CAJ | 학술논문

针对目前氨法脱除二氧化碳研究中存在的问题，该文提出一种低浓度氨水强化结晶低能耗捕集 CO2的工艺，采用新型的氨水乙醇混合吸收液，利用半连续鼓泡反应系统考察停留时间对结晶的影响。发现随着停留时间的延长，晶体产物的粒径分布逐渐改善，平均粒径亦在前30 min 保持一定增长速率，晶体形貌趋于完整，且结块问题也可以得到一定程度的解决。综合考虑，该实验条件下较适宜的停留时间为30~40 min；同时对结晶动力学进行初步探索，确定了该实验中晶体的生长机制为粒度无关生长，并给出了晶体成核速率与生长速率的生长动力学模型为B0=4.172×106G1.090。为接下来新工艺的进一步研究提供基础数据和参考，并对实际工艺的发展和改善具有借鉴意义。
침대목전안법탈제이양화탄연구중존재적문제，해문제출일충저농도안수강화결정저능모포집 CO2적공예，채용신형적안수을순혼합흡수액，이용반련속고포반응계통고찰정류시간대결정적영향。발현수착정류시간적연장，정체산물적립경분포축점개선，평균립경역재전30 min 보지일정증장속솔，정체형모추우완정，차결괴문제야가이득도일정정도적해결。종합고필，해실험조건하교괄의적정류시간위30~40 min；동시대결정동역학진행초보탐색，학정료해실험중정체적생장궤제위립도무관생장，병급출료정체성핵속솔여생장속솔적생장동역학모형위B0=4.172×106G1.090。위접하래신공예적진일보연구제공기출수거화삼고，병대실제공예적발전화개선구유차감의의。
In response of problems existing in current research of carbon capture by ammonia, this paper presents a process of carbon capture by ammonia of low concentration with reinforced crystallization and lower energy consumption, using a new kind of absorbent which is the mixture of aqueous ammonia and ethanol. The effect of residual time on the crystallization was studied through a semi-continuous bubbling reaction system. It is found that as the extension of the residence time, the size distribution of the crystal product improves gradually, the average particle size grows with a certain rate in the first 30 min, crystal morphology tends to finish, and caking problem can be solved to some extent. All things considered, the relatively appropriate residence time is 30~40 min in this experimental condition. The preliminary exploration of the crystallization kinetics was also conducted. The crystal growth mechanism in this experiment was determined to be size independent growth, and the growth kinetics model of the crystal nucleation rate and growth rate was given as follows: B0=4.172 × 106G1.090. This can provide basic data and reference for the further study of this new technology and has important significance for the development and improvement of the actual technology.