多级增湿对半干法烟气脱硫影响的实验研究

在烟气处理量1-500 m3/h的试验台上,研究半干法烟气脱硫工艺中增湿水和循环灰对脱硫效率的影响.在不同位置,按照不同增湿级数、不同比例、不同分配方式进行增湿活化,同时研究了不同循环倍率下的循环灰和增湿水共同作用脱硫的效果.结果表明,增湿水量和脱硫灰的循环倍率是影响脱硫效率的关键因素,在没有循环灰情况下,采用三级喷水,递减增湿的方式,系统的脱硫效率由没有增湿水时的86.5%增加到91%.增大循环倍率有利于系统脱硫效率的提高,当钙硫摩尔比.1.54、循环倍率为18时,系统的脱硫效率可达到95%.当增湿水和灰循环综合作用时,增湿级数越多,循环灰的增湿越均匀,脱硫效率越高.当循环倍率为19.16、三级增湿,增湿水量为33%时,系统的脱硫效率可达到97%.

Experimental study on influence of multi-stage humidification on semi-dry flue gas desulfurization

A multi-stage humidification experiment was carried out at a 1 500 m^3/h scale circulating fluidized bed to study influences of humidification water and circulation ash on SO2 reduction in semi-dry flue gas desulfurization. The humidification water was injected into the system at different injection point with different stages, percentages, and distribution modes. The effect of recycle ash was also investigated with different recycle ratio and moisture humidity ratio. The results indicated that the humidification percentage and ash recycle ratio are critical for SO2 removal. Without ash recycle, the desulfurization efficiency was increased from 86.5% without humidification to 91% with three stages decreasing mode humidification. Ash recycle is profit for SO2 removal, and the system desulfurization efficiency was 95% when mole ratio between Ca and S was 1.54, and ash recycle ratio was 18 without humidification. The system desulfurization efficiency reached 97% with three stages, 33% humidification, and 19.16 recycle ratio.