Nitrification tail gas treatment method and system

Abstract

The invention relates to the technical field of environmental engineering, in particular to a nitrification tail gas treatment method and system. The invention provides a nitrification tail gas treatment method, which comprises: 1) carrying out a mixing reaction on nitrification tail gas and an acid to obtain first tail gas and a first mixed solution; and 2) mixing the first mixed solution obtained in the step 1) with an extraction agent, performing extracting and separating to obtain an oil phase and an acid phase. The invention provides a nitrification tail gas treatment system, which comprises: an acid absorption unit, which is used for carrying out a mixing reaction on nitrification tail gas and the acid to obtain the first tail gas and the first mixed solution; and an extraction and separation unit is used for carrying out mixing extraction and separation on the first mixed solution and the extraction agent to obtain the oil phase and the acid phase, wherein the acid absorption unit is in fluid communication with the extraction and separation unit. The nitrification tail gas treatment method and system provided by the invention are low in treatment cost and low in consumptionof acid and alkaline solutions or adsorbents, and the treated tail gas can be directly discharged.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a treatment method and system for nitrification tail gas. Background technique [0002] With the rapid development of the domestic economy, nitrogen oxides (NO X ) The discharge of pollutants has increased rapidly, seriously polluting the ecological environment, and has become one of the important factors restricting social and economic development. The control of nitrogen oxides has become an urgent requirement for national economic sustainable development and environmental protection. At present, the treatment methods of nitrogen oxides in nitrification tail gas include: using solid adsorbent combined with regeneration means to treat tail gas containing nitrogen oxides; using two-stage hydrogen peroxide to absorb nitrogen oxides in series; using liquid alkali absorption tower to absorb nitrogen oxides, The NOx is transferred to the liquid phase, generating n...

AI Technical Summary

Problems solved by technology

Nitrogen oxides (NO X ) content is relatively high, the processing cost is higher by the above method, and a large amount of adsorbent or lye is required to be consumed, and it is generally discharged directly after processing, which will cause high consumption of nitric acid in the nitrification system and waste nitric acid raw materials

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