A natural gas hydrogen blending experimental system and control method thereof

Abstract

The present invention discloses a natural gas hydrogen blending experimental system and a control method thereof, which includes a natural gas source; a hydrogen source; a first experimental device; a second experimental device; a primary blending device, whose inlet is connected to the natural gas source and the hydrogen source respectively, and whose outlet is connected to the inlet of the first experimental device; a secondary blending device, whose inlet is connected to the hydrogen source and the outlet of the first experimental device respectively, and whose outlet is connected to the inlet of the second experimental device; a control terminal, which is respectively connected to the primary blending device, the secondary blending device, the first experimental device, and the second experimental device; the control terminal is used to receive operation instructions and output corresponding control signals. The primary blending device supplies gas to the first experimental device after blending hydrogen, and the gas after the primary blending device blends hydrogen is supplied to the second experimental device after secondary blending of hydrogen by the secondary blending device, so that different hydrogen blending ratio experiments can be performed on the two experimental devices at the same time, thereby improving the efficiency of the natural gas hydrogen blending experiment.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas hydrogen blending, and in particular to a natural gas hydrogen blending experimental system and a control method thereof. Background Art

[0002] Under the background of "dual carbon", renewable clean energy such as photovoltaic and wind power will usher in a period of rapid development, but photovoltaic and wind power have phased characteristics, and their large-scale development and application require supporting energy storage technology. The mass energy density of hydrogen is three times that of natural gas. It can be produced by electrolysis of water and is regarded as an ideal energy storage medium for coordinated development with photovoltaic and wind power. However, photovoltaic and wind power projects are often a certain distance away from urban energy terminals. How to solve the storage and transportation problem of hydrogen produced by photovoltaic and wind power is one of the problems that need to be solved urgently. Compared with oil and coal, natural gas is relatively clean and has been given the mission of being a transitional energy source. It will gradually replace oil and coal by 2030 and grow rapidly. The construction of natural gas infrastructure will also be continuously improved during this period. Among them, natural gas pipeline hydrogen blending refers to the use of existing natural gas pipelines to mix hydrogen and natural gas for transportation. If the existing natural gas pipelines are used to blend hydrogen to achieve large-scale, low-cost, and long-distance transportation of hydrogen, it can simultaneously solve the problems of unstable photovoltaic and wind power, difficult storage and transportation of hydrogen energy, and waste of natural gas infrastructure.

[0003] To realize the large-scale application of hydrogen blending in natural gas pipelines, it is necessary to conduct systematic and scientific experiments on the facilities used in the natural gas transmission and distribution system, and then formulate a targeted natural gas pipeline hydrogen blending plan. In the existing natural gas hydrogen blending experimental system, when multiple devices are tested simultaneously, the experimental equipment is directly connected in parallel at the outlet of the blending equipment, so that the existing technology can only conduct experiments with the same hydrogen blending ratio, and cannot conduct multiple natural gas pipeline hydrogen blending experiments with different hydrogen blending ratios at the same time, resulting in low experimental efficiency.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a natural gas hydrogen blending experimental system and a control method thereof in view of the above-mentioned defects of the prior art, aiming to realize simultaneous natural gas pipeline hydrogen blending experiments with multiple different hydrogen blending ratios and improve the experimental efficiency.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] A natural gas hydrogen blending experimental system, comprising a natural gas source, a hydrogen source, and further comprising:

[0008] First experimental equipment;

[0009] Second experimental equipment;

[0010] a primary blending device, the inlet of which is connected to the natural gas source and the hydrogen source respectively, and the outlet of which is connected to the inlet of the first experimental device;

[0011] A secondary blending device, whose inlet is connected to the hydrogen source and the outlet of the first experimental device respectively, and whose outlet is connected to the inlet of the second experimental device;

[0012] The control terminal is respectively connected to the primary blending device, the secondary blending device, the first experimental device and the second experimental device; the control terminal is used to receive operation instructions and output corresponding control signals.

[0013] The natural gas hydrogen blending experimental system further comprises:

[0014] A user end is connected to an outlet of the secondary blending device and an outlet of the second experimental device respectively;

[0015] A first valve is disposed between the outlet of the secondary blending device and the inlet of the user end and is connected to the control terminal;

[0016] a second valve connected to the control terminal;

[0017] The outlet of the primary mixing device is connected to the inlet of the secondary mixing device, and the second valve is arranged between the outlet of the primary mixing device and the inlet of the secondary mixing device.

[0018] The natural gas hydrogen blending experimental system further comprises:

[0019] A separation device, used for separating hydrogen and natural gas, and having a hydrogen output port and a tail gas output port; the inlet of the separation device is connected to the outlet of the primary blending device;

[0020] A proton membrane fuel cell connected to the hydrogen energy output port;

[0021] A solid oxide fuel cell is connected to the tail gas output port through a first pipeline.

[0022] The natural gas hydrogen blending experimental system further comprises:

[0023] A second pipeline, one end of which is connected between the outlet of the second experimental device and the user end, and the other end of which is connected to the first pipeline;

[0024] The reversing valve is arranged on the second pipeline.

[0025] The natural gas hydrogen blending experimental system, wherein the separation equipment comprises:

[0026] a primary separation device, the inlet of which is connected to the outlet of the primary blending device;

[0027] A pressurizing device, the inlet of which is connected to the outlet of the primary separation device;

[0028] The membrane separation device has an inlet connected to the outlet of the booster device and has the hydrogen energy output port and the tail gas output port.

