CN113623537A - Hydrogen discharging system and control method - Google Patents

Hydrogen discharging system and control method Download PDF

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Publication number
CN113623537A
CN113623537A CN202110930822.XA CN202110930822A CN113623537A CN 113623537 A CN113623537 A CN 113623537A CN 202110930822 A CN202110930822 A CN 202110930822A CN 113623537 A CN113623537 A CN 113623537A
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China
Prior art keywords
valve
hydrogen
branch
pipeline
pneumatic
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CN202110930822.XA
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Chinese (zh)
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CN113623537B (en
Inventor
周亮
李明昕
贾艳明
黄景龙
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Zhengxing Hydrogen Electric Technology Zhengzhou Co ltd
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Zhengxing Hydrogen Electric Technology Zhengzhou Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS 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
    • F17C7/00Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00Pipe-line systems
    • F17D1/02Pipe-line systems for gases or vapours
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00Arrangements for supervising or controlling working operations
    • F17D3/01Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00Arrangements for supervising or controlling working operations
    • F17D3/18Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00Protection or supervision of installations
    • F17D5/005Protection or supervision of installations of gas pipelines, e.g. alarm
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING 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
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS 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
    • F17C2221/00Handled fluid, in particular type of fluid
    • F17C2221/01Pure fluids
    • F17C2221/012Hydrogen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS 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
    • F17C2223/00Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107Single phase
    • F17C2223/0123Single phase gaseous, e.g. CNG, GNC
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/32Hydrogen storage
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/34Hydrogen distribution
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/45Hydrogen 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

Hydrogen discharging system and control method
Technical Field
The invention relates to the technical field of new energy equipment, in particular to a hydrogen unloading system and a 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 and transported to the hydrogen station from the hydrogen production station by the pipe transport vehicle, the high-pressure hydrogen in the pipe transport vehicle needs to be discharged into the hydrogen storage tank of the hydrogen station by using the gas discharge column, and the gas discharge column plays the role of hydrogen discharge equipment at the moment. 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 hydrogen unloading system pipelines 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 unloading system and a control method thereof, and aims to solve the technical problems of complex structure, difficult operation, low safety and insufficient reliability of the conventional 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 the 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 port branch is connected with a centralized diffusing pipeline, the instrument air inlet is connected with an instrument air source pipeline, the hydrogen inlet of the unloading hose is connected with the outlet of a tube bundle vehicle or other equipment, and the outlet of the hydrogen discharging main circuit is connected with a sequence disk, so that the electromagnetic valve on the hydrogen discharging main circuit and the stop valves on the bypass branches thereof are ensured to be in a closed state;
s2, inputting a nitrogen purging signal, wherein when the pressure transmitter monitors that the pipeline pressure is less than 0.2MPa, pneumatic valves of the nitrogen purging branch and the diffusing branch are sequentially opened, nitrogen flows through each pipeline and then is discharged, and the pneumatic valves are closed;
s3, repeating the operation of S2 for three times to complete the nitrogen purging before hydrogen unloading;
s4, opening the inlet stop valve and the outlet stop valve in sequence, inputting a hydrogen discharge command signal, opening a pneumatic valve on the hydrogen discharge main path, conducting the hydrogen discharge main path and starting to discharge gas;
s5, after hydrogen discharge is completed, closing the 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, the 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, the pneumatic valve on the diffusing branch is opened, and the nitrogen in the pipeline enters the concentrated diffusing pipeline;
s8, closing the pneumatic valve on the nitrogen purging branch, closing the pneumatic valve on the bleeding branch when the pressure of the nitrogen in the pressure transmitter monitoring pipe is not more than 0.1MPa, and stopping purging the nitrogen;
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 discharge system is reasonable in structural configuration, simple and convenient to use and operate, easy to use, free of professional operation training on 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 herein to "first," "second," etc., is used to distinguish between similar items and not to limit the particular order or sequence.
