捕獲二氧化碳合成甲醇的製程效益分析

Process Benefit Analysis of Capturing Carbon Dioxide to Synthesize Methanol

黃偉勛(Wei-Hsun Huang)

指導教授 ： 張煖

淡江大學/工學院/化學工程與材料工程學系碩士班/碩士(2022年)

https://doi.org/10.6846/TKU.2022.00130

摘要

因應全球暖化問題之挑戰與預期可見碳交易平台之實現，二氧化碳捕獲與再利用技術成為實現碳中和目標之重要手段。針對二氧化碳捕獲與再利用議題，本技術報告選擇煙道氣所排放之二氧化碳為對象，評估二氧化碳捕獲暨接續氫化生產甲醇製程技術可行性。本研究以工研院既有的技術為基礎，就二氧化碳捕獲程序、二氧化碳氫化生產甲醇製程，以及二氧化碳氫化同時生產甲醇與CO之製程，完成相關規劃的技術評估，研究內容包含製程技術與物質系統物化性質資料蒐集、程序流程設計與模擬，以及經濟效益分析與碳排分析。
在二氧化碳捕獲程序技術評估方面，以二氧化碳 90%捕獲效率為基準，二氧化碳產物純度達99.8%以上，比較Shell Cansolv、MHI、工研院(ITRI)與傳統MEA等4項二氧化碳捕獲技術之程序性能，其中Shell和MHI已經有商業化的實績較佔優勢，而工研院的二氧化碳捕獲技術亦有具備燃煤電廠長期運作實證的經驗，擁有自主智慧財產權的技術，能就近服務國內業者，適合與國內業者合作發展相關技術。
在二氧化碳合成甲醇製程技術評估方面，在相同產能的條件下，相較於Lurgi與CAMERE製程，ITRI製程技術的操作條件相對溫和，設備與公用物流的成本相對較低，而且ITRI擁有高性能觸媒專利技術，在甲醇技術相較其他技術具有優勢。
在二氧化碳合成甲醇同步生產CO製程技術評估方面，現階段因限於化學平衡轉化率的關係，使得CO2氫化後產出的CO濃度較低，以致CO分離成本較高，現階段較不建議採用同時生產方式取得甲醇和CO。

關鍵字

碳捕捉 ； 碳循環 ； 二氧化碳 ； 氫化 ； 甲醇

並列摘要

In response to the challenge of global warming issue and the realization of carbon trading platform, carbon capture and utilization (CCU) is essential for the realization of the target of carbon neutralization. With respect to CCU, this technical report evaluates the carbon dioxide capture processes as well as the hydrogenation of carbon dioxide for the production of methanol and the coproduction of methanol and carbon monoxide. The tasks include information and data collection for process tehnologies and physico-chemical properties, process flowsheet design and simulation, economic analysis, and carbon emission analysis.
For CO2 capture, Shell Cansolv, MHI, ITRI, and traditional MEA technologies were studied. Shell and MHI processes have been commercialized. The CO2 capture technology of ITRI has been validated and obtained long-term operation experience in the coal-fired power plants of Taiwan, and this local proprietary technology can readily available for carbon capture with further coorporaton between ITRI and domestic industry for the development of related application technologies.
For the methanol synthesis from CO2, the technologies of ITRI, Lurgi and CAMERE were studied under the condition of same production capacity. The ITRI’s process can be operated under milder condition and can lead to lower production cost. This technology utilizes the unique patented high performance catalyst of ITRI.
The co-production of methanol and CO via hydrogenation of carbon dioxide, is not recommened due to the high cost for low-concentration CO separation.

並列關鍵字

Carbon capture ； Carbon recycle ； Carbon dioxide ； Hydrogenation ； Methanol

參考文獻

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