[0029] The natural gas hydrogen blending experimental system further comprises:

[0030] The vertical riser layered experimental equipment is respectively connected to the exhaust gas outlet and the outlet of the second experimental equipment.

[0031] A control method for a natural gas hydrogen blending experimental system, wherein the control method comprises the following steps:

[0032] When the control terminal receives an operation instruction to carry out two hydrogen blending ratio experiments at the same time, the primary blending device, the secondary blending device, the first experimental device and the second laboratory device are all controlled to start;

[0033] Obtaining a natural gas flow rate output by a natural gas source and a hydrogen flow rate output by a hydrogen source, and calculating and judging whether a primary hydrogen blending ratio output by the primary blending device is equal to a preset primary hydrogen blending ratio, and whether a secondary hydrogen blending ratio output by the second blending device is equal to a preset secondary hydrogen blending ratio according to the natural gas flow rate and the hydrogen flow rate;

[0034] When the primary hydrogen doping ratio is not equal to the preset primary hydrogen doping ratio and / or the secondary hydrogen doping ratio is not equal to the preset secondary hydrogen doping ratio, the hydrogen flow rate is adjusted until the primary hydrogen doping ratio is equal to the preset primary hydrogen doping ratio and the secondary hydrogen doping ratio is equal to the preset secondary hydrogen doping ratio.

[0035] The control method further comprises the steps of:

[0036] When the control terminal receives the experimental equipment sampling and analysis operation instruction, it controls the first experimental equipment and the second experimental equipment to be closed, and controls the first valve and the second valve to be opened.

[0037] The control method, wherein the natural gas hydrogen blending experimental system further comprises a third valve, a fourth valve and a fifth valve connected to the control terminal; the third valve is arranged between the inlet of the separation device and the outlet of the primary blending device; the fourth valve is arranged between the outlet of the primary blending device and the inlet of the first experimental device; the fifth valve is arranged between the outlet of the separation device and the vertical riser layered experimental device;

[0038] The control method further comprises the steps of:

[0039] When the control terminal receives an operation instruction to simultaneously carry out two hydrogen doping ratio experiments, a proton membrane fuel cell experiment, and a solid oxide fuel cell experiment, the third valve, the fourth valve, the first experimental device, and the second experimental device are controlled to be opened, and the first valve, the second valve, the reversing valve, and the fifth valve are controlled to be closed;

[0040] Obtaining the exhaust gas treatment volume entering the separation device, and comparing the exhaust gas treatment volume with a preset exhaust gas supply volume;

[0041] When the exhaust gas treatment volume is less than the preset exhaust gas supply volume, the reversing valve is opened, and the opening of the fourth valve is controlled to increase, so that the hydrogen-blended natural gas output by the second experimental equipment is supplied to the solid oxide fuel cell after passing through the reversing valve.

[0042] The control method further comprises the steps of:

[0043] When the exhaust gas treatment volume is greater than the preset exhaust gas supply volume, the reversing valve is controlled to adjust direction, and the fifth valve is controlled to open, so that the exhaust gas output from the exhaust gas output port is supplied to the user end and the vertical riser stratified experimental equipment.

[0044] Beneficial effect: In the present application, the primary blending device and the secondary blending device are provided, and the hydrogen-blended natural gas obtained after hydrogen blending by the primary blending device is supplied to the first experimental device, and the hydrogen-blended natural gas obtained after hydrogen blending by the secondary blending device is supplied to the second experimental device, so that the first experimental device and the second experimental device can perform experiments at the same time, and the hydrogen blending ratios of the hydrogen-blended natural gases obtained by the two devices are different, thereby achieving the technical purpose of simultaneously performing experiments with different hydrogen blending ratios on the two experimental devices and improving the efficiency of natural gas hydrogen blending experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the natural gas hydrogen blending experimental system of the present invention;

[0046] Figure 2 It is a functional principle block diagram of the natural gas hydrogen blending experimental system described in the present invention;

[0047] Figure 3 It is a flow chart of a preferred embodiment of the control method of the natural gas hydrogen blending experimental system of the present invention;

[0048] Figure 4 It is a functional principle block diagram of the control terminal described in the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] The present invention provides a natural gas hydrogen blending experimental system, such as Figure 1 and Figure 2 As shown, the natural gas hydrogen blending experimental system includes: a natural gas source 1, a hydrogen source 2, a first experimental device 3, a second experimental device 4, a primary blending device 5, a secondary blending device 6 and a control terminal; the primary blending device 5 and the secondary blending device 6 are both used to blend hydrogen with natural gas, and output the hydrogen-blended natural gas obtained after blending. Specifically, the inlet of the primary blending device 5 is connected to the natural gas source 1 and the hydrogen source 2, respectively, so as to perform the first hydrogen blending and obtain the hydrogen-blended natural gas with the first hydrogen blending ratio; the outlet of the primary blending device 5 is connected to the inlet of the first experimental device 3, so as to supply the hydrogen-blended natural gas obtained after the first hydrogen blending to the first experimental device 3.

[0051] The inlet of the secondary blending device 6 is connected to the outlet of the hydrogen source 2 and the first experimental device 3, respectively, so that the hydrogen-blended natural gas obtained after the first hydrogen blending is output from the first experimental device 3 and then mixed with the hydrogen supplied by the hydrogen source 2 again for a second hydrogen blending to obtain hydrogen-blended natural gas with a second hydrogen blending ratio, and the second hydrogen blending ratio is not equal to the first hydrogen blending ratio, thereby obtaining hydrogen-blended natural gas with different hydrogen blending ratios. The outlet of the secondary blending device 6 is connected to the inlet of the second experimental device 4, so that the hydrogen-blended natural gas obtained after the second hydrogen blending is supplied to the second experimental device 4.

