CN115507307B - Hydrogen leakage monitoring and responding system of hydrogen mixing system - Google Patents
Hydrogen leakage monitoring and responding system of hydrogen mixing system Download PDFInfo
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- CN115507307B CN115507307B CN202211106540.9A CN202211106540A CN115507307B CN 115507307 B CN115507307 B CN 115507307B CN 202211106540 A CN202211106540 A CN 202211106540A CN 115507307 B CN115507307 B CN 115507307B
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000001257 hydrogen Substances 0.000 title claims abstract description 88
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 88
- 238000002156 mixing Methods 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 title claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 42
- 230000000007 visual effect Effects 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 18
- 239000003345 natural gas Substances 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 26
- 230000006870 function Effects 0.000 claims description 26
- 230000010355 oscillation Effects 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000004880 explosion Methods 0.000 claims description 5
- 239000002356 single layer Substances 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000013480 data collection Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 150000002431 hydrogen Chemical class 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 15
- 238000004720 dielectrophoresis Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000009467 reduction Effects 0.000 description 10
- 239000006091 Macor Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000012806 monitoring device Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 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
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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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
-
- 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
-
- 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 or the display, e.g. intermittent measurement or digital display
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The invention relates to a hydrogen leakage monitoring and responding system of a hydrogen mixing system, belonging to the technical field of gas leakage monitoring; aiming at the problem of easy leakage and diffusion of hydrogen in a hydrogen mixing device, a microfluidic DEP system is designed to obtain a reduced graphene oxide single-layer sheet, a high-sensitivity reduced graphene oxide sensor and a miniature gas pump are utilized to carry out gas detection, an XR-2206 function generator system is designed to limit low excitation voltage of the sensor, the resistance change of the sensor is output to be stable sine waves by a waveform shaper, a 8051 microprocessor carries out signal processing, the concentration of the hydrogen is output to an information collecting and processing terminal and an audible and visual alarm, the information collecting and processing terminal carries out hydrogen concentration data collection, the audible and visual alarm receives the concentration of the incoming hydrogen, whether the concentration of the hydrogen is larger than a preset threshold value of 25% of the audible and visual alarm is judged, if the concentration of the hydrogen is larger than the preset threshold value of the audible and visual alarm, a PLC control system controls a natural gas pipeline and a hydrogen pipeline to stop gas conveying, and safe operation is realized.
Description
Technical Field
The invention relates to a hydrogen leakage monitoring and responding system of a hydrogen mixing system, and belongs to the technical field of gas leakage monitoring.
Background
Global climate change promotes the acceleration of decarburization in countries around the world, and hydrogen is a zero-emission secondary energy source, which is one of important energy sources for achieving the aim of double carbon. The addition of hydrogen to NG for combustion is considered a way to reduce carbon emissions, so in recent years countries have encouraged the use of in-service natural gas pipelines or pipe networks to deliver hydrogen-loaded natural gas.
Hydrogen has the characteristics of no color and smell, low density, easy diffusion and the like, is classified as a highly inflammable element when the concentration in the air exceeds 4 percent, and is easy to burn and explode. The accident consequences of hydrogen leakage are also more serious with the increase of the hydrogen loading concentration in the hydrogen mixing system. In a hydrogen mixing device, hydrogen gas can reduce the fracture toughness of steel, increase the crack propagation speed and reduce the fatigue life, so that the leakage of the hydrogen gas and the risk of combustion explosion are increased.
Aiming at the problem of hydrogen leakage possibly occurring in a hydrogen mixing system, a hydrogen leakage monitoring and responding system of the hydrogen mixing system needs to be designed, so that safe mixing of hydrogen and natural gas is realized, and the method has important significance for improving 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 to ensure safe mixing of hydrogen and natural gas, and comprises a PLC control system, an adjusting control device, a micro-fluidic dielectrophoresis system, a graphene oxide sensor system based on reduction, an XR-2206 function generator system, an optical coupler system, a microprocessor, a coding keyboard, an information collecting and processing terminal and an audible and visual alarm.
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 conveying when the leakage of hydrogen is found.
(2) The microfluidic dielectrophoresis system is designed to obtain a graphene oxide monolayer sheet based on reduction, so that an aggregate of the graphene oxide sheet is avoided.
(3) The graphene oxide sensor based on reduction is adopted, 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 current is easier to transmit.
