A new method and device for
flue gas desulfurization and mercury removal, in which
lime and
fly ash are activated by low-pressure steam in a boiler to enhance the effect of desulfurization and mercury removal. Firstly, the
lime or Ca(OH)2 used as the desulfurization and mercury removal absorbent is activated and mixed with the
flue gas by medium and low pressure
water vapor, and at the same time, part of the
fly ash is circulated to the top of the reaction
tower to be mixed with the
flue gas by medium and low pressure
water vapor; Spray water mist into the reaction
tower at the lower part of the
flue gas distributor, the lower
flue gas temperature is conducive to improving the reactivity of SO2 and Ca(OH)2, the
humidity of the
flue gas is conducive to improving the
utilization rate of the absorbent, and improving the desulfurization and demercuration agent. Absorption properties of mercury vapor. The flue gas enters the bag type or electric bag composite
dust collector after desulfurization and mercury removal in the reaction
tower, and part of the collected
fly ash is transported to the reaction tower for recycling to further improve the
utilization rate of the absorbent; the purified flue gas is sent into the
dust collector through the induced draft fan
Chimney exhaust. The
operating cost of the device is low, and it can achieve high desulfurization and mercury removal effects when used in conjunction with
bag filter or electric bag composite dust removal equipment.