CN111541299A - Self-powered system of natural gas hydrogen-mixing gas mixing station and control method thereof - Google Patents
Self-powered system of natural gas hydrogen-mixing gas mixing station and control method thereof Download PDFInfo
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- CN111541299A CN111541299A CN202010490815.8A CN202010490815A CN111541299A CN 111541299 A CN111541299 A CN 111541299A CN 202010490815 A CN202010490815 A CN 202010490815A CN 111541299 A CN111541299 A CN 111541299A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/30—The power source being a fuel cell
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention relates to a self-powered system of a natural gas hydrogen-mixing gas mixing station and a control method thereof, wherein the system comprises a natural gas hydrogen-mixing gas mixing device, differential pressure power generation equipment, a PEM hydrogen fuel cell, a gas pressure regulator, a power supply control device and a power supply device; the natural gas is conveyed to a differential pressure power generation device/a fuel gas pressure regulator through an incoming gas main pipeline, a first incoming gas branch pipeline/a second incoming gas branch pipeline in sequence, and the natural gas output by the differential pressure power generation device/the fuel gas pressure regulator is conveyed to a natural gas hydrogen-mixing gas mixing device through a first outgoing gas branch pipeline/a second outgoing gas branch pipeline and an outgoing gas main pipeline in sequence; hydrogen is conveyed to a natural gas-hydrogen mixing device/PEM hydrogen fuel cell through a hydrogen main pipeline, a first hydrogen branch pipeline/a second hydrogen branch pipeline in sequence; the pressure difference power generation equipment and the PEM hydrogen fuel cell are both connected with the power supply control device and the power supply device; the power supply device is connected with the natural gas hydrogen-mixing gas mixing device. The invention can realize self power supply and reduce power supply cost.
Description
Technical Field
The invention relates to the technical field of natural gas hydrogen mixing, in particular to a self-powered system of a natural gas hydrogen mixing station and a control method thereof.
Background
In recent years, natural gas and renewable energy in China are rapidly developed, and large-scale application of the natural gas and renewable energy makes outstanding contribution to cleanness and low carbon of energy utilization in China. However, with the rapid development and large-scale application of natural gas and renewable energy, the shortage of natural gas resources and the consumption of renewable energy become serious challenges facing the current energy industry. Data shows that the dependence of natural gas in China on the outside reaches 45% in 2018, and the electricity quantity of 'wind, light and water abandonment' is about 1023 hundred million kilowatts, which exceeds the electricity generation quantity of the three gorges power station in the same period. In the face of an urgent energy situation, the natural gas hydrogen-loading technology can become an effective way for solving the challenges of natural gas and renewable energy.
The natural gas hydrogen mixing technology is that renewable energy which cannot be consumed by a power grid is used for electrolyzing water to prepare hydrogen, the hydrogen is injected into a natural gas pipeline and mixed with natural gas to form hydrogen mixed natural gas, the hydrogen mixed natural gas is conveyed to a terminal through the natural gas pipeline, and the hydrogen mixed natural gas is applied at the terminal, so that systematic application of hydrogen production, hydrogen mixing, hydrogen conveying and hydrogen utilization is formed. The natural gas hydrogen-doping technology can improve the utilization rate of renewable energy sources, is favorable for solving the problem of 'wind abandoning, light abandoning and water abandoning' in China, realizes partial replacement of natural gas by hydrogen, and is favorable for reducing the external dependence of natural gas in China. Besides, the doped natural gas can reduce pollutants generated by terminal combustion, and is beneficial to solving the problems of urban haze, acid rain and the like. Therefore, the application of the natural gas hydrogen-loading technology is one of the important directions for the development of the future natural gas industry.
The natural gas hydrogen-mixing gas mixing station is one of the key technologies in the natural gas hydrogen-mixing technology, and the main equipment of the natural gas hydrogen-mixing gas mixing station is a natural gas hydrogen-mixing device which can be generally installed in a natural gas valve station and a natural gas pressure regulating tank. If the natural gas hydrogen-mixing gas mixing device is connected to the commercial power to supply power, hundreds of thousands or even millions of commercial power expenses can be generated by combining the commercial power price and the power supply power, so that the power supply cost of the natural gas hydrogen-mixing gas mixing device is increased undoubtedly, and the popularization and the application of the natural gas hydrogen-mixing gas mixing station are restricted. Therefore, how to reduce the power supply cost of the natural gas hydrogen-loading gas mixing device is an urgent problem to be solved in the current natural gas hydrogen-loading gas mixing station.
Disclosure of Invention
The invention aims to provide a self-powered system of a natural gas hydrogen-mixing gas station, which has the characteristics of realizing self-power supply of a natural gas hydrogen-mixing gas device and reducing the power supply cost of the natural gas hydrogen-mixing gas device.
