CN115507307A - Hydrogen leakage monitoring and response system of hydrogen mixing system - Google Patents
Hydrogen leakage monitoring and response system of hydrogen mixing system Download PDFInfo
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 239000001257 hydrogen Substances 0.000 title claims abstract description 93
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 93
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 230000004044 response Effects 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000000007 visual effect Effects 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 17
- 239000003345 natural gas Substances 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 41
- 239000010959 steel Substances 0.000 claims description 41
- 230000006870 function Effects 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 17
- 238000004720 dielectrophoresis Methods 0.000 claims description 13
- 230000010355 oscillation Effects 0.000 claims description 13
- 239000006091 Macor Substances 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000004880 explosion Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000001962 electrophoresis Methods 0.000 claims 1
- 239000002356 single layer Substances 0.000 abstract description 3
- 238000013480 data collection Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000012806 monitoring device Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital using a threshold to release an alarm or displaying means
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Abstract
The invention relates to a hydrogen leakage monitoring and response system of a hydrogen mixing system, belonging to the technical field of gas leakage monitoring; aiming at the problem that hydrogen in a hydrogen mixing device is easy to leak and diffuse, a microfluidic DEP system is designed to obtain a reduced graphene oxide single-layer sheet, a highly-sensitive reduced graphene oxide sensor and a micro gas pump are used for gas detection, an XR-2206 function generator system is designed to limit the low excitation voltage of the sensor, a waveform shaper outputs stable sine waves for the resistance change of the sensor, an 8051 microprocessor carries out signal processing and outputs hydrogen concentration to an information collection and processing terminal and an audible and visual alarm, the information collection and processing terminal carries out hydrogen concentration data collection, the audible and visual alarm receives the transmitted hydrogen concentration, whether the hydrogen concentration is larger than a preset threshold value of the audible and visual alarm by 25% or not is judged, if the hydrogen concentration is larger than the preset threshold value, audible and visual alarm is carried out, a PLC control system controls a natural gas pipeline and a hydrogen pipeline to stop gas transportation, and safe operation is realized.
Description
Technical Field
The invention relates to a hydrogen leakage monitoring and response system of a hydrogen mixing system, and belongs to the technical field of gas leakage monitoring.
Background
Global climate change prompts countries in the world to accelerate decarburization, and hydrogen is a zero-emission secondary energy source and is one of important energy sources for realizing the aim of 'double carbon'. The addition of hydrogen to NG for combustion is considered to be one way to reduce carbon emissions, and in recent years countries have encouraged the use of in-service natural gas pipelines or pipelines to transport hydrogen-loaded natural gas.
Hydrogen has the characteristics of no color, no smell, low density, easy diffusion and the like, is classified as a highly combustible element when the concentration in the air exceeds 4 percent, and is easy to combust and explode. The accident effect caused by hydrogen leakage is more serious along with the increase of the hydrogen loading concentration in the hydrogen mixing system. In the hydrogen mixing device, hydrogen gas can reduce the fracture toughness of steel, increase the crack propagation speed and reduce the fatigue life, so the leakage of hydrogen gas and the risk of combustion explosion become large.
Aiming at the problem of hydrogen leakage possibly generated by a hydrogen mixing system, a hydrogen leakage monitoring and responding system of the hydrogen mixing system needs to be designed, so that the safe mixing of hydrogen and natural gas is realized, and the hydrogen leakage monitoring and responding system has important significance for improving the economic benefit.
Disclosure of Invention
The invention aims to provide a hydrogen leakage monitoring and responding system of a hydrogen mixing system, which is designed with a PLC control system, an adjusting control device, a microfluidic dielectrophoresis system, a reduced graphene oxide sensor system, an XR-2206 function generator system, an optical coupler system, a microprocessor, an encoding keyboard, an information collecting and processing terminal and an audible and visual alarm to ensure the safe mixing of hydrogen and natural gas, and can realize the hydrogen leakage monitoring of the hydrogen mixing system, control the gas delivery of a natural gas pipeline and a hydrogen pipeline and realize the safe operation.
The invention mainly solves the following problems:
(1) And designing a PLC control system, and controlling the natural gas pipeline and the hydrogen pipeline to stop gas transmission when finding hydrogen leakage.
(2) The microfluidic dielectrophoresis system is designed to obtain the reduced graphene oxide single-layer sheet, so that the formation of aggregates of the graphene oxide sheet is avoided.
