CO2 capture performance using limestone modified with propionate acid during calcium looping cycle
Limestone was modified with excessive propionate acid solution.The cyclic CO2 capture performance of the modified limestone during calcium looping cycle was investigated using a thermo-gravimetric analyzer (TGA) and a twin fixed-bed calcination/carbonation reactor system.The results obtained prove that the modified limestone can be an effective sorbent for CO2 capture at high temperature.The modified limestone exhibits obviously faster carbonation rate,and achieves higher carbonation conversion than the original one under the same reaction conditions.The optimum carbonation temperature for modified limestone is between 680℃ and 720℃.Higher calcination temperature can aggravate sintering of the sorbent during calcination periods.The modified limestone shows better anti-sintering properties than original one at high calcinations temperature.Longterm CO2 capture capacity of the sorbent is enhanced by modification using propionate acid,resulting in a carbonation conversion of 0.31 for modified limestone after 100 cycles,while the value for original limestone is only 0.08.The surface morphology of the modified limestone after the first calcination is much more porous and the pores are more connective than that of the original one.A much better pore structure is kept after 100 cycles for modified limestone.It indicates that modified limestone is much more sintering-resistant than original one during cyclic reactions.
calcium looping cycle limestone propionate acid modification CO2 capture
Sun Rongyue Li Yingjie Liu Hongling Wu Shuimu Lu Chunmei
School of Energy and Power Engineering,Shandong University,Jinan 250061,China
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
760-764
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）