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標題: | 超音波霧化系統針對質子交換膜燃料電池雙極反應氣體增濕效率之探討 Exploration of the effect of ultrasonic atomization system on the fuul's humidification efficiency of PEMFC |
作者: | Cheng-Yuen Bai 白程元 |
指導教授: | 宋家驥 |
關鍵字: | 超音波霧化,增溼,霧化量,質子交換膜燃料電池, ultrasonic atomization,humidification,atomization rate,PEMFC, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | 利用超音波霧化增濕有設備體積小、霧化霧滴緻密增濕均勻、易補水等優點,本實驗室開發出一超音波霧化增濕系統,包含反應氣體加溫器、功率超音波霧化器以及超音波增濕瓶,反應氣體得到足夠的熱量,接著進入增濕瓶,高溫反應氣體與增濕瓶中霧化出之水霧進行熱交換,液態水霧相變成汽態水蒸氣與反應體體混合,進而達到增濕的效果,大幅提升反應氣體的相對濕度。本超音波霧化增濕系統可藉由調整霧化器驅動電壓改變霧化量,進而主動式的調整反應氣體之相對濕度,隨著霧化量上升,反應氣體之相對濕度也即時提升;改變霧化器壓電片之共振頻率,頻率越高水霧粒徑越小,較小的粒徑可增加反應氣體的增溼效率。空氣增濕效率較氫氣增濕佳,兩極反應氣體在流量1LPM~25LPM條件下,經增濕後之相對溼度皆可維持在90%以上。將此增濕系統應用於質子交換膜燃料電池,超音波霧化增濕可藉由改變霧化器之霧化量,主動式的控制電池陰極與陽極溼度維持一最佳值,使質子交換膜燃料電池有最佳的效能表現。 There are some advantages of utilizing ultrasonic atomization system such as small size of humidifier, average and intensive humidification, and easily access of water refilling. This study has developed a unique ultrasonic atomization humidification system, including reactant gas heater, power ultrasonic atomizer and ultrasonic humidifier. When reactant gas has obtained sufficient heat content and has entered humidifier, heat exchange between reactant gas and droplet will take place. Next, reactant gas will mix with vapor after droplet transfers to vapor so that humidification will be achieved, and relative humidity will be obviously enhanced. Mainly, there are two functions of ultrasonic atomization humidification system. First, in order to actively adjust reactant gas relative humidity, we adjust atomization rate by changing drive voltage of humidifier. Second, this system is able to alter resonant frequency of PZT. The higher the frequency, the smaller the droplet's mean diameter while smaller diameter can raise the efficiency of humidification. At least 90 percent of relative humidity can be maintained under the condition that the flow rate of anode and cathode's reactant gas is restrict to 1LPM to 25LPM. In order to actively control PEMFC’s humidification of cathode/anode to be a optimal value, we can adjust atomization rate of humidifier, and then the best performance of PEMFC achieved. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/30852 |
全文授權: | 有償授權 |
顯示於系所單位: | 工程科學及海洋工程學系 |
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