湍球塔捕集烟气中低浓度二氧化碳特性  

Character of turbulent contact absorber in treating low concentration CO_2 flue gas

作　　者：周向[1,2] LEI Cheng Tim C. Keener 宋存义[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]辛辛那提大学,美国俄亥俄45220

出　　处：《化工学报》2011年第11期3269-3275,共7页CIESC Journal

摘　　要：引言全球温度逐步上升已经是个不容否认的事实[1],政府间气候变化专门委员会(IPCC,intergovernmental panel on climate change)《2007年气候变化报告》[2]指出温室效应主要是人类活动造成,而且化石燃料燃烧排放的CO2对温室效应贡献率达到56.5%。CO2 concentration in the atmosphere is critical for global warming. The emission from power station is one of the biggest CO2 point sources in the world. In all kinds of CO2 capture methods, the post- combustion adsorption is the most potential one for commercial application in existed power plants. In contrast with packing tower which is investigated by many researchers, the TCA （turbulent contact absorber） can employ higher gas velocity to reduce system＇s occupancy area. In order to better understand TCA capturing CO2 system, a series of experiments were conducted under different operating conditions using pure water and different concentration NaOH solution at low CO2 concentration （7%-14%） flue gas. The TCA column has 0.13 m diameter and 1.5 m height, and is operated at counter-current mode and flue gas was introduced from a furnace＇s flue gas system. The effects of the gas distributor, static packing uniformity, inlet CO2 concentration, gas residence time, L/G （liquid-gas ratio）, and concentration of solvent were also examined. And the production of the overall mass transfer coefficient and the interfacial area in the unit volume Kga were calculated for NaOH solution. Higher heights of Raschig rings as gas distributor as well as higher residence time and L/G, higher CO2 removal efficiency, whereas uniformity of static packing （10 mm diameter polypropylene ball） as well as increase of inlet CO2 concentration has a little effect on removal efficiency at sufficient turbulence condition. The gas film resistance is not significant for H20-CO2 system in TCA, but gas holdup decreases with increase of L/G. Reactions between NaOH and CO2 can reduce liquid film resistance and increase the removal efficiency. 35.3%-- 66.7% removal efficiencies and （1.3×10 7） （1.8×10-7） kmol. m-3 . s -1 .Pa 1 Kga are achieved with 1 tool . L-1 NaOH and L/G 12 24 L .m-3. The gas film resistance is not important when NaOH concentration〈1 mol , L-1, but when NaOH concentration〉1 mol . L-1, it becomes signi

关 键 词：湍球塔 低浓度CO2 CO2捕集 液气比 

分 类 号：TQ[化学工程]