CN101997126A - Fuel concentration control method for fuel battery system fed with liquid fuel - Google Patents
Fuel concentration control method for fuel battery system fed with liquid fuel Download PDFInfo
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- CN101997126A CN101997126A CN2009100132940A CN200910013294A CN101997126A CN 101997126 A CN101997126 A CN 101997126A CN 2009100132940 A CN2009100132940 A CN 2009100132940A CN 200910013294 A CN200910013294 A CN 200910013294A CN 101997126 A CN101997126 A CN 101997126A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention relates to a fuel concentration control method for a fuel battery system taking liquid as fuel, comprising the step of: controlling the action of a fuel compensation control component through a pulse signal output by a control circuit by using a temperature sensor and a concentration sensor so as to control the fuel feeding concentration at the anode inlet of a galvanic pile in the system. During the starting stage and the stable running state of the system, the fuel concentration set values at the anode inlet of the galvanic pile are controlled as CS1 and CS2, wherein CS1 is greater than CS2. The method realizes the feeding of the high-concentration fuel (pure fuel) of the system, decreases the volume of the system, and shortens the starting time of the system; furthermore, the control circuit adopts the pulse signal to control the periodically intermittent action of the fuel compensation control component, thereby solving the problem that the dilution of the high-concentration fuel in the system is non-uniform and the response signal of the concentration sensor is stagnated. The method of the invention has the advantages of easy realization, high precision, reliable performance and the like.
Description
Technical field
The present invention relates to-kind be used for fuel concentration control method, be particularly useful for using the direct methanol fuel cell system of high concentration or pure methanol feeding with the fuel cell system of liquid fuel charging.
Background technology
With the fuel cell of liquid fuel charging is to be converted into a kind of electrochemical reaction appts of electric energy with being stored in chemical energy in the fuel (methyl alcohol, ethanol etc.).Compare with gaseous fuel, the micromolecule liquid fuel is easy to deposit and transportation, has higher energy conversion efficiency, and oxidation reaction product is mainly water and carbon dioxide, is eco-friendly green energy resource.
Direct methanol fuel cell (DMFC) is the most a kind of with research in the fuel cell of liquid fuel charging at present.That DMFC has is simple in structure, fuel does not need advantages such as reformation, is considered to one of very good removable power supply of miniaturization, has broad application prospects at aspects such as traffic, communication, military affairs, space flight.
The input concentration of methanol solution has very big influence to the performance of DMFC, and with the increase of methanol feed concentration, methanol crossover strengthens, and the methyl alcohol of infiltration forms mixed potential at the oxygen reduction reaction that negative electrode reacts with negative electrode, and cathode potential reduces, and battery performance descends.Therefore, in order to make the DMFC system with good and stable performance continuous discharge, must be with the charging of low concentration methanol solution, and the storage of low concentration methanol solution can make the volume of DMFC system increase, and is unfavorable for the application of DMFC system.
What solution to the problems described above normally continued replenishes high concentration methanol solution or pure methyl alcohol to system, by carrying the weight and volume that a spot of high concentration methanol solution or pure methyl alcohol reduce system, make system obtain long parallel-adder settle-out time simultaneously.
[United States Patent (USP) 6761988B1] introduced the element that is positioned at the annular seal space that is filled with controlling liquid when the DMFC power output than hour heating, the pressure that expansion of liquids produces is applied on pole plate, gas diffusion layers and the electrode, reduced to flow to the methyl alcohol of anode, otherwise then the pressure of annular seal space generation reduces, and has increased the methyl alcohol that flows to anode.Regulated methanol concentration by above-mentioned way, made that to be penetrated into negative electrode methyl alcohol minimized.The described micro-structural of this patent need utilize the MEMS technology to process, and is difficult for realizing.If every battery in the battery pack all adopts this method control methanol concentration can make system very complicated, cost is very high.
[Chinese patent 200710064632.4] introduced the size control methanol concentration according to the dump energy of the size of load and energy storage device.Detect the size of load, the dump energy and the mixed methanol concentration of energy storage device in real time, controller carries out computing according to above-mentioned information, regulated the flow of delivery pump by the mode of rotating speed of control delivery pump, when methanol concentration reduces the flow of delivery pump during greater than preset value, when methanol concentration increases the flow of delivery pump during less than preset value, concentration is controlled to preset value.Described concentration of methanol solution control method of this patent and device implement more complicated in fuel cell system, to having relatively high expectations of delivery pump, need to select the adjustable delivery pump of flow.The amount that need to detect is more, and the controller software complexity can have a negative impact to the stability of system.