(4) An XR-2206 function generator system is designed to convert the sensor resistance change into a high-quality square wave output, and a waveform shaper outputs a stable sine wave. A suitable potential divider with resistors R 4, R 5 is arranged to limit the low excitation voltage of the sensor.
In order to achieve the above object, the present invention has the following technical scheme.
A hydrogen leakage monitoring and responding system of a hydrogen mixing system is 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, an optocoupler system 25.
Further, the microfluidic dielectrophoresis system comprises a liquid tank A140, a liquid tank B141, graphene oxide mixed liquid 142, a valve 143, a conveying pipeline 144, a pump 145, a table cabinet 146, graphene oxide sheets 147, an electrode A148, an electrode B149, an electrode fixing seat 150, an electric wire A151, an electric wire B152, a power analyzer 153 and NaBH 4 solution 154.
The graphene oxide mixed solution 142 is arranged 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 on the table cabinet 146, and the power analyzer 153 is connected with the electrodes A148 and B149 of the electrode fixing seat 150 through the wires A151 and B152.
Further, the concentration of the graphene oxide mixed solution 142 is 5g/mL, and the concentration of the NaBH 4 solution 154 is 10mM/L.
Further, the reduced graphene oxide sensor system 20 includes 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, a 3 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 an 8 th mini-exhaust port 213.
The sensor device 201 is fixed by a 1 st thin wire rope 205, a 2 nd thin wire rope 206, a 3 rd thin wire rope 207 and a4 th thin wire rope 208, the micro gas pump 202 is fixed by a 5 th thin wire rope 209, a6 th thin wire rope 210, a 7 th thin wire rope 211 and an 8 th thin 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 outlets 213 are arranged at the upper part of the sensor device 201.
Further, XR-2206 function generator system 23 is characterized by: the sensor comprises an XR-2206 function generator 230、VCC1231、VCC2232、VCC3233、AGND1234、AGND2235、GND1236、GND2237、GND3238、GND4239、, a capacitor A240, a fixed capacitor C241, a capacitor B242, a sensor access resistor R 1 243, a resistor R 2 244, a resistor R 3 245, a resistor R 4 246, a resistor R 5 247 and a waveform shaper 248;
The VCC 1231、GND4, the capacitor A240, the fixed capacitor C241, the capacitor B242, the sensor access resistor R 1 243, the resistor R 2 244, the resistor R 4 246, the resistor R 5 247 and the waveform shaper 248 are connected with the XR-2206 function generator 230, the AGND 1 234 is connected with the capacitor A240, the GND 3 is connected with the resistor R 5 247, the GND 1 236 is positioned between the sensor access resistor R 1 243 and the resistor R 2 244, the GND 2 237 is connected with the capacitor B242, the resistor R 3 245 is connected with the VCC 3 233, the XR-2206 function generator 230 and the waveform shaper 248, and the VCC 2232、AGND2 is connected with the waveform shaper 248;
Further, the supply voltage of VCC 1 V, the supply voltage of VCC 2232、VCC3 233 is 5V, the capacitances of capacitor a240 and capacitor B242 are 1uF, the capacitance of fixed capacitor C241 is 100nF, and the resistances of resistor R 2, resistor R 3 245, resistor R 4 246 and resistor R 5 247 are 8.2K, 10K, 100K and 3.3K.
Further, the optocoupler system 25 includes an optocoupler 250, a jumper 251, a test input 252;
The jumper 251 and the test input end 252 can simulate the input frequency signal of the sensor access resistor R 1 243 to verify the accuracy of the processing information of the 8051 microprocessor 24.
Further, the sensor device 201 includes a reduced graphene oxide based sensor 901, a stainless steel mesh 902, a Macor ceramic housing 903, a power connection 904, a signal output line 905;
the reduced graphene oxide based sensor 901 is placed within a Macor ceramic housing 903, the stainless steel mesh 902 is placed at the inlet of the Macor ceramic housing 903, and the signal output line 905 is connected to the XR-2206 function generator system 23.
