Roasting System Gas Recirculation and Catalytic Emission Control
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Solution Overview
Problem
Food roasting machines, particularly those used for coffee beans, face challenges in reducing energy consumption and emissions, with existing solutions like high-temperature incineration increasing complexity and energy use, and often requiring costly ventilation systems that may not be feasible in all settings.
Innovation Solution
A roasting system with a recirculating gas flow path that includes a cyclonic separator, catalytic converter, and blower, controlled by a controller to manage heater and blower states, allowing for efficient gas recirculation and ambient air addition, thereby reducing energy consumption and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If high temperature incineration is used to treat emissions, then emissions are reduced, but energy consumption increases and system complexity increases
Solution Approach 1:
The patent applies catalytic conversion to transform harmful emissions (NOx, CO, VOCs) into beneficial or less harmful substances (N2, CO2, H2O) through chemical reactions catalyzed by a catalyst bed. This converts the harmful exhaust stream into a clean output without requiring high-temperature incineration, thereby reducing energy consumption while maintaining emission reduction effectiveness
Solution Approach 2:
The system changes the operational parameters from high-temperature incineration to lower-temperature catalytic conversion. The catalyst bed operates at moderate temperatures to facilitate chemical reactions that convert harmful gases into clean emissions, avoiding the high energy input required for thermal incineration while achieving comparable or superior emission reduction
2Object-generated harmful factors
If high temperature incineration is used to treat emissions, then emissions are reduced, but device complexity increases
Solution Approach 1:
The catalytic converter system replaces complex high-temperature incineration equipment with a simpler catalyst bed assembly. The catalyst bed passively facilitates chemical conversion of harmful gases through its catalytic surface, eliminating the need for complex combustion control systems, flame monitoring, and high-temperature heat exchangers required for incineration
Solution Approach 2:
The patent replaces mechanical/thermal systems (incineration furnaces, combustion controls, high-temperature heat exchangers) with a chemical system (catalyst bed). The catalyst bed uses chemical catalysis rather than mechanical combustion to achieve emission reduction, significantly simplifying the overall system architecture and reducing maintenance requirements
3Use of energy by moving object
If recirculating gas flow path is implemented, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the exhaust treatment function with the heating function by implementing a recirculating gas flow path. The treated exhaust gases are recirculated back to the roasting chamber to provide supplemental heating, combining emission treatment and energy recovery into a single integrated system. This eliminates the need for separate ventilation and heating systems, achieving energy efficiency improvements without proportionally increasing complexity
Solution Approach 2:
The recirculating gas flow path gives the exhaust stream multiple functions: it serves as both the medium for catalytic conversion (emission treatment) and as a heat source for the roasting chamber (energy recovery). This multi-functionality allows the system to achieve both emission reduction and energy efficiency improvement using the same gas stream, maximizing the utility of each component
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 achieves improved energy efficiency and cleaner emissions by optimizing temperature control and gas recirculation, reducing the need for costly ventilation systems and minimizing energy use while maintaining effective roasting performance.
Implementation Method 1
The plurality of components includes a cyclonic separator
Implementation Method 2
The plurality of components includes a catalytic converter
Implementation Method 3
The plurality of components includes one or more heaters
Implementation Method 4
The plurality of components includes a main blower
Data Source
AI summary
A bean roasting system includes a roasting chamber, a blower, a variable diverter and a controller. The roasting chamber, the blower and the variable diverter each is disposed at least partially within a recirculating gas flow path. The blower is configured to provide a flow stream of gas through the recirculating gas flow path. The variable diverter is configured to split the gas flow path into at least two flow paths including a treated flow path and a bypass flow path. The treated flow path includes a series arrangement of a gas heater and a catalytic converter. The variable diverter is configured to control a percentage of a flow stream of gas that is diverted into the bypass flow path. The controller is configured to activate different predetermined operating modes for the bean roasting system by controlling a state of the variable diverter and a state of the heater.