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Method and device for regenerating vanadium and tungsten denitration catalyst

A denitrification catalyst and regeneration device technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of reduction, loss of active components, specific surface area, etc., to reduce regeneration costs, save applicable amount, Effect of low regenerative energy consumption

Inactive Publication Date: 2013-03-27
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The function of this technology mainly includes the restoration of active components and the dredging of pore structure, and solves the problems of loss of active components and reduction of specific surface area during the use and regeneration of vanadium and tungsten denitrification catalysts

Method used

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  • Method and device for regenerating vanadium and tungsten denitration catalyst
  • Method and device for regenerating vanadium and tungsten denitration catalyst
  • Method and device for regenerating vanadium and tungsten denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The sample is collected from a poisoned 60×60×50mm honeycomb V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Catalyst, use deionized water to wash away the floating ash on the surface of the catalyst and in the pores. Then put the washed catalyst into a low-temperature plasma regeneration reactor, add 3L regeneration liquid, and the regeneration liquid immerses the catalyst and the discharge electrode. The regeneration solution contains 4wt% ammonium metatungstate, 1wt% ammonium metavanadate, 0.5wt% ammonium molybdate, and acetic acid. Close the regenerative reactor, switch on the high-voltage pulse power supply, and discharge for 90 minutes with a discharge voltage of 25kV. After the discharge was completed, the catalyst was taken out, and dried in a drying oven at 110° C. for 3 hours. Regeneration ends.

[0033] Catalytic activity evaluation and performance test before and after catalyst regeneration: The regenerated catalyst was pulverized, ground, tabletted, and sieved, and the...

Embodiment 2

[0036] The samples were collected from several poisoned 60×60×50mm honeycomb V 2 o 5 -WO 3 (MoO 3 ) / TiO 2Catalyst, use deionized water to wash away the floating ash on the surface of the catalyst and in the pores. Then put the washed piece of catalyst into the low-temperature plasma regeneration reactor, add 3L regeneration liquid, and the regeneration liquid immerses the catalyst and the discharge electrode. The regeneration solution contains 4wt% ammonium metatungstate, 1wt% ammonium metavanadate, 0.5wt% ammonium molybdate, and acetic acid. The three poisoned catalysts were respectively discharged in the liquid-phase plasma regeneration reactor for 60min, 90min, and 120min at a discharge voltage of 25kV. After the discharge was completed, the catalyst was taken out, and dried in a drying oven at 110° C. for 3 hours. Regeneration ends.

[0037] Catalytic activity evaluation and performance test before and after catalyst regeneration: The regenerated catalyst was pulver...

Embodiment 3

[0040] The samples were collected from several poisoned 60×60×50mm honeycomb V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Catalyst, use deionized water to wash away the floating ash on the surface of the catalyst and in the pores. Then put the washed piece of catalyst into the low-temperature plasma regeneration reactor, and add 3L of three kinds of regeneration solutions respectively, and the regeneration solution immerses the catalyst and the discharge electrode.

[0041] The components of the three regeneration fluids are:

[0042] (1) 4wt% ammonium metatungstate, 1wt% ammonium metavanadate, acetic acid;

[0043] (2) Ammonium metatungstate 4wt%, ammonium metavanadate 1wt%, ammonium molybdate 0.5wt%, acetic acid;

[0044] (3) Ammonium paratungstate 4wt%, ammonium paravanadate 1wt%, ammonium molybdate 0.5wt%, acetic acid;

[0045] The poisoned catalysts were sequentially discharged and regenerated for 90 minutes in plasma regeneration reactors equipped with regeneration solutions of d...

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Abstract

The invention discloses a method and a device for regenerating a vanadium and tungsten denitration catalyst. In the method, low-temperature plasma reinforced liquid phase regeneration is adopted for denitration catalysts of the series of toxic V2O5-WO3(MoO3) / TiO2 used in actual industry. The method mainly comprises active component repair and pore canal structure recovery of the toxic V2O5-WO3(MoO3) / TiO2 catalysts. The device mainly comprises a shell, a discharge electrode, a grounding electrode and a high-voltage pulse power supply. The method and the device for regenerating the vanadium and tungsten denitration catalyst have the advantages that vanadium and tungsten and other active components lost in a use and regeneration process of the catalyst are supplemented; the pore canal structure of the catalyst is dredged, and the specific surface area is increased; the regeneration efficiency of the catalyst is high; and a regeneration process is simple in technology and low in energy consumption.

Description

technical field [0001] The invention belongs to air pollution control, in particular to a method and device for regenerating vanadium and tungsten denitrification catalysts in flue gas denitrification in coal-fired power plants. Background technique [0002] With NO x Emissions are becoming more and more serious. During the "Twelfth Five-Year Plan" period in my country, the NO x Emission control, NO x As one of the total pollutant discharge control indicators. Among various denitrification technologies, Selective Catalytic Reduction (SCR) has high denitrification efficiency and mature technology, and is the mainstream technology for flue gas denitrification at home and abroad. In the SCR denitrification technology, the catalyst is the core part (the catalyst cost accounts for 40-45% of the entire project cost), and the amount is huge. At present, domestic SCR catalyst production is in its infancy, and there are no more than 10 large-scale enterprises with SCR catalyst pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01J19/08B01D53/86B01D53/56
Inventor 陈杰
Owner HANGZHOU DIANZI UNIV
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