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Regeneration and recovery method of waste SCR denitration catalyst

A technology for denitrification catalysts and regeneration solutions, applied in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of comprehensive recycling of unused SCR denitrification catalysts, unfavorable multiple regenerations, and poor regeneration capabilities and other problems, to achieve the effect of improving mechanical strength, solving poor regeneration ability, and improving uniformity

Pending Publication Date: 2020-01-24
GO HIGHER ENVIRONMENT GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the regenerated waste SCR denitration catalyst is not conducive to multiple regenerations, has poor regeneration ability, and does not comprehensively recycle the waste SCR denitration catalyst, thereby providing A method for regeneration and recovery of waste SCR denitrification catalyst

Method used

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  • Regeneration and recovery method of waste SCR denitration catalyst
  • Regeneration and recovery method of waste SCR denitration catalyst
  • Regeneration and recovery method of waste SCR denitration catalyst

Examples

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Embodiment 1

[0058] This embodiment provides a method for the regeneration and recovery of a waste SCR denitration catalyst, such as figure 1 As shown, it specifically includes the following steps:

[0059] Step 1: Judging the regeneration performance of the waste SCR denitration catalyst

[0060] a. Appearance requirements: the average wear depth of the windward end of the honeycomb waste SCR denitrification catalyst is not more than 30mm; the number of penetrating holes is not more than 5; the wear rate of the non-windward end is ≤0.3%;

[0061] b. Physical and chemical properties: axial compressive strength ≥ 1MPa, radial compressive strength ≥ 0.2MPa, specific surface area (BET) ≥ 30m 2 / g;

[0062] Those that meet the above requirements are reversible deactivation SCR denitration catalysts, and those that do not meet the above requirements are irreversible deactivation SCR denitration catalysts.

[0063] Step 2: Preprocessing

[0064] The surface of the reversible deactivation and...

Embodiment 2

[0074] This embodiment provides a method for the regeneration and recovery of a waste SCR denitration catalyst, such as figure 1 As shown, it specifically includes the following steps:

[0075] Step 1: Judging the regeneration performance of the waste SCR denitration catalyst

[0076] a. Appearance requirements: the average wear depth of the windward end of the honeycomb waste SCR denitrification catalyst is not more than 30mm; the number of penetrating holes is not more than 5; the wear rate of the non-windward end is ≤0.3%;

[0077] b. Physical and chemical properties: axial compressive strength ≥ 1MPa, radial compressive strength ≥ 0.2MPa, specific surface area (BET) ≥ 30m2 / g;

[0078] Those that meet the above requirements are reversible deactivation SCR denitration catalysts, and those that do not meet the above requirements are irreversible deactivation SCR denitration catalysts.

[0079] Step 2: Preprocessing

[0080] The surface of reversible deactivation and irreve...

Embodiment 3

[0090] This embodiment provides a method for the regeneration and recovery of a waste SCR denitration catalyst, such as figure 1 As shown, it specifically includes the following steps:

[0091] Step 1: Judging the regeneration performance of the waste SCR denitration catalyst

[0092] a. Appearance requirements: the average wear depth of the windward end of the honeycomb waste SCR denitrification catalyst is not more than 30mm; the number of penetrating holes is not more than 5; the wear rate of the non-windward end is ≤0.3%;

[0093] b. Physical and chemical properties: axial compressive strength ≥ 1MPa, radial compressive strength ≥ 0.2MPa, specific surface area (BET) ≥ 30m2 / g;

[0094] Those that meet the above requirements are reversible deactivation SCR denitration catalysts, and those that do not meet the above requirements are irreversible deactivation SCR denitration catalysts.

[0095] Step 2: Preprocessing

[0096] The surface of the reversible deactivation and ir...

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Abstract

The invention provides a regeneration and recovery method of a waste SCR denitration catalyst. Microwave heating treatment of the active loaded reversible inactivated SCR denitration catalyst is carried out to prepare a regenerated SCR denitration catalyst, wherein a regeneration liquid used during active loading comprises Ti<4+>, V<5+> and W<6+> which are respectively recovered from the irreversible inactivated SCR denitration catalyst. The regeneration and recovery method of the waste SCR denitration catalyst adopts microwave heating to effectively improve the mechanical strength of the regenerated catalyst, so repeated regeneration of the catalyst is facilitated, the dispersion uniformity of active components on the surface of the catalyst is improved, and the denitration activity of the regenerated catalyst is improved; and the Ti<4+>, V<5+> and W<6+> are respectively recycled, so that the recycled Ti<4+>, V<5+> and W<6+> can be used as supplements of the regeneration liquid in theregeneration process to form closed loop circular economy, and surplus products can be sold as products, thereby resources of the waste denitration catalyst are comprehensively recycled.

Description

technical field [0001] The invention relates to the technical field of catalyst regeneration, in particular to a method for regeneration and recovery of a waste SCR denitration catalyst. Background technique [0002] Nitrogen oxides are the main source of air pollution released by coal-fired power plants. With the rapid development of my country's power industry, the release of nitrogen oxides is also increasing. Therefore, the country has comprehensively carried out denitrification and environmental protection technologies in the power industry. [0003] At present, most of my country's coal-fired power plants use selective catalytic reduction (SCR) for dry flue gas denitrification, using ammonia or other reducing agents to selectively reduce nitrogen oxides to harmless nitrogen and water. SCR catalysts mainly include: Vanadium-tungsten series, vanadium-molybdenum series and vanadium-tungsten-molybdenum series; all three are V 2 o 5 and TiO 2 As a catalytically active hos...

Claims

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Application Information

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IPC IPC(8): B01J38/00B01J38/02B01J38/04B01J38/48B01J38/52B01J38/50B01J38/60B01J38/66B01J38/64B01J23/92
CPCB01J38/02B01J38/00B01J38/60B01J38/48B01J38/04B01J38/64B01J38/485B01J38/52B01J38/66B01J38/50B01J2038/005
Inventor 陈福泰褚永前白立强杨艳
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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