[0052] The control terminal is respectively connected to the primary blending device 5, the secondary blending device 6, the first experimental device 3 and the second experimental device 4; the control terminal is used to receive operation instructions and output corresponding control signals. When the control terminal receives an operation instruction to carry out two hydrogen blending ratio experiments at the same time, the control terminal controls the primary blending device 5, the secondary blending device 6, the first experimental device 3 and the second experimental device 4 to be turned on, the first experimental device 3 and the second experimental device 4 can carry out experiments at the same time, and the hydrogen blending ratio of the hydrogen-blended natural gas obtained by the first experimental device 3 is not equal to the hydrogen blending ratio of the hydrogen-blended natural gas obtained by the second experimental device 4.

[0053] In the present application, the primary blending device 5 and the secondary blending device 6 are arranged, and the hydrogen-blended natural gas obtained after being blended with hydrogen by the primary blending device 5 is supplied to the first experimental device 3, and the hydrogen-blended natural gas obtained after being blended with hydrogen by the secondary blending device 6 is supplied to the second experimental device 4, so that under the premise that the first experimental device 3 and the second experimental device 4 can conduct experiments at the same time, the hydrogen blending ratio of the hydrogen-blended natural gas obtained by the first experimental device 3 and the hydrogen blending ratio of the hydrogen-blended natural gas obtained by the second experimental device 4 are different, thereby achieving the technical purpose of conducting experiments with different hydrogen blending ratios on multiple experimental devices at the same time, and improving the efficiency of natural gas hydrogen blending experiments.

[0054] The natural gas hydrogen blending experimental system also includes a user end 7. The user end 7 is a user terminal; the user end 7 is respectively connected to the outlet of the secondary blending device 6; so that the hydrogen-blended natural gas output by the first experimental device 3 is supplied to the second experimental device 4 for use after the second hydrogen blending by the secondary blending device 6, and the hydrogen-blended natural gas output by the second experimental device 4 after use is completed is supplied to the user end 7 for use.

[0055] In one embodiment of the present application, the natural gas hydrogen blending experimental system further includes a first valve 8 and a second valve 9, both of which are connected to the control terminal. The user end 7 is also connected to the outlet of the secondary blending device 6, and the first valve 8 is arranged between the user end 7 and the outlet of the secondary blending device 6; the outlet of the primary blending device 5 is connected to the inlet of the secondary blending device 6, and the second valve 9 is arranged between the outlet of the primary blending device 5 and the inlet of the secondary blending device 6.

[0056] The first valve 8 is used to control whether the hydrogen-blended natural gas output by the secondary blending equipment 6 is directly delivered to the user end 7 instead of being supplied to the second experimental equipment 4; the second valve 9 is used to control whether the hydrogen-blended natural gas output by the primary blending equipment 5 is directly delivered to the secondary blending equipment 6 instead of being supplied to the first experimental equipment 3.

[0057] In one implementation of the present embodiment, when the control terminal receives an operation instruction to carry out two hydrogen blending ratio experiments at the same time, the control terminal controls both the first valve 8 and the second valve 9 to be closed, so that the hydrogen-blended natural gas with the first hydrogen blending ratio is supplied to the first experimental equipment 3, and the hydrogen-blended natural gas with the second hydrogen blending ratio is supplied to the second experimental equipment 4.

[0058] In another implementation manner of the present embodiment, when the control terminal receives an operation instruction for sampling and analysis of experimental equipment, it is necessary to perform sampling and analysis on the first experimental equipment 3 and the second experimental equipment 4. Then, the control terminal controls the first experimental equipment 3 and the second experimental equipment 4 to be closed, and controls the first valve 8 and the second valve 9 to be opened, so as to perform sampling and analysis on the first experimental equipment 3 and the second experimental equipment 4 while ensuring the normal gas use of the user end 7 downstream.

[0059] In one embodiment of the present application, the first experimental equipment 3 has the same structure as the second experimental equipment 4; wherein the first experimental equipment 3 includes a valve experimental fixture 100, a metering instrument fixture 101, a first pipeline 38 experimental fixture 102 and a second pipeline 24 experimental fixture 103 connected in parallel.

[0060] In one embodiment of the present application, the natural gas hydrogen blending experimental system further includes: a hydrogen gas collecting column 11, a natural gas filter 12 and a hydrogen filter 13; the inlet of the hydrogen gas collecting column 11 is connected to the hydrogen source 2, the first outlet 111 of the hydrogen gas collecting column 11 is connected to the inlet of the primary blending device 5, and the second outlet 112 of the hydrogen gas collecting column 11 is connected to the inlet of the secondary blending device 6. The natural gas filter 12 is disposed between the natural gas source 1 and the inlet of the primary blending device 5, and is used to filter the natural gas supplied to the primary blending device 5. The hydrogen filter 13 is disposed between the hydrogen source 2 and the inlet of the hydrogen gas collecting column 11, and is used to filter the hydrogen supplied to the hydrogen gas collecting column 11.

[0061] A first stop valve 14 and a first ball valve 15 are connected in series between the first outlet 111 and the inlet of the primary blending device 5; a second stop valve 16 and a second ball valve 17 are connected in series between the second outlet 112 and the inlet of the secondary blending device 6. The first stop valve 14, the first ball valve 15, the second stop valve 16 and the second ball valve 17 are all connected to the control terminal.

