Central Control System for Dark-Fire Tobacco Curing
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Solution Overview
Problem
The dark-fire curing process of tobacco leads to the formation of tobacco-specific nitrosamines (TSNA), which are harmful and increase with higher temperatures, necessitating finer control over temperature and ventilation during the curing stages to minimize their formation.
Innovation Solution
A central control system that monitors and adjusts temperature and humidity levels in real-time within the curing structure, using sensors and actuators to manage ventilation fans and air intake vents, and can incorporate an external smoking structure for controlled smoke introduction, thereby reducing TSNA formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher temperatures are used in the dark-fire curing process, then the curing efficiency and tobacco processing speed are improved, but the formation of tobacco-specific nitrosamines (TSNA) increases
Solution Approach 1:
The patent implements dynamic temperature control by dividing the curing process into multiple stages (yellowing, color setting, drying, finishing) with different temperature ranges. The system dynamically adjusts temperature based on the curing stage and environmental conditions, allowing efficient processing while preventing excessive temperature-driven TSNA formation. Sensors continuously monitor temperature and humidity to enable real-time adjustments.
Solution Approach 2:
The patent changes multiple parameters simultaneously including temperature, relative humidity, and ventilation rates across different curing stages. By coordinating these parameter changes, the system achieves efficient curing while maintaining conditions that minimize TSNA formation, particularly by controlling temperature below critical thresholds during stages when TSNAs are most readily formed.
2Device complexity
If traditional manual control methods are used for curing conditions, then the system complexity is reduced, but the precision and consistency of temperature and humidity control deteriorate
Solution Approach 1:
The patent implements feedback control by continuously monitoring temperature and humidity with sensors and automatically adjusting ventilation fans and heating elements through a microcontroller. This closed-loop system maintains precise control of curing conditions while reducing manual intervention. The system compares actual conditions with target conditions and makes real-time adjustments to maintain optimal curing parameters.
Solution Approach 2:
The curing system performs self-regulation through automated control algorithms that adjust ventilation and heating based on sensor readings without requiring constant manual intervention. The microcontroller autonomously manages the curing process by interpreting sensor data and controlling actuators, enabling consistent precision while simplifying operator workload.
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 system effectively minimizes TSNA formation by providing precise control over temperature and smoke flow, ensuring better quality tobacco harvests by maintaining optimal conditions throughout the curing process.
Implementation Method 1
at least one ventilation fan coupled to the curing structure
Implementation Method 2
sensors and actuators to manage ventilation fans and air intake vents
Implementation Method 3
actuators to manage ventilation fans and air intake vents
Data Source
AI summary
The present invention relates to systems and apparatus for dark-fire curing of tobacco. Specially, the present invention provides a central control system for controlling and adjusting conditions within a structure utilized for curing dark-fired tobacco, for example by remotely turning the ventilation fan on or off. Additionally, the invention provides for an external smoking structure incorporated into the control system. This allows for simultaneous control of external smoking, that is smoking that is physically separated from curing, and the transportation of smoke into the into the dark-fire curing structure, in addition to the control of the curing structure itself.