Gas Burner Inlet Flow for Stable Flames and Heat Transfer
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Solution Overview
Problem
Existing gas burners are sensitive to variations in gas feed, leading to unstable combustion, increased flame length, and sub-optimal heat transfer due to insufficient secondary air inflow, particularly in concentric ring configurations, resulting in inefficient heat transfer and potential flame extinguishment.
Innovation Solution
Incorporating an auxiliary gas port that generates a forced auxiliary gas flow over the inlet device's channel wall, enhancing the suction of primary ambient air and increasing the flame speed, reducing the need for secondary air, and optimizing combustion proximity to the flame ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gas feed is increased to improve heat output, then power increases, but flame length increases and flame stability deteriorates
Solution Approach 1:
The burner divides the flame into two distinct zones: primary combustion zone close to the burner surface where fuel burns with limited air, and secondary combustion zone further away where residual gases complete combustion with ambient air. This segmentation allows high power output while maintaining flame stability by controlling combustion stages separately.
Solution Approach 2:
Different regions of the flame are given different qualities: the primary flame zone has high temperature and concentrated energy for heat output, while the secondary zone provides stable combustion and complete burning. The burner geometry creates local conditions optimized for each combustion stage, with the pan bottom positioned to receive heat from the hottest primary zone.
2Productivity
If distance to heating surface is reduced to improve heat transfer efficiency, then heat transfer efficiency increases, but secondary air inflow is restricted and combustion completeness deteriorates
Solution Approach 1:
The combustion process is segmented into two zones: primary combustion close to the burner for efficient heat transfer, and secondary combustion further away for complete burning. This allows the pan bottom to be positioned optimally for heat reception while secondary air can still reach the outer flame regions for complete combustion.
Solution Approach 2:
The burner geometry acts as an intermediary structure that facilitates both close coupling for heat transfer and adequate air supply. The specific configuration of the burner body and flame ports creates flow patterns that allow secondary air to penetrate the flame zone while maintaining intense heat transfer to the pan bottom.
3Productivity
If primary air supply is increased to improve combustion completeness, then combustion efficiency increases, but flame temperature decreases and heat transfer deteriorates
Solution Approach 1:
Air supply is segmented into two stages: primary air mixed with fuel at the burner for controlled combustion, and secondary ambient air for completing combustion. By limiting primary air, the invention maintains high flame temperature for efficient heat transfer, while secondary air ensures complete combustion of residual gases.
Solution Approach 2:
The burner performs preliminary combustion of the fuel-air mixture close to the flame ports, creating a hot primary flame for efficient heat transfer. The remaining combustible gases then burn with ambient air in the secondary zone, ensuring complete combustion without compromising the temperature of the primary heat transfer 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
This design achieves stable combustion with reduced flame blow-off risk, complete combustion, and improved heat transfer efficiency, allowing for closer proximity to heating surfaces and meeting stricter environmental requirements.
Implementation Method 1
the at least one auxiliary gas port is coupled to auxiliary gas means which are able and configured to generate and maintain together with the gas flow a forced auxiliary gas flow
Implementation Method 2
the auxiliary gas flow over the wall of the inlet device creates an underpressure upstream, which enhances this suction
Implementation Method 3
The gas-air mixture which combusts outside the flame ports on the basis of the primary air, also referred to as the primary combustion
Implementation Method 4
The hottest part of the flame is the part in which the primary combustion takes place. In order to achieve an optimal heat transfer from the flame to the pan bottom
Implementation Method 5
The heat produced thereby can be relinquished to a surface for heating, for instance a bottom of a pan or kettle
Data Source
AI summary
A domestic gas burner comprising a housing with a chamber, which can be coupled to an optionally controlled feed for a gaseous fuel and is in open communication with the environment via flame ports for the purpose of igniting a gas flame. An inlet device is coupled to the housing and comprises an entrance for receiving gaseous fuel, ambient air, and an outlet for feeding a fuel/air mixture to the burner chamber. The entrance and the outlet are in open communication with each other via a fuel channel which extends therebetween and is bounded by a wall. A gas port debouches into the entrance during operation to feed a fuel flow. The entrance allows substantially free entry of ambient air, and the inlet device comprises auxiliary gas means for generating and maintaining a flow of an auxiliary gas, directed toward the outlet, over the wall of the fuel channel.