WO2022262286A1 - Stable hydrogen-doped natural gas control method and application - Google Patents

Abstract

A stable hydrogen-doped natural gas control method, comprising the following steps: step 1, hydrogen-doped natural gas of a natural gas gate station is transported to a downstream community user by means of a gas pipe network, multiple stages of pressure reducing valves being mounted in the gas pipe network; step 2, a solid fuel cell is mounted at a specific point of the downstream community user; and step 3, the hydrogen-doped natural gas first enters the solid fuel cell before entering a household, and generates electricity by means of the solid fuel cell for input into the household. By means of a distributed control method for hydrogen-doped natural gas, the problem of pipeline transportation and utilization of hydrogen-doped natural gas is solved, and the distribution state and power supply mode of natural gas doped with hydrogen in a charging pile are well matched by means of pressure reducing valves, which expands the application direction.

Description

A control method and application of natural gas stable hydrogen addition technical field

The invention belongs to the technical field of hydrogen energy utilization, and in particular relates to a method for controlling the stable hydrogen addition of natural gas and its application.

Background technique

The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

Due to its wide range of sources, clean and low-carbon, high efficiency and flexibility, hydrogen plays a key role in promoting global energy transformation and realizing green and sustainable development. Hydrogen transportation is an important part of hydrogen energy utilization, and its long-distance transportation has attracted extensive attention. At present, hydrogen is mainly transported by high-pressure hydrogen cylinder long-tube trailers, liquid hydrogen tank trucks, and liquid hydrogen barges. However, these methods have high storage and transportation costs and low efficiency, and it is difficult to solve the problem of long-distance, large-scale, and low-cost transportation of hydrogen. Therefore, under the condition that the current hydrogen transmission and distribution infrastructure is not perfect, mixing hydrogen with natural gas in a certain proportion and using the existing natural gas pipeline network to mix and transport hydrogen is a feasible way to transition to hydrogen energy. In recent years, many scholars at home and abroad have been studying how to mix natural gas and hydrogen in the existing natural gas pipeline network in order to reduce greenhouse gas emissions and improve hydrogen transmission efficiency. According to the research, at this stage, domestic and foreign patents involving hydrogen-doped natural gas pipeline transportation process mainly include:

Chinese patent CN111732077A discloses an energy-saving and high-efficiency utilization system for hydrogen production, including a tank body. There are multiple sets of heating tubes installed in the tank body. A water adding device is installed on the tank body on one side of the heating tube. One side of the water adding device moves to connect to the water inlet. The opening is located on the side wall of the tank, and the water inlet is far away from the water adding device. There is a heating device installed on the outer wall of the tank. Gas outlet device, there are multiple sets of raw material processing devices above the gas outlet device, so that water can be added without stopping the equipment, avoiding the situation where the temperature is too low due to direct addition of cold water, which will affect the work efficiency and effect, which is convenient for customers to use, so that the hydrogen raw material can be heated more The uniform heat preservation effect is better, and at the same time, a sufficient amount of water vapor is guaranteed to react with the raw materials, the reaction efficiency is improved, and the investment in equipment is reduced.

Chinese patent CN111717889A discloses a portable hydrogen production device, which involves hydrogen production technology, including a reactor, a cleaner, an absorption filter, a hydrogen bag and an atomization bottle, wherein the reactor, a cleaner, an absorption filter, a hydrogen bag and a mist The atomization bottles are all connected by pipelines, the first water inlet pipe is connected to the reactor, the hydrogen suction pipe is connected to the atomization bottle, a valve is arranged on the first water inlet pipe, and the absorption and filtration The pipeline between the device and the hydrogen bag and the pipeline between the hydrogen bag and the atomizing bottle are all provided with valves. The device disclosed by the invention can produce clean and humid hydrogen to ensure the quality of the hydrogen.

Chinese patent CN107314242A discloses a hydrogen and natural gas blending transportation and separation device, including a conveying pipeline for conveying materials, the conveying pipeline is provided with a hydrogen energy input port and a blending device for mixing hydrogen energy and materials device; the other end of the delivery pipeline is also provided with a separation and purification device for separating hydrogen energy, and the separation and purification device is provided with a hydrogen energy output port. The hydrogen and natural gas blending, transportation and separation device provided by this application reforms the existing material delivery pipeline by adding hydrogen energy input port and hydrogen energy output port, and passing hydrogen energy Blending and separation with materials to realize the delivery of hydrogen energy. The present invention utilizes existing material delivery pipelines to realize a large amount of efficient and stable hydrogen energy transportation, can realize the most economical hydrogen energy transportation mode, and provides necessary support for hydrogen energy application in urban areas.

