Method for simultaneously removing sulfur dioxide and nitrogen oxide in exhaust air

A technology of nitrogen oxides and sulfur dioxide, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of expensive, unstable and widely used, and achieve simple methods, reduce treatment costs, and economical and reasonable Effect

Inactive Publication Date: 2008-10-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of oxidative absorption of NO by sodium chlorite solution has been widely valued because of its fast oxidation speed, but its wide application is limited due to its high price and instability.

Method used

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  • Method for simultaneously removing sulfur dioxide and nitrogen oxide in exhaust air
  • Method for simultaneously removing sulfur dioxide and nitrogen oxide in exhaust air

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Carried out in a bubbling reactor with a diameter of 2 cm and a height of 90 cm, the amount of liquid added to the reactor is 200 ml, and the concentration of sodium chlorate is 0.04 mol l -1 , the pH value is 6;

[0035] The gas flow rate is 200ml / minute, and the temperature is 50°C;

[0036] The gas inlet composition is NO: 480ppm, SO 2 : 1500ppm, O 2 : 5.2%, the rest is nitrogen.

[0037] The gas outlet concentration is analyzed online by an infrared spectrometer, and it is automatically sampled every two minutes. Within 180 minutes, the gas outlet concentration is NO: 30ppm, SO 2 : 200ppm.

Embodiment 2

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

[0040] Wherein: sodium chlorate concentration is 0.04mol l -1 , the calcium oxide concentration is 0.03mol l -1 , the pH value is 6,

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

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

[0043] The absorption liquid is recycled, and the gas outlet concentration is analyzed online by an infrared spectrometer. Automatic sampling is performed every two minutes. Within 300 minutes, the gas outlet concentration is NO: 15ppm, SO 2 : 50ppm.

Embodiment 3

[0045] Reactor and operating conditions are the same as embodiment 2, only 0.03mol l -1 The calcium oxide is changed to 0.03mol l -1 Magnesium oxide, within 300min, the gas outlet concentration is NO: 15ppm, SO 2 : 30ppm.

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Abstract

The invention provides a wet-method oxidation method for removing SO2 and nitrogen oxides in exhaust gases, which is characterized in that in a routine reactor, water solution of chlorate and desulfurizer is reacted with flue gas containing the nitrogen oxides and SO2, so as to remove the nitrogen oxides and SO2 in the exhaust gas. The wet-method oxidation method of the invention is simple, economical and reasonable, and greatly reduces the disposal cost of the wet-method desulphurization and denitration.

Description

technical field [0001] The invention relates to a method for simultaneous desulfurization and denitrification, in particular to NO and SO in power plant flue gas 2 method of simultaneous removal. Background technique [0002] The pollution of acid rain and its harm have become one of the environmental problems concerned by countries all over the world. SO 2 NOx and NOx are two polluting gases with the largest emissions and the most harmful effects, and they are also the main substances that form acid rain. In countries where coal is the main energy source, coal combustion produces 1000-4000ppm SO 2 and 300~800ppm NO x , is the main source of industrial waste gas pollution and acid rain hazards. [0003] NO x It is a general term for nitrogen oxides, including N 2 O, NO, N 2 o 3 , NO 2 , N 2 o 5 Wait. The harmfulness of NOx is not only that it is an acid rain gas, but also that NO, like chlorofluorocarbons, can significantly destroy the ozone layer. NO and N 2 O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60
CPCY02A50/20
Inventor 龙湘犁李伟陶力三袁渭康
Owner EAST CHINA UNIV OF SCI & TECH
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