利用半圓柱型吸附塔進行變壓吸附程序分離空氣之模擬研究;Simulation study of separating oxygen from air by PSA with semicylindrical adsorber

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Title:	利用半圓柱型吸附塔進行變壓吸附程序分離空氣之模擬研究;Simulation study of separating oxygen from air by PSA with semicylindrical adsorber
Authors:	張鑑舜;Chang, Chien-Shun
Contributors:	化學工程與材料工程學系
Keywords:	變壓吸附程序;熱交換;半圓柱型吸附塔;空氣;Pressure swing adsorption;Heat-exchange;Semicylindrical adsorber;Air
Date:	2018-01-30
Issue Date:	2018-04-13 10:48:36 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文研究以zeolite 5A分離空氣製造氧氣為對象，目標為利用模擬將兩個半圓型吸附塔與傳統雙圓柱型吸附塔變壓吸附分離程序做比較。半圓型吸附塔較傳統圓柱型吸附塔增加了熱補償效益，此效益有助於提升Skarstrom Cycle分離空氣製造氧氣的氧氣濃度。將空氣組成簡化為21%的氧氣、1%氬氣與78%的氮氣後，以extended Langmuir isotherm model描述其等溫平衡吸附曲線，再以線性趨動力質傳阻力模型描述其氣固間吸附質傳阻力。最後以傳統圓柱型吸附塔PSA模擬程式與文獻中實驗數據驗證，證實程式及參數的可靠度後，在符合經濟效益的操作條件下將其改成半圓型吸附塔並與傳統圓柱型吸附塔做比較。在探討完圓柱型及半圓型吸附塔各項變因後，可以得知當吸附塔由傳統的圓柱型改為半圓型後，其熱補償效益確實對分離空氣純化氧氣有所幫助。且在探討的範圍內，體積越大的裝置、越高的操作溫度下及越低的進料壓力下效益更加顯著。 ;This study utilizes zeolite 5A to separate oxygen from air in order to compare the performance of semicylindrical adsorber with that of traditional cylindrical adsorber for pressure swing adsorption. Semicylindrical adsorber can have better heat compensation during adsorption and desorption, which increases the oxygen purity in Skarstrom cycle. The air composition is simplified to 21% oxygen, 1% argon and 78% nitrogen. The extended Langmuir isotherm model is used to describe adsorption isotherms of gas components. Linear driving force model is used to describe the mass transfer resistance between gas and solid phase. Furthermore, the simulation program is verified with experimental data. The results show the reliability of program and parameters. Then, we built a PSA process with semicylindrical adsorbers under appropriate operating conditions and compared it with a PSA process with traditional cylindrical adsorbers. From the results of discussing the operating variables, heat compensation of semicylindrical adsorber does increase oxygen purity for oxygen separation from air, once the adsorber changed from cylindrical one into semicylindrical one. The benefit of heat compensation is more obvious for larger adsorber, higher operating and surrounding temperature, and lower feed pressure in the range of this study.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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