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Recycling method of abandoned SCR (Selective Catalytic Reduction) denitration catalyst

A denitration catalyst and catalyst technology are applied in the fields of environmental protection technology and denitration catalysis to achieve the effects of solving environmental pollution problems, simple process and strong operability

Active Publication Date: 2017-05-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the SCR system mostly adopts the "high dust" arrangement, that is, it is arranged between the economizer and the air preheater, which causes the catalyst to absorb a large amount of fly ash during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 has described a kind of recycling method of waste SCR denitration catalyst, and its specific steps include:

[0031] (1) Select the discarded vanadium-tungsten-titanium SCR denitrification catalyst from a power plant. First, it is mechanically deashed, and then it is purged with 2Mpa clean and dry compressed air for 1 hour to remove the ash on the surface of the catalyst and in the pores. Soak the purged catalyst in a sufficient amount of deionized water, and clean it with ultrasonic vibration at 45°C for 30min. Then move the catalyst to a sufficient amount of pre-prepared 0.5mol / L sulfuric acid solution for ultrasonic cleaning for 15 minutes to remove toxic substances such as alkali metals, alkaline earth metals and iron oxides bonded to the surface of the catalyst, and then put the catalyst into an oven. Dry at 100°C for 8h. Grinding the dried waste SCR denitrification catalyst to a particle size within the range of 100-200 mesh;

[0032](2) Under stirr...

Embodiment 2

[0039] Embodiment 2 also describes a kind of recycling method of waste SCR denitration catalyst, and its specific steps include:

[0040] (1) Select the discarded vanadium-tungsten-titanium SCR denitrification catalyst from a power plant. First, it is mechanically deashed, and then it is purged with 2Mpa clean and dry compressed air for 1 hour to remove the ash on the surface of the catalyst and in the pores. Soak the purged catalyst in a sufficient amount of deionized water, and clean it with ultrasonic vibration at 45°C for 30min. Then move the catalyst to a sufficient amount of pre-prepared 0.5mol / L sulfuric acid solution for ultrasonic cleaning for 15 minutes to remove toxic substances such as alkali metals, alkaline earth metals and iron oxides bonded to the surface of the catalyst, and then put the catalyst into an oven. Dry at 100°C for 8h. Grinding the dried waste SCR denitrification catalyst to a particle size within the range of 100-200 mesh;

[0041] (2) Under sti...

Embodiment 3

[0048] Embodiment 3 also describes a kind of recycling method of waste SCR denitration catalyst, and its specific steps include:

[0049] (1) Select the discarded vanadium-tungsten-titanium SCR denitrification catalyst from a power plant. First, it is mechanically deashed, and then it is purged with 2Mpa clean and dry compressed air for 1 hour to remove the ash on the surface of the catalyst and in the pores. Soak the purged catalyst in a sufficient amount of deionized water, and clean it with ultrasonic vibration at 45°C for 30min. Then move the catalyst to a sufficient amount of pre-prepared 0.5mol / L sulfuric acid solution for ultrasonic cleaning for 15 minutes to remove toxic substances such as alkali metals, alkaline earth metals and iron oxides bonded to the surface of the catalyst, and then put the catalyst into an oven. Dry at 100°C for 8h. Grinding the dried waste SCR denitrification catalyst to a particle size within the range of 100-200 mesh;

[0050] (2) Under sti...

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Abstract

The invention belongs to the field of environment protection technology and denitration catalysis, and particularly relates to a recycling method of an abandoned SCR (Selective Catalytic Reduction) denitration catalyst. The recycling method comprises the following steps: firstly carrying out soot blowing and impurity removing on the abandoned SCR denitration catalyst; then carrying out ultrasonic washing by sequentially using deionized water and an acid solution; then smashing the abandoned SCR denitration catalyst and carrying out structure adjustment; finally carrying out active loading by adopting an equivalent-volume impregnation method, and carrying out forming, drying and roasting on an obtained material, thus obtaining a recycling catalyst. The recycling method disclosed by the invention is simple in technology, has stronger operability and is suitable for large-scale production, the denitration efficiency of the recycling catalyst is up to and even exceeds the level of a fresh catalyst, and the oxidation efficiency of SO2 is controlled to the maximum; not only can waste be changed into wealth and harmfulness be changed into benefit, but also a series of potential environment pollution problems can be solved, so that considerable economic benefit and immeasurable environment benefit are obtained.

Description

technical field [0001] The invention belongs to the field of environmental protection technology and denitrification catalysis, and in particular relates to a method for recycling waste SCR denitrification catalysts. Background technique [0002] Selective Catalytic Reduction (SCR) method, as the most mature denitrification technology at present, is widely used in the process of nitrogen oxide (NOx) emission control in industries such as coal-fired power plants, and its core part is the catalyst. In the actual use process, the working environment of the catalyst is very harsh. Affected by multiple factors, the catalyst is gradually deactivated due to surface active site coverage, loss or irreversible chemical changes, resulting in a significant decline in catalytic efficiency. 2 The oxidation rate increases significantly. When the catalyst cannot meet the overall denitrification performance requirements of the SCR system, it needs to be discarded according to relevant regula...

Claims

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Application Information

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IPC IPC(8): B01J38/60
CPCB01J38/60
Inventor 陆强唐昊李慧杨江毅李文艳杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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