CN217635096U - Mixed hydrogen feeding device, hydrogen adding device and distribution system by using natural gas pipeline - Google Patents

Abstract

The utility model discloses a mixing hydrogen feeding device, a hydrogen loading device and a distribution system by using a natural gas pipeline, wherein the mixing hydrogen feeding device by using the natural gas pipeline comprises the natural gas pipeline, and a hydrogen pipeline is arranged in the natural gas pipeline; the tail end of the natural gas pipeline is sealed, the hydrogen pipeline continues to extend forwards along the axial direction of the natural gas pipeline, and a natural gas outlet branch pipe is arranged on the side wall of the natural gas pipeline. Through the cooperation of hydrogen conveying device, loading device and distribution system, effectively utilize current natural gas line, realize that the hydrogen gas source is from transportation, mixing to the use of supplying with user terminal, realize the preferential utilization to current pipeline, reduce the cost of defeated hydrogen fortune hydrogen, and can improve the loading proportion, have the promotion meaning to hydrogen energy development.

Description

Mixed hydrogen delivery device, hydrogen loading device and distribution system by using natural gas pipeline

Technical Field

The utility model belongs to the technical field of the new forms of energy, concretely relates to utilize mixed hydrogen feeding device of natural gas line, hydrogen loading device and distribution system.

Background

The hydrogen energy is a secondary energy, is prepared by other energy through a certain method, and is not similar to coal, petroleum, natural gas and the like which can be directly exploited from the underground and almost completely depend on fossil fuels. The hydrogen energy is regarded as the clean energy with the most development potential in the 21 st century, and the hydrogen energy industry is a strategic emerging industry and a key development direction of the future industry.

In the development of hydrogen energy, the transportation cost of hydrogen accounts for about 30-40% of the final cost of hydrogen in a hydrogen refueling station. The risk of leakage and explosion is increased by the hydrogen loading, and the influence is increased by the increase of the hydrogen loading proportion, so that the overall operation risk of the pipe network is increased to a certain extent. The economic transportation of hydrogen is indeed a bottleneck problem which restricts the development of the hydrogen energy industry. The existing relatively perfect natural gas pipeline facilities are utilized, and hydrogen with a certain proportion is mixed for transmission, so that the method becomes a research hotspot in countries of Europe and America.

2007. The Sustainable Ameland project implemented in the Netherlands in the year is proved through 4 years of actual operation that the influence of hydrogen doping on low-pressure nonmetal pipelines can be ignored, the influence on rubber seals, valves, copper pipes and metering facilities is very small, the ignition, tempering, leakage, flame stabilization and the like of a user terminal can meet the standard requirements, the discharge amount of carbon oxides and nitrogen oxides generated by combustion can be greatly reduced after the hydrogen doping, and the environmental protection benefit is obvious. At present, the largest-scale PTM project in the whole world is an E-Gas project of Audi company in Germany, and the prepared hydrogen and carbon dioxide are subjected to methanation reaction to generate methane through a 6.3 MW wind power water electrolysis device and then are injected into a natural Gas pipeline. The largest PTH project in Germany is located in Meiniez, which uses wind power and commercial power to electrolyze water to produce hydrogen with the scale of 3.75 MW, and then mixes the hydrogen into a low-pressure natural gas pipeline with the operating pressure of 0.6-0.8 MPa, and the hydrogen mixing proportion is 15%. From the operation condition of the European and American natural gas pipeline Hydrogen adding (HIGG) actual project, the method is technically feasible within a certain Hydrogen adding proportion range.

Research shows that due to density difference, the power consumption of a compressor for conveying hydrogen with the same energy in a pipe is about 3.3 times that of natural gas, and the energy consumption of the compressor is increased by about 12% by 10% of hydrogen, so that the cost of the hydrogen in the pipe is greatly higher than that of the natural gas in the pipe. But a booster station is not needed for regional middle and low pressure natural gas pipelines, so that the influence on the compressor is not needed to be considered and evaluated. The metering accuracy of the original natural gas metering facility is influenced by the hydrogen adding, and the metering facility needs to be replaced or improved when the hydrogen adding proportion is more than or equal to 5 percent. A hydrogen loading ratio of less than 5% has a limited effect on the pipeline and the end user. The thermal efficiency of the natural gas internal combustion engine is increased after the natural gas is mixed with hydrogen, but the total amount of generated heat is reduced. The natural gas internal combustion engine is limited to the hydrogen loading ratio of less than or equal to 2 percent, and the maximum possible ratio is about 10 percent. For the influence of other downstream industrial users, no system detailed evaluation result exists on the global scale at present.

