In this study, the multi-staged membrane process of 100 Nm3/hr scale was studied under various operating conditions (pressure, temperature and membrane area) to find an optimal process condition for the recovery of high purity methane (>95 %) from an anaerobic digestion process. The permeance and se...
In this study, the multi-staged membrane process of 100 Nm3/hr scale was studied under various operating conditions (pressure, temperature and membrane area) to find an optimal process condition for the recovery of high purity methane (>95 %) from an anaerobic digestion process. The permeance and selectivity of pure gas under varying pressure and temperature were measured in lab-scale using commercially available polysulfone hollow fiber membranes. Under mixture gases, the change of methane purity and recovery were also investigated with different stage-cut.
Based on lab-scale experiments, 3-stage recirculation membrane processes were designed and demonstrated for the separation and purification of the real biogas. Tested on the 3-stage membrane process with operating pressure and temperature conditions, the methane purity, recovery were increased as the operating pressure was increased and the operating temperature was decreased. From these data, the operating condition of multi-stage membrane process was fixed at 8∼9 barg and 0∼5 ℃. To investigate the effect of membrane area ratio on 3-stage membrane process, the different membrane area ratio (1:1:1, 1:2:1, 1:3:1) were examined; total membranes area was fixed at 800∼840 m2. When 1,2-stage membrane area ratio was increased, the methane purity and the recovery ratio were increased from 97.8 % to 98.9 %, and the recycle ratio was increased from 62 % to 100 %. As the total membrane area was increased at different membrane area ratio, 1:1:1, 1:2:1 and 1:3:1, methane purity was increased 96.1∼98.4 %, 95.9∼98.9 %, 95.8∼99.3 % respectively, while recovery ratio and recycle ratio were decreased. As two conditions, the membrane area and membrane area ratio, were changed simultaneously, the recovery ratio was influenced by both parameters and the recycle ratio was influenced by the membrane area effectively.
From these result, we found that the operating pressure, temperature, membrane area and membrane area ratio significantly affect the performance of the membrane process. We demonstrated that the high purity methane (>95 %) could be obtained by using gas separation membrane process from biogas.
In this study, the multi-staged membrane process of 100 Nm3/hr scale was studied under various operating conditions (pressure, temperature and membrane area) to find an optimal process condition for the recovery of high purity methane (>95 %) from an anaerobic digestion process. The permeance and selectivity of pure gas under varying pressure and temperature were measured in lab-scale using commercially available polysulfone hollow fiber membranes. Under mixture gases, the change of methane purity and recovery were also investigated with different stage-cut.
Based on lab-scale experiments, 3-stage recirculation membrane processes were designed and demonstrated for the separation and purification of the real biogas. Tested on the 3-stage membrane process with operating pressure and temperature conditions, the methane purity, recovery were increased as the operating pressure was increased and the operating temperature was decreased. From these data, the operating condition of multi-stage membrane process was fixed at 8∼9 barg and 0∼5 ℃. To investigate the effect of membrane area ratio on 3-stage membrane process, the different membrane area ratio (1:1:1, 1:2:1, 1:3:1) were examined; total membranes area was fixed at 800∼840 m2. When 1,2-stage membrane area ratio was increased, the methane purity and the recovery ratio were increased from 97.8 % to 98.9 %, and the recycle ratio was increased from 62 % to 100 %. As the total membrane area was increased at different membrane area ratio, 1:1:1, 1:2:1 and 1:3:1, methane purity was increased 96.1∼98.4 %, 95.9∼98.9 %, 95.8∼99.3 % respectively, while recovery ratio and recycle ratio were decreased. As two conditions, the membrane area and membrane area ratio, were changed simultaneously, the recovery ratio was influenced by both parameters and the recycle ratio was influenced by the membrane area effectively.
From these result, we found that the operating pressure, temperature, membrane area and membrane area ratio significantly affect the performance of the membrane process. We demonstrated that the high purity methane (>95 %) could be obtained by using gas separation membrane process from biogas.
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