Different VSA （Vacuum Swing Adsorption） cycles and process schemes have been evaluated to find suitable process configurations for effectively separating C02 from flue gases from different industrial sectors. The cy...Different VSA （Vacuum Swing Adsorption） cycles and process schemes have been evaluated to find suitable process configurations for effectively separating C02 from flue gases from different industrial sectors. The cycles were studied using an adsorption simulator developed in our research group, which has been suc- cessfully used to predict experimental results over severa~ years. Commercial zeolite APGIlI and granular ac- tivated carbon were used as the adsorbents. Three-bed VSA cycles with- and without-product purge and 2- stage VSA systems have been investigated. It was found that for a feed gas containing 15% CO2 （representing flue gas from power plants）, high CO2 purities and recoveries could be obtained using a three-bed zeolite APGII1 VSA unit for one stage capture, but with more stringent conditions such as deeper vacuum pressures of 1-3 kPa. 2-stage VSA process operated in series allowed us to use simple process steps and operate at more realistic vacuum pressures. With a vacuum pressure of 10 kPa, final C02 purity of 95.3% with a recov- ery of 98.2% were obtained at specific power consumption of 0.55 MJ. （kg CO2） 1 from feed gas containing 15% C02. These numbers compare very well with those obtained from a single stage process operating at I kPa vacuum pressure. The feed CO2 concentration was very influential in determining the desorption pressure necessary to achieve high separation efficiency. For feed gases containing 〉30% CO2, a singlestage VSA capture process operating at moderate vacuum pressure and without a product purge, can achieve very high product purities and recoveries.展开更多
基金Supported by the Corporate Research Centre for Greenhouse Gas Technology Foundation in Australiathe National Natural Science Foundation of China(51074205)
文摘Different VSA （Vacuum Swing Adsorption） cycles and process schemes have been evaluated to find suitable process configurations for effectively separating C02 from flue gases from different industrial sectors. The cycles were studied using an adsorption simulator developed in our research group, which has been suc- cessfully used to predict experimental results over severa~ years. Commercial zeolite APGIlI and granular ac- tivated carbon were used as the adsorbents. Three-bed VSA cycles with- and without-product purge and 2- stage VSA systems have been investigated. It was found that for a feed gas containing 15% CO2 （representing flue gas from power plants）, high CO2 purities and recoveries could be obtained using a three-bed zeolite APGII1 VSA unit for one stage capture, but with more stringent conditions such as deeper vacuum pressures of 1-3 kPa. 2-stage VSA process operated in series allowed us to use simple process steps and operate at more realistic vacuum pressures. With a vacuum pressure of 10 kPa, final C02 purity of 95.3% with a recov- ery of 98.2% were obtained at specific power consumption of 0.55 MJ. （kg CO2） 1 from feed gas containing 15% C02. These numbers compare very well with those obtained from a single stage process operating at I kPa vacuum pressure. The feed CO2 concentration was very influential in determining the desorption pressure necessary to achieve high separation efficiency. For feed gases containing 〉30% CO2, a singlestage VSA capture process operating at moderate vacuum pressure and without a product purge, can achieve very high product purities and recoveries.
