The enrichment of low concentration coalbed methane using adsorption process with activated carbon adsorbent was studied in this work.Adsorption isotherms of methane,nitrogen and carbon dioxide on activated carbon wer...The enrichment of low concentration coalbed methane using adsorption process with activated carbon adsorbent was studied in this work.Adsorption isotherms of methane,nitrogen and carbon dioxide on activated carbon were measured by volumetric method,meanwhile a series of breakthrough tests with single component,binary components and three components feed mixture has been performed for exploring dynamic adsorption behaviors.Moreover,a rigorous mathematical model of adsorption bed containing mass,energy,and momentum conservation equation as well as dualsite Langmuir model with the Linear driving force model for gassolid phase mass transfer has been proposed for numerical modeling and simulation of fixed bed breakthrough process and vacuum pressure swing adsorption process.Furthermore,the lumped mass transfer coefficient of methane,nitrogen and carbon dioxide on activated carbon adsorbent has been determined to be 0.3 s^(-1),1.0 s^(-1) and 0.06 s^(-1) by fitting the breakthrough curves using numerical calculation.Additionally,a six bed VPSA process with twelve step cycle sequence has been proposed and investigated for low concentration coalbed methane enrichment.Results demonstrated that the methane molar fraction in feed mixture ranged from 10%to 50%could be enriched to 32.15%to 88.75%methane in heavy product gas with a methane recovery higher than 83%under the adsorption pressure of 3 bar(1 bar=105 Pa)and desorption pressure of 0.1 bar.Energy consumption of this VPSA process was varied from 0.165 k·W·h·m^(-3) CH_(4)to 0.649 k·W·h·m^(-3) CH_(4).Finally,a dualstage VPSA process has been successfully developed to upgrade a low concentration coalbed methane containing 20%methane to a target product gas with methane purity higher than 90%,meanwhile the total methane recovery was up to 98.71%with a total energy consumption of 0.504 k·W·h·m^(-3)CH_(4).展开更多
介绍了VPSA(Verification Process Swing Adsorption,真空变压吸附)工艺和该工艺真空解吸用双吸高效离心风机研制难点。利用专业的气动软件和转子动力学理论,研发出满足VPSA工艺真空解吸要求的双吸高效离心风机,并成功应用于项目,此为...介绍了VPSA(Verification Process Swing Adsorption,真空变压吸附)工艺和该工艺真空解吸用双吸高效离心风机研制难点。利用专业的气动软件和转子动力学理论,研发出满足VPSA工艺真空解吸要求的双吸高效离心风机,并成功应用于项目,此为国内首台套应用于真空解吸系统的双吸离心风机,填补了国内空白。展开更多
Cu（I）Y adsorbent was prepared by reduction of Cu（II）Y which was prepared by ion exchange between the NaY zeolite and a solution of Cu（II） chloride. The dynamic adsorption capacity of Cu（1）Y for CO was calculat...Cu（I）Y adsorbent was prepared by reduction of Cu（II）Y which was prepared by ion exchange between the NaY zeolite and a solution of Cu（II） chloride. The dynamic adsorption capacity of Cu（1）Y for CO was calculated by adsorption breakthrough curve measured on a fixed bed at 30~C and 0.006MPa （g） of CO partial pressure. The calculated CO adsorption capacity was 2.14 mmol/g, 37.5 times as much as that of NaY zeolite. The adsorption breakthrough curve experiment was also simulated with Aspen Adsorption software and the results were approxi- mately consistent with experimental results. Then a five- bed VPSA process for separating CO from syngas on this adsorbent was dynamically simulated with Aspen Adsorp- tion software with the adsorption pressure of 0.68 MPa （g） and the desorption pressure of -0.075MPa （g）. The results showed that CO was enriched from 32.3% to 95.16%-98.12%, and its recovery was 88.47%-99.44%.展开更多
文摘The enrichment of low concentration coalbed methane using adsorption process with activated carbon adsorbent was studied in this work.Adsorption isotherms of methane,nitrogen and carbon dioxide on activated carbon were measured by volumetric method,meanwhile a series of breakthrough tests with single component,binary components and three components feed mixture has been performed for exploring dynamic adsorption behaviors.Moreover,a rigorous mathematical model of adsorption bed containing mass,energy,and momentum conservation equation as well as dualsite Langmuir model with the Linear driving force model for gassolid phase mass transfer has been proposed for numerical modeling and simulation of fixed bed breakthrough process and vacuum pressure swing adsorption process.Furthermore,the lumped mass transfer coefficient of methane,nitrogen and carbon dioxide on activated carbon adsorbent has been determined to be 0.3 s^(-1),1.0 s^(-1) and 0.06 s^(-1) by fitting the breakthrough curves using numerical calculation.Additionally,a six bed VPSA process with twelve step cycle sequence has been proposed and investigated for low concentration coalbed methane enrichment.Results demonstrated that the methane molar fraction in feed mixture ranged from 10%to 50%could be enriched to 32.15%to 88.75%methane in heavy product gas with a methane recovery higher than 83%under the adsorption pressure of 3 bar(1 bar=105 Pa)and desorption pressure of 0.1 bar.Energy consumption of this VPSA process was varied from 0.165 k·W·h·m^(-3) CH_(4)to 0.649 k·W·h·m^(-3) CH_(4).Finally,a dualstage VPSA process has been successfully developed to upgrade a low concentration coalbed methane containing 20%methane to a target product gas with methane purity higher than 90%,meanwhile the total methane recovery was up to 98.71%with a total energy consumption of 0.504 k·W·h·m^(-3)CH_(4).
文摘介绍了VPSA(Verification Process Swing Adsorption,真空变压吸附)工艺和该工艺真空解吸用双吸高效离心风机研制难点。利用专业的气动软件和转子动力学理论,研发出满足VPSA工艺真空解吸要求的双吸高效离心风机,并成功应用于项目,此为国内首台套应用于真空解吸系统的双吸离心风机,填补了国内空白。
文摘Cu（I）Y adsorbent was prepared by reduction of Cu（II）Y which was prepared by ion exchange between the NaY zeolite and a solution of Cu（II） chloride. The dynamic adsorption capacity of Cu（1）Y for CO was calculated by adsorption breakthrough curve measured on a fixed bed at 30~C and 0.006MPa （g） of CO partial pressure. The calculated CO adsorption capacity was 2.14 mmol/g, 37.5 times as much as that of NaY zeolite. The adsorption breakthrough curve experiment was also simulated with Aspen Adsorption software and the results were approxi- mately consistent with experimental results. Then a five- bed VPSA process for separating CO from syngas on this adsorbent was dynamically simulated with Aspen Adsorp- tion software with the adsorption pressure of 0.68 MPa （g） and the desorption pressure of -0.075MPa （g）. The results showed that CO was enriched from 32.3% to 95.16%-98.12%, and its recovery was 88.47%-99.44%.
