快速流态化下烟气循环流化床脱硫数学模型

利用以工业石灰,粉煤灰和添加剂制备的高活性吸收剂在循环流化床上进行了脱硫实验,通过对床内流场和温度场的分析,建立了快速流态化下循环流化床的物理模型;在此基础上,针对床内喷水增湿活化脱硫时吸收剂的三种不同物态:新鲜干燥颗粒、干燥再循环颗粒、含水颗粒,分别建立了与之对应的表面覆盖模型、气固反应模型、浆滴脱硫模型;总结得到了快速流态化下烟气循环流化床总的脱硫模型;同时利用模型模拟了各种参数对脱硫效率的影响。经实验验证模型误差在5.2%以内,较以往模型具有更高的精度。该模型对于揭示在快速流态化下循环流化床脱硫过程具有重要意义。

Mathematic Model to Desulfurization of Flue Gas Circulating Fluidized Bed Under Fast Fluidization

The desulfurization experiments were carried out by using highly active absorbent prepared from CaO,FA and additives at a circulating fluidized bed(CFB),physical model of circulating fluidized bed under fast fluidization was established by the analysis of velocity and concentration distribution in reactor.On the basis,a model about flue gas desulfurization under pneumatic transport is proposed according to the analysis of the spraying water that can activate the absorbents,In the model,three factors were taken into account:gas-liquid reaction of slurry droplet,gas-solid reaction of dry circulating particles and surface coverage reaction of dry fresh particles respectively.And then,a gross model was also developed based on CFB flue gas desulfurization,the effects factors on desulfurization efficiencies were simulated,the higher accuracy of the model was obtained than that before with a max error of 5.5%.The model has an important signification for revealing CFB desulfurization under the fast fluidization.