The netherlands enterprise SoluForce developed a wrappable reinforced thermoplastic industrial piping system (RTP, also known as FCP) for hydrogen applications. The SoluForce FCP is certified for hydrogen applications at operating pressures up to 42 bar, which is unique in the field of hydrogen transportation. Compared with a steel pipeline, the solution of the ready-to-use flexible pipeline is expected to greatly promote the large-scale application of the green hydrogen. The SoluForce flexible hydrogen pipeline scheme solves the most critical problems of high installation cost and hydrogen damage of the traditional steel pipeline. The SoluForce in 2000 first arranged a SoluForce flexible composite pipe solution in the middle east, and these pipes are still in use. At present, soluForce has installed over 3500 kilometers of flexible pipe worldwide, and has undergone extensive field validation in a variety of applications, including oil and gas utility pipelines, water distribution/injection pipelines, oil and gas transmission flow lines, and oil and gas collection lines.

The international experiences provide a key direction and path for the traditional oil and gas industry of China to participate in the hydrogen energy industry and realize low-carbon transformation.

The utility model mainly provides a system for one set of mixed transport hydrogen and terminal hydrogen-mixing to current natural gas line, the domestic current natural gas line of make full use of.

SUMMERY OF THE UTILITY MODEL

Based on the influence to pipeline material, compressor and pipe fitting etc. after mixing hydrogen, to the influence of downstream users such as resident, gas turbine and internal-combustion engine, reveal with the influence of operation safety etc. to the pipeline, the utility model provides an utilize natural gas line to mix hydrogen feeding device, hydrogen mixing device and distribution system, effectively utilize current natural gas line, realize hydrogen gas source from the transportation, mix the use that supplies with user terminal, realize the preferential utilization to current pipeline, reduce the cost of defeated hydrogen fortune hydrogen, and can improve the hydrogen mixing proportion, have the promotion meaning to the development of hydrogen energy.

The utility model adopts the following technical scheme: a hydrogen mixing and conveying device utilizing a natural gas pipeline comprises the natural gas pipeline, wherein a hydrogen pipeline is arranged in the natural gas pipeline; the tail end of the natural gas pipeline is sealed, and a natural gas outlet branch pipe is arranged on the side wall of the natural gas pipeline.

Further, still include the manometer of supplying gas, supply gas governing valve and the flowmeter of supplying gas, supply gas manometer, supply gas governing valve, supply gas flowmeter, hydrogen pipeline connect gradually.

Furthermore, a hydrogen purity meter is installed at the outlet of the natural gas pipeline.

Furthermore, the hydrogen pipeline inside the natural gas pipeline is single or many, and the pipe diameter can be the same or different when many hydrogen pipelines.

Furthermore, the hydrogen pipeline adopts a flexible pipeline.

Further, the pipe diameter of the hydrogen pipeline is less than or equal to 60% of the pipe diameter of the natural gas pipeline.

Further, the pressure in the hydrogen pipeline is less than or equal to the pressure in the natural gas pipeline.

Further, the pressure difference between the pressure in the hydrogen pipeline and the pressure in the natural gas pipeline is less than or equal to 20%.

The utility model also provides a hydrogen-loading device, which comprises the natural gas pipeline mixing hydrogen-feeding device and the hydrogen-loading mixer, wherein the hydrogen-loading mixer is arranged at the tail end of the natural gas pipeline mixing hydrogen-feeding device; the hydrogen-mixing mixer comprises a first air inlet pipe, a conical injection nozzle, a second air inlet pipe, an air outlet pipe, a mixing barrel, a plurality of cylindrical barrels and a plurality of small guide pipes, wherein the first air inlet pipe and the second air inlet pipe are respectively used for inputting natural gas and hydrogen; the inner layer of the mixing cylinder is uniformly distributed with a plurality of small guide pipes, the small guide pipes are communicated with the outer layer of the mixing cylinder, and each small guide pipe is provided with a plurality of air outlet holes.

