Vertical Firing Furnace Layout for CO2 Removal in Cathode Baking
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Solution Overview
Problem
Conventional firing apparatuses for secondary battery positive electrode materials face challenges in efficiently discharging carbon dioxide gas, leading to chemical reactions that degrade the material quality due to insufficient gas flow rates and cross-sectional imbalances.
Innovation Solution
A vertical-type firing apparatus that moves the positive electrode material in a vertical direction, incorporating an exhaust part for gas discharge and an air supply part for gas intake, with a heating system that maintains a specific temperature profile, enhancing gas flow and discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If gas is supplied to the firing space through conventional means, then the firing reaction can proceed, but the carbon dioxide gas generated from the positive electrode material cannot be effectively discharged, leading to chemical reactions that degrade material quality
Solution Approach 1:
The patent inverts the conventional gas flow approach by positioning the exhaust part at the upper portion and air supply part at the lower portion of the vertical firing space. This inversion creates a natural upward convection current that efficiently carries carbon dioxide gas generated from the material upward to the exhaust outlet, preventing the gas from remaining in contact with the material and causing degradation reactions.
Solution Approach 2:
The patent utilizes pneumatic principles by designing a vertical gas flow system where air is supplied at the lower portion and exhaust is discharged at the upper portion. The gas flow rate and pressure distribution are optimized to create sufficient upward velocity to carry away carbon dioxide gas effectively, using fluid dynamics to solve the gas discharge problem.
2Area of stationary object
If the window cross-section of the sagger is small compared to the firing space cross-section, then the sagger fits in the firing space, but only a very small amount of the total gas flow rate passes through the sagger
Solution Approach 1:
The patent transitions from horizontal gas flow to vertical gas flow by orienting the firing space vertically. The exhaust part is positioned at the upper portion and air supply at the lower portion, creating a vertical dimension for gas flow that increases the effective path length and allows greater gas flow rates through the sagger while maintaining proper fit.
Solution Approach 2:
The patent changes the gas flow parameters by establishing a vertical flow direction with optimized velocity distribution. The gas flow rate is increased by utilizing the vertical dimension, and the temperature profile is optimized with higher temperatures in the temperature-maintaining space to enhance the firing reaction efficiency.
3Device complexity
If conventional horizontal firing is used, then the apparatus structure is simple, but the gas flow rate through the material is insufficient and carbon dioxide discharge is ineffective
Solution Approach 1:
The patent inverts the conventional horizontal firing configuration to a vertical arrangement. The exhaust part is positioned at the upper portion and air supply at the lower portion, creating upward gas flow that naturally carries carbon dioxide away from the material. This inversion maintains relatively simple apparatus structure while dramatically improving gas discharge effectiveness.
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
Improves carbon dioxide gas discharge and firing reaction quality, increasing the charging amount and productivity while reducing costs through optimized gas flow and temperature control.
Implementation Method 1
temperature of the temperature-maintaining space is higher than temperature of the temperature-raising space and temperature of the cooling space
Implementation Method 2
water vapor and carbon dioxide gas are generated from the positive electrode material accommodated in the sagger
Implementation Method 3
The carbon dioxide gas has a greater molecular weight than oxygen or air used to control the atmosphere of the firing furnace, and thus is difficult to be discharged to the outside of the sagger
Data Source
AI summary
A vertical-type firing apparatus for a positive electrode material for a secondary battery, for vertically moving and firing the positive electrode material for the secondary battery, comprises: a vertical-type firing furnace including an exhaust part, an air supply part, and a firing space positioned between the exhaust part and the air supply part; and a heater for heating the firing space of the vertical-type firing furnace, wherein the firing space includes a temperature-raising space, a cooling space, and a temperature-maintaining space located between the temperature-raising space and the cooling space, and the temperature of the temperature-maintaining space is higher than the temperature of the temperature-raising space and the temperature of the cooling space.