烟气CO_(2)捕集塔内流动特性模拟与优化  

Simulation and Optimization of Flow Characteristics in Flue Gas CO_(2) Capture Tower

作　　者：吴其荣 陈斌 龚睿杰 王进 张寅 WU Qirong;CHEN Bin;GONG Ruijie;WANG Jin;ZHANG Yin(Technology Branch of Chongqing Yuanda Flue Gas Control Franchise Company Limited,Chongqing 401122,China;Chongqing Technology Innovation Center of Carbon Capture and Utilzation,Chongqing 400084,China;Shanghai Changxing Island Thermal Power Company Limited,Shanghai 201913,China)

机构地区：[1]重庆远达烟气治理特许经营有限公司科技分公司,401122 [2]重庆市碳捕集利用技术创新中心,重庆400084 [3]上海长兴岛热电有限责任公司,上海201913

出　　处：《化学反应工程与工艺》2024年第2期135-141,共7页Chemical Reaction Engineering and Technology

基　　金：重庆英才计划青年拔尖人才项目(CQYC2021059461);国家电力投资集团科技项目(2012BAJ21B07)。

摘　　要：洗涤和吸收系统是化学吸收法碳捕集技术核心之一,是实现烟气CO_(2)有效捕集的重要保障。为提高洗涤塔对SO_(2)、粉尘等污染物的去除效率,提升吸收塔对CO_(2)的吸收效率,降低洗涤塔和吸收塔运行阻力,应用数值模拟,建立了有机胺化学吸收法碳捕集洗涤塔和吸收塔流动模型。通过对塔内烟气流动特性进行分析, 优化了入口烟气角度、入塔烟气流速、入口烟道与填料间高度和塔内积液盘结构等。结果表明:当吸收塔入塔烟气倾角≥10°时,吸收塔内填料层前速度偏差和压力损失较0°的水平入口倾角均明显降低,入塔烟气倾角为15°时最佳;随着入塔烟气流速的增加,洗涤塔和吸收塔入口相对标准偏差和压力损失均随之增加。在塔入口增设双列叶片式气体分布器后,塔内第一层填料前截面烟气流速分布更均匀,但压力损失偏高,优化积液盘结构后,积液盘前截面烟气流速相对标准偏差和压力损失也显著降低,有效节约了系统能耗。The washing and absorption system is one of the core technologies of chemical absorption carbon capture,which is crucial for effectively capturing CO_(2) in flue gas.To improve the removal efficiency of pollutants such as SO_(2) and dust in scrubber,and enhance the absorption efficiency of CO_(2) in scrubber and absorber,and reduce the operation resistance of scrubber and absorber,the flow model of carbon capture scrubber and absorber by organic amine chemical absorption method was established by numerical simulation.The inlet flue gas angle,inlet flue gas velocity,the height between inlet flue and filling and the structure of liquid tray in tower were optimized by analyzing the flue gas flow characteristics in tower.The results showed that when the inclination angle of the absorber was greater than 10°,the velocity deviation and pressure loss in the absorber were significantly lower than those at the angle of 0°,and the optimal angle was at 15°.The relative standard deviation and pressure loss at the inlet of scrubber and absorber increased with the increase of inlet gas velocity.After adding a double-row vane gas distributor at the tower entrance,the flue gas velocity distribution in the front section of the first filling layer in the tower was more uniform,but the pressure loss was higher.After optimizing the structure of the liquid tray,the relative standard deviation and pressure loss of the flue gas velocity in the front section of the liquid tray were significantly reduced,thus effectively saving energy consumption.

关 键 词：碳捕集 化学吸收法 流动特性 模拟优化 

分 类 号：TQ052[化学工程] X701[环境科学与工程—环境工程]