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Method for regenerating titanium-based vanadium-series SCR (Selective Catalytic Reduction) denitration catalyst

A technology of SCR catalyst and denitration catalyst, which is applied in the field of titanium-based vanadium-based SCR denitration catalyst regeneration, can solve problems such as the lag in catalyst regeneration and resource recovery research, and achieve the effects of easy automation and continuity, low price and low processing cost.

Inactive Publication Date: 2014-12-10
HUADIAN HIGH TECH GAOBEIDIAN ENVIRONMENTAL TECH +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, as an effective denitration catalyst, SCR catalysts are widely used. The main component is titanium-based vanadium-based catalysts. The catalyst improvement work is still in progress, but compared with the rapid increase in the use range and demand of catalysts, catalyst regeneration and resource recovery research Relatively lagging behind, only a small number of patented technologies and mature processes, with the replacement of a large number of SCR denitration catalysts, an effective and simple catalyst regeneration technology is urgently needed

Method used

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  • Method for regenerating titanium-based vanadium-series SCR (Selective Catalytic Reduction) denitration catalyst

Examples

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Effect test

Embodiment 1

[0023] Take a waste honeycomb SCR catalyst from a power plant. 90% of the pores of the catalyst are blocked, but the appearance is intact and the mechanical strength is high. First, 5MP high-pressure air was used to remove dust in the channels, and then the activity and mechanical strength of the catalyst were measured. The activity of the catalyst was 65.3% of that of the new catalyst, and the mechanical strength was 89.6%.

[0024] Add the de-ashed SCR denitrification catalyst into a solution of 10% hydrochloric acid and 0.5% hydrofluoric acid, oscillate ultrasonically for 30 minutes at a temperature of 60°C, and then soak for 10 hours. Take out the catalyst, drain the acid solution, add clean water, oscillate ultrasonically for 10 minutes, wash with clean water at room temperature twice, drain the SCR denitrification catalyst and add it to 20% ammonia solution, oscillate ultrasonically for 30 minutes, raise the temperature to 90°C and continue soaking for 4.0h, Sonicate wit...

Embodiment 2

[0028] Take a waste honeycomb SCR catalyst from a power plant. 80% of the pores of the catalyst are blocked, but the appearance is intact and the mechanical strength is high. First, 3MP high-pressure air was used to remove dust in the channels, and then the activity and mechanical strength of the catalyst were measured. The activity of the catalyst was 72% of that of the new catalyst, and the mechanical strength was 92%.

[0029] Add the SCR denitrification catalyst after ash removal to 10% hydrochloric acid solution, oscillate ultrasonically for 30 minutes at a temperature of 80°C, and then soak for 20 hours. Take out the catalyst, drain the acid solution, add water, oscillate ultrasonically for 10 minutes, wash with clean water at room temperature twice, drain the SCR denitrification catalyst, add it to 15% ammonia water and 5% ammonium carbonate solution, oscillate ultrasonically for 30 minutes, and raise the temperature to 90°C Continue soaking for 5.0h, ultrasonically sha...

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Abstract

The invention relates to a method for regenerating a titanium-based vanadium-series SCR (Selective Catalytic Reduction) denitration catalyst. The method comprises the following steps: removing dusts from the surface of the waste titanium-based vanadium-series SCR denitration catalyst through high-pressure purging and ultrasonic wave treatment; carrying out acid treatment on the dust removed catalyst and washing the catalyst subjected to acid treatment with clean water; carrying out alkali treatment on the washed catalyst and washing the catalyst subjected to alkali treatment with clean water; adding the catalyst subjected to alkali treatment into a regeneration solution, soaking in a standing manner at 20-80 DEG C for 1-10h; drying the regenerated catalyst at low temperature; carrying out heat treatment on the dried catalyst in drying equipment at 200-500 DEG C for 1-3h, thereby obtaining a regenerated SCR denitration catalyst. The method has the beneficial effects of low treatment cost, simplicity in operation, easiness in automation and continuity, low corrosion to equipment, and good regenerating method and regenerating effect.

Description

technical field [0001] The invention relates to a method for regenerating a titanium-based vanadium-based SCR denitration catalyst. Background technique [0002] Nitrogen oxides (NOx) are one of the main components of air pollutants and the main cause of acid rain. With the development of social economy and increasingly stringent environmental protection requirements, countries around the world are increasingly strengthening the control of nitrogen oxides (NOx). In my country, 70% of nitrogen oxide emissions come from coal combustion. How to effectively control NOx emissions has become the focus of attention in my country and even the world. [0003] Among many treatment methods, selective catalytic reduction (SCR) has the advantages of high efficiency, reliability, no by-products, simple system equipment and mature technology, and is currently the most widely used method in industry (accounting for 96%). In the SCR system, the catalyst is the core, usually accounting for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/04B01J38/60B01J38/66B01J23/30
Inventor 李建国赵术求赵毅齐兆树牛磊雷湘刘景槐
Owner HUADIAN HIGH TECH GAOBEIDIAN ENVIRONMENTAL TECH
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