Abstract:
Objective The aim is to reduce the formation of SO3 in the tail gas incinerator by analyzing the effects of operating parameters and gas conditions on the formation of sulfur trioxide (SO3) in the tail gas incinerator of sulfur recovery unit using oxidation absorption process.
Methods In the laboratory, the formation of SO3 was studied by using tube furnace to simulate tail gas incinerator, and the content of SO3 in the outlet gas of reaction tube was determined by controlled condensation method.The effects of different working conditions and gas conditions on SO3 formation were studied only under gas phase conditions.
Results The increase of SO2 and O2 volume fraction would increase the SO3 volume fraction, and the SO3 volume fraction had a linear relationship with the residence time of the reaction gas.The introduction of CS2 in the reaction system could also significantly increase the SO3 volume fraction, but had no significant effect on the SO3 formation rate.A tiny proportion of CH4 in the gas had significant effect on the SO3 volume fraction in the system and increase the SO3 formation rate.
Conclusions It is clarified the relationship between SO3 formation and operating parameters and gas quality conditions of tail gas incinerator.The reaction orders of SO3 formation to SO2 and O2 were 0.87 and 0.45, respectively.The apparent activation energy of SO2 oxidation process was 69.04 kJ/mol.
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