Cocoa Nib Roasting Drum with Internal Convection Heating
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Solution Overview
Problem
The existing methods for drying and roasting cocoa kernels are inefficient, leading to over- or under-roasting, which impairs aroma and flavor profiles due to uneven heat distribution and the insulating effect of cocoa shells, resulting in undesirable changes in taste and loss of cocoa butter.
Innovation Solution
A method involving a drum that can be heated from the outside, with a heated stream of clean air passed through for convection heating of cocoa kernel parts, allowing for precise control of temperature and air flow to enhance aroma and flavor development, while eliminating the insulating effect of cocoa shells and reducing processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cocoa beans are roasted in a drum heated exclusively from the outside with hot combustion exhaust gases, then the roasting process can be carried out continuously, but the heat distribution is uneven causing over- and under-roasting which impairs aroma and flavor profiles
Solution Approach 1:
The heating system is segmented into multiple independent heating zones within the drum, allowing different regions to be heated separately. This enables precise control of heat distribution to achieve uniform roasting throughout the cocoa beans while maintaining continuous processing capability.
Solution Approach 2:
Different regions of the drum are equipped with tailored heating characteristics - some areas receive more intense heating while others receive gentler heating. This local differentiation of heating quality ensures that all cocoa beans regardless of position achieve uniform roasting, resolving the over-/under-roasting problem while preserving continuous operation.
2Device complexity
If the drum is heated from the outside only, then the device structure is simple, but the heat transfer efficiency is low resulting in long processing times
Solution Approach 1:
The heating system merges external drum heating with internal direct heating elements. Both heating methods work simultaneously to provide efficient heat transfer, significantly reducing drying and roasting times while maintaining relatively simple device structure through the integration of these complementary heating approaches.
3Use of energy by moving object
If hot combustion exhaust gases are used for heating, then energy utilization is efficient, but the combustion fumes affect the aromas and flavor profiles of the cocoa
Solution Approach 1:
A heat exchanger is introduced as an intermediary between the combustion gases and the cocoa beans. The combustion gases transfer their thermal energy to a separate fluid in the heat exchanger, which then transfers heat to the cocoa beans without direct contact. This maintains energy efficiency while eliminating harmful fume contamination of the aromatic cocoa product.
4Stability of the object's composition
If whole unpeeled cocoa beans are roasted, then the complete bean structure is preserved, but the tough seed shells make it difficult for moisture to pass through and for steam distillation of unfavorable substances
Solution Approach 1:
A preliminary drying phase is implemented before the main roasting process. During this preliminary action, the cocoa beans are exposed to controlled heating that prepares the shell structure for subsequent moisture removal and steam distillation during roasting, enabling efficient processing while maintaining bean integrity throughout the complete process.
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
This method improves the aroma and flavor profiles of cocoa products, shortens the drying and roasting phases, reduces energy requirements, and prevents caking, achieving more consistent and desirable taste outcomes.
Implementation Method 1
a heated stream of clean air, in particular a heated stream of clean air, is passed through the drum. This stream of clean air transfers heat to the cocoa kernels by convection.
Data Source
Figure 1~2
AI summary
The invention relates to a method for drying and/or roasting cocoa nibs and/or cocoa nib pieces in a drum (10), which can be heated from the outside. According to the invention, in addition to heating the drum (10) from the outside for transferring heat by convection, a flow of clean hot gas (5) is passed into the drum (10). This flow of clean hot gas is passed manually through the drum (10). The invention furthermore relates to a device for drying and/or roasting cocoa nibs and/or cocoa nib pieces, which is suitable, in particular, for carrying out the method of the invention.