Heating Device Flashback Detection Through Combustion-Air Flow
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Solution Overview
Problem
Existing methods for detecting irregular ignition processes in heaters are not sufficiently precise, leading to potential damage and unsafe operation due to issues like hard ignition and flashbacks, and require complex structural changes or integration into existing systems.
Innovation Solution
A method that monitors the flow rate of the combustion mixture during ignition, detecting a flashback by measuring diagnostic parameters such as the virtual combustion air ratio, which drops significantly during an irregular ignition, and automatically prevents further ignition attempts to ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods monitor conveyor system parameters to detect irregular ignition, then detection capability is provided, but measurement precision is insufficient
Solution Approach 1:
The patent changes the monitored parameter from general conveyor system parameters (speed, position) to the specific physical parameter of combustion mixture flow rate. This flow rate parameter directly reflects the ignition process state, enabling precise detection of irregularities such as flashbacks through deviations from expected flow rate values during the ignition sequence.
2Measurement precision
If existing methods monitor conveyor speed and fuel valve position, then some detection capability is achieved, but detection precision remains insufficient
Solution Approach 1:
The patent replaces mechanical monitoring parameters (conveyor speed, valve position) with a direct measurement of the combustion mixture flow rate. This substitution provides a more direct and precise indication of the ignition process state, as the flow rate directly reflects the actual physical conditions in the combustion chamber during ignition, making irregularities easier to detect with higher precision.
3Reliability
If existing methods are used to detect hard ignition, then some safety monitoring is provided, but precision is not sufficient to ensure safe operation
Solution Approach 1:
The patent implements a feedback mechanism where the measured combustion mixture flow rate is continuously monitored and compared against expected values during the ignition process. When deviations indicate irregular ignition events such as flashbacks or hard ignition, the system provides immediate feedback to prevent further ignition attempts, thereby ensuring safe operation through precise real-time detection and response.
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
Automated detection of irregular ignition processes, particularly flashbacks, prevents further ignition attempts and potential damage, while being easily integrated into existing heaters without significant structural changes.
Implementation Method 1
a flow sensor (11) arranged in the combustion air supply (4) and/or in the mixture channel (16), which can detect an occurring mass or volume flow
Implementation Method 2
ignited by an ignition device, such as a spark or glow igniter
Implementation Method 3
burn a mixture of a fuel, in particular gas or hydrogen, and ambient air in a combustion chamber
Data Source
Figure 2
AI summary
A method is proposed for detecting an irregular ignition process of a heater (1). The heater (1) comprises a burner (3) to which a flow rate of a combustion mixture comprising a fuel and combustion air is supplied. During commissioning of the heater (1), a target flow rate of combustion air is set, a predetermined mass flow of fuel gas is added to this flow rate, and the resulting combustion mixture is ignited at the burner (3). During commissioning, the supplied flow rate of combustion air is recorded, and a diagnostic parameter is determined using the recorded flow rate of combustion air. This diagnostic parameter is used to detect a flashback if the diagnostic parameter deviates from a first value (19) corresponding to the target flow rate following an ignition pulse and has not reached the first value (19) again after a predetermined period of time (15).In addition, a heating device (1) and a computer program product (22) are proposed.