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Regeneration method of deactivated denitrification catalyst

A denitration catalyst and catalyst technology, which can be used in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of insufficient removal of arsenic compounds, and achieve the effect of restoring denitration efficiency.

Active Publication Date: 2021-08-31
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the regenerated denitrification catalyst in the prior art is not thorough enough to remove arsenic compounds, and to provide a regeneration method for the deactivated denitrification catalyst. The effect of improving the denitrification rate of the regenerated catalyst

Method used

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  • Regeneration method of deactivated denitrification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Preparation of various catalyst cleaning solutions

[0059] Pre-pickling liquid: containing sulfuric acid, ammonium sulfate, JFC, OP-10 and defoamer W-3, the content is respectively 0.3mol / l, 0.2mol / l, 0.025% by weight, 0.05% by weight, 0.08% by weight, pH <3;

[0060] Oxidation cleaning solution: containing 5% by weight of hydrogen peroxide;

[0061] Alkali lotion: containing sodium hydroxide, JFC, OP-10 and defoamer W-3, the contents are respectively 0.3mol / l, 0.025% by weight, 0.05% by weight, 0.08% by weight, pH=12;

[0062] Pickling solution: containing sulfuric acid, ammonium sulfate, JFC, OP-10 and defoamer W-3; contents are 0.3mol / l, 0.2mol / l, 0.025% by weight, 0.05% by weight, 0.08% by weight, pH< 3;

[0063] Impregnation solution: containing ammonium metavanadate, ammonium heptamolybdate, and oxalic acid, the content of which is 0.5% by weight, 1% by weight, and 2% by weight, respectively.

[0064] (2) Regeneration of the deactivated denitration cataly...

Embodiment 2

[0074] (1) Preparation of various catalyst cleaning solutions

[0075] Pre-pickling liquid: containing sulfuric acid, ammonium sulfate, JFC, OP-10 and defoamer W-3, the contents are respectively 0.2mol / l, 0.05mol / l, 0.01% by weight, 0.1% by weight, 0.3% by weight, pH <3;

[0076] Oxidation cleaning solution: containing 4% by weight of potassium perchlorate;

[0077] Alkali lotion: containing sodium hydroxide, JFC, OP-10 and defoamer W-3, the contents are respectively 0.5mol / l, 0.03% by weight, 0.3% by weight, 0.15% by weight, pH=14;

[0078] Pickling solution: containing sulfuric acid, ammonium sulfate, JFC, OP-10 and defoamer W-3; contents are 0.5mol / l, 0.05mol / l, 0.01% by weight, 0.1% by weight, 0.3% by weight, pH < 3;

[0079] Impregnation solution: containing ammonium tungstate, ammonium molybdate, and ammonia water, the content of which is 2% by weight, 1% by weight, and 5% by weight respectively.

[0080] (2) Regeneration of the deactivated denitration catalyst: the ...

Embodiment 3

[0090](1) Prepare aqueous solutions of various catalyst cleaning solutions

[0091] Pre-pickling liquid: containing sulfuric acid, ammonium sulfate, JFC, OP-10 and defoamer W-3, the content is respectively 0.4mol / l, 0.09mol / l, 0.2% by weight, 0.25% by weight, 0.01% by weight, pH <3;

[0092] Oxidation cleaning solution: containing 10% by weight of potassium permanganate;

[0093] Alkaline lotion: containing ammonia, JFC, OP-10 and defoamer W-3, the contents are respectively 0.05mol / l, 0.15% by weight, 0.25% by weight, 0.1% by weight, pH=13;

[0094] Pickling solution: containing sulfuric acid, ammonium sulfate, JFC, OP-10 and defoamer W-3; contents are 0.4mol / l, 0.09mol / l, 0.2% by weight, 0.25% by weight, 0.01% by weight, pH< 3;

[0095] Impregnation solution: containing ammonium metavanadate, ammonium molybdate, cerium nitrate, and oxalic acid, the content of which is 0.5% by weight, 1% by weight, 1% by weight, and 3% by weight respectively.

[0096] (2) Regeneration of t...

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Abstract

The invention relates to the field of regeneration of denitration catalysts, and discloses a regeneration method for deactivated denitration catalysts. Including: (1) first immersing the deactivated denitrification catalyst with a pre-acid wash solution after physical deashing, and then performing the first bubbling cleaning; (2) cleaning the catalyst after step (1) with an oxidation cleaning solution Carry out the second immersion, then carry out oxidative ultrasonic cleaning; (3) carry out the 3rd immersion with alkaline washing liquid to the catalyst after step (2) cleaning, then carry out ultrasonic alkaline cleaning and rinse with water; (4) will pass through step (3) ) the cleaned catalyst is ultrasonically pickled with a pickling solution, and then subjected to a second bubbling cleaning; (5) the catalyst cleaned in step (4) is impregnated with an impregnating solution, then dried and calcined to obtain a regenerated denitration catalyst . Taking step-by-step chemical cleaning can more effectively remove the arsenic compound deposited in the micropores of the deactivated denitration catalyst, and more effectively restore the denitration efficiency of the deactivated denitration catalyst.

Description

technical field [0001] The invention relates to the field of regeneration of denitration catalysts, in particular to a regeneration method of deactivated denitration catalysts. Background technique [0002] The denitrification catalyst is the core of flue gas denitrification technology in coal-fired power plants. During the operation of denitrification catalysts, arsenic poisoning is an important cause of catalyst deactivation. Regenerating the deactivated denitration catalyst to restore its activity can achieve the purpose of catalyst recycling and reduce the cost of catalyst replacement. [0003] CN103894240A discloses a regeneration method of arsenic poisoning selective catalytic reduction denitrification catalyst, including steps: (1) soot blowing: use 2-8MPa, flow rate 0.3-1.0m 3 / s of clean and dry compressed air to blow the deactivated SCR denitrification catalyst to remove the dust on the surface, the time is 10-30min; (2) impregnation: place the catalyst treated i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/60B01J38/70B01J38/64B01J38/48B01J38/02B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J38/02B01J38/485B01J38/60B01J38/64B01J38/70
Inventor 马少丹王宝冬马子然马静何发泉刘子林王红妍李歌林德海孙琦徐文强李永龙
Owner CHNA ENERGY INVESTMENT CORP LTD
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