Fossil fuels are the main source of sulphur dioxide emissions
The main sources of sulphur dioxide are industrial and commercial energy and heat genera-tion systems, but high quantities of the undesirable gas are also caused by shipping and mo-tor vehicle traffic. For example, the typical SO2 concentration in the flue gas of oil-fired heat-ing systems is between 180 and 220 ppm. A precise SO2 emission measurement is therefore essential. Especially in power plants and waste incineration systems, the sulphur dioxide emission of the cleaned gas is closely monitored by SO2 sensors before it is released into the environment. Additional measurement of the SO2 concentration upstream of the flue gas de-sulphurization can further optimize the combustion and flue gas cleaning processes in order to achieve more efficient utilization of fuels.