13X沸石分子筛对低浓度CO_(2)动态吸附

Dynamic adsorption of low concentration CO_(2) over 13X zeolite

目前对于吸附分离技术应用于高压、低浓度CO_(2)脱除的研究还较少,在进行相应吸附脱碳工艺设计时也缺少相关的参考数据。为探究13X沸石分子筛对低浓度CO_(2)的动态吸附性能,本文利用动态吸附实验的方法,探究不同条件下低浓度(摩尔分数3%)CO_(2)气体在13X分子筛上的动态吸附性能,得到不同压力、温度、气体流量、填料高度及分子筛规格(尺寸、形状)等因素影响下的13X分子筛对于CO_(2)气体的动态吸附规律及相应的性能指标参数。结果表明:随着吸附压力的升高,13X分子筛的CO_(2)吸附量增加但增量逐渐减小;降低吸附温度、减小气体流量和增加填料高度均有利于增强13X分子筛的动态CO_(2)吸附性能,提高吸附脱碳效果,其中温度及填料高度的变化对于CO_(2)吸附的影响程度最大;实验还发现小尺寸及条状13X分子筛的动态吸附脱碳性能优于其他规格,并根据其特定条件下的出口CO_(2)浓度为50mL/m^(3)时的CO_(2)吸附量指标,给出吸附剂用量与液化天然气(LNG)脱碳工艺处理量的关系系数。

At present,there are insufficient studies on the application of adsorption to remove highpressure and low concentration CO_(2),and reference data for the design of the decarbonization process are not readily available.In this paper,dynamic adsorption experiments of low concentration(3%)CO_(2) on 13X zeolite were performed.The influence of different pressure,temperature,gas flow,filler height and molecular sieve specifications(size,shape)on the dynamic adsorption operation parameters were explored.The result showed,with the increase of adsorption pressure,the CO_(2) adsorption capacity of 13X zeolite increased but with decreasing pace.Decreasing the adsorption temperature,reducing gas flow and increasing the height of packing were all conducive to enhance the dynamic adsorption performance of 13X zeolite and improve the adsorption decarburization performance,and temperature and filler height have greater impact.The experiment also found that the dynamic adsorption and decarburization performance of the small strip 13X zeolite was better than the other ones.Based on the CO_(2) adsorption capacity when the outlet CO_(2) concentration was 50mL/m^(3) under specific conditions,the coefficient between the amount of adsorbent required and the treatment capacity of liquified natural gas(LNG)decarbonization was given.