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A method for regenerating a denitrification catalyst by utilizing waste scr catalyst recovery liquid

A technology of SCR catalyst and denitrification catalyst, which is applied in the field of regeneration of denitrification catalyst by using waste SCR catalyst recovery liquid, which can solve the problems of increasing the cost of regeneration process and polluting the environment by harmful metal compounds, so as to save the cost of recycling process, shorten the process cycle, and improve the denitrification activity. Improved effect

Active Publication Date: 2015-09-16
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dissolving compounds containing vanadium, tungsten or molybdenum in the regeneration active liquid will not only increase the cost of the regeneration process, but also cause harmful metal compounds to further pollute the environment, such as the generation of related sewage

Method used

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  • A method for regenerating a denitrification catalyst by utilizing waste scr catalyst recovery liquid
  • A method for regenerating a denitrification catalyst by utilizing waste scr catalyst recovery liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Take a waste honeycomb SCR catalyst (size: 68 cm×15 cm×15 cm; service life: 38 months; the intake end is severely worn; the middle part is cracked; the pore clogging rate is about 1 / 6), and use a compressed air gun Purge the fly ash on the surface and in the pores for about 20 minutes, the air pressure is 0.3 MPa, and then use a high-pressure water gun to flush the catalyst pores from the inlet end, and adjust the water pressure to 1 MPa until all the pores are dredged and the surface fly ash is removed. The ashes were washed away, and then the catalyst was put into a blast drying oven, and the temperature was raised to 100°C at a rate of 10°C / min, and kept for 2 h. Take out the catalyst, cut out about 500 g of the catalyst block from the middle, crush it slightly with tweezers, put it into a rotary pulverizer, and after pulverizing for about 3 minutes, add 100 g of calcium carbonate, then turn on the pulverizer for about 3 minutes, and then stop the pulverizer , take ou...

Embodiment 2

[0038] From one end of the catalyst after soot blowing and drying in Example 1, intercept about 500 g of the catalyst block, after slightly crushing with tweezers, put it into a rotary pulverizer, after pulverizing for about 3 min, add 200 g of calcium carbonate, and then pulverize for 3 min , then stop the pulverizer and take out the powder.

[0039] Put the mixed powder into an alumina crucible, then put it into a muffle furnace, raise the temperature to 800 °C at a rate of 4 °C / min, keep it warm for 5 h, and then put the roasted block back into the rotary pulverizer, Crush for about 3 minutes, take out the powder, put it into a beaker, add 1 L of 5% sulfuric acid solution, stir with an electric stirrer for 2 hours in a water bath at 85°C, then adjust the pH value to 10 with ammonia water, add 7 g of MgCl 2 powder and stirred for 30 min, then filtered using vacuum filtration equipment, rinsed the filter residue 3 times with deionized water, collected the filter residue f...

Embodiment 3

[0042] From one end of the catalyst after soot blowing and drying in Example 1, intercept about 500 g of the catalyst block, after slightly crushing with tweezers, put it into a rotary pulverizer, after pulverizing for about 3 min, add 100 g of calcium carbonate, and then pulverize for 3 min , then stop the pulverizer and take out the powder.

[0043] Put the mixed powder into an alumina crucible, then put it into a muffle furnace, raise the temperature to 900°C at a rate of 4°C / min, keep it warm for 3 hours, and then put the roasted block back into the rotary pulverizer, Crush for about 3 minutes, take out the powder, put it into a beaker, add 1 L of 2% sulfuric acid solution, stir with an electric stirrer for 2 hours in a water bath at 90°C, then adjust the pH value to 11 with ammonia water, add 10 g of MgCl 2 powder and stirred for 30 min, then filtered using vacuum filtration equipment, rinsed the filter residue 3 times with deionized water, collected the filter residu...

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Abstract

The invention discloses a method for regenerating a denitration catalyst by utilizing a waste SCR (Selective Catalytic Reduction) catalyst recovery liquid. The method comprises the following steps: after soot blowing, cleaning and drying pretreatment on a waste SCR catalyst, smashing the waste SCR catalyst into powder; evenly mixing the powder with calcium carbonate to obtain a mixture; roasting the mixture to obtain a roasted material; re-smashing the roasted material to obtain a re-smashed material and adding the re-smashed material into a dilute sulphuric acid solution; adjusting the value of pH to 8-11 by ammonium hydroxide; filtering for separating out titanium-containing residues and thus obtaining a recovery liquid; after soot blowing, cleaning and drying pretreatment on an inactivated SCR catalyst block body, soaking the block body in the recovery liquid; drying the block body; roasting the block body in a muffle furnace with the temperature of 400-600 DEG C, thereby obtaining the regenerated SCR catalyst with denitration activity being recovered. The method organically integrates catalyst recovery and regeneration technologies. The precious metal components of the waste SCR catalyst are fully utilized, the problem of vanadium, tungsten or molybdenum separation-purification is avoided, the recovery and regeneration technology process is shortened, and the treatment expenditure of the waste SCR denitration catalyst is lowered.

Description

technical field [0001] The invention relates to the technical field of denitrification catalyst recovery and regeneration, in particular to a method for regenerating a denitrification catalyst by utilizing a waste SCR catalyst recovery liquid. Background technique [0002] Selective Catalytic Reduction (SCR) denitration technology is an efficient, reliable and mature flue gas denitrification technology, which is widely used in coal-fired power plant boiler flue gas denitrification systems in China. SCR denitrification catalyst is a key component of this technology. The "Twelfth Five-Year Plan" requires my country's coal-fired power plants to strictly implement the new standards for flue gas denitrification, which stimulated the explosive growth of SCR catalyst market demand during the "Twelfth Five-Year Plan" period. With the current use of hundreds of millions of tons of SCR catalysts, in a few years, the waste or deactivated SCR catalysts will become a major solid waste tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/48B01J38/60B01J37/00C01G23/047
CPCY02P20/10Y02P20/584
Inventor 路光杰汪德志肖雨亭杨建辉梅雪欧阳丽华张弘
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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