消除及回收烟气中SO_2的糠醛渣活性炭研究

Study of Furfural Residue Carbon for Eliminating and Recovering Sulphur Dioxide from Flue Gases.

利用糠醛渣废料研制成一种新型改质炭(简称渣炭),采用温度程序脱附(TPD),色谱质谱连用(GC-MS),比表面测定(BET),静态与动态吸附以及二氧化硫氧化反应等方法,对渣炭的物化性质进行表征,并与几种商品炭进行比较;考察其反应条件,表明该渣炭无需添加任何活性组分便具有良好的脱硫性能,适用于烟气脱硫制酸过程。认为渣炭上某些羟基及羰基表面基团是脱硫活性中心,丰富的中孔有利于反应扩散。在烟气量5000Nm^3/h的中试装置上,于空速500h^(-1)。入口烟温70℃以及二氧化硫浓度1500—2500ppm的条件下,对工业放大渣炭进行验证,连续累计操作6000多小时,二氧化硫消除率约70％及副产硫酸的浓度约30％,并且,该渣炭的成本可以比碘炭降低40％左右。

A new type of modified active carbon, furfural residue carbon was manufactured with residues in the production of furfural. Its physical and chemical properties were characterized with TPDE, GC-MS, BET, rteady and flowstate adsorption, oxidation of SO2, and compared with those ofother commercial active carbons. It was found thatthe furfural residue carbon possesses a better de-sulphurization property without the need of adding any active components, and is applicable to the process of desculphurization from flue gas to prepare sulphuric acid. It was supposed that the surface groups composed of hydroxyl and carbonyl are the active centers of SO2 uptake, and the abundant middle pores are favourable to the diffusion of reactants. The furfural residue carbon made oa an industrial scale was examined successfully on a pilot plant capable of treating 5000 Nm3/h flue gas from a coal-combustion power plant, at an inlet temperature of about 70℃ and 1500-2500 ppm of SO2 concentration of flue gas and with a space velocity of 500 h. Stability test was carried out for more fhan 6000 hours, and it was found that 'he conversion of SO2 reached about 70%, the concentration of by-product H2SO4 was about 30%wt and no apparent deactivation of the furfural residue carbon was observed. In addition, production cost of the furfural residue carbon is about 40% lower than the commericial active carbon containing iodine component.