Research On The Macroscopic Law Of CO₂ Capture By Ammonia Method And The Strengthening Effect Of High Gravity Field

CO₂ emission reduction is imminent. Many researchers are studying on CCS technology which is high performance, low cost and environmentally friendly. At present, kinds of wet flue gas decarburization techniques are widely used, such as MEA method. Through the operation of demonstration project, MEA method has some untoward effect to the power plant efficiency, and economy. Compare with MEA method, ammonia has following advantages: higher capability of absorbing, weaker corrosive, lower regeneration of energy consumption and can be realized combined removal of flue gas pollutants. Therefore, ammonia method becomes more and more important.In order to study the rule of ammonia absorbing CO₂ and the absorptive capacity, firstly, the process which ammonia as solution absorbs CO₂ until the solution loss the absorptive capacity in the semi-batch reactor was studied. In these experiments, removal of absorbent, absorption rate, variation of pH values efficiency, C loading, ammonia losing and the productions are included. Then, these rules are analyzed, including CO₂ removal efficiency varies with time in different concentration of ammonia, the CO₂ absorption rates varies with time in different concentration of ammonia, the relation of solution's failure time during the different concentration of ammonia, the solution's pH value varies with time in different concentration of ammonia, C loading in solution varies with time in different concentration of ammonia, and the quality of condensation products varies with time in different concentration of ammonia. These varies are explained by gas-liquid reaction theory. And raised on the best values of ammonia concentration and pH in semi-batch reactor.Secondly, the process which ammonia as solution absorbs CO₂ in the high gravity reactor is studied. In these experiments, the changes which are led to the high gravity reactor are found. Then, these rules are analyzed, such as these parameters which include removal of absorbent, absorption rate, C loading etc. varies with time in different high gravity factor. These varies are explained by the strengthening effect about gas-liquid reaction. And raised on the best values of high gravity factor and the solution's condition which fits for using high gravity reactor. Application of high gravity reactor is the innovation points in this paper, and the process of ammonia method is verified by high gravity experiment. The high gravity reactor has a strengthening effect, because it can enhance the mass transfer between gas and liquid. This result can provides a good foundation for an further study on ammonia method.