[0062] The natural gas hydrogen blending experimental system also includes: a primary hydrogen blending gas collecting column 18 and a secondary hydrogen blending gas collecting column 19; the inlet of the primary hydrogen blending gas collecting column 18 is connected to the outlet of the primary blending device 5, and the outlet is connected to the inlet of the first experimental device 3 and the secondary blending device 6; the second valve 9 is arranged on the pipeline connecting the outlet of the primary hydrogen blending gas collecting column 18 with the inlet of the secondary blending device 6. The inlet of the secondary hydrogen blending gas collecting column 19 is connected to the outlet of the secondary blending device 6, and the outlet is connected to the second experimental device 4 and the user end 7 respectively; the first valve 8 is arranged on the pipeline connecting the outlet of the secondary hydrogen blending gas collecting column 19 with the user end 7.

[0063] The natural gas hydrogen blending experimental system also includes: a separation device 21, a proton membrane fuel cell 22 and a solid oxide fuel cell 23. The separation device 21 is used to separate hydrogen and natural gas to obtain pure hydrogen and tail gas; the tail gas is hydrogen-blended natural gas containing a small amount of hydrogen; the separation device 21 has a hydrogen energy output port 200 and a tail gas output port 201, wherein the hydrogen energy output port 200 is used to output pure hydrogen, and the tail gas output port 201 is used to output tail gas.

[0064] The inlet of the separation device 21 is connected to the outlet of the primary mixing device 5, the hydrogen energy output port 200 is connected to the proton membrane fuel cell 22, and the exhaust gas output port 201 is connected to the solid oxide fuel cell 23 through the first pipeline 38, so that pure hydrogen is provided to the proton membrane fuel cell 22 through the separation device 21, and exhaust gas is provided to the solid oxide fuel cell 23, so as to facilitate the simultaneous conduct of proton membrane fuel cell experiments and solid oxide fuel cell experiments.

[0065] The natural gas hydrogen blending experimental system further includes a second pipeline 24 and a reversing valve 25; one end of the second pipeline 24 is connected between the outlet of the second experimental device 4 and the user end 7, and the other end is connected to the first pipeline 38. Specifically, one end of the second pipeline 24 is connected to the pipeline connecting the outlet of the second experimental device 4 and the user end 7, and the other end is connected to the first pipeline 38, so as to form a passage between the first pipeline 38 and the pipeline connecting the outlet of the second experimental device 4 and the user end 7.

[0066] The reversing valve 25 is disposed on the second pipeline 24 to adjust the direction of the airflow in the second pipeline 24 to achieve: the outlet of the second experimental device 4 supplies gas to the solid oxide fuel cell 23, or the outlet of the separation device 21 supplies gas to the user end 7.

[0067] In one embodiment of the present application, when the gas supply from the separation device 21 to the solid oxide fuel cell 23 exceeds the amount required by the solid oxide fuel cell 23, the flow direction of the reversing valve 25 needs to be adjusted to: the outlet of the separation device 21 supplies gas to the user end 7. When the gas supply from the separation device 21 to the solid oxide fuel cell 23 does not reach the amount required by the solid oxide fuel cell 23, the flow direction of the reversing valve 25 needs to be adjusted to: the outlet of the second experimental device 4 supplies gas to the solid oxide fuel cell 23, thereby supplementing the gas supply to the solid oxide fuel cell 23.

[0068] The separation equipment 21 includes: a primary separation device 211, a boosting device 212 and a membrane separation device 213; the primary separation device 211, the boosting device 212 and the membrane separation device 213 are connected in series in sequence; the inlet of the primary separation device 211 is connected to the outlet of the primary mixing device 5, and the outlet of the primary separation device 211 is connected to the inlet of the boosting device 212 and is also connected to the first pipeline 38, so that the solid oxide fuel cell 23 is provided with natural gas containing a certain amount of hydrogen through the first pipeline 38.

[0069] The membrane separation device 213 has the hydrogen energy output port 200 and the exhaust gas output port 201; the hydrogen energy output port 200 is connected to the proton membrane fuel cell 22, thereby providing pure hydrogen to the proton membrane fuel cell 22; the exhaust gas output port 201 is connected to the first pipeline 38, thereby providing exhaust gas to the solid oxide fuel cell 23 through the first pipeline 38.

[0070] The natural gas hydrogen blending experimental system further includes a vertical riser stratification experimental device 26, which is respectively connected to the tail gas outlet 201 and the outlet of the second experimental device 4. In one embodiment of the present application, the inlet of the vertical riser stratification experimental device 26 is respectively connected to the outlet of the first pipeline 38 and the second experimental device 4, so as to supply gas to the vertical riser stratification experimental device 26 through the separation device 21 and the second experimental device 4.

[0071] In one embodiment of the present application, a third ball valve 41 and a first shut-off valve 42 are connected in series between the natural gas source 1 and the primary blending device 5; a fourth ball valve 43 and a second shut-off valve 44 are connected in series between the hydrogen source 2 and the hydrogen gas collecting column 11; a fifth ball valve 45, a third shut-off valve 46 and a pressure regulating valve 47 are connected in series between the outlet of the primary blending device 5 and the inlet of the separation device 21; a sixth ball valve 48 is connected between the outlet of the second experimental device 4 and the inlet of the vertical riser stratified experimental device 26; a seventh ball valve 49 and a fourth shut-off valve 50 are connected in series at the inlet of the vertical riser stratified experimental device 26; an eighth ball valve 51 and a fifth shut-off valve 52 are connected in series at the inlet of the user end 7. The first pipeline 38 is also connected in series with a ninth ball valve 53 and a sixth stop valve 54; the tail gas output from the primary separation device 211 and the tail gas output from the tail gas output port 201 pass through the ninth ball valve 53 and the sixth stop valve 54 in sequence and then enter the solid oxide fuel cell 23 and / or the second pipeline 24. A tenth ball valve 55 is also provided between the outlet of the secondary blending device 6 and the inlet of the secondary hydrogen blending gas collecting column 19. The outlet of the second experimental device 4 is also connected with an eleventh ball valve 56, which is connected in parallel with the first valve 8. All of the above ball valves, stop valves, cut-off valves and pressure regulating valves are connected to the control terminal.

