超臨界二氧化碳動力循環的熱力學分析

Thermodynamic Analysis of the NET Power Cycle

陳亭睿(Ting-Rui Tan)

指導教授 ： 陳誠亮

國立臺灣大學/工學院/化學工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202102042

摘要

能源產業在台灣的所有產業中佔溫室氣體排量約90%，為了達到減碳目標，台灣政府計劃在2050年前使用天然氣發電的比例增加至50%，因為相比于煤炭，天然氣的碳排放量較少，是個清潔能源。為降低碳排放量，碳捕捉技術經常用在發電系統。本論文利用Aspen Plus軟體模擬一超臨界二氧化碳動力循環發電系統，利用天然氣作燃料，搭配富氧燃燒技術以便進行碳捕捉。研究的目的為透過探討各個操作條件對系統效率的影響，進行最適化，並達到最大發電效率。為減少耗能，本論文提出了空氣分離系統與發電系統的熱整合，結果顯示使最大發電效率為59.77%, 並且實現百分之百碳捕捉，證明了此系統優越的表現。

關鍵字

程序設計 ； 發電系統 ； 碳捕捉 ； 天然氣

並列摘要

The combustion of fossil fuel in energy industries produce about 90% of carbon emissions in Taiwan. Therein, power production sector is the major contributor, since more than 60% of fossil fuel is used for electricity generation. It is important to induce carbon capture technology into power plants in order to reach carbon reduction targets set by the government. Oxy-combustion cycle is one of the method to produce zero emmision power. This paper presents a simulation of an oxy-combustion cycle power plant called Net Power Cycle using Aspen Plus, which a flow-sheet featuring models of the main equipment units and fluid properties has been developed. The main goal of this study is to achieve maximum cycle efficiency. Sensitivity analyses on the cycle variables is done to find out their influence on the cycle’s performance, and optimization is done using iteration method. The main energy consumption in this power plants comes from the ASU (ASU), therefore this paper will suggest a heat integration method between the power plant and the ASU to reduce its overall power consumption. Results show that a maximum efficiency of 59.77% with 100% carbon capture can be achieved, proving the outstanding performance of the Net Power Cycle.

並列關鍵字

Process modeling ； Optimization ； Power Cycle ； Carbon Capture

參考文獻

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