CN117571783A - Fuel cell pipeline detection method - Google Patents
Fuel cell pipeline detection method Download PDFInfo
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- CN117571783A CN117571783A CN202311518545.7A CN202311518545A CN117571783A CN 117571783 A CN117571783 A CN 117571783A CN 202311518545 A CN202311518545 A CN 202311518545A CN 117571783 A CN117571783 A CN 117571783A
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- 239000000446 fuel Substances 0.000 title claims abstract description 163
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000010992 reflux Methods 0.000 claims abstract description 64
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 239000008367 deionised water Substances 0.000 claims abstract description 47
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 47
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000011010 flushing procedure Methods 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 8
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 description 17
- 239000002244 precipitate Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 150000001449 anionic compounds Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 230000008707 rearrangement Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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Abstract
The invention belongs to the technical field of fuel cell detection, and discloses a fuel cell pipeline detection method which comprises the steps of flushing the inner wall of a cathode tube to be detected by steam and collecting reflux liquid; starting a fuel cell stack, introducing deionized water into the fuel cell stack, and recording a first impedance R1; testing in a constant current mode and judging through the difference V1-V2 between the average voltage V1 when the fuel cell stack is operated by introducing reflux liquid for a plurality of times and the average voltage V2 when the fuel cell stack is operated by introducing deionized water for a plurality of times; the constant voltage mode test is carried out, and the judgment is carried out through the difference value I1-I2 between the average current I1 when the fuel cell pile is operated by introducing reflux liquid for a plurality of times and the average current I2 when the fuel cell pile is operated by introducing deionized water for a plurality of times; and introducing the reflux liquid into the fuel cell stack, and recording a second impedance R2, and judging through R1-R2. The fuel cell pipeline detection method can detect the cathode tube of the fuel cell in situ and judge whether the cathode tube is qualified or not.
Description
Technical Field
The invention relates to the technical field of fuel cell detection, in particular to a fuel cell pipeline detection method.
Background
The membrane electrode assembly of a fuel cell is susceptible to various cationic and anionic or organic compound components, resulting in performance degradation. Particularly, the cathode pipeline of the fuel cell is in a high-temperature and high-humidity state for a long time, so that various harmful components are more quickly separated out. Therefore, the choice of material for the cathode tube is important.
The existing analysis test for the cathode tube of the fuel cell generally aims at the components and the content of the precipitate of the cathode tube, but no complete method can detect whether the cathode tube made of certain materials can be applied to the fuel cell, and whether the normal operation or the service life of the fuel cell can be influenced or not.
Therefore, a fuel cell pipeline detection method is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a fuel cell pipeline detection method which can detect a cathode tube of a fuel cell in situ, analyze the influence of the cathode tube on the fuel cell and judge whether the cathode tube applied to the fuel cell is qualified or not.
To achieve the purpose, the invention adopts the following technical scheme:
the fuel cell pipeline detection method comprises the following steps:
s100, flushing the inner wall of the cathode tube to be tested by utilizing steam, and collecting reflux liquid;
s200, starting the fuel cell stack, introducing deionized water into the fuel cell stack, and recording a first impedance R1;
s300, recording an average voltage V1 when the fuel cell stack is repeatedly fed with reflux liquid and an average voltage V2 when the fuel cell stack is repeatedly fed with deionized water, and judging that the cathode tube to be tested is unqualified if a voltage attenuation value delta V is greater than an upper limit D of the voltage attenuation value; otherwise proceeding to S400, wherein ΔV is equal to V1-V2;
s400, recording average current I1 when the fuel cell stack is repeatedly fed with reflux liquid and average current I2 when the fuel cell stack is repeatedly fed with deionized water, if the current attenuation value delta I is greater than the upper limit G of the current attenuation value, judging that the cathode tube to be tested is unqualified, otherwise, performing S500, wherein delta I is equal to I1-I2;
s500, introducing the reflux liquid into the fuel cell stack, and recording a second impedance R2, and if the impedance difference delta R is larger than the impedance change limit value H, judging that the cathode tube to be tested is unqualified; and otherwise, judging that the cathode tube to be tested is qualified, wherein DeltaR is equal to R1-R2.
