Low-temperature flue gas denitrification and poisoning prevention catalytic reaction system

Abstract

The invention belongs to the field of environment protection and particularly relates to a low-temperature flue gas denitrification and poisoning prevention catalytic reaction system. A metal conductor in the low-temperature flue gas denitrification and poisoning prevention catalytic reaction system is fixed on a top insulated fixing frame, connected with two electrodes of a high-voltage DC power module to form an electric field, and inserted into a catalyst gap; and the lower part of the metal conductor is in a plate form, is relatively large in adsorption area and is mainly used for adsorbing fine dust, and the upper part of the metal conductor is in a strip form and is mainly used for adsorbing an ammonium salt in a catalyst channel. Multiple layers of catalysts for removing nitric oxide are arranged in the system; and impurities adsorbed on the metal conductor are regularly cleared by using a vibration device, and the impurities fall into an ash bucket at the lower part, so that the adsorption efficiency is improved. Through electrostatic adsorption of the impurities, coverage of the impurities on the catalyst surface is reduced, the problem of poisoning of a low-temperature catalyst due to ammonium salt coverage or catalyst sulfation is solved, the reaction activity of a low-temperature flue gas denitrification catalyst can be greatly improved, and the service life of the low-temperature flue gas denitrification catalyst can be greatly prolonged.

Description

technical field [0001] The invention belongs to the field of environmental protection, is suitable for dust removal and denitrification treatment of boiler flue gas and industrial tail gas, and specifically relates to a low-temperature flue gas denitrification anti-poisoning catalytic reaction system. Background technique [0002] The sharp increase in industrial waste gas, especially NOx emissions, has led to increasingly serious environmental pollution. In recent years, with the improvement of environmental protection requirements, the emission standards of industrial waste gas have become stricter. Selective catalytic reduction (SCR) flue gas denitrification technology using ammonia as the reducing agent, most of the catalysts are V 2 o 5 / TiO 2 or modified V 2 o 5 / TiO 2 , the working temperature is generally higher than 350 ℃. Therefore, the SCR reactor can only be arranged between the economizer and the dust collector to ensure the denitrification reaction in th...

AI Technical Summary

Problems solved by technology

This method is simple to assemble, but the active carbon needs to be replaced frequently, the flue gas pressure drop is large, and the cost is high

In summary, the existing technologies are difficult to continuously and effectively solve the problem of low-temperature catalysts being affected by ammonium salt coverage or poisoning.

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