(3) The reduced graphene oxide sensor is adopted, so that the sensing characteristic of the sensor is enhanced, oxygen-containing groups and defects contained in graphene oxide are removed, more unsaturated carbon atom graphite domains and more gas adsorption active sites are generated, and the current is easier to transmit.
(4) Design XR-2206 functionThe generator system converts the resistance change of the sensor into high-quality square wave output, and the waveform shaper outputs stable sine waves. Suitably arranged with resistance R 4 Resistance R 5 A potential divider limits the low excitation voltage of the sensor.
In order to achieve the above object, the present invention has the following technical means.
The utility model provides a mix hydrogen system hydrogen leakage monitoring and response system which characterized in that: a microfluidic dielectrophoresis system 14, a reduced graphene oxide-based sensor system 20, an XR-2206 function generator system 23, an 8051 microprocessor 24, and an optical coupler system 25.
Further, the microfluidic dielectrophoresis system comprises a liquid tank A140, a liquid tank B141, a graphene oxide mixed liquid 142, a valve 143, a conveying pipeline 144, a pump 145, a table cabinet 146, a graphene oxide sheet 147, an electrode A148, an electrode B149, an electrode fixing seat 150, an electric wire A151, an electric wire B152, a power analyzer 153, naBH 4 A solution 154;
the graphene oxide mixed liquor 142 is filled in the liquid tank A140, the valve 143 is positioned below the liquid tank A140, the pump 145 is positioned between the liquid tank A140 and the electrode fixing seat 150, the electrode fixing seat 150 is positioned above the table cabinet 146, and the power analyzer 153 is connected with the electrode A148 and the electrode B149 of the electrode fixing seat 150 through an electric wire A151 and an electric wire B152;
further, the concentration of the graphene oxide mixed solution 142 is 5g/mL, and the NaBH is 4 The solution 154 was at a concentration of 10mM/L.
Further, the reduced graphene oxide-based sensor system 20 includes a sensor device 201, a micro gas pump 202, an inlet hose 203, an outlet hose 204, a1 st thin steel wire rope 205, a2 nd thin steel wire rope 206, a3 rd thin steel wire rope 207, a 4 th thin steel wire rope 208, a 5 th thin steel wire rope 209, a 6 th thin steel wire rope 210, a 7 th thin steel wire rope 211, an 8 th thin steel wire rope 212, and 8 small exhaust ports 213;
the sensor device 201 is fixed by a1 st thin steel wire rope 205, a2 nd thin steel wire rope 206, a3 rd thin steel wire rope 207 and a 4 th thin steel wire rope 208, the micro-air pump 202 is fixed by a 5 th thin steel wire rope 209, a 6 th thin steel wire rope 210, a 7 th thin steel wire rope 211 and an 8 th thin steel wire rope 212, the outlet hose 204 is connected with the micro-air pump 202 and the sensor device 201, and the 8 small-sized exhaust ports 213 are positioned at the upper part of the sensor device 201.
Further, XR-2206 function generator system 23, characterized by: including XR-2206 function generator 230, VCC 1 231、VCC 2 232、VCC 3 233、AGND 1 234、AGND 2 235、GND 1 236、GND 2 237、GND 3 238、GND 4 239. Capacitor A240, fixed capacitor 241, capacitor B242 and sensor access resistor R 1 243. Resistance R 2 244. Resistance R 3 245. Resistance R 4 246. Resistance R 5 247. A waveform shaper 248;
the VCC is 1 231、GND 4 239. A capacitor A240, a fixed capacitor 241, a capacitor B242 and a sensor access resistor R 1 243. Resistance R 2 244. Resistance R 4 246. Resistance R 5 247. The waveform shaper 248 is connected to an XR-2206 function generator 230, the AGND 1 234 is connected to a capacitor A240, GND 3 238 and a resistor R 5 247 to ground, GND 1 236 at the sensor access resistance R 1 243. Resistance R 2 244, the GND 2 237 is connected with a capacitor B242, and the resistor R 3 245 and VCC 3 233. XR-2206 function generator 230, waveform shaper 248, VCC 2 232、AGND 2 235 is connected with a waveform shaper 248;
further, the VCC is 1 231 supply voltage of 12V, VCC 2 232、VCC 3 233 power supply voltage is 5V, the capacitance of the capacitor A240 and the capacitance of the capacitor B242 are 1uF, the capacitance of the fixed capacitor 241 is 100nF, and the resistor R 2 244. Resistance R 3 245. Resistance R 4 246. Resistance R 5 247 resistances were 8.2K, 10K, 100K, 3.3K.
