Premix Burner Contained Pilot Flame Combustion Head
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing premix burners face challenges in delivering a wide range of power levels for diverse industrial applications while reducing nitrogen oxide emissions, which requires increasing air excess, making it difficult to light the main flame and poses safety hazards due to external pilot flame systems exposed to thermal stresses and hazardous conditions.
Innovation Solution
A premix burner design where the pilot flame generation device is completely contained within the combustion head, using a concave metal element with a support structure and internal spark electrode, allowing for easy ignition and operation of a low-power pilot flame that can optionally deliver significant thermal power, eliminating external duct hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If air excess is increased to reduce nitrogen oxide emissions, then emission reduction is achieved, but main flame lighting becomes difficult
Solution Approach 1:
A pilot flame is introduced as an intermediary device to facilitate main flame ignition. The pilot flame burns in a separate combustion chamber and provides a reliable ignition source for the main flame, allowing the premix burner to operate with high air excess ratios (5:1 to 10:1) for emission control while maintaining easy lighting capability through the pilot flame mediator.
2Ease of operation
If external pilot flame system is used, then lighting function is provided, but safety hazards increase due to thermal stresses and exposed conditions
Solution Approach 1:
The pilot flame combustion chamber is merged with the main combustion head, forming an integrated structure where the pilot flame burns internally within the combustion head rather than externally. This integration protects the pilot flame from thermal stresses and hazardous external conditions, eliminating safety hazards while maintaining the lighting function.
Solution Approach 2:
The pilot flame combustion chamber is nested within the main combustion head structure. The pilot flame burns in an internal chamber that is contained within the outer combustion head, creating a nested configuration where the pilot flame is protected by the surrounding structure from external thermal stresses and hazards.
3Ease of operation
If pilot flame is placed in vicinity of combustion zone, then ignition is achieved, but thermal stresses on pilot flame increase
Solution Approach 1:
The combustion system is segmented into two separate chambers: a pilot flame combustion chamber and a main combustion zone. The pilot flame burns in its own dedicated chamber with controlled air-fuel mixture, positioned internally within the combustion head but separated from the main high-temperature combustion zone. This segmentation allows the pilot flame to provide effective ignition while being protected from excessive thermal stresses of the main combustion zone.
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 solution enables easy lighting and safe operation of the premix burner with a contained pilot flame system, reducing nitrogen oxide emissions and preventing explosion hazards, while allowing for adjustable power delivery and improved combustion quality.
Implementation Method 1
internal spark electrode
Implementation Method 2
concave metal element with a support structure
Implementation Method 3
pilot flame generation device
Data Source
AI summary
A premix burner which comprises a combustion head comprising, in turn, a perforated covering element provided with a plurality of openings. The premix burner is characterised in that it is provided with a device for generating and delivering a minimum granted thermal power completely arranged inside the combustion head. Moreover, the device comprises a concave element, whose concavity faces the internal wall of the perforated covering element.