Pyrolytic Oven Heating Rate Control to Reduce Odor Pollution
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Solution Overview
Problem
Existing pyrolytic cleaning methods for cooking appliances generate strong, unpleasant odors due to the exchange of air between the cooking chamber and the surrounding environment, and previous solutions involving catalysts are inadequate for odor control during the pyrolysis process, requiring additional sensors that are prone to malfunction at high temperatures.
Innovation Solution
A method that involves heating the cooking chamber in a controlled manner, with a moderate heating rate of 2-4 K/min from 270°C to 350°C and 4-7 K/min from 350°C to the pyrolysis target temperature, followed by a constant pyrolysis holding phase, and occasional peak temperatures, to convert odor-intensive molecules slowly and reduce odor pollution, without the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cooking chamber is heated rapidly to pyrolysis temperature, then the cleaning process is faster, but odor pollution increases significantly
Solution Approach 1:
The heating process is divided into multiple phases with different heating rates: a first heating phase at a first heating rate (higher speed), and a second heating phase at a second heating rate (lower, controlled rate) when the temperature reaches 270°C. This segmentation allows the process to be fast overall while controlling odor-generating temperature ranges.
Solution Approach 2:
The heating rate is dynamically adjusted based on the current temperature. The control device automatically reduces the heating rate when the temperature reaches 270°C (the critical odor generation threshold) and maintains this reduced rate until 350°C is reached, then restores the higher heating rate. This dynamic adjustment optimizes both speed and odor control.
2Object-generated harmful factors
If catalysts are added to counteract odor, then odor pollution is reduced, but the device complexity increases and additional sensors are required
Solution Approach 1:
The system uses its existing temperature sensor and control device to automatically regulate the heating rate based on temperature feedback. No additional sensors or external catalyst systems are needed - the existing components perform the odor control function through intelligent heating rate management.
Solution Approach 2:
The patent replaces the mechanical/chemical approach of using catalysts and additional sensors with a control-based approach that uses the existing temperature sensing and control system to manage odor by adjusting heating rates in critical temperature ranges.
3Object-generated harmful factors
If the heating rate is reduced in the critical temperature range, then odor pollution is reduced, but the total process time increases
Solution Approach 1:
The heating rate is dynamically adjusted based on the current temperature. The control device automatically reduces the heating rate when the temperature reaches 270°C (the critical odor generation threshold) and maintains this reduced rate until 350°C is reached, then restores the higher heating rate. This dynamic adjustment optimizes both speed and odor control.
Solution Approach 2:
The heating rate parameter is changed based on temperature conditions. By reducing the heating rate only in the critical temperature range (270°C to 350°C) where odor-intensive molecules are converted, and maintaining higher heating rates in other ranges, the total process time is minimized while odor pollution is controlled.
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 approach significantly reduces odor pollution, allowing for effective odor control through ventilation and catalytic converters, shortening the pyrolysis process duration, and simplifying implementation by eliminating the need for additional sensors, making it suitable for retrofitting existing appliances.
Implementation Method 1
the cooking chamber is heated to a pyrolysis target temperature of between 400° C. and 600° C. in a heating-up phase
Implementation Method 2
catalysts, in particular in an exhaust air opening of the cooking appliance, which decompose and/or burn the odorous substances escaping from the cooking chamber
Implementation Method 3
catalysts, in particular in an exhaust air opening of the cooking appliance, which decompose and/or burn the odorous substances escaping from the cooking chamber
Data Source
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AI summary
The invention relates to a method for the pyrolytic cleaning of a cooking appliance (2) and to a corresponding cooking appliance (2). The cooking appliance (2) has at least one heatable cooking chamber (4), a heating device for heating the cooking chamber (4), and a temperature control device (12) for controlling a cooking chamber temperature (T). The cooking chamber (4) is heated to a pyrolysis target temperature (ZT) between 400 °C and 600 °C during a heating phase (A). It is further proposed that the cooking chamber (4) be heated to a cooking chamber temperature (T) of 270 °C. Starting from a cooking chamber temperature (T) of 270 °C, the cooking chamber (4) is to be heated to a cooking chamber temperature (T) of 350 °C at an average heating rate of 2 K/min to 4 K/min.