Low-temprature flue gas denitration and poisoning-prevention system

Abstract

The invention discloses a low-temprature flue gas denitration and poisoning-prevention system. In an SCR (Selective Catalytic Reduction) denitration facility, a modified active carbon layer and a multilayered denitration catalyst are arranged along a flowing direction of flue gas in sequence; the modified active carbon layer is used for adsorbing water vapor, SO2, heavy metal and dust in flue gas through physical adsorption and chemical adsorption; the multilayered denitration catalyst is used for removing NOx in the flue gas; the denitration efficiency of a denitration catalyst is guaranteed so that the denitration rate of the denitration catalyst can be stabilized to be a relatively high numerical value; and the problem that a low-temperature catalyst is likely to cause poisoning is solved, active carbon can be cyclically used, byproducts can be utilized and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection and denitrification, in particular to a low-temperature flue gas denitrification anti-poisoning system. Background technique [0002] Nitrogen oxide NO x It is one of the main air pollutants. Since the 21st century, the emission of sulfur dioxide in my country has been basically controlled, but NO x Emissions are rising rapidly, NO x It mainly comes from the exhaust of motor vehicles and stationary sources. It will not only cause acid rain, photochemical smog, ozone layer destruction and climate change, but also cause certain damage to human health. Therefore, in the field of environmental protection, NO x Emission control and pollution control are imminent. As a terminal treatment technology, selective catalytic reduction technology SCR is the current method to control NO in flue gas from fixed sources. x one of the most effective techniques. Among them, the catalyst is one o...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a low-temperature flue gas denitrification anti-poisoning system for the above-mentioned defects in the prior art, which ensures the denitrification efficiency of the denitrification catalyst and stabilizes the denitrification rate of the denitrification catalyst at a relatively high level. Numerically, the problem of easy poisoning of low-temperature catalysts is solved, activated carbon can be recycled, and by-products can be utilized, reducing production costs

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