Further, the optical coupler system 25 includes an optical coupler 250, a jumper 251, a test input 252;
the jumper 251, test inputAn input terminal 252 for simulating a sensor access resistor R 1 The 243 input frequency signal verifies 8051 the accuracy of the information processed by microprocessor 24.
Further, the sensor device 201 comprises a reduced graphene oxide-based sensor 901, a stainless steel mesh 902, a Macor ceramic casing 903, a power connection line 904 and a signal output line 905;
the reduced graphene oxide-based sensor 901 is placed in a Macor ceramic casing 903, the stainless steel net 902 is arranged at the inlet of the Macor ceramic casing 903, and the signal output line 905 is connected with the XR-2206 function generator system 23.
A hydrogen leakage monitoring and response system of a hydrogen mixing system comprises the following steps:
s1: sensor access resistance R 1 243 and fixed capacitor 241 act as an RC oscillator, the oscillation frequency depending on the sensor access resistance R 1 243. Resistance R 2 244 and fixed capacitance 241, the frequency of oscillation is given by the equation f =2C (R) 1 +R 2 ) Calculation of the resistance R 2 244 and the value of the fixed capacitance 241 have been determined that the frequency of the fixed oscillation will depend only on the sensor access resistance R 1 243, to limit the low excitation voltage of the reduced graphene oxide based sensor system 20, a suitable resistor R is arranged 4 246. Resistance R 5 247 potential divider, sensor access resistor R 1 243 to cause the oscillation frequency to change, the XR-2206 function generator 230 outputs a square wave signal to the waveform shaper 248, and then the waveform shaper 248 outputs a sine wave;
s2: the sine wave output by the waveform shaper 248 passes through the optical coupler system 25, is converted and amplifies the input signal;
s3: the code keyboard 27 is connected with the 8051 microprocessor 24 through the RS232 connecting line 26, the 8051 microprocessor 24 is programmed by using C language, and an input signal is converted into hydrogen concentration;
s4: the 8051 microprocessor 24 outputs the hydrogen concentration to the information collecting and processing terminal 29 and the audible and visual alarm 28, the information collecting and processing terminal 29 collects the hydrogen concentration data, the audible and visual alarm 28 receives the transmitted hydrogen concentration, judges whether the hydrogen concentration is larger than a preset threshold value 25 LEL hydrogen explosion lower limit of the audible and visual alarm 28, and performs audible and visual alarm if the hydrogen concentration is larger than the preset threshold value;
s5: the PLC control system 13 receives the audible and visual alarm signal from the audible and visual alarm 28, and stops the gas transportation in the natural gas pipeline 30 and the hydrogen pipeline 31 by using the adjustment control device a15 and the adjustment control device B16.
The invention has the beneficial effects that:
(1) And designing a PLC control system, and controlling the natural gas pipeline and the hydrogen pipeline to stop gas transmission when finding hydrogen leakage.
(2) The microfluidic dielectrophoresis system is designed to obtain the graphene oxide single-layer sheet based on reduction, so that the formation of aggregates of the graphene oxide sheet is avoided.
(3) The reduced graphene oxide sensor is adopted, so that the sensing characteristic of the sensor is enhanced, oxygen-containing groups and defects contained in graphene oxide are removed, more unsaturated carbon atom graphite domains and more gas adsorption active sites are generated, and the current is easier to transmit.
(4) Designing an XR-2206 function generator system, converting the resistance change of the sensor into high-quality square wave output, outputting stable sine wave by a waveform shaper, and arranging a proper resistor R 4 Resistance R 5 A potential divider limits the low excitation voltage of the sensor.
Drawings
FIG. 1 is a diagram of a hydrogen leakage monitoring and response system of a hydrogen mixing system according to an embodiment of the present invention.
Fig. 2 is a left side view of a hydrogen leakage monitoring device of a hydrogen mixing system in an embodiment of the invention.
Fig. 3 is a right side view of the hydrogen leakage monitoring device of the hydrogen mixing system in the embodiment of the invention.
FIG. 4 is a schematic representation of a reduction-based microfluidic dielectrophoresis system in an embodiment of the invention.