As a preferred embodiment of the fuel cell pipeline detection method provided by the invention, the steam in the step S100 is deionized water steam.
As a preferable embodiment of the fuel cell line detection method provided by the present invention, the following steps are performed between step S100 and step S200:
s110, testing the conductivity sigma of the reflux liquid, and if the conductivity of the reflux liquid is larger than the conductivity upper limit value A, judging that the cathode tube to be tested is unqualified.
As a preferred embodiment of the fuel cell line detection method provided by the present invention, before step S300, the following steps are performed:
s310, introducing deionized water into the fuel cell stack until the voltage of the fuel cell stack is stable;
s320, alternately introducing reflux liquid and deionized water into the fuel cell stack for a plurality of times;
s330, when the operation of introducing the reflux liquid for a plurality of times is judged, the operation voltage Vj of the fuel cell stack is judged, and if the minimum value of the Vj is smaller than the voltage lower limit value B, the cathode tube to be detected is judged to be unqualified; and if the minimum value of the Vj is larger than the lower voltage limit value, performing constant current mode test.
As a preferred embodiment of the fuel cell line detection method provided by the present invention, between step S330 and step S300, the following steps are performed:
and S340, recording a voltage standard deviation S1 when the fuel cell stack is repeatedly fed with reflux liquid to operate, if the S1 is larger than an upper limit C of the voltage standard deviation, judging that the cathode tube to be tested is unqualified, and otherwise, performing constant current mode test.
As a preferred embodiment of the fuel cell line detection method provided by the present invention, before step S400, the following steps are performed:
s410, introducing deionized water into the fuel cell stack until the current of the fuel cell stack is stable;
s420, alternately introducing reflux liquid and deionized water into the fuel cell stack for a plurality of times;
s430, when the operation of introducing the reflux liquid for a plurality of times is judged, the operation current Ij of the fuel cell stack is judged, and if the minimum value of the operation current Ij is smaller than the current lower limit value E, the cathode tube to be detected is judged to be unqualified; and if the minimum value of Ij is larger than the current lower limit value, performing constant voltage mode test.
As a preferred embodiment of the fuel cell line detection method provided by the present invention, between step S430 and step S400, the following steps are performed:
s440, recording a current standard deviation S2 when the fuel cell stack is operated by introducing reflux liquid for a plurality of times, if S2 is larger than an upper limit F of the current standard deviation, judging that the cathode tube to be tested is unqualified, and otherwise, performing a constant current mode test.
As the preferable scheme of the fuel cell pipeline detection method provided by the invention, the upper limit F of the current standard deviation is the average value of the current standard deviation when the fuel cell pile is operated by introducing deionized water for a plurality of times.
As the preferable scheme of the fuel cell pipeline detection method provided by the invention, after the pass or fail of the cathode tube to be detected is judged, the fuel cell stack is closed.
As a preferred embodiment of the fuel cell line detection method provided by the present invention, after step S500, the following steps are required: the vessel in which the reflux was collected was drained.