[Chinese patent CN100433435C] introduced second group of membrane electrode being used in the work decided under the voltage and detected the concentration of first group of membrane electrode anode-side fuel, first group of electric current supply load that membrane electrode produces as the concentration detecting element.When fuel concentration≤set point+ε (ε is a concentration tolerance value), the concentration that enters first group of membrane electrode anolyte fluid fuel is heightened.The actuator that the described fuel concentration control method of this patent adds fuel such as the action of delivery pump are not done and are specified, and will keep temperature identical during detectable concentration, need add the temperature controlling organization.
Summary of the invention
The purpose of this invention is to provide a kind of fuel concentration control method that is used for the fuel cell system of liquid fuel charging, in the system start-up stage, the fuel concentration of pile anode inlet is controlled at higher state, initiatively utilize the temperature of the fuel of infiltration at cathode reaction liberated heat rising pile, during set point when stack temperature reaches system stable operation, the fuel concentration of pile anode inlet is controlled at lower state, suppress fuel infiltration, reduce the adverse effect that fuel infiltration brings for the pile performance.
In above-mentioned two different phases, the control of pile anode inlet place fuel concentration is the fuel concentration and the set point of different phase fuel-feed concentration that collects by concentration sensor relatively, and judges whether that by control circuit pulse signal that fuel supplement control assembly that high concentration fuel jar (pure tanks) leads to the fuel mix jar sends postcombustion realizes to controlling.The concrete control procedure of this method is as follows:
Detect the actual input concentration C of fuel at stack temperature T and pile anode inlet place in real time by the fuel concentration sensor at temperature sensor and pile anode inlet place, and at first judge the relation of stack temperature T and system stable operation desired temperature TS two kinds of situations of following A and B are arranged by control circuit.
A situation: in the system start-up stage, when being T≤TS, the fuel concentration at pile anode inlet place is controlled at set point CS1, specifically, be the relation of judging the fuel concentration set point CS 1 at the actual input concentration C of fuel at pile anode inlet place and pile anode inlet place by control circuit, also be divided into two kinds of concrete conditions of A1 and A2.
A1 situation: when C＜CS1, control circuit sends pulse signal to the fuel supplement control assembly that control high concentration fuel jar (pure tanks) leads to the fuel mix jar, the fuel supplement control assembly moves according to pulse signal, open afterwards earlier and close, so just step being passed in the fuel mix jar of high concentration fuel (pure fuel).Batch (-type) feeds fuel and is meant that each pulse period comprises that all the fuel supplement control assembly is opened and the fuel supplement control assembly is closed two processes, in fuel supplement control assembly opening process, high concentration fuel (pure fuel) is injected in the fuel mix jar, close in the closed procedure at the fuel supplement control assembly, the high concentration fuel of having injected (pure fuel) is evenly mixed at the solution of fuel mix jar with the crude fuel blending tank, the inaccurate problem of concentration signal that the concentration sensor of having avoided causing because of fuel mix is inhomogeneous obtains.After a pulse period finishes, according to this moment control circuit to the judged result of C and CS1 relation, whether the control circuit decision continues to send the next pulse signal to above-mentioned fuel supplement control assembly, if C＜CS1, then continue to send pulse signal, if the action of fuel supplement control assembly batch (-type) is C 〉=CS1, then stop to send pulse signal, the fuel supplement control assembly is failure to actuate.The relation of real-time judge C like this and CS1, corresponding, whether control circuit sends pulse signal according to the real-time selection of above-mentioned condition, and the fuel supplement control assembly also moves according to pulse signal cycle formula sexual refractoriness accordingly.
