Microwave Thermal Coupling Chemical Looping Gasification
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Solution Overview
Problem
Biomass chemical looping gasification technologies face challenges in achieving efficient and rapid gasification reactions due to stringent high-temperature and high-pressure requirements, and microwave heating struggles to directly heat biomass effectively, complicating the reaction process and product control.
Innovation Solution
A microwave-based thermal coupling chemical looping gasification method employing two sources, utilizing a device with a microwave radiation cavity, quartz pipe reaction cavity, and microwave absorbing material, which combines microwave electromagnetic heating with conventional heating methods to achieve stable high temperatures and efficient gasification, while ensuring safety and environmental friendliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature and high pressure conditions are applied to achieve higher calorific value syngas, then the gasification reaction efficiency is improved, but the energy input requirement and device complexity increase significantly
Solution Approach 1:
The patent combines two heating sources (microwave heating and conventional electric heating) into a unified heating system. The microwave heating unit provides rapid volumetric heating while the conventional heating unit maintains stable temperature, together achieving efficient gasification at lower overall energy input than either method alone could provide
Solution Approach 2:
The patent replaces part of the conventional thermal conduction heating mechanism with microwave electromagnetic radiation heating. This substitution enables direct volumetric heating of the biomass and oxygen carrier particles, eliminating the need for high external temperature gradients and reducing overall energy input requirements
2Use of energy by moving object
If microwave absorbing material is incorporated into biomass to increase heating efficiency, then the microwave heating efficiency is improved, but the reactant complexity increases and reaction control becomes difficult
Solution Approach 1:
The patent separates the heating function from the reactant composition by using dedicated microwave absorbing material in the heating zone rather than modifying the biomass itself. This segmentation allows independent optimization of heating efficiency and reactant purity, maintaining simple reactant composition while achieving high microwave heating efficiency through the separate absorbing material component
Solution Approach 2:
The microwave absorbing material acts as an intermediary that converts microwave energy into thermal energy, which then heats the biomass and oxygen carrier. This intermediary approach enables efficient energy transfer without requiring the biomass itself to have complex microwave absorbing properties, thus maintaining reactant simplicity while achieving high heating efficiency
3Stability of the object's composition
If conventional heating methods are used to achieve stable high temperature, then the temperature stability is improved, but the heating speed and gasification efficiency decrease
Solution Approach 1:
The patent merges microwave heating (fast but less stable) with conventional electric heating (stable but slow) to create a hybrid system that achieves both rapid heating and temperature stability. The microwave component provides quick temperature rise while the conventional heating component maintains steady state, accomplishing both speed and stability simultaneously
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
This approach results in a more stable, efficient, and faster gasification process with reduced energy input, effective temperature control, and safer operation, addressing the complexity and inefficiency of conventional methods.
Implementation Method 1
a loading recess 10 of a microwave absorbing material filled with the microwave absorbing material
Implementation Method 2
microwave heating technology has been gradually applied to physical processing processes
Implementation Method 3
a microwave generator consisting of magnetrons 7 is provided at a central portion of the microwave radiation cavity 13
Implementation Method 4
an infrared temperature-measuring probe group 8 is arranged at two ends of the magnetrons 7
Implementation Method 5
a protection gas cooling device 2 and a protection gas circulating fan 3 are sequentially connected in series on the pipeline
Implementation Method 6
The protection gas cooling device (2) is connected to one end of the protection gas circulating fan (3) in series
Data Source
AI summary
A microwave-based thermal coupling chemical looping gasification method and device. The device includes: a microwave radiation cavity; a loading recess of a microwave absorbing material; and a quartz pipe reaction cavity between the microwave radiation cavity and the loading recess of a microwave absorbing material. A microwave generator consisting of magnetrons is provided at a central portion of the microwave radiation cavity and below the loading recess. An infrared temperature-measuring probe group is arranged at two ends of the magnetrons. Two ends of the microwave radiation cavity are connected to a first and second three-way valves, in communication with the ambient atmosphere and a protection gas charging device. A protection gas cooling device and a protection gas circulating fan are sequentially connected in series on a pipeline between the valves.