The flue-gas desulphurization process is the system of removing harmful sulphur pollution from gases emerging from a boiler. Sulphur compounds such as sulphur dioxide are commonly produced by burning fossil fuels. These toxins are then released into the air as pollution. The system of desulfurization can be classified into six main categories: wet scrubbers, spray dry scrubbers, sorbent injection processes, dry scrubbers, regenerable processes combined removal processes. While these categories of removal systems are currently in use, new developments in sorbent injection technologies are in progress. This type of FGD is our current priority in the FGD market.