FIG. 5 is a diagram of a reduced graphene oxide-based sensor system in an embodiment of the present invention.
FIG. 6 is a schematic diagram of an XR-2206 function generator system in accordance with an embodiment of the invention.
Fig. 7 is a diagram of a sensor device in an embodiment of the invention.
FIG. 8 is a schematic diagram of leak monitoring and response in an embodiment of the present invention.
Detailed Description
The following description of specific embodiments of the present invention is provided in order to better understand the present invention with reference to the accompanying drawings.
Examples
In this embodiment, fig. 1 is a diagram of a hydrogen leakage monitoring and response system of a hydrogen mixing system, fig. 2 is a left side view of the hydrogen leakage monitoring device of the hydrogen mixing system, fig. 3 is a right side view of the hydrogen leakage monitoring device of the hydrogen mixing system, the hydrogen leakage monitoring and response system of the hydrogen mixing system comprises A1 st connecting plate 1, a2 nd connecting plate 2, A3 rd connecting plate 3, a 4 th connecting plate 4, a 5 th connecting plate 5, a 6 th connecting plate 6, a 7 th connecting plate 7, an 8 th connecting plate 8, a 9 th connecting plate 9, a 10 th connecting plate 10, a 11 th connecting plate 11, a 12 th connecting plate 12, a PLC control system 13, a microfluidic dielectrophoresis system 14, a regulation control device a15, a regulation control device B16, a rubber gasket a17, a rubber gasket B18, a rubber gasket C19, a reduced graphene oxide sensor system 20, a 13 th connecting plate 21, a14 th connecting plate 22, an XR-2206 function generator system 23, an 8051 microprocessor 24, an optical coupler system 25, an RS connecting line 232, a keyboard 27, an audible and visual alarm 28, a natural gas pipeline information collecting and processing terminal 29, a natural gas pipeline 30, a hydrogen pipeline 31, a hydrogen pipeline shell, a hydrogen mixing gasket 34, a shell, a mixed gasket 34B 35, and a mixed gasket 34B 36;
the shell A33 is connected with the 2 nd connecting plate 2, the 4 th connecting plate 4, the 6 th connecting plate 6, the 8 th connecting plate 8, the 9 th connecting plate 9 and the 10 th connecting plate 10 in a clamping way by a sealing gasket A35, the shell B34 is connected with the sealing gaskets B36 under the 1 st connecting plate 1, the 3 rd connecting plate 3, the 5 th connecting plate 5, the 7 th connecting plate 7, the 11 th connecting plate 11 and the 12 th connecting plate 12 in a clamping way, the shell A33 and the shell B34 clamp the rubber gasket A17, the rubber gasket B18 and the rubber gasket C19 to be connected with the natural gas pipeline 30, the hydrogen pipeline 31 and the hydrogen mixing pipeline 32, the reduced graphene oxide based sensor system 20 is located just above and below the center of the inner face of the housing B34, the microfluidic dielectrophoresis system 14 provides reduced graphene oxide-based sensor systems 20 with graphene oxide flakes, the reduced graphene oxide-based sensor system 20 is connected with an XR-2206 function generator system 23, transmits the collected information to the XR-2206 function generator system 23, and is signaled by an XR-2206 function generator system 23, said optical coupler system 25 is connected to the XR-2206 function generator system 23, amplifies the signal signaled by the XR-2206 function generator system 23, the optical coupler system 25 is connected to the 8051 microprocessor 24, the optical coupler system 25 sends a signal to the 8051 microprocessor 24 to be processed and converted into a hydrogen concentration, the 8051 microprocessor 24 is connected with an information collecting and processing terminal 29 and an audible and visual alarm 28 through an RS232 connecting line 26, the PLC control system 13 is connected with an adjusting control device A15, an adjusting control device B16 and an audible and visual alarm 28, the code keypad 27 is connected to the 8051 microprocessor 24 via an RS232 connection 26 and programs the 8051 microprocessor 24.
