The invention provides a circulating pretreatment
system for
carbon dioxide capture of a
coal-fired power
plant. The circulating pretreatment
system comprises a
water washing tower, a plurality of filler layer bodies disposed inside the
water washing tower and distributed from bottom to top, a circulating
water cooler, an automatic alkali adding device and a
salinity adjustment device. In the pretreatment
system, the combination of the filler
layers is adopted to completely remove harmful substances such as dust and SO2 in
flue gas, thereby improving the
water washing efficiency and achievingthe purpose of reducing the temperature of the
flue gas; the automatic alkali adding device and the
salinity adjustment device are disposed outside the water washing
tower, the alkaline adding amountcan be automatically adjusted according to the pH setting value of the circulating washing water so as to effectively remove the content of acidic substance in the
soot, thereby guaranteeing the waterwashing effect of the
flue gas; water can be automatically supplemented according to the
salinity of the circulating washing water, and scaling due to excessive salinity is prevented. The circulatingpretreatment system for
carbon dioxide capture of the
coal-fired power
plant is high in water washing efficiency and good in
cooling effect, and
automatic control of the pH value and salinity in circulating washing water is realized.