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Alkali metal poisoning SCR denitration catalyst recycling and reusing method

A denitration catalyst and alkali metal technology, applied in the field of environmental protection technology and denitration catalysis, can solve the problems of excessive catalyst oxidation rate, unsatisfactory removal effect of catalyst surface deposits, easy alkali metal poisoning of catalysts, etc., so as to realize resource utilization and reduce The effect of crushing and reshaping steps, optimizing the microscopic pore structure

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 deposits on the surface of the catalyst (alkaline earth metals, etc.), which are not ideally removed, and the regenerated catalyst is still prone to alkali metal poisoning, and the catalyst SO 2 Problems such as excessive oxidation rate

Method used

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  • Alkali metal poisoning SCR denitration catalyst recycling and reusing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Alkali metal poisoning denitrification catalyst is 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: first put the purged catalyst into a mixture containing 0.1wt% Pingpinga, 2wt% hydroxypropyl methylcellulose, 1wt% diammonium hydrogen phosphate, 1wt% sodium lignosulfonate, 0.6wt% polyacrylic acid (Molecular weight: 3000) in the cleaning solution, bubbling cleaning 2 times, cleaning time 4h / time; Then the catalyst after cleaning is put into the aqueous solution containing 0.2mol / L ethylene glycol and 5mol / L sulfuric acid to heat treatment, in React at 60°C 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 catalyst can be dried at 70°C for 48 hours;

[0028]3) Regeneration: first soak th...

Embodiment 2

[0038] Alkali metal poisoning denitrification catalyst is V 2 o 5 -WO 3 / TiO 2 Flat-plate SCR denitration catalyst.

[0039] 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;

[0040] 2) Cleaning: first put the purged catalyst into a mixture containing 0.5wt% Pingpinga, 0.2wt% hydroxypropyl methylcellulose, 3wt% diammonium hydrogen phosphate, 4wt% sodium lignosulfonate, 0.2wt% poly In the cleaning solution of acrylic acid (molecular weight: 6000), bubbling and cleaning 3 times, the cleaning time is 2h / time; then the catalyst after cleaning is put into the aqueous solution containing 1mol / L ethylene glycol and 1mol / L sulfuric acid for heat treatment. React at 80°C for 6 hours; after the reaction, put the catalyst into deionized water, wash it twice by bubbling, and the cleaning time is 4 hours each time; the cleaned catalyst can be dried at 90°C for 24 hours;

[0041] 3) Regeneration: first s...

Embodiment 3

[0050] Alkali metal poisoning denitrification catalyst is V 2 o 5 -MoO 3 / TiO 2 Flat-plate SCR denitration catalyst.

[0051] 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;

[0052] 2) Cleaning: first put the purged catalyst into a mixture containing 0.3wt% Pingpinga, 1wt% hydroxypropyl methylcellulose, 2wt% diammonium hydrogen phosphate, 2wt% sodium lignosulfonate, 0.4wt% polyacrylic acid (molecular weight: 5000) in the cleaning solution, bubbling cleaning 2 times, cleaning time 3h / time; Then the catalyst after cleaning is put into the aqueous solution containing 0.5mol / L ethylene glycol and 3mol / L sulfuric acid to heat treatment, in React at 70°C for 12 hours; after the reaction, put the catalyst into deionized water, wash it twice by bubbling, and the cleaning time is 3 hours each time; the cleaned catalyst can be dried at 85°C for 30 hours;

[0053] 3) Regeneration: first soak the cat...

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Abstract

The invention belongs to the field of environmental protection technologies and denitration catalysis, and particularly relates to an alkali metal poisoning SCR denitration catalyst recycling and reusing method. The method specifically comprises soot blowing, cleaning with cleaning liquid, reducing and acid leaching, alkali metal poisoning resisting auxiliary loading, active component loading andthe like. In the alkali metal poisoning SCR denitration catalyst recycling and reusing method, a one-piece alkali metal poisoning SCR denitration catalyst serving as a raw material is subjected to insitu regeneration to obtain a catalyst having alkali metal poisoning resistance. The regenerated catalyst obtained by the invention has the advantages of high denitration activity, high resistance toalkali metal poisoning, low SO2 oxidation rate and the like.

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 recycling and reusing an alkali metal poisoned SCR denitration catalyst. Background technique [0002] Among many nitrogen oxide control technologies, selective catalytic reduction (SCR, selective catalytic reduction) has high denitrification efficiency and good selectivity, and is the most widely used flue gas denitrification technology. SCR denitrification technology is to selectively reduce NOx in the flue gas to harmless nitrogen and water under the action of a catalyst and use ammonia as a reducing agent. At present, most of the commercial SCR denitration catalysts use TiO 2 as the carrier, V 2 o 5 as the active ingredient, WO 3 or MoO 3 as an auxiliary agent. [0003] SCR denitrification catalysts will be deactivated during operation, the main reasons are: (1) Catalyst poisoning caused by alkali meta...

Claims

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Application Information

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IPC IPC(8): B01J38/02B01J38/04B01J38/12B01J38/48B01J38/52B01J38/60B01J38/64B01J23/92B01J23/30B01J23/28B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01D2258/0283B01J23/002B01J23/28B01J23/30B01J23/92B01J38/02B01J38/04B01J38/12B01J38/48B01J38/485B01J38/52B01J38/60B01J38/64B01J2523/00B01J2523/47B01J2523/55B01J2523/69B01J2523/68
Inventor 杨勇平陆强吴洋文密腾阁徐明新
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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