关键词: 钢渣处理, 碳酸化反应, 游离氧化钙, 数值模拟

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.