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Loosening agent for regeneration of SCR denitration catalyst and preparation method of agent

A technology of denitration catalyst and regeneration process, which is applied in the field of loosening agent and its preparation to achieve the effect of enhancing active material loading and avoiding damage

Inactive Publication Date: 2014-03-12
SUZHOU HUALE AIR POLLUTION CONTROL TECH EXPAND CO LTD
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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 to develop a new loosening agent for improving fly ash and sulfate clogging and alkali metal poisoning. Influence of medium and long time immersion on strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.5% of the total amount of loosening agent sodium lauryl sulfate, heat it to 70°C on a water bath, and add 2% of the total amount of dimethyl sulfoxide when it is cooled to about 40°C, stir and mix well to obtain Solution A; take 1.5% of the total concentrated H 2 SO 4 Dissolve it in deionized water of the prescribed amount, stir evenly to obtain solution B, and keep it warm at 20°C. Slowly add solution B to solution A, stir while adding until it is evenly mixed, then continue to stir for 10 minutes to obtain a regenerated loose agent with a pH value of 6, and keep the loose agent at 20°C for heat preservation.

[0023] Take the honeycomb-shaped catalyst module that has been blocked and deactivated by the power plant for a long time, and then put it into the loose agent for 20 minutes after simple purge with oil-free dry compressed air. Take it out and rinse the loose agent on the surface of the module with deionized water. .

[0024] The fully cleaned catalys...

Embodiment 2

[0026] Weigh cetyl sodium sulfate accounting for 1% of the total amount of loosening agent, heat it to 70°C on a water bath, and add 3% of the total amount of decyl methyl sulfoxide when it is cooled to about 40°C, and stir well to make the mixture even Obtain solution A; Take the concentrated HNO that accounts for 2% of total amount 3 Dissolve it in deionized water of the prescribed amount, stir evenly to obtain solution B, and keep it warm at 60°C. Slowly add solution B to solution A, stir while adding until it is evenly mixed, and then continue to stir for 10 minutes to obtain a regenerated loose agent with a pH value of 5, and keep the loose agent at 60°C for heat preservation.

[0027] Take the honeycomb-shaped catalyst module that has been blocked and deactivated by the power plant for a long time, and then put it into the loose agent for 20 minutes after simple purge with oil-free dry compressed air. Take it out and rinse the loose agent on the surface of the module wit...

Embodiment 3

[0030] Weigh 2% of the total amount of loosening agent sodium lauryl sulfate and heat it to 70°C on a water bath. When it is cooled to about 40°C, add 3% of the total amount of N-dodecyl-2-pyrrolidone, Stir to make the mixture uniform to obtain solution A; take 2% of the total concentrated H 2 SO 4 Dissolve it in deionized water of the prescribed amount, stir evenly to obtain solution B, and keep it warm at 40°C. Slowly add solution B to solution A, stir while adding until it is evenly mixed, then continue to stir for 10 minutes to obtain a regenerated loose agent with a pH value of 5, and keep the loose agent at 40°C for heat preservation.

[0031] Take the honeycomb-shaped catalyst module that has been blocked and deactivated by the power plant for a long time, and then put it into the loose agent for 20 minutes after simple purge with oil-free dry compressed air. Take it out and rinse the loose agent on the surface of the module with deionized water. .

[0032] The fully...

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PUM

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Abstract

The invention discloses a loosening agent for regeneration of a SCR denitration catalyst and a preparation method of the agent. The loosening agent comprises the following components by mass: 0.5%-2% of a wetting agent, 1%-5% of a penetration enhancer, 1.5%-2.5% of a pH conditioning agent and 90.5%-97% of deionized water. The beneficial effects comprise that the loosening agent helps to shorten the immersing time of the catalyst in a cleaning fluid and avoid the influence on the catalyst strength caused by long-time immersing; the loosening agent is capable of replacing apparatuses for physical perforation and avoiding damage to the catalyst; and the loosening agent is beneficial for recovering the acid sites on the catalyst surface because of the weakly acidic system which is also beneficial for the cleaning of the catalyst surface. The loosening agent has relatively high practical value on improvement of catalyst regeneration effect and regenerated catalyst working efficiency and avoiding of physical damage during catalyst regeneration process.

Description

technical field [0001] The invention relates to a loose agent, in particular to a loose agent used in the regeneration process of an SCR denitration catalyst and a preparation method thereof. Background technique [0002] Selective catalytic reduction (SCR) is currently the most effective way to control pollutant nitrogen oxides in coal-fired power plants. Due to its good selectivity, high efficiency and stable operation, this method is gradually being widely adopted by domestic coal-fired power plants. However, the catalyst has long been affected by high dust environment, alkali metals and sulfides, etc., and deactivation is inevitable with the increase of catalyst service time. Generally, the service life of fresh catalyst is 3 to 5 years. There are many reasons for the deactivation of the catalyst, and the common ones are the blockage of fly ash and sulfide, the poisoning of alkali metals and toxic heavy metals, etc. The deactivation and denitrification efficiency of the...

Claims

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Application Information

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IPC IPC(8): B01J38/48
Inventor 俞旸翁卫国吴卫红宋浩余鸿敏王承志
Owner SUZHOU HUALE AIR POLLUTION CONTROL TECH EXPAND CO LTD
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