Example 1: a hydrogen unloading system, see fig. 1 to 2, 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 each branch circuit is sequentially communicated with the hydrogen unloading main circuit 1 through a pipeline.
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 a certain external force, the snapping valve 11 can be automatically broken, 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 mixed in hydrogen, and discharges clean hydrogen, so that clean hydrogen is provided for the hydrogen energy valve comprehensive testing device, and 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 connecting parts of the first pneumatic valve 18, the second pneumatic valve 21 and the third pneumatic valve 31 are provided with bypass branches, the bypass branches are provided with manual stop valves, and the manual stop valves are manually opened or closed to ensure the normal operation of the hydrogen unloading process in the state that the pneumatic valves cannot normally work.
The hydrogen gas discharging pipeline also comprises an instrument air inlet 6, a pneumatic triple piece 7, a main pipeline on-off button (not shown in the figure), a nitrogen purging button (not shown in the figure) and an emergency stop button (not shown in the figure), the pneumatic triplet 7 is fixedly connected to the instrument wind inlet 6, the pneumatic triplet 7 is respectively communicated with the first pneumatic valve 18, the second pneumatic valve 21 and the third pneumatic valve 31 through pipelines, and a first solenoid valve 81 is arranged in a pipeline for communicating the pneumatic triplet 7 with the first pneumatic valve 18, a second solenoid valve 82 is arranged in a pipeline for communicating the pneumatic triplet with the second pneumatic valve 21, a third solenoid valve 83 is arranged in a pipeline for communicating the pneumatic triplet with the third pneumatic valve 31, the solenoid valve 8 is used for controlling the on-off of an instrument wind execution pipeline, thereby controlling the opening and closing of the pneumatic valve, and the pneumatic triple piece 7 respectively provides a clean nitrogen gas source for the execution pipeline for the pneumatic valve. 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 key (not shown in the figure), starting nitrogen purging, and pressing the nitrogen purging key (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, thereby controlling the first air-operated valve 18, the second air-operated valve 21, and the third air-operated valve 31 to close.
Example 2: a hydrogen unloading method is implemented based on the hydrogen unloading system in embodiment 1, and specifically comprises the following steps:
s1, connecting the hydrogen inlet of the unloading hose with the outlet of the tube bundle vehicle or other equipment, and connecting the hydrogen outlet with the inlet of the 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.
S2, pressing a nitrogen purging button (not shown in the figure), starting the nitrogen automatic purging and replacing function, 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 gas source to enter the second pneumatic valve 21 through the pneumatic triple 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 breaking 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, an instrument air source enters a pneumatic actuating mechanism of the third pneumatic valve 31 through the pneumatic triple piece 7, the valve of 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 a centralized diffusion pipeline system, at the moment, 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 electromagnetic valve and the third electromagnetic valve are closed, and the system stops nitrogen purging;
and S3, repeating the operation of S2 three times, namely, completing the nitrogen purging replacement operation of the air in the pipeline before the whole gas unloading.
S4, hydrogen enters the inlet end of the hydrogen discharge main circuit 1 from the unloading outlet, passes 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 in sequence, the hydrogen flows through the inlet stop valve 14, the filter 15, the flowmeter 16 and the outlet stop valve 17 to the first pneumatic valve 18, a key (not shown in the figure) of the main pipeline is pressed, the first electromagnetic valve 81 is powered on, the instrument air source flows through the pneumatic triplet 7 to enter the pneumatic actuator of the first pneumatic valve 18, the valve 18 is opened, so that the hydrogen in the main pipeline is discharged out of the unloading system pipeline, and (4) flowing into the next hydrogenation equipment, and starting gas discharge.
S5, the main pipeline on-off button (not shown) is pressed, the first solenoid valve 81 is de-energized, the first pneumatic valve 18 is closed, and the air discharge is stopped.
