CN105866195A - Methanol concentration sensing system - Google Patents
Methanol concentration sensing system Download PDFInfo
- Publication number
- CN105866195A CN105866195A CN201610488029.8A CN201610488029A CN105866195A CN 105866195 A CN105866195 A CN 105866195A CN 201610488029 A CN201610488029 A CN 201610488029A CN 105866195 A CN105866195 A CN 105866195A
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- CN
- China
- Prior art keywords
- methanol
- concentration
- sensor
- circuit
- methanol solution
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
- G01N27/127—Composition of the body, e.g. the composition of its sensitive layer comprising nanoparticles
Abstract
The invention provides a methanol concentration sensing system and belongs to the technical field of sensors. The system comprises a methanol liquid fuel cell work mixing chamber, a control circuit, a backup methanol solution container and a valve, wherein a methanol gas sensor and a temperature sensor are arranged in the methanol liquid fuel cell work mixing chamber, and the control circuit includes a methanol solution concentration identification circuit, a comparator circuit and an alarming circuit. The methanol concentration sensing system has the advantages that the system is high in sensitivity, simple in structure and easy to operate, the system detects the concentration change of to-be-detected gas by detecting resistance change, the resistance change can be detected through the simple circuit, gas contents can be converted into the corresponding output signal form, the methanol gas sensor does not need to directly contact with a to-be-detected solution, and the system is long in device service life, high in reliability and good in long-term stability.
Description
Technical field
The invention belongs to sensor technical field, be specifically related to a kind of methanol concentration sensor-based system.
Background technology
DMFC (DMFC), is with methanol as fuel, passes through on electrode with oxygen or air for oxidant
Catalytic reaction, chemical energy is converted into a kind of TRT of electric energy.Have that energy density is high, safe and reliable, structure
Simply, fuel source abundant and store easy to carry, environmental friendliness, with low cost, start the advantages such as quick.
During DMFC work, in anode region, methanol aqueous solution is after anode flow field board uniform distribution.Expanded by anode diffusion layer
Dissipate and enter in anode catalyst layer.Under the effect of catalyst, there is electrochemical oxidation reactions, generate carbon dioxide, and discharge
Hydrogen Proton and electronics, as shown in equation (1), standard electrode potential is 0.046V.
On cathode chamber, positive active material oxygen or air are after cathode flow field plate uniform distribution.Pass through cathode diffusion layer
Spread and enter in cathode catalysis layer.With the Hydrogen Proton generation electrochemical reduction come from anode migration under the effect of catalyst
Water generation reaction is discharged from cathode outlet with reaction end gas.Shown in its electrode reaction such as equation (2), standard electrode potential is
1.23V.The electronics that anode produces carries the free energy circuit cycles outside of chemical reaction, and does useful work.
Shown in the overall reaction equation such as equation (3) of battery, methanol and oxygen react and generate carbon dioxide and water, mark
Quasi-cell voltage is 1.18V.
Methanol is as follows in the oxidation half-reaction of anode:
CH3OH+H2O→CO2+6H++6e- E1=0.046V (1)
As follows in the reduction half-reaction of negative electrode from the oxygen in air:
3/2O2+6H++6e-→3H2O E2=1.23V (2)
Battery overall reaction is as follows:
CH3OH+3/2O2+H2O→CO2+3H2O Ecell=E2-E1=1.18V (3)
During this of DMFC work, it is provided that too high to the methanol concentration of anode, then serious methanol can be occurred to ooze
Thoroughly.Thus reduce the work efficiency of DMFC, and by the methanol of infiltration arrival cathode surface it also occur that oxidation reaction, produce
Raw mixed potential, causes methanol crossover electric current to affect the discharge performance of battery.Along with the lasting meeting of this process makes DMFC's
Temperature constantly raises, thus affects the service life of battery.The methanol concentration being supplied to anode is too low, then can be because of mass transfer problem
And produce concentration polarization thus cause power density to reduce, battery performance is produced impact and reduces the stability of battery.
Therefore, a sensor-based system that can accurately control methanol concentration is very important in the real work of DMFC.
Summary of the invention
It is an object of the invention to provide a kind of methanol concentration sensor-based system, this system sensitivity is high, good stability.
The present invention provides a kind of methanol concentration sensor-based system, this system include the battery operated mixing chamber of liquid methanol fuel,
Control circuit, standby methanol solution container and valve, arrange methanol gas in the battery operated mixing chamber of described liquid methanol fuel
Body sensor and temperature sensor, control circuit includes concentration of methanol solution identification circuit, comparator circuit and warning circuit；
Described methanol gas sensor and the methanol in the temperature sensor test battery operated mixing chamber of liquid methanol fuel
Gas concentration and ambient temperature；
Described concentration of methanol solution identification circuit is for the resistance value of methanol gas sensor that will collect and correspondence
Ambient temperature information is converted to real-time concentration of methanol solution information；
The working range concentration of the real-time concentration of methanol solution information collected with setting is carried out by described comparator circuit
Relatively；
Described warning circuit does not controls to mix at the switch setting working range internal trigger valve for concentration of methanol solution
Close the concentration of methanol solution in room.
