Method for using ethylenediamine cobalt (II)/transition metal to perform wet-process flue gas denitration

A transition group metal, ethylenediamine cobalt technology, applied in the field of electric power environmental protection, can solve the problems of reduced denitrification efficiency of absorption liquid, reduced catalytic oxidation performance, restricting the application of cobalt salt catalytic oxidation denitration technology, etc.

Active Publication Date: 2016-12-21
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the above-mentioned alkaline solution of cobalt salt as absorbent for flue gas denitrification can obtain high denitrification efficiency, but there is a main problem: after a period of operation, the catalytic oxidation performance of cobalt salt to NO will decrease, which is manifested as absorption liquid The denitrification efficiency drops
This also seriously restricts the application of cobalt salt catalytic oxidation denitrification technology in engineering

Method used

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  • Method for using ethylenediamine cobalt (II)/transition metal to perform wet-process flue gas denitration
  • Method for using ethylenediamine cobalt (II)/transition metal to perform wet-process flue gas denitration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Let the original flue gas enter from the lower part of the spray absorption tower, and [Co(en) 3 ]Cl 2 Alkaline absorption liquid is in reverse contact from bottom to top, denitrification of flue gas is carried out at 50°C, and the net flue gas is discharged from the upper part of the absorption tower. When the denitrification efficiency decreases, the alkaline absorption liquid is discharged from the spray absorption tower and enters the regeneration reactor. After being treated with Zn powder at 70°C for 2 hours, the alkaline absorption liquid is regenerated, and the regenerated alkaline absorption liquid can be returned to the spray absorption tower to continue denitrification. Wherein, the liquid-gas ratio in the spray absorption tower is 10L / m 3 . The consumption of Zn powder is 1% of the quality of the alkaline absorption liquid to be treated in the regenerative reactor; 3 ]Cl 2 The pH of the aqueous solution was adjusted to 12.

Embodiment 2

[0023] Let the original flue gas enter from the lower part of the spray absorption tower, and [Co(en) 3 ]Cl 2Alkaline absorption liquid is in reverse contact from bottom to top, denitrification of flue gas is carried out at 55°C, and the net flue gas is discharged from the upper part of the absorption tower. When the denitrification efficiency decreases, the alkaline absorption liquid is discharged from the spray absorption tower and enters the regeneration reactor. After being treated with Fe powder at 80°C for 1.6h, the alkaline absorption liquid is regenerated, and the regenerated alkaline absorption liquid can be injected back into the spray absorption tower to continue denitrification. Wherein, the liquid-gas ratio in the spray absorption tower is 14L / m 3 . The amount of Fe powder or is 1% of the quality of the alkaline absorption liquid to be treated in the regenerative reactor; the alkaline absorption liquid is obtained by the following method: the [Co(en) 3 ]Cl 2 ...

Embodiment 3

[0025] Let the original flue gas enter from the lower part of the spray absorption tower, and [Co(en) 3 ]Cl 2 Alkaline absorption liquid is reversely contacted from bottom to top, flue gas denitrification is carried out at 60°C, and the net flue gas is discharged from the upper part of the absorption tower. When the denitrification efficiency decreases, the alkaline absorption liquid is discharged from the spray absorption tower and enters the regeneration reactor. After being treated with Zn powder at 90°C for 1 hour, the alkaline absorption liquid is regenerated, and the regenerated alkaline absorption liquid can be returned to the spray absorption tower to continue denitrification. Wherein, the liquid-gas ratio in the spray absorption tower is 20L / m 3 . The consumption of Zn powder is 1.5% of the quality of the alkaline absorption liquid to be treated in the regenerative reactor; 3 ]Cl 2 The pH of the aqueous solution was adjusted to 13.

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Abstract

The method for using ethylenediamine cobalt (II) / transition metal to perform wet-process flue gas denitration includes the steps that the alkaline solution of [Co(en)3]Cl2 is used as an absorption solution, and a leaching process is utilized to perform flue gas denitrification in an absorption tower; transition metal powder is utilized to regenerate the absorption solution in a regeneration reactor; and the like. The method can obtain high denitration efficiency (above 90%). After the denitration efficiency of the absorption solution declines, the absorption solution is treated with zinc powder or Fe powder at the temperature of 70-90 DEG C for 1-2 hours, and the denitration performance of the absorption solution can be recovered. The method has the advantages of being high in denitration efficiency, low in denitration cost, convenient to implement and the like and has wide application prospect in the field of coal-fired flue gas denitration.

Description

technical field [0001] The invention belongs to the field of electric power environmental protection, and relates to a method that can be used for flue gas denitrification in coal-fired power stations, in particular to a method for wet flue gas denitrification by using ethylenediamine cobalt (II) / transition group metals. Background technique [0002] NO is one of the main air pollutants emitted by coal-fired power plants. It is toxic and can form acid rain, which poses a great threat to human health and the ecological environment. Flue gas denitrification has always been the focus of attention in the field of power environmental protection. At present, the SCR method is mainly used for flue gas denitrification in power plants. This method has high denitrification efficiency and mature technology, but the cost of denitrification is high, and the SCR catalyst has poor adaptability to flue gas conditions (not suitable for flue gas with high sulfur and high alkali metal content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/86B01D53/56B01D53/96
CPCB01D53/56B01D53/78B01D53/8628B01D53/96B01D2251/80B01D2255/20738B01D2255/20792
Inventor 程广文姚明宇杨成龙李阳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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