Graphitization Furnace Uniform Heating via Joule Effect
Solution Overview
Problem
Existing graphitization processes face inefficiencies and quality issues due to batch processing and non-uniform heating in Acheson furnaces, which are unable to achieve high temperatures consistently, leading to thermal damage and suboptimal graphite production.
Innovation Solution
A graphitization furnace using an electrically conductive crucible and electrode with a shaped head to apply electric current uniformly to carbon powder, generating Joule heat for graphitization, along with a conveyor system for continuous processing and additional heating means to ensure temperature uniformity and high productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If Acheson furnaces are used for graphitization, then heating can be achieved, but the heating is not uniform and temperatures over 2500 degrees C cannot be realized
Solution Approach 1:
The patent replaces the external mechanical heating system (Acheson furnace with carbon heaters) with an internal electrical heating system. Electric current is applied directly to the carbon source material through electrodes, generating heat internally through Joule heating. This substitution enables achieving temperatures over 2500 degrees C and ensures uniform heating throughout the material, resolving both the temperature limitation and heating uniformity issues of the Acheson furnace method.
2Productivity
If batch processing is used for graphitization, then the process can be executed, but efficiency is low
Solution Approach 1:
The patent implements continuous processing by conveying the carbon source material through the graphitization furnace in a continuous manner. The material is fed continuously into the furnace, undergoes graphitization through continuous electrical heating, and is discharged continuously. This eliminates the interruptions and idle times inherent in batch processing, thereby improving processing efficiency and reducing overall processing time while maintaining consistent heating conditions.
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 solution enables high-quality graphite production with improved yield and energy efficiency through uniform heating and continuous processing, overcoming the limitations of batch processing and thermal damage in existing methods.
Implementation Method 1
applying electric current to the powder through the crucible and the electrode
Data Source
AI summary
Graphite is produced from powder as a carbon source by means of a graphitization furnace. The graphitization furnace is comprised of: an electrically conductive crucible including a hollow configured to house the powder; an electrode including a columnar shaft and a head provided at an end of the shaft, the head having a shape selected from the group consisting of a sphere, a hemisphere, a column with a rounded edge, a cone, and a cone with a rounded tip; and a power source configured to apply electric current to the powder through the crucible and the electrode.