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PEMFC燃料电池的运用研究

时间:2021-08-29 来源:未知 编辑:梦想论文 阅读:
Abstract: through the anode and cathode side vertical loading of different polar (Arctic and Antarctic) magnetic field at the anode side and the vertical load of different intensity (0 mT, 210 mT, 310 mT and 390 mT) and different properties (non uniform, uniform magnetic field), the effects of different loading modes and different nature of the magnetic field the environment of proton exchange membrane fuel cell (PEM-FC) performance. The magnetic field can improve the output power of the fuel cell. When loading the anode side of the magnetic pole, the performance of PEMFC is the best, the maximum power density reached 65.66 mW/cm2. under the same magnetic field strength, the output power density of inhomogeneous magnetic field when loading fuel cell loading were higher than those in uniform magnetic field.
 
Key words: magnetic field; proton exchange membrane fuel cell (PEMFC); loading method; polarity; strength.
 
In proton exchange membrane fuel cell (PEMFC) anode, hydrogen is ionized, release electrons and protons produced, the proton in the membrane to form hydrated proton migration to the cathode; at the cathode, oxygen electrode and electrolyte Proton Electronic in formation water, influence from thin proton exchange membrane to the anode [1]. the electrochemical reaction process by magnetic field, not only depends on the energy factor, also depends on the factors in the reaction system entropy. Under the external magnetic field, there are two kinds of magnetic forces that affect the electrochemical reaction [2]:
 
The magnetic fluid dynamics, produced by the movement of charged reactants or products in the field, satisfies the Lorenz equation [3], at right angles to the direction of valence electron flow direction and the Lorenz force, so moving particles in a magnetic field affected by magnetic field. The influence of magnetic field and the resultant flow near the electrode gas (water) diffusion, thus changing the reaction speed of [4]; the magnetic gradient force, due to the non-uniform magnetic field of the electrochemical reaction of molecular paramagnetism, reduction of electromagnetic active substances associated with the magnetic field strength, magnetic field gradient and oxidation, exists only in non uniform the magnetic field of [5], gas into the fuel cell by magnetic force, and promote the reaction of [6].PEMFC, current electrochemical reactions can be reduced to material electric susceptibility and magnetic field through the oxidation of non uniformity to change.
 
The author of this paper in order to improve the energy conversion rate of PEMFC by changing the external loading field, using different forms of magnetic field intensity and magnetic field type and arrangement, different field environment changes of fuel cell performance.
 
1 experiment.
 
1.1 experimental program.
 
The flat structure of the PEMFC, made from polylactic acid (PLA), Nafion 115 plastic bipolar plate of proton exchange membrane components (Du Pont) and SUS304 stainless steel grid plate collector, working area of 26.5 mm * 26.5 mm.
 
The non-uniform magnetic field and the uniform magnetic field are produced by NdFeB permanent magnet (Shanghai) and magnetic machine (Mianyang), and the intensity is measured by PF-035S Gauss (Mianyang).
 
The hydrogen oxygen (99.999%), (99.999%) as fuel, hydrogen flow rate is 100 ml/min, the oxygen flow rate of 120 ml/min. gas heating temperature is 30 DEG C, the operating temperature is 25 DEG C, the ambient temperature is about 25 degrees celsius. The fuel cell is connected to FCTS50H fuel cell test system (United States), set a fixed time interval, collect and record data, thereby measuring the polarization curve, the average output power curve data, energy efficiency inspection of fuel cell. In order to maintain the stability of the test equipment and the initial test conditions of the experimental group, the interval of each experiment is 2 h.
 
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1.2 experimental process.
 
The first test level two PLA plastic bipolar plate to shield the magnetic field, in the two layer of bipolar plate loaded on both sides of 210 mT, 310 mT and 390 mT magnetic field, the magnetic field strength between the bipolar plate is 209 mT, 308 mT and 388 mT, the magnetic shielding is less than 2 mT (about 1%), can be ignored.
 
