In dry injection deacidification system, the reactant is injected into the inlet flue duct of the bag filter by means of pneumatic transmission and is fully mixed with the flue gas before entering the bag filter. The solid reaction bed was formed on the filter-bag, removing the acid gas in the flue gas (SO2, HCl).

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The system can not only remove the acid gas in the flue gas, but also protect the bag filter during the starting-up process of the waste incinerator. Lime powder can be injected through the dry process for bag filter pre-coating, which can prevent the blocking of filtration poles by oil contamination and fly ash and can thus protect the bag filter.