caa a22 4500 606170537 CHVBK 20210128100718.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10098-014-0787-7 doi (NATIONALLICENCE)springer-10.1007/s10098-014-0787-7 Modeling and simulation of high pressure water scrubbing technology applied for biogas upgrading [Elektronische Daten] [Petronela Cozma, Walter Wukovits, Ioan Mămăligă, Anton Friedl, Maria Gavrilescu] Depending on the end of use, the quality of biogas must be upgraded in order to utilize the maximum amount of energy necessary for proper applications. Upgrading biogas refers to the increase of methane concentration in product gas by removal of CO2, which increases its heating power. Several treatment technologies are available for biogas upgrading: high pressure water scrubbing (HPWS), pressure swing adsorption, membrane separation, chemical absorption, and gas permeation. Water absorption based on the physical effect of dissolving gases in liquids (HPWS) is a well-known technology and the most effective upgrading process, since provides a simultaneous removal of CO2 and H2S. This could ensure an increasing methane concentration and energy content per unit volume of biogas. In spite of this, few studies are published on biogas upgrading using pressurized water technology. In order to elucidate the performance of HPWS technology at industrial scale with the possibility of water regeneration and recirculation, effects of different operating parameters on the removal of undesired components from biogas were examined, based on modeling and simulation tools. For simulation, the commercial software tool Aspen Plus was applied. Equilibrium model was applied for simulating the absorption process. The simulation results were validated with experimental data from the literature. The results are summarized in terms of system efficiency, expressed as CH4 enrichment, methane loss, and CO2 removal. Finally, new data which can be further applied for scale-up calculations and techno-economic analysis of the HPWS process are provided. Springer-Verlag Berlin Heidelberg, 2014 Biogas upgrading nationallicence CO2 removal efficiency nationallicence Gas absorption nationallicence Gas solubility nationallicence High pressure water scrubbing nationallicence Process simulation nationallicence AFR : Air flow rate, Nm3/h nationallicence CH4Recirc : CH4 recirculated from flash back to crude biogas (%) nationallicence CO2Recirc : CO2 recirculated from flash back to crude biogas (%) nationallicence CO2 RE : CO2 removal efficiency (%) nationallicence FWFR : Fresh water flow rate (m3/h) nationallicence GFR : Plant capacity/gas flow rate (Nm3/h) nationallicence G : Total gas flow rate (Nm3/h) nationallicence HPWS : Water scrubbing technology nationallicence L : Total liquid flow rate (m3/h) nationallicence M% : Methane losses (%) nationallicence P flash : Pressure in flash (bar) nationallicence P stripper : Pressure in stripper (desorber) column (bar) nationallicence P absorber : Pressure in absorber column (bar) nationallicence PG : Product gas which is equivalent to upgraded biogas nationallicence SG : Off gas from stripper nationallicence T absorber : Temperature in absorber column (°C) nationallicence T stripper : Temperature in stripper (desorber) column (°C) nationallicence V WFR/ V GFR : Volumetric water flow rate to gas flow rate ratio (vol-based) nationallicence V FWFR/ V GFR : Volumetric fresh water flow rate to gas flow rate ratio (vol-based) nationallicence V WFR/ V WPA : Volumetric water flow rate to water pump-around flow rate ratio (vol-based) nationallicence V WPA/ V GFR : Volumetric water pump-around flow rate to gas flow rate ratio (vol-based) nationallicence V AFR/ V GFR : Volumetric air flow rate to gas flow rate ratio (vol-based) nationallicence $$ {\text{X}}_{{{\text{CO}}_{ 2} ,p = 10}} $$ X CO 2 , p = 10 : Concentration of CO2 in liquid phase at the equilibrium pressure of 10bar nationallicence $$ {\text{X}}_{{{\text{CO}}_{ 2} ,p = 3}} $$ X CO 2 , p = 3 : Concentration of CO2 in liquid phase at the equilibrium pressure of 10bar nationallicence YH2S,PG : H2S content in product gas (vol%) nationallicence YCH4,PG : CH4 content in product gas (vol%) nationallicence YCH4,SG : CH4 content in off gas (vol%) nationallicence WFR : Make-up water (% evaporated water per hour of WPA) (m3/h) nationallicence WPA : Water pump-around flow rate (amount of recirculated water) (m3/h) $$ {\text{CH}}_{4} \ nationallicence \text{recirculated}}\,(\% ) = \frac{{V{}_{{{\text{CH}}{}_{{_{4} }}{\text{REC}}}}}}{{V_{{{\text{CH}}{}_{4}{\text{RICH - SOL}}}} }} \times 100 nationallicence quad {\text{CO}}_{2} \ nationallicence \text{recirculated}}\,(\% ) = \frac{{V{}_{{{\text{CO}}{}_{{_{2} }}{\text{REC}}}}}}{{V_{{{\text{CO}}{}_{2}{\text{RICH - SOL}}}} }} \times 100, $$ CH 4 recirculated ( % ) = V CH 4 REC V CH 4 RICH - SOL × 100 nationallicence CO 2 recirculated ( % ) = V CO 2 REC V CO 2 RICH - SOL × 100 , where $$ V_{{{\text{CH}}_{ 4} {\text{REC}}}} ,V_{{{\text{CO}}_{2} {\text{REC}}}} $$ V CH 4 REC , V CO 2 REC —CH4 and CO2mol flow rate (kmol/h) at the top exit of flash (GAS-REC stream nationallicence the stream from flash recirculated back to absorber) nationallicence $$ V_{{{\text{CH}}_{4} {\text{RICH - SOL}}}} ,\ nationallicence _{{{\text{CO}}_{2} {\text{REC}}}} $$ V CH 4 RICH - SOL , V CO 2 REC nationallicence Cozma Petronela Department of Environmental Engineering and Management, "Gheorghe Asachi” Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Street, 700050, Iasi, Romania aut Wukovits Walter Institute of Chemical Engineering, Vienna University of Technology, Getreidemarkt 9/166, 1060, Vienna, Austria aut Mămăligă Ioan Department of Chemical Engineering, "Gheorghe Asachi” Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Street, 700050, Iasi, Romania aut Friedl Anton Institute of Chemical Engineering, Vienna University of Technology, Getreidemarkt 9/166, 1060, Vienna, Austria aut Gavrilescu Maria Department of Environmental Engineering and Management, "Gheorghe Asachi” Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Street, 700050, Iasi, Romania aut Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/2(2015-02-01), 373-391 1618-954X 17:2<373 2015 17 10098 https://doi.org/10.1007/s10098-014-0787-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10098-014-0787-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cozma Petronela Department of Environmental Engineering and Management, "Gheorghe Asachi” Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Street, 700050, Iasi, Romania aut NATIONALLICENCE 700 1- Wukovits Walter Institute of Chemical Engineering, Vienna University of Technology, Getreidemarkt 9/166, 1060, Vienna, Austria aut NATIONALLICENCE 700 1- Mămăligă Ioan Department of Chemical Engineering, "Gheorghe Asachi” Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Street, 700050, Iasi, Romania aut NATIONALLICENCE 700 1- Friedl Anton Institute of Chemical Engineering, Vienna University of Technology, Getreidemarkt 9/166, 1060, Vienna, Austria aut NATIONALLICENCE 700 1- Gavrilescu Maria Department of Environmental Engineering and Management, "Gheorghe Asachi” Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Street, 700050, Iasi, Romania aut NATIONALLICENCE 773 0- Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/2(2015-02-01), 373-391 1618-954X 17:2<373 2015 17 10098