Burner Unit Air Preheating Combustion Quality
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Solution Overview
Problem
Existing burner assemblies for fuel-operated vehicle heaters and reformer arrangements face issues with low-temperature air intake leading to excessive pollutant generation and cooling effects during combustion, resulting in poor combustion quality and increased risk of deposits.
Innovation Solution
A burner assembly with a pot-shaped combustion chamber featuring a central air inlet area and a longer air flow path through ring-like air flow spaces, allowing for increased thermal interaction with components and preheating of air before combustion, reducing the cooling effect and enhancing combustion quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air is taken from the environment and introduced directly into the combustion chamber, then the device complexity is reduced, but the combustion quality deteriorates due to excessive pollutant generation and cooling effect
Solution Approach 1:
The patent applies preliminary action by preheating the air before it enters the combustion chamber. The air is directed through a preheating area where it absorbs thermal energy from the housing and combustion chamber walls before mixing with fuel. This preliminary thermal treatment reduces the cooling effect during combustion and decreases pollutant formation, resolving the contradiction between simple air supply and clean combustion.
Solution Approach 2:
The patent introduces an intermediary structure - the preheating area with first and second air flow spaces - that mediates between the environmental air and the combustion chamber. This intermediary zone allows thermal interaction with heated components, transforming the cold air into preheated air before combustion, thereby reducing harmful emissions without significantly complicating the overall device.
2Object-generated harmful factors
If air is preheated through a longer flow path, then combustion quality improves with lower pollutant emissions, but the device complexity increases due to additional air flow spaces
Solution Approach 1:
The patent applies multi-functionality by designing the housing and combustion chamber walls to serve dual purposes: they contain the combustion process while simultaneously acting as heat transfer surfaces for preheating the air. The first and second air flow spaces utilize existing structural components for thermal interaction, avoiding additional dedicated heating elements and reducing overall device complexity despite the extended air path.
Solution Approach 2:
The patent employs nesting by placing the second air flow space within or adjacent to the first air flow space, creating a nested configuration. This nested arrangement allows the air to progress through multiple thermal interaction zones in a compact manner, extending the preheating path without proportionally increasing device volume or complexity.
3Manufacturing precision
If air is introduced at higher temperature, then combustion quality improves and deposits are reduced, but the cooling effect during combustion is reduced which may increase combustion chamber temperature
Solution Approach 1:
The patent applies parameter changes by modifying the temperature parameter of the air before combustion. The air temperature is increased through thermal interaction in the preheating spaces, transforming it from cold environmental air to preheated air. This parameter change improves combustion quality and reduces deposits while the extended air path ensures gradual heating that maintains safe combustion chamber temperatures.
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 design achieves improved combustion characteristics with lower pollutant emissions, reduced deposit formation, and increased operational reliability by preheating air before combustion, making it less dependent on external temperature conditions.
Implementation Method 1
a significantly longer flow path is required compared to the prior art, which entails a correspondingly stronger thermal interaction with the components or assemblies that delimit this flow path. Since all of these components or assemblies are increasingly heated, particularly during combustion operation, the air to be introduced into the combustion chamber can also absorb more heat
Data Source
Figure 1~2
AI summary
The burner assembly (10) has a pot-like combustion chamber housing (12) with a peripheral wall (14), a base wall (16) and an air inlet region (28) is provided in central range of the base wall. An air supply region (36) has a partial ringlike air flow chamber (38) with an inlet (40) and an outlet (42) to ringlike another air flow chamber (44). The former air flow region sectionally surrounds the later air flow region. The later air flow region is in connection with the air inlet region at its inner area radially relative to a longitudinal axis of the burner assembly.