A hydrogen leakage monitoring and responding system of a hydrogen mixing system comprises the following steps:
S1: the sensor is connected with a resistor R 1 and a fixed capacitor C241 to serve as RC oscillators, the oscillation frequency depends on the values of the resistor R 1 243, the resistor R 2 244 and the fixed capacitor C241, the oscillation frequency is calculated by an equation f=2C (R 1+R2), the values of the resistor R 2 244 and the fixed capacitor C241 are determined, the fixed oscillation frequency only depends on the resistor R 1 243, the resistor R 4 246 and the resistor R 5 are arranged to limit the low excitation voltage of the reduced graphene oxide sensor system 20, the resistor R 1 243 causes oscillation frequency change, the XR-2206 function generator 230 outputs square wave signals to the waveform shaper 248, and the waveform shaper 248 outputs sine waves;
S2: the sine wave output by the waveform shaper 248 is converted by the optocoupler system 25 to amplify the input signal;
S3: the encoding keyboard 27 is connected with the 8051 microprocessor 24 through the RS232 connection line 26, and the 8051 microprocessor 24 is programmed by using the C language to convert an input signal into hydrogen concentration;
S4: the 8051 microprocessor 24 outputs the hydrogen concentration to the information collection and processing terminal 29 and the audible and visual annunciator 28, the information collection and processing terminal 29 collects hydrogen concentration data, the audible and visual annunciator 28 receives the incoming hydrogen concentration, judges whether the hydrogen concentration is larger than the preset threshold 25% LEL hydrogen explosion lower limit of the audible and visual annunciator 28, and performs audible and visual annunciation if the hydrogen concentration is larger 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 supply in the natural gas line 30 and the hydrogen line 31 by the adjustment control device a15 and the adjustment control device B16.
The beneficial effects of the invention are as follows:
(1) And designing a PLC control system, and controlling the natural gas pipeline and the hydrogen pipeline to stop gas conveying when the leakage of hydrogen is found.
(2) The microfluidic dielectrophoresis system is designed to obtain a graphene oxide monolayer sheet based on reduction, so that an aggregate of the graphene oxide sheet is avoided.
(3) The graphene oxide sensor based on reduction is adopted, 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 current is easier to transmit.
(4) An XR-2206 function generator system is designed to convert the sensor resistance change into a high-quality square wave output, and a waveform shaper outputs a stable sine wave or triangular wave. A suitable potential divider with resistors R 4, R 5 is arranged to limit the low excitation voltage of the sensor.
Drawings
FIG. 1 is a diagram of a hydrogen leakage monitoring and response system for a hydrogen blending system in accordance with 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 a hydrogen leakage monitoring device of a hydrogen mixing system according to an embodiment of the present invention.
Fig. 4 is a schematic representation of a microfluidic dielectrophoresis based on reduction in an embodiment of the present 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 invention.
Detailed Description
The following description of specific embodiments of the invention is provided in connection with the accompanying drawings to provide a better understanding of the invention.
Examples
In this embodiment, fig. 1 is a diagram of a hydrogen leakage monitoring and responding system of a hydrogen mixing system, fig. 2 is a left side view of a 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 responding 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, an adjusting control device a15, an adjusting 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, a 14 th connecting plate 22, an XR-2206 function generator system 23, an 8051 microprocessor 24, an optocoupler system 25, a 232 RS 26, a coding keyboard 27, an acousto-optic alarm 28, an information collecting and processing terminal 29, a natural gas pipeline 30, a hydrogen pipeline 31, a hydrogen pipeline shell B32, a sealing gasket B33, a sealing gasket B, a 35B, and a sealing gasket B35;
The shell A33 is connected with the clamping gaskets A35 under 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, the shell B34 is connected with the clamping 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, the shell A33 and the shell B34 are connected with the rubber gasket A17, the rubber gasket B18 and the rubber gasket C19, the natural gas pipeline 30, the hydrogen pipeline 31 and the hydrogen mixing pipeline 32, the reduced graphene oxide sensor system 20 is positioned right under the center above the inner face of the shell B34, the micro-dielectrophoresis system 14 provides graphene oxide sheets for the reduced graphene oxide sensor system 20, the reduction-based graphene oxide sensor system 20 is connected with the XR-2206 function generator system 23, the collected information is transmitted to the XR-2206 function generator system 23, the XR-2206 function generator system 23 sends out signals, the optical coupler system 25 is connected with the XR-2206 function generator system 23, the XR-2206 function generator system 23 sends out signals to be amplified, the optical coupler system 25 is connected with the 8051 microprocessor 24, the optical coupler system 25 sends out signals to the 8051 microprocessor 24 to be processed and converted into hydrogen concentration, the 8051 microprocessor 24 is connected with the information collecting and processing terminal 29 and the acousto-optic alarm 28 through an RS232 connecting wire 26, the PLC control system 13 is connected with the adjusting control device A15, the adjusting control device B16 and the acousto-optic alarm 28, the code keypad 27 is connected to the 8051 microprocessor 24 by 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 146, a graphene oxide sheet 147, an electrode a148, an electrode B149, a graphene mixed liquid 142, an electrode fixing seat 150, an electric wire a151, an electric wire B152, a power analyzer 153, and NaBH 4 solution 154;
The liquid tank A140 is provided with a graphene oxide mixed liquid 142, a valve 143 is opened, the graphene oxide mixed liquid 142 is conveyed to the electrode fixing seat 150 along the conveying pipeline 144 under the action of the pump 145, a non-uniform electric field with constant flow is generated under the action of the electrodes A148 and B149, a forward dielectrophoresis force is generated by the electric field, the graphene oxide thin sheet 147 can be captured in the area between the electrodes A148 and B149, and liquid recovery is performed by using the liquid tank B141. The voltage between different peaks and the processing time are regulated, the voltage V and the current I are recorded by the power analyzer 153, an I-V curve is drawn, the signal to noise ratio is observed, and the parameter condition under the high signal to noise ratio is selected. The reduction of graphene oxide sheets 147 is performed under the action of NaBH 4 solution 154.
