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Cleaning liquid for regenerating denitration catalyst and cleaning method

A denitrification catalyst and cleaning solution technology, applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of reducing usage, prolonging catalyst life, and reducing regeneration costs

Active Publication Date: 2014-11-26
LUOYANG HAOHAI IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a cleaning solution and a cleaning method for the regeneration of the denitration catalyst in view of the disadvantages of the regeneration of the denitration catalyst in the background technology, which can significantly increase the number of active centers of the SCR catalyst and improve the life of the SCR catalyst. Simultaneously removes arsenic, lead, and mercury clogged on the catalyst

Method used

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  • Cleaning liquid for regenerating denitration catalyst and cleaning method

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Effect test

Embodiment 1

[0017] In the cleaning device, prepare the cleaning solution: use deionized water as solvent, add 0.5wt% surfactant polyoxyethylene ether and 5wt% selective heavy metal scavenger HMCA-1; buffer solution is ammonium hydrogen phthalate-dilute Sulfuric acid, the preparation method is to mix 25.0mL of ammonium hydrogen phthalate solution with a concentration of 0.2 mol / L and 800mL of dilute sulfuric acid with a concentration of 0.1 mol / L, and dilute with water until the pH value is 4.5; The operation procedure of washing with cleaning ingredients and finally rinsing with acid buffer solution is to wash 3 times with high-pressure deionized water, then wash in ultrasonic equipment with cleaning solution for 0.1h, and finally wash in ultrasonic equipment with acid buffer solution for 6h. The selective heavy metal scavenger HMCA-1 is selected from the heavy metal scavenger produced by Suzhou Sujing Environmental Protection Technology Co., Ltd.

Embodiment 2

[0019] In the cleaning device, prepare the cleaning solution: take deionized water as solvent, add 0.01wt% surfactant polyoxyethylene ether and 1wt% selective heavy metal scavenger HMCA-1; the buffer solution is oxalic acid-ammonium oxalate, and the preparation method is Mix 25.0mL of oxalic acid solution with a concentration of 0.2 mol / L and 17.5mL of ammonium oxalate with a concentration of 0.1 mol / L, and dilute with water until the pH value is 5.5. The operation procedure of washing is to wash 4 times with high-pressure deionized water, then wash in ultrasonic equipment with cleaning solution for 6 hours, and finally wash in ultrasonic equipment with acid buffer solution for 0.1 hour. The selective heavy metal scavenger HMCA-1 is selected from the heavy metal scavenger produced by Suzhou Sujing Environmental Protection Technology Co., Ltd.

Embodiment 3

[0021] In the cleaning device, prepare the cleaning solution: take deionized water as solvent, add 1wt% surfactant polyoxyethylene ether and 10wt% selective heavy metal scavenger HMCA-1; buffer solution is hexamethylenetetramine-sulfuric acid, The preparation method is: dissolve 40g of hexamethylenetetramine in 200mL of water, add 10mL of dilute sulfuric acid with a concentration of 0.1 mol / L, and then dilute with water until the pH value is 5; the cleaning method is as follows: washing with water first, then washing with cleaning solution, and finally acid buffering The operation procedure of solution washing is to wash 5 times with high-pressure deionized water, then wash in ultrasonic equipment with cleaning solution for 1 hour, and finally wash in ultrasonic equipment with acidic buffer solution for 5 hours. The selective heavy metal scavenger HMCA-1 is selected from the heavy metal scavenger produced by Suzhou Sujing Environmental Protection Technology Co., Ltd.

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Abstract

The invention discloses a cleaning liquid for regenerating a denitration catalyst. The cleaning liquid comprises a cleaning solution and a buffering solution, wherein the cleaning solution is formed by adding 1-10% of selective heavy metal catching agent HMCA-1 and 0.01-1% of polyoxyethylene ether non-ion surfactant into deionized water serving as a solvent; and the buffering solution is an orthophthalic hydrogen phthalate-dilute sulphuric acid solution, a hexamine-sulfuric acid solution, a sulfuric acid-ammonium sulfate solution, a phosphoric acid-ammonium monohydric phosphate or an oxalic acid-ammonium oxalate solution. The invention also discloses a method for cleaning a failed catalyst by using the cleaning liquid. The heavy metal catching agent HMCA-1 adopted by the cleaning liquid has an effect of selectively catching arsenic, mercury, calcium, beryllium, barium, magnesium, iron and the like on the surface of the catalyst; in addition, by virtue of the buffering solution, the quantity of Bronsted acid-acid sites of an SCR catalyst is greatly increased, so that a relatively small amount of ammonium metavanadate only needs to be added into a subsequent regenerated liquid; and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of denitrification catalyst (SCR) regeneration, in particular to a cleaning solution and a cleaning method for denitrification catalyst regeneration in coal-fired power plants. Background technique [0002] The Ministry of Environmental Protection of the People's Republic of China has released the draft of the "Guidelines for the Regeneration and Treatment of Waste Flue Gas Denitrification Catalysts". Landfill Pollution Control Standards (GB-8598) require landfill. Encourage the development and application of high-performance catalyst raw materials, new catalysts, regeneration of spent catalysts and safe disposal technologies. Under normal circumstances, a 300MW unit, after completing the "2+1" layout and loading catalyst, has an average annual waste catalyst of 100 m3, which will cause environmental pollution if it is landfilled, and the catalyst will be restored to 95% of its original activity by regenera...

Claims

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Application Information

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IPC IPC(8): B01J38/52B01J38/60
Inventor 剧长生王银和王占修徐兵兵尚志兵姜建利赵芳莉
Owner LUOYANG HAOHAI IND & TRADE
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