This study addresses the energy-intensive challenge of small-scale biogas upgrading by optimizing a chemical absorption process employing methyl diethanolamine(MDEA).Focusing on a typical distributed application of 30...This study addresses the energy-intensive challenge of small-scale biogas upgrading by optimizing a chemical absorption process employing methyl diethanolamine(MDEA).Focusing on a typical distributed application of 300 Nm^(3)/d,we developed an integrated simulation-optimization framework using Aspen HYSYS 14.0 to systematically evaluate the effects of critical operating parameters—absorption pressure,MDEA concentration,flow rate,temperature,number of trays,and reboiler duty—on methane purity and energy consumption.The key finding is the identification of an optimal parameter set:absorption pressure of 1200 kPa,MDEA concentration of 20mol%,lean flow rate of 2.5 kmol/h,temperature of 298.15 K,20 absorber trays,10 regenerator trays,and a reboiler duty of 4 kW,which enabled the product gas to achieve a high CH4 concentration of 97mol%,compliant with pipeline standards.A detailed energy consumption analysis revealed that the reboiler is the most energy-intensive unit,accounting for 75.40%of the total 5.29 kW energy consumption,followed by the gas compressor(23.38%).The specific energy consumption for CH4 recovery and the Energy Consumption Index(ECI)were quantified at 0.8852 kWh/kg CH_(4)and 6.82,respectively.This work provides a validated optimization strategy and critical energy breakdown,offering practical guidance for enhancing the technical and economic viability of small-scale,centralized biogas purification systems.展开更多
利用Aspen Plus V14流程模拟软件,对炼厂气分馏工艺进行模拟,验证模拟流程的准确性;对丙烯精馏单元建立了常规单塔精馏、顺流双效精馏和逆流双效精馏模型,经过模拟对比,确定逆流双效精馏为最佳方案,其精丙烯产品纯度达到99.76%,冷凝器...利用Aspen Plus V14流程模拟软件,对炼厂气分馏工艺进行模拟,验证模拟流程的准确性;对丙烯精馏单元建立了常规单塔精馏、顺流双效精馏和逆流双效精馏模型,经过模拟对比,确定逆流双效精馏为最佳方案,其精丙烯产品纯度达到99.76%,冷凝器热负荷和再沸器热负荷分别比单塔精馏降低52.7%和53.4%。利用灵敏度分析工具,对逆流双效精馏进行了初步优化;在此基础上,采用正交试验进行进一步优化,得到逆流双效精馏的最优参数:低压塔塔顶采出量为62 kmol h,低压塔进料塔板编号为46(自上而下),高压塔进料塔板编号为42(自上而下),高压塔回流摩尔比为14。展开更多
基金funded by Shenzhen Science and Technology Program,grant number No.ZDSYS20230626091400001No.KCXST20221021111609024No.KCXFZ20240903093459001.
文摘This study addresses the energy-intensive challenge of small-scale biogas upgrading by optimizing a chemical absorption process employing methyl diethanolamine(MDEA).Focusing on a typical distributed application of 300 Nm^(3)/d,we developed an integrated simulation-optimization framework using Aspen HYSYS 14.0 to systematically evaluate the effects of critical operating parameters—absorption pressure,MDEA concentration,flow rate,temperature,number of trays,and reboiler duty—on methane purity and energy consumption.The key finding is the identification of an optimal parameter set:absorption pressure of 1200 kPa,MDEA concentration of 20mol%,lean flow rate of 2.5 kmol/h,temperature of 298.15 K,20 absorber trays,10 regenerator trays,and a reboiler duty of 4 kW,which enabled the product gas to achieve a high CH4 concentration of 97mol%,compliant with pipeline standards.A detailed energy consumption analysis revealed that the reboiler is the most energy-intensive unit,accounting for 75.40%of the total 5.29 kW energy consumption,followed by the gas compressor(23.38%).The specific energy consumption for CH4 recovery and the Energy Consumption Index(ECI)were quantified at 0.8852 kWh/kg CH_(4)and 6.82,respectively.This work provides a validated optimization strategy and critical energy breakdown,offering practical guidance for enhancing the technical and economic viability of small-scale,centralized biogas purification systems.
文摘利用Aspen Plus V14流程模拟软件,对炼厂气分馏工艺进行模拟,验证模拟流程的准确性;对丙烯精馏单元建立了常规单塔精馏、顺流双效精馏和逆流双效精馏模型,经过模拟对比,确定逆流双效精馏为最佳方案,其精丙烯产品纯度达到99.76%,冷凝器热负荷和再沸器热负荷分别比单塔精馏降低52.7%和53.4%。利用灵敏度分析工具,对逆流双效精馏进行了初步优化;在此基础上,采用正交试验进行进一步优化,得到逆流双效精馏的最优参数:低压塔塔顶采出量为62 kmol h,低压塔进料塔板编号为46(自上而下),高压塔进料塔板编号为42(自上而下),高压塔回流摩尔比为14。
