Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

A kind of regeneration method of arsenic poisoning SCR denitrification catalyst

A denitrification catalyst and arsenic poisoning technology, which is applied in the field of environmental protection technology and denitrification catalysis, can solve the problems of active component dissolution and loss, catalyst high-temperature sintering, catalyst secondary poisoning, etc., and achieve the effect of specific surface area recovery, catalytic activity recovery, and optimized ratio

Active Publication Date: 2020-04-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Looking at the existing arsenic poisoning catalyst regeneration methods, it can be found that the wet regeneration technology has a relatively excellent arsenic removal effect, but it is often accompanied by the secondary poisoning of the catalyst and the loss of a large amount of active components; thermal reduction regeneration can be very good Avoid the above shortcomings, but the existing thermal reduction regeneration process needs to be carried out at extremely high temperature, so there are also phenomena such as high-temperature sintering of the catalyst and destruction of active sites

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 has described a kind of regeneration method of arsenic poisoning SCR denitrification catalyst, and its specific steps include:

[0023] (1) Select the arsenic-poisoned vanadium-molybdenum-titanium honeycomb SCR denitrification catalyst, firstly perform mechanical deashing on it, and then blow it with 2Mpa clean and dry compressed air for 1 hour to remove the ash accumulation on the surface of the catalyst and in the pores, and cut it to a height of 60mm 5×5-hole catalyst block, then soak it in sufficient deionized water, and at the same time pass through the ozone-air mixture with an ozone concentration of 80mg / L, and clean it with ultrasonic vibration at 40°C for 20min;

[0024] (2) Move the catalyst treated in step (1) to a sufficient amount of pre-prepared 0.25mol / L monoethanolamine solution for soaking and cleaning for 40 minutes, and intermittently stir during the cleaning process;

[0025] (3) Rinse the catalyst treated in step (2) repeatedly with deion...

Embodiment 2

[0029] Embodiment 2 has also described a kind of regeneration method of arsenic poisoning SCR denitrification catalyst, and its specific steps include:

[0030] (1) Select the arsenic-poisoned vanadium-molybdenum-titanium honeycomb SCR denitrification catalyst, firstly perform mechanical deashing on it, and then blow it with 2Mpa clean and dry compressed air for 1 hour to remove the ash accumulation on the surface of the catalyst and in the pores, and cut it to a height of 60mm 5×5-hole catalyst block, then soak it in sufficient deionized water, and at the same time pass through the ozone-air mixture with an ozone concentration of 80mg / L, and clean it with ultrasonic vibration at 40°C for 20min;

[0031] (2) Move the catalyst treated in step (1) to a sufficient amount of pre-prepared 0.5mol / L monoethanolamine solution for immersion and cleaning for 30 minutes, and perform intermittent stirring during the cleaning process;

[0032] (3) Rinse the catalyst treated in step (2) rep...

Embodiment 3

[0036] Embodiment 3 also describes a regeneration method of an arsenic poisoning SCR denitration catalyst, and its specific steps include:

[0037] (1) Select the arsenic-poisoned vanadium-molybdenum-titanium honeycomb SCR denitrification catalyst, firstly perform mechanical deashing on it, and then blow it with 2Mpa clean and dry compressed air for 1 hour to remove the ash accumulation on the surface of the catalyst and in the pores, and cut it to a height of 60mm 5×5 hole catalyst block, then soak it in a sufficient amount of deionized water, and at the same time pass through the ozone-air mixture with an ozone concentration of 120mg / L, and clean it with ultrasonic vibration at 40°C for 16min;

[0038] (2) Move the catalyst treated in step (1) to a sufficient amount of pre-prepared 0.75mol / L monoethanolamine solution for soaking and cleaning for 20 minutes, and intermittently stir during the cleaning process;

[0039] (3) Rinse the catalyst treated in step (2) repeatedly wit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the fields of environmental protection technology and catalytic denitration, and specifically relates to a regeneration method for an arsenic poisoning SCR denitration catalyst. This invention first blows soot and removes impurities from the arsenic poisoned SCR denitrification catalyst, then uses deionized water to carry out ultrasonic cleaning under the condition of introducing ozone-air mixed gas, and then uses a weak alkaline solution to soak and clean, and then uses different reduction methods. The chemical gas is subjected to two-stage gradient reduction at different temperatures, and finally the regenerated catalyst is obtained through rapid temperature rise and roasting in air. After using the method of the present invention to regenerate the SCR denitration catalyst for arsenic poisoning, the denitrification efficiency returns to the level of the fresh catalyst, the arsenic removal rate reaches more than 99%, and the ability of the regenerated catalyst to resist arsenic poisoning is greatly improved. In addition, the method in the present invention is simple in process, has strong operability, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of environmental protection technology and denitrification catalysis, and in particular relates to a regeneration method of an arsenic poisoning SCR denitrification catalyst. Background technique [0002] Selective catalytic reduction (SCR) denitrification method has the advantages of high denitrification efficiency, good selectivity and perfect technology, and is currently the most widely used flue gas denitrification technology. Catalyst is the core of SCR denitrification technology, and its performance directly affects the overall denitrification effect of the SCR system. However, in the actual use process, due to the very harsh working environment, the catalyst is deactivated due to wear, clogging, poisoning or sintering, etc., resulting in a significant reduction in denitration efficiency. When the catalyst cannot meet the overall denitration performance requirements of the SCR system, it is necessary to timely ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/92B01J35/04B01J38/14B01J38/64B01J38/66B01J38/04B01J38/10B01J38/02B01D53/88B01D53/56
CPCB01D53/565B01D53/8628B01D53/88B01J23/002B01J23/92B01J38/02B01J38/04B01J38/10B01J38/14B01J38/64B01J38/66B01D2258/0283B01D2257/40B01J2523/00B01J35/56B01J2523/47B01J2523/52B01J2523/55B01J2523/68
Inventor 陆强唐昊李慧杨江毅李文艳董长青杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com