化学吸收法%2f变压吸附法脱除沼气中co2的实验研究

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1、化学吸收法／变压吸附法脱除沼气中cos的实验研究化学吸收实验结果表明：在DEA吸收液中添加Na2C03或K：C03能促进其对C02的吸收，且低浓度无机碱促进效果明显。含钾碱混合吸收液对C02的吸收效果要优于含钠碱的混合吸收液，DEA与钾碱对于脱除模拟沼气中的C02有一定协同作用。无机碱的含量较高有利于吸收液再生。随着吸收液总浓度的增加，C02吸收量和吸收速率都会随之上升，但上升幅度会有一定下降。较佳的吸收液条件为：总浓度2．0mol／L，其中DEA浓度1．9mol／L。随着空塔气速的增加，C02去除率迅速下降，而传质系数和吸收速率上升。较大的吸收剂喷淋密

2、度和较高的温度均有利于C02吸收。在较佳实验条件下，DEA／Na2C03吸收液吸收效果(其C02饱和吸收量、C02去除率、再生率能分别达到1．969mol／L、82．45％、81．58％)与同浓度的DE舳EA相当。关键词：沼气；二氧化碳；化学吸收；无机碱；二乙醇胺；变压吸附化学吸收法／变压吸附法脱除沼气中C02的实验研究STUDYONREMO、厂ALOFCARBONDIOⅪDEFRoMS玎讧ULATEDBIOGASABSTRACTAsakindofrenewableandgreenenergy,BiogasCaneasetheglobalenergycr

3、isisbyreplacingthefossilfuels．Theoriginalbiogashasalowcalorificvalueanditsutilizationefficiencyislimited，becauseitcontainsalotofC02．Sothepurificationofbiogasisofgreatsignificancetoimproveitsutilizationefficiency．Inthispaper,twodifferentremovalmethodsofcarbondioxidefromsimulatedbi

4、ogaswerestudied，thatispressureswingadsorption(PSA)andchemicalabsorption．Adsorption／desorptionofC02fromsimulatedbiogasbyPSA(use5Amolecularsieveasadsorbent)wasstudiedinanadsorptioncolumn(C68×10×600)．Theeffectofadsorption／desorptionWasinvestigatedunderconditionsthatadsorptionpressur

5、erangeof0．2～O．8MPa，spacevelocityrangeof11．1"--44．2m3／(m2．h)，vacuumdesorptionpressure-0．02MPa．Removalofcarbondioxidefromsimulatedbiogasbychemicalabsorptionwithaqueouscontainingdiethanolamine(DEA)andinorganicbasewasstudiedinapackedcolumn(035×1000)．TheeffectofC02absorptionwasinvesti

6、gatedunderconditionsthatconcentrationofabsorptionsolutionrangeofO．5～3．0mol／L，solutioncomposition(totalconcentration2．0mol／L)，spacevelocity0．0236"--0．0393m3／(m2·s)，spraydensityrangeofO．849"-4．246m3／(m2．h)，temperaturerangeof10---40。C．TheresultsofPSAshowedthat，withtheincreaseofproce

7、ssingtime，CI-hcontentinoutputgasshowedariseIn'stfollowedbyadecline，andthereexistedahi曲estpoint．Withtheincreaseofadsorptionpressure，thehighestCH4contentinoutputgasandC02removalratealsoshowsucha浙江工业大学硕士学位论文III化学吸收法／变压吸附法脱除沼气中C02的实验研究trendasabove．Thebestadsorptionresultappearedatthe

8、pressureof0．4MPa．Whenthespacevelocityinc