碳化液组成对溶析结晶过程的影响

Effect of carbonized ammonia constituent on the crystallization process

摘要:

为解决当前氨法脱碳技术中存在的再生能耗高、氨逃逸、反应后期吸收率低等弊端，提出一种溶析法强化低碳化度氨水结晶工艺. 低碳化度氨水结晶可以使吸收速率维持在较高水平，采用晶体产物进行热解再生，既可以实现再生能耗的降低，又可以解除再生能耗对于氨水浓度的限制，可以解决当前氨法脱碳技术中存在的问题. 采用半连续鼓泡反应系统进行基础研究，分析不同实验工况对于碳化液组成的影响，以及不同碳化液组成对溶析结晶过程的影响，考察试验工况对结晶收率的影响. 结果表明，不同试验工况下产生的碳化液对结晶收率有很大的影响. 吸收温度为20 ℃，气体流量为2 L/min，CO₂体积分数为28%以及氨水质量浓度为10%有利于结晶过程.

Abstract:

In response of the problems such as ammonia escape, high regenerated energy, low absorbed rate in the late stage which exists in the research of carbon capture by ammonia now, this paper presents a kind of reinforced crystallization technologies based on the way of antisolvent crystallization. Reinforcing the aqueous ammonia of low carbonized degree crystallization can make the average absorbed rate maintain at a high level and regeneration by desorbing crystal product can save the regeneration energy, what’s more, the ammonia of low concentration can be chosen as absorbent which can solve the ammonia escape problem at some extent. The bubbling reactor is adopt to do the fundamental research, the effect of different experimental condition on the constituent of carbonized ammonia and the effect of different carbonized ammonia constituents on the crystallization process are analyzed. The experimental conditions of absorption temperature of 20 ℃, flow rate of 2 L/min, CO₂ volume fraction of 28% and aqueous ammonia mass concentration of 10% benefit the crystallization process.