The abatement of fine particles from desulfurized flue gas by heterogeneous vapor condensation coupling two impinging streams

Abstract

A novel process was proposed for fine particles abatement via heterogeneous vapor condensation coupling two impinging steams (TIS) technique in this paper. The essential supersaturation was established by adding steam or humid air into desulfurized flue gas, and the application of TIS technique in this process made the mixture of desulfurized flue gas and humid air or steam more sufficient. The fine particles were enlarged by the heterogeneous vapor condensation and the collision-coalescence in two impinging steams condensational growth chamber (TISCGC), then the enlarged fine particles were intercepted by a wire mesh demister at the top of TISCGC. The results indicated that the enlargement of fine particles in TISCGC was more significant than that of conventional condensational growth chamber (CCGC), thus the fine particle removal performance of wire mesh demister was better. The removal performance of fine particles by this process was influenced by many factors, such as flue gas velocity of opposing jets in TISCGC, additive amount of steam or humid air and the desulfurized flue gas temperature. Under the optimum conditions, the removal efficiency of TISCGC could be increased to 50–60% by using this process.