(68g) Performance Evaluation of Aqueous Ammonia Process for CO2 Capture

Recently, aqueous ammonia process has been studied to reduce the cost of CO2 capture from flue gas of coal-fired power plant. In addition to its low price, ammonia process has several advantages, such as large CO2 sorption capacity, fast sorption rate, low regeneration energy and temperature, no degradation of absorbent by acidic compounds in flue gas, and potential ability to capture acidic gases. However, aqueous ammonia process has inherent problems due to the high vapor pressure of ammonia. In this study, the performance of continuous CO2 separation process using aqueous ammonia was evaluated. The best ammonia concentration was selected. CO2 transfer capacity, which can be defined as grams of CO2 recovered per gram of aqueous ammonia, and CO2 recovery were obtained in reasonable range of gas and liquid flow rates. In addition, the concentration changes of carbon containing species between absorption and regeneration were analyzed.