Low-temperature NOx enriching and removing system and method

Abstract

The invention provides a low-temperature NOx enriching and removing system, which is used for removing NOx in low-temperature smoke by adopting an intermediate-temperature SCR catalyst, reducing the heat required by heating NOx-containing smoke, greatly reducing the energy consumption and system operating cost, reducing the investment scale of equipment, meanwhile enriching NOx in smoke, improving the relative concentration of the NOx in the smoke, greatly reducing the treating amount of smoke of SCR denitration, solving the problem of low SCR denitration performance of the low-temperature smoke, and saving energy resources. The low-temperature NOx enriching and removing system is characterized by comprising an NOx enriching device, wherein the NOx enriching device comprises a smoke inlet, a smoke outlet, a heating medium inlet, a heating medium outlet, a cooling medium inlet and a cooling medium outlet; and the dust remover is connected with the smoke inlet through a smoke exhaust fan, the smoke outlet is connected with a chimney, the heating medium outlet is sequentially connected with an SCR reactor, an exhaust fan and the chimney, and an ammonia gas mixer is connected between the heating medium outlet and the SCR reactor. The invention meanwhile provides a low-temperature NOx enriching and removing method.

Description

technical field [0001] The invention relates to the technical field of combustion flue gas treatment, specifically a low-temperature flue gas NO x Enrichment and removal system and method thereof. Background technique [0002] NO X The source of the gas is mainly the combustion of chemical fuels, including coal-fired power plants, industrial furnaces, motor vehicle exhaust, etc., which are more harmful to the human body. The country has NO X The emission of the 12th Five-Year Plan has been included in the total control target, the emission standard has been raised, and the emission concentration has been reduced. This requires the selection of energy-saving and efficient flue gas denitrification technology. [0003] At present, selective catalytic reduction (SCR) flue gas denitrification technology is the most effective flue gas denitrification technology, especially NH 3 The SCR technology as the reducing agent is becoming more and more mature. According to the applica...

AI Technical Summary

Problems solved by technology

[0004] In view of the existing above-mentioned problems, the present invention provides a low-temperature flue gas NO X Enrichment removal system and method thereof, using medium temperature SCR catalyst to remove NO in low temperature flue gas X , reducing heating with NO X The heat required by flue gas greatly reduces energy consumption and system operating costs, reduces equipment investment scale, and enriches NO in flue gas X , to increase NO in flue gas X relative concentration, greatly reducing the processing capacity of SCR denitrification flue gas, solving the problem of low economic performance of low-temperature flue gas SCR denitrification technology, and saving energy. The invention also provides a low-temperature flue gas NO X Enrichment and removal method

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