The above object of the present invention is achieved by the following technical solutions:
a self-powered system for a natural gas blending station, comprising: the system comprises a natural gas hydrogen-mixing gas mixing device, a differential pressure power generation device, a PEM hydrogen fuel cell, a fuel gas pressure regulator, a power supply control device and a power supply device;
the natural gas at the upstream is conveyed to the differential pressure power generation equipment through a main gas inlet pipeline and a first gas inlet branch pipeline in sequence, and the natural gas output by the differential pressure power generation equipment is conveyed to the natural gas hydrogen-mixing device through a first gas outlet branch pipeline and a main gas outlet pipeline in sequence;
the upstream natural gas is conveyed to the gas pressure regulator through the main gas inlet pipeline and the second gas inlet branch pipeline in sequence, and the natural gas output by the gas pressure regulator is conveyed to the natural gas hydrogen-mixing device through the second gas outlet branch pipeline and the main gas outlet pipeline in sequence;
the differential pressure power generation equipment is provided with a first control end and a first electric energy output end, wherein the first control end is connected with the electric power supply control device, and the first electric energy output end is connected with the power supply device;
hydrogen is conveyed to the natural gas and hydrogen-blended gas mixing device through a hydrogen main pipeline and a first hydrogen branch pipeline in sequence; hydrogen is conveyed to the PEM hydrogen fuel cell through the hydrogen main pipeline and the second hydrogen branch pipeline in sequence;
the PEM hydrogen fuel cell is provided with a second control end and a second electric energy output end, wherein the second control end is connected with the electric power supply control device, and the second electric energy output end is connected with the power supply device;
the power supply control device is used for carrying out scheduling control on the pressure difference power generation equipment and the PEM hydrogen fuel cell; the power supply device is connected with the natural gas hydrogen-mixing gas mixing device and is used for storing electric energy and providing the electric energy for the natural gas hydrogen-mixing gas mixing device; the natural gas hydrogen-mixing gas mixing device outputs hydrogen-mixing natural gas through a downstream natural gas pipeline.
By adopting the technical scheme, the pressure energy of the natural gas is converted into the electric energy by utilizing the pressure difference power generation equipment, the PEM hydrogen fuel cell is controlled to generate electricity by utilizing the hydrogen, the self-power supply of the natural gas-doped gas mixing device can be realized, the commercial power does not need to be accessed, the power supply cost is reduced, and the popularization and the application of the natural gas-doped gas mixing station are facilitated.
The present invention in a preferred example may be further configured to: the main gas supply pipeline is provided with a pressure gauge for measuring the pressure of the natural gas and sending the pressure to the power supply control device; and/or
The main gas supply pipeline is provided with a flowmeter and used for measuring the flow rate of natural gas incoming gas and sending the flow rate to the power supply control device; and/or
And the second hydrogen branch pipeline is provided with a pressure gauge for measuring the pressure intensity of hydrogen coming from the hydrogen supply branch pipeline and sending the pressure intensity to the power supply control device.
By adopting the technical scheme, the pressure gauge and the flow meter are arranged to respectively collect the natural gas pressure and the incoming gas flow so as to judge whether the pressure difference power generation equipment reaches the operating condition, and the pressure gauge is arranged to collect the hydrogen pressure so as to judge whether the PEM hydrogen fuel cell reaches the operating condition.
The present invention in a preferred example may be further configured to: still including locating hydrogen trunk line, first hydrogen branch pipeline, the hydrogen buffer tank of second hydrogen branch pipeline intersection, be equipped with first hydrogen air inlet, first hydrogen gas outlet and second hydrogen gas outlet on the hydrogen buffer tank, first hydrogen gas inlet is connected the hydrogen trunk line, first hydrogen gas outlet passes through second hydrogen branch pipeline connects PEM hydrogen fuel cell, the second hydrogen gas outlet passes through first hydrogen branch pipeline connects the natural gas mixes the hydrogen gas device of mixing.
Through adopting above-mentioned technical scheme, the pressure adjustment is realized through compressing inside air to the hydrogen buffer tank, can the buffer system pressure fluctuation, eliminate water hammer, steady voltage off-load, is applicable to the unstable condition of upstream hydrogen supply.
The present invention in a preferred example may be further configured to: the power supply device includes:
the energy storage module is used for storing the electric energy output by the pressure difference power generation equipment or the PEM hydrogen fuel cell; and
and the pressure regulating and rectifying module is connected with the energy storage module and is used for outputting the electric energy stored by the energy storage module to the natural gas and hydrogen mixing device after pressure regulating and rectifying.
By adopting the technical scheme, the electric energy output by the differential pressure power generation equipment and the PEM hydrogen fuel cell is converged into the energy storage module for storage, and then the stored electric energy is subjected to voltage regulation and rectification and then enters the natural gas and hydrogen-doped gas mixing device to provide stable power supply voltage for the natural gas and hydrogen-doped gas mixing device.
