitrogen purging branch 2 is arranged on the hydrogen discharging main circuit 1 between the breaking valve 11 and the first one-way valve 13 and comprises a second pneumatic valve 21, a second one-way valve 22 and two pressure transmitters 23, preferably, the two pressure transmitters 23 are arranged to ensure that when one pressure transmitter 23 fails, the other pressure transmitter can quickly replace the function of the other pressure transmitter, and the whole hydrogen discharging process cannot be influenced; the bleeding branch 3 is arranged on the hydrogen discharging main path 1 between the first check valve 13 and the inlet stop valve 14, and comprises a third pneumatic valve 31 and a third check valve 32; the pressure overload protection branch circuit 4 is arranged on the hydrogen gas discharge main circuit 1 between the filter 15 and the outlet stop valve 17, and mainly comprises a safety valve 41, wherein the safety valve 41 is communicated with the hydrogen gas discharge main circuit through a pipeline inlet end, an outlet end is communicated with the third one-way valve 31 through a pipeline, pressure is relieved through a relief port of the relief branch circuit 3, when the pressure of hydrogen gas in the hydrogen gas discharge main circuit 1 is greater than or equal to a pressure value set by the safety valve, a valve of the safety valve 41 is automatically opened, high-pressure gas in the pipeline is discharged to a centralized relief pipeline through the third one-way valve 31, and when the pressure in the hydrogen gas discharge main circuit 1 is less than the pressure value set by the safety valve 41, the valve of the safety valve 41 is automatically closed.
The sampling branch 5 is arranged on the nitrogen purging branch 2 and the hydrogen discharging main path 1 communicating pipeline and comprises a manual stop valve 51 and a sampling connecting joint 52, when the hydrogen discharging main path 1 is filled with high-pressure hydrogen, the manual stop valve is opened, the hydrogen enters a sampling container connected with the sampling connecting joint 52 through the sampling branch 5, and the manual stop valve 51 is closed after sampling is completed.
The pipeline joints of the first pneumatic valve 18, the second pneumatic valve 21 and the third pneumatic valve 31 are provided with bypass branches, each bypass branch is provided with a manual stop valve, and the manual stop valves are manually opened or closed to ensure the normal operation of the hydrogen unloading process when the pneumatic valves cannot normally work.
The hydrogen gas discharging pipeline further comprises an instrument wind inlet 6, a pneumatic triple piece 7, a main pipeline on-off key (not shown in the figure), a nitrogen purging key (not shown in the figure) and an emergency stop key (not shown in the figure), wherein the pneumatic triple piece 7 is fixedly connected to the instrument wind inlet 6, the pneumatic triple piece 7 is respectively communicated with the first pneumatic valve 18, the second pneumatic valve 21 and the third pneumatic valve 31 through pipelines, a first electromagnetic valve 81 is arranged in a pipeline for communicating the pneumatic triple piece 7 with the first pneumatic valve 18, a second electromagnetic valve 82 is arranged in a pipeline for communicating the pneumatic valve 21 with the second pneumatic valve, and a third electromagnetic valve 83 is arranged in a pipeline for communicating the pneumatic valve 31 with the third pneumatic valve, the electromagnetic valve 8 is used for controlling the on-off of an instrument wind execution pipeline, so that the on-off of the pneumatic valve is controlled, and the triple piece 7 respectively provides a clean nitrogen gas source for the execution pipeline. Pressing the main path on-off button (not shown in the figure) opens the valve of the first pneumatic valve 18, and then pressing the main path on-off button (not shown in the figure) closes the valve of the first pneumatic valve 18; pressing a nitrogen purging button (not shown in the figure) to start nitrogen purging, and pressing the nitrogen purging button (not shown in the figure) to finish nitrogen purging; when the emergency stop button (not shown) is pressed, the first solenoid valve 81, the second solenoid valve 82, and the third solenoid valve 83 are simultaneously de-energized, and the first air-operated valve 18, the second air-operated valve 21, and the third air-operated valve 31 are controlled to be closed.
Example 2: a hydrogen unloading method is implemented based on the hydrogen unloading system in embodiment 1, and specifically comprises the following steps:
s1, a hydrogen inlet of the unloading hose is connected with an outlet of a tube bundle vehicle or other equipment, and a hydrogen outlet is connected with an inlet of a sequence control panel or other equipment; the outlet of the nitrogen source pipeline is connected with the nitrogen purging inlet; the diffusing port is connected with a centralized diffusing pipeline; the outlet of the instrument wind air source pipeline is connected with the inlet of the instrument wind, so that the valves of the first pneumatic valve 18 and the bypass branch manual stop valve are all in a closed state.