A2 situation: when C 〉=CS1, control circuit does not send signal, the fuel supplement control assembly that control high concentration fuel jar (pure tanks) leads to the fuel mix jar is failure to actuate, but with constantly carrying out of reacting in the pile, fuel concentration in the fuel mix jar constantly reduces, when the real-time concentration detected value C of concentration sensor＜CS1, control circuit sends pulse signal to the fuel supplement control assembly, pulse signal control fuel supplement control assembly is opened afterwards earlier and is closed, high concentration fuel (pure fuel) is just step to be passed in the fuel mix jar, the relation of real-time judge C like this and CS1, accordingly, control circuit judges whether to send pulse signal according to The above results, and the fuel supplement control assembly also moves according to pulse signal cycle formula sexual refractoriness accordingly.
B situation: after finishing in the system start-up stage, when being stack temperature T＞TS, the fuel concentration at pile anode inlet place is controlled at set point CS2, specifically, be the relation of judging the fuel concentration set point CS2 at the actual input concentration C of fuel at pile anode inlet place and pile anode inlet place by control circuit, also be divided into two kinds of concrete conditions of B1 and B2.
B1 situation: when C＜CS2, control circuit sends pulse signal to the fuel supplement control assembly, the fuel supplement control assembly is opened afterwards earlier according to pulse signal and is closed, high concentration fuel (pure fuel) is just step like this is passed in the fuel mix jar, after a pulse period finishes, according to this moment control circuit to the judged result of C and CS2 relation, whether the control circuit decision continues to send the next pulse signal to above-mentioned fuel supplement control assembly, if C＜CS2, then continue to send pulse signal, if the action of fuel supplement control assembly batch (-type) is C 〉=CS2, then stop to send pulse signal, the fuel supplement control assembly is failure to actuate.The relation of real-time judge C like this and CS2, corresponding, whether control circuit sends pulse signal according to the real-time selection of above-mentioned condition, and the fuel supplement control assembly also moves according to pulse signal cycle formula sexual refractoriness accordingly.
B2 situation: when C 〉=CS2, control circuit does not send signal, the fuel supplement control assembly is failure to actuate, but with constantly carrying out of reacting in the pile, fuel concentration in the fuel mix jar constantly reduces, when the real-time concentration detected value C of concentration sensor＜CS2, control circuit sends pulse signal to the fuel supplement control assembly, pulse signal control fuel supplement control assembly is opened afterwards earlier and is closed, high concentration fuel (pure fuel) is just step to be passed in the fuel mix jar, the relation of real-time judge C like this and CS2, accordingly, control circuit judges whether to send pulse signal according to The above results, and the fuel supplement control assembly also moves according to pulse signal cycle formula sexual refractoriness accordingly.
System stable operation desired temperature TS as mentioned above, its scope is: 50 ℃≤TS≤70 ℃.This mainly is that anode and cathode eelctro-catalyst activity is low excessively in the pile, influences the discharge performance of pile, can not satisfy the needs of system applies when being lower than 50 ℃ owing to the pile working temperature; And the pile working temperature is when being higher than 70 ℃, on the one hand, can influence the cathode performance of pile with the raise methanol crossover that aggravate of temperature, on the other hand, with the also increase thereupon of the needed power consumption of the normal operation of temperature rising whole system, is unfavorable for the application of system.
As mentioned above in the different phase of system operation, fuel concentration set point CS1 of pile anode inlet place and CS2, its scope is respectively: 1mol/L＜CS1≤2mol/L, 0.5mol/L≤CS2≤1mol/L.Use the fuel of higher concentration at system start-up stage pile, the fuel that utilizes infiltration is at cathode reaction liberated heat rising stack temperature, working temperature when making stack temperature under the condition that does not add other auxiliary equipment, be elevated to stable operation fast, but this moment, the concentration of fuel-feed also was difficult for too high, when fuel-feed concentration surpasses 2mol/L, because the fuel of infiltration may poison the eelctro-catalyst of pile negative electrode in cathode reaction, cause the pile discharge performance to be not easy to stablize, can not satisfy the needs of system applies.And after the temperature that when the temperature of pile is elevated to pile stable operation, needs, reduce the concentration that pile uses fuel, and improve the discharge performance of pile, make it satisfy the application need of system.At this moment, if the fuel-feed excessive concentration can cause the pile cathode performance to reduce because of fuel permeability is too high, if fuel-feed concentration is crossed low can the reduction because of the polarization of anode mass transfer causes the pile anode performance.Therefore, to be controlled at above-mentioned scope respectively comparatively suitable for the fuel-feed concentration of system being moved different phase.
