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Closed cleaning device and method for inactivate SCR denitration catalyst and regeneration system and method

A technology for denitration catalyst and cleaning device, which is applied in catalyst regeneration/reactivation, chemical instruments and methods, catalyst activation/preparation, etc., and can solve the problems of high catalyst cost, increased denitration cost, environmental pollution, etc.

Inactive Publication Date: 2016-03-02
FUJIAN ZIJIN ENVIRONMENT ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the mature and reliable selective catalytic reduction (SCR) denitrification technology, SCR denitrification technology has always occupied a large market share, but the cost of the catalyst is too high, and the service life of the general commercial catalyst is 3-5 years. Directly replacing the catalyst will greatly increase its denitrification cost, and at the same time, the waste catalyst produced will pollute the environment because it contains heavy metals and other components. Therefore, it is of great significance to study the regeneration of SCR denitrification catalysts.

Method used

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  • Closed cleaning device and method for inactivate SCR denitration catalyst and regeneration system and method
  • Closed cleaning device and method for inactivate SCR denitration catalyst and regeneration system and method
  • Closed cleaning device and method for inactivate SCR denitration catalyst and regeneration system and method

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Experimental program
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Effect test

Embodiment 1

[0063] go through Figure 1-3 The method and system shown can achieve a denitrification activity of 18Nm / h and a specific surface area of ​​41.2m 2 The regeneration treatment of the catalyst (referred to as deactivated catalyst A) of / g:

[0064] (1) Deactivated catalyst A is placed in the purge tank and is purged with clean air with a pressure of 0.55MPa for 20min;

[0065] (2) The catalyst after (1) treatment is placed in a closed cleaning device and cleaned for 22 minutes by the microbubble burst impact cleaning method (wherein, the ultrasonic frequency is 35KHz, and the flow rate of the air pump is 0.6m 3 / h), and then use an ultrasonic nebulizer to clean in a semi-dry method for 26min under a micro-negative pressure environment (wherein, the atomization rate of the ultrasonic nebulizer is 0.3L / min, and the carrier gas flow rate is 2.5m 3 / h, the frequency of the ultrasonic atomizer is 2.5MHz), and then wash with acid dipping for 6min under ultrasonic conditions, and fin...

Embodiment 2

[0073] go through Figure 1-3 The method and system shown can achieve a denitrification activity of 25Nm / h and a specific surface area of ​​37.8m 2 The regeneration treatment of the catalyst (referred to as deactivated catalyst B) of / g:

[0074] (1) Place the deactivated catalyst B in the purge tank and use the clean air with a pressure of 0.45MPa to purge for 15min;

[0075] (2) Place the catalyst after (1) treatment in a closed cleaning device and clean it for 20 minutes with the microbubble burst impact cleaning method (wherein, the ultrasonic frequency is 35KHz, and the flow rate of the air pump is 0.5m 3 / h), and then use an ultrasonic nebulizer to clean in a semi-dry method for 25 minutes under a micro-negative pressure environment (wherein, the atomization rate of the ultrasonic nebulizer is 0.1L / min, and the carrier gas flow rate is 1.5m 3 / h, the frequency of the ultrasonic nebulizer is 4.0MHz), then soak and wash with acid for 7min under ultrasonic conditions, and...

Embodiment 3

[0083] go through Figure 1-3 The method and system shown can achieve a denitrification activity of 20Nm / h and a specific surface area of ​​45.4m 2 The regeneration treatment of the catalyzer (recorded as deactivated catalyst C) of / g:

[0084] (1) The deactivated catalyst C is placed in the purge tank and is purged with clean air with a pressure of 0.4MPa for 15min;

[0085] (2) Place the catalyst treated in (1) in an airtight cleaning device and clean it for 20 minutes with the microbubble burst impact cleaning method (wherein, the ultrasonic frequency is 35KHz, and the flow rate of the air pump is 0.7m 3 / h), and then use an ultrasonic nebulizer to clean for 20 minutes in a semi-dry method under a micro-negative pressure environment (wherein, the atomization rate of the ultrasonic nebulizer is 0.9L / min, and the carrier gas flow rate is 4.5m 3 / h, the frequency of the ultrasonic atomizer is 1.0MHz), and then wash with acid dipping for 10min under ultrasonic conditions, and...

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Abstract

The invention relates to a closed cleaning device and method for an inactive SCR denitration catalyst and a regeneration system and method. The closed cleaning device comprises a cleaning body box, an ultrasonic atomizer, an ultrasonic washing machine, a microbubble generator, a catalyst cleaning rotary plate and a micro negative-pressure suction device. The regeneration method includes the following steps that firstly, air blowing and sweeping are carried out; secondly, the inactivative SCR denitration catalyst is flushed and processed through running water by means of the microbubble explosive burst impact cleaning method, semi-dry method cleaning and acid steeping cleaning; thirdly, drying is carried out; fourthly, regeneration and activation are conducted to obtain a regenerated denitration catalyst. Regeneration of the inactive catalyst can be achieved. Compared with the common regeneration technology, cleaning achieved through the technology is thorough. Meanwhile, the utilization rate of a cleaning solution can be greatly increased, and the surface and the porous structure of the inactive catalyst can be restored to the largest extent.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, and in particular relates to an airtight cleaning device and method for an inactivated SCR denitration catalyst, as well as a regeneration system and method. Background technique [0002] The rapid development of industrialization has also exacerbated the deterioration of the environment. Environmental problems such as smog are becoming more and more serious. With the implementation of the "Twelfth Five-Year Plan" emission reduction task, the national nitrogen oxide emission standards have become stricter, and the development of denitrification technology has been accelerated. . Due to the mature and reliable selective catalytic reduction (SCR) denitrification technology, SCR denitrification technology has always occupied a large market share, but the cost of the catalyst is too high, and the service life of the general commercial catalyst is 3-5 years. Directly replacing the catal...

Claims

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Application Information

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IPC IPC(8): B01J38/60B01J38/48B01J38/00
CPCB01D53/565B01D53/96B01J37/06B01J38/00B01J38/48B01J38/60B01J38/66
Inventor 杨广华王洪明黄丽明余立清赖永花
Owner FUJIAN ZIJIN ENVIRONMENT ENG TECH
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