Most of the existing patents use hydrogen production equipment to generate hydrogen for the production, storage and utilization of hydrogen, and most of the mixed transportation of hydrogen and natural gas requires separation after mixing, which is costly and difficult to popularize and apply. At the same time, the density of hydrogen is 0.090Kg/Nm ³ , and that of methane is 0.717Kg/Nm ³ . The density difference between the two is very large, which easily produces stratification and affects the utilization efficiency.

Therefore, a method for controlling the stable hydrogen addition of natural gas is proposed, and then the reasonable layout optimization of hydrogen production, blending, transportation, and utilization is carried out to reduce investment, reduce safety risks, ensure stable operation of the system, and increase the feasibility of hydrogen utilization. Significance.

Contents of the invention

In view of the technical problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method for controlling the stable hydrogen doping of natural gas, which solves the problems of difficulty in hydrogen storage and transportation, high cost, and stratification, and increases the feasibility and applicability of hydrogen utilization. sex.

In order to solve the above technical problems, the technical solution of the present invention is:

The first aspect of the present invention provides a method for controlling the stable hydrogen addition of natural gas, comprising the following steps:

Step 1, the hydrogen-doped natural gas at the natural gas gate station is transported to the downstream community users through the gas pipeline network, and the gas pipeline network is equipped with multi-stage pressure reducing valves;

Step two, install solid fuel cells at specific points of downstream community users;

Step 3: The hydrogen-doped natural gas first enters the solid fuel cell before entering the home, and the solid fuel cell generates electricity and enters the home.

The second aspect of the present invention provides the application of the above method for controlling the stable hydrogen addition of natural gas in fuel cell charging piles.

The third aspect of the present invention provides the application of the above method for controlling the stable hydrogen addition of natural gas in urban power supply.

Compared with the prior art, the beneficial technical effects of the above one or more embodiments of the present invention are:

(1) The method for controlling the stable hydrogen addition of natural gas in the present invention adopts a distributed method, which solves the problem of pipeline transportation of hydrogen-doped natural gas, has low cost and high safety, and is conducive to reducing carbon dioxide emissions and promoting the hydrogen energy industry. At the same time, after sending hydrogen-doped natural gas into solid fuel cells, it can also be sent to residential users. Compared with the traditional method of separating hydrogen-doped natural gas and then sending it to residential users, it not only saves the process and reduces costs, but more importantly Yes, efficiency can be increased.

(2) The control method of the present invention can be used in charging piles, which is not only safe and reliable, but also has a better charging effect than the way of directly connecting to the power grid in the prior art. Since it can be independent of the power grid, it can supplement the electricity demand of the city during the peak period of electricity consumption, and can also be applied to the charging and power supply operation needs of remote areas.

(3) The present invention installs multi-stage pressure reducing valves in the gas pipeline network, which can make the hydrogen-doped gas flow stably in the pipeline without stratification, and then can be applied in various fields, expanding the application field and improving the Application flexibility.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

Fig. 1 is a flow chart of a control method for stably adding hydrogen to natural gas provided by Embodiment 1 of the present invention.

1. Natural gas gate station, 2. Hydrogen-doped natural gas, 3. Natural gas and hydrogen blending device, 4. Gas transmission pipeline, 5. Solid oxide fuel cell, 6. Residential users.

detailed description

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

As mentioned above, most of the existing mixed transportation of hydrogen and natural gas needs to be separated after blending, which is costly, difficult to popularize and apply, and there is a phenomenon of stratification, which affects the utilization efficiency.

In view of this, the present invention designs a method for controlling the stable hydrogen addition of natural gas, which solves the difficulties of hydrogen storage, transportation and utilization, high cost, and stratification, and increases the feasibility and applicability of hydrogen utilization.

The first aspect of the present invention provides a method for controlling the stable hydrogen addition of natural gas, comprising the following steps:

Step 1: Transport the hydrogen-doped natural gas from the natural gas gate station to downstream community users through the gas pipeline network;

Step two, install solid fuel cells at specific points of downstream community users;

Step 3: The hydrogen-doped natural gas first enters the solid fuel cell before entering the home, and the solid fuel cell generates electricity and enters the home.