The concentration of the graphene oxide mixed solution 142 is 5g/mL, and the concentration of the NaBH 4 solution 154 is 10mM/L.
Fig. 5 is a diagram of a reduced graphene oxide based sensor system 101 including a sensor device 201, a micro gas pump 202, an inlet hose 203, an outlet hose 204, a1 st thin wire rope 205, a 2 nd thin wire rope 206, a 3 rd thin wire rope 207, a4 th thin wire rope 208, a5 th thin wire rope 209, a6 th thin wire rope 210, a 7 th thin wire rope 211, an 8 th thin wire rope 212, and an 8 th small exhaust port 213;
The micro gas pump 202 is started every ten minutes to collect gas. The collected gas is delivered to the sensor device 201 through the outlet hose 204 and the incoming gas is exhausted through the 8 mini-vents 213. The sensor device 201 is fixed by a1 st thin wire rope 205, a2 nd thin wire rope 206, a3 rd thin wire rope 207 and a4 th thin wire rope 208, the micro gas pump 202 is fixed by a 5 th thin wire rope 209, a 6 th thin wire rope 210, a 7 th thin wire rope 211 and an 8 th thin 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 outlets 213 are arranged at the upper part of the sensor device 201.
FIG. 6 is a schematic diagram of an XR-2206 function generator system, where XR-2206 function generator system 23 includes XR-2206 function generator 230、VCC1231、VCC2232、VCC3233、AGND1234、AGND2235、GND1236、GND2237、GND3238、GND4239、 capacitor A240, fixed capacitor C241, capacitor B242, sensor access resistor R 1 243, resistor R 2 244, resistor R 3 245, resistor R 4 246, resistor R 5 247, waveform shaper 248, optocoupler 250, jumper 251, test input 252;
The sensor is connected with a resistor R 1 243 to cause oscillation frequency change, the XR-2206 function generator system 23 outputs square wave signals to the waveform shaper 248, and the waveform shaper 248 outputs sine waves; the jumper 251 and the test input end 252 can simulate the input frequency signal of the sensor access resistor R 1 243 to verify the accuracy of the processing information of the 8051 microprocessor 24;
The power supply voltage of the VCC 1 is 12V, the power supply voltage of the VCC 2232、VCC3 233 is 5V, the capacitance of the capacitor A240 and the capacitance of the capacitor B242 are 1uF, the capacitance of the fixed capacitor C241 is 100nF, and the resistances of the resistor R 2 244, the resistor R 3 245, the resistor R 4 246 and the resistor R 5 247 are 8.2K, 10K, 100K and 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 housing 903, power connection lines 904, signal output lines 905;
The reduced graphene oxide based sensor 901 is placed within a Macor ceramic housing 903, the stainless steel mesh 902 is disposed at the inlet of the Macor ceramic housing 903, and the signal output line 905 is connected to the XR-2206 function generator system 23.
