Abstract: A model of fluidized bed gas-solid reaction with simultaneous considering fluid, mass-transfer and chemical reaction of gas-solid two phases is established by using CFD fluent software and based on Eulerian multiphase fluid model. The coupling between gas-solid fluid, heat transfer, mass transfer and chemical reaction is realized by UDF (User Define Function) program. The study purposes are (a) the CO₂ gas reacts with free calcium oxide in slag to form calcium carbonate led to strengthening the stability of slag and extending its application field; (b) the molten slag can be used as an adsorbent o£ CO₂ to fix CO₂. The numerical simulation of reaction process of fluid bed carbonation reactor with diameter 0. 24 m and height 1 m has been carried out to get the distribution of solid phase volume percent, velocity vector and concentration field in reactor, and the changing rule of chemical reaction rate. It is obtained that the optimum reaction conditions are gas rate 0. 2 m/s, radius of particle 90 〜150 μm, CO₂- water vapor = 8： 2 temperature 650 ~ 720 ℃, and fluid condition with gas-solid particle complete contact.

摘要： 应用CFD fluent软件,以欧拉多相流模型为基础,建立流化床气固反应模型,该模型同时考虑了气固两相流动、传质和化学反应。通过UDF(User Define Function)自定义程序,实现气固两相流动、传热、传质、化学反应的耦合。研究目的为:(1) CO₂气体与钢渣中游离氧化钙反应生成碳酸钙,从而使渣的稳定性得以加强,拓展其应用领域;(2)熔渣可以作为CO₂的吸附剂,使CO₂得以固定。对直径0.24 m、高度1 m的流化床碳酸化反应器的反应过程进行数值模拟,获得了反应器内固相的体积分数、速度矢量和浓度场分布以及化学反应速率变化规律。得出最佳反应条件为:气速0.2 m/s,粒度(半径)90～150μm, CO₂:水蒸气=8:2,温度650～720℃,气体与固体颗粒充分接触的流化状态。

关键词: 钢渣处理, 碳酸化反应, 游离氧化钙, 数值模拟