A Study on Desulphurization of Flue Gases by the Active Carbon Process Using Steam Desorption (Part 2)

Abstract

The dry desulphurization test plant with active carbon was estabilshed and was operated continuously for 1, 200 hours. The capacity of test plant for flue gases treatment was 1, 200Nm3/hr. The adsorber consisted of the cross flow type traveling bed system where the active carbon moved downward very slowly, the flue gases were conducted cross way to the flowing direction of active carbon, and the active carbon adsorbed sulphur dioxide contained in the flue gases.The active carbon which has chemically adsorbed sulphur dioxide was treated by superheated steam in the travelling bed type desorber to desorb sulphur dioxide.The test plant was operated almost smoothly throughouthe continuous operation period. However, decrease in degree of desulphurization was observed. It is considered that the decrease in the degree of desulphurization was caused by deterioration in sulphur dioxide adsorbing capacity of the active carbon. There are two kinds of loss in active carbon, namely, mechanicaloss and chemical loss. As the results of this experiment, the latter was larger than the former.