A Study of Experimental and Reaction Models for the Spray Towers of Wet-method Flue-gas Desulfuration

Established was a spray-tower test stand for limestone/gypsum wet-method flue-gas desulfuration.An experimental study was performed of the mechanism governing the impact of important operating parameters on the desulfuration efficiency of a spray tower.The test results show that it is possible to raise the desulfuration efficiency by employing the following measures: raising liquid-gas ratio and slurry pH value,lowering the flue gas temperature and its flow speed,reducing SO2 concentration of the inlet flue gas and performing a forced oxidation.The spray slurry was divided into two existing forms: namely,spray liquid droplets and tower-wall liquid film.Models for them were respectively set up.The desulfuration process of the spray liquid droplets was calculated by using a Gerbec liquid-droplet desulfuration model.The flow of tower-wall liquid film was divided into two states,namely,laminar flow and undulatory laminar flow.A new reaction model for calculating desulfuration in the spray tower has been developed.The calculation results obtained by using the model show that relative to the Gerbec liquid-droplet model,the calculation results of the reaction model under discussion are in better agreement with the experimental data.