Crumb Rubber Chiller Baffle Layout for Single-Pass Cooling
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Solution Overview
Problem
The mechanical grinding process of tires into crumb rubber generates excessive heat, causing the crumb rubber to reach vulcanization temperatures, which prevents further grinding until it is cooled, and existing cooling methods are insufficient for immediate reprocessing.
Innovation Solution
An apparatus with an upright housing and internal baffles that uses an upward stream of ambient air to cool crumb rubber, increasing dwell time and turbulence for enhanced thermal energy transfer, allowing for effective cooling in a single pass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical grinding is used to process tires into crumb rubber, then production cost is reduced and particle size can be controlled, but excessive heat is generated causing the rubber to reach vulcanization temperature
Solution Approach 1:
An air classifier is introduced as an intermediary device between the cracker mill and subsequent processing equipment. The air classifier performs dual functions: it separates particles by size using air flow while simultaneously cooling the hot crumb rubber through exposure to ambient air, preventing vulcanization and enabling continuous processing
Solution Approach 2:
The solution uses pneumatic principles by employing an air classifier that utilizes upward air flow to cool the crumb rubber. The air flow serves as a cooling medium that removes heat from the rubber particles without requiring direct contact with cooling surfaces, effectively controlling temperature while maintaining particle size separation
2Ease of operation
If air classifiers are used to separate debris from crumb rubber, then separation is achieved, but cooling is insufficient for immediate reprocessing
Solution Approach 1:
The air classifier is designed to perform multiple functions simultaneously: particle size separation and cooling. By making the cooling function universal to the separation process, the system eliminates the need for separate cooling steps, enabling immediate reprocessing of crumb rubber without time loss
3Reliability
If crumb rubber is cooled before further grinding, then vulcanization is prevented, but additional cooling time is required reducing productivity
Solution Approach 1:
The air classifier enables continuous cooling and separation operations without interrupting the grinding process. Crumb rubber flows continuously through the air classifier where it is cooled and separated, then immediately proceeds to further grinding, maintaining continuous productive action while ensuring process reliability through adequate cooling
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 effectively cools chipped tires and crumb rubber to suitable temperatures for immediate reprocessing, integrating seamlessly into existing recycling systems and applicable for other granular materials.
Implementation Method 1
an upward stream of ambient air drawn through the upright housing to cool crumb rubber particles that are deposited into and fall through the housing
Implementation Method 2
The rising turbulent air mass enhances the transfer of thermal energy from the falling crumb rubber
Data Source
AI summary
The apparatus or “chiller” uses an upward stream of ambient air drawn through the upright housing to cool crumb rubber particles that are deposited into and fall through the housing. The chiller includes an upright chiller housing and an array of internal baffles disposed within the lower section of the housing. Crumb rubber deposited into the chiller housing falls through the upward air flow within the chiller housing and cascades around and through the baffle array before exiting the chiller. The baffle array inside the lower section of the chiller housing slows the fall of the crumb rubber, thereby increasing the dwell time through the chiller to provide enhanced cooling. The baffle array also creates a more turbulent air flow through which the crumb rubber falls. The rising turbulent air mass enhances the transfer of thermal energy from the falling crumb rubber.