The present invention in a preferred example may be further configured to: the pipeline comprises a main gas outlet pipeline and a bypass pipeline, wherein the main gas outlet pipeline is communicated with a downstream natural gas pipeline.
By adopting the technical scheme, the by-pass structure can realize the hydrogen-loading process of partial station-passing natural gas, and is suitable for the demonstration application of natural gas hydrogen-loading mixed gas of large-scale pressure regulating stations.
The present invention in a preferred example may be further configured to: the device also comprises an alarm device connected with the power supply control device and used for sending out an alarm signal when the PEM hydrogen fuel cell and the differential pressure power generation equipment do not reach the operating condition.
By adopting the technical scheme, when the PEM hydrogen fuel cell and the differential pressure power generation equipment do not reach the operating conditions, the power supply control device controls the alarm device to send out an alarm signal to the operator, so that the operator can solve the problem as soon as possible, the normal power supply function is recovered, and the normal operation of the natural gas and hydrogen mixed gas device is ensured.
The invention also aims to provide a control method of the self-powered system for the natural gas hydrogen-doped gas mixing station, which can carry out scheduling control on the self-powered system and ensure the normal operation of the self-powered system.
The second aim of the invention is realized by the following technical scheme:
a control method for an autonomous power supply system of a natural gas hydrogen-loading gas mixing plant as described above, comprising:
when the power supply control device judges that the hydrogen pressure measured by the pressure gauge is lower than a first preset value and the incoming flow rate of the natural gas measured by the flow meter is higher than a second preset value, the power supply control device switches to the pressure difference power generation equipment to operate to supply power to the natural gas-hydrogen-mixed gas device; or if the power supply control device judges that the hydrogen pressure measured by the pressure gauge is lower than a first preset value and the natural gas incoming pressure measured by the pressure gauge is not lower than the required pressure lower limit of the differential pressure power generation equipment, switching to the differential pressure power generation equipment to operate to supply power to the natural gas and hydrogen mixing device;
and currently supplying power to the pressure difference power generation equipment, if the power supply control device judges that the hydrogen pressure measured by the pressure gauge is not lower than the first preset value, the flow rate of the natural gas incoming flow measured by the flow meter is not higher than the second preset value, and the pressure of the natural gas incoming flow measured by the pressure gauge is lower than the lower limit of the required pressure of the pressure difference power generation equipment, switching to the PEM hydrogen fuel cell to operate to supply power to the natural gas hydrogen-doped gas mixing device.
By adopting the technical scheme, whether the pressure difference power generation equipment reaches the operation condition or not is judged according to the pressure of the natural gas incoming air and the incoming air flow which are respectively collected by the pressure gauge and the flow meter, whether the PEM hydrogen fuel cell reaches the operation condition or not is judged according to the pressure intensity of the hydrogen incoming air which is collected by the pressure gauge, when one of the pressure difference power generation equipment and the PEM hydrogen fuel cell cannot reach the operation condition, the other one of the pressure difference power generation equipment and the PEM hydrogen fuel cell is controlled to operate to supply power to the natural gas hydrogen-doped gas mixing device, the effective dispatching control of the self-power supply system of the natural gas hydrogen-doped gas mixing station can be realized, the normal operation of the.
The present invention in a preferred example may be further configured to: further comprising:
if the power supply control device judges that the hydrogen pressure measured by the pressure gauge is lower than a first preset value, the flow rate of the natural gas incoming flow measured by the flow meter is not higher than a second preset value, and the pressure of the natural gas incoming flow measured by the pressure gauge is lower than the lower limit of the required pressure of the differential pressure power generation equipment, the electric energy stored by the power supply device is used as the natural gas blending device, and the alarm device is controlled to send an alarm signal.
By adopting the technical scheme, when the PEM hydrogen fuel cell and the differential pressure power generation equipment do not reach the operating conditions, the power supply control device controls the alarm device to send out an alarm signal to the operator, so that the operator can solve the problem as soon as possible, the normal power supply function is recovered, and the normal operation of the natural gas and hydrogen mixed gas device is ensured.
The present invention in a preferred example may be further configured to: the first preset value is 0.2 MPa.
By adopting the technical scheme, when the coming gas pressure of the hydrogen of the PEM hydrogen fuel cell reaches 0.2MPa, the PEM hydrogen fuel cell can normally operate and has high efficiency.
The present invention in a preferred example may be further configured to: the second preset value is 50% of the rated flow of the pressure power generation equipment.
