Regeneration method of arsenic poisoning denitration catalyst

A denitration catalyst, arsenic poisoning technology, applied in catalyst regeneration/reactivation, molecular sieve catalyst, chemical instruments and methods, etc. The effect of expanding industrial use, enhancing activity, and short reaction time

Active Publication Date: 2016-05-04
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
View PDF7 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the method of cleaning and removing arsenic by wet method is relatively popular, but the pickling/alkali washing used in the production process will produce a large amount of acid/alkali wastewater, and more seriously, it

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Regeneration method of arsenic poisoning denitration catalyst
  • Regeneration method of arsenic poisoning denitration catalyst
  • Regeneration method of arsenic poisoning denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using plate type V 2 o 5 -MoO 3 / TiO 2 The denitrification catalyst runs for 24,000 hours in a flue gas environment with high arsenic content, causing it to be poisoned by arsenic.

[0020] Regenerate the arsenic-poisoned denitrification catalyst, the method includes the following steps: first remove the fly ash on the surface of the denitrification catalyst and in the pores, place it in a stainless steel reactor, and feed it with a volumetric space velocity of 500h -1 The synthesis gas of the reactor is raised to 320°C, and the reduction reaction is carried out for 5 hours; the synthesis gas is continued, and the temperature of the reactor is raised to 500°C, and at the same time, 1500ppm of SO is injected into the reactor 2 , carry out the reduction-acidification reaction, and react for 1h to obtain the regenerated denitration catalyst, wherein the synthesis gas includes CO, H 2 , N 2 , CO 2 and CH 4 , CO and H 2 80% of the total.

[0021] The regenerated den...

Embodiment 2

[0024] Design a comparative experiment, carry out the reduction reaction at low temperature and high temperature in turn, but the reduction reaction at high temperature is no longer combined with the acidification reaction, the specific steps are: use the plate V 2 o 5 -MoO 3 / TiO 2 For the denitrification catalyst, first make it run for 24000h in the flue gas environment with high arsenic content to cause arsenic poisoning, first remove the fly ash on the surface of the denitrification catalyst and in the pores, and place it in a stainless steel reactor with a volumetric space velocity of 500h -1The synthesis gas is raised to 320°C in the reactor, and the reduction reaction is carried out for 5 hours; the synthesis gas is continuously fed in, and the temperature of the reactor is raised to 500°C, and after 1 hour of reaction, the regenerated denitration catalyst is obtained, wherein , the synthesis gas includes CO, H 2 , N 2 , CO 2 and CH 4 , CO and H 2 80% of the tota...

Embodiment 3

[0027] Design a comparative experiment, only carry out the reduction reaction at low temperature, do not carry out the reduction-acidification reaction at high temperature, the specific steps are: first put the plate V 2 o 5 -MoO 3 / TiO 2 The denitrification catalyst was operated for 24000h in a flue gas environment with high arsenic content to poison it with arsenic, then remove the fly ash on the surface of the denitrification catalyst and in the pores, and put it in a stainless steel reactor with a volumetric space velocity of 500h -1 The synthesis gas of the reactor is raised to 320°C and reacted for 5 hours to obtain the regenerated denitration catalyst, wherein the synthesis gas includes CO, H 2 , N 2 , CO 2 and CH 4 , CO and H 2 80% of the total.

[0028] Put the regenerated denitration catalyst prepared above into a fixed-bed microreactor for evaluation. The temperature in the reactor is 300°C, and the simulated flue gas composition is NO concentration of 450ppm...

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 discloses a regeneration method of an arsenic poisoning denitration catalyst. The method includes the following steps that after the denitration catalyst is subjected to dust removal, the denitration catalyst is placed in a reactor, 100-10000 h<-1> synthesized gas is introduced, a reduction reaction is conducted at the temperature of 100 DEG C-350 DEG C for 0.5-6 hours, synthesized gas continues being introduced, 100-5000 ppm acid gas is introduced at the temperature of 350 DEG C-550 DEG C for a reduction-acidification reaction, and after the reaction is conducted for 0.5-3 hours, the regenerated denitration catalyst is prepared. The regeneration method has the advantages that the situation that a lot of acidic/alkaline wastewater is generated in the regeneration process through a wet method, and the active component V2O5 of the denitration catalyst is lost can be avoided; the activity of the regenerated denitration catalyst is enhanced; the catalyst does not need to be cleaned with cleaning fluid later, and total energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a regeneration method for an arsenic poisoning denitrification catalyst. Background technique [0002] Selective catalytic reduction (SCR) technology has become the most widely used NOx emission control technology due to its high denitrification efficiency, small footprint, and reliable operation. As the core of SCR denitrification technology, the denitrification catalyst will generally lose its activity after 3 to 4 years of operation and needs to be replaced. However, due to the high cost of the catalyst, the cost accounts for about 40% of the total investment of the denitrification project. It is particularly important to effectively regenerate deactivated catalysts to improve the comprehensive utilization efficiency of denitrification catalysts and reduce the denitrification operating costs of coal-fired power plants. [0003] Arsenic poisoning is one of the most common ...

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
IPC IPC(8): B01J38/10B01J38/04B01J23/92B01J29/90B01J23/28B01J29/48B01J23/30B01J23/34B01J23/22B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/22B01J23/28B01J23/30B01J23/34B01J23/92B01J29/48B01J29/90B01J38/04B01J38/10B01J2523/00B01J2523/47B01J2523/55B01J2523/68B01J2523/69B01J2523/3712B01J2523/41B01J2523/31B01J2523/72
Inventor 黄力王虎李倩于爱华孙丹王晓伟董晓真张捷
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap