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Method of flue gas denitration with ionic liquid and urea

A technology of ionic liquid and urea, which is applied in the field of wet flue gas denitrification, can solve the problems of easy loss, difficult storage and transportation, and strong corrosion, and achieve the effects of low volatility, strong corrosion and low price

Active Publication Date: 2017-01-04
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned absorbing solution is effective for NO 2 The absorption efficiency is high, but there are problems such as strong corrosion, easy loss, difficult storage and transportation, etc.

Method used

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  • Method of flue gas denitration with ionic liquid and urea

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Comparison scheme
Effect test

Embodiment 1

[0023] Ethanolamine lactate ionic liquid and urea are dissolved in water to form an absorption liquid, the mass percentage of ionic liquid in the absorption liquid is 5%, the mass percentage of urea in the absorption liquid is 8%, and then injected into the spray absorption tower , the temperature in the spray absorption tower is 25°C, and the liquid-gas ratio in the spray tower is 20L / m 3 , so that the absorption liquid and the NO 2 The original flue gas is reversely contacted by spraying to realize wet denitrification.

Embodiment 2

[0025] Ethanolamine lactate ionic liquid and urea are dissolved in water to form an absorption liquid, the mass percentage of ionic liquid in the absorption liquid is 8%, the mass percentage of urea in the absorption liquid is 8%, and then injected into the spray absorption tower , the temperature in the spray absorption tower is 30°C, and the liquid-gas ratio in the spray tower is 18L / m 3 , so that the absorption liquid and the NO 2 The original flue gas is reversely contacted by spraying to realize wet denitrification.

Embodiment 3

[0027] Ethanolamine lactate ionic liquid and urea are dissolved in water to form an absorption liquid, the mass percentage of ionic liquid in the absorption liquid is 10%, the mass percentage of urea in the absorption liquid is 8%, and then injected into the spray absorption tower , the temperature in the spray absorption tower is 45°C, and the liquid-gas ratio in the spray tower is 15L / m 3 , so that the absorption liquid and the NO 2 The original flue gas is reversely contacted by spraying to realize wet denitrification.

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Abstract

The invention discloses a method of flue gas denitration with ionic liquid and urea. The method includes the steps that absorbing liquid is formed by cholamine lactate ionic liquid, urea and water, and flue gas denitration is carried out in a conventional spray absorbing tower. When the mass fraction of the ionic liquid in the absorbing liquid is 5-10%, the mass fraction of urea is 8-12%, the liquid-gas ratio is 10-20 L / m<3>, and the absorbing temperature is 25-50 DEG C, the removal rate of NO2 is up to 95%. The method has the advantages that the absorbing liquid is environmentally friendly, convenient to transport and store, low in corrosivity, high in denitration efficiency and not prone to generating secondary pollution, and the method has broad application prospects in the field of coal-fired flue gas cleaning field.

Description

technical field [0001] The invention belongs to the field of atmospheric pollutant treatment and relates to a method for wet flue gas denitrification by using ionic liquid and urea. Background technique [0002] NO x (mainly including NO and NO 2 ) is the main air pollutant emitted by coal-fired boilers, which poses a great threat to human health and the natural environment. Flue gas denitrification has always been the focus of air pollution control. At present, the industrial flue gas denitrification mainly adopts the SCR method. The SCR method has high denitrification efficiency and mature technology, but its investment and operation costs are high, and it is not suitable for high-sulfur coal and high-alkali metal coal flue gas. Therefore, it is urgent to explore new flue gas denitrification technologies. [0003] Wet flue gas denitrification has always been the direction of research in the field of air pollutant control. The basic idea is to oxidize NO in flue gas to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56B01D53/79
CPCB01D53/79B01D53/8628B01D53/90B01D2251/2067B01D2255/705Y02A50/20
Inventor 程广文姚明宇李阳杨成龙杨嵩付康丽赵婷雯赵瀚辰蔡铭
Owner XIAN THERMAL POWER RES INST CO LTD
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