The invention has the beneficial effects that:
in the fuel cell pipeline detection method provided by the invention, firstly, in step S100, steam is utilized to wash the inner wall of the cathode tube to be detected so as to simulate the most severe working environment of the cathode tube to be detected, and the precipitate on the inner wall of the cathode tube to be detected is dissolved in reflux liquid to form an experiment group. In step S200 and step S500, a first impedance R1 and a second impedance R2 are recorded, respectively, wherein the first impedance R1 is an impedance value of the fuel cell stack measured after deionized water is introduced into the fuel cell stack, and is a control group; the second impedance R2 is an impedance value of the fuel cell stack measured after the reflux liquid is introduced into the fuel cell stack, and is an experimental group formed after the fuel cell stack is sequentially subjected to constant current mode test and constant voltage mode test, and if the impedance difference delta R is R1-R2 and is larger than the impedance change limit value H, the cathode tube to be measured is judged to be unqualified; and otherwise, judging that the cathode tube to be tested is qualified. That is, the impedance change condition can be used as a criterion for judging whether the precipitate of the cathode tube to be tested has an excessive influence on the fuel cell stack, so as to judge whether the cathode tube to be tested is qualified. The fuel cell pipeline detection method provided by the invention also utilizes constant current mode test to take the difference V1-V2 between the average voltage V1 when the fuel cell pile is operated by introducing the reflux liquid for a plurality of times and the average voltage V2 when the fuel cell pile is operated by introducing the deionized water for a plurality of times as a judgment standard, so as to judge whether the cathode tube to be detected is qualified or not. And the constant voltage mode test is also utilized, and the difference value I1-I2 between the average current I1 when the fuel cell stack is operated by repeatedly introducing reflux liquid and the average current I2 when the fuel cell stack is operated by repeatedly introducing deionized water is used as a judgment standard to judge whether the cathode tube to be tested is qualified or not. That is, the fuel cell pipeline detection method provides a simple and clear judgment standard for judging whether the cathode tube to be detected is qualified or not, namely, the cathode tube to be detected is subjected to in-situ detection by comparing the voltage attenuation, the current attenuation and the impedance change conditions of the fuel cell stack when the reflux liquid and the deionized water are used, and whether the precipitate of the cathode tube to be detected is qualified or not is directly judged.
Drawings
FIG. 1 is a schematic diagram of a detection device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a vapor reflow mechanism according to an embodiment of the present invention;
fig. 3 is a flowchart of a fuel cell pipeline detection method according to an embodiment of the present invention.
In the figure:
10. a cathode tube to be measured;
20. a fuel cell stack; 21. an electrochemical performance testing module;
30. a steam reflux mechanism; 31. a first valve; 32. a heating jacket; 33. a container; 34. an interface tube; 35. a condensing tube; 36. a thermometer;
40. a return water tank; 41. a second valve; 42. a conductivity detector;
50. a deionized water tank; 51. a third valve;
60. a water pump;
70. a humidifier.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
Fig. 1 shows a schematic diagram of a detection device according to an embodiment of the present invention. Referring to fig. 1, the present embodiment provides a detection device that can be used to perform in-situ detection of a fuel cell line such as a cathode tube, analyze its effect on a fuel cell, and assist in determining whether the cathode tube applied to the fuel cell is acceptable.
The detection apparatus provided in this embodiment includes a fuel cell stack 20, a steam reflow mechanism 30, a reflow water tank 40, and a deionized water tank 50. The cathode tube 10 to be tested is mounted on the steam reflow mechanism 30, and the steam reflow mechanism 30 can wash the inner wall of the cathode tube 10 to be tested, and the obtained reflow liquid contains precipitates on the inner wall. A first valve 31 is provided in a passage between the steam reflux mechanism 30 and the reflux tank 40, and the steam reflux mechanism 30 is selectively communicated with the reflux tank 40 through the first valve 31. A second valve 41 is provided in the path between the return water tank 40 and the fuel cell stack 20, and a third valve 51 is provided in the path between the deionized water tank 50 and the fuel cell stack 20. The return water tank 40 and the deionized water tank 50 are selectively communicated with the fuel cell stack 20 through a second valve 41 and a third valve 51, respectively. The fuel cell stack 20 is completely new, and there are no factors other than the precipitation of the inner wall of the cathode tube 10 to be tested, which can affect the performance of the fuel cell stack 20.
Specifically, the detection device further includes a water pump 60. The water pump 60 is connected to the return water tank 40, and the steam return mechanism 30 is selectively connected to the water pump 60 through the first valve 31. The water pump 60 is capable of collecting the reflux liquid in the vapor reflux mechanism 30 into the reflux tank 40.
