热水循环流化床锅炉高、低速混合床节能改造及效果

针对1台29MW热水锅炉热效率低和飞灰含量高等问题，改两级分离的高速循环流化床锅炉为带高温旋风水冷分离器的高、低速混合循环流化床锅炉；将分离器中心筒插入深度从原来的30％增大到100％，并在分离器中心筒底部增设缩口使烟气流速增大15m／s。实践表明：锅炉热效率提高19个百分点；节煤量远大于分离器电力消耗的增加；分离器飞灰含量降低28个百分点。

Energy saving Transformation and Effect of Fluidized bed Mixed with High Speed and Low Speed in Hot water Circulating Fluidized Bed Boilers

In order to solve problems of low thermal efficiency and high fly-ash content in a hot-water boiler of 29 MW, the transformation of changing high-speed CFB boiler of two-stage separation to high-low-speed circulating fluidized bed boilers with water-cooled high-temperature whirlwind separator, increasing the center cylinder depth of separator to 100% from 30% and increasing the flue velocity to 15m/s by the contraction design at the center cylinder bottom in separator has been put into practice. Results show that the thermal efficiency of CFB boiler is increased by 19%, the saving-coal amount is more than the power increase of separator and the fly＇ash content of separator is decreased by 28%.