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Regeneration method for alkali metal poisoned denitration catalyst

A technology for denitrification catalysts and alkali metals, applied in the field of regeneration of alkali metal poisoned denitrification catalysts, can solve the problems of long cleaning time, complicated operation, high loss rate of active components, etc., achieve short regeneration time, simple chemical composition, and reduce recycling effect of difficulty

Inactive Publication Date: 2016-12-07
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as complicated operation, long cleaning time, and high loss rate of active components.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The deactivated denitrification catalyst was selected from a coal-fired power plant in China after 24000 hours of V 2 o 5 -WO 3 / TiO 2 The honeycomb denitrification catalyst uses compressed air to blow off the dust on the surface of the catalyst and in the pores.

[0026] Prepare an aqueous ammonium chloride solution with a concentration of 10 wt%, and impregnate the denitration catalyst after ash removal in it. Then the mixed solution was transferred to a microwave reactor, microwaved at 90°C for 15 minutes, filtered, dried, and calcined at 550°C for 2 hours in an air atmosphere to obtain a regenerated denitration catalyst. Among them, the liquid-solid ratio (mL / g) of the ammonium chloride aqueous solution to the denitration catalyst is 20:1, and the output power of the microwave reactor is 500W.

[0027] Regeneration results: After regeneration, the K element on the denitration catalyst is reduced by 99.5%, the Na element is reduced by 99.1%, the Ca element is red...

Embodiment 2

[0029] The deactivated denitrification catalyst is selected from a coal-fired power plant in China after 18000 hours of V 2 o 5 -WO 3 / TiO 2 The corrugated plate denitration catalyst is first blown with compressed air, and then vacuumed with negative pressure to remove the dust on the surface of the catalyst and in the pores.

[0030] An aqueous ammonium fluoride solution with a concentration of 5 wt% was prepared, and the denitration catalyst after ash removal was impregnated in it. Then the mixed solution was transferred to a microwave reactor, microwaved at 80°C for 20 minutes, then filtered, dried, and calcined at 500°C for 4 hours in an air atmosphere to obtain a regenerated denitration catalyst. Among them, the liquid-solid ratio (mL / g) of the ammonium fluoride aqueous solution to the denitration catalyst is 25:1, and the output power of the microwave reactor is 900W.

[0031] Regeneration results: After regeneration, the K element on the denitration catalyst decreas...

Embodiment 3

[0033] The deactivated denitrification catalyst is selected from a coal-fired power plant in China after 22000 hours of V 2 o 5 -MoO 3 / TiO 2 Plate-type denitrification catalyst, wash with high-pressure water to remove dust on the surface of the catalyst and in the pores. The plate catalyst after deashing is then separated from the paste and the steel mesh.

[0034] Prepare an aqueous ammonium sulfate solution with a concentration of 20 wt%, and impregnate the denitration catalyst paste after de-ashing in it. Then the mixed solution was transferred to a microwave reactor, microwaved at 60°C for 5 min, then filtered, dried, and calcined at 600°C for 1.5 h in an air atmosphere to obtain a regenerated denitration catalyst. Among them, the liquid-solid ratio (mL / g) of the ammonium sulfate aqueous solution to the denitration catalyst is 4:1, and the output power of the microwave reactor is 300W.

[0035] Regeneration results: After regeneration, the K element on the denitratio...

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Abstract

The invention discloses a regeneration method for an alkali metal poisoned denitration catalyst. After ash removal is carried out, the alkali metal poisoned denitration catalyst is dipped in an ammonium salt aqueous solution; and then a mixed solution is transferred to a microwave reactor to carry out microwave treatment, and filtered, dried and roasted to obtain a regenerated denitration catalyst. The regeneration method for the alkali metal poisoned denitration catalyst disclosed by the invention is simple to operate, short in processing time and better in removal effect for alkali metals on the surface of an inactivated denitration catalyst, and further can remove most of calcium compounds on the catalyst. Furthermore, active components of the denitration catalyst are not lost greatly in the regenerative process.

Description

technical field [0001] The invention relates to the technical field of selective catalytic reduction catalysts, in particular to a regeneration method for an alkali metal poisoned denitrification 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 restore their denitrification ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/48B01J23/92
CPCB01J38/485B01J23/92
Inventor 黄力王虎李倩王晓伟纵宇浩陈志平董晓真张捷
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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