The pulse signal that sends of control circuit as mentioned above, at least comprise one-period, the fuel supplement control assembly that control corresponding high concentration fuel jar (pure tanks) leads to the fuel mix jar moves once at least, promptly comprises an opening process at least and closes closed procedure.
Described fuel cell system with the liquid fuel charging, liquid fuel are two or more the fuel combination in micromolecule fuel such as methyl alcohol, ethanol, formic acid, ethylene glycol or the above-mentioned fuel.
The invention has the beneficial effects as follows and proposed a kind of fuel concentration control method that is used for the fuel cell system of liquid fuel charging, in the system start-up stage, pile uses the fuel of higher concentration, initiatively utilize the fuel of infiltration at the cathode reaction liberated heat, quick rising stack temperature, shortened the system start-up time, having omitted in the system start-up stage is the auxiliary equipment that system heats up; Normal operating phase after system start-up is finished, pile uses the fuel of low concentration, suppresses fuel infiltration, reduces the adverse effect that fuel infiltration brings for the pile performance; The control of fuel-feed concentration is to pass through fuel concentration sensor, control circuit and lead to by high concentration fuel jar (pure tanks) that the fuel supplement control assembly of fuel mix jar is common to be realized, the signal of control circuit output is a pulsed signal, and the manner of execution of corresponding fuel supplement control assembly is the manner of execution of cyclical intermission formula.Like this when electromagnetically operated valve is opened, high concentration fuel jar (pure tanks) can replenish a spot of high concentration fuel (pure fuel) for system, and when the fuel supplement control assembly is closed, high concentration fuel (pure fuel) can mix in system if having time, this fuel concentration control mode has been avoided measuring the concentration control that postpones to cause because of concentration sensor and has been forbidden, can improve the accuracy of fuel-feed concentration control, improve the control effect of fuel-feed concentration, guaranteed the long-term stability operation of system.The inventive method is specially adapted to use the direct methanol fuel cell system of high concentration methanol or pure methanol feeding.
Description of drawings
Fig. 1 is a kind of principle schematic that is used for the fuel concentration control method of the fuel cell system of liquid fuel charging provided by the invention.
Fig. 2 is the fuel concentration control circuit figure schematic diagram of a kind of fuel cell system with the liquid fuel charging provided by the invention.
Fig. 3 is a kind of being used for the action situation of the fuel concentration control method fuel supplement control assembly of the fuel cell system of liquid fuel charging and the real process schematic diagram of high concentration fuel or pure fuel supplement of the present invention.
Fig. 4 be among the embodiment 1 the 25W direct methanol fuel cell system start and running in stack temperature situation of change and change in concentration situation test result.
Fig. 5 be among the embodiment 2 the 25W direct methanol fuel cell system start and running in stack temperature situation of change and change in concentration situation test result.
Embodiment
The present invention proposes a kind of fuel concentration control method that is used for the fuel cell system of liquid fuel charging, below in conjunction with drawings and Examples the present invention is described in detail, but the present invention is not limited only to following examples.
As shown in Figure 1, it is a kind of principle schematic that is used for the fuel concentration control method of the fuel cell system of liquid fuel charging provided by the invention.
Comprise pile (1), pile (1) is provided with temperature sensor (2),
One fuel mixer (9) charging aperture links to each other with pile anode export pipeline with the discharging opening of fuel supplement control assembly (10) respectively, and fuel mixer (9) discharging opening links to each other with the pile anode inlet by fuel circulating pump (7),
On fuel circulating pump (7) and pipeline that the pile anode inlet links to each other, be provided with fuel concentration sensor (6), fuel concentration sensor (6) is connected with control circuit (8) input end signal with temperature sensor (2), and the output of control circuit (8) and fuel supplement control assembly (10) electrically connect;
Pile anode and fuel mixer (9) connecting line is provided with carbon dioxide separator (11),
The pile cathode inlet links to each other by the output of pipeline with air pump (12), is disposed with condenser (4) and separator (5) at pile cathode outlet place, and the water out of separator (5) is connected with fuel mixer (9).Arranged outside at condenser (4) has fan (3).