The influence of the magnetic field loading method is studied, and the magnetic field is perpendicular to the anode and the cathode side respectively, and the influence of the magnetic field on the performance of the fuel cell is analyzed in different directions. In the experiment respectively in fuel cell anode, cathode side, vertical loading area of NdFeB 26 mm * 26 mm and 10 mm in thickness and surface magnetic field strength of 310 mT permanent magnet, the magnetic field in the anode side of the Arctic, the Antarctic, the anode side and the cathode side of the cathode side of the Arctic Antarctic in 4 ways.
 
In order to investigate the effects of different magnetic fields, the non-uniform and uniform magnetic field of different intensity are loaded on the anode side of the battery, and the influence of the magnetic field and the magnetic field intensity on the performance of the fuel cell is discussed. In the experiment, 4 mT (i.e., no magnetic field), 210 mT, 310 mT and 390 mT, respectively, were selected to be loaded on the anode side of the fuel cell, and the magnetic field of the 0 kinds of magnetic field was added. In order to compare the inhomogeneous magnetic field and uniform magnetic field influence on the working performance of the fuel cell, using the magnetic machine to produce a uniform magnetic field, the magnetic field strength machine output related to the input current, by changing the current, can obtain uniform magnetic fields of different intensities. The experimental current is 4.78 A, 7.91 A and 9.76 A, respectively, and the same as the permanent magnet with the same magnetic field of 210 mT, 310 mT and 390 mT, respectively.
 
2 results and discussion.
 
2.1 the influence of magnetic field on the performance of fuel cell.
 
The polarization curves and power density curves of the fuel cell under different magnetic field loading conditions are shown in figure 1.
 
As can be seen from Figure 1, the current density increases with the decrease of the voltage of the fuel cell. The anode vertical loading of magnetic field, the fuel cell ohmic polarization region the slope of the linear part of the smallest, without magnetic field when the battery (slope area of ohm polarization linear part), the external magnetic field under the condition of the cell polarization resistance decreases, the battery performance is greatly improved. The power density increases first and then decreases, the current density in the 160 ~ 170 mA/cm2, with a maximum power density of fuel cell anode loading magnetic pole is 65.66 mW/cm2, the anode pole is 63.10 mW/cm2 loading, the cathode magnetic field of 62 05mW loading Arctic / cm2 loading is 61.32 pole cathode mW/cm2 does not load the magnetic field is 61.38 mW/cm2. thus, loading an external magnetic field can increase the output power of the fuel cell, but the degree of improvement associated with loading. On the anode side of the fuel cell loaded with the Arctic magnetic field, the work performance is optimal, and the power density is also improved, with an increase of 7 0%. with no magnetic field
 
2.2 effect of uniform magnetic field and non-uniform magnetic field on the performance of fuel cells.
 
Due to the influence of the external environment, the working process of the fuel cell needs a certain period of time to run smoothly. The influence of magnetic field on the electrochemical reaction rate of fuel cell, the fuel cell with different magnetic field strength under non-uniform and uniform magnetic field, the variation of current with time is shown in Figure 2
 
It can be seen from Figure 2 that the stability time of the fuel cell is reduced, regardless of whether the anode side is loaded with non-uniform or uniform magnetic field, and the stable state of the fuel cell is 30 min under the action of the magnetic field. After loading the current magnetic field are not loaded when a magnetic field of 1.224 A, when the magnetic field strength of 210 mT, 310 mT and 390 mT, the output current of the inhomogeneous magnetic field conditions were 1.291 A, 1.319 A and 1.337 A, respectively, increased 5.9%, 7.6% and 9.2%; the current condition of uniform magnetic field were 1.263 A, 1.280 A and 1.297 A, respectively, increased 3.2%, 4.6% and 6 0%. in spite of the different magnetic field can increase the output current, but the output current of the fuel battery loaded with non uniform magnetic field uniform magnetic field is greater than that of loading, in the magnetic field strength of 210 mT, 310 mT and 390 mT, respectively. The difference between the 2.7%, 3% and 3 2%.
 
