EFFECT OF THE ADDITIVES ON THE DESULPHURIZATION RATE OF FLASH HYDRATED AND AGGLOMERATED CFB FLY ASH
CFB fly ash from separators was mixed with water or the mixture of water and additives under the temperature of 363K by use of a blender. Then, this compound of fly ash and water or additives was pumped into a CFB combustion chamber by a sludge pump. Because the temperature of flue gas was high in CFB, the fly ash was hydrated fast and agglomerated in the same time. Through this process, the size of agglomerating fly ash is larger than the original particle and the relative residence time of agglomerated fly ash in CFB becomes longer. Therefore, the rate of utility of calcium in fly ash improves and the content of carbon in fly ash decreases. This results in a low Ca/S and low operational cost for CFB boiler. The additive is one key factor, which affects the rate of desulfurization of agglomerated fly ash. Effect of different additives on rate of desulfurization is not same. Cement and limestone are beneficiated to sulfur removal of agglomerated fly ash, but sodium silicate does not devote to the rate of sulfur removal of agglomerated fly ash.
fly ash CFB hydration agglomeration rate of wear
D.X.Li H.L.Li M.Xu J.F.Lu Q.Liu J.S.Zhang G.X.Yue
College of Environmental Science and Engineering, Donghua University,2999 North Renmin Road, Songjia Department of Thermal Engineering, Tsinghua University, Beijing, 100084, China
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
1078-1081
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）