烟气脱硫循环流化床内的温度分布与干燥特性

Temperature Distribution and Drying Characteristics in a Flue Gas Desulfurization-based Circulating Fluidized Bed

分析了烟气循环流化床内的绝热饱和温度,设计了烟气脱硫循环流化床内温度测量装置,在烟气脱硫中试试验台上用该装置测得了床内烟气温度分布和湿球温度分布.试验结果表明,在烟气循环流化床中,在喷入增湿水后,存在烟气温度逐渐降低和增湿水温逐渐升高两个不同的温度场.烟气温度经过快速降温及缓慢降温两个阶段;而增湿水温度快速升高并蒸发,烟气温度与增湿水温度在液滴干燥完毕时趋于一致.试验结果还表明,烟气循环流化床内雾化液滴的干燥时间约为1.5～2.0 s.

The adiabatic saturation temperature in a flue-gas circulating fluidized bed was analyzed. A device was designed for measuring the temperature in a flue gas desulfurization-based circulating fluidized bed. With the help of this device and on the flue-gas desulfurization pilot test rig measurements were taken of the temperature distribution of the flue gas and wet ball temperature distribution in the fluidized bed. The results of the measurements indicate that after the injection of humidifying water there exist in the circulating fluidized bed two different temperature fields, i.e., one being characterized by a gradual lowering of flue gas temperature and another one featuring a gradual rise of the humidifying water temperature. The flue gas temperature underwent two stages, namely, a rapid reduction and a slow reduction of temperature. However, the humidifying water experienced a rapid rise in temperature and then evaporated. Upon completion of the liquid-droplet drying process the flue gas temperature and the humidifying water temperature tend to coincide. Test results also indicate that the drying time of the atomized liquid droplet in the flue gas circulating fluidized bed is approximately 1.5~2.0 seconds.