Slurry regulation and control method for limestone-gypsum wet flue gas desulfurization process

Abstract

The invention belongs to the field of environmental protection, and particularly relates to a slurry regulation and control method for a limestone-gypsum wet flue gas desulfurization process. The method comprises the step of in the operation process of a desulfurization system, controlling the concentration of sodium linear alkyl benzene sulfonate in slurry in a desulfurization absorption tower so as to enable the concentration to be lower than a preset value. According to the slurry regulation and control method provided by the invention, starting from reducing the LAS concentration of the slurry, the desulfurization system can normally operate under the condition of high chloride ion concentration, that is, high-concentration-ratio operation of the desulfurization system is realized, so that the discharge amount of desulfurization wastewater can be remarkably reduced. Moreover, the technical difficulty of reducing the LAS concentration is far lower than the technical difficulty of reducing the chloride ion concentration, so that the method disclosed by the invention can realize reduction of the desulfurization wastewater at lower cost, and has better economic benefits.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a slurry control method for a limestone-gypsum wet flue gas desulfurization process. 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 desulfuri...

AI Technical Summary

Problems solved by technology

However, since Cl - The chemical properties of itself are extremely stable, and the Cl - It is very difficult to remove from wastewater, so this method has paid high investment costs and brought great economic burden to the enterprise