Microwave-Assisted SCR Catalyst Regeneration
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Solution Overview
Problem
Existing methods for regenerating selective catalytic reduction (SCR) denitration catalysts are inefficient, requiring high energy consumption, lengthy processes, and pose safety risks due to high pressures and excessive use of pore-expanding solutions, making them unsuitable for industrial-scale regeneration.
Innovation Solution
A method involving microwave-assisted regeneration of SCR denitration catalysts, which includes bubbling cleaning, soaking in a pore-expanding solution, microwave treatment, impregnation with an activating liquid, further microwave drying, and calcination, optimizing pore structures and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional high-temperature high-pressure autoclave method is used for catalyst regeneration, then catalyst activity can be restored, but energy consumption increases and process time extends
Solution Approach 1:
The patent replaces the traditional mechanical heating system (autoclave with external heating) with a microwave heating system. The microwave generator directly couples electromagnetic energy to the catalyst material, enabling rapid internal heating without the need for external heat conduction, thereby significantly reducing energy consumption and process time while achieving the same regeneration effect
Solution Approach 2:
The patent applies microwave pretreatment before the main regeneration process. This preliminary microwave heating activates the catalyst and prepares its pore structure for subsequent treatment, reducing the total energy and time required for complete regeneration while maintaining catalyst activity
2Stability of the object's composition
If traditional pore-expanding treatment with absolute ethyl alcohol is used, then catalyst pore structure is improved, but excessive solution is wasted
Solution Approach 1:
The patent replaces the liquid-based pore-expanding method (soaking in absolute ethyl alcohol) with microwave-assisted vapor-phase treatment. The microwave heating of the pore-expanding agent creates vapor that penetrates the catalyst pores more efficiently, achieving the same pore structure improvement with significantly reduced solution consumption
Solution Approach 2:
The patent utilizes phase transition of the pore-expanding agent from liquid to vapor through microwave heating. This phase change enables the expanding agent to better penetrate the catalyst pore structure and reduces the total amount of liquid solution needed, thereby reducing waste while maintaining pore structure stability
3Object-generated harmful factors
If ultrasonic cleaning and prolonged standing time are used, then catalyst surface is cleaned, but process time extends significantly
Solution Approach 1:
The patent replaces mechanical ultrasonic cleaning with microwave-induced thermal and cavitation effects. The microwave heating creates rapid thermal expansion and contraction within the catalyst pores, effectively dislodging contaminants and reducing cleaning time from multiple hours to minutes while achieving the same surface cleanliness
4Reliability
If high-temperature maintenance in autoclave is used, then catalyst regeneration is achieved, but energy consumption and process time increase
Solution Approach 1:
The patent replaces external mechanical heating with internal microwave heating. The microwave energy is directly absorbed by the catalyst material, creating rapid and uniform internal heating that achieves the required regeneration temperature much faster than external heating, thereby reducing process time while maintaining regeneration effectiveness
Solution Approach 2:
The microwave pretreatment step performs preliminary heating and activation of the catalyst before the main regeneration process. This preliminary action reduces the total time and energy required for complete regeneration by preparing the catalyst structure in advance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in catalysts with improved specific surface area, pore volume, and activity, offering economic benefits and safer, more efficient regeneration suitable for industrial use.
Implementation Method 1
In microwave heating technology, high-frequency reciprocating motions of dipole molecules inside the heated object generate 'internal friction heat' and cause internal and external heating and temperature rise at the same time without any heat conduction process
Implementation Method 2
poisoned SCR denitration catalyst after actual industrial application successively undergo ultrasonic pretreatment
Implementation Method 3
finally flows through the catalyst layer to be dried and is then discharged from the drying chamber
Data Source
AI summary
Disclosed is a method for regenerating a SCR denitration catalyst assisted by microwaves. The method comprises: (1) a poisoned SCR denitration catalyst is immersed in deionized water, and the SCR denitration catalyst is cleaned by a bubbling method; (2) the SCR denitration catalyst is transferred to a container containing a pore-expanding solution for a soaking treatment; (3) the SCR denitration catalyst is transferred to a microwave device and treated for 1-10 minutes; (4) the SCR denitration catalyst is transferred to a container with an activating liquid and impregnated for 1-4 hours; (5) the SCR denitration catalyst is dried with microwaves for 1-20 minutes; and (6) the SCR denitration catalyst is calcined under conditions of 500-600° C. for 4-7 hours. The present invention has readily available raw materials, is simple and energy-saving in device and process, and is suitable for industrial scale regeneration. The catalyst treated by the method of the present invention has the advantages of loose pore channels, obviously optimized pore structures, significantly improved catalyst surface conditions, high activity, and good economic benefits.