In a typical implementation, in step 1, the gas pipeline network is equipped with multi-stage pressure reducing valves. The pressure reducing valves in the prior art reduce the inlet pressure to a certain required outlet pressure through adjustment, and rely on The energy of the medium itself keeps the outlet pressure automatically stable. The present invention uses a pressure reducing valve to change the flow rate and kinetic energy of the fluid by changing the throttle area, resulting in different pressure losses, so that the hydrogen-doped gas is in a stable flow in the pipeline. , no delamination occurs. The inventors found that by using a pressure reducing valve to reduce the system pressure, the pressures of natural gas and hydrogen can be kept in a relatively balanced state, so that hydrogen-doped natural gas improves the occurrence of stratification during the flow of pipelines. The applicant further found that different pressures of the pressure reducing valve have different effects on improving the stratification phenomenon. When the pressure of the pressure reducing valve is controlled within the range of 0.5MPa-8MPa, the stratification phenomenon can be improved to the greatest extent. When the pressure is lower than 0.5MPa When the pressure of the hydrogen-doped natural gas is not enough to make the flow state in a state of sufficient balance, when the pressure is higher than 8MPa, the pressure of the hydrogen-doped natural gas is too large to cause a large pressure swing, which cannot exert the effect of stabilizing the pressure, and thus cannot improve the flow rate of the mixed gas. Stratification phenomenon of hydrogen and natural gas. Preferably, in order to further improve the stratification phenomenon, fins are provided in the decompression valve, which can evenly disturb the gas in the tube to make it in a turbulent state, and further ensure that the gas in the tube is not stratified.

In a typical implementation, in step 1, the setting method of the multi-stage pressure reducing valve is: the proportional pressure reducing valve and the stable pressure reducing valve are used in series, firstly adjust the outlet pressure proportionally according to the inlet pressure, and then enter The steady pressure reducing valve reduces the pressure to the set value.

In a typical implementation, in step 1, the hydrogen-doped natural gas at the natural gas gate station can come from the upstream pipeline, or can be mixed with hydrogen at the gate station, and the hydrogen content of the outbound gas at the natural gas gate station is 5%-20% %, if the hydrogen content is higher than 20%, it will cause hydrogen damage such as hydrogen embrittlement, hydrogen-induced cracking, hydrogen bulging and decarburization; the amount of hydrogen entering the gas pipeline is dynamically controlled by the amount of natural gas in the pipeline, and the hydrogen doping ratio is Rated value under this condition.

In a typical implementation, in step 1, the on-site hydrogen blending device at the gate station can control the blending rate of the gas pipeline network at a rated hydrogen blending ratio according to the amount of natural gas entering the gas pipeline downstream through the built-in logic control system. The amount of hydrogen, and evenly mix natural gas and hydrogen.

In a typical implementation, in step 1, some aboveground gas pipelines are connected in parallel with multiple materials (such as PE, carbon steel, cast iron, etc.), so as to facilitate real-time monitoring of the impact of hydrogen-doped natural gas on different material pipelines and pipelines during operation. The impact of components is convenient for reference comparison of the operation of the entire system and the inspection and protection cycle.

In a typical implementation, in step 2, the K-means algorithm is used to optimize the layout of the installation points, and the "star-branch" joint distribution method is adopted, and the installation points should be arranged in a way of one use and one standby Fuel cells, so that the number and power of solid fuel cells can be adapted to the peak period of residential users' electricity consumption; the "star-branch" distribution method can avoid the disadvantages that other installation points cannot be used when one installation point fails , and at the same time, it can reduce the installation cost of the solid fuel cell, and improve the community's acceptance of the solid fuel cell.

In a typical implementation, in step 2, the specific process of the K-means algorithm is: divide the number of users into K groups in advance, randomly select K arrangement points as the initial cluster centers, and then calculate the The distance from each deployment point, each user is assigned to the nearest deployment point, the deployment points and the users assigned to them represent a cluster, each time a user is assigned, the cluster’s deployment points will be based on the cluster Existing users in the community are recalculated and repeated until all users in the community are calculated.

