Abstract:In order to remove the fine particles (PM2.5) from ammonia desulfurization system by vapor heterogeneous condensation, the dynamic model for condensation growth of polydispersed particles was established. The condensation growth of soluble ammonium sulfate particles was numerically investigated and the growth processes of typical size soluble particles were analyzed and compared to those of insoluble particles. The ammonium sulfate particles of different sizes appear to grow at a similar rate and that more effective particle growth can be achieved in the isothermal system than in the adiabatic system. For the soluble and insoluble particles with the same initial size distribution, the growth rate of the micron soluble particles is higher than that of insoluble particles; whereas the growth rate of the submicron soluble particles is higher at first and then lower than that of the insoluble particles, thus the growth curves for the two kinds of particles have a cross point. The growth of ammonium sulfate particles can be significantly promoted by increasing vapor saturation. Strong influence of gas temperature on growth of ammonium sulfate particles in the isothermal system is observed whereas the effect of gas temperature on particle growth in the adiabatic system is very weak.