Method for synchronously treating the combined pollution exhaust gas containing nitric oxide and sulfur dioxide

Abstract

The invention relates to a method for simultaneous treatment of mixed pollutant exhaust gas containing NOx and SO2. Absorption liquid of ferrous salt, ethylenediaminetetraacetic acid disodium and a desulphurization agent and waste gas containing SO2 and NO are introduced into a conventional reactor to carry out the reaction, thereby realizing the simultaneous absorption of NO and SO2. The absorption liquid after the reaction can be introduced in a liquid-solid reactor which takes activated carbon as a catalyst for regeneration. The method is a low-cost wet desulphurization and denitrification technique with market competitiveness.

Description

Technical field [0001] The invention relates to a simultaneous treatment of NO X And SO 2 The method of mixing pollutant waste gas, especially involving NO and SO in power plant flue gas 2 While removing the method. Background technique [0002] The pollution of acid rain and the harm it causes have become one of the environmental problems that countries around the world pay attention to. SO 2 And NO X They are the two pollutant gases with the most emissions and the most harmful effects. They are also the main substances that form acid rain. In countries where coal is the main energy source, SO produced by coal combustion 2 (1000~4000ppm) and NO X (300~800ppm), it is the main source of industrial waste gas pollution (acid rain hazard). [0003] NO X Is the general term for nitrogen oxides, including N 2 O, NO, N 2 O 3 , NO 2 , N 2 O 5 Wait. NO X The hazard is not only that it is acid rain gas, but also that NO and HCFC can significantly destroy the ozone layer, NO and N 2 O is al...

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Problems solved by technology

[0008] In the next thirty years, many scholars have conducted systematic research on this reaction, but there is still no industrial report, mainly because Fe(II)-EDTA is easily oxidized to Fe(III)- EDTA (see references: Bull.of theChem.Soc.of Jpn., 1968, 41:2234-2239.Ind.Eng.Chem.Res., 1987,26:1468-1472.Inorg.Chem., 1990,29 : 1705-1711.Ind.Eng.Chem.Res., 1993, 32:2580-2594.), and Fe(III)-EDTA cannot complex NO, so that the absorption efficiency drops rapidly

It has been proposed to regenerate Fe(II) with biocatalytic reduction (see references: UnitedStates Patent US5891408.Biotechnol.Prog., 2003, 19:1323-1328.J Chem Technol Biotechnol, 2004,79:835-841.Biotechnology and Bio engineering, 2005, 90: 433-441. Environ Sci Technol, 2005, 39: 2616-2623. J of Chem Technol and Biotechnol, 2006, 81: 306-311.), but this method is only in the exploratory stage at present, to There are still many problems to be solved for large-scale application in the process of waste gas treatment

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