Oil boiler
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Solution Overview
Problem
Oil boilers using liquid fuels face challenges in controlling combustion reactions and often produce yellow flames due to incomplete combustion, leading to soot formation that can block combustion gas passages and hinder normal operation.
Innovation Solution
A blue flame type oil boiler design featuring a combustion chamber, flue tubes, a burner with a fuel nozzle, air nozzle, and spark plug, along with a flame tube part that includes recirculation holes to introduce combustion gas, promoting complete combustion and reducing soot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid fuel is used for combustion, then the boiler can operate with liquid fuel flexibility, but incomplete combustion occurs leading to yellow flame and soot formation
Solution Approach 1:
The combustion chamber is divided into multiple zones with different air supply characteristics. The burner assembly includes separate fuel nozzle and air nozzle components that can be independently controlled, allowing segmentation of the combustion process into primary combustion zone and secondary combustion zone for more complete burning
Solution Approach 2:
The system changes combustion parameters by controlling air-to-fuel ratio through adjustable nozzles. The air nozzle can vary air injection quantity and distribution, while the fuel nozzle adjusts spray patterns, transforming the combustion parameters to achieve complete combustion and eliminate soot formation
2Object-generated harmful factors
If air injection is increased to improve combustion completeness, then soot formation is reduced, but combustion stability may be affected
Solution Approach 1:
Different regions of the combustion chamber provide different air supply qualities. The air nozzle creates localized high-velocity air jets in specific zones to enhance mixing and combustion completeness locally, while maintaining overall combustion stability through controlled distribution patterns
Solution Approach 2:
The burner system maintains continuous and stable combustion by ensuring consistent air and fuel supply through properly designed nozzles. The recirculation of combustion gases provides continuous heating of the combustion zone, maintaining stable combustion conditions while preventing soot formation
3Productivity
If recirculation holes are added to the flame tube, then combustion gas is introduced back into the flame tube, but device complexity increases
Solution Approach 1:
The recirculation holes are integrated directly into the flame tube structure itself, merging the recirculation function with the existing flame tube component. This eliminates the need for separate recirculation devices and reduces overall system complexity while maintaining combustion efficiency
Solution Approach 2:
The flame tube incorporates recirculation holes creating a porous-like structure that allows combustion gas to pass through. This simple geometric modification enables gas recirculation without adding complex mechanical components, maintaining productivity while minimizing device complexity
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 design achieves stable combustion, reduces soot formation, and maintains efficient heating, allowing for smooth operation by generating a blue flame and enhancing fuel efficiency.
Implementation Method 1
a spark plug that ignites a mixture of the fuel sprayed and the air injected
Implementation Method 2
a recirculation hole formed through the flame tube such that the combustion gas in the interior space is introduced into the flame tube from the outside of the flame tube
Implementation Method 3
a plurality of flue tubes provided in the empty space of the outer container to heat heating water flowing in the empty space of the outer container by guiding combustion gas generated by the combustion reaction
Data Source
AI summary
An oil boiler includes an outer container having openings at opposite ends, a combustion chamber that covers an opening at an upper end of the outer container and in which a combustion reaction occurs, a lower cover that covers an opening at a lower end of the outer container, a plurality of flue tubes to heat heating water flowing in the outer container by guiding combustion gas, a burner including a fuel nozzle that sprays fuel, an air nozzle that injects air, and a spark plug that ignites a mixture of the fuel and the air, and a flame tube part that defines a tube space by surrounding a partial space in which the mixture is ignited, the flame tube part including a flame tube having an open lower end and a recirculation hole formed through the flame tube such that the combustion gas is introduced into the flame tube.