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A solvothermal green and high-efficiency regeneration method of scr denitration catalyst for sintering flue gas failure

A denitrification catalyst and catalyst technology, applied in the field of denitrification catalysis, can solve the problem of high processing cost, achieve the effects of avoiding secondary pollution, high regeneration activity, and prolonging the service life

Active Publication Date: 2021-03-19
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the regeneration process produces a large amount of acidic wastewater, which requires secondary treatment, and the treatment cost is high

Method used

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  • A solvothermal green and high-efficiency regeneration method of scr denitration catalyst for sintering flue gas failure
  • A solvothermal green and high-efficiency regeneration method of scr denitration catalyst for sintering flue gas failure
  • A solvothermal green and high-efficiency regeneration method of scr denitration catalyst for sintering flue gas failure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The deactivated SCR denitrification catalyst was first heat-treated at 400°C and purged with high-pressure nitrogen for 1 hour to remove dust and sulfate on the surface of the catalyst; then the treated catalyst was washed with warm water at 70°C and dried at 110°C for 12 hours; The catalyst is immersed in the activity recovery solution for activity recovery. The activity recovery solution is a mixture of 0.0146g vanadyl acetylacetonate, 0.032g ammonium metatungstate, 0.054g ammonium molybdate, and 50ml water, ethanol and DMF. As a solvent (the volume ratio of water, ethanol and DMF is 1:1:1), the inactivated sample was stirred with the mixed solution for 30min, and immersed for 2h; Water heating at 180°C for 6 hours in the reaction kettle; the heat-treated catalyst solution was naturally cooled to room temperature, filtered, washed with water, and air-dried at 120°C for 12 hours; finally calcined at 500°C for 2 hours under the protection of nitrogen to obtain the regene...

Embodiment 2

[0038] The deactivated SCR denitrification catalyst was first heat-treated at 400°C and purged with high-pressure nitrogen for 1 hour to remove dust and sulfate on the surface of the catalyst; then the treated catalyst was washed with warm water at 70°C and dried at 120°C for 12 hours; The catalyst is immersed in the activity recovery solution for activity recovery. The activity recovery solution is a mixture of 0.0146g vanadyl acetylacetonate, 0.032g ammonium metatungstate, 0.054g ammonium molybdate, and 50ml water, ethanol and DMF. As a solvent (the volume ratio of water, ethanol and DMF is 1:1:1), the inactivated sample was stirred with the mixed solution for 30min, and immersed for 2h; Heat water at 160°C for 6 hours in the reaction kettle; the heat-treated catalyst solution was naturally cooled to room temperature, filtered, washed with water, and air-dried at 120°C for 12 hours; finally calcined at 500°C for 2 hours under the protection of nitrogen to obtain the regenerated...

Embodiment 3

[0040] The deactivated SCR denitrification catalyst was first heat-treated at 400°C and purged with high-pressure nitrogen for 1 hour to remove dust and sulfate on the surface of the catalyst; then the treated catalyst was washed with warm water at 70°C and dried at 110°C for 12 hours; The catalyst is immersed in the activity recovery solution for activity recovery. The activity recovery solution is a mixture of 0.0146g vanadyl acetylacetonate, 0.032g ammonium metatungstate, 0.054g ammonium molybdate, and 50ml water, ethanol and DMF. As a solvent (the volume ratio of water, ethanol and DMF is 1:1:1), the inactivated sample was stirred with the mixed solution for 30min, and immersed for 2h; Heat water at 200°C for 2 hours in the reaction kettle; the heat-treated catalyst solution was naturally cooled to room temperature, filtered, washed with water, and dried at 150°C for 8 hours; finally calcined at 500°C for 1 hour under the protection of nitrogen to obtain the regenerated cat...

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Abstract

The invention discloses a green and efficient regeneration method for solvent heat of a sintering flue gas failed SCR (Selective Catalytic Reduction) denitration catalyst. The method comprises the following steps: 1) carrying out thermal treatment, and carrying out blowing; (2) washing with water, and drying; 3) recovering activity; 4) carrying out solvent heat treatment; 5) cooling, filtering, washing, and drying; 6) calcining, wherein a solution for recovering the activity in the step 3) comprises 0.1-10wt% acetylacetone oxygen vanadium, 0.1-10wt% of ammonium metatungstate, 0.1-15wt% of ammonium molybdate and a balanced amount of a solvent; the solvent is a mixed liquid of water, ethanol and N,N-dimethyl formamide (DMF) (the volume ratio of water to ethanol to DMF) is 1:(1-5):(1-5)). Themethod has the effects that the process is simple, wastewater such as acid wastewater is not generated in a regeneration process, secondary pollution can be avoided, a deactivated catalyst is high inregeneration activity, and the service life of the catalyst can be greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of denitrification catalysis, in particular to a regeneration technology of a vanadium-titanium-based composite catalyst applied to SCR denitrification of sintered flue gas. Background technique [0002] Sintering is one of the important process units of iron and steel production, SO emissions in the sintering process 2 , NO x , Dioxin and other exhaust gas pollutants accounted for more than 85%, 40% and 90% of the total emissions of the steel industry. Sintering flue gas has a large amount of flue gas, SO 2 and NO X The emission is large, there are many coarse particles in the dust, the viscosity is strong, the flue gas temperature and emission fluctuate greatly, the moisture and oxygen content of the flue gas are high and vary greatly, and contain other toxic and harmful pollutants such as dioxin, fluoride, and heavy metals The characteristics of the ingredients. Therefore, reducing SO in the sinterin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/02B01J38/48B01J38/04B01D53/86B01D53/56
CPCB01D53/8625B01D2258/0283B01J38/02B01J38/04B01J38/48
Inventor 李小静李帮平张晓萍崔平刘英才凌强
Owner MAANSHAN IRON & STEEL CO LTD
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