Abstract: Abstract:The capacityextending reformation of the desulphurization system of the 600MW supercritical unit in a power plant was introduced. The advantages of merging the induced draft fan and the booster fan into single one was expounded. According to qualitative analysis and quantitative calculation, it is determined that the reformation will bring significant economic benefit for the power plant.

Key words: Key words:supercritical unit, heat supplying unit, steamdriven induced draft fan, desulphurization system