Furthermore, the first air inlet pipe and the first air outlet pipe are distributed along the same axis; the two air inlet pipes are symmetrically distributed on the left side and the right side of the first air inlet pipe, and the small guide pipes are uniformly distributed along the left side and the right side of the first air inlet pipe on the inner layer of the mixing cylinder body and are obliquely arranged towards the direction of the air outlet pipe.

Furthermore, the hydrogen loading device also comprises a neck-shaped throat pipe and a conical nozzle, the other end of the inner layer of the mixing cylinder, which corresponds to the first air inlet pipe, is sequentially connected with the conical nozzle and the air outlet pipe, and the neck-shaped throat pipe with a narrow middle part and wide two ends is arranged in the conical nozzle.

The utility model also provides a distribution system contains foretell hydrogen-blending device, check valve one, stop valve two, stop valve three, flowmeter one, flowmeter two, flowmeter three, manometer, governing valve one and governing valve two, the natural gas is in proper order through check valve one, stop valve one, flowmeter one, in the intake pipe one that governing valve one got into the hydrogen-blending blender, hydrogen is in the intake pipe two that check valve two, stop valve two, governing valve two, flowmeter two got into the hydrogen-blending blender, and the mist of hydrogen-blending blender output exports for the user through stop valve three, manometer, flowmeter three.

Furthermore, the distribution system also comprises an independently arranged safety monitoring system which is used for monitoring the internal pressure and the hydrogen content of the system in the transmission process of the natural gas and the hydrogen and outputting early warning information.

Adopt the technical scheme of the utility model, the beneficial effects of the utility model are that:

(1) The hydrogen pipeline is laid by utilizing the existing natural gas pipeline, extra large engineering rewiring is not needed, the operability is strong, the installation and the expansion are easy, the original pipeline is not greatly improved, the cost of newly-built hydrogen pipelines is greatly reduced, and the hydrogen and the natural gas are separated and simultaneously transported and transmitted by the same line; the hydrogen pipeline is wrapped by the natural gas pipeline of the outer ring, so that hydrogen cannot be directly leaked into the air even if the hydrogen is leaked, the leakage amount of the hydrogen is reduced to the maximum extent, and the hydrogen leakage monitoring is facilitated to be enhanced; the hydrogen transportation capacity can be expanded by adjusting the size of the hydrogen pipeline or directly increasing the number of the hydrogen pipelines, and is not limited by the hydrogen doping proportion of a terminal user;

(2) Hydrogen and natural gas are respectively input into a hydrogen-mixing mixer, and the pressure difference principle of a Venturi tube is utilized to ensure that the gas is fully mixed and small internal resistance loss is ensured at the same time; through the cooperation of the safety monitoring system with various valves, instruments and the like, the running information and the state of the system can be accurately determined, and the hydrogen mixing proportion and the like are monitored, displayed, controlled and transmitted to a user side in real time;

(3) Adopt the utility model discloses a device can be applied to other two kinds of mixable gas transmission beyond natural gas and the hydrogen, has and uses nimble simple, installation maintenance cost low, but wide application in fields such as gas transmission and mixture, and it is strong to popularize the reproducibility.

Drawings

FIG. 1 is a schematic diagram of the process of hydrogen transportation by natural gas pipeline mixing of the present invention;

FIG. 2 is a schematic diagram of a hybrid hydrogen plant utilizing a natural gas pipeline;

FIG. 3a is a schematic cross-sectional view of a first hybrid hydrogen transport device using a natural gas pipeline;

FIG. 3b is a schematic cross-sectional view of a second hybrid hydrogen transport device utilizing a natural gas pipeline;

FIG. 3c is a schematic pipeline cross-sectional view of a third hybrid hydrogen transport apparatus using a natural gas pipeline;

FIG. 4 is a schematic cross-sectional view of a terminal end of a natural gas pipeline hybrid hydrogen delivery device;

FIG. 5 is a schematic view of a hydrogen loading apparatus;

fig. 6 is a schematic diagram of a dispensing system.