FIG. 8 is a schematic diagram of leak monitoring and response, including 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 optocoupler system 25, an RS232 connection 26, a coded keypad 27, an audible and visual alarm 28, and an information collection and processing terminal 29;
The microfluidic dielectrophoresis system 14 is used for preparing a graphene oxide sensor 901 based on reduction, the graphene oxide sensor 901 based on reduction transmits acquired information to the XR-2206 function generator system 23 and then outputs the acquired information to the optical coupler system 25 for signal amplification, the 8051 microprocessor 24 is programmed by the code keyboard 27 through C language, the 8051 microprocessor 24 performs signal processing, signals are output to the audible and visual alarm 28 and the 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 responding system of a hydrogen mixing system comprises the following steps:
S1: the sensor is connected with a resistor R 1 and a fixed capacitor C241 to serve as RC oscillators, the oscillation frequency depends on the values of the resistor R 1 243, the resistor R 2 244 and the fixed capacitor C241, the oscillation frequency is calculated by an equation f=2C (R 1+R2), the values of the resistor R 2 244 and the fixed capacitor C241 are determined, the fixed oscillation frequency only depends on the resistor R 1 243, the resistor R 4 246 and the resistor R 5 are arranged to limit the low excitation voltage of the reduced graphene oxide sensor system 20, the resistor R 1 243 causes oscillation frequency change, the XR-2206 function generator 230 outputs square wave signals to the waveform shaper 248, and the waveform shaper 248 outputs sine waves;
s2: the sine wave or the triangular wave output by the waveform shaper 248 passes through the optical coupler system 25, is converted, and amplifies the input signal;
S3: the encoding keyboard 27 is connected with the 8051 microprocessor 24 through the RS232 connection line 26, and the 8051 microprocessor 24 is programmed by using the C language to convert an input signal into hydrogen concentration;
S4: the 8051 microprocessor 24 outputs the hydrogen concentration to the information collection and processing terminal 29 and the audible and visual annunciator 28, the information collection and processing terminal 29 collects hydrogen concentration data, the audible and visual annunciator 28 receives the incoming hydrogen concentration, judges whether the hydrogen concentration is larger than the preset threshold 25% LEL hydrogen explosion lower limit of the audible and visual annunciator 28, and performs audible and visual annunciation if the hydrogen concentration is larger 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 supply in the natural gas line 30 and the hydrogen line 31 by the adjustment control device a15 and the adjustment control device B16.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (1)
1. A hydrogen leakage monitoring and responding system of a hydrogen mixing system comprises the following steps:
S1: the sensor is connected with a resistor R 1 (243) and a fixed capacitor C (241) to serve as an RC oscillator, the oscillation frequency depends on the values of the resistor R 1 (243), the resistor R 2 (244) and the fixed capacitor C (241), the oscillation frequency is calculated by an equation f=2C (R 1+R2), the values of the resistor R 2 (244) and the fixed capacitor C (241) are determined, the fixed oscillation frequency only depends on the resistor R 1 (243), the resistor R 4 (246) and the resistor R 5 (247) are arranged to limit the low excitation voltage of the reduced graphene oxide sensor system (20), the sensor is connected with the resistor R 1 (243) to cause oscillation frequency change, the XR-2206 function generator (230) outputs square wave signals to the wave shaper (248), and the wave shaper (248) outputs sine waves;
S2: the sine wave output by the waveform shaper (248) passes through the optical coupler system (25) and is converted to amplify the input signal;
S3: the encoding keyboard (27) is connected with the 8051 microprocessor (24) through an RS232 connecting wire (26), and the 8051 microprocessor (24) is programmed by using C language to convert an input signal into hydrogen concentration;
S4: the 8051 microprocessor (24) outputs the hydrogen concentration to the information collection and processing terminal (29) and the audible and visual alarm (28), the information collection and processing terminal (29) collects hydrogen concentration data, the audible and visual alarm (28) receives the incoming hydrogen concentration, judges whether the hydrogen concentration is greater than 25% LEL (lower limit of hydrogen explosion) of a preset threshold value of the audible and visual alarm (28), and if the hydrogen concentration is greater than the lower limit of hydrogen explosion, performs audible and visual alarm;
S5: the PLC control system (13) receives the audible and visual alarm signal from the audible and visual alarm (28), and the adjusting control device A (15) and the adjusting control device B (16) are utilized to stop the gas transportation in the natural gas pipeline (30) and the hydrogen pipeline (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211106540.9A CN115507307B (en) | 2022-09-12 | 2022-09-12 | Hydrogen leakage monitoring and responding system of hydrogen mixing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211106540.9A CN115507307B (en) | 2022-09-12 | 2022-09-12 | Hydrogen leakage monitoring and responding system of hydrogen mixing system |
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