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Method for additionally impregnating active component for regeneration of denitration catalyst

A denitrification catalyst and active component technology, which is applied in the field of selective catalytic reduction catalysts, can solve problems such as equipment corrosion, and achieve the effects of low cost, simple operation, and reduced wall thickness

Active Publication Date: 2016-06-15
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

higher SO 2 / SO 3 The conversion rate will have an adverse effect on the denitration efficiency of the denitration catalyst, and will cause corrosion of the equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The deactivated denitrification catalyst is selected from a coal-fired power plant in China after 20000 hours of V 2 o 5 -MoO 3 / TiO 2 Flat-plate denitration catalyst.

[0028] Pretreatment of the denitrification catalyst: blowing compressed air to remove the ash on the surface of the catalyst and in the pores, and then immersing the catalyst in NaOH solution at 25°C for 1h. Re-immersed in H 2 SO 4 In solution, 80°C, 0.1h. Finally, wash with deionized water three times, dry at 120°C for 4 hours, and bake at 450°C for 6 hours.

[0029] Elemental analysis was carried out on the catalyst, and the loss of active component element V was 40.2%.

[0030] After the pretreated denitration catalyst was evacuated (vacuum degree -0.1Mpa, 1h), it was immersed in toluene for 0.3h, followed by primary drying at 80°C for 0.2h. Then immerse the denitration catalyst in the mixed aqueous solution of ammonium metavanadate, ammonium heptamolybdate and thiohydroxysuccinic acid for 4 ...

Embodiment 2

[0034] The denitration catalyst used and its pretreatment steps are the same as in Example 1.

[0035] After the pretreated denitration catalyst was evacuated (vacuum degree -0.1Mpa, 1h), it was soaked in dichloromethane for 1h, and then it was dried at 30°C for 0.5h. Then the denitrification catalyst was immersed in the mixed aqueous solution of ammonium metavanadate, copper nitrate and citric acid for 8 hours, then secondary dried at 80°C for 10 hours, and calcined at 500°C for 6 hours to obtain the regenerated denitrification catalyst. Wherein the mass percent composition of citric acid in the mixed aqueous solution is 5wt%, the mass percent composition of copper nitrate is 5wt%; The amount of active component element V in the mixed aqueous solution is 95% of its loss.

[0036] The performance evaluation of the denitrification catalyst was carried out in the fixed bed reactor in the laboratory. The evaluation conditions were: the temperature was 380°C, and the flue gas surfac...

Embodiment 3

[0039] The deactivated denitrification catalyst is selected from a coal-fired power plant in China after 22000 hours of V 2 o 5 -WO 3 / TiO 2 Honeycomb denitrification catalyst.

[0040] The pretreatment method of the denitration catalyst: wash with high-pressure water to remove the dust on the surface of the catalyst and in the pores, and then impregnate the catalyst in Na 2 CO 3 In solution, 80°C, 0.1h. Re-impregnated in HNO 3 solution, 25 ° C, 1h. Finally, wash with deionized water once, dry at 120°C for 10 hours, and bake at 550°C for 4 hours.

[0041] Elemental analysis was carried out on the catalyst, and the loss of active component element V was 32.5%.

[0042] After the pretreated denitration catalyst was evacuated at room temperature (vacuum degree -0.15Mpa, 0.5h), it was impregnated with ethyl acetate for 2h, followed by primary drying at 70°C for 0.1h. Then immerse the denitration catalyst in the mixed aqueous solution of ammonium metavanadate, ammonium par...

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Abstract

The invention discloses a method for additionally impregnating an active component for the regeneration of a denitration catalyst. The method adopts two impregnation steps and comprises the following steps: firstly impregnating an inactivated denitration catalyst subjected to ash removal and chemical washing in an organic solvent insoluble in water, performing primary drying, and then re-impregnating a mixed solution containing active component elements, additive elements and a competitive absorbent. By adopting the method for additionally impregnating the active component, the active component and the additive component can be effectively loaded in ports of the denitration catalyst and can be intensively distributed at the outer layer of the denitration catalyst. By adopting the method, the denitration activity of the catalyst can be effectively restored, and the SO2 / SO3 conversion rate is inhibited.

Description

technical field [0001] The invention relates to the technical field of selective catalytic reduction catalysts, in particular to a method for supplementary impregnation of active components during regeneration of a denitration catalyst. Background technique [0002] Selective Catalytic Reduction (SCR) technology is the most widely used NOx removal technology due to its advantages of high denitrification efficiency, small footprint and reliable operation. x emission control technology. As the core of SCR denitrification technology, the denitrification catalyst will generally be deactivated after running for 24000 hours. x Emission indicators, need to replace fresh catalyst. The cost of the catalyst is relatively high, and the cost accounts for about 40% of the total investment of the denitrification project. Therefore, it is of great significance to save energy and reduce consumption in coal-fired power plants by using effective means to regenerate deactivated catalysts to...

Claims

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Application Information

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IPC IPC(8): B01J38/48B01D53/86B01D53/56
CPCB01D53/8628B01D2258/02B01J38/48B01J38/485Y02P20/30
Inventor 黄力王虎李倩王晓伟陈志平董晓真张捷
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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