利用變壓吸附程序濃縮含有水汽之氣化合成氣中氫氣及捕獲二氧化碳;Hydrogen Concentration and Carbon Dioxide Capture from Gasification Syngas with Moisture by Pressure Swing Adsorption Process

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Title:	利用變壓吸附程序濃縮含有水汽之氣化合成氣中氫氣及捕獲二氧化碳;Hydrogen Concentration and Carbon Dioxide Capture from Gasification Syngas with Moisture by Pressure Swing Adsorption Process
Authors:	周正堂
Contributors:	化學工程與材料工程學系
Keywords:	研究領域：化學工程類
Date:	2011-08-01
Issue Date:	2012-01-17 17:23:14 (UTC+8)
Publisher:	行政院國家科學委員會
Abstract:	全球暖化問題日益嚴重，其中二氧化碳及其他溫室氣體乃是造成全球暖化之主因。因此如何減緩二氧化碳之排放，已成為世界各國在降低溫室氣體影響方面的研究重點。減緩二氧化碳氣體排放主要包含回收與抑制等方式。回收方式是指將排放至大氣的二氧化碳利用物理、化學或是生物方式回收，常見的有吸收法、變壓吸附法、薄膜分離法、低溫蒸餾法等等，而其中變壓吸附法在節能上佔有較大之優勢，亦無二次污染之問題，故已被廣泛的應用在氣體分離上。而二氧化碳之排放最主要的來源為發電及工業界中利用天然氣或碳氫化合物產氫的製程上，目前經由氣化爐氣化煤炭後捕獲二氧化碳之技術，乃是先經由水煤氣轉化反應（water gas shift reaction），再經過冷卻器降溫以將水汽去除後再加以捕獲二氧化碳，之後再將氫氣等產物升溫以接續之後的發電程序，但此一先降溫後升溫的步驟增加了許多能源上的浪費。因水對一般吸附劑的強吸附性，從含水汽之氣化合成氣中同時分離二氧化碳及氫氣為頗困難的任務，因此本計畫擬研究於常溫及中高溫下，在含有水汽、一氧化碳、二氧化碳及氫氣等進料成份中，利用變壓吸附程序分離出二氧化碳及氫氣，以達到兼顧能源與環保的雙重目標。Because global warming has become more and more serious, which are caused by greenhouse gases,cutting down the emission of CO2 has already become one of the major research topics in the world. Several ways including physical, chemical and biological methods are studied to capture CO2 before it emits to atmosphere, such as chemical absorption, pressure swing adsorption (PSA), membrane separation, refrigeration/cryogenic etc. PSA performs better in saving energy and wouldn’t cause the second pollution, so it has been used widely in gas separation. The main sources of CO2 include the processes of generating electric power and producing hydrogen from natural gas and hydrocarbon. The CO2 which comes from coal is generated by gasifier and the water-gas-shift-reaction step of the process. The syngas after gasifier and water-gas-shift-reaction is cooled downed to remove water and to capture CO2 first in current technology, before the rest gas is heated again for power generation. However, the steps of cooling and heating cause the waste of energy. Besides, separating CO2 and H2 from syngas with moisture is difficult to achieve at the same time due to the strong adsorption of water .This study plans to use PSA process to separate high purity hydrogen and to capture CO2 from syngas under the condition of containing moisture, which contains water vapor, CO, CO2 and hydrogen at medium/high temperature. By PSA process, the goal of energy generation and environmental protection could be achieved at the same time. 研究期間：10008 ~ 10107
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Department of Chemical and Materials Engineering] Research Project

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