More specifically, the return tank 40 is provided with a conductivity detector 42, and the conductivity detector 42 is capable of detecting the conductivity of the return liquid in the return tank 40.
With continued reference to fig. 1, the detection apparatus also includes a humidifier 70. The humidifier 70 is in communication with the fuel cell stack 20, and the return water tank 40 and the deionized water tank 50 are in selective communication with the humidifier 70, respectively, the humidifier 70 being capable of carrying return water or deionized water into the fuel cell stack 20 via the cathode reactant gas. The humidifier 70 is a prior art, and the structure and principle of this embodiment are not described herein. In this embodiment, the cathode reactant gas is air.
Fig. 2 shows a schematic structural diagram of a steam reflux mechanism according to an embodiment of the present invention, and referring to fig. 2, the steam reflux mechanism 30 includes a heating jacket 32, a container 33, and a condensing tube 35. The cathode tube 10 to be tested is arranged above and communicated with the container 33, deionized water is contained in the container 33 and is located in the heating sleeve 32, the heating sleeve 32 can provide high temperature conditions for the cathode tube 10 to be tested, and the deionized water in the container 33 is heated to form deionized water vapor, and the deionized water vapor continuously washes the inner wall of the cathode tube 10 to be tested. The upper part of the cathode tube 10 to be measured is communicated with a condensing tube 35, the condensing tube 35 can condense the water vapor flushing the inner wall of the cathode tube 10 to be measured, and the liquid drops flow back to the container 33, and the backflow liquid flowing back to the container 33 contains the precipitate on the inner wall of the cathode tube 10 to be measured. The container 33 may be a flask, and the condenser 35 may be a bulb.
Specifically, the vapor return mechanism 30 further includes a mouthpiece 34. The interface tube 34 is inserted into the container 33 and is connected to the return water tank 40, so that the return liquid in the container 33 can be guided to the return water tank 40.
More specifically still, the vapor return mechanism 30 further includes a thermometer 36. The thermometer 36 is inserted into the container 33 for detecting the operating temperature.
With continued reference to fig. 1, the fuel cell stack 20 is externally connected with an electrochemical performance testing module 21 for detecting current, voltage, impedance, and other data of the fuel cell stack 20 in real time. The electrochemical performance testing module 21 is a prior art, and the structure and principle of this embodiment are not described herein.
Fig. 3 shows a flowchart of a fuel cell pipeline detection method according to an embodiment of the present invention. Referring to fig. 3, the present embodiment also provides a fuel cell pipeline detection method. The method for detecting the pipeline of the fuel cell is used for detecting the cathode tube of the fuel cell in situ, analyzing the influence of the cathode tube on the fuel cell and providing a simple and clear judgment standard for judging whether the cathode tube to be detected is qualified or not.
In the fuel cell pipeline detection method, firstly, a cathode tube 10 to be detected is assembled in a steam backflow mechanism 30, the steam backflow mechanism 30 is started, and step S100 is performed, namely, the inner wall of the cathode tube 10 to be detected is flushed by deionized water steam, the temperature of the steam backflow mechanism 30 is raised to Tc ℃, the flushing time is t1, and backflow liquid is collected in a backflow water tank 40. The inner wall of the cathode tube 10 to be tested is continuously flushed by water vapor under the high temperature condition, the running condition of the cathode tube 10 to be tested is simulated by using the severe condition, and the reflux liquid can more completely reflect the precipitate condition of the inner wall of the cathode tube 10 to be tested in the whole life cycle of the cathode tube 10 to be tested. In this embodiment, the flushing temperature Tc and the flushing duration t1 of the steam reflow mechanism 30 can be selected according to the physical and chemical characteristics of the cathode tube 10 to be tested and the electrochemical performance of the fuel cell stack 20 during actual detection, and the embodiment is not limited herein.
