Multi-Mode Microwave Roll-to-Roll Nut Drying for Lower Energy Use
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Solution Overview
Problem
Conventional electric hot air heating systems for nut drying are inefficient, leading to high energy consumption and significant carbon emissions, with thermal efficiency below 40% and annual carbon emissions exceeding 254.5 metric tons per system.
Innovation Solution
A multi-mode microwave roll-to-roll nut drying system utilizing an open drying chamber, conveyor belt, multi-mode microwave device, and hot air circulation, with orthogonally arranged microwave input ports and dual heating methods to achieve rapid and uniform drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional electric hot air heating system is used for nut drying, then the drying process can be completed, but thermal efficiency is below 40% and energy consumption is high
Solution Approach 1:
The patent replaces the conventional electric hot air heating system with a microwave heating system. Microwave radiation directly heats the nuts through dielectric heating, eliminating the need for complex air circulation and heating systems, thereby achieving thermal efficiency of 75% compared to below 40% for conventional systems
Solution Approach 2:
The patent changes the heating mechanism from indirect thermal convection to direct microwave radiation. By adjusting microwave power levels and exposure time, the system achieves rapid heating and drying with 75% thermal efficiency, significantly improving energy utilization
2Productivity
If conventional electric hot air heating system operates for 12 hours a day, then nut drying can be completed, but electricity consumption reaches up to 2000 kWh per day
Solution Approach 1:
The patent replaces the conventional electric hot air heating system with a microwave heating system. Microwave radiation directly heats the nuts through dielectric heating, eliminating the need for complex air circulation and heating systems, thereby achieving thermal efficiency of 75% compared to below 40% for conventional systems
Solution Approach 2:
The patent implements continuous roll-to-roll processing where nuts are continuously fed through the drying zone on a conveyor belt, eliminating batch processing interruptions. This continuous operation with microwave heating reduces total energy consumption while maintaining high productivity
3Productivity
If conventional heating equipment is used, then nut drying can be achieved, but carbon emissions reach 1.202 metric tons per day
Solution Approach 1:
The patent replaces the conventional electric hot air heating system with a microwave heating system. Microwave radiation directly heats the nuts through dielectric heating, eliminating the need for complex air circulation and heating systems, thereby achieving thermal efficiency of 75% compared to below 40% for conventional systems
Solution Approach 2:
The patent changes the heating mechanism from indirect thermal convection to direct microwave radiation. By adjusting microwave power levels and exposure time, the system achieves rapid heating and drying with 75% thermal efficiency, significantly improving energy utilization and reducing carbon emissions
4Manufacturing precision
If multi-mode microwave device with orthogonally arranged microwave input ports is used, then heating uniformity is improved, but device complexity increases
Solution Approach 1:
The patent divides the microwave heating system into multiple independent microwave generators with orthogonally arranged input ports. Each generator can be independently controlled to provide uniform heating across different zones, achieving homogeneous heating while maintaining manageable system complexity through modular design
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 a heating efficiency of 75%, reduces electricity consumption by 44%, and decreases carbon emissions by 44% per metric ton of product, while increasing production capacity and improving nut flavor.
Implementation Method 1
The multi-mode microwave device is installed above the open drying chamber to emit microwaves into the drying zone
Implementation Method 2
a hot air circulation device... to achieve rapid and uniform drying
Data Source
AI summary
A multi-mode microwave roll-to-roll nut drying system including an open drying chamber, a roll-to-roll device, a multi-mode microwave device and a hot air circulation device is provided. The open drying chamber includes an inlet, an outlet and a drying zone between the inlet and the outlet. The roll-to-roll device includes a conveyor belt, wherein the conveyor belt is configured to be conveyed through the inlet, the drying zone, and the outlet of the open drying chamber, and the conveyor belt is made of a non-microwave absorbing material. The multi-mode microwave device is installed above the open drying chamber to emit microwaves into the drying zone. The multi-modal microwave device includes microwave input ports, and any two adjacent ones of the microwave input ports are orthogonally arranged.