Dual-Circuit Gas Burner Sequencing for Outer-Ring Flame Stability
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Solution Overview
Problem
Dual circuit gas burners face issues where the inner burner ring interferes with the secondary air supply to the outer burner ring, leading to unstable combustion and flame extinction at the outer burner ring.
Innovation Solution
A method and control unit that alternately open the gas flow to the outer burner ring while keeping the inner burner ring closed for a predetermined period, ensuring sufficient secondary air supply to the outer burner ring, thereby preventing flame extinction and improving combustion reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the gas flow to both inner and outer burner rings is opened simultaneously, then the burner can operate at high power, but the inner burner ring interferes with the secondary air supply to the outer burner ring causing flame extinction
Solution Approach 1:
The control unit opens the gas flow to the outer burner ring before opening the gas flow to the inner burner ring. This preliminary action ensures that the outer burner ring receives sufficient secondary air and establishes stable combustion before the inner burner ring is activated, preventing the inner burner from interfering with the outer burner's air supply.
Solution Approach 2:
The control unit operates the burners in a sequential periodic manner rather than simultaneously. The gas flow to the outer burner ring is opened first, maintained for a predetermined period, then the gas flow to the inner burner ring is opened. This periodic operation allows each burner to function independently without interfering with the other's air supply.
2Reliability
If the gas flow to the inner burner ring is opened first, then the inner burner can ignite, but the inner burner ring takes away the secondary air of the outer burner ring leading to bad combustion
Solution Approach 1:
The control unit performs preliminary action by opening the gas flow to the outer burner ring before the inner burner ring. This ensures that the outer burner establishes stable combustion and receives adequate secondary air before the inner burner is activated, preventing the inner burner from stealing air from the outer burner's combustion zone.
3Power
If dual circuit gas burners are designed with both inner and outer burner rings, then the maximum burner power is increased, but the spread between minimum and maximum burner power becomes especially large
Solution Approach 1:
The control unit dynamically adjusts the gas flow to each burner ring independently based on operational requirements. The system can open only the outer burner ring for low-power operations, open both rings for high-power operations, or adjust each ring's gas flow separately, providing flexible and adaptive power control across a wide range.
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 ensures balanced secondary aeration and enhances the safety and reliability of dual circuit gas burners by maintaining stable flames at the outer burner ring.
Implementation Method 1
increasing the quantity of secondary air provided to the outer burner ring
Implementation Method 2
the gas (in particular, the gas provided in the gas flow) can be a mixture of a fuel gas, such as acetylene, natural gas or propane, with an oxidizer, such as ambient air, supplied oxygen
Implementation Method 3
A deficiency of secondary air may lead to a lapse of the flames
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A method of operating a dual circuit gas burner (1) including an inner burner ring (4) and an outer burner ring (2) surrounding the inner burner ring (4); the method including: opening (S1) a gas flow to the outer burner ring (2) while maintaining a gas flow to the inner burner ring (4) closed during a predetermined period of time (T).