By adopting the technical scheme, when the natural gas incoming flow exceeds 50% of the rated flow of the pressure power generation equipment, the normal operation of the pressure power generation equipment can be ensured, and the efficiency is high.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the pressure difference power generation equipment is utilized to convert the pressure energy of the natural gas into electric energy, the PEM hydrogen fuel cell is controlled to generate electricity by utilizing hydrogen, self-power supply of the natural gas-doped gas mixing device can be realized, the mains supply is not required to be connected, the power supply cost is reduced, and the popularization and the application of a natural gas-doped gas mixing station are facilitated;
2. whether the pressure difference power generation equipment reaches the operation condition or not is judged according to the pressure of the natural gas incoming air and the flow rate of the incoming air which are respectively collected by the pressure gauge and the flow meter, whether the PEM hydrogen fuel cell reaches the operation condition or not is judged according to the pressure intensity of the hydrogen incoming air which is collected by the pressure gauge, when one of the pressure difference power generation equipment and the PEM hydrogen fuel cell cannot reach the operation condition, the other one of the pressure difference power generation equipment and the PEM hydrogen fuel cell is controlled to operate to supply power to the natural gas hydrogen-mixing gas mixing device, effective dispatching control over an automatic power supply system of a natural gas hydrogen-mixing gas station can be achieved, normal operation of the automatic.
Drawings
Fig. 1 is a block diagram of a system configuration according to a first embodiment of the present invention.
Fig. 2 is a block diagram of a system configuration according to a second embodiment of the present invention.
Fig. 3 is a schematic flow chart of a method for switching a PEM hydrogen fuel cell to a pressure difference power generation device to generate power in the third embodiment of the invention.
Fig. 4 is a schematic flow chart of a method for switching to PEM hydrogen fuel cell power generation from a differential pressure power generation device in the third embodiment of the invention.
In the figure, 1, a natural gas hydrogen-mixing gas mixing device, 2, a differential pressure power generation device, 3, a PEM hydrogen fuel cell, 4, a gas pressure regulator, 5, a power supply control device, 6, a power supply device, 61, an energy storage module, 62, a voltage regulation rectification module, 7, a main gas inlet pipeline, 8, a first gas inlet branch pipeline, 9, a first gas outlet branch pipeline, 10, a main gas outlet pipeline, 11, a second gas inlet branch pipeline, 12, a second gas outlet branch pipeline, 13, a hydrogen main pipeline, 14, a first hydrogen branch pipeline, 15, a second hydrogen branch pipeline, 16, a downstream natural gas pipeline, 17, a pressure gauge, 18, a flow meter, 19, a pressure gauge, 20, a hydrogen tank, 21, a bypass pipeline, 22, an alarm device, 23, a communication control module, 24 and an upper buffer monitoring system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example one
Fig. 1 is a block diagram of a self-powered system of a natural gas hydrogen-loading gas mixing station according to an embodiment of the present invention. Referring to fig. 1, the system includes a natural gas hydrogen-loading gas mixing device 1, a pressure difference power generation device 2, a PEM hydrogen fuel cell 3, a fuel gas pressure regulator 4, a power supply control device 5 and a power supply device 6.
As shown in fig. 1, the upstream natural gas firstly enters a main gas inlet pipeline 7 and then is divided into two paths, one path is conveyed to the differential pressure power generation equipment 2 through a first gas inlet branch pipeline 8, and the other path is conveyed to the gas pressure regulator 4 through a second gas inlet branch pipeline 11; the natural gas output from the differential pressure power generation equipment 2 and the gas pressure regulator 4 is respectively converged into the main gas outlet pipeline 10 through the first gas outlet branch pipeline 9 and the second gas outlet branch pipeline 12, and is conveyed to the natural gas hydrogen-mixing gas mixing device 1 through the main gas outlet pipeline 10.
As shown in fig. 1, hydrogen provided by the hydrogen source firstly enters a hydrogen main pipe 13, and then is divided into two paths, one path is delivered to the natural gas hydrogen-loading gas mixing device 1 through a first hydrogen branch pipe 14, and the other path is delivered to the PEM hydrogen fuel cell 3 through a second hydrogen branch pipe 15. The hydrogen source can be an on-site hydrogen tanker, an on-site hydrogen production device or hydrogen delivered through an upstream hydrogen pipeline.
As shown in fig. 1, the differential pressure power generation device 2 is provided with a first control end and a first power output end, wherein the first control end is connected with the power supply control device 5, and the first power output end is connected with the power supply device 6; the PEM hydrogen fuel cell 3 is provided with a second control end and a second electric energy output end, wherein the second control end is connected with the electric power supply control device 5, and the second electric energy output end is connected with the power supply device 6; the power supply control device 5 is used for scheduling and controlling the pressure difference power generation equipment 2 and the PEM hydrogen fuel cell 3; the power supply device 6 is connected with the natural gas hydrogen-mixing gas mixing device 1 and is used for storing electric energy and providing the electric energy for the natural gas hydrogen-mixing gas mixing device 1; the natural gas loading and mixing device 1 outputs the loading natural gas through a downstream natural gas pipeline 16.
In the embodiment, the differential pressure power generation equipment 2 comprises an expander and a generator, the mechanical energy output end of the expander is connected with a rotor of the generator, the differential pressure power generation power is 5-100 kW, and the pressure and the flow need to be designed according to a specifically used station. The power generation is carried out in a gas direct expansion mode, namely, the high-pressure natural gas of the pipeline is compressed, the volume expansion generates considerable energy, the generated energy is utilized for power generation, and the pressure energy of the natural gas is converted into electric energy.
