Use lime or limestone slurry absorb SO2 in flue gas, react to generate calcium sulfite, then oxidize calcium sulfite to annaline. Co-Product gypsum can be recyclable.
1. Absorption process is in the absorption tower, the main reaction is as follows:
lime slurry as absorber:
limestone slurry as absorber：
Due to contain oxygen in the flue gas, the following reaction will occur:
2. Oxidation process carry out in the oxidation zone, the main reaction is as follows:
Mature technology, high reliability running, wide range of applications. Sulfur dioxide removal efficiency up to 95%, can adapt to large capacity unit and high concentrations of sulfur dioxide in flue gas esulfurization. Absorber is cheap, and can be produced by-product - gypsum with a commercial value of complex utilization.
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