Regenerative cleaning solution of denitration catalyst and regeneration method of denitration catalyst

A technology for denitrification catalysts and cleaning fluids, applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor penetration, damage to catalyst structure, and insufficient power, and achieve high stability , good water solubility

Inactive Publication Date: 2017-05-31
CHONGQING MINGZHU ENVIRONMENTAL PROTECTION ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing methods of regeneration of invalid denitrification catalysts are usually carried out by ultrasonic cleaning or pickling, but ultrasonic cleaning usually encounters the problem of insufficient power and poor penetration in the industry; while the regeneration process mainly uses acid Washing will destroy the structure of the catalyst

Method used

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  • Regenerative cleaning solution of denitration catalyst and regeneration method of denitration catalyst
  • Regenerative cleaning solution of denitration catalyst and regeneration method of denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In this example, first, the same volume of alkylphenol polyoxyethylene ether with a concentration of 0.02g / L and 2g / L of diethylenetriaminepentacarboxylic acid was mixed, and the pH value was adjusted to 4.0 by ammonia water to prepare The regeneration cleaning solution of the denitration catalyst comprising 0.01g / L of low-foaming surfactant and 1g / L of ion complexing agent.

[0049] Secondly, gather the deactivated denitrification catalysts together, use a blower or other air-blowing equipment to purge and remove dust from the deactivated denitrification catalysts, and pay attention to turning over after a period of time during the purging process to ensure deactivation All parts of the denitrification catalyst can be purged.

[0050] Afterwards, the deactivated denitration catalyst was immersed in the regenerated cleaning solution of the denitration catalyst prepared above and immersed for 2 hours under the condition of heating to 15 degrees Celsius, during which comp...

Embodiment 2

[0053] In the present embodiment, at first, the concentration of the same volume is 4g / L dodecyl sulfate and 30g / L butane tetracarboxylic acid are mixed, and the pH value is adjusted to 6.5 by ammonia water, and the preparation comprising 0.02g / L The regeneration cleaning solution of the denitrification catalyst of L low-foaming surfactant and 15g / L ion complexing agent.

[0054] Secondly, gather the deactivated denitrification catalysts together, use a blower or other air-blowing equipment to purge and remove dust from the deactivated denitrification catalysts, and pay attention to turning over after a period of time during the purging process to ensure deactivation All parts of the denitrification catalyst can be purged.

[0055] Afterwards, the deactivated denitration catalyst was immersed in the regenerated cleaning solution of the denitration catalyst prepared above and immersed for 6 hours under the condition of heating to 60 degrees Celsius, during which compressed air ...

Embodiment 3

[0058] In this example, first, the same volume of aliphatic amine alkylamine polyoxyethylene ether with a concentration of 0.1 g / L and 6 g / L of cyclopentanetetracarboxylic acid was mixed, and the pH value was adjusted to 4.5 by ammonia water to prepare The regeneration cleaning solution of the denitrification catalyst comprising 0.05g / L of low-foaming surfactant and 3g / L of ion complexing agent.

[0059] Secondly, gather the deactivated denitrification catalysts together, use a blower or other air-blowing equipment to purge and remove dust from the deactivated denitrification catalysts, and pay attention to turning over after a period of time during the purging process to ensure deactivation All parts of the denitrification catalyst can be purged.

[0060] Afterwards, the deactivated denitration catalyst was immersed in the regenerated cleaning solution of the denitration catalyst prepared above and heated to 25 degrees Celsius for 3 hours, during which compressed air was intr...

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Abstract

The invention relates to the field of catalyst regeneration, and relates to a regenerative cleaning solution of a denitration catalyst. The regenerative cleaning solution comprises 0.01-2 g/L low-foam surfactant and 1-15 g/L ion complexing agent, wherein the low-foam surfactant comprises one or more of alkylphenol polyoxyethylene ether, dodecyl sulfate, fatty amine alkylamine polyoxyethylene ether, a condensation compound of fatty alcohol and ethylene oxide, fatty alcohol polyoxyethylene ether sulfate and lauryl sulfate; and the ion complexing agent comprises polybasic carboxylic acid and/or hydroxy carboxylic acid. The regenerative cleaning solution of the denitration catalyst can effectively remove the stains on the surface of the inactive denitration catalyst so as to restore the activity of the denitration catalyst. In addition, the invention further provides a regeneration method of the denitration catalyst. The regenerative cleaning solution of the denitration catalyst is used in the method. By adoption of the method, the inactive denitration catalyst can be cleaned to restore the activity.

Description

technical field [0001] The invention relates to the field of catalyst regeneration, and in particular to a denitration catalyst regeneration cleaning solution and a denitration catalyst regeneration method. Background technique [0002] SCR denitrification technology has become the mainstream technology for power plant denitrification. The most critical part of the denitrification system is the catalyst. The cost usually accounts for a large part of the total investment of the denitrification device. As the core part of the technology, the catalyst is the core part of the technology, and the design operation life is very important. However, in actual operation, the catalyst is often lost due to dust and other harmful substances. Activity, the flue gas outlet does not meet the emission standards, ammonia escape exceeds the standard, and the catalyst needs to be replaced. However, the expensive catalyst replacement cost is also a major problem faced by the SCR system. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/48B01J38/62
CPCB01J38/48B01J38/62
Inventor 付文升罗剑渝钟峥嵘周琦甯桂彬刘伟
Owner CHONGQING MINGZHU ENVIRONMENTAL PROTECTION ENG CO LTD
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