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时间:2020-04-27
《中空纤维膜接触器脱碳和传质性能的数值研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第65卷第6期化工学报V_01.65NO.62014年6月CIESCJournalJune20l4~∥研u一一究一一论一中空纤维膜接触器脱碳和传质性能的数值研究一文一张力1,2,鞠顺祥1,2,闫云飞1,2,张智恩,(低品位能源利用技术及系统教育部重点实验室(重庆大学),重庆400030;重庆大学动力工程学院,重庆400030)摘要:中空纤维膜吸收烟气中CO2是一种清洁、高效、最具潜力的脱碳技术方法之一。本文建立了一个二维的中空纤维膜接触器平行逆流吸收混合气中CO2的非润湿模型。考虑轴向和径向扩散,模拟
2、了EEA、EDA和PZ3种吸收剂在不同操作条件下对CO2的脱除效果和传质性能。结果表明:脱碳性能从大到小为PZ>EDA>EEA;气相参数对脱碳和传质的影响比液相参数更显著;提高气体流速、CO浓度和气温,脱碳率均会下降;提高液速、吸收剂浓度和液温,脱碳率均增大,而传质速率只有在提高气温时会下降,其他参数的升高均会使其增大;应采用适当的液相参数,防止操作参数过高带来的不利影响。关键词:中空纤维膜接触器;二氧化碳;操作参数;模型;数值模拟DOI:10.3969~.issn.0438-1157.2014.06
3、.045中图分类号:TQ028.8文献标志码:A文章编号:0438—1157(2014)06—2285—09NumericalstudyonabsorptionofcarbondioxideandmasstransferperformanceinhollowfibermembranecontactorZHANGLi,JUShunxiang1,一,YANYunfei,ZHANGZhi’en,(IKeyLaboratoryofLow-gradeEnergyUtilizationTechnologiesan
4、dSystems(ChongqingUniversity),MinistryofEducation,Chongqing400030,China;CollegeofPowerEngineering,ChongqingUniversity,Chongqing400030,China)Abstract:Atypeofprocess,whichabsorbscarbondioxide(c02)fromfluegasinhollowfibermembranecontactor,hasbeenconsidered
5、asoneofclean,higheficientandthemostpromisingdecarburizationtechnologies.Atwo-dimensionalmathematicalmodelwasdevelopedforabsorptionofCO2fromparallelcountercurrentmixedgasbyhollowfibermembranecontactor.Byusingfiniteelementmethod,C02removal(decarburization
6、)andmasstransferperformanceofthreeabsorbentsEEA(ethyl—ethanolamine),EDA(ethylenediamine)andPZ(piperazine)weresimulatedatvariousoperationconditionsinwhichaxialandradialdiffusioninmembranecontactoraswellasdiffusioninfiberandmembraneporesandnon-wettingcond
7、itionwereconsidered.ThesimulationresultsshowthattheorderofdecarburizationperformanceisPZ>EDA>EEA.TheinfluenceofthegasphaseparametersonC02removalandmasstransferismoresignificantthanthatofliquidphaseparameters.Withincreaseofgasflowrate,C02concentration,an
8、dgastemperature,thedecarburizationeficiencydecreases.WhiletheC02removaleficiencygoesupwhenliquidflowrate,solventconcentration,andliquidtemperatureincrease.However,theCO2masstransferratespeedsupwithincreaseofallparametersexceptgas
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