Formula for coal-fired flue gas denitrification catalyst activity regeneration

A denitration catalyst, coal-fired flue gas technology, applied in catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc. Influence and other problems, to achieve the effect of solving toxic effects

Inactive Publication Date: 2012-11-07
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfuric acid will also cause the catalyst skeleton to soften, thereby reducing the mechanical strength of the catalyst, and to a certain extent, the repeated regeneration and utilization of the catalyst will be affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take a piece of honeycomb-type monolithic catalyst that has been running for more than 15000 h, with a volume of 122.5 cm 3 , after removing the dust from the surface, place it in the regeneration solution. The regeneration solution consists of (NH 4 ) 2 SO 4 (0.1~10 mol / L), EDTA (0.01~0.2 wt %), OP~(n) (n=10, 0.1~5 wt %), penetrant JFC (0.1~5 wt %), flat plus O (0.1~5 wt %), and using oxalic acid as solvent, adding ammonium metavanadate (0.5~10 wt %), ammonium paratungstate (0.5~10 wt %). During the regeneration process, the bottom aeration is used for auxiliary cleaning to remove the sediment in the internal pores of the catalyst. Drying and high-temperature calcination are carried out after the regeneration to remove the residual (NH 4 ) 2 SO 4 solid. The activity of the catalyst after regeneration was 96%, which was 35.7% higher than that before regeneration; the specific surface area of ​​the catalyst increased by 22.0%.

Embodiment 2

[0022] Take a honeycomb-type monolithic catalyst with a volume of 122.5 cm 3 , after cleaning the surface dust, put it in the regeneration solution. The regeneration solution consists of (NH 4 ) 2 SO 4 (0.1~10 mol / L), EDTA (0.01~0.2 wt %), OP~(n) (n=10, 0.1~5 wt %), penetrant JFC (0.1~5 wt %), flat plus O (0.1~5 wt %), and using oxalic acid as solvent, adding ammonium metavanadate (0.5~10 wt %), ammonium paratungstate (0.5~10 wt %). During the regeneration process, the bottom aeration is used for auxiliary cleaning to remove the sediment in the internal pores of the catalyst. Drying and high-temperature calcination are carried out after the regeneration to remove the residual (NH 4 ) 2 SO 4 solid. The activity of the catalyst after regeneration is 94%, which is 66.7% higher than that before regeneration; the specific surface area of ​​the catalyst is increased by 25.1%.

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PUM

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Abstract

Provided is a formula for coal-fired flue gas denitrification catalyst activity regeneration, belonging to the technical field of air pollution control. The formula of the invention mainly makes use of a composite regeneration solution mainly including (NH4)2SO4, ethylene diamine tetraacetic acid (EDTA), alkylphenol ethoxylates (OP-(n), n=10), high-carbon fatty alcohol polyoxyethylene ether (penetrantfor JFC and nylon leveling agent O), ammonium metavanadate and ammonium paratungstate to recover the activity of a deactivated catalyst. The formula of the invention selects the inexpensive and operationally safe (NH4)2SO4 as the main ingredient of a regenerant, adds the EDTA component, and effectively removes heavy metal elements on the surface of the catalyst. The formula can maximally recover the catalyst activity on the basis of no influence on the mechanical properties of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and relates to a formula for active regeneration of a coal-fired flue gas denitrification catalyst in a thermal power plant. Background technique [0002] In recent years, with the continuous increase of installed capacity of coal-fired power stations in my country, the emission of NOx in coal-fired flue gas has also continued to increase. Statistics from China Environmental Protection Industry Association show that the total amount of NOx emitted by coal-fired power stations in 2007 has exceeded 8.4 million tons, accounting for about 40% of the country's NOx emissions, seriously offsetting the amount of SO in coal-fired flue gas in my country. 2 Great achievements have been made in reducing emissions. [0003] In the "Emission Standards of Air Pollutants for Thermal Power Plants" (Second Draft for Comment) issued by the Ministry of Environmental Protection in January 2011, the NO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/66B01J38/62B01D53/56B01D53/86
Inventor 陈进生商雪松何炽
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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