In the figure: 1 air supply pressure gauge, 2 air supply adjusting valve, 3 air supply flow meter, 4 hydrogen pipeline, 5 natural gas pipeline, 51 natural gas outlet branch pipe, 6 hydrogen mixing mixer, 61 inlet pipe I, 62 conical injection nozzle, 63 inlet pipe II, 64 outlet pipe, 65 mixing barrel, 651 mixing barrel inner layer, 652 mixing barrel outer layer, 66 conical nozzle, 67 small conduit, 68 neck-shaped throat, 7 safety monitoring system, 8 check valve I, 9 check valve I, 10 check valve II, 11 check valve III, 12 flow meter I, 13 flow meter II, 14 flow meter III, 15 pressure gauge, 16 adjusting valve I, 17 adjusting valve II, 18 check valve II.

Detailed Description

The specific embodiments of the present invention will be further explained with reference to the drawings, so that the technical solutions will be more clear and understood. Other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

The embodiment provides an equipment that utilizes current natural gas pipeline to carry out hydrogen transportation to and mix hydrogen and natural gas and finally transmit for user terminal and use, realize the priority utilization to current pipeline, reduce defeated hydrogen fortune hydrogen cost, and can improve the hydrogen proportion, it has the promotion meaning to the development of hydrogen energy. As shown in fig. 1, hydrogen is delivered by a natural gas pipeline mixing hydrogen delivery device, then the hydrogen and natural gas are mixed by a hydrogen loading device, and finally the mixed gas is delivered to a user.

As shown in fig. 2, a hydrogen delivery device using natural gas pipeline mixing includes an existing natural gas pipeline 5, a hydrogen pipeline 4 is disposed in the natural gas pipeline 5, a transmission tail end of the natural gas pipeline 5 is sealed, a natural gas outlet branch pipe 51 is opened on a side wall of the natural gas pipeline 5, and the hydrogen pipeline 4 continues to transmit along an axial direction of the natural gas pipeline, as shown in fig. 4.

In order to monitor the hydrogen conveying state, the hydrogen conveying device further comprises an air supply pressure gauge 1, an air supply adjusting valve 2 and an air supply flowmeter 3, wherein the air supply pressure gauge 1, the air supply adjusting valve 2, the air supply flowmeter 3, the hydrogen pipeline 4 and the natural gas pipeline 5 are sequentially connected, and hydrogen enters the hydrogen pipeline 4 to be transmitted after the detection control of the air supply pressure gauge 1, the air supply adjusting valve 2 and the air supply flowmeter 3. The overlapped part of the hydrogen pipeline and the natural gas pipeline is sealed, and the natural gas and the hydrogen at the transportation terminal are separated in two paths.

The hydrogen gas pipeline 4 inside the natural gas pipeline 5 may be single or multiple, and the pipe diameters of the multiple hydrogen gas pipelines may be set to be the same or different.

As shown in fig. 3a, a hydrogen pipeline 4 with a small diameter is directly placed in an original natural gas pipeline 5 for hydrogen transportation, and a natural gas pipeline with medium and low pressure is preferably selected, although a natural gas pipeline with high pressure can also be adopted. The hydrogen conveying pipeline is preferably a flexible pipeline, such as a TCP thermoplastic glass fiber hydrogen conveying pipeline. Facilitating installation and deployment to the natural gas pipeline 5. Conventional rigid hydrogen transfer lines may of course also be used. The pressure in the hydrogen pipeline is less than or equal to the pressure in the natural gas pipeline.

As shown in fig. 3b, the diameter of the hydrogen pipeline may be increased according to the hydrogen transportation requirement, and the hydrogen pipeline 4 with a large diameter is directly inserted into the original natural gas pipeline 5 for hydrogen transportation, but in order to ensure the flexibility of installation and maintenance of hydrogen, the diameter of the hydrogen pipeline 4 needs to be maintained at 60% or less of the diameter of the natural gas pipeline 5.

According to the transportation demand or the later stage hydrogen uses different circuit demands, thereby also can increase pipeline transport capacity through changing hydrogen pipeline quantity, directly put into a plurality of hydrogen pipelines 4 in original natural gas pipeline 5 promptly and carry out hydrogen transportation, as shown in fig. 3 c.

Can directly shunt hydrogen pipeline and natural gas line at the pipeline transportation terminal, natural gas line 5 seals to go out to connect out on the gas outlet branch pipe 51 of follow side interface, hydrogen pipeline 4 then continues forward transmission. The separated hydrogen and natural gas pipelines are respectively connected with valves and are respectively communicated with a hydrogen mixer in the next working procedure, and finally, the outlet of the hydrogen mixer is connected with a user. The flow rates of hydrogen and natural gas can be adjusted by adjusting the valve opening, so that the hydrogen loading proportion can be controlled.

