Integrative device and method for flue gas denitration at low temperature

Abstract

The invention provides an integrative device and method for flue gas denitration at low temperature. The device comprises an absorption tower, an aerated conduit, a mixer, a hydrogen peroxide storage tank, a potent agent storage tank, a synergist storage tank, a spraying system, demisters, hydrocyclones and micro-nano bubble generators, wherein the spraying system comprises circulating pumps and spraying devices, and a flue gas inlet is formed in the absorption tower; in the tower, the hydrocyclones, the spraying devices and the demisters are arranged above the flue gas inlet in sequence; the tail end of the aerated conduit is connected with air inlets of the micro-nano bubble generators, and air outlets of the micro-nano bubble generators are formed in the bottom of the tower; liquid inlets of the circulating pumps are communicated with the bottom of the tower, and liquid outlets of the circulating pumps are connected with the spraying devices; liquid outlets of the hydrogen peroxide storage tank, the potent agent storage tank and the synergist storage tank are connected with liquid inlets of the mixer respectively, and liquid outlets of the mixer are connected to the pipelines between the circulating pumps and the spraying devices. According to the integrative device and method, hydrogen peroxide can be mainly used as oxidant, investment and operation costs are reduced, and the device has high oxidation efficiency on nitrogen oxide of low-temperature flue gas.

Description

technical field [0001] The invention relates to a device and method for low-temperature denitrification of flue gas, in particular to an integrated device and method for low-temperature denitrification of flue gas, belonging to the field of flue gas denitrification. Background technique [0002] With the increasingly severe situation of my country's atmospheric environment, the environmental protection standards for controlling the emission of air pollutants have also been continuously improved. At present, according to the latest standard (GB 28662-2012), the NO x The concentration shall not exceed 300mg / Nm 3 . Under the current emission standards, about 16% of domestic sintering machines need to install denitrification equipment with a denitrification efficiency of more than 50%. [0003] At present, there is no mature denitrification technology for sintering machine flue gas. The technologies currently being demonstrated in projects mainly include low-temperature SCR m...

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Problems solved by technology

[0008] The present invention aims to solve H 2 o 2 Oxygenated flue gas NO x , the liquid phase H 2 o 2 The problem of low oxidation efficiency is to provide a device for sintering flue gas denitrification, which mainly uses hydrogen peroxide to oxidize low-temperature flue gas (≤280°C, such as sintering machine flue gas), and can achieve a higher NO x Removal rate, meet the relevant national emission standards

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