S6, pressing a nitrogen purge button (not shown), the nitrogen automatic purge replacement function is turned on, when the pressure transmitter 23 monitors that the gas pressure in the pipeline is not less than 0.2MPa, the third solenoid valve 83 is powered on, the instrument air source flows through the pneumatic triple 7 and enters the pneumatic actuator of the third pneumatic valve 31, the valve of the third pneumatic valve 31 is turned on, the high-pressure hydrogen in the pipeline is discharged into the centralized diffusion pipeline system through the third one-way valve 32, when the pressure of the high-pressure hydrogen in the pipeline is not more than 0.2MPa, the third solenoid valve 83 is powered off automatically, the valve of the third pneumatic valve 31 is turned off, the high-pressure hydrogen in the pipeline stops diffusing, the second solenoid valve 82 is powered on, the instrument air source passes through the pneumatic triple 7 and enters the pneumatic actuator of the second pneumatic valve 21, the valve of the second pneumatic valve 21 is turned on, 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 electrifying 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 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 the hydrogen inlet end joint of the unloading hose communicated with the tube bundle vehicle, and completing the sequential gas unloading operation after the unloading hose is placed in the original position.
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 (6)

1. A 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 is characterized by further comprising 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; and each pneumatic valve is respectively connected with a corresponding bypass branch in parallel, and each bypass branch is provided with a corresponding stop valve.
2. A hydrogen offloading system as recited in claim 1, wherein two pressure transducers are provided in the nitrogen purge branch.
3. The hydrogen offloading system of claim 1, further comprising 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.
4. The hydrogen discharge system of claim 4, wherein the pressure overload protection branch circuit mainly comprises a safety valve and a one-way valve, wherein the inlet end of the safety valve is communicated with the main hydrogen discharge path through a pipeline, and the outlet end of the safety valve is communicated with the one-way valve through a pipeline.
5. The hydrogen unloading system as recited in claim 4, wherein the sampling branch mainly comprises a stop valve and a sampling port connection 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 the sampling container through the sampling port connecting joint.
6. A hydrogen unloading control method for a hydrogen station, which is implemented based on the hydrogen unloading system of claim 1, and comprises the following steps;
s1, the nitrogen purging branch is connected with a nitrogen source pipeline, the diffusing port branch is connected with a centralized diffusing pipeline, the instrument air inlet is connected with an instrument air source pipeline, the hydrogen inlet of the unloading hose is connected with the outlet of a tube bundle vehicle or other equipment, and the outlet of the hydrogen discharging main circuit is connected with a sequence disk, so that the electromagnetic valve on the hydrogen discharging main circuit and the stop valves on the bypass branches thereof are ensured to be in a closed state;
s2, inputting a nitrogen purging signal, wherein when the pressure transmitter monitors that the pipeline pressure is less than 0.2MPa, the nitrogen purging branch, the electromagnetic valve of the bleeding branch and the pneumatic valve are sequentially opened, nitrogen flows through each pipeline and is discharged, and the electromagnetic valve and the pneumatic valve are closed;
s3, repeating the operation of S2 for three times to complete the nitrogen purging before hydrogen unloading;
s4, opening the inlet stop valve and the outlet stop valve in sequence, inputting a hydrogen discharge command signal, and opening the electromagnetic valve and the pneumatic valve on the hydrogen discharge main path to conduct the hydrogen discharge main path and start gas discharge;
s5, after hydrogen discharge is completed, closing the 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, the pneumatic valve on the diffusing branch is opened, and the nitrogen in the pipeline enters the concentrated diffusing pipeline;
s8, closing the pneumatic valve on the nitrogen purging branch, closing the pneumatic valve on the bleeding branch when the pressure of the nitrogen in the pressure transmitter monitoring pipe is not more than 0.1MPa, and stopping purging the nitrogen;
s9, repeating the steps S6-S8 for three times, and finishing nitrogen purging after hydrogen unloading;
and S10, closing the inlet stop valve and the outlet stop valve in sequence to finish one-time gas unloading operation.
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CN114893714A (en) * 2022-04-24 2022-08-12 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
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