基于逾渗理论的CaO吸收CO2动力学模型研究

石灰石循环吸收技术被认为是一种高效、经济的减排烟气中CO2技术。但这种方法循环效率降低较快,吸收剂利用率也较低。为了对这一过程有很好的认识,改善吸收剂的利用率,针对颗粒典型气固反应模型的缺点,将逾渗理论应用于CaO与CO2反应模型中,对CaO颗粒吸收烟气中CO2的过程进行描述。实验数据与模型数据相结合,表明新的模型可以很好地对吸收过程进行描述,并得出:烟气中CO2体积分数对CaO转化率的影响主要是在反应初期的化学反应阶段;小粒径CaO颗粒在一定程度上可以提高CaO的钙转化率。这为实际过程提高循环吸收效率提供理论指导。

Dynamics Model of CaO Absorbing CO2 Based on Percolation Theory

In view of the shortcoming of each gas-solid pellet model,a percolation model was made to depict the process of CaO particle absorb CO2 in this paper.Using the data of experiment to validate the data of model,it was indicated that the model can depict the process of the pellet of CaO absorb CO2 better.It was concluded from experiment that the volume fraction of CO2 influenced the percent conversion of CaO in initial stages of chemical reaction and the small particle size of CaO could improve the percent conversion of CaO in certain degree.The conclusion offered reference to practical work.