Method and device for removing sulfur dioxide in flue gas

The invention relates to a method and a device for removing sulfur dioxide in flue gas, and the method for removing sulfur dioxide in flue gas comprises the following steps: washing the flue gas by using a first absorbent to remove sulfur dioxide in the flue gas without substantially removing carbon dioxide in the flue gas, wherein the first absorbent comprises: (1) a hydroxide of an alkali gold group metal, a hydride carbonate of an alkali gold group metal, a hydroxide of an alkali earth group metal, a hydride carbonate of an alkali earth group metal, or a combination thereof; and (2) a polybasic organic acid; wherein the first absorbent has a pH value of 5 to 6, and the first absorbent has a pH value of 4.1 to 5.5 when washing the flue gas. 一种去除烟道气中的二氧化硫的方法与装置，去除烟道气中的二氧化硫的方法包括：取第一吸收剂洗涤烟道气，以去除烟道气中的二氧化硫而实质上不去除烟道气中的二氧化碳，其中第一吸收剂包括：(1)碱金族金属的氢氧化物、碱金族金属的碳酸氢化物、碱土族金属的氢氧化物、碱土族金属的碳酸氢化物、或上述的组合；以及(2)多元有机酸；其中第一吸收剂的pH值为5至6，且第一吸收剂洗涤烟道气时的pH值为4.1至5.5。