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Regeneration method of expired scr denitrification catalyst

A denitrification catalyst and active technology, applied in the field of denitrification catalysis, can solve the problems of inability to regenerate the catalyst, inability to comprehensively treat the catalyst, and incomplete removal of surface deposits, etc., and achieve the effect of high activity

Active Publication Date: 2017-06-06
安徽迪诺环保新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing SCR flue gas denitrification catalyst regeneration technology cannot comprehensively treat the catalyst deactivated due to various reasons, the removal of surface deposits is incomplete, and the catalyst deactivated by carbon deposition cannot be regenerated , to provide a regeneration method for efficient SCR denitrification catalyst

Method used

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  • Regeneration method of expired scr denitrification catalyst
  • Regeneration method of expired scr denitrification catalyst
  • Regeneration method of expired scr denitrification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: (1) Purge: Use clean and dry compressed air to purge the invalid SCR denitrification catalyst to clean the solid particles and dust on the surface of the catalyst; (2) Heat treatment: Purge the SCR Put the denitrification catalyst in a muffle furnace for heat treatment at 300°C for 2 hours to remove easily decomposed substances adsorbed on the surface such as carbon deposits, sulfur deposits and metal deposits; (3) Washing: put the heat-treated SCR denitrification catalyst into deionized Soak in water until the ion concentration in deionized water is stable, and initially remove the metals and salts precipitated on the surface of the catalyst; (4), pickling: place the washed SCR denitration catalyst in a mixed solution of 10wt% sulfuric acid and 5wt% hydrofluoric acid , ultrasonically dispersed for 2 hours to further remove metals and salts precipitated on the surface of the catalyst; (5), active regeneration: soak the acid-washed SCR denitration catalyst in a...

Embodiment 2

[0016] The difference between Example 2 and Example 1 is that the purging of step (1) is carried out in a closed negative pressure environment, so that the effect of removing solid particles and dust on the surface of the catalyst is better. When the solid particles and dust are pushed by compressed air After leaving the catalyst surface, it will not fall back to the catalyst surface due to gravity to form secondary pollution. The catalyst of Example 2 and the catalyst of Example 1 are compared in activity, and the specific data are shown in the following table:

[0017]

[0018] It can be seen that the activity of Example 2 is slightly higher than that of Example 1.

Embodiment 3

[0019] Preferred embodiment 3: (1) Purge: Use clean and dry compressed air to purge the expired SCR denitration catalyst; (2) Heat treatment: Put the purged SCR denitration catalyst into a muffle furnace at 300°C Heat treatment for 2 hours; (3) Washing: Soak the heat-treated SCR denitrification catalyst in deionized water, change the deionized water every 15 minutes, take samples to detect the ion content in the washing water, until the ion concentration in the deionized water is stable, Electrify in deionized water with a current of 5A; (4), pickling: place the washed SCR denitration catalyst in a mixed solution of 10wt% sulfuric acid and 5wt% hydrofluoric acid, and ultrasonically disperse it for 2 hours; (5), active regeneration: put The acid-washed SCR denitration catalyst was immersed in an active mixed solution containing 5wt% ammonium paratungstate and 1wt% ammonium metavanadate for 2 hours, and then it was taken out and dried.

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Abstract

The invention discloses a regenerating method of an invalid SCR denitration catalyst. The regenerating method comprises the following steps: (1) purging; (2) carrying out thermal treatment; (3) washing; (4) carrying out acid pickling, namely, putting the SCR denitration catalyst after washing into a mixed solution of 10wt% sulfuric acid and 5wt% hydrofluoric acid, and carrying out ultrasonic dispersion for 2 hours; and (5) carrying out activity regeneration, namely, soaking the SCR denitration catalyst after acid pickling into an active mixed solution containing 5wt% ammonium paratungstate and 1wt% ammonium metavanadate for 2 hours, taking out, and drying. The regenerating method has the beneficial effects that a catalyst which is invalid because of multiple reasons can be comprehensively treated in practical production, so that not only can the surface deposition of the catalyst be removed, but also can the poisoned catalyst be restored, and the active components of the catalyst can be activated; the regenerated catalyst is high in denitration activity and cannot generate pollution in the use process.

Description

technical field [0001] The invention relates to the technical field of denitrification catalysis, in particular to a regeneration method for a spent SCR denitrification catalyst. Background technique [0002] Catalyst is the core part of the whole SCR denitrification system. As the use time of the catalyst increases, the catalyst will gradually deactivate. The main reasons mainly include four aspects: (1) Catalyst poisoning caused by arsenic and alkali metals: arsenic-alkali The metal diffuses into the micropore structure of the catalyst under high temperature conditions, reacts on the surface of the catalyst, occupies and destroys the active site of the catalyst, and leads to the deactivation of the catalyst. (2) Catalyst blockage: Small particles of fly ash and ammonium salts formed during the reaction process are deposited in the small pores on the catalyst surface, causing catalyst blockage and preventing NOx, NH3, O2 from reaching the active surface of the catalyst, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/02B01J38/12B01J38/60B01J38/64B01J38/52B01J38/56B01D53/56B01D53/86
CPCY02C20/30
Inventor 荚玉冬韩军军赵义凯
Owner 安徽迪诺环保新材料科技有限公司
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