Denitrfying agent as well as preparation method and application thereof

A denitrification agent and activated carbon technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of activated carbon such as long time, achieve the effect of improving denitrification efficiency, enhancing market competitiveness, and reducing costs

Active Publication Date: 2019-02-05
MCC BAOSTEEL TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to reduce the preparation cost of activated carbon denitration agent and improve the denitrification performance of activated carbon, the present invention utilizes alkali solution excitation and microwave heating to prepare alkali excitation technology, which solves the problem that the existing high-temperature heating active excitation activated carbon takes a long time. The denitrification agent uses C and CO As a reducing agent, it can significantly improve the denitrification efficiency, and at the same time, the weak alkali environment can further improve the denitrification efficiency, reduce costs, and develop new flue gas denitrification agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) The activated carbon was immersed in a sodium hydroxide solution with a concentration of 40wt%, the immersion temperature was 20°C, and the immersion time was 5h; then placed in a vacuum drying box with a vacuum degree of -0.07MPa and a temperature of 60°C for 45min to obtain adsorption Alkaline solution activated carbon; among them, the shape of activated carbon is Φ8mm╳12mm, and the bulk density is 0.57t / m 3 , the water content is 2.3wt%, and the mass ratio of activated carbon to sodium hydroxide solution is 40:50;

[0040] 2) put the adsorption alkali solution activated carbon into a microwave device and carry out microwave heating, wherein the microwave power is 600W, and the activation time is 15min to obtain an alkali-excited activated carbon precursor;

[0041] 3) washing the alkali-excited activated carbon precursor with a concentration of 3wt% hydrochloric acid solution to remove impurities in the alkali-excited activated carbon precursor, the mass ratio of ...

Embodiment 2

[0043] 1) The activated carbon is immersed in a potassium hydroxide solution with a concentration of 60wt%, the immersion temperature is 25°C, and the immersion time is 3h; and then placed in a vacuum drying box with a vacuum degree of -0.06MPa and a temperature of 50°C for 60min to obtain adsorption alkali Solution activated carbon; among them, the shape of activated carbon is Φ9mm╳13mm, and the bulk density is 0.62t / m 3 , the water content is 2.1wt%, and the mass ratio of activated carbon to potassium hydroxide solution is 34:60;

[0044] 2) put the adsorption alkali solution activated carbon into a microwave device and carry out microwave heating, wherein the microwave power is 200W, and the activation time is 6min to obtain an alkali-excited activated carbon precursor;

[0045] 3) using a phosphoric acid solution with a concentration of 5wt% to wash the alkali-excited activated carbon precursor to remove impurities in the alkali-excited activated carbon precursor, and the ...

Embodiment 3

[0047] 1) The activated carbon was immersed in a magnesium hydroxide solution with a concentration of 50wt%, the immersion temperature was 22°C, and the immersion time was 4h; then placed in a vacuum drying box with a vacuum degree of -0.09MPa and a temperature of 70°C for 30min to obtain adsorption Alkaline solution activated carbon; among them, the shape of the activated carbon is Φ10mm╳15mm, and the bulk density is 0.60t / m 3 , the moisture content is 2.5wt%, and the mass ratio of activated carbon to magnesium hydroxide solution is 22:70;

[0048] 2) put the activated carbon of adsorbed alkali solution into a microwave device for microwave heating, wherein the microwave power is 1000W, and the activation time is 3min, to obtain an alkali-excited activated carbon precursor;

[0049] 3) using a sulfuric acid solution with a concentration of 6wt% to wash the alkali-excited activated carbon precursor to remove impurities in the alkali-excited activated carbon precursor, and the ma...

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Abstract

The invention provides a denitrfying agent as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) adsorbing an alkaline solution with activecarbon: soaking the active carbon into the alkaline solution, then drying to obtain active carbon adsorbed with the alkaline solution; 2) performing microwave heating: performing microwave heating onthe active carbon adsorbed with the alkaline solution to obtain an alkaline stimulated active carbon precursor; and 3), performing acid pickling: washing the alkaline stimulated active carbon precursor with an acid solution, washing and drying to obtain the denitrfying agent. The alkaline stimulated active carbon is prepared by alkaline solution stimulating and microwave heating, so that the problem that time for stimulating active carbon by heating active carbon at a high temperature is long is avoided; and the denitrfying agent utilizes C and CO as a reducing agent, so that the denitration efficiency is remarkably improved; and meanwhile, a weak alkaline environment further improves the denitration efficiency, so that the cost is reduced, and a novel flue gas denitrfying agent is developed.

Description

technical field [0001] The invention relates to the technical field of sintering flue gas denitration agents, in particular to an alkali-excited activated carbon denitration agent prepared based on a microwave heating-alkali solution method, and a preparation method and application thereof. Background technique [0002] The development of flue gas denitrification technology is currently a key issue in the field of environmental pollution control. Due to the difficult characteristics of NOx removal technology, it has become a difficult point in research. [0003] At present, the traditional flue gas denitrification technology has the problems of large investment, high operation cost and limited denitration efficiency. The use of microwave heating to prepare activated carbon for denitrification has attracted widespread attention because of its high adsorption, strong reduction properties, and uniform and rapid microwave heating. Although the preparation of activated carbon de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/02B01D53/81B01D53/56
CPCB01D53/02B01D53/56B01D53/81B01D2251/20B01D2251/204B01D2253/102B01D2257/404B01J20/20B01J20/28057B01J20/3071B01J20/3078B01J20/32
Inventor 顾恒星张浩陈华韩云龙
Owner MCC BAOSTEEL TECH SERVICE
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