21-01-2016, 03:20 PM
INTRODUCTION AND DEVELOPMENT
The wet sulfuric acid process (WSA process) is one out of many gas desulfurization processes on the market today. Since its introduction in the 1980s, when it was patented by the Danish catalyst company Haldor Topsoe, it has been recognized as an efficient process for recovering sulfur from various process gases in the form of commercial quality sulfuric acid (H2SO4).
PROCESS PRINCIPLE
Contrary to conventional sulphuric acid processes, the WSA process treats the process gas with all of its water content. This means that no cooling/condensation prior to the SO2 conversion stage is required. Consequently, there will be no liquid waste effluent, no loss of acid, no use of cooling water for this part and no loss of heat.
SALIENT FEATURES OF WSA PROCESS :
Compared to other sulphur treatment processes, the WSA process offers a wider range of features:More than 99% recovery of the total sulphur content, always in compliance with environmental legislation.Product is clean, concentrated sulphuric acid of commercial quality, also in turndown situations.Heat of reaction is recovered as superheated or saturated steam.Gases containing hydrocarbons and with even very high CO2 content are accepted.No consumption of chemicals (except for optional DeNOx).Very low consumption of cooling water.No consumption of process water.No liquid or solid waste effluents.Wide turndown range.Simple layout, simple operation, overall attractive economy.Easy to combine with SCR for NOx removal.