Dry regeneration method of spent scr denitrification catalyst by plasma treatment

A denitration catalyst and plasma technology, which is applied in the field of regeneration of expired SCR denitration catalysts, can solve the problems of loss of active substances, large amount of sewage treatment, loss of active components, etc. Effect

Inactive Publication Date: 2018-10-09
FUJIAN ZIJIN ENVIRONMENT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although sulfuric acid immersion cleaning can remove the alkali metal ions on the surface of the catalyst, the removal effect of alkaline earth metal ions is poor; the V in the SCR denitration catalyst 2 o 5 、WO 3 Such active components can dissolve in the cleaning solution, causing further loss of active substances and affecting the mechanical strength of the catalyst; in addition, sulfuric acid impregnation and cleaning will generate a large amount of waste water, which must be treated to avoid secondary pollution, which is uneconomical and Not environmentally friendly; at the same time, using the active regeneration liquid impregnation process, the active liquid utilization rate is low, the effect is not good, and the regeneration cost is high
[0005] Many of the above problems have seriously affected the development and engineering application of the regeneration technology of invalid SCR denitrification catalysts.
In order to solve the above-mentioned problems such as large amount of sewage treatment, easily affected mechanical strength, loss of active components, incomplete regeneration, and high cost, it is imperative to study a new regeneration process

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  • Dry regeneration method of spent scr denitrification catalyst by plasma treatment

Examples

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Embodiment 1

[0043] like figure 1 As shown, this embodiment discloses a dry regeneration process using plasma to treat the spent SCR denitrification catalyst. A honeycomb-type invalid SCR denitration catalyst with a size of 150mm×150mm×900mm was taken, and its denitration activity was detected to be 19Nm / h, and the specific surface area was 40.9m 2 / g (sample 1), the regeneration process is as follows:

[0044] The sample 1 was continuously purged with 0.5MPa compressed air for 3 hours to remove the loose matter on the surface. Establish a vacuum degree of 100Pa, the working gas is Ar and H 2The sample 1 after purging was transferred to the plasma atmosphere to perform plasma dry cleaning. Configure catalyst regeneration active liquid: ammonium metavanadate 0.9wt%, ammonium paratungstate 10.6wt%, penetrant 0.08wt%, surfactant 0.08wt%, complexing agent 0.08wt%, oxalic acid 6.4wt%, and the balance of deionization water. The regeneration active liquid and compressed air are atomized and ...

Embodiment 2

[0047] like figure 1 As shown, this embodiment discloses a dry regeneration process using plasma to treat the spent SCR denitrification catalyst. Take a honeycomb-type invalid SCR denitrification catalyst with a size of 150mm×150mm×900mm, and its denitrification activity is 20Nm / h, and its specific surface area is 41.3m 2 / g (sample 2), the regeneration process is as follows:

[0048] Blow sample 2 with 0.6MPa shock wave for 2 hours, and then use 0.5MPa compressed air to blow sample 2 continuously for 1 hour to remove loose substances on the surface. Establish a vacuum degree of 300Pa, the working gas is Ar and H 2 The sample 2 after purging was transferred to the plasma atmosphere to perform plasma dry cleaning. Configure catalyst regeneration active liquid: ammonium metavanadate 1.1wt%, ammonium paratungstate 6.6wt%, penetrant 0.05wt%, surfactant 0.05wt%, complexing agent 0.05wt%, oxalic acid 5.2wt%, and the balance of deionization water. The regeneration active liquid ...

Embodiment 3

[0051] like figure 1 As shown, this example discloses a dry regeneration process using plasma treatment of a spent SCR denitrification catalyst. A honeycomb-type spent SCR denitrification catalyst with a size of 150mm×150mm×900mm is taken, and its denitrification activity is 19Nm / h, and its specific surface area is 39.4m 2 / g (sample 3), the regeneration process is as follows:

[0052] The sample 3 was purged with 0.5MPa shock wave for 1 hour, and then the sample 3 was continuously purged with 0.5MPa compressed air for 2 hours to remove the loose substances on the surface. Establish a vacuum degree of 400Pa, the working gas is Ar and H 2 Plasma atmosphere, the sample 3 after purging was transferred into the plasma atmosphere for plasma dry cleaning. Configure catalyst regeneration active solution: 0.8wt% ammonium metavanadate, 5.5wt% ammonium paratungstate, 1wt% penetrating agent, 1wt% surfactant, 0.09wt% complexing agent, 8.4wt% oxalic acid, and deionized water in balance....

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Abstract

The invention discloses a dry regeneration method that uses plasma to treat failed SCR denitration catalysts, applies the plasma cleaning method to the cleaning of failed SCR denitration catalysts, and then uses gas-liquid two-phase two-fluid atomization spray technology to atomize and coat active substances. On the cleaned surface of the catalyst, subsequent hot air drying and calcination processes will turn the coated active material into oxides to form the active material of the catalyst. The invention has high regeneration efficiency, low cost and strong environmental protection. Among them, plasma dry cleaning can achieve efficient and deep cleaning without destroying physical properties, and completely avoids the problem of waste water treatment.

Description

technical field [0001] The invention belongs to the field of regeneration of spent SCR denitrification catalysts, and in particular relates to a dry regeneration method using plasma to treat the spent SCR denitrification catalysts. Background technique [0002] Nowadays, air pollution is becoming more and more serious, among which nitrogen oxides (NO x ) are particularly dangerous. Selective catalytic reduction (SCR) denitrification technology is widely used because of its high efficiency and maturity. The SCR denitrification catalyst is the core component of the denitrification system, and its initial investment accounts for a relatively high proportion of the total investment. With the operation of the system, the activity of the catalyst gradually decreases. If it is replaced directly, the cost of denitrification will not only increase, but also produce hazardous solid waste that is extremely poisonous to the human body and the environment. Therefore, it is of far-reac...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J38/00B01J38/04B01J38/10B01J38/48B01J35/10B01J23/30B01D53/96B01D53/88B01D53/56
CPCB01D53/565B01D53/8628B01D53/88B01D53/96B01J23/30B01J38/00B01J38/04B01J38/10B01J38/485B01D2258/0283B01J35/613
Inventor石磊
OwnerFUJIAN ZIJIN ENVIRONMENT ENG TECH