Wet flue gas desulfurization system and wet flue gas desulfurization method

Abstract

The invention belongs to the field of environmental protection, and particularly relates to a wet flue gas desulfurization system and a wet flue gas desulfurization method. The desulfurization system provided by the invention comprises a limestone slurrying tank, a limestone-gypsum process flue gas desulfurization tower, gypsum slurry separation equipment, gypsum dehydration equipment, a recovery water tank, wastewater separation equipment, chemical precipitation equipment, an advanced oxidation reactor and an external drainage pipeline. According to the system provided by the invention, the advanced oxidation reactor is additionally arranged, and desulfurization wastewater subjected to advanced oxidation to remove LAS is returned to the desulfurization tower, so that the LAS concentration in the desulfurization tower can be controlled at a relatively low level, the root factor of foaming of the desulfurization tower is eliminated, and the desulfurization system can normally operate under the condition of high chloride ion concentration; therefore, the high-concentration-ratio operation of the desulfurization system is realized, and the discharge amount of the desulfurization wastewater is remarkably reduced. In addition, the COD value of discharged wastewater of the system is low, and good environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a wet flue gas desulfurization system and a wet flue gas desulfurization method. Background technique [0002] As my country's environmental protection continues to increase, flue gas desulfurization devices have been generally installed in the thermal power industry. Limestone-gypsum wet flue gas desulfurization (WFGD) technology has become the leading flue gas desulfurization technology at home and abroad because of its advantages such as wide application range of coal types and high desulfurization efficiency. In the process of flue gas scrubbing by wet desulfurization, the flue gas fly ash is washed into the limestone-gypsum slurry, and harmful substances such as chloride ions and heavy metal ions contained in it also enter the flue gas desulfurization system and are processed in the gypsum During the process, as the flushing water enters the desulfurizati...

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Problems solved by technology

However, since Cl - The chemical properties of itself are extremely stable, and the Cl - It is very difficult to rem

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