Double-Shell Combustion Furnace With Swirl Airflow and Flame Control
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Solution Overview
Problem
Conventional combustion furnaces face issues with incomplete combustion due to insufficient air supply, leading to prolonged ignition times, black smoke, and carbon monoxide production, as well as inefficient heat convection and temperature maintenance, resulting in poor combustion performance.
Innovation Solution
A combustion furnace design featuring an inner and outer shell with gas inlet piping and a flame inhibiting cover, including first and second gas holes, a baffle sheet, and a combustion supporting device to facilitate air swirl and complete combustion, with a wedge-shaped opening and ash removing openings to enhance airflow and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional combustion furnace design is used without sufficient air supply, then device complexity is reduced, but combustion efficiency deteriorates and ignition time increases
Solution Approach 1:
The air supply system is segmented into multiple gas inlet holes distributed at different locations (bottom, side, and top portions of the inner shell), allowing air to enter through multiple pathways simultaneously. This segmentation enables sufficient air supply for complete combustion without requiring complex centralized air injection systems.
Solution Approach 2:
Different regions of the inner shell are equipped with gas inlet holes tailored to local combustion needs. The bottom portion has gas inlet holes for primary air supply, side portions have holes for secondary air, and the top portion has holes for tertiary air, creating locally optimized air-fuel mixing zones that improve combustion efficiency without increasing overall device complexity.
2Quantity of substance
If larger sized materials are placed in the combustion furnace, then fuel capacity is increased, but combustion completeness deteriorates and black smoke generation increases
Solution Approach 1:
The air supply approach transitions from a single-dimensional (bottom-up) airflow to a multi-dimensional airflow pattern by placing gas inlet holes at the bottom, sides, and top of the inner shell. This three-dimensional air distribution enables oxygen to reach larger fuel materials from multiple directions simultaneously, ensuring complete combustion of bulky materials without generating black smoke or carbon monoxide.
3Device complexity
If conventional combustion furnace without cover is used, then device complexity is reduced, but temperature maintenance deteriorates and combustion stability worsens
Solution Approach 1:
The flame inhibiting cover is designed as a nested structure that fits over the top opening of the inner shell, creating an enclosed combustion chamber while maintaining the simplicity of the overall furnace design. This nested cover traps heat within the combustion zone, maintaining stable temperatures and preventing flame ejection without requiring complex insulation systems or additional structural components.
4Device complexity
If flame ejection upward occurs without cover, then device complexity is reduced, but heat convection efficiency deteriorates and ignition time increases
Solution Approach 1:
The flame inhibiting cover extracts and eliminates the harmful effect of upward flame ejection by providing a physical barrier that redirects flames to remain within the combustion chamber. This simple cover structure prevents heat loss and maintains proper heat convection patterns, significantly reducing ignition time without adding complex flame control mechanisms.
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 ensures stable combustion, reduces black smoke and dust, and maintains internal temperature, achieving improved combustion efficiency and performance by promoting airflow and complete fuel combustion.
Implementation Method 1
The first air holes allow the swirl generation when the fresh air enters into the inner shell
Implementation Method 2
Combustion furnaces burn combustible materials, such as woods, leaves, papers, charcoals or other biomass fuels
Data Source
AI summary
A combustion furnace includes an inner shell, an outer shell, a gas inlet piping and a flame inhibiting cover. The inner shell defines a receiving cavity therein. The inner shell defines a plurality of first gas holes around the periphery of a top portion thereof. The inner shell defines a gas inlet hole at a bottom thereof. The outer shell encloses the inner shell such that a gas flowing space is defined between the inner shell and the outer shell. The gas inlet piping has an opening formed at one end thereof, and the gas inlet piping communicates with the gas flowing space. The flame inhibiting cover is atop the outer shell and the inner shell, and a lower flange of the flame inhibiting cover is below the first gas holes.