GEA Bischoff - Removal of Acid Components

The removal of acid components (SO2, HCL, HF) from gases is important in case the cleaned gas is then treated in a sulphuric acid plant. SO3 is removed in wet electrostatic precipitators; HCL is washed out in scrubbers. For the removal of HF GEA Bischoff is using a sodium silicate dosing system. Sodium silicate as 10% water solution is dosed into the scrubber or cooling liquid circuit and quickly reacting with the HF in the gas.