The power density of the fuel cell anode perpendicular to the direction of the magnetic field is different when the magnetic field intensity is different from that of the uniform magnetic field. The corresponding polarization curve is shown in Figure 4. Figure 3
 
It can be seen from Figure 3 that when the test system is started, the power density of the fuel cell is higher than that of the loaded magnetic field when the magnetic field is uniform or not. Under the same magnetic field strength, non uniform slope of the linear part of the ohmic polarization region under magnetic field than the uniform magnetic field is flat, the fuel cell of non-uniform magnetic field, the output performance of the fuel cell is higher than that of the uniform magnetic field, when the magnetic field strength is 390 mT, the maximum power density of 67.62 mW/cm2 and 70.30 mW/cm2. respectively.
 
From Figure 4 we can see, the slope of the fuel cell linear ohmic polarization region the largest portion of the magnetic field is applied, in a certain range, with the increase of magnetic field intensity, ohmic polarization region linear slope is more and more small, show the presence of a magnetic field is equivalent to reducing the internal resistance of fuel cell, so as to enhance the work performance of the fuel cell.
 
3 conclusion.
 
In this paper, the effects of different magnetic fields and different magnetic fields on the working performance of PEMFC were tested:
 
The effects of magnetic field and magnetic field on the performance of fuel cell are different. The experimental test of different magnetic loading performance impact on the battery found in the fuel cell anode side vertical loading Arctic, Antarctic, the anode side of the cathode side and the cathode side of the Antarctic polar magnetic field, power density of the battery anode side of the Antarctic maximum value is 63.10 mW/cm2, the cathode side polar battery power density maximum is 62.05 mW/cm2. The battery power density cathode side Antarctic maximum value is 61 32mW/cm2, the battery performance optimal anode side polar magnetic field, the battery output power density can be increased to 65.66 mW/cm2, compared with the magnetic field of the battery up to 7 0%.
 
The output power density of the fuel cell is different when the magnetic field of the anode side of the battery is vertically loaded with different magnetic fields with different properties (non-uniform and uniform) and different intensities (0, 210, 310 and 390 mT). In the same magnetic field strength under non-uniform magnetic field than the fuel cell under the uniform magnetic field better battery performance, to 390 mT non uniform and uniform magnetic field in the load, the maximum power density can reach 70.30 mW / cm2 and 67.62 mW/cm2, the power density increased by 14.5% and 10 than that without magnetic field 2%. the battery
 
Reference
 
[1] CHEN Dong-hao (Chen Donghao), BU Qing-yuan (Bu Qingyuan), CHEN Wei-rong (Chen Weirong), et al. PEMFC air cooling type anode exhaust cycle experiments of [J]. Battery Bimonthly (battery), 2015,45 (1): 3 -5.
 
[2] JIANG Bin-zhi (Jiang Bingzhi), YANG Jian-mei (Yang Jianmei). Effect of magnetic field on some chemical reactions [J]. (chemical Bulletin), 1991, (): 11- Chemistry
 
[3] LI Feng-chao (Li Fengchao), WANG Li (Wang Li), WU Ping (Wu Ping), etal. of oxygen in a gradient magnetic field flow and diffusion behavior of [J]. Journal ofEngineering Thermophysics (Engineering Thermophysics), 2011,32 (11): 1907 - 1909
 
[4]ZHONG Zhi-dan (Zhong Zhidan), WANG Bing-xue (Wang Bingxue), YANGQing-xia (Yang Qingxia), et al. PEMFC based on the electromagnetic field distribution of current research on [J]. real-time non-contact measurement of Journal of System Simulation (Journal of system simulation), 2014,26 (12): 3003 -3 6
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