Ammonia-containing waste gas ultralow nitrogen emission treatment method and system

Abstract

The invention relates to an ammonia-containing waste gas ultralow nitrogen emission treatment method and system. The system comprises an ammonia-containing waste gas conveying pipeline, an oxygen-containing gas conveying pipeline, a combustible gas conveying pipeline, a premixing chamber, a complex maze channel reactor, a tail gas conveying pipeline and a chimney; the combustible gas conveying pipeline is connected with a burner arranged on the complex maze channel reactor; the ammonia-containing waste gas conveying pipeline and the oxygen-containing gas conveying pipeline are connected with an inlet of the premixing chamber separately, an outlet of the premixing chamber is connected with a mixed gas inlet of the complex maze channel reactor, and a tail gas outlet of the complex maze channel reactor is connected with the chimney through the tail gas conveying pipeline. The ammonia-containing waste gas ultralow nitrogen emission treatment method and system have the advantages that the complex maze channel reactor is utilized to achieve a local concentration surface reaction of low-concentration ammonia gas and a coupling interactive oxidation reaction of various organic substances,multi-stage reduction and transformation of nitrogen oxides are also achieved, and finally, ultralow nitrogen pollutant emission of ammonia-containing organic waste gas is achieved.

Description

technical field [0001] The invention relates to the technical field of industrial waste gas purification and treatment, in particular to a method and system for treating ammonia-containing waste gas with ultra-low nitrogen emissions. Background technique [0002] Ammonia (NH 3 ) as a malodorous gas has been included in the discharge standard of odor pollutants in my country, which can cause great harm to the human body and the environment, and is an important source of direct PM2.5. Ammonia and SO 2 , NOx and VOCs react to form aerosol particles, floating in the air will reduce the visibility of the air, falling in the soil will acidify the soil, sinking in the lake will make the lake nutrient, the main component of these aerosol particles is (NH 4 ) 2 SO 4 and NH 4 NO 3 . It can be said that ammonia is the "catalyst" that promotes the formation of PM2.5. [0003] At present, many industries (such as thermal power industry) are widely using the ammonia denitrification...

AI Technical Summary

Problems solved by technology

[0004] The traditional methods to deal with ammonia mainly include biological method, physical method and chemical method. All three methods are applied in industry. Ammonia waste gas is often a multi-component waste gas. Components other than ammonia may inhibit the metabolic activities of microorganisms, thereby affecting degradation. For example, the component that has the greatest impact on the degradation of ammonia is oxygen, because the bacteria that degrade ammonia are Anaerobic bacteria, so the biological treatment of oxygen-containing ammonia waste gas has great limitations

The physical method is mainly divided into absorption method and adsorption method. The absorption method utilizes the characteristics of ammonia as an alkaline gas and is easily soluble in water, and uses acid liquid to absorb and neutralize ammonia and then recovers it; the adsorption method uses porous substances such as activated carbon to absorb ammonia molecules. , and then recover the adsorbent; but these two methods cannot achieve degradation in essence, only realize the transfer of waste gas, and finally produce chemical wastewater and solid waste

Chemical methods include plasma method, catalytic oxidation method, etc. The plasma method uses high-energy electrons or free radicals to impact the molecules to be degraded to decompose them. Catalytic oxidation uses catalysts to reduce the activation energy of the reaction and then react. Effectively remove ammonia in exhaust gas, but there are problems such as high cost and difficulty in industrialization, and there are also problems such as catalyst production, recovery, and regeneration

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