At present, the differential pressure power generation equipment 2 cannot process all natural gas incoming from a natural gas valve station and a natural gas pressure regulating tank, and therefore, a gas pressure regulator 4 needs to be arranged to assist in processing a part of natural gas incoming. The gas outlet of the differential pressure power generation equipment 2 is provided with a flow regulating valve, the outlet pressure of the differential pressure power generation equipment 2 is compared with the outlet pressure of the gas pressure regulator 4, and the distribution of two paths of natural gas flow is regulated by regulating the outlet pressure.
In the embodiment, the PEM hydrogen fuel cell 3 generates electricity by using hydrogen, the emission is only water vapor, the carbon emission is low, the noise is low, the fuel compatibility is strong, the total conversion efficiency exceeds 30 percent, and the PEM hydrogen fuel cell has the advantages of low cost and no pollution. The power generation power of the PEM hydrogen fuel cell 3 is 5-100 kW, and the pressure and the flow need to be designed according to a specific station.
In this embodiment, the natural gas hydrogen-mixing gas mixing device 1 may adopt a flow follow-up natural gas hydrogen-mixing gas mixing device, and may perform follow-up mixing according to the flow of hydrogen and natural gas.
The pressure difference power generation equipment 2 is used for generating power for the natural gas passing through the station and controlling the PEM hydrogen fuel cell 3 to generate power by using hydrogen, so that the self-powered function of the natural gas-doped gas mixing device can be realized, the mains supply is not required to be connected, the power supply cost is reduced, and the popularization and the application of the natural gas-doped gas mixing station are facilitated.
As an alternative embodiment of this embodiment, as shown in fig. 1, a pressure gauge 17 is provided on the main gas supply pipe 7 for measuring the gas pressure of the natural gas and sending it to the power supply control device 5; and/or a flowmeter 18 is arranged on the main gas supply pipeline 7 and used for measuring the flow rate of the natural gas supply and sending the natural gas supply to the power supply control device 5; and/or the second hydrogen branch pipe 15 is provided with a pressure gauge 19 for measuring the pressure of the hydrogen coming from the hydrogen supply pipe and sending the measured pressure to the power supply control device 5.
In this optional embodiment, when the pressure gauge 17 and the flow meter 18 are simultaneously disposed on the main gas supply pipe 7, the pressure gauge 17 and the flow meter 18 may be sequentially disposed according to the natural gas flow direction, or the flow meter 18 and the pressure gauge 17 may be sequentially disposed according to the natural gas flow direction, which is related to practical application, and this embodiment is not specifically limited.
The pressure gauge 17, the flow meter 18 and the pressure gauge 19 may be connected to a signal receiving terminal of the power supply control device 5 through signal lines, or may be provided with a built-in wireless communication module to realize wireless communication with the power supply control device 5.
As an optional implementation manner of this embodiment, as shown in fig. 1, the system further includes a hydrogen buffer tank 20 disposed at the intersection of the hydrogen main pipe 13, the first hydrogen branch pipe 14, and the second hydrogen branch pipe 15, the hydrogen buffer tank 20 is provided with a first hydrogen inlet, a first hydrogen outlet, and a second hydrogen outlet, the first hydrogen inlet is connected to the hydrogen main pipe 13, the first hydrogen outlet is connected to the PEM hydrogen fuel cell 3 through the second hydrogen branch pipe 15, and the second hydrogen outlet is connected to the natural gas and hydrogen-mixed gas device 1 through the first hydrogen branch pipe 14. The hydrogen buffer tank 20 may also transmit hydrogen pressure data to the natural gas loading and mixing device 1.
In this alternative embodiment, the hydrogen buffer tank 20 realizes pressure regulation by compressing the internal air, can buffer system pressure fluctuation, eliminate water hammer, stabilize pressure and unload, and is suitable for the situation that the upstream hydrogen supply is unstable.
As an alternative to this embodiment, the power supply device 6 includes: the energy storage module 61 is used for storing the electric energy output by the pressure difference power generation device 2 or the PEM hydrogen fuel cell 3; and the voltage-regulating rectification module 62 is connected with the energy storage module 61 and is used for outputting the electric energy stored in the energy storage module 61 to the natural gas and hydrogen-mixed gas mixing device 1 after voltage-regulating rectification.
In this optional embodiment, the electric energy output by the pressure difference power generation device 2 and the PEM hydrogen fuel cell 3 is gathered into the energy storage module 61 for storage, and then the stored electric energy is subjected to pressure regulation and rectification by the pressure regulation and rectification module 62 and then enters the natural gas and hydrogen blended gas device 1, so as to provide stable power supply voltage for the natural gas and hydrogen blended gas device 1. Optionally, the energy storage module 61 is designed according to 24-hour electricity consumption, and 24V is input/output; the voltage-regulating rectification input voltage is 24V, and the output voltage is 12V/24V/380V.