As shown in Figure 2, it is the fuel concentration control circuit schematic diagram of a kind of fuel cell system with the liquid fuel charging provided by the invention.This circuit is core with the single-chip microcomputer, wherein, adopts digital temperature sensor DS18B20 to measure stack temperature, and temperature sensor signal is directly inputted to the single-chip microcomputer of control circuit inside.The signal of fuel concentration sensor output is analog quantity mostly, needs through being input to the single-chip microcomputer of control circuit inside after the A/D conversion, as AT89C51; Also can be directly inputted to the single-chip microcomputer that itself has the A/D translation function, as ATmega8, ATmega16.The control signal of single-chip microcomputer output is controlled the opening and closing of being led to the fuel supplement control assembly of fuel mix jar by high concentration fuel jar (pure tanks) by elements such as triode, relays, thus the fuel concentration in the control fuel mix jar and the input concentration of pile anode inlet place fuel.
Fig. 3 is a kind of being used for the action situation of the fuel concentration control method fuel supplement control assembly of the fuel cell system of liquid fuel charging and the real process schematic diagram of high concentration fuel or pure fuel supplement of the present invention.In the system start-up stage, the fuel-feed concentration C that obtains when real-time detection is during less than set point CS1, control circuit leads to the fuel supplement control assembly output pulse signal of fuel mix jar to high concentration fuel jar (pure tanks), and corresponding the unlatching afterwards earlier of fuel supplement control assembly closed.When the fuel supplement control assembly was opened, high concentration fuel (pure fuel) was added in the fuel mixer; When the fuel supplement control assembly is closed, stop to add high concentration fuel (pure fuel) to the fuel mix jar, at this moment, the high concentration fuel of having added (pure fuel) under the effect of fuel circulating pump with fuel mixer in original fuel fully mix.Adopt this mode in fuel mixer, to replenish high concentration fuel or pure fuel, not only helping fuel mixes at short notice, also can avoid simultaneously because the fuel supplement that the hysteresis of concentration detection signal causes is excessive, thereby the fuel concentration that further makes pile anode inlet place is more near set point, improved the control precision of fuel-feed concentration in the system, improved concentration control effect, more helped long-term stability operation with the fuel cell system of liquid charging.
Fig. 4 be among the embodiment 1 the 25W direct methanol fuel cell system start and running in stack temperature situation of change and change in concentration situation test result.
Embodiment 1: it is the direct methanol fuel cell system of 25W that a power output is provided.Wherein, the fuel supplement control assembly adopts a liquid pump and the electromagnetically operated valve that flow is 7mL/min.Fuel supplement mechanism provides pure methanol liquid.The set point TS of stack temperature was 62 ℃ when system normally moved, and when stack temperature T≤62 ℃, the concentration of methanol solution set point CS1 of anode inlet place is 1.8mol/L, when the actual input concentration C of anode methyl alcohol＜1.8mol/L, and the control circuit output pulse signal.The time span of each signal period is 8s, wherein the startup 2s of fuel supplement control assembly elder generation then closes 6s, after the fuel supplement control assembly executes the additional order of primary fuel,, carry out such order once more if methanol feed concentration does not reach 1.8mol/L yet.Whenever execute a subcommand, control circuit can judge all whether decision continues postcombustion, till the actual input concentration of methyl alcohol reaches 1.8mol/L according to the actual input concentration of methyl alcohol.If when stack temperature did not surpass 62 ℃, the actual input concentration of methyl alcohol was lower than 1.8mol/L once more, repeats above-mentioned action.When stack temperature T＞62 ℃, the concentration of methanol solution set point CS1 of anode inlet place is 1.0mol/L, when the actual input concentration C of anode methyl alcohol＜1.0mol/L, and the control circuit output pulse signal.The time span of each signal period still is 8s, wherein the startup 2s of fuel supplement control assembly elder generation then closes 6s, if the actual input concentration of methyl alcohol still was lower than 1.0mol/L after interpolation was finished, the additional action before then the fuel supplement control assembly continues to repeat, on the contrary then stop to replenish pure methyl alcohol.In the above-described embodiments, be approximately 17min from the time that system start-up begins to reach to system normal working temperature.
Fig. 5 be among the embodiment 2 the 25W direct methanol fuel cell system start and running in stack temperature situation of change and change in concentration situation test result.
