操作參數對直接甲醇燃料電池PAHs排放之影響

Effect of operational parameters on the emission of PAHs from a DMFC

廖育賢(Yu-Hsien Liao)

指導教授 ： 黃國林

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2010年)

https://doi.org/10.6346/NPUST.2010.00130

摘要

直接甲醇燃料電池 (Direct Methanol Fuel Cell, DMFC) 之碳材組件，常含有或吸附有機污染物，如多環芳香烴 (Polycyclic Aromatic Hydrocarbons, PAHs)，可能於電池運作時，隨尾氣排放，影響空氣品質。因此，本研究主要探討操作參數對直接甲醇燃料電池排放PAHs之影響。
研究結果顯示在各試驗操作條件組合中，以陽極甲醇流量2 mL/min、陰極氧氣流量150 mL/min及電池溫度80℃操作下，有最高陰極氣相總PAHs及毒性當量 (BaPeq) 排放濃度 (分別為21±5 μg/m3及338±185 ng/m3)。電池操作溫度60℃時，則有較高陽極水相總PAHs及毒性當量排放濃度 (分別為182±37 μg/L及2203±277 ng/L) 與陰極水相總PAHs及毒性當量排放濃度 (分別為159±19 μg/L及1486±109 ng/L)。所測試之兩種商業化膜電極組，E-TEK排放較高之氣及液相總PAHs，但HE之毒性當量排放濃度較高。電池在80℃操作下較60℃者有較佳效能。

關鍵字

直接甲醇燃料電池 ； 多環芳香烴 ； 排放 ； 膜電極組

並列摘要

The carbon materials/components used in direct methanol fuel cells (DMFCs) usually contain/adsorb polycyclic aromatic hydrocarbons (PAHs) that may desorb and be emitted from DMFC off-gases during operation to influence air quality. Therefore, this study investigated effect of operational parameters on the emission of PAHs from a single DMFC.
Among tested condition combinations, the cathode gas-phase Total-PAHs and toxicity equivalent (BaPeq) emission concentrations were the highest (21±5 μg/m3 and 338±185 ng/m3, respectively) at anode methanol flowrate of 2 mL/min, cathode oxygen flowrate of 150 mL/min, and cell temperature of 80 °C. Greater than those at 80 °C, the anode liquid-phase Total-PAHs and BaPeq were 182±37 μg/L and 2203±277 ng/L, respectively, while the cathode liquid-phase Total-PAHs and BaPeq were 159±19 μg/L and 1486±109 ng/L, respectively, at 60 °C. Two brands of commercial membrane electrode assemblies (MEAs) were tested for comparison. The E-TEK MEAs exhibited greater gas- and liquid-phase Total-PAHs than the HE ones whereas a reverse trend was observed for their Total-BaPeq emission. The cell had a better performance at 80 °C than at 60 °C.

並列關鍵字

Direct methanol fuel cells ； Polycyclic aromatic hydrocarbons (PAHs) ； Emission ； Membrane electrode assemblies (MEAs)

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