As an alternative to this embodiment, as shown in fig. 1, the system further comprises an alarm device 22 connected to the power supply control device 5 for issuing an alarm signal when neither the PEM hydrogen fuel cell 3 nor the pressure difference power plant 2 has reached an operating condition.
In this optional embodiment, the alarm device 22 may be an audible and visual alarm or a PC installed in the monitoring room, or may be a mobile terminal (e.g., a mobile phone, a tablet PC, etc.) held by the operator, and notifies the operator to check the alarm in time by means of an audible and visual signal, sending a short message, a telephone, etc., so as to remove the fault, and if only the problem of gas coming from natural gas or hydrogen, the amount of hydrogen needs to be supplemented. If the hydrogen source is an on-site hydrogen tank truck, the manufacturer needs to be contacted to supplement hydrogen; if the hydrogen source is the hydrogen production device, adjusting the hydrogen production amount of the hydrogen production device; if the pipeline supplies gas, the upstream supplement hydrogen is needed to be connected.
As an optional implementation manner of this embodiment, as shown in fig. 1, the system further includes a communication control module 23 and an upper monitoring system 24, and the upper monitoring system 24 sends a control command to the natural gas loading and mixing device 1 through the communication control module 23 to control the start and stop, the gas mixing ratio adjustment, and other functions of the natural gas loading and mixing device 1.
Example two
Fig. 2 is a block diagram of a self-powered system of a natural gas hydrogen-loading gas mixing station according to an embodiment of the present invention, which differs from the first embodiment only in that: a bypass line 21 is added to communicate the main outlet line 10 with the downstream natural gas line 16. The system belongs to a bypass type structure (a straight-through type is shown in figure 1), one part of natural gas output by a gas pressure regulator 4 and a pressure difference power generation device 2 enters a natural gas hydrogen-mixing gas mixing device 1 for hydrogen mixing operation, and the other part of the natural gas is mixed with the hydrogen-mixing natural gas output by the natural gas hydrogen-mixing gas mixing device 1 and then is conveyed to the downstream.
If there is a sufficient source of hydrogen and the owner has a desire to load hydrogen at high concentrations, the through-flow configuration shown in FIG. 1 can be used to load all of the through-station flows. While the bypass configuration shown in figure 2 is suitable for use in the natural gas loading example application of a large pressure regulating station.
EXAMPLE III
An embodiment of the present invention provides a flowchart of a control method for an autonomous power supply system of a natural gas-hydrogen-loading gas mixing plant as described in the first embodiment or the second embodiment, where the method includes:
as shown in fig. 3, when power is currently supplied to the PEM hydrogen fuel cell 3, if the power supply control device 5 determines that the hydrogen pressure measured by the pressure gauge 19 is lower than a first preset value and the incoming natural gas flow measured by the flow meter 18 is higher than a second preset value, the operation is switched to the differential pressure power generation device 2 to supply power to the natural gas-hydrogen mixing device 1; or, if the power supply control device 5 judges that the hydrogen pressure measured by the pressure gauge 19 is lower than the first preset value and the natural gas incoming pressure measured by the pressure gauge 17 is not lower than the required lower pressure limit of the pressure difference power generation equipment 2, switching to the pressure difference power generation equipment 2 to operate to supply power to the natural gas and hydrogen mixing device 1;
as shown in fig. 4, when power is currently supplied to the pressure difference power generation device 2, if the power supply control device 5 determines that the hydrogen pressure measured by the pressure gauge 19 is not lower than the first preset value, the flow rate of the natural gas incoming flow measured by the flow meter 18 is not higher than the second preset value, and the pressure of the natural gas incoming flow measured by the pressure gauge 17 is lower than the lower limit of the required pressure of the pressure difference power generation device 2, the PEM hydrogen fuel cell 3 is switched to operate to supply power to the natural gas hydrogen-mixed gas mixing device 1.
Whether the pressure difference power generation equipment 2 reaches the operation condition or not is judged according to the natural gas incoming pressure and the incoming gas flow which are respectively collected by the pressure gauge 17 and the flow meter 18, whether the PEM hydrogen fuel cell 3 reaches the operation condition or not is judged according to the hydrogen incoming pressure collected by the pressure gauge 19, when one of the pressure difference power generation equipment 2 and the PEM hydrogen fuel cell 3 cannot reach the operation condition, the other one is controlled to operate to supply power to the natural gas hydrogen-mixing gas mixing device 1, the effective dispatching control of the self-power supply system of the natural gas hydrogen-mixing gas station can be realized, the normal operation of the self-power supply system is ensured, and the natural gas hydrogen-mixing process is further ensured.