Preferably, described concentration of methanol solution identification circuit, comparator circuit and warning circuit all pass through single-chip microcomputer
Realize.
Preferably, the working range concentration 1～3mol/L of described setting.
Preferably, the preparation method of described methanol gas sensor, including:
Step one: conductor oxidate nano material is added after deionized water becomes pasty state, be coated in the pottery with signal electrode
On porcelain tube, in earthenware, then penetrate heater strip, make slug type heater-type gas sensor；
Step 2: gas sensor step one obtained is welded to test on base, at 200 DEG C～240 DEG C aging 10～
12 hours, obtain methanol gas sensor.
Preferably, described conductor oxidate nano material is SnO2, ZnO or In2O3。
Beneficial effects of the present invention
The present invention provides a kind of methanol concentration sensor-based system, this system include the battery operated mixing chamber of liquid methanol fuel,
Control circuit, standby methanol solution container and valve, arrange methanol gas in the battery operated mixing chamber of described liquid methanol fuel
Body sensor and temperature sensor, control circuit includes concentration of methanol solution identification circuit, comparator circuit and warning circuit；With
Prior art compares, and the methanol concentration sensor-based system sensitivity of the present invention is higher, and simple in construction easily operates, and this system is to pass through
Detection resistance variations detects the change of gas concentration to be measured, and this change can realize gas by simple circuit
Content and the conversion of its corresponding output signal type, methanol gas sensor used is without directly connecing with solution to be measured
Touching, so device is long for service life, reliability is high, and long-time stability are good.
Accompanying drawing explanation
Fig. 1 is the operation principle schematic diagram of methanol concentration sensor-based system of the present invention；
Fig. 2 is the structural representation of methanol gas sensor of the present invention.
Detailed description of the invention
The present invention provides a kind of methanol concentration sensor-based system, and shown in Fig. 1, this system includes that liquid methanol fuel is battery operated
Mixing chamber, control circuit, standby methanol solution container and valve, arranged in the battery operated mixing chamber of described liquid methanol fuel
Methanol gas sensor and temperature sensor, control circuit includes concentration of methanol solution identification circuit, comparator circuit and warning
Circuit；Valve is arranged between the battery operated mixing chamber of liquid methanol fuel and standby methanol solution container；
Described methanol gas sensor and temperature sensor are for testing in the battery operated mixing chamber of liquid methanol fuel
Methanol gas concentration and ambient temperature；
Described concentration of methanol solution identification circuit is for the resistance value of methanol gas sensor that will collect and correspondence
Ambient temperature information is converted to real-time concentration of methanol solution information；
Described concentration of methanol solution identification circuit is single-chip microcomputer, is previously written gas under condition of different temperatures in single-chip microcomputer
Sensor resistance and the relation of concentration of methanol solution, during the work of described concentration of methanol solution identification circuit, single-chip microcomputer will be collected
To the resistance value of methanol gas sensor and the ambient temperature information of correspondence be converted to real-time concentration of methanol solution information；
The working range concentration of the real-time concentration of methanol solution information collected with setting is carried out by described comparator circuit
Relatively；
Described comparator circuit includes concentration input module and single-chip microcomputer, is previously written typical operating range in single-chip microcomputer
Concentration of methanol solution information, wherein concentration input module is for by defeated for the real-time concentration of methanol solution information in concentration identification circuit
Enter in single-chip microcomputer and with set working range concentration compare, the working range concentration of described setting be preferably 1～
3mol/L；
Described warning circuit is single-chip microcomputer, and described warning circuit does not touches for concentration of methanol solution in setting working range
The switch sending out valve controls the concentration of methanol solution in mixing chamber.
The work process of the methanol concentration sensor-based system described in present embodiment is as follows:
Methanol gas sensor and the methanol gas in the temperature sensor test battery operated mixing chamber of liquid methanol fuel
Concentration and ambient temperature, when the concentration of tested methanol solution changes, above it, corresponding gas concentration also can change,
The resistance value of the methanol gas sensor that operating circuit collects i.e. can occur respective change.Operating circuit collects corresponding electricity
After the ambient temperature information of resistance and correspondence, the relevant temperature condition that will be collected by real-time concentration of methanol solution identification circuit
Under resistance value information be converted to real-time concentration of methanol solution information.Then the concentration of methanol solution information collected is transferred to
By comparator circuit, comparator circuit, judges that now concentration of methanol solution is whether in setting working range.When methanol solution is dense
When degree is not in reasonable working range, warning circuit will be triggered, thus control the switch of valve to control methanol in mixing chamber
The concentration of solution.
