| 摘要: | 本研究針對質子傳導型固態氧化物電解器（Proton-conducting Solid Oxide Electrolyzer, P-SOEC）結合有機朗肯循環（Organic Rankine Cycle, ORC）之複合系統進行模擬與分析，探討系統於不同操作條件下之整體性能與效率表現，並結合熱力學理論進行㶲分析，以評估系統內部能量轉換與不可逆損失情形。此外，亦從經濟角度進行初步成本評估，粗估氫氣生產成本，並探討在實際經濟波動及操作參數變化下，系統整體成本的變動趨勢。
模擬結果顯示，於基礎系統（CASE 1）中，操作參數如電堆溫度、蒸氣利用率、氮氣流量與元件熱損失率皆會對系統性能造成影響。在最佳操作條件下（低溫與高蒸氣利用率），CASE 1系統之電效率可達77.3 %，而於最差操作條件下（高溫與低蒸氣利用率）則降至66.6 %，兩者相差10.7 %。進一步優化之系統（CASE 2）於相同最佳操作條件下，其電效率可提升至78.4 %，較CASE 1增加1.1 %。
在成本分析方面，模擬結果指出，系統運行期間，總成本中以電力成本佔比最高，其次為元件成本與維護費用，顯示電價為影響氫氣生產成本之關鍵因素。在最佳操作條件下，CASE 1系統的產氫成本粗估為6.48 $/kg，而經過優化之CASE2系統可進一步降低至6.39 $/kg，產氫成本降低1.4 %。
綜合研究分析結果可知，CASE 2系統在維持相同系統規模與產氫輸出條件下，透過有效的熱管理設計與氮氣回收策略，成功降低元件耗損與整體運行能耗，提升系統運作效率與經濟性。
;This study focuses on the simulation and analysis of a hybrid system that integrates a Proton-conducting Solid Oxide Electrolyzer (P-SOEC) with an Organic Rankine Cycle (ORC). The research investigates the overall performance and efficiency of the system under various operating conditions and incorporates thermodynamic principles into the exergy analysis to assess internal energy conversion and irreversible losses Additionally, the research includes a preliminary cost analysis to estimate the hydrogen production cost and explore how the overall system cost responds to realistic economic fluctuations and variations in operating conditions.
Simulation results show that, in the baseline system (CASE1), operational parameters such as stack temperature, steam utilization rate, nitrogen flow rate, and component heat loss rate all influence system performance. Under optimal operating conditions (low temperature and high steam utilization), CASE1 achieves an electrical efficiency of 77.3 %, whereas under the worst operating conditions (high temperature and low steam utilization), it decreases to 66.6 %, representing a difference of 10.7 %. The further optimized system (CASE2), under the same optimal conditions, achieves an improved electrical efficiency of 78.4 %, representing a 1.1 % increase compared to CASE1.
In terms of cost analysis, simulation results indicate that during system operation, electricity cost constitutes the largest portion of the total cost, followed by component costs and maintenance expenses, highlighting electricity price as the key factor affecting hydrogen production cost. Under optimal operating conditions, the estimated hydrogen production cost of CASE1 is 6.48 $/kg, which can be further reduced to 6.39 $/kg in the optimized CASE2 system, reflecting a 1.4 % cost reduction.
Overall, the study concludes that the CASE2 system, while maintaining the same scale and hydrogen output, successfully reduces component degradation and overall energy consumption through effective thermal management and nitrogen recycling strategies, thereby enhancing both operational efficiency and economic viability. |
