Reduce your operation cost
Sodium carbonate is injected in the process water as the reacting agent to remove SOx in the exhaust gas. This applies to both closed-loop and hybrid configurations.
When running in closed-loop mode, the circulation water must be dosed with an alkaline additive. Up to now this has always been the liquid additive Sodium Hydroxide (caustic soda), but in this unit a powder like sodium carbonate can be used instead.
Taken aboard dry and loaded into a silo, the powder is mixed with desalinated water before entering the closed-loop circuit. This cuts operating costs, and reduces the potential onboard hazard.
SO2 + H2O → H2SO3
Na2CO3 + H2SO3 → Na2SO3 + CO2 + H2O
Na2SO3 + ½O2 → Na2SO4
H2SO3 + ½O2 → H2SO4
Na2CO3 + H2SO4 → Na2SO4 + CO2 + H2O
SO2 + H2O + ½O2 + Na2CO3 → Na2SO4 + CO2 + H2O