The invention relates to a
flue-gas desulphurization
system and a
flue-gas desulphurization method. The
flue-gas desulphurization
system comprises a desulphurization absorbing
tower connected with a limestone
slurry feeding
pipe, a flue-
gas pipeline, a cloth-bag dust remover, a two-stage mist remover, a blower, a
slurry discharging pump I and a hydraulic
cyclone connected with the
slurry discharging pump I, and is characterized in that the hydraulic
cyclone is also connected with a slurry discharging pump II and a filtering
machine; and the slurry discharging pump II is also connected with a
dewatering screen which is also respectively connected with the filtering
machine and a
gypsum stockpile. The flue-gas desulphurization method comprises the following steps that:
flue gas is dissolved in limestone slurry and then oxidized and crystallized to form
gypsum slurry; and the
gypsum slurry is concentrated by the hydraulic
cyclone, the underflow of the hydraulic cyclone is pumped into the
dewatering screen for
dewatering by the slurry discharging pump II, and the overflow of the hydraulic cyclone is fed into the filtering
machine for filtering. According to the flue-gas desulphurization
system and the flue-gas desulphurization method, since the filtering machine and the dewatering screen are additionally arranged behind the hydraulic cyclone of the flue-gas desulphurization system and the dewatering screen is adopted for dewatering, so that the problem of difficult dewatering of the gypsum is effectively solved and the additional value of a gypsum product is high.