Intermittent dry method/semi-dry method desulfurized fly ash stabilization modification system and operation method thereof

The invention relates to an intermittent dry method/semi-dry method desulfurized ash stabilization modification system and an operation method thereof. The system mainly solves the problem that the existing dry method/semi-dry method desulfurized fly ash cannot be comprehensively utilized on a large scale, realizes the recycling of waste sulfuric acid, achieves the purpose of treating waste with waste, and creates remarkable economic and environmental benefits. The system is characterized by consisting of a jet aerator, an aeration tower, a gas discharge pipe, a desulfurized fly ash feeder, anacid liquor tank, an acid liquor pump, a slurry discharge pump, a gypsum cyclone, a gypsum dehydrator, an overflow tank and a circulating pump. A conventional one-step oxidation process is decomposedinto multiple steps, and the solid-to-liquid ratio and the slurry pH of each step are accurately controlled, so not only is decomposition of CaSO3 avoided to release SO2, but also sufficient CaSO3 isensured to be in a liquid-