The liquid sulphur is quantitatively transferred to sulphur furnace controlled by the jacket insulation metering pump or the jacket insulation gear pump along with the mass flow meter. After burning, the SO2 gas with a temperature of 650℃ passes SO2 cooler to cool the temperature to 420℃, then this cooled SO2 gas enters into SO2/SO3 conversion tower. The conversion tower has 4 layers. The cooling process is completed by plug-in heat exchanger between the first and the second layers when the equipment is designed for a production capacity of more than 2 ton/hour. The temperature of transferred SO3 gas is cooled down to 50℃ through second SO3 cooler. The SO3 gas is then transferred to sulphonation unit through a glass fiber filter.
To improve the device operation life, electric ignition device is used for sulphur ignition, which can be automatically powered off after ignition to avoid its damage caused by inappropriate human operation.
In order to have a full combustion in SO2/SO3 gas generating unit, a porous arc distribution plate is placed, which is made by heat-resistant and aluminum-resistant ceramics. Thus, the liquid sulphur can be evenly distributed in the sulphur furnace. The position of inlet in sulphur furnace is replaced from the top to the side so that the insufficient combusted sulphur will not be taken into SO2 cooler for further burning.
A great improvement regarding the structure of the SO2 cooler has been made: self-compensating high heat SO2 gas entering into the tube, increased tube diameter, thickened tube wall, and double tube sheet being used in the lower part of the cooler, all of which greatly improve the service life of the cooler.