Fig. 4 is a schematic diagram of a microfluidic dielectrophoresis system, which includes a liquid tank a140, a liquid tank B141, a graphene oxide mixed liquid 142, a valve 143, a conveying pipeline 144, a pump 145, a table cabinet 146, a graphene oxide sheet 147, an electrode a148, an electrode B149, an electrode holder 150, an electric wire a151, an electric wire B152, a power analyzer 153, naBH 4 A solution 154;
the liquid tank A140 is filled with graphene oxide mixed liquid 142, a valve 143 is opened, the graphene oxide mixed liquid 142 is conveyed to an electrode fixing seat 150 along a conveying pipeline 144 under the action of a pump 145, a non-uniform electric field with constant flow is generated under the action of an electrode A148 and an electrode B149, the electric field generates forward dielectrophoresis force, graphene oxide sheets 147 can be captured in the region between the electrode A148 and the electrode B149, liquid recovery is carried out by using the liquid tank B141, voltage and processing time between different peaks are adjusted, a voltage V and a current I are recorded by a power analyzer 153, an I-V curve is drawn, a signal-to-noise ratio is observed, parameter conditions under the high signal-to-noise ratio are selected, and in NaBH, the parameter conditions under the high signal-to-noise ratio are observed 4 Reducing the graphene oxide flakes 147 under the action of the solution 154;
the concentration of the graphene oxide mixed solution 142 is 5g/mL, and the NaBH is 4 The solution 154 had a concentration of 10mM/L.
FIG. 5 is a diagram of a reduced graphene oxide based sensor system, wherein the reduced graphene oxide based sensor system 101 comprises a sensor device 201, a micro gas pump 202, an inlet hose 203, an outlet hose 204, a1 st wire rope 205, a2 nd wire rope 206, a3 rd wire rope 207, a 4 th wire rope 208, a 5 th wire rope 209, a 6 th wire rope 210, a 7 th wire rope 211, an 8 th wire rope 212, and 8 small gas vents 213;
the micro gas pump 202 is started once every ten minutes to collect gas, the collected gas is conveyed to the sensor device 201 through the outlet hose 204, the gas entering the sensor device 201 is discharged through the 8 small gas outlet 213, the sensor device 201 is fixed by the 1 st thin steel wire rope 205, the 2 nd thin steel wire rope 206, the 3 rd thin steel wire rope 207 and the 4 th thin steel wire rope 208, the micro gas pump 202 is fixed by the 5 th thin steel wire rope 209, the 6 th thin steel wire rope 210, the 7 th thin steel wire rope 211 and the 8 th thin steel wire rope 212, the outlet hose 204 is connected with the micro gas pump 202 and the sensor device 201, and the 8 small gas outlet 213 is positioned at the upper part of the sensor device 201.
FIG. 6 is a schematic diagram of an XR-2206 function generator system, the XR-2206 function generator system 23 comprising an XR-2206 function generator 230, VCC 1 231、VCC 2 232、VCC 3 233、AGND 1 234、AGND 2 235、GND 1 236、GND 2 237、GND 3 238、GND 4 239. A capacitor A240, a fixed capacitor 241, a capacitor B242 and a sensor access resistor R 1 243. Resistance R 2 244. Resistance R 3 245. Resistance R 4 246. Resistance R 5 247. A waveform shaper 248, an optical coupler (250), a jumper (251), a test input (252);
the sensor is connected with a resistor R 1 243 to cause the oscillation frequency to change, the XR-2206 function generator 230 outputs a square wave signal to the waveform shaper 248, and then the waveform shaper 248 outputs a sine wave; the jumper 251, the test input end 252 and the access resistor R of the analog sensor 1 243 input frequency signal verifies 8051 microprocessor 24 processing information accuracy;
the VCC 1 231 supply voltage is 12V, VCC 2 232、VCC 3 233 supply voltage of 5V, the capacitance of the capacitor A240 and the capacitance of the capacitor B242 are 1uF, the capacitance of the fixed capacitor 241 is 100nF, and the resistance R 2 244. Resistance R 3 245. Resistance R 4 246. Resistance R 5 247 resistance was 8.2K, 10K, 100K, 3.3K.
Fig. 7 is a diagram of a sensor device including a reduced graphene oxide-based sensor 901, a stainless steel mesh 902, a Macor ceramic case 903, a power connection line 904, and a signal output line 905;
the reduced graphene oxide-based sensor 901 is placed in a Macor ceramic casing 903, the stainless steel net 902 is arranged at the inlet of the Macor ceramic casing 903, and the signal output line 905 is connected with the XR-2206 function generator system 23.
