| Summary: | 碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 96 === The raw gas produced from boiler which generates electricity by burning pulverized coal, after passing through gas clean up system and water gas-shift reactor, becomes the syngas with main components nitrogen, carbon dioxide and hydrogen. Hydrogen can be used as a fuel of fuel cells. Carbon dioxide is the greenhouse gas which creates the greenhouse effect. For energy and environment consideration, it is important to separate these two components and to handle them separately.
Pressure swing adsorption (PSA) is a simple, economical and effective gas separating method. For purifying the hydrogen and carbon dioxide form syngas, this study plans to develop a PSA system by using numerical simulation method. The simulation includes two stages. We want to handle the syngas which contains 10% nitrogen, 50% carbon dioxide and 40% hydrogen by using several process and adsorbent.
After confirming the accuracy of the simulation program, we design the equipment and process for two-stage PSA system. The operating condition and scale of the device are based on the components of syngas and feed flowrate. For stages 1 H2-PSA process, we use zeolite 5A and activated carbon as the adsorbent in order to concentrate the purity of hydrogen to 99% (recovery 80%). Stage 2 is CO2-PSA process, which is used to concentrate carbon dioxide from stage 1, and utilizes zeolite 13X as the adsorbent in order to concentrate the carbon dioxide purity to 90% (recovery 80%). The optimal operating conditions is obtained by changing the operating variables, such as feed pressure, adsorber length and step time. The simulation results get basic information for the after-IGCC factory design in future project.
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