Flue gas desulfurization synergist for wet desulfurization system, and preparation method and application thereof

Abstract

The invention discloses a flue gas desulfurization synergist for a wet desulfurization system, and a preparation method and the application thereof. The flue gas desulfurization synergist for the wet desulfurization system consists of the following components in percentage by weight: 1 to 49 percent of magnesium salt, 8 to 66 percent of sodium salt and 2 to 43 percent of organic amine. The preparation method of the flue gas desulfurization synergist comprises the following step: mixing and uniformly stirring the magnesium salt, the sodium salt and the organic amine to obtain the flue gas desulfurization synergist for the wet desulfurization system. The flue gas desulfurization synergist for the wet desulfurization system, disclosed by the invention, is applied to wet flue gas desulfurization to effectively remove sulfur dioxide in flue gas and can promote SO2 adsorption and dissolution of limestone, so that the desulfurization degree is improved by 3 to 15 percent and the dissolving speed of the limestone is improved by 6.6 to 20 percent; moreover, desulfurization reaction time is shortened, so that operating cost of flue gas desulfurization is reduced; and meanwhile, the scaling speed of calcium also can be retarded, so that reliability of the system is improved.

Description

technical field [0001] The invention relates to a flue gas desulfurization synergist for a wet desulfurization system, its preparation method and its application in the wet desulfurization system. Background technique [0002] Limestone-gypsum wet flue gas desulfurization process is widely used because of its mature technology, high desulfurization efficiency, abundant sources of absorbent, low price, and availability of by-products. It has become the most widely used method for flue gas desulfurization in coal-fired power plants. However, at present, the 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 serious equipment wear And other issues, with the instability of my country's coal market, many power plants have been burning coal that exc...

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Problems solved by technology

However, at present, the 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 serious equipment wear and tear. And other issues, with the instability of my country's coal market, many power plants have been burning coal that exceeds the design sulfur content for a long time, resulting in the desulfurization system not operating normally. With the implementation of increasingly stringent environmental protection emission standards, many desulfurization devices have been Forced to carry out capacity expansion work

The capacity expansion and transformation of desulfurization devices often cost tens of millions, and the construction period of the transformation is 3 to 4 months, which brings unprecedented economic and environmental pressure to the power plant

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