[0072] Based on any of the above natural gas hydrogen blending experimental systems, the present application also provides a control method for the natural gas hydrogen blending experimental system, such as Figure 3 As shown, the control method comprises the following steps:

[0073] S100, when the control terminal receives an operation instruction to carry out two hydrogen blending ratio experiments at the same time, the primary blending device, the secondary blending device, the first experimental device and the second experimental device are all controlled to start;

[0074] Specifically, the control terminal receives an operation instruction and determines what kind of operation instruction the received operation instruction is; the operation instruction includes: simultaneously conducting two hydrogen doping ratio experiments, sampling and analysis of experimental equipment, and simultaneously conducting two hydrogen doping ratio experiments, proton membrane fuel cell experiments and solid oxide fuel cell experiments.

[0075] Initially, the primary blending device 5, the secondary blending device 6, the first experimental device 3 and the second experimental device 4 are all closed; when the control terminal receives an operation instruction to carry out two hydrogen blending ratio experiments at the same time, the primary blending device 5, the secondary blending device 6, the first experimental device 3 and the second experimental device 4 are all controlled to be turned on. The primary blending device 5 blends the hydrogen and natural gas output by the hydrogen source 2 and the natural gas source 1 to obtain natural gas with a primary hydrogen blending ratio, and supplies it to the first experimental device 3; the secondary blending device 6 blends the hydrogen and hydrogen-blended natural gas output by the hydrogen source 2 and the first experimental device 3 to obtain natural gas with a secondary hydrogen blending ratio, and supplies it to the second experimental device 4. The first experimental device 3 uses the natural gas with the primary hydrogen blending ratio for experiments, and the second experimental device 4 uses the natural gas with the secondary hydrogen blending ratio for experiments, thereby realizing the simultaneous implementation of two different hydrogen blending ratios for adaptability experiments of pipelines and components, thereby improving experimental efficiency.

[0076] At the same time, the hydrogen-blended natural gas outputted from the second experimental equipment 4 enters the vertical riser stratification experimental equipment 26, and the vertical riser stratification experiment is carried out simultaneously.

[0077] S200, obtaining the natural gas flow rate output by the natural gas source and the hydrogen flow rate output by the hydrogen source, and calculating and judging whether the primary hydrogen blending ratio output by the primary blending device is equal to the preset primary hydrogen blending ratio according to the natural gas flow rate and the hydrogen flow rate, and whether the secondary hydrogen blending ratio output by the second blending device is equal to the preset secondary hydrogen blending ratio;

[0078] Specifically, a natural gas flow meter 27 is also connected between the outlet of the natural gas source 1 and the inlet of the primary blending device 5; a hydrogen flow meter 28 and a hydrogen flow regulating valve 29 are connected in series between the hydrogen source 2 and the inlet of the hydrogen gas collecting column 11; the natural gas flow meter 27, the hydrogen flow meter 28 and the hydrogen flow regulating valve 29 are all connected to the control terminal. The natural gas flow meter 27 is used to obtain the flow of the natural gas output by the natural gas source 1; the hydrogen flow meter 28 is used to obtain the flow of the hydrogen output by the hydrogen source 2 (i.e., the flow of hydrogen entering the primary blending device 5 and the flow of hydrogen entering the secondary blending device 6), and the hydrogen flow regulating valve 29 is used to adjust the flow of the hydrogen output by the hydrogen source 2.

[0079] After the control terminal obtains the natural gas flow rate output by the natural gas source 1 and the hydrogen flow rate output by the hydrogen source 2 through the natural gas flow meter 27 and the hydrogen flow meter 28, the control terminal calculates the primary hydrogen blending ratio output by the primary blending device 5 and the secondary hydrogen blending ratio output by the secondary blending device 6 according to the natural gas flow rate and the hydrogen flow rate. The hydrogen blending ratio of the hydrogen-blended natural gas required by the first experimental device 3 is the preset primary hydrogen blending ratio, and the hydrogen blending ratio of the hydrogen-blended natural gas required by the second experimental device 4 is the preset second hydrogen blending ratio; the control terminal compares the primary hydrogen blending ratio with the preset primary hydrogen blending ratio, and compares the secondary hydrogen blending ratio with the preset secondary hydrogen blending ratio, and determines whether the primary hydrogen blending ratio is equal to the preset primary hydrogen blending ratio, and whether the secondary hydrogen blending ratio is equal to the preset secondary hydrogen blending ratio.

[0080] S300. When the primary hydrogen doping ratio is not equal to the preset primary hydrogen doping ratio and / or the secondary hydrogen doping ratio is not equal to the preset secondary hydrogen doping ratio, adjust the hydrogen flow rate until the primary hydrogen doping ratio is equal to the preset primary hydrogen doping ratio and the secondary hydrogen doping ratio is equal to the preset secondary hydrogen doping ratio.

