Device for removing SO2 pollutant in flue gas and method thereof

Abstract

The present invention discloses a method and a device dedicated for removing the SO2 pollutant in the flue gas. The method makes the limestone slurry drop into fine mist and electrifies the mist by electrostatic spraying mode, mixes the mist with the flue gas containing SO2 in opposite flow direction for reaction, absorbs the SO2 of the flue gas into liquid phase, and oxidizes the liquid phase desulfurization product to gypsum by blowing air. The device is provided with two parts, wherein the upper part is a slurry washing and absorbing region and the lower part is an air agitating and oxidizing region. The method adopts electrostatic spraying mode, is good in mist droplet dispersibility and high in coverage density, thereby strengthening the gas-liquid mass transfer of the desulfurization and improving the desulfurization efficiency. The invention realizes the electrostatic spraying, SO2 absorption and product oxidization in one reactor, not only realizes high efficiency for removing SO2 pollutant, but also effectively prevents secondary pollution.

Description

technical field [0001] The invention relates to a special method for removing SO in flue gas 2 The device and method for pollutants, more specifically relate to a device and method for electrostatically spraying limestone-gypsum wet flue gas desulfurization. Background technique [0002] SO from coal-fired power generation 2 Pollutants put enormous pressure on the environment. In recent years, my country's "two control areas" SO 2 Although the pollution has been controlled to some extent, the form is still very serious. The acid rain area is still expanding, even crossing the Yangtze River, causing large-scale ecological damage and causing huge economic losses. As the country attaches great importance to environmental quality and ecological protection, it is an urgent and important task to develop effective flue gas desulfurization (FGD) devices and methods. [0003] Limestone-gypsum wet flue gas desulfurization is a relatively mature flue gas desulfurization method. Acc...

AI Technical Summary

Problems solved by technology

Since the 1980s, my country's FGD has been in a state of research and introduction. Especially in the past ten years, through the unremitting efforts of Chinese scientific and technological workers, FGD and some equipment have been researched and improved, and the system availability has been improved. , and some new technologies and processes have also appeared, but the FGD projects constructed in my country generally have shortcomings such as large investment, high operation and maintenance costs, large water consumption, and lack of economic efficiency.

Especially when it comes to SO 2 Small and medium-sized enterprises that emit SO 2 Emissions control targets are extremely difficult

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