Method for cleaning and regenerating SCR denitration catalyst for potassium and sodium poisoning deactivation

A denitration catalyst and cleaning liquid technology, which is applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc. Effect of pore structure, compressive and abrasion strength enhancement, and recovery of activity

Inactive Publication Date: 2016-07-06
北京科林佰德环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst has high activity and anti-sulfur and water resistance at this position, the dust concentration in the flue gas where it is located is high, and the concentration of potassium salt and sodium salt is high, which makes the catalyst easy to wear, easy to block, easy to Under poisoning conditions, the life of the catalyst is only 3-4 years. After 2016, there will be at least 150,000 cubic meters of waste per year. If it is not recycled, it will bring serious resource waste and environmental protection problems.
[0004] In addition, during the operation of SCR denitrification catalyst in biomass power plants, the flue gas contains a large amount of potassium salt and sodium salt, which greatly shortens the service life of the catalyst and increases the operating cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for cleaning and regenerating an SCR denitrification catalyst used for potassium and sodium poisoning deactivation, comprising the steps of:

[0026] (1) Configuration of cleaning solution: Dissolve 10g of tea saponin in 56.7g of deionized water, heat to 45°C, heat and stir evenly, then add 2g of fatty sodium sulfate and 15g of alkane while stirring at a temperature of 45°C. Glycoside, 9g lauramide propyl ammonium oxide, 6g sucrose fatty acid ester, 0.1g disodium ethylenediaminetetraacetic acid, stir evenly, adjust the pH value to 7, until the solution drops to room temperature, continue to stir and add 0.1g of emulsifier OP-10, 0.1g of leveling agent Pingpingjia, and 1g of penetration enhancer JFC, until it is uniform for 60 minutes, the cleaning solution is obtained.

[0027] (2) Get the weight of the cleaning solution 30g in the solution (1) and dilute it in 970g deionized water;

[0028] (3) Configuration of regeneration solution: 25g of sulfuric acid and ...

Embodiment 2

[0035] A method for cleaning and regenerating an SCR denitrification catalyst used for potassium and sodium poisoning deactivation, comprising the steps of:

[0036] (1) Configuration of cleaning solution: Dissolve 12g of tea saponin in 47.1g of deionized water, heat to 42°C, heat and stir evenly, then add 4g of fatty sodium sulfate and 25g of sodium sulfate while stirring at a temperature of 42°C Alkyl glucoside, 5.8g of lauramide propyl ammonium oxide, 2.7g of sucrose fatty acid ester, 0.8g of ethylenediaminetetraacetic acid disodium salt, stir evenly, adjust the pH value to 7.2, and after the solution drops to room temperature, Continue to stir and add 0.6g of emulsifier OP-10, 1g of leveling agent Pingpingjia, and 1g of penetration enhancer JFC until it is uniform for 50 minutes to obtain a cleaning solution.

[0037] (2) Dilute the cleaning solution in the solution (1) in deionized water at 960 °C according to the weight of 40 g;

[0038] (3) Configuration of regeneratio...

Embodiment 3

[0045] A method for cleaning and regenerating an SCR denitrification catalyst used for potassium and sodium poisoning deactivation, comprising the steps of:

[0046] (1) Configuration of cleaning solution: Dissolve 15g of tea saponin in 38.1g of deionized water, heat to 30°C, heat and stir evenly, then add 5g of fatty sodium sulfate and 30g of sodium sulfate while stirring at a temperature of 30°C Alkyl glucoside, 5g of lauramide propyl ammonium oxide, 3g of sucrose fatty acid ester, 1g of ethylenediaminetetraacetic acid disodium salt, stir evenly, adjust the pH value to 7.5, and continue stirring until the solution is down to room temperature. Add 1g of emulsifier OP-10, 0.9g of leveling agent Pingpingjia, and 1g of penetration enhancer JFC, until it is uniform for 50 minutes to obtain a cleaning solution;

[0047] (2) The cleaning solution in the solution (1) is diluted in 950 deionized water according to the weight of 50g;

[0048] (3) Configuration of regeneration solutio...

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PUM

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Abstract

The invention discloses a method for cleaning and regenerating an SCR denitration catalyst for potassium and sodium poisoning deactivation. The method comprises the following steps: preparing a cleaning solution and a regenerating solution, performing ash removal treatment on an SCR denitration catalyst subjected to potassium and sodium poisoning deactivation, adding the deactivated SCR denitration catalyst subjected to ash removal treatment into the cleaning solution for bubbling, performing ultrasonic cleaning, drying, bubbling and cleaning in the regenerating solution, supplementing vanadium components of the deactivated SCR denitration catalyst lost in the cleaning process, drying, calcining, and cooling to room temperature, thereby obtaining the regenerated denitration catalyst. According to the regeneration method disclosed by the invention, potassium and sodium poisoning elements of the deactivation catalyst can be effectively cleaned, and the porous structure of the catalyst is restored. Meanwhile, iron ions and arsenic and mercury ions in the deactivation catalyst can be effectively cleaned, the activity of the deactivated SCR denitration catalyst is effectively restored, the compressive strength and wear strength of the SCR denitration catalyst are improved to a certain degree, and the reusing requirement is met.

Description

technical field [0001] The invention relates to the technical field of deactivated selective catalytic reduction (SCR) denitration catalyst regeneration, in particular to a method for cleaning and regenerating an SCR denitration catalyst deactivated by potassium and sodium poisoning. Background technique [0002] Nitrogen oxides (NOx) are currently one of the most serious air pollutants in China. They are one of the main causes of photoacid rain, chemical smog and smog. They have a huge impact on industrial and agricultural production, traffic operations, human health and the ecological environment. hazards. Ammonia Selective Catalytic Reduction (SCR) is one of the effective ways to reduce NOx emissions. Its denitrification principle uses ammonia as a reducing agent to selectively reduce nitrogen monoxide and nitrogen dioxide into pollution-free nitrogen and water. [0003] At present, vanadium tungsten (molybdenum) titanium catalyst is the most widely used commercially and...

Claims

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Application Information

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IPC IPC(8): B01J38/52B01J38/60B01D53/86B01D53/56
CPCB01J38/52B01D53/8628B01J38/60
Inventor 唐保卫邢岗付勇王兴国常永生
Owner 北京科林佰德环保有限公司
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