In a specific embodiment, the valves adopt ball valves, stop valves and the like as far as possible, and the pipeline connecting parts preferably adopt concave-convex/tongue-groove/trapezoid groove flanges and the like, so that hydrogen leakage is prevented.

In the hydrogen supply device, the pressure difference between the pressure in the hydrogen pipeline 4 and the pressure in the natural gas pipeline 5 is less than or equal to 20%.

In a specific embodiment, a flow meter, a purity meter and a pressure meter of hydrogen and natural gas are required to be respectively installed at a pipeline transportation terminal, and particularly, a hydrogen purity meter is installed at an outlet of a natural gas pipeline, so that the hydrogen leakage condition can be directly detected.

The principle of the pipeline mixed hydrogen transportation of the embodiment is as follows:

with the current system of mixing hydrogen directly carry out the bulk blending with hydrogen and natural gas different, this device mainly utilizes original natural gas line, sets up hydrogen pipeline in natural gas line, accomplishes that hydrogen and natural gas separately and transport with the pipeline simultaneously. Set up hydrogen pipeline in natural gas line, even hydrogen pipeline takes place to reveal slightly, firstly can in time measure and discover at the terminal, secondly the hydrogen pipeline of leaking is wrapped up by the natural gas line of outer loop, and hydrogen can directly not reveal the air in, furthest reduces revealing of hydrogen volume. Because the requirement difference of the back-end user to different hydrogen-loading ratios is larger, the quantitative mixing of the natural gas and the hydrogen gas in different ratios is controlled at the terminal according to the requirements of different mixing ratios, so that different hydrogen-loading ratios are adopted for different terminal users to be utilized, and the degree of freedom selection of the user is increased to the maximum extent.

As shown in fig. 5, the present embodiment further provides a hydrogen loading apparatus, which includes the above-mentioned natural gas pipeline mixing hydrogen supply apparatus and the hydrogen loading mixer 6, wherein the hydrogen loading mixer 6 is disposed at the end of the natural gas pipeline mixing hydrogen supply apparatus; the hydrogen-blending mixer 6 comprises a first air inlet pipe 61, a conical injection nozzle 62, a second air inlet pipe 63, an air outlet pipe 64, a mixing cylinder 65 and a plurality of small guide pipes 67, wherein the first air inlet pipe 61 and the second air inlet pipe 63 are respectively used for inputting natural gas and hydrogen, the mixing cylinder 65 adopts an inner-layer and outer-layer double-layer structure, the conical injection nozzle 62 is arranged at the tail end of the first air inlet pipe 61 extending into the inner layer 651 of the mixing cylinder, and the second air inlet pipe 63 is communicated with the outer layer 652 of the mixing cylinder; the inner layer 651 of the mixing cylinder is uniformly distributed with a plurality of small conduits 67, the small conduits 67 are communicated with the outer layer 652 of the mixing cylinder, and each small conduit 67 is provided with a plurality of air outlets.

In a specific embodiment, the first inlet pipe 61 and the second outlet pipe 64 are distributed along the same axis; the two air inlet pipes 63 are symmetrically distributed on the left side and the right side of the first air inlet pipe 61, and the small guide pipes 67 are uniformly distributed along the left side and the right side of the first air inlet pipe 61 of the inner layer 651 of the mixing cylinder body and are obliquely arranged towards the direction of the air outlet pipe 64.

In a specific embodiment, the hydrogen loading device further comprises a neck-shaped throat 68 and a conical nozzle 66, the other end of the inner layer 651 of the mixing cylinder body, which corresponds to the first air inlet pipe 61, is sequentially connected with the conical nozzle 66 and the air outlet pipe 64, and the neck-shaped throat 68 with a narrow middle part and wide two ends is arranged in the conical nozzle 66.

The working principle of the hydrogen filling device is as follows: the natural gas and the hydrogen respectively enter the hydrogen-mixing mixer, and the technology of the venturi tube is utilized to ensure that the gases are fully mixed and small internal resistance loss is ensured.

