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Method for diagnosing regenerability of inactivating denitration catalyst

A denitrification catalyst, regeneration performance technology, applied in the direction of instruments, surface/boundary effects, measurement devices, etc., can solve the problem that there is no method and standard for the regeneration performance and judgment of deactivated catalysts, so as to save treatment costs and increase regeneration efficiency effect

Inactive Publication Date: 2013-10-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no method and standard for judging the regenerability of deactivated catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A catalyst that has been used in the power plant for 1 year is selected for diagnosis. Scanning electron microscopy of the deactivated catalyst and the fresh catalyst, the morphology of the catalyst surface was observed. The surface of the deactivated catalyst did not have obvious agglomeration compared with the fresh catalyst. There were very few large spherical particles, and the total area was only 5 % Below, the first step is qualified for the second step. The BET test was performed on the fresh catalyst and the deactivated catalyst. The specific surface area of ​​the deactivated catalyst was calculated by calculating the specific surface area of ​​the fresh catalyst and the deactivated catalyst. The specific surface area of ​​the deactivated catalyst was reduced by 3.6%. The EDS energy spectrum analysis of fresh catalyst and deactivated catalyst shows that the surface covering of the deactivated catalyst is mainly K, Ca, Na, S and other easily removable elements. Th...

Embodiment 2

[0023] A catalyst that has been used in the power plant for 3 years is selected for diagnosis. Scanning electron microscopy of the deactivated catalyst and the fresh catalyst, the morphology of the catalyst surface was observed. The surface of the deactivated catalyst was partially agglomerated with respect to the fresh catalyst. Some large spherical particles appeared, with a total area of ​​about 30%. The first step is qualified for the second step. The BET test was performed on the fresh catalyst and the deactivated catalyst. By calculating the specific surface area of ​​the fresh catalyst and the deactivated catalyst, the specific surface area of ​​the deactivated catalyst was reduced by 8.4%, and the second step was qualified for the third step. The EDS energy spectrum analysis of fresh catalyst and deactivated catalyst shows that the Si element content in the surface covering of the deactivated catalyst is 5.3%, the Al element content is 4.2%, the Ti element is reduced to...

Embodiment 3

[0026] A catalyst that has been used in the power plant for 5 years is selected for diagnosis. Scanning electron microscope on the deactivated catalyst and the fresh catalyst, the morphology of the catalyst surface was observed. The surface of the deactivated catalyst was obviously agglomerated compared with the fresh catalyst. There were a lot of large spherical particles, and the total area of ​​the large spherical particles occupied the catalyst surface. 80% of the products fail the first step, so the second step is not required.

[0027] Through diagnosis, the reproducibility of this deactivated catalyst is extremely poor. After regeneration, the activity of the catalyst is measured in the SCR device. The denitration efficiency of the catalyst after regeneration is only 74.1%, which is basically unable to be put into use again.

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Abstract

The invention aims at providing a method for diagnosing regenerability of an inactivating denitration catalyst, which can be used for judging and classifying the catalysts with different regenerability, and provides the basis for regeneration and process. The method comprises the following four diagnosis processes of SEM (scanning electron microscope), BET (Brunauer, Emmett and Teller) test, EDS (energy dispersive spectrometer) energy spectrum analysis, and XRF (x-ray fluorescence) analysis to diagnose the regenerability of the inactivating catalyst, the inactivating catalysts are tested in sequence, and the catalyst meeting the last step of requirement needs to be tested in the next step. The method is highly targeted, and can be used for judging the regenerability of catalysts which have different inactivating degrees and are inactive due to different reasons through the represented differences.

Description

[0001] Technical field [0002] The invention belongs to the technical field of SCR catalysts, and specifically relates to a diagnosis of the reproducible performance of a deactivated denitration catalyst. Background technique [0003] In order to respond to the country's new requirements for nitrogen oxide emissions and protect the atmosphere, new coal-fired power plants must install SCR devices. The core of the SCR system lies in its catalyst. As the use time increases, the denitration efficiency of the SCR catalyst will gradually decrease, and it is necessary to regenerate the deactivated denitration catalyst. [0004] The core of the SCR system is its catalyst. Within 3-5 years, a large number of denitration catalysts will be deactivated. It is undoubtedly a huge cost to replace the abandoned catalysts in the power plant. At the same time, the denitration catalyst cannot be treated as ordinary solid waste. Due to the complexity of its components, it has a certain environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22G01N23/00G01N23/223G01N13/00
Inventor 胡将军李徐
Owner WUHAN UNIV
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