And S2, pressing a nitrogen purging key (not shown in the figure), starting the automatic nitrogen purging and replacing function, and when the pressure transmitter 23 monitors that the gas pressure in the pipeline is less than 0.2MPa, electrifying the second electromagnetic valve 82, and enabling the instrument wind and gas source to enter the second pneumatic valve 21 pneumatic actuating mechanism through the pneumatic triple piece 7. The second pneumatic valve is opened, nitrogen flows through the second one-way valve 22 to enter the hydrogen discharge main circuit 1, and then flows through the snapping valve 11 and the hydrogen inlet of the unloading hose; after the second electromagnetic valve 82 is electrified for 5 seconds, the third electromagnetic valve 83 is electrified, the instrument wind air source enters the third pneumatic valve 31 pneumatic actuating mechanism through the pneumatic triple piece 7, the third pneumatic valve 31 is opened, nitrogen flows through the hydrogen discharge main circuit 1 and the third one-way valve 32 and is discharged into the centralized diffusion pipeline system, at the moment, the nitrogen flows to the hydrogen inlet and the diffusion port simultaneously and is discharged, when the electrifying time of the second electromagnetic valve 82 and the third electromagnetic valve 83 is equal to the set time, the second electromagnetic valve and the third electromagnetic valve are powered off, the second pneumatic valve and the third pneumatic valve are closed, and the system stops nitrogen purging;
and S3, repeating the operation of the step S2 for three times, namely finishing the nitrogen purging and replacing operation of the air in the pipeline before the whole gas unloading.
S4, hydrogen enters the inlet end of the hydrogen discharge main pipeline 1 from the unloading outlet, and flows through the abruption valve 11, the pressure gauge 12 (the pressure gauge measures and displays the pressure value of the main pipeline in real time), the pressure transmitter 23 (the pressure transmitters PT101 and PT102 collect the pressure data of the main pipeline in real time and transmit the data to the background PLC control system, so that the pressure of the main pipeline can be monitored, recorded and fed back in real time), the first check valve 13 flows to the inlet stop valve 14, the inlet stop valve 14 and the outlet stop valve 17 are opened manually in sequence, the hydrogen flows through the inlet stop valve 14, the filter 15, the flowmeter 16 and the outlet stop valve 17 and flows to the first pneumatic valve 18, a key (not shown in the figure) of the main pipeline is pressed, the first solenoid valve 81 is powered on, the instrument wind gas source flows through the pneumatic triple 7 and enters the pneumatic actuating mechanism of the first pneumatic valve 18, and the valve of the first pneumatic valve 18 is opened, so that the hydrogen of the main pipeline is discharged out of the unloading system pipeline and flows into the next hydrogenation device to start unloading.
And S5, pressing a main pipeline on-off button (not shown in the figure), powering off the first electromagnetic valve 81, closing the valve of the first pneumatic valve 18, and stopping air discharge.
S6, a nitrogen purging button (not shown in the figure) is pressed, the nitrogen automatic purging replacement function is started, when the pressure transmitter 23 monitors that the gas pressure in the pipeline is not less than 0.2MPa, the third electromagnetic valve 83 is powered on, the instrument wind gas source flows through the pneumatic triple 7 and enters the pneumatic execution mechanism of the third pneumatic valve 31, the valve of the third pneumatic valve 31 is started, the high-pressure hydrogen in the pipeline is discharged into the centralized diffusion pipeline system through the third one-way valve 32, when the high-pressure hydrogen pressure in the pipeline is not more than 0.2MPa, the third electromagnetic valve 83 is powered off automatically, the valve of the third pneumatic valve 31 is closed, the high-pressure hydrogen in the pipeline stops diffusing, the second electromagnetic valve 82 is powered on, the instrument wind gas source passes through the pneumatic triple 7 and enters the pneumatic execution mechanism of the second pneumatic valve 21, the valve of the second pneumatic valve 21 is started, and the nitrogen flows through the second one-way valve 22 and enters the main pipeline.
And S7, when the pressure of the nitrogen in the pipeline is equal to 0.8MPa, the third electromagnetic valve 83 is electrified, and the instrument wind and gas source enters the third pneumatic valve 31 through the pneumatic triple piece 7. The third pneumatic valve 31 is opened and nitrogen flows through the third one-way valve 32, the diffusing port and into the centralized diffusing pipeline system.
And S8, when the power-on time of the second electromagnetic valve 82 is equal to the set time (10S), the second electromagnetic valve 82 is powered off, the second air-operated valve 21 is closed, the system stops nitrogen purging, when the pressure of nitrogen in the pipeline is not more than 0.1MPa, the third electromagnetic valve 83 is powered off, the third air-operated valve 31 is closed, and the system stops nitrogen purging.
S9, repeating the operations S6-S8 for three times, namely finishing the nitrogen purging work after hydrogen unloading;
and S10, manually closing the inlet stop valve 14 and the outlet stop valve 17 in sequence, correctly detaching a hydrogen inlet end connector of the unloading hose communicated with the tube bundle vehicle, and placing the unloading hose in situ to complete the sequential gas unloading operation.
While the invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes in the details of the embodiments may be made without departing from the spirit of the invention, and various changes in the details of construction and materials may be substituted for elements thereof to form various embodiments, which are within the scope of the invention and are not intended to be limited to the details of the embodiments.