In a typical implementation, in step 3, a flow-following pressure regulating valve is installed in front of the solid fuel cell. The processing pressure can meet the processing flow. Preferably, the inlet pressure of the solid fuel cell is greater than 2.0KPa. Under this pressure, the hydrogen-doped natural gas can be stably fed into the solid fuel cell system, and the power generation is greater than 3.0KW, which can meet the supply demand.

The second aspect of the present invention provides the application of the above method for controlling the stable hydrogen addition of natural gas in fuel cell charging piles.

In the prior art, hydrogen-doped natural gas is used in vehicle-mounted fuel cells. The fuel in the fuel cell carried by the vehicle undergoes a redox reaction with oxygen in the atmosphere to generate electrical energy to drive the electric vehicle, and the electric motor drives the vehicle. The mechanical transmission structure in the vehicle, and then drives the front axle and other walking mechanical structures of the car to work, thereby driving the electric car forward. The input end of the charging pile is directly connected to the grid, and the output end is equipped with a charging plug to charge the electric vehicle. The difference between the two working methods comes from the fact that in the vehicle-mounted fuel cell, the gaseous fuel can be supplied to the fuel cell stack through the decompression stage and the humidification of the humidifier, but the distribution of the mixed gas in the charging pile and its power supply mode cannot be achieved well. The matching, and then affect the power supply effect. In this application, controlling the distribution state of hydrogen-doped natural gas through the pressure reducing valve can achieve a good coordination effect with the working mode of the charging pile, thereby meeting the power supply demand.

The third aspect of the present invention provides the application of the above-mentioned method for controlling the stable hydrogen addition of natural gas in urban power supply, comprehensive utilization of hydrogen energy, and the introduction of hydrogen into thousands of households.

Charging piles can be connected to the city's power supply network, and the charging piles can supplement the city's point-of-use demand during the peak period of electricity consumption. Since it is separated from the power grid, this model has important practical value for charging and power supply operations in remote areas.

Example 1

A method for controlling the stable hydrogen addition of natural gas, comprising the following steps:

Step 1. The hydrogen-doped natural gas at the natural gas gate station is transported to downstream users through the gas pipeline network. The hydrogen content is 5%. The hydrogen-doped device at the gate station can use the built-in logic control system according to the amount of natural gas entering the gas pipeline downstream. With the rated hydrogen doping ratio, control the amount of hydrogen blended into the gas pipeline network, and mix natural gas and hydrogen evenly; install multi-stage pressure reducing valves in the gas pipeline network, and use proportional pressure reducing valves and stable pressure reducing valves in series. Control the outlet pressure of the pressure reducing valve to 1.0MPa. The multi-stage pressure reducing valve makes the hydrogen-doped gas flow stably in the pipeline without stratification; The turbulent flow state further ensures that the gas in the tube is not stratified. At the same time, the pipelines in the gas pipeline network are connected in parallel with PE and carbon steel, which facilitates real-time monitoring of the impact of hydrogen-doped natural gas on pipelines and components of different materials during operation, and facilitates the operation of the entire system and the inspection and protection cycle. Do a reference comparison.

Step 2: Install solid fuel cells at specific points of users in the downstream community. The arrangement of the installation points is optimized using the K-means algorithm. The number of users is pre-divided into K groups, and K points are randomly selected as the initial clustering centers, and then Calculate the distance between each user and each layout point, and assign each user to the nearest layout point. The layout points and the users assigned to them represent a cluster. Each time a user is assigned, the cluster's layout points It will be recalculated based on the existing users in the cluster, and repeat until all users in the community are calculated. The "star-branch" joint distribution method is adopted, and the solid fuel cells are arranged in a way of one use and one standby at the installation point, so that the number and power of solid fuel cells can be adapted to the peak period of residential users' electricity consumption;

Step 3: The hydrogen-doped natural gas first enters the solid fuel cell before it enters the household, and the solid fuel cell generates electricity and enters the household. A flow-following pressure regulating valve is installed in front of the solid fuel cell. The opening of the power generation can be controlled to meet the processing pressure of the solid fuel cell and the processing flow; it is enough to control the inlet pressure of the solid fuel cell to be greater than 2.0KPa and the power generation to be greater than 3.0KW.