The utility model provides a distribution system, as shown in FIG. 6, contain aforementioned hydrogen loading device, check valve 8, stop valve 9, stop valve two 10, stop valve three 11, flowmeter 12, flowmeter two 13, flowmeter three 14, manometer 15, governing valve 16 and governing valve two 17 and safety monitoring system 7, these components all merge into an organic whole, and the materialization is in a closed area, the safety monitoring and the operation maintenance of being convenient for. The natural gas sequentially enters a first gas inlet pipe 61 of the hydrogen mixing mixer through a first check valve 8, a first stop valve 9, a first flowmeter 12 and a first regulating valve 16, the hydrogen enters a second gas inlet pipe 63 of the hydrogen mixing mixer through a second check valve 18, a second stop valve 10, a second regulating valve 17 and a second flowmeter 13, and mixed gas output by the hydrogen mixing mixer is output to a user through a third stop valve 11, a pressure gauge 15, a third flowmeter 14 and a gas outlet pipe 64.

R3 development board), and an audible and visual alarm unit. When hydrogen leaks in the closed operating room, the hydrogen safety monitoring system can sense the hydrogen content through the sensor part, and receives information such as the captured space hydrogen content through the background signal processing and control unit, so that analysis and judgment are performed, the information such as the space hydrogen content is displayed in real time, and alarm information is sent out when necessary, so that on-site maintenance can be performed in time, and the safe and stable operation of the system can be guaranteed. The UNO 8194is independently arranged on the safety monitoring system 7 and is used for monitoring the internal pressure and the hydrogen content of the system in the transmission process of natural gas and hydrogen and outputting various information such as early warning information. The safety monitoring system adopts a mature hydrogen-related system at the present stage, and is not described in detail. For example, various commercially available hydrogen monitoring alarm instruments, hydrogen leakage detectors, concentration monitoring systems, etc., such as the Arduino-based hydrogen safety monitoring system designed by the wang daolong of the huh and cat of the city, etc., which mainly comprises a driving circuit unit, a hydrogen leakage monitoring unit (MQ-8 gas sensor), a background signal processing and control unit (Arduino)

The distribution system monitors and displays the hydrogen mixing proportion and the like in real time through a safety monitoring system, various monitoring instruments and the like, and provides accurate system operation information for users.

In the distribution system, the functions are described as follows:

(1) The function of adjusting the hydrogen mixing proportion is realized as follows: the gas inflow of the hydrogen and the natural gas can be accurately controlled through a first adjusting valve, a second adjusting valve, a first flowmeter, a second flowmeter and a third flowmeter on the system, so that the mixing proportion is controlled.

(2) Gas backflow prevention: through the arrangement of the first check valve and the second check valve, gas backflow caused by external factors such as pressure difference of natural gas and hydrogen can be prevented;

(3) Safety protection: through the safety monitoring system, the conditions such as internal pressure and hydrogen content of the integrated distribution system are monitored timely, early warning signals are transmitted timely, and the safe operation of the whole hydrogen mixing system is ensured.

The utility model discloses put into the less hydrogen pipeline of size in original natural gas line, realize that the natural gas continues to transport in original big pipeline, hydrogen transports in inside small pipeline. The hydrogen pipeline and the direct flexible contact of natural gas line do not additionally weld, and the big gas pipeline is put into directly with small-size hydrogen pipeline during the installation, realizes convenient installation. If the hydrogen transportation amount needs to be increased, the size of the internal hydrogen pipeline can be adjusted. The pipeline transportation terminal and the user side connecting end are provided with a hydrogen mixing mixer for mixing according to the requirements of different users, and are also provided with a natural gas and hydrogen meter for measuring gas flow, purity, pressure and the like and finally sending the gas into the users.

The utility model discloses can be applicable to natural gas, hydrogen transportation pipeline, and the mixture of hydrogen and natural gas. However, the pipeline built into the natural gas pipeline is not limited to use for hydrogen gas transport, and any other two gases that can be mixed can be transported and mixed by this method. Such as shale gas, natural gas, and the like. As for the use of the hydrogen-loading mixer, the gas with smaller density flows into the pipeline from a part of two paths of gas, and the gas with larger density flows into the pipeline from the bottom. The utility model discloses a device and system have nimble simple, the installation advantage that the maintenance cost is low, but wide application in fields such as gas transmission and mixture, and the copyability that can promote is strong.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A mixed hydrogen conveying device by using a natural gas pipeline is characterized by comprising a natural gas pipeline, wherein a hydrogen pipeline is arranged in the natural gas pipeline;

the tail end of the natural gas pipeline is sealed, the hydrogen pipeline continues to extend forwards along the axial direction of the natural gas pipeline, and a natural gas outlet branch pipe is arranged on the side wall of the natural gas pipeline.

