Ammonium sulphate-limestone method for desulphurization of flue gas

Abstract

The invention provides an ammonium sulphate-limestone method for desulphurization of flue gas, and specifically provides a wet desulphurization method using limestone as a raw material and ammonium sulfate as a process absorbent. The method is as below: 5-40 wt% of ammonium sulfate is used as the process absorbent, and limestone (calcium carbonate) is used as an absorbent; flue gas enters an absorbing tower from a middle part of the absorbing tower, countercurrent contacts with an absorption liquid for mass transfer and leaves from top of the tower; slurry at tower bottom circulates in the absorbing tower; part of the slurry is sent to desulfurized slag dehydration technology water recovery system. The invention has the beneficial effects that the absorbing tower desulphurization speed is accelerated, so that a same tower can process more flue gas; the absorbing tower has large operating elasticity and stable operation with low energy consumption; partial denitration can be realized while desulphurization; desulfurized slag post-treatment operations reserve larger integral utilization space and comprise a calcining operation for recovering sulfur dioxide.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment. The invention relates to a method for removing sulfur dioxide, more specifically, a wet desulfurization method using limestone as a raw material and ammonium sulfate as a process absorbent. Background technique [0002] More than 90% of my country's energy structure uses coal as power, and burning coal will produce SO 2 , among which the power plant emissions are the largest, by SO 3 The acid rain pollution damage area mainly caused by acid rain has accounted for about 40% of the country's land area, and the economic loss caused by it has reached hundreds of billions of yuan every year in the country. [0003] At present, there are more than 100 methods of flue gas desulfurization in the world, and there are about 20 methods used in industry. Among them, the application of wet desulfurization technology accounts for about 85% of the entire industrialized desulfurization equipment, and ...

AI Technical Summary

Problems solved by technology

In addition, the by-product gypsum cannot reach the application grade, and is generally discarded as waste, and the high operating cost has become a restrictive factor.

The above-mentioned limestone / gypsum method has high desulfurization efficiency, but it is difficult to further improve the desulfurization efficiency

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