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 CO

2

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£ CO

2

to fix CO

2

. 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 distributi

on 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

CO

2

- water vapor = 8： 2 temperature 650 ~ 720 ℃

and fluid condition with gas-solid particle complete contact.