Only obstacle in direct use of Pet Coke is its high Sulphur content. But this can be controlled by simple processes.
Use of Limestone with Pet Coke, one can capture certain percentage of Sulphur Dioxide emission. Limestone also act as bed material allows to maintain bed temperature. Approx size of lime stone to be used is 2 – 3 mm size particle.
FGD Scrubbers are used to take additional control over SOx emission. May also require Wet Precipitator in addition to a Dry Electrostatic Precipitator (ESP) and wet FGD.