The efficiency of removing inhalable particles in a conventional spray scrubber was examined by the theory of wetting dust removal,and condensation growth properties of inhalable particles in the supersaturated vapor environments were investigated using a condensation growth dynamic model.The results show that the removal efficiency of inhalable particles is only 16% for the conventional spray scrubber,and vapor condensation is able to cause the submicron particles to grow rapidly into big dusty droplets in very short time.For case with vapor saturation of 1.3 and particle number concentration of 105 cm-3,the fine particles with diameter less than 0.5 μm can shoot to around 0.8 μm in 50 ms.The final diameters of condensation droplets are little affected by the initial particle diameter,but depend mainly on initial vapor saturation and particle number concentration.It is found that the final droplet diameter increases with increase of saturation degree of vapor,while it decreases with increase of particle number concentration.These results could be used as a theoretical basis and technical guidance for practical application of vapor heterogeneous condensation to promote condensation growth and effective removal of inhalable particles.