Preferably, after step S100, step S110 is further performed to test the conductivity σ of the reflux liquid, and if the conductivity of the reflux liquid is greater than the conductivity upper limit value a, it is determined that the cathode tube 10 to be tested is not qualified. The conductivity sigma of the reflux liquid can be directly obtained by adopting the conductivity detector 42, if the conductivity of the reflux liquid is too high, the ion content of the precipitate on the inner wall of the cathode tube 10 to be detected is too high, and the unqualified judgment conclusion of the cathode tube 10 to be detected can be obtained in advance. The upper limit value a of the conductivity in this embodiment may be flexibly set according to the electrochemical performance of the fuel cell stack 20, and the embodiment is not limited herein.
Then the following steps are sequentially carried out:
step S200, starting the fuel cell stack 20, and introducing deionized water into the fuel cell stack 20, after the time period t2, recording the first impedance R1 by using the electrochemical performance test module 21 after the fuel cell stack 20 is running stably. The specific value of the above-mentioned time period t2 is not limited in this embodiment, so as to ensure that the fuel cell stack 20 stably operates under the condition of introducing deionized water, so as to reduce the measurement error.
Step S300, testing voltage attenuation conditions.
Step S400, testing current attenuation conditions.
Step S500, introducing the reflux liquid into the fuel cell stack 20, recording a second impedance R2 after t3 time, and judging that the cathode tube 10 to be tested is unqualified if the impedance difference delta R is greater than the impedance change limit value H; and otherwise, judging that the cathode tube 10 to be tested is qualified, wherein DeltaR is equal to R1-R2. The specific value of the above-mentioned time period t3 is not limited in this embodiment, so as to ensure that the fuel cell stack 20 stably operates under the condition of introducing the reflux liquid, so as to reduce the measurement error. After the fuel cell stack 20 is subjected to a series of severe conditions such as constant current mode test and constant voltage mode test, if the difference between the second impedance R2 of the fuel cell stack 20 when the reflux liquid is introduced and the first impedance R1 of the fuel cell stack 20 when the deionized water is introduced is too large, the impedance change is obvious, and the cathode tube 10 to be tested is failed. The above-mentioned resistance change limit H can be flexibly set according to the electrochemical performance of the different fuel cell stacks 20, and the present embodiment is not limited herein.
With continued reference to fig. 3, prior to step S300, the following steps are performed:
step S310, deionized water is introduced into the fuel cell stack 20 until the voltage of the fuel cell stack 20 is stable;
step S320, alternately introducing reflux liquid and deionized water into the fuel cell stack 20 for a plurality of times;
step S330, when the operation of introducing the reflux liquid for a plurality of times is judged, the operation voltage Vj of the fuel cell stack 20 is judged, and if the minimum value of the operation voltage Vj is smaller than the voltage lower limit value B, the cathode tube 10 to be detected is judged to be unqualified; and if the minimum value of the Vj is larger than the lower voltage limit value, performing constant current mode test. On the premise of constant current, if the minimum value of the operating voltage Vj of the fuel cell stack 20 after the reflux liquid is introduced for many times is too small, it indicates that the performance attenuation of the fuel cell stack 20 is obvious, and it can be determined that the influence of the precipitate on the inner wall of the cathode tube 10 to be tested on the performance of the fuel cell stack 20 is too large, and the cathode tube 10 to be tested is failed. The lower voltage limit B may be flexibly set according to the electrochemical performance of the fuel cell stack 20, and the present embodiment is not limited herein.
Preferably, between step S330 and step S300, the following steps are performed:
step S340, recording the standard deviation S1 of the voltage when the fuel cell stack 20 is operated by introducing the reflow liquid multiple times, if S1 is greater than the upper limit C of the standard deviation of the voltage, it indicates that the voltage of the fuel cell stack 20 recorded each time is greatly fluctuated when the fuel cell stack 20 is operated by introducing the reflow liquid multiple times, and it indicates that the precipitate of the cathode tube 10 to be tested in the reflow liquid has obvious influence on the performance of the fuel cell stack 20, so that it can be determined that the cathode tube 10 to be tested is not qualified, otherwise, the constant current mode test is performed. The upper limit C of the standard deviation of the voltage may be flexibly selected according to the actual situation, and may be a standard deviation of the voltage when the fuel cell stack 20 is operated by introducing deionized water multiple times.