As an optional implementation manner of this embodiment, the method further includes: if the power supply control device 5 judges that the hydrogen pressure measured by the pressure gauge 19 is lower than the first preset value, the flow rate of the natural gas incoming flow measured by the flow meter 18 is not higher than the second preset value, and the pressure of the natural gas incoming flow measured by the pressure gauge 17 is lower than the lower limit of the required pressure of the differential pressure power generation equipment 2, the electric energy stored by the power supply device 6 is the natural gas blending device 1, and the alarm device 22 is controlled to send out an alarm signal.
When the PEM hydrogen fuel cell 3 and the differential pressure power generation equipment 2 do not reach the operating conditions, the power supply control device 5 controls the alarm device 22 to send an alarm signal to operators, so that the operators can solve the problems as soon as possible, recover the normal power supply function and ensure the normal operation of the natural gas hydrogen-mixing gas mixing device 1.
The first preset value and the second preset value are determined by factors such as field measurement negative feedback, flow stability and the like, and optionally, the first preset value is 0.2 Mpa; the second preset value is 50% of the rated flow of the pressure power generation equipment.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship, unless otherwise specified.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A self-powered system for a natural gas blending station, comprising: the system comprises a natural gas hydrogen-mixing gas mixing device, a differential pressure power generation device, a PEM hydrogen fuel cell, a fuel gas pressure regulator, a power supply control device and a power supply device;
the natural gas at the upstream is conveyed to the differential pressure power generation equipment through a main gas inlet pipeline and a first gas inlet branch pipeline in sequence, and the natural gas output by the differential pressure power generation equipment is conveyed to the natural gas hydrogen-mixing device through a first gas outlet branch pipeline and a main gas outlet pipeline in sequence;
the upstream natural gas is conveyed to the gas pressure regulator through the main gas inlet pipeline and the second gas inlet branch pipeline in sequence, and the natural gas output by the gas pressure regulator is conveyed to the natural gas hydrogen-mixing device through the second gas outlet branch pipeline and the main gas outlet pipeline in sequence;
the differential pressure power generation equipment is provided with a first control end and a first electric energy output end, wherein the first control end is connected with the electric power supply control device, and the first electric energy output end is connected with the power supply device;
hydrogen is conveyed to the natural gas and hydrogen-blended gas mixing device through a hydrogen main pipeline and a first hydrogen branch pipeline in sequence; hydrogen is conveyed to the PEM hydrogen fuel cell through the hydrogen main pipeline and the second hydrogen branch pipeline in sequence;
the PEM hydrogen fuel cell is provided with a second control end and a second electric energy output end, wherein the second control end is connected with the electric power supply control device, and the second electric energy output end is connected with the power supply device;
the power supply control device is used for carrying out scheduling control on the pressure difference power generation equipment and the PEM hydrogen fuel cell; the power supply device is connected with the natural gas hydrogen-mixing gas mixing device and is used for storing electric energy and providing the electric energy for the natural gas hydrogen-mixing gas mixing device; the natural gas hydrogen-mixing gas mixing device outputs hydrogen-mixing natural gas through a downstream natural gas pipeline.
2. The self-powered system of a natural gas hydrogen-loading gas mixing station as claimed in claim 1, wherein the main gas supply pipeline is provided with a pressure gauge for measuring the pressure of the natural gas supply gas and sending the pressure to the power supply control device; and/or
The main gas supply pipeline is provided with a flowmeter and used for measuring the flow rate of natural gas incoming gas and sending the flow rate to the power supply control device; and/or
And the second hydrogen branch pipeline is provided with a pressure gauge for measuring the pressure intensity of hydrogen coming from the hydrogen supply branch pipeline and sending the pressure intensity to the power supply control device.
3. The self-powered system of a natural gas hydrogen-loading gas mixing station as claimed in claim 1 or 2, further comprising a hydrogen buffer tank arranged at the junction of the hydrogen main pipeline, the first hydrogen branch pipeline and the second hydrogen branch pipeline, wherein the hydrogen buffer tank is provided with a first hydrogen inlet, a first hydrogen outlet and a second hydrogen outlet, the first hydrogen inlet is connected with the hydrogen main pipeline, the first hydrogen outlet is connected with the PEM hydrogen fuel cell through the second hydrogen branch pipeline, and the second hydrogen outlet is connected with the natural gas hydrogen-loading gas mixing device through the first hydrogen branch pipeline.
4. The self-powered system of a natural gas hydrogen-loading gas mixing plant according to claim 1 or 2, characterized in that the power supply device comprises:
the energy storage module is used for storing the electric energy output by the pressure difference power generation equipment or the PEM hydrogen fuel cell; and
and the pressure regulating and rectifying module is connected with the energy storage module and is used for outputting the electric energy stored by the energy storage module to the natural gas and hydrogen mixing device after pressure regulating and rectifying.