Embodiment 2: it is the direct methanol fuel cell system of 25W that a power output is provided.Wherein, the fuel supplement control assembly adopts the liquid pump that flow is 10mL/min.The set point TS1 of temperature was 60 ℃ when system normally moved, and when stack temperature T≤60 ℃, methanol feed concentration set point CS1 is 1.0mol/L, when the actual input concentration of anode methyl alcohol is lower than 1.0mol/L, and the control circuit output pulse signal.The time span of each signal period is 12s, and wherein the startup 2s of fuel supplement control assembly elder generation then closes 10s.After pure methyl alcohol interpolation is finished, if the actual input concentration of methyl alcohol does not reach 1.0mol/L yet, the additional action before then the fuel supplement control assembly continues to repeat, on the contrary then stop to replenish pure methyl alcohol for the pile system.When stack temperature T＞60 ℃, methanol feed concentration set point CS2 is 0.7mol/L, when the actual input concentration of methyl alcohol is lower than 0.7mol/L, control circuit control fuel supplement control assembly starts 2s earlier and then closes 10s, after pure methyl alcohol replenishes and finishes, if the actual input concentration of methyl alcohol still is lower than 0.7mol/L, the interpolation action before then the fuel supplement control assembly continues to repeat, on the contrary then stop to replenish M100 fuel for the pile system.In the above-described embodiments, be approximately 17min from the time that system start-up begins to reach to system normal working temperature.
Claims (6)
1. fuel concentration control method that is used for the fuel cell system of liquid fuel charging,
Described fuel cell system comprises pile (1) and fuel mixer (9), and pile (1) is provided with temperature sensor (2); It is characterized in that:
One fuel mixer (9) charging aperture links to each other with pile anode export pipeline with the discharging opening of fuel supplement control assembly (10) respectively, and fuel mixer (9) discharging opening links to each other with the pile anode inlet by fuel circulating pump (7); On fuel circulating pump (7) and pipeline that the pile anode inlet links to each other, be provided with fuel concentration sensor (6),
Fuel supplement control assembly (10) is arranged on the export pipeline of high concentration fuel jar or pure tanks; The output signal of fuel concentration sensor (6) and temperature sensor (2) is connected to the input of control circuit (8), and the output of control circuit (8) is electrically connected with fuel supplement control assembly (10);
Utilize temperature sensor and concentration sensor, the action of leading to the fuel supplement control assembly of fuel mixer by the pulse signal control high concentration fuel jar or the pure tanks of control circuit output, thus control is with the fuel-feed concentration at pile anode inlet place in the fuel cell system of liquid fuel charging.
2. according to the described fuel concentration control method of claim 1, it is characterized in that:
Stack temperature set point TS during initialization system stable operation, wherein, in the system start-up stage, the fuel concentration at control pile anode inlet place is set point CS1, initiatively utilize the fuel that permeates at pile cathode reaction liberated heat, the temperature when making stack temperature be elevated to system stable operation fast; After system start-up was finished, during set point TS when promptly stack temperature reaches system stable operation, the fuel concentration at control pile anode inlet place was set point CS2; The concrete control procedure of this method is as follows:
Detect stack temperature and fuel-feed concentration in real time, in the system start-up stage, when stack temperature T≤TS, control circuit (8) is controlled at CS1 with concentration, promptly when fuel concentration is lower than concentration set point CS1, by control circuit (8) output pulsed signal, the fuel supplement control assembly (10) that high concentration fuel jar or pure tanks are led to fuel mixer is opened afterwards earlier in a pulse period and is closed, the adding in the fuel mixer (9) of high concentration fuel or pure fuel cycle formula sexual refractoriness; When fuel concentration was higher than concentration set point CS1, control circuit (8) stopped output signal, and fuel supplement control assembly (10) is closed, and no high concentration fuel or pure fuel supplement are in fuel mixer (9);
Detect stack temperature and fuel-feed concentration in real time, after finishing in the system start-up stage, when stack temperature T＞TS, control circuit (8) is controlled at CS2 with concentration, promptly when fuel concentration is lower than concentration set point CS2, by control circuit (8) output pulsed signal, the fuel supplement control assembly (10) that leads to fuel mixer (9) by high concentration fuel jar or pure tanks is opened afterwards earlier in a pulse period and is closed, the adding in the fuel mixer (9) of high concentration fuel or pure fuel cycle formula sexual refractoriness; When fuel concentration was higher than concentration set point CS2, control circuit (8) stopped output signal, and fuel supplement control assembly (10) is closed, and no high concentration fuel (pure fuel) adds in the fuel mixer (9); The relation of two concentration set point is CS1＞CS2.