In the constant current mode test, recording an average voltage V1 when the fuel cell stack 20 is repeatedly fed with reflux liquid and an average voltage V2 when the fuel cell stack 20 is repeatedly fed with deionized water, and judging that the cathode tube 10 to be tested is unqualified if the voltage attenuation value delta V is larger than the upper limit D of the voltage attenuation value; and vice versa S400 is performed, wherein DeltaV is equal to V1-V2. The upper limit D of the voltage attenuation value may be flexibly set according to the electrochemical performance of the fuel cell stack 20, which is not limited in this embodiment.
With continued reference to fig. 3, after the constant current mode test is performed, before step S400, the following steps are performed:
step S410, deionized water is introduced into the fuel cell stack 20 until the current of the fuel cell stack 20 is stable;
step S420, alternately introducing reflux liquid and deionized water into the fuel cell stack 20 for a plurality of times;
step S430, when determining that the operation current Ij of the fuel cell stack 20 is operated by introducing the reflux liquid for a plurality of times, if the minimum value of Ij is smaller than the current lower limit value E, determining that the cathode tube 10 to be tested is not qualified; and if the minimum value of Ij is larger than the current lower limit value, performing constant voltage mode test. Under the precondition of constant pressure, if the minimum value of the running current Ij of the fuel cell stack 20 after the reflux liquid is introduced for many times is too small, the performance attenuation of the fuel cell stack 20 is obvious, and it can be determined that the influence of the precipitate on the inner wall of the cathode tube 10 to be tested on the performance of the fuel cell stack 20 is too large, and the cathode tube 10 to be tested is failed. The current lower limit value E may be flexibly set according to the electrochemical performance of the fuel cell stack 20, and the present embodiment is not limited herein.
Preferably, between step S430 and step S400, the following steps are performed:
step S440, recording the current standard deviation S2 when the fuel cell stack 20 is operated by introducing the reflux liquid for many times, if S2 is larger than the current standard deviation upper limit F, the current fluctuation of the fuel cell stack 20 recorded each time is large when the fuel cell stack 20 is operated by introducing the reflux liquid for many times, the precipitate of the cathode tube 10 to be tested in the reflux liquid has obvious influence on the performance of the fuel cell stack 20, and judging that the cathode tube 10 to be tested is unqualified, otherwise, performing the constant current mode test. The upper limit F of the current standard deviation may be flexibly selected according to the actual situation, and may be an average value of the current standard deviation when the fuel cell stack 20 is operated by introducing deionized water multiple times.
Specifically, in step S400, an average current I1 when the fuel cell stack 20 is operated with the reflux liquid being fed in for multiple times and an average current I2 when the fuel cell stack 20 is operated with the deionized water being fed in for multiple times are recorded, if the current attenuation value Δi is greater than the upper limit G of the current attenuation value, it is determined that the cathode tube 10 to be tested is not qualified, otherwise, step S500 is performed again, wherein Δi is equal to I1-I2. The upper limit G of the current attenuation value may be flexibly set according to the electrochemical performance of the fuel cell stack 20, which is not limited in this embodiment.
