Novel limestone-gypsum wet flue gas desulfurization additive

Abstract

The invention belongs to the technical field of wet flue gas desulfurization and in particular relates to a novel limestone-gypsum wet flue gas desulfurization additive which is prepared from vinegar liquid subjected to biomass pyrolysis carbonization, or is a composite additive prepared by mixing the vinegar liquid with any one or more of organic acid, organic acid salt, inorganic metallic salt, an active agent and an oxidizing agent in a traditional wet desulfurization additive. The additive disclosed by the invention has the effects of effectively reducing soil-liquid mass transfer resistance in desulfurization slurry and stabilizing the pH value of the slurry so as to improve the desulfurization efficiency; furthermore, the additive containing the oxidizing agent can be used for accelerating the catalytic oxidation of a wet desulfurization product (calcium sulfite) so as to increase the reaction rate of limestones in the slurry and improve the quality of a wet desulfurization by-product (gypsum).

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 is one of the few countries in the world that uses coal as the main energy source. It is not only the largest coal producer but also the largest coal consumer in the world. In my country's primary energy and power generation energy structure, coal occupies an absolute dominant position. my country's coal generally has the characteristics of high sulfur content, so the control of coal burning SO 2 Emission has become one of the most urgent tasks in the field of air pollution control in my country. Among many desulfurization methods, limestone-gypsum wet desulfurization is widely used due to its mature technology, high desulfurization efficiency, abundant sources of absorbent, and availability of by-products. In my country, more than 85% of coal-...

AI Technical Summary

Problems solved by technology

Among many desulfurization methods, limestone-gypsum wet desulfurization is widely used due to its mature technology, high desulfurization efficiency, abundant sources of absorbent, and availability of by-products. In my country, more than 85% of coal-fired units use limestone-gypsum wet desulfurization. Desulfurization technology; however, due to the instability of my country's coal market at this stage, many coal-fired power plants have long-term burned coal types that exceed the design sulfur content, resulting in high sulfur content in the flue gas of power plant boilers, which further causes the widespread operation of wet desulfurization systems. High maintenance costs, substandard efficiency, low gypsum quality, serious fouling and clogging of subsequent equipment in the absorption tower, etc.; in the face of increasingly stringent environmental protection emission standards, there are currently three main methods to solve these problems: one is to increase the desulfurization equipment The second is to control the sulfur content of coal-fired coal; the third is to use desulfurization additives; among them, the desulfurization equipment expansion and reconstruction project has a long cycle, high economic costs, and poor adaptability to the sulfur content of coal types; controlling the sulfur content of coal-fired coal will substantially increased fuel costs