Microwave Thermal Desorption of Oil-Contaminated Soil
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Solution Overview
Problem
Current methods for purifying oil-contaminated soil and gravel, such as thermal treatment and microbiological methods, face economic and environmental feasibility challenges, with microwave desorption technologies experiencing microwave leakage and inefficient energy use.
Innovation Solution
A thermal desorption system using microwave indirect irradiation with a cylindrical outer and inner tube configuration, where microwaves are reflected in a cavity space to generate heat, and microwave attenuating members prevent leakage, allowing for efficient contaminant removal and waste heat reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If microwave direct irradiation is used for thermal desorption, then heating efficiency is improved, but microwave leakage and energy loss increase
Solution Approach 1:
The patent introduces a microwave-absorbing material as an intermediary substance that converts microwave energy into heat. This material is mixed with the contaminated soil and gravel, allowing indirect microwave irradiation that prevents direct microwave leakage while maintaining heating efficiency for thermal desorption of contaminants.
2Reliability
If conventional thermal treatment methods are used, then contaminant removal is achieved, but energy consumption and cost increase
Solution Approach 1:
The patent changes the energy delivery parameters by using microwave frequency electromagnetic radiation instead of conventional thermal treatment methods. This parameter change enables more efficient energy transfer to the contaminated material through the microwave-absorbing substance, reducing overall energy consumption while maintaining contaminant removal effectiveness.
3Object-affected harmful factors
If microwave attenuating members are added to prevent leakage, then environmental safety is improved, but device complexity increases
Solution Approach 1:
The patent extracts the microwave-absorbing function from the system structure and incorporates it into the treatment material itself. By mixing the microwave-absorbing substance with the contaminated soil and gravel, the system eliminates the need for separate microwave attenuating structural components, thereby preventing leakage without significantly increasing device complexity.
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 system achieves high contaminant removal efficiency with low equipment costs, environmental friendliness, and energy efficiency by preventing microwave leakage and utilizing waste heat, making it economically viable for field applications.
Implementation Method 1
an outer circumferential surface of the inner tube is provided with a microwave absorbing and heat generating element for absorbing microwaves to generate heat
Implementation Method 2
a cavity space for reflecting microwaves is provided between the outer tube and the inner tube, and the microwaves irradiated from the microwave oscillating part generate irregular reflection in the cavity space
Implementation Method 3
thermal desorption treatment section in which the contaminated soil and gravel are subjected to thermal desorption treatment
Data Source
AI summary
Disclosed are a thermal desorption system for oil-contaminated soil and gravel, using a microwave indirect irradiation method and including a microwave emission prevention device and a preheating device using waste heat, and a thermal desorption method for oil-contaminated soil and gravel, using the same. In addition, it is disclosed that an outer tube encompassing an inner tube extends to both sides and a plurality of ring-shaped microwave attenuation units are arranged on the inner circumferential surface of the outer tube, such that microwaves are prevented from leaking between the inner tube and the outer tube, thereby enabling eco-friendliness, and even the waste heat generated during a pollutant desorption process is utilized in the system itself, thereby enabling economic feasibility to increase further.