臺灣能源期刊第10卷第1期-臺灣能源期刊論文全文-能源期刊-能源知識庫

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臺灣能源期刊論文全文

出刊日期：March, 2023

Title: Improvement on Heat Benefit of Furnaces for Heating A 700 W Medium-Temperature Solid Oxide Fuel Cell

摘要: 固態氧化物燃料電池(SOFC)提供具有發展潛力的清潔能源，其電池系統(含燃料氣化及重整)都需在中、高溫(>500oC)操作，因此前完成之研究(李坤翔，2020)組製中溫爐(簡稱F01及F01+)可用於加熱及維持700 W中溫型固態燃料電池需在650oC~800oC間正常操作，然而前數據顯示操作期間電池組加熱成本高居所有成本因素的第一位，佔67.5%，熱效益不佳，使發電不具經濟效益。因此本研究提出新中溫爐設計，結合氣化與重整功能，並實際組裝兩種中溫爐體(簡稱F02及F02+)，進行測試，期望降低爐體持溫時之熱散失。數據顯示，新製爐體(F02)之熱散失功率(kW)與溫度(oC)的關係為P = 0.0011T – P(x)，其中P(F02) = 0.247，兩種F02爐之熱散失功率明顯小於前組(李坤翔，2020)製之 F01爐體，在操作的溫度區間其熱散失功率可減少一半，在800oC持溫時，熱散失功率由原先F01+之 1,000 W降低至F02+之500 W，因此發電成本也由9.58 (NT$/kWh)減少至5.15 (NT$/kWh)，加熱持溫成本佔總成本比例也由67.5%降至43.1%。700 W SOFC電池堆若在F02中升溫至650oC，持溫1小時所需的熱量為1.22 MJ。

Abatract: Solid oxide fuel cell (SOFC) is a clean energy source potentially for clean electric energy development, of which needs to operate at medium to high temperature (>500oC). Our previous works (Lee, 2020) assembled two furnaces (abbreviated as F01 and F01+) for heating and maintaining 700 W mediumtemperature (M-) SOFC stacks between 650oC~800oC. During the operation of the SOFC stack, the cost was the highest among all cost factors, accounting for 67.5%, and the thermal efficiency was improvable, so the power generation is economically viable. Therefore, this study proposed a new design that the furnace combined gasification and reforming function, and two medium-temperature furnaces were assembled (abbreviated as F02 and F02+ ) for testing. The data show that the relationship of power dissipation (in kW scale) of F02 furnace to the temperature (oC) is P = 0.0011T-P(x), where P(x) of F02 furnace is 0.247. The power dissipation of the two F02 furnaces is significantly improved about one time better and smaller than that of the F01 furnaces (Lee, 2020). When holding at 800oC, the power dissipation is reduced from 1,000 W of F01+ to 500 W of F02+. As a result, the cost of power generation has been reduced from 9.58 (NT$/ kWh) to 5.15 (NT$/kWh), and the proportion of heating and holding cost to total cost is reduced from 67.5% to 43.1%. The heat required to hold the temperature of a 700 W SOFC stack in F02 is 1.22 MJ if heated to 650oC.