Regeneration method of flue gas scr denitrification catalytic filter element

A catalytic filtration and denitration technology, applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve problems such as the inability to regenerate filter elements, the inability of catalytic filter elements to reduce filtration efficiency and catalytic activity, etc.

Active Publication Date: 2017-12-26
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the special equipment for industrial furnace gas dedusting and denitrification has been used for a period of time, the filtration efficiency and catalytic activity of the catalytic filter element have decreased and cannot meet the requirements. In order to ensure the cleanliness of the purified flue gas, the filter element needs to be replaced regularly in actual operation, resulting in Filter elements cannot be recycled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] After actually using the catalytic filter element to catalytically filter the flue gas for a certain period of time, the filtration flux and denitrification efficiency are significantly reduced. It is therefore necessary to regenerate the catalytic filter element. In this embodiment, the SCR denitrification catalytic filter element that needs to be regenerated constitutes its catalytic active layer by V 2 o 5 form or with V 2 o 5 As the main component, with WO 3 and MoO 3 At least one of them is a mixture of auxiliary components. In this embodiment, the regeneration method of the flue gas SCR denitrification catalytic filter element comprises the following steps:

[0014](1) Use 0.5MPa compressed air to purge the outer surface of the SCR denitrification catalytic filter element, and then use 1MPa compressed air to carry out multiple backflushing of the catalytic filter element from the inside to the outside;

[0015] (2) After the above-mentioned purging is compl...

Embodiment 2

[0020] The difference between this embodiment and embodiment 1 is that in step (1), 0.4MPa compressed air is used to purge the outer surface of the SCR denitration catalytic filter element, and then 0.8MPa compressed air is used to clean the catalytic filter element from the inside Perform multiple backflushing to the outside; in step (2), soak the catalytic filter element in a dilute sulfuric acid solution with a pH of 5 for 1.5 hours, and then use hot air at 115°C to dry the catalytic filter element for 2 hours; step (3) The concentration of oxalic acid in the active liquid is 200mg / L, the concentration of ammonium metavanadate is 80mol / L, the concentration of ammonium metatungstate is 60mol / L, and the catalytic filter element is immersed in this mixed aqueous solution for 3h; In step (4) The impregnated catalytic filter element was baked at a high temperature of 300° C. for 6 hours.

[0021] After the SCR denitrification catalytic filter element is processed by the regenera...

Embodiment 3

[0023] The difference between this embodiment and embodiment 1 is that in step (1), 0.3MPa compressed air is used to purge the outer surface of the SCR denitration catalytic filter element, and then 0.5MPa compressed air is used to clean the catalytic filter element from the inside Perform multiple backflushing to the outside; in step (2), soak the catalytic filter element in a dilute hydrochloric acid solution with a pH of 6 for 1 hour, and then use hot air at 105°C to dry the catalytic filter element for 4 hours; step (3) activity The concentration of oxalic acid in the liquid is 150mg / L, the concentration of ammonium metavanadate is 60mol / L, the concentration of ammonium metatungstate is 40mol / L, and catalytic filter element is soaked 3h in this mixed aqueous solution; In step (4), will The impregnated catalytic filter elements were baked at 450°C for 2 hours.

[0024] After the SCR denitrification catalytic filter element is processed by the regeneration method in this exa...

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PUM

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Abstract

The invention discloses a method for regenerating the flue gas SCR denitrification catalytic filter element for recovering the filtration efficiency and catalytic activity of the SCR denitrification catalytic filter element. The steps include (1) purging the surface of the SCR denitration catalytic filter element with compressed gas, and then backflushing the SCR denitrification catalytic filter element from the inside to the outside; (2) soaking the above SCR denitrification catalytic filter element with dilute acid solution; ( 3) After the above-mentioned SCR denitration catalytic filter element is immersed in the dilute acid solution, it is immersed in the active liquid so as to supplement the catalytic active components on the surface of the SCR denitrification catalytic filter element; After the impregnation is sufficient, the SCR denitration catalytic filter element is taken out for roasting, and finally a regenerated SCR denitration catalytic filter element is obtained. Wherein, the active liquid is a solution that has the function of supplementing the catalytic active components on the surface of the SCR denitration catalytic filter element, and the solution includes a salt solution of the SCR denitration catalyst.

Description

technical field [0001] The invention relates to a method for regenerating a flue gas filter element, in particular to a method for regenerating a flue gas SCR denitrification catalytic filter element. Among them, the term "flue gas" generally refers to the flue gas generated in industrial kilns. Background technique [0002] Nitrogen oxides are one of the main components of air pollution, how to control the emission of nitrogen oxides has always been the focus of attention. The boiler flue gas produced in coal-fired boilers contains a large amount of nitrogen oxides. As a large coal-consuming country in my country, more than 70% of the nitrogen oxides come from coal combustion. In addition to containing nitrogen oxides, the boiler flue gas also contains a large amount of dust. In order to purify the flue gas containing nitrogen oxides and high dust, the applicant of the present invention discloses an industrial Furnace gas dust removal and denitrification integrated treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/96B01D53/90B01D53/56
Inventor 高麟汪涛张祥剑唐勇刘超
Owner CHENGDU INTERMENT TECH
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