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

A waste gas and solution technology, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of reduced absorption efficiency, inability to complex NO, etc., and achieve the effect of cost reduction

Active Publication Date: 2008-11-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 rege

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The absorption experiment is carried out in a packed tower with a diameter of 2cm and a height of 100cm. The gas-liquid two-phase flow is countercurrent, the gas velocity of the empty tower is 0.1m / s, and the liquid spray density is 5m 3 / m 2 .hr, 500ml absorption liquid.

[0040] Among them: the concentration of ferrous sulfate is 0.02mol l -1 , EDTA concentration is 0.04mol l -1 , The pH is 6,

[0041] The gas flow rate is 200ml / minute and the temperature is 50℃;

[0042] The gas inlet composition is NO: 480ppm, SO 2 : 1500ppm, O 2 : 5.2%, the rest is nitrogen.

[0043] The absorption liquid enters the packed tower from the top of the tower to absorb NO and SO 2 , Flow into the circulation tank through the bottom of the tower, and then from the circulation tank into a fixed-bed reactor with a height of 50cm and a diameter of 2cm filled with coconut shell activated carbon for catalyst regeneration. The reaction temperature is 80℃, and the liquid in the regeneration tower T...

Embodiment 2

[0045] The reactor and operating conditions are the same as in Example 1, but there is still 0.03mol l in the absorption liquid -1 Calcium oxide, when the operation is stable, the gas outlet concentration is NO: 30ppm, SO 2 : 40ppm.

Embodiment 3

[0047] The reactor and operating conditions are the same as in Example 1, but there is still 0.03mol l in the absorption liquid -1 When the operation is stable, the gas outlet concentration is NO: 30ppm, SO 2 : 40ppm.

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B01D53/60B01D53/78
CPCY02A50/20
Inventor 龙湘犁陶力三李伟袁渭康
Owner EAST CHINA UNIV OF SCI & TECH
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