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Reutilization method of inactivated SCR denitration catalyst

A denitration catalyst and catalyst technology, which are applied in the field of environmental protection technology and denitration catalysis, can solve the problems of a regenerated catalyst that cannot obtain low-temperature flue gas according to demand, an unsatisfactory removal effect of catalyst surface deposits, and a low catalyst activity, so as to reduce SO2 oxidation. efficiency, realize resource utilization, and improve the effect of specific surface area

Active Publication Date: 2019-10-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still unsatisfactory removal of catalyst surface deposits (alkaline earth metals, etc.), low activity of the regenerated catalyst, and catalyst SO 2 Problems such as excessive oxidation rate
[0004] And for the flexible peak shaving of coal-fired power plants, iron and steel smelting, glass manufacturing, chemical industry and other industries with low-temperature flue gas (below 300 ° C), conventional catalysts have problems such as low activity and prone to sulfur poisoning, so they cannot be applied
At present, the regenerated catalyst obtained by the conventional method of deactivated catalyst is still only suitable for conventional medium-temperature flue gas, and the regenerated catalyst suitable for low-temperature flue gas cannot be obtained according to demand

Method used

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  • Reutilization method of inactivated SCR denitration catalyst
  • Reutilization method of inactivated SCR denitration catalyst
  • Reutilization method of inactivated SCR denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The deactivated denitrification catalyst was selected from a coal-fired power plant in Southwest China after 24000 hours of V 2 o 5 -WO 3 / TiO 2 Honeycomb SCR denitrification catalyst.

[0026] 1) Deashing: Blow the catalyst with dry and clean compressed air to remove the ash on the surface of the catalyst and in the pores;

[0027] 2) cleaning: at first the catalyst after purging is put into containing 0.1wt% Pingpinga, 2wt% hydroxypropyl methylcellulose, 1wt% diammonium hydrogen phosphate, 1wt% sodium lignosulfonate, 1wt% polyacrylic acid ( Molecular weight: 3000) in the cleaning solution, bubbling and cleaning 2 times, the cleaning time is 6h / time; then the catalyst after cleaning is put into the aqueous solution containing 0.2mol / L ethylene glycol and 5mol / L sulfuric acid for heat treatment, at 60 ℃ for 24 hours; after the reaction, put the catalyst into deionized water and wash it 3 times by bubbling, and the cleaning time is 4 hours each time; the washed catal...

Embodiment 2

[0037] The deactivated denitrification catalyst is selected from a coal-fired power plant in Southwest China after 20000 hours of V 2 o 5 -WO 3 / TiO 2 Flat-plate SCR denitration catalyst.

[0038] 1) Deashing: Blow the catalyst with dry and clean compressed air to remove the ash on the surface of the catalyst and in the pores;

[0039] 2) Cleaning: first put the purged catalyst into a mixture containing 0.5wt% Pingpinga, 0.2wt% hydroxypropyl methylcellulose, 4wt% diammonium hydrogen phosphate, 4wt% sodium lignosulfonate, 0.2wt% poly In the cleaning solution of acrylic acid (molecular weight: 6000), bubbling and cleaning 2 times, the cleaning time is 5h / time; then the catalyst after cleaning is put into an aqueous solution containing 2mol / L ethylene glycol and 1mol / L sulfuric acid for heat treatment, and then React at 80°C for 6 hours; after the reaction, put the catalyst into deionized water and wash it 3 times by bubbling, and the cleaning time is 4 hours each time; the w...

Embodiment 3

[0048] The deactivated denitrification catalyst was selected from a coal-fired power plant in Southwest China after 22000 hours of V 2 o 5 -MoO 3 / TiO 2 Flat-plate SCR denitration catalyst.

[0049] 1) Deashing: Blow the catalyst with dry and clean compressed air to remove the ash on the surface of the catalyst and in the pores;

[0050] 2) Cleaning: first put the purged catalyst into a mixture containing 0.3wt% Pingpinga, 1wt% hydroxypropyl methylcellulose, 2wt% diammonium hydrogen phosphate, 3wt% sodium lignosulfonate, 0.5wt% polyacrylic acid (Molecular weight: 6000) in the cleaning solution, bubble cleaning 2 times, cleaning time 4h / time; Then the catalyst after cleaning is put into the aqueous solution that contains 1mol / L ethylene glycol and 3mol / L sulfuric acid and heat treatment, at 60 ℃ for 12 hours; after the reaction, put the catalyst into deionized water and wash it 3 times by bubbling, and the cleaning time is 3 hours each time; the washed catalyst can be dried...

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Abstract

The invention belongs to the field of environmental protection technology and denitration catalysis, and particularly relates to a reutilization method of an inactivated SCR denitration catalyst. Thereutilization method specifically comprises the following steps: soot blowing, cleaning by a cleanout fluid, reductive acid leaching, auxiliary agent loading, active component loading and the like. Bytaking the integral inactivated SCR denitration catalyst as a raw material, the low-temperature SCR denitration catalyst is obtained by carrying out in situ regeneration. The regeneration catalyst has very high catalytic activity and sulfur poisoning resistance in a temperature range of 150-300 DEG C.

Description

technical field [0001] The invention belongs to the field of environmental protection technology and denitration catalysis, and in particular relates to a method for reusing an inactivated SCR denitration catalyst. Background technique [0002] Selective catalytic reduction (SCR, selective catalytic reduction) is the most widely used flue gas nitrogen oxide removal technology, which has the advantages of high denitrification efficiency and good selectivity. NH 3 -SCR denitrification technology is to selectively reduce NOx in the flue gas to harmless nitrogen and water under the action of a catalyst, using ammonia as a reducing agent, where V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 The catalyst is currently the most commonly used commercial SCR denitration catalyst. [0003] The SCR denitrification catalyst will be deactivated when it is operated for a long time in the flue gas. The reasons for the deactivation of the catalyst include fly ash blockage, poisoning, wear and sintering....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/02B01J38/04B01J38/12B01J38/48B01J38/52B01J38/60B01J38/64B01J38/68B01J23/92B01J23/30B01J23/28B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01D2258/0283B01J23/002B01J23/28B01J23/30B01J23/92B01J38/02B01J38/04B01J38/12B01J38/48B01J38/485B01J38/52B01J38/60B01J38/64B01J38/68B01J2523/00B01J2523/47B01J2523/55B01J2523/69B01J2523/68
Inventor 陆强裴鑫琦王涵啸韩健刘吉杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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