Conversion of Sulfur Dioxide to Sulfur Trioxide SO2 → SO3
After the molten sulfur is descaled in the sedimentation ponds, it is time for SO2 gas, which firstly its temperature is reduced by passing through a 13-ton boiler and passing through a tank called a gas filter to remove impurities and suspended particles. The filter gas tank is filled with silica grains through which the passing gas is refined and its temperature is reduced at this stage to enter the converter tank.
The converter is a 4-bed tank in which each bed converts part of the SO2 gas into SO3 gas in reaction with the materials charged inside each bed as a catalyst (vanadium pentoxide).
The presence of 4 substrates in this tank is for the complete conversion of SO2 gas to SO3 gas, and also plays a very important role in controlling and preventing environmental pollution.
In each substrate, after the reaction of SO2 gas with catalysts, the gas temperature increases significantly, so the gas is cooled by five heat exchangers and enters the next substrate when it reaches the desired temperature.