Fig. 8 is a schematic diagram of leakage monitoring and response, which includes a PLC control system 13, a microfluidic dielectrophoresis system 14, a reduced graphene oxide-based sensor 901, an XR-2206 function generator system 23, an 8051 microprocessor 24, an optical coupler system 25, an RS232 connection line 26, an encoding keyboard 27, an audible and visual alarm 28, and an information collecting and processing terminal 29;
the microfluidic dielectrophoresis system 14 is used for preparing a reduced graphene oxide sensor 901, the reduced graphene oxide sensor 901 is used for transmitting acquired information to an XR-2206 function generator system 23 and then outputting the acquired information to an optical coupler system 25 for signal amplification, an encoding keyboard 27 is used for programming an 8051 microprocessor 24 by using a C language, the 8051 microprocessor 24 is used for signal processing, signals are output to an audible and visual alarm 28 and an information collecting and processing terminal 29, and when the audible and visual alarm 28 gives an alarm, the PLC control system 13 automatically stops gas transmission.
A hydrogen leakage monitoring and response system of a hydrogen mixing system comprises the following steps:
s1: sensor access resistance R 1 243 and fixed capacitor 241 act as an RC oscillator, the oscillation frequency depending on the sensor access resistance R 1 243. Resistance R 2 244 and fixed capacitance 241, the frequency of oscillation is given by the equation f =2C (R) 1 +R 2 ) Calculation of resistance R 2 244 and the fixed capacitance 241 have determined that the fixed oscillation frequency will only takeDependent on the sensor access resistance R 1 243, to limit the low excitation voltage of the reduced graphene oxide based sensor system 20, a suitable sensor having a resistance R is arranged 4 246. Resistance R 5 247 potential divider, sensor access resistor R 1 243 to cause the oscillation frequency to change, the XR-2206 function generator 230 outputs a square wave signal to the waveform shaper 248, and then the waveform shaper 248 outputs a sine wave;
s2: the sine wave output by the waveform shaper 248 passes through the optical coupler system 25, is converted and amplifies the input signal;
s3: the code keyboard 27 is connected with the 8051 microprocessor 24 through the RS232 connecting line 26, the 8051 microprocessor 24 is programmed by C language, and the input signal is converted into hydrogen concentration;
s4:8051 the microprocessor 24 outputs the hydrogen concentration to the information collecting and processing terminal 29 and the audible and visual alarm 28, the information collecting and processing terminal 29 collects the hydrogen concentration data, the audible and visual alarm 28 receives the transmitted hydrogen concentration, determines whether the hydrogen concentration is greater than a preset threshold 25 LEL lower limit of hydrogen explosion of the audible and visual alarm 28, and performs audible and visual alarm if the hydrogen concentration is greater than the preset threshold;
s5: the PLC control system 13 receives the audible and visual alarm signal from the audible and visual alarm 28, and stops the gas transportation in the natural gas pipeline 30 and the hydrogen pipeline 31 by using the adjustment control device a15 and the adjustment control device B16.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a mix hydrogen system hydrogen leakage monitoring and response system which characterized in that: the device comprises a microfluidic dielectrophoresis system (14), a reduced graphene oxide-based sensor system (20), an XR-2206 function generator system (23), an 8051 microprocessor (24) and an optical coupler system (25).
2. Microfluidic dielectric according to claim 1An electrophoresis system (14), characterized by: comprises a liquid tank A (140), a liquid tank B (141), a graphene oxide mixed liquid (142), a valve (143), a conveying pipeline (144), a pump (145), a table cabinet (146), a graphene oxide sheet (147), an electrode A (148), an electrode B (149), an electrode fixing seat (150), an electric wire A (151), an electric wire B (152), a power analyzer (153), naBH 4 A solution (154);
the concentration of the graphene oxide mixed solution (142) is 5g/mL, and the NaBH is added 4 The concentration of the solution (154) was 10mM/L.
3. A reduced graphene oxide based sensor system (20) according to claim 1, wherein: comprises a sensor device (201), a micro gas pump (202), an inlet hose (203), an outlet hose (204), a1 st thin steel wire rope (205), a2 nd thin steel wire rope (206), a3 rd thin steel wire rope (207), a 4 th thin steel wire rope (208), a 5 th thin steel wire rope (209), a 6 th thin steel wire rope (210), a 7 th thin steel wire rope (211), an 8 th thin steel wire rope (212) and an 8-small exhaust port (213);
the sensor device (201) is fixed by a1 st thin steel wire rope (205), a2 nd thin steel wire rope (206), a3 rd thin steel wire rope (207) and a 4 th thin steel wire rope (208), the micro gas pump (202) is fixed by a 5 th thin steel wire rope (209), a 6 th thin steel wire rope (210), a 7 th thin steel wire rope (211) and an 8 th thin steel wire rope (212), the outlet hose (204) is connected with the micro gas pump (202) and the sensor device (201), and the 8 small exhaust ports (213) are positioned at the upper part of the sensor device (201).
