摘要
针对低浓度CO_(2)烟气吸附捕集过程开发,在15%CO_(2)/85%N_(2)(体积分数)体系中,采用自制TCDS分子筛开展吸附工艺研究。利用固定床吸附装置考察了吸附工艺条件与CO_(2)穿透吸附量和选择性的关系,确定了吸附剂硅铝比2.0、吸附温度40℃、压力150 kPa、空速150 h^(-1)为最优CO_(2)吸附条件。通过测定TCDS吸附剂的吸附等温线和传质系数,确定TCDS分子筛在30℃、100 kPa下的CO_(2)吸附容量较高,可达5.2 mol/kg。进一步采用Aspen Adsorption软件建立固定床吸附穿透模型和两级真空变压吸附模型进行低浓度CO_(2)吸附捕集。模拟结果得到CO_(2)产品纯度95.6%,CO_(2)总收率91.2%,能耗为2.16 GJ/t CO_(2),为后续工程设计提供了可靠的理论依据。
In order to capture low-concentration CO_(2) in flue gas,the adsorption study is conducted by using self-made TCDS molecular sieve in a 15%CO_(2)/85%N2 system.The relationships between adsorption process conditions and CO_(2) breakthrough adsorption capacity as well as selectivity are investigated through using a fixed-bed adsorption device.The optimal adsorption conditions are determined as follows:the ratio of silicon to aluminum is 2.0 for the adsorbent,adsorption temperature is 40℃,pressure 150 kPa,and space velocity 150 h-1.Through measuring the adsorption isotherm and mass transfer coefficient of TCDS adsorbent,it is determined that TCDS molecular sieve shows a higher CO_(2) adsorption capacity at 30℃and 100 kPa,which can reach 5.2 mol/kg.Furthermore,by means of Aspen Adsorption software,the fixed bed adsorption breakthrough model and two-stage vacuum pressure swing adsorption model are established for capturing low-concentration CO_(2).The simulation results show that the purity of CO_(2) product is 95.6%,total CO_(2) yield is 91.2%,and the energy consumption is 2.16 GJ/t CO_(2),providing reliable theoretical basis for subsequent engineering design.
作者
陈自浩
张博宇
赵云
汲银平
孙富伟
李犇
CHEN Zi-hao;ZHANG Bo-yu;ZHAO Yun;JI Yin-ping;SUN Fu-wei;LI Ben(CNOOC Tianjin Chemical Research and Design Institute Co.,Ltd.,Tianjin 300131,China;China Kunlun Contracting&Engineering Corporation,Beijing 100037,China)
出处
《现代化工》
北大核心
2025年第9期196-202,共7页
Modern Chemical Industry
基金
中国海洋石油集团有限公司科技项目(KJGG-2022-12-CCUS-030700)。
关键词
吸附量
固定床
真空变压吸附
CO_(2)捕集
吸附剂
adsorption capacity
fixed bed
vacuum pressure swing adsorption
CO_(2)capture
adsorbent
