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3.3.2.1. Absorber pressure. The amount of gas dissolved in the ILs increases with increasing absorber pressure and then influences the absorption capacity and selectivity. As shown in Fig. 12(a), with increasing pressure from 6 to 8 bar, the yield of product gas (YCH4 ) and the CO2 removal efficiency (RCO2 ) increase rapidly to 0.97 and 0.96, respectively, the CH4 loss (LCH4) decreases rapidly from 0.018 to 0.012. With further increasing pressure from 8 to 10 bar, YCH4 and RCO2 keep increasing but the increase rate is very slow, and LCH4 is almost a constant with a value of 0.012. When the absorber pressures increase from 6 to 10 bar, as shown in Fig. 12(b), in order to reach the upgrading efficiency (YCH4 = 0.97), the amount of recirculated solvent decreases from 28.7 to 21.3 t/h. The power consumptions of biogas compressors increase with increasing pressure, and the total power require- ments increase from 34.4 to 49.1 kw/h. 3.3.2.2. Pressure in Flash-1. In order to decrease LCH4 , the gas is recirculated after releasing from Flash-1. The pressure change in Flash-1 also affects YCH4 and RCO2 . As shown in Fig. 13(a), when the pressure of Flash-1 varies from 1 to 3 bar, both YCH4 and RCO2 increase rapidly to 0.97 and 0.96, respectively. With the further increase from 3 to 5bar, YCH4 and RCO2 keep almost constants. Meanwhile, LCH4 increases from 0.001 to 0.012 when the pressure of Flash-1 varies from 1 to 3bar. When the pressure further Y. Xie et al. / Applied Energy 175 (2016) 69–81 77 Fig. 11. The effects of density and viscosity of IL on the diameter of absorber and pressure drop. Fig. 12. Influence of pressure in absorber on (a) CH4 yield (YCH ), CO2 removal efficiency (RCO ) and CH4 loss ratio (LCH ). (b) Recirculated solvent and energy consumption. 424 Fig. 13. Influence of pressure in Flash-1 on (a) CH4 yield (YCH ), CO2 removal efficiency (RCO ) and CH4 loss ratio (LCH ). (b) Recirculated solvent and energy consumption. 424PDF Image | CO2 Separation with Ionic Liquids
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