2. The device for mixing and feeding hydrogen by using the natural gas pipeline as claimed in claim 1, further comprising a gas-feeding pressure gauge, a gas-feeding regulating valve and a gas-feeding flow meter, wherein the gas-feeding pressure gauge, the gas-feeding regulating valve, the gas-feeding flow meter and the hydrogen pipeline are connected in sequence;

or a hydrogen purity meter is installed at the outlet of the natural gas pipeline.

3. A mixed hydrogen conveying device by using a natural gas pipeline as claimed in claim 1, wherein the number of the hydrogen pipelines in the natural gas pipeline is one or more, and the diameters of the hydrogen pipelines can be the same or different.

4. The mixed hydrogen conveying device by using the natural gas pipeline as claimed in claim 1, wherein the hydrogen pipeline is a flexible pipeline;

or the pipe diameter of the hydrogen pipeline is less than or equal to 60% of the pipe diameter of the natural gas pipeline.

5. A mixed hydrogen transportation device using natural gas pipeline according to claim 1, characterized in that the pressure inside the hydrogen pipeline is less than or equal to the pressure inside the natural gas pipeline;

alternatively, the pressure difference between the pressure inside the pipe of the hydrogen pipeline and the pressure inside the pipe of the natural gas pipeline is less than or equal to 20%.

6. A hydrogen loading apparatus comprising a natural gas pipeline mixing hydrogen supply apparatus according to any one of claims 1 to 5 and a hydrogen loading mixer provided at an end of the natural gas pipeline mixing hydrogen supply apparatus;

the hydrogen-mixing mixer comprises a first air inlet pipe, a conical injection nozzle, a second air inlet pipe, an air outlet pipe, a mixing barrel, a plurality of cylindrical barrels and a plurality of small guide pipes, wherein the first air inlet pipe and the second air inlet pipe are respectively used for inputting natural gas and hydrogen, the mixing barrel is of an inner-layer and outer-layer double-layer structure, the conical injection nozzle is arranged at the tail end of the first air inlet pipe extending into the inner layer of the mixing barrel, and the second air inlet pipe is communicated with the outer layer of the mixing barrel;

the inner layer of the mixing cylinder is uniformly distributed with a plurality of small pipes which are communicated with the outer layer of the mixing cylinder, and each small pipe is provided with a plurality of air outlets.

7. The hydrogen loading device according to claim 6, wherein the first inlet pipe and the second outlet pipe are distributed along the same axis;

the two air inlet pipes are symmetrically distributed on the left side and the right side of the first air inlet pipe, and the small guide pipes are uniformly distributed along the left side and the right side of the first air inlet pipe on the inner layer of the mixing cylinder body and are obliquely arranged towards the direction of the air outlet pipe.

8. The hydrogen loading device according to claim 6, further comprising a neck-shaped throat and a tapered nozzle, wherein the tapered nozzle and an air outlet pipe are sequentially connected to the inner layer of the mixing cylinder and the other end corresponding to the first air inlet pipe, and the neck-shaped throat with a narrow middle part and wide two ends is arranged in the tapered nozzle.

9. A distribution system, characterized by, contain the loading device of claim 6, check valve I, stop valve II, stop valve III, flowmeter I, flowmeter II, flowmeter III, manometer, governing valve I and governing valve II, natural gas gets into the intake pipe I of loading blender through check valve I, stop valve I, flowmeter I, governing valve I in proper order, hydrogen gets into the intake pipe II of loading blender through check valve II, stop valve II, governing valve II, flowmeter II, the mixed gas that the loading blender output exports for the user through stop valve III, manometer, flowmeter III.

10. The distribution system according to claim 9, further comprising a safety monitoring system independently installed for monitoring the internal pressure and hydrogen content of the system during the transmission of natural gas and hydrogen and outputting the warning information.

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