Pilot Burner Air Control for Stable Main Burner Combustion
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Solution Overview
Problem
The existing combustion apparatus for boilers with pilot and main burners experiences unstable combustion and generation of CO and unburned substances due to continued air supply to the pilot burner after gas fuel is stopped, affecting the main burner's combustion state.
Innovation Solution
A combustion apparatus that allows adjustment of air supply to the pilot burner, either by reducing it to zero or supplying air for cooling, using a supply amount adjusting means such as an electromagnetic valve, to prevent air from interfering with the main burner's flame, thereby maintaining a stable combustion state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If combustion air is continuously supplied to the pilot burner after gas fuel is stopped, then the pilot burner structure is cooled, but the air from the pilot burner blows against the main burner flame, reducing flame temperature and causing unstable combustion
Solution Approach 1:
The air supply to the pilot burner is segmented into two distinct phases: during combustion (for stable burning) and after combustion stops (for cooling). The patent separates the air supply control for the pilot burner from the main burner, allowing independent control of cooling air without affecting main burner combustion stability.
Solution Approach 2:
The patent introduces a preliminary cooling air supply mechanism that activates automatically when the gas fuel supply to the pilot burner is stopped. This preliminary action ensures the pilot burner is immediately cooled after combustion ceases, preventing heat accumulation while avoiding interference with the main burner flame.
2Temperature
If air is supplied to the pilot burner after gas fuel is stopped, then the pilot burner is cooled, but CO and unburned substances are generated at the main burner due to reduced flame temperature
Solution Approach 1:
The patent extracts the cooling function from the combustion air supply system. A separate air supply route is provided specifically for cooling the pilot burner after combustion stops, separating the cooling air flow from the main burner combustion zone to prevent harmful emissions.
Solution Approach 2:
The patent introduces an intermediary control mechanism (air supply control means) that mediates between the pilot burner cooling requirement and the main burner combustion stability. This intermediary device regulates air supply timing and direction to satisfy both requirements simultaneously.
3Reliability
If multiple pilot burners are provided for one main burner, then the possibility of defective ignition is reduced, but the device complexity increases
Solution Approach 1:
The patent enables the pilot burner to serve itself through automatic control. The air supply control means automatically adjusts air supply based on the combustion state, eliminating the need for manual intervention or complex multi-pilot-burner configurations to ensure reliable ignition.
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 solution ensures a stable combustion state without generating CO and unburned substances at the main burner, even when gas fuel is stopped for the pilot burner, and improves the durability of the pilot burner by appropriate air management.
Implementation Method 1
a blower (30) for supplying combustion air
Implementation Method 2
the supply amount adjusting means be formed by an electromagnetic valve provided in the air supply route
Implementation Method 3
the ignition of the main burner is effected by using the flame of the pilot burner
Data Source
AI summary
An object of the present invention is to provide a combustion apparatus equipped with a pilot burner and a main burner capable of establishing a stable combustion state without involving generation of CO and unburned substances at the main burner even when the supply of a gas fuel to the pilot burner is stopped. A combustion apparatus equipped with a pilot burner and a main burner according to the present invention is characterized in that, when the main burner is in a combustion state, the amount of air supplied to the pilot burner can be adjusted. Here, the amount of air supplied to the pilot burner is an amount allowing the pilot burner to be cooled.