4. The XR-2206 function generator system (23) of claim 1, wherein: comprises an XR-2206 function generator (230), VCC 1 (231)、VCC 2 (232)、VCC 3 (233)、AGND 1 (234)、AGND 2 (235)、GND 1 (236)、GND 2 (237)、GND 3 (238)、GND 4 (239) A capacitor A (240), a fixed capacitor (241), a capacitor B (242), and a sensor access resistor R 1 (243) Resistance R 2 (244) Resistance R 3 (245) Resistance R 4 (246) And a resistor R 5 (247) A waveform shaper (248);
the VCC 1 (231) The supply voltage is 12V, VCC 2 (232)、VCC 3 (233) The power supply voltage is 5V, the capacitance of the capacitor A (240) and the capacitance of the capacitor B (242) is 1uF, the capacitance of the fixed capacitor (241) is 100nF, and the resistance R 2 (244) Resistance R 3 (245) Resistance R 4 (246) And a resistor R 5 (247) The resistances were 8.2K, 10K, 100K, 3.3K.
5. The optical coupler system (25) of claim 1, wherein: the test circuit comprises an optical coupler (250), a jumper (251) and a test input end (252);
the jumper (251), the test input end (252) can simulate a sensor access resistor R 1 (243) The input frequency signal verifies the accuracy of the information processed by the 8051 microprocessor (24).
6. The sensor device (201) of claim 3, wherein: the graphene oxide sensor comprises a reduced graphene oxide sensor (901), a stainless steel mesh (902), a Macor ceramic casing (903), a power supply connecting wire (904) and a signal output wire (905);
the reduced graphene oxide-based sensor (901) is placed in a Macor ceramic casing (903), the stainless steel net (902) is arranged at the inlet of the Macor ceramic casing (903), and the signal output line (905) is connected with an XR-2206 function generator system (23).
7. A hydrogen leakage monitoring and response system of a hydrogen mixing system comprises the following steps:
s1: sensor access resistance R 1 (243) As an RC oscillator with a fixed capacitor (241), the oscillation frequency depending on the sensor access resistance R 1 (243) And a resistor R 2 (244) With the value of the fixed capacitance (241), the frequency of oscillation is given by the equation f =2C (R) 1 +R 2 ) Calculation of resistance R 2 (244) With the fixed capacitance (241) value determined, the fixed oscillation frequency will depend only on the sensor access resistance R 1 (243) In order to limit the low excitation voltage of the reduced graphene oxide-based sensor system (20), a suitable arrangement is providedHaving a resistance R 4 (246) And a resistor R 5 (247) Potential divider, sensor access resistor R 1 (243) The change of the oscillation frequency is caused, the XR-2206 function generator (230) outputs a square wave signal to the waveform shaper (248), and then the waveform shaper (248) outputs a sine wave;
s2: the sine wave output by the waveform shaper (248) passes through an optical coupler system (25), is converted and amplifies an input signal;
s3: the code keyboard (27) is connected with the 8051 microprocessor (24) through an RS232 connecting line (26), the 8051 microprocessor (24) is programmed by C language, and an input signal is converted into hydrogen concentration;
s4:8051 the microprocessor (24) outputs the hydrogen concentration to the information collecting and processing terminal (29) and the audible and visual alarm (28), the information collecting and processing terminal (29) collects the hydrogen concentration data, the audible and visual alarm (28) receives the transmitted hydrogen concentration, judges whether the hydrogen concentration is larger than a preset threshold value (25% LEL) (lower limit of hydrogen explosion) of the audible and visual alarm (28), and if so, performs audible and visual alarm;
s5: the PLC control system (13) receives the sound-light alarm signal from the sound-light alarm (28), and stops gas transmission in the natural gas pipeline (30) and the hydrogen pipeline (31) by using the adjusting control device A (15) and the adjusting control device B (16).
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