[0081] Regardless of whether the primary hydrogen blending ratio is not equal to the preset primary hydrogen blending ratio, or the secondary hydrogen blending ratio is not equal to the preset secondary hydrogen blending ratio, the natural gas flow rate and / or the hydrogen flow rate need to be adjusted. In one embodiment of the present application, when the primary hydrogen blending ratio is less than the preset primary hydrogen blending ratio, the control terminal controls the valve opening of the hydrogen flow regulating valve 29 to increase until the primary hydrogen blending ratio is equal to the preset primary hydrogen blending ratio; when the primary hydrogen blending ratio is greater than the preset primary hydrogen blending ratio, the control terminal controls the valve opening of the hydrogen flow regulating valve 29 to decrease until the primary hydrogen blending ratio is equal to the preset primary hydrogen blending ratio. Similarly, when the secondary hydrogen blending ratio is not equal to the preset secondary hydrogen blending ratio, the valve opening of the hydrogen flow regulating valve 29 is adjusted until the secondary hydrogen blending ratio is equal to the preset secondary hydrogen blending ratio.

[0082] A natural gas pressure detector 31 and a natural gas pressure regulating valve 39 are also connected in series between the outlet of the natural gas source 1 and the inlet of the primary blending device 5. A hydrogen pressure detector 32 and a hydrogen pressure regulating valve 33 are also connected in series between the outlet of the hydrogen source 2 and the inlet of the hydrogen gas collecting column 11. The natural gas pressure detector 31, the natural gas pressure regulating valve 39, the hydrogen pressure detector 32 and the hydrogen pressure regulating valve 33 are all connected to the control terminal. The natural gas pressure detector 31 is used to detect the natural gas pressure value output by the natural gas source 1, the hydrogen pressure detector 32 is used to detect the hydrogen pressure value output by the hydrogen source 2, the hydrogen pressure regulating valve 33 is used to regulate the hydrogen pressure value in the outlet pipeline of the hydrogen source 2, and the natural gas pressure regulating valve is used to regulate the natural gas pressure value in the outlet pipeline of the natural gas source 1.

[0083] Before step S200, the following steps are also included:

[0084] The control terminal obtains the natural gas pressure value output by the natural gas source 1 through the natural gas pressure detector, and obtains the hydrogen pressure value output by the hydrogen source through the hydrogen pressure detector;

[0085] The natural gas pressure value and the hydrogen pressure value are compared. When the natural gas pressure value is greater than the hydrogen pressure value, the control terminal controls the valve opening of the hydrogen pressure regulating valve to increase the pressure of the hydrogen; when the natural gas pressure value is less than the hydrogen pressure value, the control terminal controls the valve opening of the hydrogen pressure regulating valve to decrease the pressure of the hydrogen.

[0086] The control method further comprises the steps of:

[0087] When the control terminal determines that the received operation instruction is for sampling and analyzing the experimental equipment, the first experimental equipment and the second experimental equipment are controlled to be closed, and the first valve and the second valve are controlled to be opened.

[0088] In one embodiment of the present application, when the control terminal determines that the received operation instruction is for sampling and analysis of experimental equipment, the first experimental equipment 3 and the second experimental equipment 4 are controlled to be closed, and sampling and analysis are performed on the first pipeline 38 experimental tooling device and / or the second pipeline 24 experimental tooling device of the first laboratory equipment, and sampling and analysis are performed on the first pipeline 38 experimental tooling device and / or the second pipeline 24 experimental tooling device of the second experimental equipment 4. Since the first valve 8 and the second valve 9 are both open, the hydrogen-blended natural gas with a secondary hydrogen blending ratio output by the secondary blending device 6 can be normally used by the user end 7, so that sampling and analysis of the experimental pipe section can be achieved while ensuring the normal gas use of the downstream user end 7.

[0089] The natural gas hydrogen blending experimental system also includes a third valve 34, a fourth valve 35 and a fifth valve 36 connected to the control terminal; the third valve 34 is arranged between the inlet of the separation device 21 and the outlet of the primary blending device 5, and is used to control the opening, closing and flow rate of the gas supply from the primary blending device 5 to the separation device 21. The fourth valve 35 is arranged between the outlet of the primary blending device 5 and the inlet of the first experimental device 3, specifically, the fourth valve 35 is arranged between the outlet of the primary blending device 5 and the inlet of the primary hydrogen blending gas collecting column 18, and is used to control the opening, closing and flow rate of the gas supply from the primary blending device 5 to the primary hydrogen blending gas collecting column 18. The fifth valve 36 is arranged between the outlet of the separation device 21 and the inlet of the vertical riser layered experimental device 26, specifically, the fifth valve 36 is connected to the first pipeline 38 and the vertical riser layered experimental device 26 respectively, and is used to control the opening and closing of the gas supply from the first pipeline 38 to the vertical riser layered experimental device 26.

[0090] In one embodiment of the present application, the first valve 8 , the second valve 9 , the third valve 34 , the fourth valve 35 and the fifth valve 36 are all ball valves.

[0091] The control method further comprises the steps of:

[0092] S400, when the control terminal receives an operation instruction to simultaneously carry out two hydrogen doping ratio experiments, a proton membrane fuel cell experiment, and a solid oxide fuel cell experiment, the third valve, the fourth valve, the first experimental device, and the second experimental device are controlled to be opened, and the first valve, the second valve, the reversing valve, and the fifth valve are controlled to be closed;

[0093] Specifically, the control terminal controls the third valve 34 and the fourth valve 35 to open, and the primary blending device 5 supplies gas to the separation device 21 and the primary hydrogen-doped gas collecting column 18 respectively; the control terminal controls the first experimental equipment 3 and the second experimental equipment 4 to open, and controls the first valve 8, the second valve 9, the reversing valve 25 and the fifth valve 36 to close, then the primary hydrogen-doped gas collecting column 18 supplies gas to the first experimental equipment 3, the hydrogen-doped natural gas output by the first experimental equipment 3 is secondary-doped with hydrogen by the secondary blending device 6, and then output to the second experimental equipment 4, and finally the hydrogen-doped natural gas with the secondary hydrogen-doping ratio output by the second experimental equipment 4 is supplied to the downstream user end 7 for use.