Claims (1)
1. A hydrogen station gas unloading control method is characterized by comprising the following steps;
the hydrogen discharge system comprises a hydrogen discharge main path, wherein the hydrogen discharge main path comprises a breaking valve, a pressure gauge, a one-way valve, an inlet stop valve, a filter, an outlet stop valve and a pneumatic valve which are sequentially connected; the hydrogen unloading system also comprises a nitrogen purging branch, a diffusing branch, an instrument air inlet and a triplet piece; pneumatic valves are arranged in the hydrogen discharge main circuit, the nitrogen purging branch circuit and the diffusing branch circuit; the three-way part is respectively connected with the pneumatic valves through corresponding pipelines, and corresponding solenoid valves are arranged between the three-way part and each pneumatic valve; each pneumatic valve is respectively connected with a corresponding bypass branch in parallel, and each bypass branch is respectively provided with a corresponding stop valve;
two pressure transmitters are arranged in the nitrogen purging branch; the hydrogen unloading system also comprises a pressure overload protection branch and a sampling branch; the pressure overload protection branch is arranged in a main pipeline between the filter and the outlet stop valve, and the sampling branch is arranged in the nitrogen purging branch; the pressure overload protection branch mainly comprises a safety valve and a one-way valve, wherein the inlet end of the safety valve is communicated with the hydrogen discharge main circuit through a pipeline, and the outlet end of the safety valve is communicated with the one-way valve through a pipeline; the sampling branch mainly comprises a stop valve and a sampling port connecting joint; one end of the stop valve is communicated with the nitrogen purging branch pipeline through a pipeline, and the other end of the stop valve is connected with a sampling container through the sampling port connecting joint;
s1, the nitrogen purging branch is connected with a nitrogen source pipeline, the diffusing branch is connected with a centralized diffusing pipeline, an instrument air inlet is connected with an instrument air source pipeline, a hydrogen inlet of an unloading hose is connected with an outlet of a tube bundle vehicle or other equipment, and a hydrogen unloading main pipeline outlet is connected with a sequence disk, so that an electromagnetic valve on the hydrogen unloading main pipeline and stop valves on bypass branches of the electromagnetic valve are ensured to be in a closed state;
s2, inputting a nitrogen purging signal, and when the pressure transmitter monitors that the pipeline pressure is less than 0.2MPa, sequentially opening the nitrogen purging branch, the electromagnetic valve of the bleeding branch and the pneumatic valve, discharging the nitrogen after flowing through each pipeline, and closing the electromagnetic valve and the pneumatic valve;
s3, repeating the operation of the step S2 for three times to complete nitrogen purging before hydrogen discharge;
s4, opening the inlet stop valve and the outlet stop valve in sequence, inputting a hydrogen discharge command signal, and opening an electromagnetic valve and a pneumatic valve on the hydrogen discharge main circuit to enable the hydrogen discharge main circuit to be conducted to start gas discharge;
s5, after hydrogen discharge is finished, closing a pneumatic valve on the hydrogen discharge main circuit, and stopping hydrogen discharge;
s6, inputting a nitrogen purging signal, wherein when the pressure in the pipeline is monitored by the pressure transmitter to be not less than 0.2MPa, a pneumatic valve on the diffusing branch is opened, high-pressure hydrogen in the pipeline is discharged into the centralized diffusing pipeline, when the pressure in the pipeline is monitored by the pressure transmitter to be not more than 0.2MPa, the pneumatic valve on the diffusing branch is closed, the pneumatic valve on the nitrogen purging branch is opened, and nitrogen enters the pipeline;
s7, when the pressure of the nitrogen in the pipeline reaches a set value, a pneumatic valve on the diffusing branch is opened, and the nitrogen in the pipeline enters the concentrated diffusing pipeline;
s8, closing a pneumatic valve on the nitrogen purging branch, closing the pneumatic valve on the diffusing branch when the pressure of nitrogen in the pressure transmitter monitoring pipe is not more than 0.1MPa, and stopping nitrogen purging;
s9, repeating the steps S6-S8 for three times, and finishing nitrogen purging after hydrogen unloading;
and S10, sequentially closing the inlet stop valve and the outlet stop valve to finish one-time gas unloading operation.
Priority Applications (1)
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| CN114413169B (en) * | 2021-12-25 | 2023-12-22 | 安徽明天氢能科技股份有限公司 | Nitrogen control pipeline system for hydrogenation station |
| CN114893714B (en) * | 2022-04-24 | 2023-11-21 | 正星氢电科技郑州有限公司 | Single-metering 35MPa and 70MPa double-gun hydrogen filling system and control method thereof |
| CN115681827A (en) * | 2022-09-01 | 2023-02-03 | 核工业西南物理研究院 | Device for replacing and flushing interlayer gas of charging valve box |
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| JP2928238B1 (en) * | 1998-07-28 | 1999-08-03 | 山形日本電気株式会社 | Gas supply device and gas supply method |
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