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Green cyclic utilization method of honeycomb type denitration catalyst

A denitration catalyst and honeycomb technology, which are applied in the field of green recycling of honeycomb denitration catalysts, can solve the problems of large water consumption, large amount of waste water, high energy consumption, etc. Effect

Active Publication Date: 2021-03-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still uses high-energy calcification roasting, the recovery process consumes a lot of water and produces a large amount of wastewater, and the recovery of titanium uses ammonia recrystallization process. After recrystallization, the specific surface of titanium dioxide is greatly reduced, and it cannot be used for catalyst preparation after recrystallization.

Method used

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  • Green cyclic utilization method of honeycomb type denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0040] A method for green recycling of a honeycomb denitrification catalyst. Two process routes of regeneration and re-preparation arranged side by side are arranged, and a regeneration process or a re-preparation process is selected according to the performance of the waste honeycomb denitrification catalyst to implement green recycling; the regeneration process and The basis for the selection of the re-preparation process is: the axial and radial compressive strengths of the waste honeycomb denitration catalyst are ≥1.0 and ≥0.2MPa respectively, and the specific surface area is ≥40.0m 2 / g, the regeneration process route is selected; otherwise, the re-production process route is selected.

[0041] The regeneration process is as follows:

[0042] (1) Purge: Use air to purge the surface and channels of the spent catalyst, and the air pressure is 0.3 MPa; further use sound waves to detect the situation of purge dead ends and blocked holes, and when the blocked holes are found, ...

Embodiment example 2

[0064] A method for green recycling of a honeycomb denitrification catalyst. Two process routes of regeneration and re-preparation arranged side by side are arranged, and a regeneration process or a re-preparation process is selected according to the performance of the waste honeycomb denitrification catalyst to implement green recycling; the regeneration process and The basis for the selection of the re-preparation process is: the axial and radial compressive strengths of the waste honeycomb denitration catalyst are ≥1.0 and ≥0.2MPa respectively, and the specific surface area is ≥40.0m 2 / g, the regeneration process route is selected; otherwise, the re-production process route is selected.

[0065] The regeneration process is as follows:

[0066] (1) Purge: use air to purge the surface and channels of the spent catalyst, and the air pressure is 0.4MPa; further use sound waves to detect the situation of purge dead ends and blocked holes, and when the blocked holes are found, u...

Embodiment example 3

[0088] A method for green recycling of a honeycomb denitrification catalyst. Two process routes of regeneration and re-preparation arranged side by side are arranged, and a regeneration process or a re-preparation process is selected according to the performance of the waste honeycomb denitrification catalyst to implement green recycling; the regeneration process and The basis for the selection of the re-preparation process is: the axial and radial compressive strengths of the waste honeycomb denitration catalyst are ≥1.0 and ≥0.2MPa respectively, and the specific surface area is ≥40.0m 2 / g, the regeneration process route is selected; otherwise, the re-production process route is selected.

[0089] The regeneration process is as follows:

[0090](1) Purge: use air to purge the surface and channels of the spent catalyst, and the air pressure is 0.5 MPa; further use sound waves to detect the situation of purge dead ends and blocked holes, and when the blocked holes are found, u...

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Abstract

The invention relates to a green cyclic utilization method of a honeycomb type denitration catalyst, and belongs to the field of flue gas denitration and material cyclic utilization. A regeneration process route and a repreparation process route are set, and a regeneration production line and a repreparation production line are arranged in parallel; a regeneration process or a repreparation process is selected according to the performance of the waste honeycomb type denitration catalyst for green cyclic utilization; and the selection basis of the regeneration process and the repreparation process is as follows: if the axial compressive strength and the radial compressive strength of the waste honeycomb type denitration catalyst are respectively greater than or equal to 1.0 MPa and greaterthan or equal to 0.2 MPa, and the specific surface area is greater than or equal to 40.0 m<2> / g, the regeneration process route is selected, and otherwise, the repreparation process route is selected.According to the green cyclic utilization method of the honeycomb type denitration catalyst, regeneration and repreparation processes are combined, valuable components in the waste denitration catalyst are fully utilized, the use amount of water is greatly reduced, and closed-loop cyclic utilization of the denitration catalyst can be realized.

Description

technical field [0001] The invention relates to a green recycling method for a honeycomb denitrification catalyst, which belongs to the field of flue gas denitrification and material recycling. Background technique [0002] Selective Catalytic Reduction (SCR) technology is the realization of industrial flue gas NO x An important technology for ultra-low emissions, the denitrification catalyst used in it is vulnerable to smoke, SO 2 , Alkali metal, As and other harmful substances are poisoned and deactivated, so the service life of the catalyst is short. The deactivated waste denitrification catalyst is a hazardous waste stipulated in the "National Hazardous Waste List". Its environmental risk is extremely high, but its recycling value is extremely high. If it is not disposed of properly, it will not only occupy land, pollute water and soil, but also cause serious waste of resources. . In 2014, the Ministry of Ecology and Environment issued the "Notice on Strengthening the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/60B01J38/50B01J38/48B01J38/00B01J23/92B01J23/30B01J35/04B01D53/86B01D53/56
CPCB01J38/60B01J38/50B01J38/485B01J38/00B01J23/30B01J23/92B01D53/8628B01J35/56
Inventor 张深根张柏林
Owner UNIV OF SCI & TECH BEIJING
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