[0094] The pure hydrogen output from the hydrogen energy output port 200 is supplied to the proton membrane fuel cell 22 for use, so as to carry out a proton membrane fuel cell experiment; the tail gas output from the primary separation device 211 and the tail gas output from the tail gas output port 201 are supplied to the solid oxide fuel cell 23 for use, so as to carry out a solid oxide fuel cell experiment; the hydrogen-blended natural gas output from the second experimental equipment 4 is also supplied to the vertical riser stratification experimental device, so as to carry out a vertical riser stratification experiment, so as to realize the simultaneous implementation of two hydrogen blending ratio experiments, a proton membrane fuel cell experiment, a solid oxide fuel cell experiment and a vertical riser stratification experiment.

[0095] S500, obtaining the exhaust gas treatment amount entering the separation device, and comparing the exhaust gas treatment amount with a preset exhaust gas supply amount;

[0096] Specifically, a flow meter 37 is connected between the outlet of the primary blending device 5 and the inlet of the separation device 21. The flow meter 37 is connected to the control terminal and is used to detect the gas flow supplied from the primary blending device 5 to the separation device 21, that is, the exhaust gas treatment amount entering the separation device 21.

[0097] The exhaust gas supply required by the solid oxide fuel cell 23 is defined as a preset exhaust gas supply. The control terminal compares the exhaust gas treatment amount with the preset exhaust gas treatment amount to determine whether the exhaust gas treatment amount supplied by the separation device 21 to the solid oxide fuel cell 23 matches the exhaust gas supply required by the solid oxide fuel cell 23, thereby determining whether it is necessary to adjust the natural gas hydrogen blending experimental system based on the comparison result to achieve a match (equality) between the amount of hydrogen-blended natural gas entering the solid oxide fuel cell 23 and the preset exhaust gas treatment amount.

[0098] S600, when the exhaust gas treatment volume is less than the preset exhaust gas supply volume, the reversing valve is opened, and the flow direction of the gas supply of the reversing valve is ensured to be: the second experimental device supplies gas to the solid oxide fuel cell, so that the hydrogen-doped natural gas output by the second experimental device is supplied to the solid oxide fuel cell after passing through the reversing valve. The control terminal controls the opening of the fourth valve to increase, increase the amount of hydrogen-doped natural gas passing into the primary hydrogen-doped gas collecting column, thereby increasing the gas supply to the solid oxide fuel cell to meet the gas supply required by the solid oxide fuel cell experiment.

[0099] S700. When the exhaust gas treatment volume is greater than the preset exhaust gas supply volume, the reversing valve is controlled to adjust and the flow direction of the reversing valve is ensured to be: the first pipeline supplies gas to the user end; the control terminal controls the fifth valve to open, then the exhaust gas discharged from the primary separation device and the exhaust gas discharged from the exhaust outlet are supplied to the solid oxide fuel cell for experiment, as well as to the user end and the vertical riser stratified experimental equipment.

[0100] The control terminal of the present invention can be a smart terminal device such as a mobile phone or a computer; Figure 4 As shown, the control terminal includes: a central processing unit 10, a storage device 20 connected to the central processing unit 10, a communication interface (Communications Interface) 30 and a communication bus 40, wherein the central processing unit 10, the storage device 20, and the communication interface 30 communicate with each other through the communication bus 40; the communication interface 30 is used for information transmission between communication devices; the storage device 20 stores a computer program, and when the computer program is executed by the central processing unit 10, it implements any of the control methods described above; the central processing unit 10 is used to call the computer program in the storage device 20 to execute any of the control methods described above.

[0101] The present invention also provides a storage medium, wherein the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in any one of the control methods described above.

[0102] In summary, the present invention provides a natural gas hydrogen blending experimental system and a control method thereof. The present application sets the primary blending device and the secondary blending device, and supplies the hydrogen-blended natural gas obtained after hydrogen blending by the primary blending device to the first experimental device, and supplies the hydrogen-blended natural gas obtained after hydrogen blending by the secondary blending device to the second experimental device, so that the first experimental device and the second experimental device can perform experiments at the same time, and the hydrogen blending ratios of the hydrogen-blended natural gases obtained by the two are different, thereby achieving the technical purpose of simultaneously performing experiments with different hydrogen blending ratios on the two experimental devices and improving the efficiency of the natural gas hydrogen blending experiment.