3. according to the described fuel concentration control method of claim 2, it is characterized in that: when stack temperature is 50 ℃≤TS≤70 ℃, be the described system start-up stage, the fuel concentration set point at pile anode inlet place is CS1, and 1mol/L＜CS1≤2mol/L; After described system start-up was finished, the fuel concentration set point at pile anode inlet place was CS2, and 0.5mol/L≤CS2≤1mol/L.
4. according to the described fuel concentration control method of claim 3, it is characterized in that: described pulsed signal by control circuit (8) output comprises the action of one-period at least.
5. according to the described fuel concentration control method of claim 1, it is characterized in that: described fuel supplement control assembly (10) is formed jointly for electromagnetically operated valve, liquid pump or by above-mentioned two kinds of parts.
6. according to the described fuel concentration control method of claim 1, it is characterized in that: described fuel is two or more the fuel combination in methyl alcohol, ethanol, formic acid or ethylene glycol or the above-mentioned fuel.
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| CN105762398A (en) * | 2014-12-16 | 2016-07-13 | 中国科学院大连化学物理研究所 | Fuel cell combined power supply system and control method thereof |
| CN107026276A (en) * | 2016-01-30 | 2017-08-08 | 中兴电工机械股份有限公司 | Fuel mixing apparatus, fuel cell system, and fuel mixing and transporting method |
| CN109873184A (en) * | 2017-12-05 | 2019-06-11 | 中国科学院大连化学物理研究所 | A kind of fuel liquid battery pile starting control method |
| WO2019109844A1 (en) * | 2017-12-04 | 2019-06-13 | 中国科学院大连化学物理研究所 | Direct liquid fuel cell power generation device |
| CN109935866A (en) * | 2017-12-19 | 2019-06-25 | 中国科学院大连化学物理研究所 | A method of for liquid fuel cell system cold-starting |
| CN114639850A (en) * | 2020-12-16 | 2022-06-17 | 中国科学院大连化学物理研究所 | Concentration optimization control method for liquid fuel cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6761988B1 (en) * | 2000-11-21 | 2004-07-13 | Mti Microfuel Cells Inc. | Fuel cell system with active methanol concentration control |
| JP4455385B2 (en) * | 2005-03-31 | 2010-04-21 | 株式会社東芝 | Direct methanol fuel cell system and control method thereof |
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| CN105762398A (en) * | 2014-12-16 | 2016-07-13 | 中国科学院大连化学物理研究所 | Fuel cell combined power supply system and control method thereof |
| CN105762398B (en) * | 2014-12-16 | 2018-05-25 | 中国科学院大连化学物理研究所 | A kind of fuel battery combination power-supply system and its control method |
| CN107026276A (en) * | 2016-01-30 | 2017-08-08 | 中兴电工机械股份有限公司 | Fuel mixing apparatus, fuel cell system, and fuel mixing and transporting method |
| WO2019109844A1 (en) * | 2017-12-04 | 2019-06-13 | 中国科学院大连化学物理研究所 | Direct liquid fuel cell power generation device |
| US11302939B2 (en) * | 2017-12-04 | 2022-04-12 | Dalian Institute Of Chemical Physics, Chinese Academy Of Sciences | Direct liquid fuel cell power generation device |
| CN109873184A (en) * | 2017-12-05 | 2019-06-11 | 中国科学院大连化学物理研究所 | A kind of fuel liquid battery pile starting control method |
| CN109935866A (en) * | 2017-12-19 | 2019-06-25 | 中国科学院大连化学物理研究所 | A method of for liquid fuel cell system cold-starting |
| CN109935866B (en) * | 2017-12-19 | 2022-01-28 | 中国科学院大连化学物理研究所 | Method for low-temperature starting of liquid fuel cell system |
| CN114639850A (en) * | 2020-12-16 | 2022-06-17 | 中国科学院大连化学物理研究所 | Concentration optimization control method for liquid fuel cell |
| CN114639850B (en) * | 2020-12-16 | 2024-03-12 | 中国科学院大连化学物理研究所 | Concentration optimization control method for liquid fuel cell |
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