Method for regenerating inactivation SCR denitration catalyst by using antitoxic renewable liquid

A denitration catalyst and regeneration liquid technology, which is applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reducing the service life of the catalyst, modifying the anti-toxicity of the catalyst, and easily poisoning the catalyst. , to achieve the effect of improving mechanical strength, good anti-toxic performance, and improving mechanical strength

Active Publication Date: 2013-03-20
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technology does not modify the anti-poison ability of the catalyst, which leads to the fact that the regenerated catalyst is still easily poisoned and deactivated during use, which reduces the service life of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of cleaning solution: Prepare a mixed solution with a mass fraction of butyl orthosilicate of 0.01% and a molar concentration of sulfuric acid of 0.1mol / L, and perform ultrasonic treatment for 10 minutes to prepare a cleaning solution.

[0035] 2. Preparation of active replenishing liquid, prepare a mixed solution with a molar concentration of 0.1mol / L ammonium metavanadate, 0.5mol / L ammonium tungstate and 0.01% polyvinyl alcohol, stir mechanically for 30min, and prepare active replenishing liquid .

[0036] 3. Preparation of anti-toxic modified solution, prepare a mixed solution with a mass fraction of 0.005% germanium nitrate, 0.005% ammonium molybdate tetrahydrate and 0.001% cerium ammonium nitrate, add a small amount of additives, stir mechanically for 30 minutes, and prepare an anti-toxic modified solution liquid.

[0037] 4. Take the deactivated catalyst from a coal-fired power plant, and blow it with oil-free dry compressed air for 10 minutes to r...

Embodiment 2

[0044] 1. Preparation of cleaning solution: Prepare a mixed solution with a mass fraction of butyl orthosilicate of 5% and a molar concentration of oxalic acid of 1mol / L, and perform ultrasonic treatment for 30 minutes to prepare a cleaning solution.

[0045]2. Preparation of active replenishing liquid, prepare a mixed solution with a molar concentration of 1mol / L ammonium metavanadate, 10mol / L ammonium tungstate and 5% polyvinyl alcohol, stir mechanically for 60min, and prepare active replenishing liquid.

[0046] 3. Preparation of anti-toxic modified solution, prepare a mixed solution with a mass fraction of 3% germanium nitrate, 3% ammonium molybdate tetrahydrate and 1% ceric ammonium nitrate, add a small amount of additives, stir mechanically for 60 minutes, and prepare an anti-toxic modified solution liquid.

[0047] 4. Take the deactivated catalyst from a coal-fired power plant, and blow it with oil-free dry compressed air for 30 minutes to remove the ash on the surface ...

Embodiment 3

[0054] 1. Preparation of cleaning solution: Prepare a mixed solution with a mass fraction of butyl orthosilicate of 2.5% and a molar concentration of acetic acid of 0.5mol / L, and perform ultrasonic treatment for 20 minutes to prepare a cleaning solution.

[0055] 2. Preparation of active replenishing liquid, prepare a mixed solution with a molar concentration of 0.5mol / L ammonium metavanadate, 5mol / L ammonium tungstate and 2.5% polyvinyl alcohol, stir mechanically for 20min, and prepare active replenishing liquid.

[0056] 3. Preparation of anti-toxic modified solution, prepare a mixed solution with a mass fraction of 1.5% germanium nitrate, 1.5% ammonium molybdate tetrahydrate and 0.5% cerium ammonium nitrate, add a small amount of additives, stir mechanically for 20 minutes, and prepare an anti-toxic modified solution liquid.

[0057] 4. Take the deactivated catalyst from a coal-fired power plant, and blow it with oil-free dry compressed air for 15 minutes to remove the dust...

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PUM

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Abstract

A method for regenerating an inactivation SCR denitration catalyst of coal-fired power plants by an antitoxic renewable liquid includes: S1 air purging the catalyst with oil-free dry compressed air for 10-30 minutes; S2 impregnating in a cleaning fluid for ultrasonic processing for 10-30 min and drying at 80-110 DEG C for 60-180 min; S3 impregnating in the antitoxic renewable liquid for 60-80 min, drying at 80-110 DEG C for 60-180 min for at least twice; S4 discharging for 30 minutes under the atmosphere of 25 ml/min oxygen under 45 kV voltage in dielectric barrier discharge reaction gas; and S5 roasting for 3-12h at 300-500 DEG C. After the regeneration, the activity of the catalyst is recovered by more than 90%, the catalyst mechanical properties and antitoxic performance are effectively improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a method for regenerating an inactivated SCR denitrification catalyst in a coal-fired power plant by using an anti-toxic regeneration solution. Background technique [0002] As a primary pollutant, nitrogen oxides are harmful to human health and can also produce a variety of secondary pollution. It is one of the important precursors for the formation of ozone and is also an important cause of regional fine particle pollution and haze. In 2011, the national nitrogen oxide emissions did not fall but rose by 5.73%. In view of the adverse impact of nitrogen oxides on the atmospheric environment and the current severe situation of nitrogen oxide emission control in thermal power plants, the country proposed the "Twelfth Five-Year Plan" nitrogen oxide emission Planning and requirements: The total emission of nitrogen oxides in key industries and key regions will be reduced by 10% compared with 2010, and the reduction control target i...

Claims

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Application Information

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IPC IPC(8): B01J23/92B01J38/00B01J38/68
Inventor 盘思伟李丽韦正乐赵宁黄碧纯
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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