[0103] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A natural gas hydrogen blending experimental system, comprising a natural gas source and a hydrogen source, characterized in that: It also includes: First experimental equipment; Second experimental equipment; a primary blending device, the inlet of which is connected to the natural gas source and the hydrogen source respectively, and the outlet of which is connected to the inlet of the first experimental device; A secondary blending device, whose inlet is connected to the hydrogen source and the outlet of the first experimental device respectively, and whose outlet is connected to the inlet of the second experimental device; A control terminal, connected to the primary blending device, the secondary blending device, the first experimental device and the second experimental device respectively; the control terminal is used to receive operation instructions and output corresponding control signals; The control terminal is used to control the primary blending device, the secondary blending device, the first experimental device and the second laboratory device to start up when receiving an operation instruction to simultaneously carry out two hydrogen blending ratio experiments; obtain the natural gas flow rate output by the natural gas source and the hydrogen flow rate output by the hydrogen source, and calculate and judge whether the primary hydrogen blending ratio output by the primary blending device is equal to the preset primary hydrogen blending ratio, and whether the secondary hydrogen blending ratio output by the secondary blending device is equal to the preset secondary hydrogen blending ratio according to the natural gas flow rate and the hydrogen flow rate; when the primary hydrogen blending ratio is not equal to the preset primary hydrogen blending ratio and / or the secondary hydrogen blending ratio is not equal to the preset secondary hydrogen blending ratio, adjust the hydrogen flow rate until the primary hydrogen blending ratio is equal to the preset primary hydrogen blending ratio, and the secondary hydrogen blending ratio is equal to the preset secondary hydrogen blending ratio.

2. The natural gas hydrogen blending experimental system according to claim 1, characterized in that: It also includes: A user end is connected to an outlet of the secondary blending device and an outlet of the second experimental device respectively; A first valve is disposed between the outlet of the secondary blending device and the inlet of the user end and is connected to the control terminal; a second valve connected to the control terminal; The outlet of the primary mixing device is connected to the inlet of the secondary mixing device, and the second valve is arranged between the outlet of the primary mixing device and the inlet of the secondary mixing device.

3. The natural gas hydrogen blending experimental system according to claim 2, characterized in that: It also includes: A separation device, used for separating hydrogen and natural gas, and having a hydrogen output port and a tail gas output port; the inlet of the separation device is connected to the outlet of the primary blending device; A proton membrane fuel cell connected to the hydrogen energy output port; A solid oxide fuel cell is connected to the tail gas output port through a first pipeline.

4. The natural gas hydrogen blending experimental system according to claim 3 is characterized in that: It also includes: A second pipeline, one end of which is connected between the outlet of the second experimental device and the user end, and the other end of which is connected to the first pipeline; The reversing valve is arranged on the second pipeline.

5. The natural gas hydrogen blending experimental system according to claim 3 is characterized in that: The separation device comprises: a primary separation device, the inlet of which is connected to the outlet of the primary blending device; A pressurizing device, the inlet of which is connected to the outlet of the primary separation device; The membrane separation device has an inlet connected to the outlet of the booster device and has the hydrogen energy output port and the tail gas output port.

6. The natural gas hydrogen blending experimental system according to claim 3, characterized in that: It also includes: The vertical riser layered experimental equipment is respectively connected to the exhaust gas outlet and the outlet of the second experimental equipment.

7. A control method for the natural gas hydrogen blending experimental system according to any one of claims 1 to 6, characterized in that: The control method comprises the following steps: When the control terminal receives an operation instruction to carry out two hydrogen blending ratio experiments at the same time, the primary blending device, the secondary blending device, the first experimental device and the second laboratory device are all controlled to start; Obtaining a natural gas flow rate output by a natural gas source and a hydrogen flow rate output by a hydrogen source, and calculating and judging whether a primary hydrogen blending ratio output by the primary blending device is equal to a preset primary hydrogen blending ratio, and whether a secondary hydrogen blending ratio output by the secondary blending device is equal to a preset secondary hydrogen blending ratio according to the natural gas flow rate and the hydrogen flow rate; When the primary hydrogen doping ratio is not equal to the preset primary hydrogen doping ratio and / or the secondary hydrogen doping ratio is not equal to the preset secondary hydrogen doping ratio, the hydrogen flow rate is adjusted until the primary hydrogen doping ratio is equal to the preset primary hydrogen doping ratio and the secondary hydrogen doping ratio is equal to the preset secondary hydrogen doping ratio.

8. The control method according to claim 7, characterized in that: It also includes the steps of: When the control terminal receives the sampling and analysis operation instruction of the experimental equipment, the first experimental equipment and the second experimental equipment are controlled to be closed, and the first valve and the second valve are controlled to be opened.

9. The control method according to claim 8, characterized in that: The natural gas is mixed with hydrogen The experimental system also includes a third valve, a fourth valve and a fifth valve connected to the control terminal; the third valve is arranged between the inlet of the separation device and the outlet of the primary blending device; the fourth valve is arranged between the outlet of the primary blending device and the inlet of the first experimental device; the fifth valve is arranged between the outlet of the separation device and the vertical standpipe layered experimental device; The control method further comprises the steps of: When the control terminal receives an operation instruction to simultaneously carry out two hydrogen doping ratio experiments, a proton membrane fuel cell experiment, and a solid oxide fuel cell experiment, the third valve, the fourth valve, the first experimental device, and the second experimental device are controlled to be opened, and the first valve, the second valve, the reversing valve, and the fifth valve are controlled to be closed; Obtaining the tail gas treatment volume entering the separation device, and comparing the tail gas treatment volume with a preset tail gas supply volume; When the exhaust gas treatment volume is less than the preset exhaust gas supply volume, the reversing valve is opened, and the opening of the fourth valve is controlled to increase, so that the hydrogen-blended natural gas output by the second experimental equipment is supplied to the solid oxide fuel cell after passing through the reversing valve.

10. The control method according to claim 9, characterized in that: It also includes the steps of: When the exhaust gas treatment volume is greater than the preset exhaust gas supply volume, the reversing valve is controlled to adjust direction, and the fifth valve is controlled to open, so that the exhaust gas output from the exhaust gas output port is supplied to the user end and the vertical riser stratified experimental equipment.

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