Example 2

A method for controlling the stable hydrogen addition of natural gas, comprising the following steps:

Step 1. The hydrogen-doped natural gas at the natural gas gate station is transported to downstream users through the gas pipeline network. The hydrogen content is 15%. The in-situ hydrogen doping device at the gate station can use the built-in logic control system according to the amount of natural gas entering the gas pipeline downstream. With the rated hydrogen doping ratio, control the amount of hydrogen blended into the gas pipeline network, and mix natural gas and hydrogen evenly; install multi-stage pressure reducing valves in the gas pipeline network, and use proportional pressure reducing valves and stable pressure reducing valves in series. The outlet pressure of the pressure reducing valve is controlled to 4.0MPa. The multi-stage pressure reducing valve makes the hydrogen-doped gas flow stably in the pipeline without stratification; The turbulent flow state further ensures that the gas in the tube is not stratified. At the same time, the pipelines in the gas pipeline network are connected in parallel with PE and carbon steel, which facilitates real-time monitoring of the impact of hydrogen-doped natural gas on pipelines and components of different materials during operation, and facilitates the operation of the entire system and the inspection and protection cycle. Do a reference comparison.

Step 2: Install solid fuel cells at specific points of users in the downstream community. The arrangement of the installation points is optimized using the K-means algorithm. The number of users is pre-divided into K groups, and K points are randomly selected as the initial clustering centers, and then Calculate the distance between each user and each layout point, and assign each user to the nearest layout point. The layout points and the users assigned to them represent a cluster. Each time a user is assigned, the cluster's layout points It will be recalculated based on the existing users in the cluster, and repeat until all users in the community are calculated. The "star-branch" joint distribution method is adopted, and the solid fuel cells are arranged in a way of one use and one standby at the installation point, so that the number and power of solid fuel cells can be adapted to the peak period of residential users' electricity consumption;

Step 3: The hydrogen-doped natural gas first enters the solid fuel cell before it enters the household, and the solid fuel cell generates electricity and enters the household. A flow-following pressure regulating valve is installed in front of the solid fuel cell. The opening of the power generation can be controlled to meet the processing pressure of the solid fuel cell and the processing flow; it is enough to control the inlet pressure of the solid fuel cell to be greater than 2.0KPa and the power generation to be greater than 3.0KW.

Example 3

A method for controlling the stable hydrogen addition of natural gas, comprising the following steps:

Step 1. The hydrogen-doped natural gas at the natural gas gate station is transported to downstream users through the gas pipeline network. The hydrogen content is 20%. The in-situ hydrogen doping device at the gate station can use the built-in logic control system according to the amount of natural gas entering the gas pipeline downstream. With the rated hydrogen doping ratio, control the amount of hydrogen blended like the gas pipeline network, and mix the natural gas and hydrogen evenly; the proportional pressure reducing valve and the stable pressure reducing valve are used in series, and the outlet pressure of the pressure reducing valve is controlled to 6.0MPa. The multi-stage pressure reducing valve makes the hydrogen-doped gas flow stably in the pipeline without stratification; the multi-stage pressure reducing valve is also equipped with fins, which can evenly disturb the gas in the tube and make it in a turbulent state, further ensuring that the gas in the tube is not stratified . At the same time, the pipelines in the gas pipeline network are connected in parallel with PE and carbon steel, which facilitates real-time monitoring of the impact of hydrogen-doped natural gas on pipelines and components of different materials during operation, and facilitates the operation of the entire system and the inspection and protection cycle. Do a reference comparison.

Step 2: Install solid fuel cells at specific points of users in the downstream community. The arrangement of the installation points is optimized using the K-means algorithm. The number of users is pre-divided into K groups, and K points are randomly selected as the initial clustering centers, and then Calculate the distance between each user and each layout point, and assign each user to the nearest layout point. The layout points and the users assigned to them represent a cluster. Each time a user is assigned, the cluster's layout points It will be recalculated based on the existing users in the cluster, and repeat until all users in the community are calculated. The "star-branch" joint distribution method is adopted, and the solid fuel cells are arranged in a way of one use and one standby at the installation point, so that the number and power of solid fuel cells can be adapted to the peak period of residential users' electricity consumption;

Step 3: The hydrogen-doped natural gas first enters the solid fuel cell before it enters the household, and the solid fuel cell generates electricity and enters the household. A flow-following pressure regulating valve is installed in front of the solid fuel cell. The opening of the power generation can be controlled to meet the processing pressure of the solid fuel cell and the processing flow; it is enough to control the inlet pressure of the solid fuel cell to be greater than 2.0KPa and the power generation to be greater than 3.0KW.