Before the Δr is recorded in step S500, and after it is determined that the cathode tube 10 to be tested is not acceptable in each step, it is necessary to shut down the fuel cell stack 20 and drain the return water tank 40.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A fuel cell line detection method, characterized by comprising:
s100, flushing the inner wall of the cathode tube (10) to be tested by utilizing steam, and collecting reflux liquid;
s200, starting the fuel cell stack (20), introducing deionized water into the fuel cell stack (20), and recording a first impedance R1;
s300, recording an average voltage V1 when the fuel cell stack (20) is repeatedly fed with reflux liquid and an average voltage V2 when the fuel cell stack (20) is repeatedly fed with deionized water, and judging that the cathode tube (10) to be tested is unqualified if the voltage attenuation value delta V is larger than the upper limit D of the voltage attenuation value; otherwise proceeding to S400, wherein ΔV is equal to V1-V2;
s400, recording an average current I1 when the fuel cell pile (20) is operated by introducing reflux liquid for a plurality of times and an average current I2 when the fuel cell pile (20) is operated by introducing deionized water for a plurality of times, and judging that the cathode tube (10) to be tested is unqualified if the current attenuation value delta I is larger than the upper limit G of the current attenuation value; otherwise S500 is performed, wherein ΔI is equal to I1-I2;
s500, introducing the reflux liquid into the fuel cell stack (20), recording a second impedance R2, and judging that the cathode tube (10) to be tested is unqualified if the impedance difference delta R is greater than the impedance change limit value H; and otherwise, judging that the cathode tube (10) to be tested is qualified, wherein DeltaR is equal to R1-R2.
2. The fuel cell line testing method according to claim 1, wherein the steam in step S100 is deionized water steam.
3. The fuel cell line detection method according to claim 1, wherein the following steps are performed between step S100 and step S200:
s110, testing the conductivity sigma of the reflux liquid, and if the conductivity of the reflux liquid is larger than the conductivity upper limit value A, judging that the cathode tube (10) to be tested is unqualified.
4. The fuel cell line detection method according to claim 1, characterized in that, before step S300, the following steps are performed:
s310, introducing deionized water into the fuel cell stack (20) until the voltage of the fuel cell stack (20) is stable;
s320, alternately introducing reflux liquid and deionized water into the fuel cell stack (20) for a plurality of times;
s330, when the operation of introducing the reflux liquid for a plurality of times is judged, the operation voltage Vj of the fuel cell stack (20) is judged, and if the minimum value of the operation voltage Vj is smaller than the voltage lower limit value B, the disqualification of the cathode tube (10) to be detected is judged; and if the minimum value of the Vj is larger than the lower voltage limit value, performing constant current mode test.
5. The fuel cell line detection method according to claim 4, wherein between step S330 and step S300, the following steps are performed:
and S340, recording a voltage standard deviation S1 when the fuel cell stack (20) is fed with reflux liquid for a plurality of times, and if the S1 is larger than an upper limit C of the voltage standard deviation, judging that the cathode tube (10) to be tested is unqualified, otherwise, performing a constant current mode test.
6. The fuel cell line detection method according to claim 1, characterized in that, before step S400, the following steps are performed:
s410, introducing deionized water into the fuel cell stack (20) until the current of the fuel cell stack (20) is stable;
s420, alternately introducing reflux liquid and deionized water into the fuel cell stack (20) for a plurality of times;
s430, when the operation of introducing the reflux liquid for a plurality of times is judged, if the minimum value of the operation current Ij of the fuel cell stack (20) is smaller than the current lower limit value E, judging that the cathode tube (10) to be detected is unqualified; and if the minimum value of Ij is larger than the current lower limit value, performing constant voltage mode test.
7. The fuel cell line detection method according to claim 6, wherein between step S430 and step S400, the following steps are performed:
s440, recording a current standard deviation S2 when the fuel cell stack (20) is operated by introducing reflux liquid for a plurality of times, and judging that the cathode tube (10) to be tested is unqualified if the S2 is larger than an upper limit F of the current standard deviation; and otherwise, performing constant current mode test.
8. The fuel cell line testing method of claim 7, wherein the upper current standard deviation F is an average of current standard deviations of the fuel cell stack (20) when operated with deionized water multiple passes.
9. The fuel cell line detection method according to claim 1, wherein the fuel cell stack (20) is shut down after the cathode tube (10) to be detected is judged to be acceptable or unacceptable.
10. The fuel cell line detection method according to claim 1, characterized in that after step S500, the following steps are required: the vessel in which the reflux was collected was drained.
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| CN202311518545.7A CN117571783A (en) | 2023-11-15 | 2023-11-15 | Fuel cell pipeline detection method |
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