High-temperature air duct denitration reactor and method therewith for denitration

Abstract

The invention relates to a high-temperature air duct denitration reactor and a method therewith for denitration. The high-temperature air duct denitration reactor is a snake-shaped metal tubular air duct in which an iron wire net is arranged, wherein the inlet of the reactor is communicated with a flue gas NOx separation apparatus while the outlet is communicated with a furnace hearth. The NOx and CO gas flow into the snake-shaped metal tubular air duct and are subjected to a reaction under the catalytic effect of the iron wire net at 600-800 DEG C to reduce the NOx and generate harmless nitrogen and CO2, wherein the CO being not completely reacted is sprayed into the furnace hearth from the outlet of the air duct for being combusted in the furnace hearth. The high-temperature air duct denitration reactor is simple in structure, is convenient to install, is low in cost, and can achieve high-efficient removal of the NOx in the flue gas from the furnace hearth with combination of the flue gas NOx separation apparatus. The CO, as a carrier gas, can be on-site combusted to form CO2 so that secondary pollution can be avoided. The iron wire net, as the catalyst, is free of toxicity and meanwhile can be used for recycling partial heat.

Description

technical field [0001] The invention relates to a high-temperature air duct denitrification reactor and a denitrification method using the same. When used in conjunction with a NOx separation and enrichment device for flue gas, it can not only realize near-zero emission of nitrogen oxides, but also avoid secondary pollution caused by reducing agent discharge. , which belongs to the technical innovation field of coal-fired flue gas pollutant emission reduction. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants, which can form acid rain or acid mist combined with hydrocarbons to form photochemical smog and destroy the ozone layer. Currently, more than 60% of nitrogen oxides come from flue gas from coal combustion. [0003] The "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011) implemented on January 1, 2012 stipulates that the NO emission of all newly built thermal power units should reach 100mg / cm 3 . Starting...

AI Technical Summary

Problems solved by technology

However, there are also certain problems in ammonia denitrification: using ammonia as a reducing agent will cause corrosion to the pipeline, improper control will cause ammonia to escape and cause secondary pollution, and the ammonium salt particles produced will block downstream equipment, and the cost of ammonia production is high.

However, when iron wire is used as a catalyst, it is easily oxidized by oxygen and loses its catalytic effect, so this method is not feasible in conventional flue gas

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