PROCEDE POUR LA PURIFICATION DES GAZ D'EVACUATION DANS UN FILTRE ELECTRIQUE

摘要

1. A process of producing an SO3 -containing gas wherein sulfur is burnt in a furnace with blower-fed combustion air to produce a high-SO2 combustion gas, which is passed through a converter for the catalytic conversion of SO2 in the presence of oxygen to SO3 and is admixed to a water vapor-containing exhaust gas before the latter is purified in an electrostatic precipitator, and the furnace is fed with the sulfur in liquid form by a proportioning feeder and with combustion air through an air heater, characterized in that the air heater is controlled in dependence of the sulfur supply rate by control signals transmitted by a direct line from the proportioning feeder to the air heater so that combustion air at higher temperatures is fed to the furnace in case of a lower sulfur supply rate.