本研究探討兩種不同攜帶介質：水與二氧化碳在氣化複循環發電(Integrated Gasification Combined Cycle, IGCC)系統中對製程產製合成氣的影響與能源效益。研究中發現，因為水的高熱容量以及高氣化熱，這些熱力性質會導致氣化效率偏低。為了進一步提升氣化效率，液態二氧化碳煤漿系統 被提出使用在氣化複循環發電兼二氧化碳捕獲系統。
本研究探討兩種不同攜帶介質：水與二氧化碳在氣化複循環發電(Integrated Gasification Combined Cycle, IGCC)系統中對製程產製合成氣的影響與能源效益。研究中發現，因為水的高熱容量以及高氣化熱，這些熱力性質會導致氣化效率偏低。為了進一步提升氣化效率，液態二氧化碳煤漿系統 被提出使用在氣化複循環發電兼二氧化碳捕獲系統。
本研究使用Aspen Plus軟體所模擬之IGCC單元，包含了氣化爐、水氣轉移反應器、酸氣捕捉以及二氧化碳捕獲區塊。參考美國國家能源技術實驗室(NETL)於2010年的報告，重製其水煤漿系統的模型，而後將攜帶介質換成液態二氧化碳，並比較兩個系統間的差異性。結果顯示，在相同的煤炭轉化率下，二氧化碳煤漿系統的合成氣熱值較水煤漿系統提高了8.63 %，冷氣效率值提高了6.84 %。因此液態二氧化碳攜帶介質對於提升IGCC系統的氣化效率是有幫助的。此外，在氫氣產量部分，二氧化碳煤漿系統提高了約8 %，二氧化碳捕獲的量相對於水煤漿系統也增加了10 %。
本研究也針對二氧化碳煤漿系統，分析了氣化爐中的主要參數(固體負載率、氧碳比)對IGCC系統的影響，結果顯示了在提高固體負載率以及氧碳比的情況下，合成氣熱值以及冷氣效率值皆是提高的。

In this study, we discuss two slurry systems, water and liquid carbon dioxide, in an Integrated Gasification Combined Cycle process. And the influence of slurry change on syngas production and energy analysis. Because the high heat capacity and high enthalpy of vaporization of water, these would lead to a low efficiency in gasifier. In order to improve the gasification efficiency, liquid carbon dioxide, CO2(l) has been proposed instead of coal-water system in the IGCC system with carbon capture.
Using Aspen Plus to simulation the IGCC process, including gasifier, water-gas shift reactor, acid gas removal and carbon dioxide capture. Reference to the National Energy Technology Laboratory (NETL) report in 2012, rebuild the coal-water slurry model. Then change the slurry medium to liquid CO2(l) and compare the differences between these two systems. The result shows that at the same coal conversion, the syngas HHV in CO2 slurry system is 8.63 % higher than water slurry system. The cold gas efficiency increased about 6.84 %. Therefore, liquid carbon dioxide slurry is helpful for enhancing the gasification efficiency. In addition, the H2 production in CO2 slurry system is 8 % higher than water slurry system, the amount of CO2 capture also increased about 10 %.
This study also discusses the influence of main parameters of the gasifier in CO2 slurry system, such as solids loading, oxygen to carbon ratio. The results shows that increasing the solids loading and oxygen to carbon ratio will improve the syngas HHV and cold gas efficiency.

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