A flue gas desulfurization and denitrification device and method

Abstract

The invention discloses a flue gas desulfurization and denitration device and method. The device comprises: a desulfurization container, the bottom of which is equipped with a desulfurization liquid material storage area, above which a flue gas inlet is disposed, with a flue gas washing and desulfurization structure being arranged above the flue gas inlet; a denitration container, the bottom of which is equipped with a denitration liquid material storage area, above which a flue gas washing and denitration structure is arranged, with a separation structure for removing solid particles and liquid drops being disposed above the flue gas washing and denitration structure, and a gas outlet being disposed at the top of the denitration container; an oxidization pipeline for communicating the desulfurization container and the denitration container; an atomization spray structure that is disposed in the oxidization pipeline and capable of providing structure connection together with chlorine dioxide, with the chlorine dioxide mist sprayed by the atomization spray structure being mixed with the flue gas in the oxidization pipeline. The flue gas desulfurization and denitration device and method provided by the invention can realize high efficiency and high utilization oxidation of ClO2 to NO, are safe and convenient to operate, and are convenient for industrial application.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a flue gas desulfurization and denitrification device and method. Background technique [0002] For particulate matter and SO in industrial flue gas 2 Emission control, currently the most widely used in the world is wet flue gas desulfurization technology (WFGD), which is used in the removal of SO 2 At the same time, the particulate matter is removed, and the technology has basically matured. For NO in flue gas X For emission control, commonly used technologies mainly include reduction flue gas denitrification and oxidation absorption flue gas denitrification. Reduction flue gas denitrification mainly includes selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR), that is, nitrogen oxides are reduced to nitrogen by denitrification agents such as ammonia or urea. Oxidative absorption method is to use some oxidant to first remove the ...

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Problems solved by technology

ClO 2 When the solution is oxidized, due to ClO 2 Dissolved in liquid, it is necessary to increase the liquid-gas ratio to improve the gas-liquid contact efficiency, and the entrainment of mist droplets will easily cause a large amount of chlorine dioxide to escape, resulting in low oxidant utilization and additional pollution such as residual chlorine

However, there is no mass transfer barrier in gas-phase oxidation, and the oxidation process is fast and efficient. However, during gas-phase oxidation operation, because chlorine dioxide gas is easily decomposed, there is a risk of explosion, which is not conducive to safe industrial application.

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