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Regeneration method of arsenic/phosphorus-poisoned selective catalytic reduction denitrification catalyst

A denitration catalyst, phosphorus poisoning technology, applied in catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc. The effect of cleaning efficiency

Inactive Publication Date: 2014-06-25
北京宏庚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former uses the alternating action of strong acid and strong alkali to deal with arsenic, which will damage the strength of the regenerated catalyst and reduce the service life; in addition, its regeneration process is relatively complicated, which increases the cost of industrial production and produces a large amount of waste liquid pollution. surroundings
The latter only uses strong alkali in the treatment of phosphorus poisoned catalysts, and there is no research on acidification and active substance supplementation. Although this method has a good effect on phosphorus treatment, the strength damage is also large, and it is difficult to obtain high denitrification active

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Solution preparation

[0026] Cleaning solution: 0.8mol / L sodium carbonate, 0.3wt% Pingping plus O;

[0027] Regeneration solution: 1mol / L ammonium chloride, 0.6wt% oxalic acid, 2wt% ammonium metavanadate, 4wt% ammonium molybdate.

[0028] (2) Process flow

[0029] The sample taken was a vanadium-tungsten-titanium denitrification catalyst that had been in operation for 23,000 hours in a power plant. It was found that the denitrification rate was 53%, and the cause of deactivation was severe arsenic poisoning. First, use 3Mpa, flow 0.5m 3 / s compressed gas to purge the arsenic-poisoned denitrification catalyst module for 10 minutes; secondly, put the purged catalyst into the cleaning solution for ultrasonic cleaning for 30 minutes, and rinse with deionized water; then, impregnate the treated catalyst in the regeneration solution for 3 hours; finally, the catalyst was dried with hot air at 120°C for 2 hours. The SCR denitration catalyst regeneration process is ove...

Embodiment 2

[0032] (1) Solution preparation

[0033] Cleaning solution: 0.5mol / L sodium carbonate, 0.3wt% Pingping plus O;

[0034] Regeneration solution: 1mol / L ammonium chloride, 0.6wt% oxalic acid, 2wt% ammonium metavanadate, 4wt% ammonium molybdate.

[0035] (2) Process flow

[0036] The sample taken was a vanadium-tungsten-titanium denitrification catalyst that had been in operation for 23,000 hours in a power plant. It was found that the denitrification rate was 53%, and the cause of deactivation was severe arsenic poisoning. First, use 3Mpa, flow 0.5m 3 / s compressed gas to purge the arsenic-poisoned denitrification catalyst module for 10 minutes; secondly, put the purged catalyst into the cleaning solution for ultrasonic cleaning for 30 minutes, and rinse with deionized water; then, impregnate the treated catalyst in the regeneration solution for 3 hours; finally, the catalyst was dried with hot air at 120°C for 2 hours. The SCR denitration catalyst regeneration process is ove...

Embodiment 3

[0039] (1) Solution preparation

[0040] Cleaning solution: 0.8mol / L sodium acetate, 0.3wt% microporous penetrant JFC;

[0041] Regeneration solution: 1mol / L ammonium chloride, 1wt% acetic acid, 2wt% ammonium metavanadate, 4wt% ammonium molybdate.

[0042] (2) Process flow

[0043] The sample taken was a vanadium-tungsten-titanium denitrification catalyst that had been in operation for 23,000 hours in a power plant. It was found that the denitrification rate was 53%, and the cause of deactivation was severe arsenic poisoning. First, use 3Mpa, flow 0.5m 3 / s compressed gas to purge the arsenic-poisoned denitrification catalyst module for 10 minutes; secondly, put the purged catalyst into the cleaning solution for ultrasonic cleaning for 30 minutes, and rinse with deionized water; then, impregnate the treated catalyst in the regeneration solution for 3 hours; finally, the catalyst was dried with hot air at 120°C for 2 hours. The SCR denitration catalyst regeneration process ...

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Abstract

The invention discloses a regeneration method of arsenic / phosphorus-poisoned selective catalytic reducing denitrification catalyst. The method comprises the following steps of mechanically clearing ash, washing by adopting the alkaline washing liquid, immersing by adopting a regeneration liquid and drying, wherein the alkaline washing liquid is a mixed solution of strong-alkali weak-acid salt and surface active agent and the acid regeneration liquid consists of ammonium salt, weak acid, ammonium metavanadate and ammonium molybdate. The arsenic / phosphorus-poisoned selective catalytic reducing denitrification catalyst is regenerated by adopting the method, the arsenic and phosphorus can be basically removed of the catalyst, the catalyst has a certain arsenic poisoning resistance, the denitrification rate can reach 81 to 88 percent, and the pressure-resisting strength and the abrasive strength of the catalyst can be maintained; in addition, the regeneration process flow is simple, the processing efficiency is high, and the regeneration method is applicable to the industrial mass production.

Description

technical field [0001] The invention relates to the field of selective catalytic reduction (SCR) denitration catalysts, in particular to a regeneration method for selective catalytic reduction denitration catalysts poisoned by arsenic and phosphorus. Background technique [0002] Nitrogen oxides are one of the main air pollutants, and coal-fired power plants are one of the main emission sources of nitrogen oxides. With the promulgation and implementation of a series of environmental protection policies in my country, SCR flue gas denitrification technology is gradually being applied to coal-fired power plants in my country. By the end of 2012, the total capacity of flue gas denitrification units in thermal power plants had exceeded 230 million kW, accounting for 28% of the capacity of active thermal power units in the country, an increase of 10% over 2011; 1.3 times the total amount in the first two years of the "Twelfth Five-Year Plan". The activity of the SCR denitrifica...

Claims

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Application Information

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IPC IPC(8): B01J38/64B01J38/66B01D53/90B01D53/56
Inventor 代永强王朋洪挺侯娜娜
Owner 北京宏庚环保科技有限公司
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