Regeneration fluid for SCR denitration catalyst

A technology of denitrification catalyst and regeneration solution, which is applied in the direction of catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of expensive catalysts and achieve the effect of improving cleaning ability and catalyst activity

Inactive Publication Date: 2009-11-11
COUNTRY JIANGSU CATALYST REGENERATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts are expensive in flue gas desulfurization projects, occupy a large share of investment costs, and are consumables. For example, the average annual waste of catalysts for a 700MW unit is about 100m 3 , at the same time, the catalyst replaced due to the decrease in activity due to the V 2 o 5 , heavy metals and other substances are hazardous and must be recycled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Take penetration enhancer JFC accounting for 1wt‰ of the total weight, surfactant OP-10 accounting for 1wt‰ of the weight, dissolve in deionized water and stir for 2 minutes until uniform, prepare solution A; take ammonium metavanadate accounting for the total Dissolve 1wt%, ammonium paratungstate 6wt%, and ammonium paramolybdate 2wt% in solution A, stir mechanically for 30 minutes to mix evenly, and prepare solution B; add oxalic acid to solution B, adjust the pH value to 5, and stir mechanically for 3 minutes , make it mix evenly, place and age for 2h, and make the catalyst regeneration solution;

[0014] 2. Take a vanadium-based honeycomb catalyst detection block (150×150×1000) from a factory whose catalytic efficiency has dropped from 90% to 35%, and blow it with oil-free dry compressed air (0.6MPa);

[0015] 3. Immerse the purged catalyst detection block in 100,000g regeneration solution, take it out after immersion for 5 hours, dry it with dry air at 55°C for 2...

Embodiment 2

[0020] 1. Take 3wt‰ of the penetration enhancer JFC, 5wt‰ of the total weight of the surfactant OP-10, and 5wt‰ of the weight of Pingpingjia, dissolve in deionized water and stir for 5 minutes until uniform, and prepare solution A; Ammonium metavanadate accounted for 3wt% of the total, ammonium paratungstate 9wt%, ammonium paramolybdate 4wt% were dissolved in solution A, mechanically stirred for 30 minutes to make it evenly mixed, and prepared solution B; add acetic acid to solution B to adjust the pH value to 6, and mechanically stirred for 7 minutes to make it evenly mixed, and left to age for 4 hours to obtain a catalyst regeneration solution.

[0021] 2. Take a vanadium-based honeycomb catalyst detection block (150×150×1000) from a factory whose catalytic efficiency has dropped from 90% to 35%, and blow it with oil-free dry compressed air (0.6MPa);

[0022] 3. Immerse the purged catalyst detection block in 100,000g regeneration solution, take it out after immersion for 5 h...

Embodiment 3

[0027] 1. Take 5wt‰ of penetration enhancer JFC, 2wt‰ of surfactant OP-10, and 3wt‰ of Pingpingjia, dissolve in deionized water and stir for 4 minutes until uniform, and prepare solution A; take Ammonium metavanadate accounted for 4wt% of the total, ammonium paratungstate 12wt%, ammonium paramolybdate 6wt% were dissolved in solution A, mechanically stirred for 60 minutes to mix evenly, and prepared solution B; add citric acid to solution B to adjust pH value to 7, and mechanically stirred for 10 minutes to make it evenly mixed, and left to age for 5 hours to obtain a catalyst regeneration solution.

[0028] 2. Take a vanadium-based honeycomb catalyst detection block (150×150×1000) from a factory whose catalytic efficiency has dropped from 90% to 35%, and blow it with oil-free dry compressed air (0.6MPa);

[0029] 3. Immerse the purged catalyst detection block in 100,000g regeneration solution, take it out after immersion for 5 hours, dry it with dry air at 55°C for 2 hours, pu...

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PUM

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Abstract

The invention discloses a regeneration fluid for an SCR denitration catalyst, which comprises the following components: 0.001 to 1 weight percent of penetration enhancer JFC, 0.001 to 1 weight percent of surfactant OP-10, 0 to 1 weight percent of peregal, 0.6 to 4 weight percent of ammonium metavanadate, 5.5 to 12.5 weight percent of ammonium paratungstate, 0 to 6.5 weight percent of ammonium paramolybdate, and the balance of deionized water and acid. The regeneration fluid has the advantages that the regeneration fluid can also supplement active ingredients during the washing, and the activity recovery of the catalyst after the regeneration is up to between 90 and 105 percent; a nonionic surfactant is added into the regeneration fluid, so that the regeneration fluid improves the cleaning capability on the catalyst and cannot cause the damage to a catalyst carrier and other effective ingredients; and the regenerated catalyst fully can continue to be normally used, and the service life can reach more than 95 percent of that of a new catalyst.

Description

technical field [0001] The invention relates to a catalyst regeneration liquid, in particular to a catalyst regeneration liquid for SCR denitrification of flue gas in a power plant. Background technique [0002] The Selective Catalytic Reduction (SCR) process is used in more than 90% of thermal power plant flue gas denitrification in the world, so the SCR process is widely used. The key to the implementation of this process is catalytic technology, among which the catalyst containing vanadium pentoxide is the most widely used. According to statistics, as of 2007, the total installed capacity of the country has reached 270 million kilowatts. By 2010, there will be at least 200 million kilowatts of domestic The unit capacity needs to build a denitrification system, and a 300MW unit generally needs 200m 3 Catalyst, so the catalyst market is huge. Catalysts are expensive in flue gas desulfurization projects, occupy a large share of investment costs, and are consumables. For ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/48B01J38/60B01J38/62B01J38/66B01D53/56B01D53/86
Inventor 吴凡严纯华
Owner COUNTRY JIANGSU CATALYST REGENERATION TECH
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