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Regeneration method of deactivated SCR denitration 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 problem of not distinguishing the difference in the loading of active components, and achieve high active component content and application prospects wide effect

Inactive Publication Date: 2017-12-01
北京清树科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patents CN102059156, CN102658215, CN103846112, CN103949290, CN104138771, CN104707482, CN104801182, CN104923316 and CN105170198 all mentioned the method of active ingredient implantation, but there is no need to distinguish the difference between the surface layer and the inner layer active ingredient loading

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invalid SCR denitration catalyst in this embodiment is a vanadium-titanium honeycomb denitration catalyst, and its activity is reduced to 60% of the original activity. A method for regenerating an invalid SCR denitration catalyst specifically includes the following steps:

[0032] (1) Preparation of alkaline cleaning solution: Weigh anionic surfactant accounting for 0.01% of the total mass of alkaline cleaning solution and sodium hydroxide accounting for 3% of the total mass of alkaline cleaning solution, dissolve in deionized water, mix well, Obtain an alkaline cleaning solution;

[0033] (2) Preparation of viscous active liquid: Weigh polyethylene oxide accounting for 0.05% of the total mass of the viscous active liquid and ammonium metavanadate accounting for 5% of the total mass of the viscous active liquid, dissolve in deionized water, and mix evenly to obtain a viscous active liquid , the viscosity of the viscous active liquid is 0.01Pa·s;

[0034] (3) Pretre...

Embodiment 2

[0044] The invalid SCR denitrification catalyst in this embodiment is a vanadium-titanium plate-type denitrification catalyst, and its activity is reduced to 52% of the original activity. A method for regenerating an invalid SCR denitrification catalyst specifically includes the following steps:

[0045] (1) Preparation of alkaline cleaning solution: Weigh non-ionic surfactant accounting for 0.3% of the total mass of alkaline cleaning solution and triethanolamine accounting for 5% of the total mass of alkaline cleaning solution, dissolve in deionized water, and mix evenly. Obtain an alkaline cleaning solution;

[0046] (2) Preparation of viscous active liquid: weigh polyethylene glycol accounting for 1.2% of the total mass of the viscous active liquid, vanadyl sulfate and 3% ammonium metatungstate respectively accounting for the total mass of the viscous active liquid, and dissolve them in deionized water , mixed evenly to obtain viscous active liquid, the viscosity of viscous...

Embodiment 3

[0057] The invalid SCR denitrification catalyst in this embodiment is a rare earth honeycomb denitrification catalyst, and its activity is reduced to 45% of the original activity. A method for regenerating an invalid SCR denitrification catalyst specifically includes the following steps:

[0058] (1) Preparation of alkaline cleaning solution: Weigh non-ionic surfactants accounting for 0.6% of the total mass of alkaline cleaning solution and potassium carbonate accounting for 8% of the total mass of alkaline cleaning solution, dissolve them in deionized water, and mix evenly. Obtain an alkaline cleaning solution;

[0059] (2) Prepare viscous active liquid: weigh 2.5% of the total mass of viscous active liquid, hydroxyethyl cellulose, cerium ammonium nitrate, 5% of zirconium sulfate and 2% of ammonium paratungstate, each accounting for 6% of the total mass of viscous active liquid. Dissolve in deionized water and mix evenly to obtain a viscous active liquid, the viscosity of whi...

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Abstract

The invention discloses a regeneration method of a deactivated SCR denitration catalyst. The method includes the steps of: 1) pre-treating a SCR denitration catalyst to remove impurities on the surface; 2) soaking the catalyst in an alkaline cleaning solution to clean the catalyst with assistance of mechanical methods; 3) acid-pickling the catalyst after the alkali-washing for neutralization; 4) soaking and rinsing the acid-pickled catalyst in deionized water so as to partly dry the catalyst; 5) impregnating the dried catalyst in an active solution having viscosity; and 6) finally performing thermal treatment to the catalyst to complete regeneration. By means of the method, the regenerated catalyst is high in content of surface active components and low in content of inner-layer active components, which satisfy the demands of a SCR denitration catalyst in practical application; the activity of the regenerated catalyst is recovered to more than 95% of original activity. The regeneration method has great industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of regeneration of denitrification catalysts, in particular to a method for regeneration of spent SCR denitrification catalysts. Background technique [0002] On September 21, 2011, the country issued a new national standard GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants", which stipulates that the emission concentration limit of nitrogen oxides from thermal power boilers and gas turbines should be reduced to 100mg / m 3 . In this context, selective catalytic reduction (SCR) technology, the mainstream technology for flue gas denitrification in thermal power plants, and its key equipment denitrification catalyst industry have been greatly developed. According to statistics from the China Electricity Council, as of the end of 2014, the capacity of flue gas denitration units in thermal power plants was about 687 million kilowatts, accounting for 75.0% of the national thermal power uni...

Claims

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Application Information

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IPC IPC(8): B01J38/64B01J38/60B01J38/62
CPCB01J38/64B01J38/485B01J38/60B01J38/62
Inventor 王仁虎
Owner 北京清树科技发展有限公司
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