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SCR denitrification catalyst regeneration method and mixture for SCR denitrification catalyst regeneration liquid

A denitrification catalyst and regeneration solution technology, applied in the field of electric power environmental protection, can solve the problems of active material loss, high regeneration cost, loss of catalyst active material, etc., achieve the effect of improving regeneration performance, reducing regeneration cost, and eliminating supplementary processes

Inactive Publication Date: 2013-10-16
张权 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above regeneration idea can effectively restore the denitrification activity of the poisoned catalyst, there are still the following problems: (1) Sulfuric acid impregnation can effectively remove the K on the surface of the catalyst + and Na + , but for alkaline earth metal ions such as Mg 2+ , Ca 2+ etc. removal effect is not ideal; at the same time, the acid solution can dissolve V 2 o 5 and WO 3 , can lead to the loss of catalyst active substances, and the greater the acid concentration, the more serious the loss of active substances in the catalyst after pickling, which is in the literature (Jung Bin Lee, Seong Keun Kim, Dong Wha Kim, et al.Korean J.Chem. Eng., 2012, 29 (2): 270~276) and patent US7592283 are all confirmed; (2) the price of active material precursor ammonium metatungstate is higher, which is the main factor affecting the production cost of SCR catalyst. Therefore, supplement Active substances can significantly increase the regeneration cost of the catalyst and also increase the complexity of the regeneration process operation
In short, the above problems lead to potential problems such as the regeneration performance of the existing SCR catalyst regeneration technology needs to be improved, and the regeneration cost is high, which is not conducive to engineering application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) A poisoned SCR catalyst (V 2 o 5 -WO 3 / TiO 2 type, wall thickness: 0.7mm, pitch: 6.8mm), cut into small pieces of 35mm×35mm×90mm, and blow with oil-free dry compressed air (0.5MPa) for 10 minutes to remove the dust on the surface of the catalyst; then The purged catalyst was submerged in deionized water and ultrasonically pretreated for 10 minutes to remove dust in the fine pores, and then rinsed with a water spray gun.

[0030] (2) Put the catalyst treated in step (1) into 500ml of regenerating solution composed of 1wt% sulfuric acid, 5wt% ammonium chloride and 0.8wt% ethylenediaminetetraacetic acid, and soak for 2 hours at normal temperature and pressure.

[0031] (3) The catalyst treated in step (2) is dried and calcined according to the following heating regime: room temperature → 150° C. / 2 hours → 400° C. / 4 hours, and the heating rate is not greater than 3° C. / min. Regeneration ends.

[0032] The poisoned and regenerated catalysts were respectively placed...

Embodiment 2

[0035] (1) A poisoned SCR catalyst (V 2 o 5 -WO 3 / TiO 2type, wall thickness: 0.7mm, pitch: 6.8mm), cut into small pieces of 35mm×35mm×90mm, and blow with oil-free dry compressed air (0.5MPa) for 10 minutes to remove the dust on the surface of the catalyst; then The purged catalyst was submerged in deionized water and ultrasonically pretreated for 10 minutes to remove dust in the fine pores, and then rinsed with a water spray gun.

[0036] (2) Put the catalyst treated in step (1) into 500ml of regenerating solution composed of 2wt% sulfuric acid, 3wt% ammonium chloride and 0.5wt% ethylenediaminetetraacetic acid, and soak for 2 hours at normal temperature and pressure.

[0037] (3) The catalyst treated in step (2) is dried and calcined according to the following heating regime: room temperature → 150° C. / 2 hours → 400° C. / 4 hours, and the heating rate is not greater than 3° C. / min. Regeneration ends.

[0038] The poisoned and regenerated catalysts were respectively placed ...

Embodiment 3

[0041] (1) A poisoned SCR catalyst (V 2 o 5 -WO 3 / TiO 2 type, wall thickness: 0.7mm, pitch: 6.8mm), cut into small pieces of 35mm×35mm×90mm, and blow with oil-free dry compressed air (0.5MPa) for 10 minutes to remove the dust on the surface of the catalyst; then The purged catalyst was submerged in deionized water and ultrasonically pretreated for 10 minutes to remove dust in the fine pores, and then rinsed with a water spray gun.

[0042] (2) Put the catalyst treated in step (1) into 500ml of regeneration solution composed of 1wt% nitric acid, 4wt% ammonium chloride and 0.6wt% nitrilotriacetic acid, and soak for 2 hours at normal temperature and pressure.

[0043] (3) The catalyst treated in step (2) is dried and calcined according to the following heating regime: room temperature → 150° C. / 2 hours → 400° C. / 4 hours, and the heating rate is not greater than 3° C. / min. Regeneration ends.

[0044] The poisoned and regenerated catalysts were respectively placed in the SCR ...

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PUM

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Abstract

The present invention provides a mixture for a SCR denitrification catalyst regeneration liquid, and a method for carrying out SCR denitrification catalyst regeneration by using the regeneration liquid. With the present invention, a regeneration performance of the catalyst can be effectively increased, an active substance supplement process can be eliminated, a regeneration cost is effectively reduced, and a regeneration process is simplified.

Description

technical field [0001] The invention relates to the technical field of electric power environmental protection, in particular to a method for regenerating a honeycomb-type selective catalytic reduction (SCR) denitration catalyst and a mixture used for regeneration liquid of the SCR denitration catalyst. Background technique [0002] The emission control of nitrogen oxides (NOx) from coal-fired power plants is a key task in the field of energy conservation and environmental protection during the country's "Twelfth Five-Year Plan". Formulated the most stringent control standard in the world (100mg / m 3 ). With the promulgation of these national policies, how to effectively control NOx emissions has become one of the important issues to be solved in the field of power environmental protection. [0003] At present, the flue gas denitrification (DeNOx) of coal-fired power plants mainly adopts selective catalytic reduction (SCR) technology. This technology uses ammonia as the re...

Claims

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Application Information

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IPC IPC(8): B01J38/48B01J38/60B01J38/66B01J38/50B01D53/90B01D53/56
Inventor 张权张一彤王涛王勇
Owner 张权
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