5. The self-powered system of a natural gas hydrogen-loading gas mixing station as claimed in claim 1 or 2, characterized by further comprising a bypass pipeline for communicating the main outlet pipeline with a downstream natural gas pipeline.
6. The self-powered system of a natural gas hydrogen-loading gas mixing plant as claimed in claim 1 or 2, further comprising an alarm device connected to the power supply control device for sending an alarm signal when neither the PEM hydrogen fuel cell nor the pressure difference power generation equipment reaches an operating condition.
7. A control method for the self-powered system of the natural gas hydrogen-loading gas mixing plant according to any one of claims 2 to 6, characterized by comprising:
when the power supply control device judges that the hydrogen pressure measured by the pressure gauge is lower than a first preset value and the incoming flow rate of the natural gas measured by the flow meter is higher than a second preset value, the power supply control device switches to the pressure difference power generation equipment to operate to supply power to the natural gas-hydrogen-mixed gas device; or if the power supply control device judges that the hydrogen pressure measured by the pressure gauge is lower than a first preset value and the natural gas incoming pressure measured by the pressure gauge is not lower than the required pressure lower limit of the differential pressure power generation equipment, switching to the differential pressure power generation equipment to operate to supply power to the natural gas and hydrogen mixing device;
and currently supplying power to the pressure difference power generation equipment, if the power supply control device judges that the hydrogen pressure measured by the pressure gauge is not lower than the first preset value, the flow rate of the natural gas incoming flow measured by the flow meter is not higher than the second preset value, and the pressure of the natural gas incoming flow measured by the pressure gauge is lower than the lower limit of the required pressure of the pressure difference power generation equipment, switching to the PEM hydrogen fuel cell to operate to supply power to the natural gas hydrogen-doped gas mixing device.
8. The control method according to claim 7, characterized by further comprising:
if the power supply control device judges that the hydrogen pressure measured by the pressure gauge is lower than a first preset value, the flow rate of the natural gas incoming flow measured by the flow meter is not higher than a second preset value, and the pressure of the natural gas incoming flow measured by the pressure gauge is lower than the lower limit of the required pressure of the differential pressure power generation equipment, the electric energy stored by the power supply device is used as the natural gas blending device, and the alarm device is controlled to send an alarm signal.
9. The control method according to claim 7 or 8, characterized in that the first preset value is 0.2 MPa.
10. The control method according to claim 7 or 8, wherein the second preset value is 50% of a rated flow rate of the pressure power plant.
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| CN202010490815.8A CN111541299A (en) | 2020-06-02 | 2020-06-02 | Self-powered system of natural gas hydrogen-mixing gas mixing station and control method thereof |
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| CN202010490815.8A CN111541299A (en) | 2020-06-02 | 2020-06-02 | Self-powered system of natural gas hydrogen-mixing gas mixing station and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113405025A (en) * | 2021-06-17 | 2021-09-17 | 深圳市燃气集团股份有限公司 | Stable natural gas hydrogen-loading control method and application |
| CN114001278A (en) * | 2021-09-16 | 2022-02-01 | 北京市燃气集团有限责任公司 | Hydrogen-mixing gas mixing method and system for urban gas burning valve station |
| EP4047260A1 (en) * | 2021-02-18 | 2022-08-24 | Linde GmbH | Method for controlling or regulating the hydrogen content of a natural gas transported through a natural gas network |
| CN116128692A (en) * | 2022-12-23 | 2023-05-16 | 北京市煤气热力工程设计院有限公司 | Progressive assessment method and system for hydrogen loading and conveying of urban natural gas pipeline network |
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2020
- 2020-06-02 CN CN202010490815.8A patent/CN111541299A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4047260A1 (en) * | 2021-02-18 | 2022-08-24 | Linde GmbH | Method for controlling or regulating the hydrogen content of a natural gas transported through a natural gas network |
| CN113405025A (en) * | 2021-06-17 | 2021-09-17 | 深圳市燃气集团股份有限公司 | Stable natural gas hydrogen-loading control method and application |
| WO2022262286A1 (en) * | 2021-06-17 | 2022-12-22 | 深圳市燃气集团股份有限公司 | Stable hydrogen-doped natural gas control method and application |
| CN113405025B (en) * | 2021-06-17 | 2023-02-28 | 深圳市燃气集团股份有限公司 | Stable natural gas hydrogen-loading control method and application |
| CN114001278A (en) * | 2021-09-16 | 2022-02-01 | 北京市燃气集团有限责任公司 | Hydrogen-mixing gas mixing method and system for urban gas burning valve station |
| CN116128692A (en) * | 2022-12-23 | 2023-05-16 | 北京市煤气热力工程设计院有限公司 | Progressive assessment method and system for hydrogen loading and conveying of urban natural gas pipeline network |
| CN116128692B (en) * | 2022-12-23 | 2023-08-25 | 北京市煤气热力工程设计院有限公司 | Progressive assessment method and system for hydrogen loading and conveying of urban natural gas pipeline network |
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