Arsenic poisoning SCR (selective catalytic reduction) denitration catalyst regeneration method

A denitration catalyst, arsenic poisoning technology, applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc. The probability, conversion rate will not increase, the effect of restoring denitration activity

Active Publication Date: 2017-05-31
COUNTRY JIANGSU CATALYST REGENERATION TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Treating the deactivated SCR denitrification catalyst with strong acid and strong alkali will damage the mechanical strength of the regenerated catalyst and reduce the service life of the SCR denitrification catalyst; when sodium salt or calcium nitrate is used to clean the As poisoned catalyst, the cleaning solution introduces new substances to the surface of the catalyst. Toxic components-sodium ions, calc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] A method for regenerating an arsenic poisoning SCR denitration catalyst, characterized in that: comprising the following steps:

[0028] Step 1: Physical purification, clean the catalyst by physical means, remove dust on the surface of the catalyst and dredge the pores; physical means include air purging and jet cleaning, and air purging includes compressed air purging or negative pressure vacuuming , but not limited to the above two ways, other ways of utilizing air to remove dust can be used in the present invention, the time of air purging is 15 minutes, jet cleaning includes the combination of jet cleaning and bubbling cleaning, and the blocked catalyst channels are Dredge, jet pressure is 0.45Mpa; bubbling pressure is 0.5Mpa,

[0029] Step 2: chemical cleaning, the catalyst after the physical purification is chemically cleaned, the chemical cleaning uses a neutral cleaning solution, and the neutral cleaning solution contains persulfate, organic carboxylate, surfact...

Embodiment approach 2

[0034] A method for regenerating an arsenic poisoning SCR denitration catalyst, characterized in that: comprising the following steps:

[0035] Step 1: Physical purification, clean the catalyst by physical means, remove dust on the surface of the catalyst and dredge the pores; physical means include air purging and jet cleaning, and air purging includes compressed air purging or negative pressure vacuuming , but not limited to the above two ways, other ways of utilizing air to remove dust can be used in the present invention, the time of air purging is 15 minutes, jet cleaning includes the combination of jet cleaning and bubbling cleaning, and the blocked catalyst channels are Dredge, jet pressure is 0.45Mpa; bubbling pressure is 0.5Mpa,

[0036] Step 2: chemical cleaning, the catalyst after the physical purification is chemically cleaned, the chemical cleaning uses a neutral cleaning solution, and the neutral cleaning solution contains persulfate, organic carboxylate, surfact...

Embodiment approach 3

[0041] A method for regenerating an arsenic poisoning SCR denitration catalyst, characterized in that: comprising the following steps:

[0042] Step 1: Physical purification, clean the catalyst by physical means, remove dust on the surface of the catalyst and dredge the pores; physical means include air purging and jet cleaning, and air purging includes compressed air purging or negative pressure vacuuming , but not limited to the above two ways, other ways of utilizing air to remove dust can be used in the present invention, the time of air purging is 15 minutes, jet cleaning includes the combination of jet cleaning and bubbling cleaning, and the blocked catalyst channels are Dredge, jet pressure is 0.45Mpa; bubbling pressure is 0.5Mpa,

[0043] Step 2: chemical cleaning, the catalyst after the physical purification is chemically cleaned, the chemical cleaning uses a neutral cleaning solution, and the neutral cleaning solution contains persulfate, organic carboxylate, surfact...

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PUM

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Abstract

The invention relates to an arsenic poisoning SCR (selective catalytic reduction) denitration catalyst regeneration method and in particular discloses a catalyst cleaning process for efficiently removing arsenic by using cleanout fluid with a neutral pH value. The invention aims to provide the arsenic poisoning SCR denitration catalyst regeneration method. The arsenic on the surface of an SCR denitration catalyst is removed to the greatest degree under the condition that the pH value is neutral, the original mechanical strength of the catalyst is not reduced, losses of active ingredients of the cleaned SCR denitration catalyst can be reduced as much as possible, and a certain amount of anti-poisoning aids are implanted, so that the catalyst has a certain arsenic poisoning resistance.

Description

technical field [0001] The invention relates to a method for regenerating an As-poisoned SCR denitrification catalyst, in particular to a catalyst cleaning process for efficiently removing arsenic with a cleaning solution with a neutral pH. Background technique [0002] SCR denitrification technology has a remarkable effect on boiler flue gas NOx control, and the technology is mature. It has become one of the most widely used and most effective flue gas denitrification technologies in the world. In recent years, my country's SCR denitrification project has developed rapidly, and its application in coal-fired power plants has become more popular, and the market loading of denitrification catalysts has also increased year by year. However, since the chemical life of the catalyst is usually 16,000-24,000 hours, it brings a greater pressure on the disposal of the deactivated catalyst. At present, there has been a demand for the replacement of the deactivated SCR denitrification ...

Claims

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Application Information

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IPC IPC(8): B01J23/92B01J38/48B01D53/86B01D53/56
Inventor 史伟伟吴凡李晓刚许兆鹏孙希德崔立业
Owner COUNTRY JIANGSU CATALYST REGENERATION TECH
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