Liquid-phase oxidation-absorption two-stage wet method flue-gas denitration technique

A liquid-phase oxidation, two-stage technology, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of incomplete absorption, high NO2 content, slow hydrolysis rate, etc.

Active Publication Date: 2009-03-18
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of this technology to simultaneous desulfurization and denitrification still needs to solve the problem of resource utilization of by-products
In addition, when treated with a strong oxidant containing chlorine, a considerable part of NO will be oxidized to NO 2 , its hydrolysis rate is slow, so it usually cannot be completely absorbed in the process of simultaneous desulfurization and denitrification, resulting in NO 2 high content

Method used

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  • Liquid-phase oxidation-absorption two-stage wet method flue-gas denitration technique
  • Liquid-phase oxidation-absorption two-stage wet method flue-gas denitration technique
  • Liquid-phase oxidation-absorption two-stage wet method flue-gas denitration technique

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Example 1: Sodium hypochlorite solution oxidizes NO combined with calcium hydroxide slurry to absorb denitrification

[0042]Send the flue gas after desulfurization and dust removal to the oxidation tower, use 0.2% sodium hypochlorite solution as the oxidant to oxidize NO, adjust the pH value of the oxidant to 6 with sulfuric acid, and the NO in the flue gas after oxidation 2 The volume fraction accounts for about 50% of the total nitrogen oxides, and the oxidized NO x Send it to the absorption tower, and use 10% calcium hydroxide slurry as the denitrification absorption liquid to oxidize the NO x Absorption, the denitrification efficiency of this process can reach 85%.

Embodiment 2

[0043] Example 2: Potassium permanganate solution oxidizes NO combined with sodium hydroxide solution to absorb and denitrify

[0044] Send the flue gas after desulfurization and dust removal to the oxidation tower, use 1% potassium permanganate solution as the oxidant to oxidize NO, adjust the pH value of the oxidant to 5 with hydrochloric acid, and the NO in the flue gas after oxidation 2 The volume fraction accounts for about 45% of the total nitrogen oxides, and the oxidized NO x Send it to the absorption tower, and use 5% sodium hydroxide as the denitrification absorption liquid to oxidize the NO x Absorption, the denitrification efficiency of this process can reach 80%.

Embodiment 3

[0045] Example 3: Hydrogen peroxide solution oxidizes NO combined with sodium carbonate solution to absorb and denitrify

[0046] The flue gas after desulfurization and dust removal is sent to the oxidation tower, and 5% H 2 o 2 The solution acts as an oxidant to oxidize NO, and the NO in flue gas after oxidation 2 The volume fraction accounts for about 62% of the total nitrogen oxides, and the oxidized NO x Send it to the absorption tower, and use 15% sodium carbonate as the denitrification absorption liquid to oxidize the NO x Absorption, the denitrification efficiency of this process can reach 90%.

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Abstract

The invention discloses a wet method smoke gas denitration technology of two segments of liquid phase oxidation and absorption, which adopts solution or mixtures of one or more of potassium permanganate, sodium chlorite, sodium hypochlorite, calcium hypochlorite, oxyful and chlorine dioxide as oxidizing agents to ensure nitrogen oxide in smoke gas contact and react with the oxidizing agents. After the nitrogen oxide is partially oxidized into nitrogen dioxide, oxidized nitrogen oxide in the smoke gas is absorbed by alkali liquid to generate corresponding nitrite. The technology adopts liquid phase oxidation to replace gas phase oxidation so as to reduce the investment and the running cost, simplify the technical process and the system structure, and enhance the operability. Compared with a method that oxidation and absorption are simultaneously carried out in the liquid phase, the two-segment technology not only can increase the removal efficiency, avoid secondary pollution caused by incomplete absorption of NO2, but also can achieve the purposes of selectively generating and recovering the nitrite in the absorption stage by controlling the oxidation degree of the oxidation stage.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a liquid-phase oxidation-absorption two-stage wet flue gas denitrification process. Background technique [0002] The main methods of flue gas denitrification are selective catalytic reduction technology (SCR), selective non-catalytic reduction technology (SNCR), wet complexation absorption technology, etc. SCR is the most commonly used denitrification method at present. Although the denitrification efficiency of this technology is high, the basic investment and operation cost are expensive, and the adaptability to medium and high sulfur coal is poor. The sulfur content of coal produced in China is generally high, so it is difficult to promote SCR technology in China. [0003] In order to develop a denitrification technology suitable for my country's current national conditions, many researchers have turned their attention to wet denitrification technology with low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/75B01D53/78
Inventor 吴忠标唐念刘越盛重义王海强
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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