Methanol gas sensor and temperature sensor described in present embodiment are sensor commonly used in the art, described
Methanol gas sensor is all gas sensors to methanol with sensitivity characteristic, and preparation method is not particularly limited, described
The preparation method of methanol gas sensor preferably include:
Step one: conductor oxidate nano material is added after deionized water becomes pasty state, be coated in the pottery with signal electrode 2
On porcelain tube 1, in earthenware 1, then penetrate heater strip 3, make slug type heater-type gas sensor, its structural representation such as Fig. 2
Shown in；Described conductor oxidate nano material is to have the conductor oxidate nanometer material of sensitivity characteristic to methanol gas
Material, preferably includes SnO2, ZnO or In2O3。
Step 2: be welded to ready-made for step one gas sensor test on base, at 200 DEG C～240 DEG C aging 10～
12 hours, obtain methanol gas sensor.
Claims (5)
1. a methanol concentration sensor-based system, it is characterised in that this system includes the battery operated mixing chamber of liquid methanol fuel, control
Circuit processed, standby methanol solution container and valve, arrange methanol gas in the battery operated mixing chamber of described liquid methanol fuel
Sensor and temperature sensor, control circuit includes concentration of methanol solution identification circuit, comparator circuit and warning circuit；
Described methanol gas sensor and the methanol gas in the temperature sensor test battery operated mixing chamber of liquid methanol fuel
Concentration and ambient temperature；
Described concentration of methanol solution identification circuit is for the resistance value of methanol gas sensor that will collect and the environment of correspondence
Temperature information is converted to real-time concentration of methanol solution information；
The working range concentration of the real-time concentration of methanol solution information collected with setting is compared by described comparator circuit；
Described warning circuit does not controls mixing chamber at the switch setting working range internal trigger valve for concentration of methanol solution
The concentration of middle methanol solution.
A kind of methanol concentration sensor-based system the most according to claim 1, it is characterised in that described concentration of methanol solution is known
Other circuit, comparator circuit and warning circuit all pass through chip microcontroller.
A kind of methanol concentration sensor-based system the most according to claim 1, it is characterised in that the working range of described setting
Concentration is 1～3mol/L.
A kind of methanol concentration sensor-based system the most according to claim 1, it is characterised in that described methanol gas sensor
Preparation method, including:
Step one: conductor oxidate nano material is added after deionized water becomes pasty state, be coated in the pottery with signal electrode (2)
On pipe (1), in earthenware, then penetrate heater strip (3), make slug type heater-type gas sensor；
Step 2: gas sensor step one obtained is welded to test on base is aging 10～12 little at 200 DEG C～240 DEG C
Time, obtain methanol gas sensor.
A kind of methanol concentration sensor-based system the most according to claim 4, it is characterised in that described conductor oxidate is received
Rice material is SnO2, ZnO or In2O3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488029.8A CN105866195A (en) | 2016-06-29 | 2016-06-29 | Methanol concentration sensing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488029.8A CN105866195A (en) | 2016-06-29 | 2016-06-29 | Methanol concentration sensing system |
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| Publication Number | Publication Date |
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| CN105866195A true CN105866195A (en) | 2016-08-17 |
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| CN201610488029.8A Pending CN105866195A (en) | 2016-06-29 | 2016-06-29 | Methanol concentration sensing system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004111212A (en) * | 2002-09-18 | 2004-04-08 | Yamaha Motor Co Ltd | Fuel cell system |
| CN1830112A (en) * | 2003-06-24 | 2006-09-06 | 日本电气株式会社 | Method for determining alcohol concentration, apparatus for determining alcohol concentration, and fuel cell system including such apparatus |
| CN101034751A (en) * | 2007-03-21 | 2007-09-12 | 清华大学 | Control method for the density of the direct carbinol fuel battery carbinol solution and the device |
| CN201117725Y (en) * | 2007-08-03 | 2008-09-17 | 清华大学 | Direct methanol fuel cell methanol solution concentration control device |
| CN202024977U (en) * | 2011-02-21 | 2011-11-02 | 山东省科学院生物研究所 | Fermentation online methanol detection device |
| CN102809634A (en) * | 2012-08-28 | 2012-12-05 | 济南大学 | Gas-sensitive sensor made of palladium hybridization ferroferric oxide nanometer material |
-
2016
- 2016-06-29 CN CN201610488029.8A patent/CN105866195A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004111212A (en) * | 2002-09-18 | 2004-04-08 | Yamaha Motor Co Ltd | Fuel cell system |
| CN1830112A (en) * | 2003-06-24 | 2006-09-06 | 日本电气株式会社 | Method for determining alcohol concentration, apparatus for determining alcohol concentration, and fuel cell system including such apparatus |
| CN101034751A (en) * | 2007-03-21 | 2007-09-12 | 清华大学 | Control method for the density of the direct carbinol fuel battery carbinol solution and the device |
| CN201117725Y (en) * | 2007-08-03 | 2008-09-17 | 清华大学 | Direct methanol fuel cell methanol solution concentration control device |
| CN202024977U (en) * | 2011-02-21 | 2011-11-02 | 山东省科学院生物研究所 | Fermentation online methanol detection device |
| CN102809634A (en) * | 2012-08-28 | 2012-12-05 | 济南大学 | Gas-sensitive sensor made of palladium hybridization ferroferric oxide nanometer material |
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Application publication date: 20160817 |