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Ozone treatment regeneration method and device for vanadium titanium-based flue gas denitration catalyst

A denitrification catalyst and ozone treatment technology, which is applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as catalyst activity decline, and achieve low regeneration costs, good environmental benefits and economic benefits , Improve the effect of denitrification activity

Inactive Publication Date: 2011-07-27
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analysis of the surface of flue gas catalysts in a domestic thermal power plant that has been in operation for 29,700 hours shows that there are carbon deposits and sulfates on the surface of such catalysts, and the presence of these substances leads to a decline in catalyst activity

Method used

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  • Ozone treatment regeneration method and device for vanadium titanium-based flue gas denitration catalyst
  • Ozone treatment regeneration method and device for vanadium titanium-based flue gas denitration catalyst
  • Ozone treatment regeneration method and device for vanadium titanium-based flue gas denitration catalyst

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Experimental program
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Effect test

Embodiment 1

[0036] The ozone regeneration method is used to regenerate the deactivated honeycomb flue gas catalyst. First, the honeycomb catalyst is placed in the flue gas denitration catalyst regeneration reaction bed. At 15°C, an air-ozone mixed gas with an ozone concentration of 60mg / L is used at a flow rate of 1m / min, and enters the reaction bed through a four-way valve. Change the flow direction of the ozone-air mixed gas through the four-way valve at intervals of 10 minutes, so that the mixed gas flows alternately in forward and countercurrent directions. After 60 minutes of oxidation treatment, turn off the ozone generator to complete the regeneration process of the flue gas denitrification catalyst.

Embodiment 2

[0038] The ozone regeneration method is used to regenerate the deactivated honeycomb flue gas catalyst. First, the honeycomb catalyst is placed in the flue gas denitration catalyst regeneration reaction bed. At 15°C, an air-ozone mixed gas with an ozone concentration of 100mg / L is used at a flow rate of 1.5m / min, and enters the reaction bed through a four-way valve. During the period, change the flow direction of the ozone-air mixed gas through the four-way valve at intervals of 10 minutes, so that the mixed gas flows alternately in forward and countercurrent directions. After oxidizing for 60 minutes, turn off the ozone generator to complete the regeneration process of the flue gas denitrification catalyst.

Embodiment 3

[0040] The ozone regeneration method is used to regenerate the deactivated honeycomb flue gas catalyst. First, the honeycomb catalyst is placed in the flue gas denitration catalyst regeneration reaction bed. At 15°C, an air-ozone mixed gas with an ozone concentration of 140mg / L is used at a flow rate of 2.5m / min, and enters the reaction bed through a four-way valve. During the period, change the flow direction of the ozone-air mixed gas through the four-way valve at intervals of 10 minutes, so that the mixed gas flows alternately in forward and countercurrent directions. After oxidizing for 60 minutes, turn off the ozone generator to complete the regeneration process of the flue gas denitrification catalyst.

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Abstract

The invention discloses an ozone treatment regeneration method and an ozone treatment regeneration device for a vanadium titanium-based flue gas denitration catalyst. The method comprises the following steps of: filling an inactivated flue gas denitration catalyst into a catalyst regeneration reaction bed; introducing ozone-air mixed gas into the catalyst regeneration reaction bed; and finishing the catalyst regeneration process after oxidation. The ozone treatment regeneration device for the vanadium titanium-based flue gas denitration catalyst comprises an ozone generator, a four-way valve,the catalyst regeneration reaction bed and an ozone exhaust catalytic decomposition treatment device, wherein four connecting ports of the four-way valve are connected with two ends of the catalyst regeneration reaction bed, the ozone generator and the ozone exhaust catalytic decomposition treatment device through pipelines respectively; the flow direction of the ozone-air mixed gas is changed byadjusting the four-way valve; and MnO2-CO3O4 / TiO2 is filled into the ozone exhaust catalytic decomposition treatment device, and the exhaust is decomposed in the ozone exhaust catalytic decompositiontreatment device.

Description

technical field [0001] The invention relates to a regeneration method and a device for a catalyst, in particular to a regeneration method and a device for a vanadium-titanium-based flue gas denitrification catalyst. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants and the main substance that forms acid rain and photochemical smog. Coal-fired thermal power plants are one of the main sources of nitrogen oxide emissions. Among various nitrogen oxide control technologies, selective catalytic reduction (abbreviation: SCR) is currently the most widely used and most mature and effective flue gas denitrification technology. Law. [0003] The catalysts currently used in SCR are mostly TiO 2 as the carrier, V 2 o 5 , V 2 o 5 -WO 3 or V 2 o 5 -MoO 3 It is the active main part, and there are three types: honeycomb type, plate type and corrugated type. Commercial SCR flue gas denitrification catalysts are expensive (about 50,000 yuan / m ...

Claims

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Application Information

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IPC IPC(8): B01J38/12B01J23/16B01J23/22B01J23/30B01J23/28B01D53/86B01D53/96B01D53/56
Inventor 李忠段竞芳夏启斌吴凡
Owner SOUTH CHINA UNIV OF TECH
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