Reflow Oven Exhaust Filtration with In-Situ Oxidative Self-Cleaning
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Solution Overview
Problem
Existing exhaust gas purification devices in reflow ovens suffer from contamination buildup that reduces purification efficiency and necessitate frequent maintenance, leading to operational issues and increased costs.
Innovation Solution
An exhaust gas purification device with a filtering unit, controllable gas passage, and heating component that allows for self-cleaning and maintenance modes, utilizing oxidation and physical changes to remove contaminants, including a self-cleaning temperature for physical changes and an oxidation temperature for chemical reactions, thereby prolonging maintenance intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exhaust gas purification device is used to remove contaminants, then purification efficiency is improved, but contaminants accumulate in the device requiring frequent maintenance
Solution Approach 1:
The exhaust gas purification device performs self-cleaning by introducing oxygen-containing gas and heating the filtering component to oxidation temperature, enabling it to remove accumulated carbon contaminants automatically without external intervention, thus reducing maintenance frequency while maintaining purification efficiency
Solution Approach 2:
The device changes the temperature parameter of the filtering component from normal operating temperature to oxidation temperature (heating to sufficient temperature to cause carbon to chemically react), and changes the chemical environment by introducing oxygen-containing gas, enabling the removal of accumulated contaminants
2Reliability
If heating component is used to heat gas to oxidation temperature, then carbon is removed through chemical reaction, but energy consumption increases
Solution Approach 1:
The self-cleaning gas passage is controllably opened to introduce oxygen-containing gas only during self-cleaning cycles, and the heating component operates periodically to heat the gas to oxidation temperature, rather than continuously, thereby reducing overall energy consumption while maintaining effective contaminant removal when needed
Solution Approach 2:
The device converts the harmful accumulated carbon contaminants into beneficial gas products through oxidation reactions, where carbon reacts with oxygen to form carbon dioxide or carbon monoxide that can be discharged, transforming the pollution problem into a solution
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 device effectively prolongs maintenance intervals, reduces maintenance costs, and maintains purification efficiency by physically and chemically transforming contaminants, allowing continuous operation of the reflow oven without shutdowns.
Implementation Method 1
a heating component provided in the filtering unit, wherein the heating component is configured to be capable of heating the gas in the filtering unit to an oxidation temperature at which carbon in adherent substances on the filtering component is capable of chemically reacting to produce a gas
Implementation Method 2
a controllable gas passage that controllably communicates an interior of the filtering unit with an external environment containing oxygen, the controllable gas passage being configured to controllably introduce gas containing oxygen into the filtering unit
Data Source
AI summary
The present disclosure discloses an exhaust gas purification device for purifying exhaust gas in a reflow oven hearth, the exhaust gas purification device comprising: a filtering unit; a filtering component provided in the filtering unit; a controllable gas passage that controllably communicates an interior of the filtering unit with an external environment containing oxygen, the controllable gas passage being configured to controllably introduce gas containing oxygen into the filtering unit; a heating component provided in the filtering unit, wherein the heating component is configured to be capable of heating the gas in the filtering unit to an oxidation temperature at which carbon in adherent substances on the filtering component is capable of chemically reacting to produce a gas. The exhaust gas purification device of the present disclosure has a long maintenance period, which can greatly reduce the maintenance cost.