Pyrolysis Cauldron Stirring Geometry to Prevent Residue Adhesion
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Solution Overview
Problem
Existing oil-liquefaction apparatuses face efficiency reduction due to adhesion of materials containing inorganic substances like calcium carbonate to the kettle, leading to complex residue treatment and decreased pyrolysis efficiency.
Innovation Solution
A pyrolysis furnace with a pyrolysis cauldron having a convex downward bottom surface and a stirring device with sliding blades that prevent material adhesion, combined with a condenser system for efficient gas condensation and utilization of exhaust gases, ensuring thorough stirring and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If materials containing inorganic substances like calcium carbonate are processed in conventional pyrolysis apparatuses, then chemical recycling is achieved, but material adhesion to the kettle occurs reducing pyrolysis efficiency
Solution Approach 1:
The pyrolysis cauldron employs a convex downward bottom surface (domed shape) instead of a flat bottom. This curved geometry prevents material adhesion by eliminating flat surfaces where carbonized plastic and inorganic substances can stick, thereby maintaining pyrolysis efficiency while enabling chemical recycling of materials containing calcium carbonate
Solution Approach 2:
A stirring device with rotating blades is installed in the pyrolysis cauldron to dynamically mix the material during heating. This continuous stirring prevents material from adhering to the kettle surface and ensures uniform pyrolysis, resolving the contradiction between achieving chemical recycling and maintaining pyrolysis efficiency
2Temperature
If heating is applied to the pyrolysis cauldron, then thermal decomposition is promoted, but material adhesion to the heated surface increases
Solution Approach 1:
The convex downward bottom surface of the pyrolysis cauldron eliminates flat heated surfaces where material would adhere. The curved geometry ensures that even during intensive heating, material does not stick to the kettle, allowing high-temperature thermal decomposition without the harmful effect of adhesion
Solution Approach 2:
The stirring device is activated before and during the heating process to continuously move material away from the heated surface. This preliminary and continuous stirring action prevents material adhesion before it can occur, enabling efficient thermal decomposition without the negative consequences of material sticking
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 apparatus achieves efficient chemical recycling without reducing thermal decomposition efficiency, maintaining high oil purity and improving overall operating efficiency by preventing material adhesion and optimizing heat transfer.
Implementation Method 1
a heating furnace for heating the pyrolysis cauldron from the outside
Implementation Method 2
a pyrolysis furnace for pyrolyzing a synthetic resin-containing material that is input
Implementation Method 3
a condenser for condensing a pyrolysis gas generated in the pyrolysis furnace
Data Source
AI summary
The oil-liquefaction apparatus is provided with a thermal cracking furnace and a condenser, in which the thermal cracking furnace is provided with at least a pyrolysis cauldron 21, a heating furnace 22, a stirring device which stirs a material of interest in the pyrolysis cauldron 21, and a discharge section which discharges a thermal cracking gas generated in the pyrolysis cauldron 21 to the condenser. The pyrolysis cauldron 21 has a bottom part 21d which has a bottom surface 21c, an approximately cylindrical intermediate part 21a, and a lid part 25. A heating furnace 22 heats the bottom part 21d and at least the lower part of the intermediate part 21a. The stirring device has an shaft 27 and a blade part 26. The blade part 26 is slidably contacted with the bottom surface 21c and a ring-shaped surface 21b by rotating the shaft 27.