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A kind of regeneration method of deactivated SCR denitrification catalyst

A denitrification catalyst and catalyst technology, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor catalyst activity and anti-toxic performance, easy deactivation again, and complicated treatment. Achieve good stability, promote activity and prolong service life

Active Publication Date: 2014-10-22
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have achieved a certain effect on SCR catalyst regeneration, but there are still problems such as poor activity and anti-toxicity of the regenerated catalyst, easy to deactivate again, and complicated treatment. Therefore, it is necessary to further develop and research related technical methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of regeneration solution: prepare the regeneration solution containing 0.1mol / L of sulfuric acid, 0.1mol / L of ferric nitrate and 0.1mol / L of cerium nitrate, and add a small amount of oxalic acid, citric acid and diffusing agent. Vibrate ultrasonically for 20 minutes to form a homogeneous mixture.

[0026] (2) Preparation of anti-toxic modification liquid: prepare zinc nitrate 0.1mol / L, antimony acetate 0.5mol / L, niobium oxalate 0.5mol / L, add a small amount of methanol and diffusing agent, and use ultrasonic vibration for 20min to make it Mix well.

[0027] (3) Take a deactivated catalyst from a coal-fired power plant and cut it into a piece of 2.1×2.1×20 (cm), and blow it with oil-free compressed air (0.6MPa) for 30 minutes.

[0028] (4) Immerse the above-mentioned catalyst in the regeneration solution for 3 hours, vibrate with ultrasonic waves, and then put it into a drying oven for 2 hours at 110°C.

[0029] (5) Immerse the above-mentioned dry cataly...

Embodiment 2

[0032] (1) Preparation of regeneration solution: prepare regeneration solution containing 0.1mol / L of sulfuric acid, 0.5mol / L of ferric nitrate and 0.5mol / L of cerium nitrate, and add a small amount of oxalic acid, citric acid and diffusing agent. Vibrate ultrasonically for 20 minutes to form a homogeneous mixture.

[0033] (2) Preparation of anti-toxic modification liquid: prepare zinc nitrate 0.1mol / L, antimony acetate 0.5mol / L, niobium oxalate 0.5mol / L, add a small amount of methanol and diffusing agent, and use ultrasonic vibration for 20min to make it Mix well.

[0034] (3) Take a deactivated catalyst from a coal-fired power plant and cut it into a piece of 2.1×2.1×20 (cm), and blow it with oil-free compressed air (0.6MPa) for 30 minutes.

[0035] (4) Immerse the above-mentioned catalyst in the regeneration solution for 3 hours, vibrate with ultrasonic waves, and then put it into a drying oven for 2 hours at 110°C.

[0036] (5) Immerse the above-mentioned dry catalyst i...

Embodiment 3

[0039] (1) Preparation of regeneration solution: Prepare regeneration solution containing 0.1mol / L of sulfuric acid, 1mol / L of ferric nitrate and 1 mol / L of cerium nitrate, and add a small amount of oxalic acid, citric acid and diffusing agent. Vibrate ultrasonically for 20 minutes to form a homogeneous mixture.

[0040] (2) Preparation of anti-toxic modification liquid: prepare zinc nitrate 0.1mol / L, antimony acetate 0.5mol / L, niobium oxalate 0.5mol / L, add a small amount of methanol and diffusing agent, and use ultrasonic vibration for 20min to make it Mix well.

[0041] (3) Take a deactivated catalyst from a coal-fired power plant and cut it into a piece of 2.1×2.1×20 (cm), and blow it with oil-free compressed air (0.6MPa) for 30 minutes.

[0042] (4) Immerse the above catalyst in the regenerated solution for 3 hours, vibrate with ultrasonic waves, and then put it into a drying oven for 2 hours at 110°C.

[0043] (5) Immerse the above-mentioned dried catalyst in the anti-t...

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Abstract

A deactivated SCR denitration catalyst regeneration method includes: (1) preparing a reproduction solution including a cleaning liquid and an activity replenisher; (2) preparing an antitoxic modified liquid; (3) purging the catalyst with oil-free compressed air for 30-60 min; (4) immersing the catalyst processed by (3) in a regenerated liquid for 3-5 h accompanied with ultrasonic oscillation, and then drying at 80-110 DEG C for 2h; (5) immersing in an antitoxic modified liquid for 3-5 h accompanied by the ultrasonic oscillation, and then drying at 80-110 DEG C for 2h; (6) conducting oxygen plasma modification in a dielectric barrier reactor to get the regenerated catalyst, wherein the discharge voltage is 5-10kV, and the processing time is 15-30min. The method can remove the poison and replenish active ingredients, and the regenerated addition components are environmental-friendly, low in price, and good in anti-drug performance. The addition of oxygen plasma greatly improves activity and stability of the catalyst.

Description

technical field [0001] The invention relates to a regeneration method for catalyst deactivation, in particular to a regeneration method suitable for deactivation of SCR denitration catalysts in coal-fired power plants. Background technique [0002] Nitrogen oxides, as one of the main air pollutants, have attracted widespread attention due to acid rain, light pollution, global warming and reduction of the ozone layer. Coal-fired power plants are my country's NO X The most important source of emissions. In 2010, the total installed capacity of power generation in the country exceeded 818 million kilowatts, and it is expected to reach 1.186 billion kilowatts by 2020. Although the setting of my country's future energy structure will try to control the proportion of coal within a certain range, which will slow down the development of thermal power generation in the future, it will not change the power structure of coal-fired units in my country for a considerable period of time....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/94B01J38/00B01J38/68
Inventor 盘思伟汤龙华韦正乐李丽赵宁黄碧纯
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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