Hot Air Burner Ignition Chimney Calibrated Orifice Design
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Solution Overview
Problem
Existing gas burners with internal ignition face issues such as self-sustained combustion in the ignition chamber, noise during ignition, high voltage and energy requirements for electrode sparks, and problems with extender components causing flashback and electric charge absorption, leading to inefficient and noisy operation.
Innovation Solution
A gas burner design featuring an ignition chimney within the pressure recovery chamber with a calibrated orifice, an additional grid to prevent flashback, and a rigid electric conductor with an oblique portion to manage gas flow and electric connections, reducing turbulence and energy requirements for ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tubular housing with ignition spark plug is used, then ignition is achieved, but self-sustained combustion occurs in the cavity causing heating of the ignition chamber wall
Solution Approach 1:
The harmful cavity is removed from the system. Instead of using a tubular housing that creates a cavity, the patent uses a flat ignition chamber bottom with a calibrated orifice, extracting the problematic cavity structure while maintaining ignition functionality through the orifice design.
Solution Approach 2:
The ignition chamber bottom has different local properties: a calibrated orifice is provided in a specific location to control gas flow and prevent cavity formation, while the rest of the bottom provides structural support and ignition surface, creating localized functional zones to avoid overheating.
2Object-affected harmful factors
If a through-orifice with reduced section is used in the ignition chamber wall, then self-sustained combustion is suppressed, but sudden combustion causes noisy operation
Solution Approach 1:
The calibrated orifice parameters (size, shape, position) are specifically designed to control the rate of gas flow and combustion propagation. By optimizing these parameters, the system achieves quiet ignition without sudden explosive combustion, balancing noise reduction with effective ignition.
Solution Approach 2:
The ignition process is controlled to occur in a regulated, progressive manner through the calibrated orifice rather than sudden explosive action. The orifice design creates a controlled, periodic gas flow pattern that burns steadily and quietly instead of causing noisy sudden combustion.
3Productivity
If a large gap between ignition electrodes is used for direct ignition, then ignition efficiency is improved, but high voltage and energy requirements increase
Solution Approach 1:
The calibrated orifice parameters are optimized to create ideal ignition conditions with controlled gas flow velocity and mixing. This allows for effective ignition with smaller electrode gaps, reducing the voltage and energy requirements while maintaining high ignition efficiency through proper flow control rather than relying on large gaps.
Solution Approach 2:
The calibrated orifice acts as an intermediary element that prepares the gas mixture for ignition by controlling flow and mixing. This intermediary function creates optimal conditions that reduce the energy burden on the ignition electrodes, allowing efficient ignition with lower voltage and energy input.
4Reliability
If extender components are added to protect against flashback, then safety is improved, but electric charge absorption increases reducing ignition effectiveness
Solution Approach 1:
The harmful extender component is removed from the system. The patent achieves flashback protection without extenders by using the calibrated orifice design and ignition chamber geometry to naturally prevent flame propagation back into the gas supply line, eliminating the energy-absorbing extender component.
Solution Approach 2:
The ignition chamber design serves multiple functions: it provides ignition surface, controls gas flow through the calibrated orifice, prevents flashback through its geometric design, and maintains proper mixing. This multi-functional design eliminates the need for separate extender components that would absorb electric charge.
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 prevents self-sustained combustion, reduces noise and energy needs for ignition, and ensures safe and efficient operation by maintaining ideal ignition conditions and protecting the ignition system from overheating and external aggressions.
Implementation Method 1
because of the pressure difference existing between the calibrated orifice and the outlet orifice of the ignition chimney, a gas mixture flow is generated inside the ignition chimney with a velocity less than the gas flow inside the combustion chamber and at a relatively low pressure
Implementation Method 2
the spark generated between the ignition electrodes causes ignition with no deflagration of the gas mixture inside the ignition chamber
Implementation Method 3
combustion that propagates axially right up to the combustion chamber of the burner, thereby causing ignition of the burner
Implementation Method 4
The ignition chimney is constantly swept and cooled by the gas mixture flowing in the pressure recovery chamber of the burner
Implementation Method 5
the use of an ignition spark plug mounted in a tubular housing opening out into the ignition chamber by means of an orifice provided in a location of the wall of said chamber located at right angles to the side area of the grid... the tubular housing of the plug forms a cavity generating a turbulent state of gas flow emitted by the perforations of the grid
Data Source
AI summary
The invention relates to a hot air internal ignition burner/generator comprising an injection device used for producing a high-speed fuel gas mixture stream and for injecting said stream into the burner head (2) which is tabular-shaped and comprises in-series arranged therein a pressure recovery chamber (10), an igniting chamber (11) and simple or multiple diffusion means (24) which are fixed inside the head (2), where two chambers are jointed, wherein said diffusion means (24) comprise a central orifice provided with an igniting tube which penetrates therein and axially extends inside the pressure recovery chamber (10) in such a way that it defines the ignition chamber (43) provided with igniting electrodes (42) connected to the pressure recovery chamber (10) of the burner (2) via a calibrated orifice (46).