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SCR (selective catalytic reduction) denitration catalyst regenerated liquid and preparation and regeneration methods thereof

A denitration catalyst and regeneration liquid technology, which is applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of limited effect of large particle attachments, poor biodegradability, and high toxicity. , to achieve the effect of being conducive to the sustainable development of the environment, avoiding acute toxicity and good environmental friendliness

Inactive Publication Date: 2013-03-20
CHENGDU DONGFANG KWH ENVIRONMENTAL PROTECTION CATALYSTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Both Chinese patent applications 200910031206.x and 201010598331.1 involve the preparation of regeneration liquid, but the cleaning effect of both of them mainly depends on the physical action of surfactants, and the effect on the attachment of large particles is limited, and the application of 200910031206.x uses op- The 10 ingredient is alkylphenol polyoxyethylene ether, which is an environmental hormone and has poor biodegradability. As early as 2003, the European Union has issued a directive to restrict the use of cleaning agents containing this ingredient
[0005] The active supplementary ingredients of the above-mentioned patents either use ammonium metavanadate or vanadyl sulfate, and vanadium exists in a pentavalent form, or is highly toxic or highly toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the cleaning device, use deionized water as a solvent to prepare a solution with a concentration of isomeric C13 fatty alcohol polyoxyethylene ether emulsifier of 0.05% by weight and a concentration of HF of 0.02% by weight, and mechanically stir until uniformly mixed. The above-mentioned HF is hydrogen fluoride, and the same applies to the following.

[0030] In the activity recovery device, use deionized water as a solvent to prepare a mixture of vanadium oxalate with a concentration of 3% by weight and ammonium metatungstate with a concentration of 30% by weight, and stir mechanically for 5 minutes until the mixture is uniform.

[0031] The spent catalyst with a cross-section of 150×150mm, a hole number of 18×18, and a length of 800mm was first cleaned in the cleaning device for 30 minutes, then placed in the activity recovery device for 20 minutes and then taken out. The catalyst taken out was dried with dry air for 3 hours, and the regeneration of the catalyst w...

Embodiment 2

[0034] In the cleaning device, use deionized water as a solvent to prepare a solution of isomeric C13 fatty alcohol polyoxyethylene ether emulsifier with a weight percent concentration of 1% and HF with a weight percent concentration of 0.01%, and mechanically stir until uniformly mixed.

[0035] In the activity recovery device, use deionized water as a solvent to prepare a mixture of vanadium oxalate with a concentration of 0.5% by weight and ammonium metatungstate with a concentration of 5% by weight, and stir mechanically for 5 minutes until the mixture is uniform.

[0036] The spent catalyst with a cross section of 150×150mm, a hole number of 18×18, and a length of 800mm was first cleaned in a cleaning device for 30 minutes, then placed in an activity recovery device for immersion for 20 minutes and then taken out. The catalyst taken out was dried with dry air for 3 hours, and the regeneration of the catalyst was completed.

[0037] Washing and impregnating solution volume...

Embodiment 3

[0039] In the cleaning device, use deionized water as a solvent to prepare a solution with a concentration of isomeric C13 fatty alcohol polyoxyethylene ether emulsifier of 0.25% by weight and a concentration of HF of 0.015% by weight, and mechanically stir until uniformly mixed.

[0040] In the activity recovery device, use deionized water as a solvent to prepare a mixture of vanadium oxalate with a concentration of 2% by weight and ammonium metatungstate with a concentration of 20% by weight, and stir mechanically for 5 minutes until the mixture is uniform.

[0041] The spent catalyst with a cross section of 150×150mm, a hole number of 18×18, and a length of 800mm was first cleaned in a cleaning device for 30 minutes, then placed in an activity recovery device for immersion for 20 minutes and then taken out. The catalyst taken out was dried with dry air for 3 hours, and the regeneration of the catalyst was completed.

[0042] Washing and impregnating solution volumes are at ...

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PUM

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Abstract

The invention discloses SCR (selective catalytic reduction) denitration catalyst regenerated liquid and preparation and regeneration methods thereof. The regenerated liquid comprises a cleaning component and an activity recovery component, wherein the cleaning component comprises a heterogeneous C13 fatty alcohol-polyoxyethylene ether emulsifier and HF (hydrogen fluoride), and the activity recovery component comprises vanadium oxalate and ammonium metatungstate. According to the invention, the cleaning component and the activity recovery component are respectively prepared, and catalysts are respectively cleaned and then subjected to activated regeneration. According to the invention, a dead catalyst is regenerated by using the SCR denitration catalyst regenerated liquid with double functions of cleaning and activity recovery and the regeneration method thereof; and researches prove that a regenerated catalyst is high in efficiency and low in toxicity and has good environmental friendliness, and the mechanical properties of the catalysts are not destroyed.

Description

technical field [0001] The invention relates to the field of flue gas selective catalytic reduction denitrification catalysts, in particular to a regeneration liquid used for regeneration of an exhausted SCR denitrification catalyst and a regeneration method thereof. Background technique [0002] With the stricter NOx emission control, the SCR denitrification process has been more and more widely used as the most effective denitrification method. Catalyst is the core of the process, and the cost of catalyst accounts for about 20% of the initial construction cost of the SCR system. During operation, the cost of catalyst replacement accounts for about 50% of the total system price. In actual operation, industrial catalysts will gradually age and fail over time, so the life of the catalyst determines the cost of the SCR system. The use of regeneration technology can restore the activity of the spent catalyst to 90-100% of the initial activity, prolonging the service life of th...

Claims

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Application Information

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IPC IPC(8): B01J38/68B01D53/90B01D53/56
Inventor 廖新徐斌熊丽仙陈凯艾生炳梁材
Owner CHENGDU DONGFANG KWH ENVIRONMENTAL PROTECTION CATALYSTS
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