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A regeneration method for a deactivated selective catalytic reduction denitrification catalyst

A denitrification catalyst and selective technology, which is applied in the field of regeneration of deactivated selective catalytic reduction denitrification catalyst, can solve the problems of poor activity recovery ability of deactivated catalyst and decline of catalyst mechanical strength, and achieve the degree of activity recovery and avoid corrosion. Effect

Active Publication Date: 2017-05-03
中建中环新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deactivation SCR denitration catalyst regeneration method in the prior art is only aimed at by SiO 2 The deactivation caused by one or two factors in , As, P and alkali metals, the activity recovery ability of the deactivated catalyst is relatively poor, and it is easy to lead to the lack of mechanical strength of the catalyst, providing a deactivation option Regeneration method of catalytic reduction denitrification catalyst

Method used

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  • A regeneration method for a deactivated selective catalytic reduction denitrification catalyst
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  • A regeneration method for a deactivated selective catalytic reduction denitrification catalyst

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Embodiment 1

[0037] 1. Regeneration treatment of deactivated SCR denitration catalyst

[0038] A regeneration method of a deactivated selective catalytic reduction denitrification catalyst in this embodiment, its technological process is as follows figure 1 Shown, the concrete steps of this regeneration method are:

[0039] (1) Take a deactivated SCR denitrification catalyst (V 2 o 5 -WO 3 / TiO 2 , wall thickness: 1.1mm, pitch: 8.2mm, catalyst size: 150mm×150mm×800mm), use clean and dry compressed air to blow the deactivated SCR denitrification catalyst to remove the fly ash deposited on the surface of the catalyst, for the subsequent catalyst Prepare for the regeneration process; among them, the working pressure of compressed air is 0.5MPa, and the gas flow rate is 0.5m 3 / s, the purge time is 10min.

[0040] (2) Place the catalyst after soot blowing treatment in 100L of the first cleaning solution, and perform ultrasonic-assisted cleaning at room temperature 25°C for 20min to remov...

Embodiment 2

[0058] 1. Regeneration treatment of deactivated SCR denitration catalyst

[0059] A regeneration method of a deactivated selective catalytic reduction denitrification catalyst in this embodiment, its technological process is as follows figure 1Shown, the concrete steps of this regeneration method are:

[0060] (1) Take a deactivated SCR denitrification catalyst (V 2 o 5 -WO 3 / TiO 2 , wall thickness: 1.1mm, pitch: 8.2mm, catalyst size: 150mm×150mm×800mm), use clean and dry compressed air to blow the deactivated SCR denitrification catalyst to remove the fly ash deposited on the surface of the catalyst; among them, the compressed air The working pressure is 0.8MPa, the gas flow rate is 1.0m 3 / s, the purge time is 18min.

[0061] (2) Place the catalyst after soot blowing treatment in 100L of the first cleaning solution, and perform ultrasonic-assisted cleaning at room temperature 23°C for 80min to remove SiO deposited on the surface of the catalyst 2 , the first cleaning...

Embodiment 3

[0069] 1. Regeneration treatment of deactivated SCR denitration catalyst

[0070] A regeneration method of a deactivated selective catalytic reduction denitrification catalyst in this embodiment, its technological process is as follows figure 1 Shown, the concrete steps of this regeneration method are:

[0071] (1) Take a deactivated SCR denitrification catalyst (V 2 o 5 -WO 3 / TiO 2 , wall thickness: 1.1mm, pitch: 8.2mm, catalyst size: 150mm×150mm×800mm), use clean and dry compressed air to blow the deactivated SCR denitrification catalyst to remove the fly ash deposited on the surface of the catalyst; among them, the compressed air The working pressure is 1.5MPa, the gas flow rate is 1.2m 3 / s, the purge time is 20min.

[0072] (2) Place the catalyst after soot blowing treatment in 100L of the first cleaning solution, and perform ultrasonic-assisted cleaning at room temperature 27°C for 20 minutes to remove SiO deposited on the surface of the catalyst 2 , the first cl...

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Abstract

The invention discloses a regeneration method for an inactivated selective catalytic reduction (SCR) denitration catalyst and belongs to the technical field of regeneration methods for inactivated denitration catalysts. The method comprises the following steps: mechanically removing ash, performing ultrasonic cleaning with a NH4F solution, cleaning with an oxalic acid solution, and drying, and further comprises the specific steps: firstly cleaning SiO2 deposited on the surface of the inactivated SCR catalyst with the acidulous NH4F solution; adjusting the pH value of the solution by adding ammonium hydroxide to 9.0-12.0; removing arsenic and phosphorus on the surface of the catalyst; cleaning the catalyst with the oxalic acid solution; and removing alkali metals on the surface of the catalyst. By using the regeneration method disclosed by the invention, SiO2, arsenic, phosphorus and the alkali metals deposited on the surface of the inactivated SCR denitration catalyst can be removed with high efficiency; active components of the catalyst are low in dissolution rate; harmful residues can not be formed on the surface of the catalyst; the activity of the regenerated catalyst can be recovered to 90% or more that of a new catalyst; meanwhile, the mechanical strength and the selectivity of the catalyst can not be reduced, and the regeneration method has relatively high industrial application value.

Description

technical field [0001] The invention belongs to the technical field of deactivated denitrification catalyst regeneration method, and more specifically relates to a regeneration method of deactivated selective catalytic reduction (SCR) denitrification catalyst. Background technique [0002] NO from coal combustion x It is one of the main air pollutants that cause acid rain, smog and photochemical smog. Its discharge will bring serious harm to the natural environment and human life. The total amount of nitrogen oxides discharged into the atmosphere in the world reaches 5 million tons every year. above, of which NO x The content of NO is the most in the water, accounting for more than 95%. Therefore, the NO emissions from coal combustion x Effective treatment and control is of great significance to protect the living environment of human beings. Selective Catalytic Reduction (SCR) denitrification technology is mainly used in the prior art to reduce the NOx emitted by coal c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/04B01J38/62B01J38/66B01J23/92
Inventor 贾勇李睦周军王烨谢江坤关正文
Owner 中建中环新能源有限公司
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