Yankee Dryer Induction Heating to Replace Steam Systems
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Solution Overview
Problem
Traditional papermaking machines using steam-heated Yankees face challenges with high energy consumption, complex steam systems, environmental emissions, and structural complexities due to pressurized steam, as well as inefficiencies in heat transfer and control of thermal processes.
Innovation Solution
A papermaking machine employing an electromagnetic induction system within the Yankee, using a conductive mantle heated by induced currents to eliminate the need for steam, simplifying the system and improving energy efficiency and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam is used to heat the Yankee, then the heating function is achieved, but the system complexity and CO2 emissions increase
Solution Approach 1:
The patent replaces the steam-based thermal heating system with an electromagnetic induction heating system. The induction system uses electromagnetic fields to generate heat directly in the Yankee mantle, eliminating the need for steam generation, boilers, and associated pressure control systems, thereby reducing overall system complexity while maintaining the heating function.
Solution Approach 2:
The patent changes the heating mechanism from thermal convection (steam) to electromagnetic induction. By altering the physical principle used for heating, the system achieves the same temperature control function without requiring pressurized steam infrastructure, thus simplifying the device while maintaining temperature control capability.
2Temperature
If steam is used to heat the Yankee, then the heating function is achieved, but CO2 emissions increase
Solution Approach 1:
The patent replaces the steam-based thermal heating system with an electromagnetic induction heating system. The induction system uses electromagnetic fields to generate heat directly in the Yankee mantle, eliminating the need for steam generation, boilers, and associated pressure control systems, thereby reducing overall system complexity while maintaining the heating function.
Solution Approach 2:
The patent changes the heating mechanism from thermal convection (steam) to electromagnetic induction. By altering the physical principle used for heating, the system achieves the same temperature control function without requiring pressurized steam infrastructure, thus simplifying the device while maintaining temperature control capability.
3Temperature
If steam is used to heat the Yankee, then the heating function is achieved, but energy efficiency decreases
Solution Approach 1:
The patent replaces the steam-based thermal heating system with an electromagnetic induction heating system. The induction system uses electromagnetic fields to generate heat directly in the Yankee mantle, eliminating the need for steam generation, boilers, and associated pressure control systems, thereby reducing overall system complexity while maintaining the heating function.
Solution Approach 2:
The patent changes the heating mechanism from thermal convection (steam) to electromagnetic induction. By altering the physical principle used for heating, the system achieves the same temperature control function without requiring pressurized steam infrastructure, thus simplifying the device while maintaining temperature control capability.
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
Reduces CO2 emissions, simplifies the system by eliminating steam-related components, enhances thermal control, and improves energy efficiency by directly generating heat within the Yankee, reducing operational costs and structural complexities.
Implementation Method 1
The electromagnetic fields, which vary over time, generate induced currents in the metallic material of the mantle which, due to the Joule effect, produce localized overheating
Implementation Method 2
The electromagnetic fields, which vary over time, generate induced currents in the metallic material of the mantle which, due to the Joule effect, produce localized overheating
Implementation Method 3
The heat produced at the internal surface of the Yankee diffuses by conduction through the thickness of the mantle, until it reaches the external surface with which the sheet being dried is in contact
Data Source
AI summary
A papermaking machine including a Yankee including a body provided with a metal mantle with circular cross-section and two end heads on which are formed or mounted two respective coaxial pins arranged along a rotation axis of the Yankee, the body being configured to rotate with a predetermined angular speed around said rotation axis. Inside the body is arranged a fixed electromagnetic induction heating system including one or more inductors interacting electromagnetically with the mantle to produce induced electric currents in the same mantle, the inductors being arranged near the radially innermost surface of the mantle. In the machine is arranged a structured web configured for transporting a sheet of fibrous material up to the contact of the latter with the mantle of the Yankee.