Limestone-gypsum wet-process flue gas desulfurization additive

Abstract

The invention belongs to the technical field of wet-process flue gas desulfurization and particularly relates to a limestone-gypsum wet-process flue gas desulfurization additive. The additive is composed of biomass pyrolyzed and gasified tar washing liquid or is a composite additive which is obtained by combining and mixing the tar washing liquid with any one or more of organic acids, organic acid salts, inorganic metal salts, an active agent and an oxidant in a traditional wet-process desulfurization additive. According to the additive provided by the invention, the solid-liquid mass transferring resistance in desulfurization slurry can be effectively reduced and the pH value of the slurry is stabilized, so that the desulfurization efficiency is improved; and furthermore, the composite additive containing the oxidant can accelerate the catalytic oxidation of a wet-process desulfurization product (calcium sulfite), so that the reaction speed of limestone in the slurry is accelerated and the quality of the wet-process desulfurization byproduct, namely gypsum, is improved.

Description

technical field [0001] The invention belongs to the technical field of limestone-gypsum wet flue gas desulfurization, in particular to a limestone-gypsum wet flue gas desulfurization additive. Background technique [0002] my country's energy consumption is still dominated by coal, and it is one of the countries that emit the most SO2 from coal combustion in the world. Therefore, how to control the emission of SO2 from coal combustion is one of the important tasks in my country at present. Limestone-gypsum wet flue gas desulfurization process is currently widely used in my country's coal-fired power plants and has many advantages. However, the current operation of limestone-gypsum wet flue gas desulfurization devices in thermal power plants in my country generally has high energy consumption and operating costs, poor adaptability to coal sulfur content, serious blockage and fouling of subsequent equipment in the absorption tower, and equipment wear and tear. One of the impor...

AI Technical Summary

Problems solved by technology

However, the current operation of limestone-gypsum wet flue gas desulfurization devices in thermal power plants in my country generally has high energy consumption and operating costs, poor adaptability to coal sulfur content, serious blockage and fouling of subsequent equipment in the absorption tower, and equipment wear and tear. serious problems; one of the important reasons is that many power plants have been burning coal with sulfur content exceeding the design for a long time, resulting in the failure of the desulfurization system to operate normally

In order to meet the increasingly stringent environmental emission standards, many power plants are forced to increase the capacity of desulfurization devices, paying a very high economic price; what's more, the efficiency of desulfurization devices after capacity expansion and improvement is still not up to standard