Regeneration method of SCR (selective catalytic reduction) catalyst

A kind of SCR catalyst and catalyst technology, applied in the direction of chemical instruments and methods, separation methods, adipic acid production, etc., can solve the problem of affecting catalyst activity recovery, poor cleaning effect of alkaline and alkaline earth metals, unfavorable uniform loading of active components, etc. problems, to achieve the effect of saving dosage, high recovery rate and reducing the loss of active substances

Active Publication Date: 2015-04-29
CHINA HUADIAN ENG +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The publication number is CN103878035A, and the Chinese invention patent titled "a regeneration liquid for a vanadium and titanium-based selective catalytic reduction denitrification catalyst" discloses that the cleaning liquid has a good effect on the treatment of catalysts poisoned by alkaline earth metals and iron salts. effect, but its cleaning solution is alkaline, from the principle of analysis, its cleaning effect on

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 A kind of regeneration method of SCR catalyst, specifically as follows:

[0036] Using the deactivated catalyst of a denitrification catalyst in a power plant after 3 years of operation, the denitrification efficiency is 60%, and the SO 2 converted to SO 3The oxidation rate is 0.47%. After physical and mechanical ash removal, soak in deionized water at 50°C for 30 minutes to remove ash deposits in the micropores; 3wt% sodium dodecylbenzenesulfonate solution with a concentration of 0.1wt%, soaked at 50°C for 20min; The concentration of sodium benzenesulfonate is 0.1wt% solution, soaking at 50°C for 30min. After cleaning, immerse in the deionized water prepared by the concentration of ammonium metavanadate of 0.5wt%, the concentration of ammonium paratungstate is 5wt%, the concentration of ammonium paramolybdate is 3wt%, the concentration of oxalic acid is 5.5wt% in the activation solution Active material loading was carried out for 10 min.

[0037] The ...

Embodiment 2

[0038] Embodiment 2 A kind of regeneration method of SCR catalyst, specifically as follows:

[0039] The deactivated catalyst after 4 years of denitrification catalyst in a power plant has a denitrification efficiency of 68%, SO 2 converted to SO 3 The oxidation rate is 0.42%. After physical and mechanical ash removal, soak in deionized water at 80°C for 30 minutes to remove ash deposits in the micropores; then immerse in deionized water prepared by sodium diamine tetraacetate 2wt%, sodium carbonate concentration of 0.2wt %, sodium dodecylbenzenesulfonate concentration of 0.05wt% solution, soaked at 80 ℃ for 40min; finally immersed in adipic acid prepared by deionized water concentration of 5wt%, dodecylbenzenesulfonate Sodium acid concentration is 0.05wt% solution, soaked at 80 ℃ for 40min. After the cleaning is completed, immerse in an activation solution prepared by deionized water with a concentration of 0.8wt% ammonium metavanadate, 3wt% ammonium paratungstate, 4wt% am...

Embodiment 3

[0041] Embodiment 3 A kind of regeneration method of SCR catalyst, specifically as follows:

[0042] The deactivated catalyst of a denitrification catalyst in a power plant after 3 years of operation has a denitrification efficiency of 58%, SO 2 converted to SO 3 The oxidation rate is 0.38%. After physical and mechanical ash removal, soak in deionized water at 60°C for 30 minutes to remove ash deposits in the micropores; 5wt% sodium dodecylbenzenesulfonate solution with a concentration of 0.2wt%, soaking at 60°C for 20min; Concentration of 0.2wt% solution, soaking at 60°C for 20min. After cleaning, immerse in the deionized water prepared by the concentration of ammonium metavanadate 2wt%, the concentration of ammonium paratungstate is 3.9wt%, the concentration of ammonium paramolybdate is 0.1wt%, the concentration of oxalic acid is 5wt% in the activation solution Carry out active material loading for 20min.

[0043] The results showed that the denitrification activity rec...

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Abstract

The invention discloses a regeneration method of an SCR (selective catalytic reduction) catalyst. According to the method, the catalyst is cleaned through two steps and is loaded with active components after complete cleaning, blocking materials are more thoroughly cleaned, and the active components are more uniformly loaded. An adopted cleaning fluid formula belongs to a low-toxic or even non-toxic material, so that environmental pollution is reduced; a weak acidic or weak basic solution is adopted, and loss of the active components in the catalyst is avoided in a cleaning process, and the method further has the characteristics of high pertinence and high efficiency. The activity of the catalyst cleaned in a separated manner recovers to higher than 95% of the activity of a fresh catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, and in particular relates to a regeneration method of an SCR catalyst. Background technique [0002] On July 29, 2011, the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine jointly issued a new national emission standard GB13223-2011 "Emission Standard of Air Pollutants for Thermal Power Plants", requiring the thermal power industry to increase investment in environmental protection. According to estimates, during the 12th Five-Year Plan period, the capacity of existing units and new units that need to be modified to remove nitrogen oxides is about 817 million kilowatts, which will bring a huge catalyst market. Catalysts are dusty arrangements and fail due to micropore clogging during long-term operation. If the catalyst is directly replaced with a fresh catalyst, the cost will increase greatly, and the catalyst re...

Claims

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Application Information

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IPC IPC(8): B01D53/96B01D53/90B01D53/56
CPCY02P20/30
Inventor 李苇林苏军划孙路长胡永锋李伟沈煜晖
Owner CHINA HUADIAN ENG
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