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Regeneration method of inactivated SCR denitration catalyst

A denitration catalyst and catalyst technology, which are applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems that denitration activity cannot meet the national nitrogen oxide emission standard for a long time, poisoning active components, and complex flue gas components. , to save drying time, improve physical structure, and facilitate regeneration.

Inactive Publication Date: 2015-06-24
南京宇行环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the commercial SCR denitration catalysts in the domestic market are V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 , due to the complex composition of the flue gas during the operation of the denitrification process, and the high temperature of the flue gas, it will lead to catalyst sintering, poisoning and loss of active components, which will reduce the denitrification efficiency. According to the cause of catalyst deactivation, China is actively looking for catalysts suitable for my country Regeneration method of operating conditions
[0004] At present, the existing regeneration methods still cannot meet the national nitrogen oxide emission standards for a long time for the denitrification activity after regeneration.

Method used

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Embodiment 1

[0029] Regenerate a commercial denitrification catalyst that has been in operation for 26,000 hours in a power plant, a regeneration method for a deactivated SCR denitrification catalyst, the specific steps are as follows:

[0030] 1) Using 2.5Mpa oil-free dry compressed air, the flow rate is 0.5m 3 / s Purge the deactivated monomer catalyst for 1 hour to remove the dust with weak adhesion on the surface of the catalyst;

[0031] 2) the catalyst that will be placed in concentration through step 1) is that the strong alkali weak acid salt sodium carbonate of 1.0mol / L, the tensio-active agent flat add O concentration is 0.3wt%, penetrant JFC concentration is 0.5wt% and removes In the mixed solution composed of ionized water, supplemented by ultrasonic immersion for 20min, the power is 500W;

[0032] 3) Place the catalyst treated in step 2) in an organic acid solution: the concentration of formic acid is 0.8mol / L, the concentration of surfactant Pingping O is 0.3%wt, the concentr...

Embodiment 2

[0043] Regenerate a commercial denitrification catalyst that has been in operation for 25,000 hours in a power plant, a method for regeneration of a deactivated SCR denitrification catalyst, the specific steps are as follows:

[0044] 1) Use 3Mpa oil-free dry compressed air with a flow rate of 0.8m 3 / s purge the deactivated monomer catalyst for 1.5h to remove the dust with weak adhesion on the surface of the catalyst;

[0045] 2) Place the catalyst treated in step 1) into a strong base and weak salt sodium acetate with a concentration of 1.6mol / L, the concentration of the surfactant Pingping O is 0.3wt%, and the concentration of the penetrant JFC is 0.5wt% In the mixed solution composed of deionized water, supplemented by ultrasonic immersion for 40min, the power is 200W;

[0046] 3) placing the catalyst treated in step 2) in an organic acid solution with a concentration of acetic acid of 0.8mol / L, the concentration of the surfactant Pingping O is 0.3%wt, the concentration o...

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Abstract

The invention discloses a regeneration method of an inactivated SCR denitration catalyst and particularly relates to a regeneration method of a catalyst. The method comprises the following step: splitting an inactivated catalyst into monomers to be regenerated, namely purging the inactivated catalyst at negative pressure; carrying out ultrasonic cleaning by an alkaline solution; carrying out ultrasonic pickling; washing by deionized water; chambering; carrying out regeneration liquid; drying; and roasting. Through the catalyst regeneration method, the denitration performance of the catalyst is relatively hugely improved, the physical structure of the catalyst is obviously improved, the service life of the catalyst is prolonged, the regeneration time is saved, the operating cost of SCR denitration by an enterprise is greatly lowered, and industrial actual operation is facilitated.

Description

technical field [0001] The invention relates to a regeneration method of a catalyst, in particular to a regeneration method of a deactivated SCR denitration catalyst. Background technique [0002] The development of industrialization has exacerbated the deterioration of the environment, and environmental problems such as smog have become increasingly prominent. The country is stepping up efforts to control environmental problems, and the pollution caused by coal-fired boilers has also attracted everyone's attention. With the implementation of the "Twelfth Five-Year Plan" emission reduction tasks, the national nitrogen oxide emission standards have become more stringent, which has accelerated the development of denitrification technology. Among these denitrification technologies, selective catalytic reduction technology has always occupied a large market share, and this technology is mature and reliable, but the development of this technology is mainly restricted by the high ...

Claims

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Application Information

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IPC IPC(8): B01D53/96B01D53/56
Inventor 徐海涛张亚平李娟宋静周长城沈凯朱孝强
Owner 南京宇行环保科技有限公司
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