新型氨法捕碳体系中介稳区宽度的调控机制  

Regulation mechanism of intermediate stable zone width of new ammonia carbon capture system

作　　者：张宇[1] 张哲成 高建民[1] 李鋆芝 谢敏 杜谦[1] 秦裕琨[1] ZHANG Yu;ZHANG Zhecheng;GAO Jianmin;LI Yunzhi;XIE Min;DU Qian;QIN Yukun(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Harbin Electric Company Limited,Harbin 150028,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001 [2]哈尔滨电气股份有限公司哈电研究院,哈尔滨150028

出　　处：《哈尔滨工业大学学报》2023年第1期19-23,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(52006047)。

摘　　要：碳酸氢铵的介稳区宽度是影响其结晶过程的重要因素,为进一步解析其具体调控机制,运用动态法探究温度、磁场、搅拌速率及溶析剂滴定速率等关键参数对碳酸氢铵介稳区的影响机制,并对操作条件进行优化调控。结果表明:随着温度升高和乙醇摩尔分数增大,碳酸氢铵的成核能垒降低,介稳区宽度呈变窄趋势;当温度相同时,在磁场条件下,超溶解度曲线呈下降趋势,介稳区变窄,但是随着乙醇摩尔分数的增大,其下降趋势减弱;搅拌速率从200 r/min增加到600 r/min的过程中,介稳区宽度先下降后上升;介稳区宽度随着溶析剂滴加速率的增加而增加,滴加速率提高到8 mL/min后,介稳区变化趋于平缓。升高温度,增加磁场,一定范围内增加搅拌速率,取适当滴加速率均能促进结晶过程。本研究可为氨法结晶捕碳工艺提供数据支持及优化策略。The metastable zone width of ammonium bicarbonate is an important factor affecting its crystallization process.To further analyze its specific regulation mechanism,this paper uses dynamic method to explore the influence mechanism of key parameters such as temperature,magnetic field,stirring rate and solvent titration rate on the metastable zone of ammonium bicarbonate and optimize the operation conditions.The results showed that with the increase of temperature,Molar fraction of ethanol increased,the nuclear energy barrier of ammonium bicarbonate decreased,and the width of metastable zone became narrower.At the same temperature,under the condition of magnetic field,the super solubility curve showed a downward trend and the metastable zone narrowed,but the trend weakened with the increase of Molar fraction of ethanol.When the stirring rate increased from 200 r/min to 600 r/min,the metastable zone width decreased first and then increased.The width of metastable zone increased with the increase of the droplet acceleration rate of solvent.When the droplet acceleration rate increased to 8 mL/min,the change of metastable zone tended to be flat.Increasing the temperature,increasing the magnetic field,increasing the stirring rate within a certain range,and taking the appropriate drop acceleration rate can promote the crystallization process.

关 键 词：氨法捕碳 溶析法 介稳区 强化结晶 碳酸氢铵 

分 类 号：TU398[建筑科学—结构工程]