Comparative example 1

The control pressure reducing valve pressure is set to 0.4MPa, and other parameter conditions are identical with embodiment 1.

Comparative example 2

The control pressure reducing valve pressure is set to 8.5MPa, and other parameter conditions are identical with embodiment 1.

Performance Testing

According to the control methods of Examples 1-3 and Comparative Examples 1-2, a certain community in Jinan City, Shandong Province was taken as the object of investigation, and compared with the charging effect of traditional charging piles in the prior art, the safety, stability and other indicators, as shown in Table 1 below.

Table 1 Comparison of Charging Effects of Examples 1-3, Comparative Examples 1-2 and the Charging Pile of the Prior Art

the	power generation efficiency	safety	stability
Example 1	90%	very high	very good
Example 2	88%	very high	very good
Example 3	85%	very high	very good
Comparative example 1	40%	generally	poor
Comparative example 2	35%	generally	poor
current technology	60%	generally	generally

It can be seen from the above that the best power supply effect can be obtained only by controlling the pressure of the pressure reducing valve within the range mentioned in this application. The control method of the present application can achieve technical effects comparable to the charging method of the prior art, and has important practical significance.

Matters not covered in the above embodiments are known technologies.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. A method for controlling stable hydrogen addition to natural gas, characterized in that it comprises the following steps:

   Step 1, the hydrogen-doped natural gas at the natural gas gate station is transported to the downstream community users through the gas pipeline network, and the gas pipeline network is equipped with multi-stage pressure reducing valves;

   Step two, install solid fuel cells at specific points of downstream community users;

   Step 3: The hydrogen-doped natural gas first enters the solid fuel cell before entering the home, and the solid fuel cell generates electricity and enters the home.
2. The method for controlling the stable hydrogen addition of natural gas according to claim 1, characterized in that in step 1, the pressure of the pressure reducing valve is controlled to be 0.5MPa-8MPa.
3. The method for controlling the stable hydrogen addition of natural gas according to claim 1, characterized in that, in step 1, the setting method of the multi-stage pressure reducing valve is: the proportional pressure reducing valve and the stable pressure reducing valve are used in series, and first according to the inlet pressure according to Proportionally adjust the outlet pressure, and then enter the stable pressure reducing valve to reduce the pressure to the set value.
4. The method for controlling the stable hydrogen addition of natural gas according to claim 1, characterized in that in step 1, the hydrogen-doped natural gas at the natural gas gate station can come from the upstream pipeline, or can be mixed with hydrogen at the gate station, and the natural gas gate station The hydrogen content of station gas is 5%-20%. The amount of hydrogen entering the gas transmission pipeline is dynamically controlled by the amount of natural gas in the pipeline. The hydrogen doping ratio is the rated value under this working condition.
5. According to claim 1, the method for controlling stable hydrogen doping of natural gas is characterized in that, in step 1, the on-site hydrogen doping device at the gate station can do hydrogen doping at a rated rate according to the amount of natural gas entering the gas pipeline downstream through the built-in logic control system. Ratio, control the amount of hydrogen blended like a gas pipeline network, and mix natural gas and hydrogen evenly.
6. The method for controlling the stable hydrogen doping of natural gas according to claim 1, wherein in step 1, part of the above-ground gas pipelines are connected in parallel with multiple materials.
7. According to claim 1, the natural gas stable hydrogen addition control method is characterized in that, in step 2, the arrangement of the installation points adopts the K-means algorithm to optimize the arrangement, adopts the "star-branch" joint distribution method, and the installation points Solid fuel cells should be arranged in a one-use-one-standby manner.
8. The method for controlling the stable hydrogen addition of natural gas according to claim 1, wherein in step 3, a flow-following pressure regulating valve is installed in front of the solid fuel cell, and the flow-following pressure regulating valve can be used according to the gas flow rate and the power generation capacity of the solid fuel cell Control the opening.
9. The application of the control method for stabilizing hydrogen addition to natural gas according to any one of claims 1-8 in fuel cell charging piles.
10. The application of the method for controlling the stable hydrogen addition of natural gas according to any one of claims 1-8 in urban power supply.

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