Pyrolytic Oven Temperature Control With Gas-Electric Heating Stages
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Solution Overview
Problem
Domestic gas cooking ovens lack effective temperature regulation during pyrolytic cleaning, leading to rapid temperature rise and high emissions of volatile organic compounds, particularly carbon monoxide, without a catalytic cell for treatment.
Innovation Solution
A method involving sequential operation of electric heating elements and gas burners to regulate temperature, with a catalytic cell for VOC treatment, ensuring minimal emissions and zero carbon monoxide release by switching burners on and off rather than varying gas flow, and using an ignition burner for automatic gas burner ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gas flow control valve is used to regulate temperature during pyrolytic cleaning, then temperature regulation is achieved, but temperature rises too rapidly causing high VOC emissions
Solution Approach 1:
The heating function is segmented into two independent systems: gas burners for primary heating and electric heating elements for supplementary temperature control. This segmentation allows the gas flow to be turned off completely while electric elements provide fine temperature regulation, preventing rapid temperature spikes that cause high VOC emissions.
Solution Approach 2:
The invention changes the control parameter from continuous gas flow modulation to binary on/off switching of gas burners combined with electric heating. By switching gas flow completely off rather than partially on, the system avoids the rapid temperature rise that occurs with traditional valve control, thereby reducing VOC emissions while maintaining temperature regulation through electric supplementation.
2Temperature
If gas flow control valve is used for temperature regulation, then temperature control is possible, but carbon monoxide levels remain high
Solution Approach 1:
The heating system is segmented into gas burners and electric heating elements with independent control. During pyrolytic cleaning, the gas burners can be switched off completely while electric elements maintain temperature, eliminating incomplete combustion that produces carbon monoxide while preserving temperature control capability.
Solution Approach 2:
The control strategy changes from modulating gas flow to binary switching of gas supply combined with electric heating supplementation. This parameter change ensures that when gas is supplied, it is either fully on or fully off, preventing partial combustion conditions that generate carbon monoxide, while electric elements ensure temperature maintenance during gas-off periods.
3Object-generated harmful factors
If catalytic cell is added for VOC treatment, then emissions are reduced, but device complexity increases
Solution Approach 1:
The electric heating elements serve dual functions: they supplement temperature control during pyrolytic cleaning and they preheat the catalytic cell to activate it for VOC treatment. This multi-functionality reduces the need for separate heating systems dedicated solely to catalytic activation, thereby limiting the increase in device complexity while achieving effective VOC emissions reduction.
4Temperature
If electric heating element is used for temperature regulation, then temperature control precision is improved, but energy consumption increases
Solution Approach 1:
The system uses periodic switching of gas burners on and off, supplemented by electric heating elements during off-periods to maintain temperature. This periodic action allows the high-efficiency gas burners to provide the majority of heating energy while electric elements provide supplementary heating only during transition periods, achieving precise temperature control without excessive energy consumption from the less efficient electric elements.
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
Achieves rapid temperature rise and efficient VOC treatment, reducing emissions to near-zero carbon monoxide levels, ensuring user safety and appliance performance verification.
Implementation Method 1
a first step of raising the temperature of the air contained in the muffle by the sequential operation of an electric heating element
Implementation Method 2
a second step of sequentially operating the at least one gas burner and at least partially sequentially operating the electric heating element
Implementation Method 3
This catalytic cell makes it possible in particular to destroy carbon monoxide in order to reduce the emission of toxic gas to almost zero
Data Source
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AI summary
A method for regulating the temperature of a cleaning program by pyrolysis in a domestic gas cooking oven comprising a muffle (2) whose front face (3) is closed by a door (4), and comprising an upper wall ( 5), side walls (6), a bottom wall (7) and a bottom wall (8), as well as at least one gas burner (9) arranged under the bottom wall (8) of said muffle (2) powered on all or nothing, an electric heating element (10) powered on all or nothing disposed under the upper wall (5) of said muffle (2), and said upper wall (5) of the muffle (2) comprising an opening (15) adapted to receive a catalytic cell (16). The method for treating volatile organic compounds in a domestic gas cooking oven comprises the following steps: a first step of raising the temperature of the air contained in the muffle (2) by the sequential operation of an electric heating element ( 10) up to a set temperature (T) for a duration (P1a), a second step of putting the at least one gas burner (9) into sequential operation and of putting the at least partly sequential operation of the electric heating element (10) for a duration (P2), a third stage of continuous operation of the at least one gas burner (9) and sequential operation of the electric heating element (10) for a duration (P3) , and a fourth step of stopping operation of said one electric heating element (10) and at least one gas burner (9).