Gas Burner Pressure Regulation via Dynamic Valve Control
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Solution Overview
Problem
Fully premixing gas burners face instability and flashback risks due to pressure fluctuations caused by wind and low burner modulation rates, especially when starting with a cold mixture and combustion chamber, leading to unstable combustion processes.
Innovation Solution
A method involving high sampling rate pressure difference measurement between air and gas supplies, low-pass filtering, and dynamic intervention in gas valve and fan settings to regulate pressure differences and minimize scatter, using multiple threshold values to stabilize combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low burner modulation rates are used, then energy efficiency is improved, but combustion stability deteriorates leading to flashback risk
Solution Approach 1:
The patent implements dynamic control of the mixing ratio between combustion air and fuel gas based on real-time pressure fluctuation detection. When pressure fluctuations indicate unstable combustion, the system dynamically adjusts the mixing ratio to maintain stability, enabling safe operation at low burner modulation rates that would otherwise cause flashback.
Solution Approach 2:
The system uses pressure sensors to continuously monitor pressure fluctuations in the combustion chamber and feeds this information back to the control unit. This feedback loop allows the system to detect unstable combustion conditions and adjust the gas valve and fan speed accordingly, maintaining combustion stability even at low burner modulation rates.
2Measurement precision
If high sampling rate pressure measurement is implemented, then detection precision is improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it regulates the gas valve to maintain pressure difference, controls fan speed, and detects pressure fluctuations by analyzing scattered measured values. By making the control unit multi-functional, the patent achieves high measurement precision without adding separate dedicated hardware for each function.
Solution Approach 2:
The patent combines the pressure measurement function with the existing control unit that already manages gas valve and fan operations. The control unit processes pressure data from sensors and uses this information for both regulation and stability detection, merging measurement and control functions into a single integrated system.
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 method effectively reduces the risk of flashback and flame loss by stabilizing combustion processes, even under windy conditions and low flow velocities, by dynamically adjusting gas valve and fan operations based on measured pressure fluctuations.
Implementation Method 1
the measuring device (7) measures the pressure difference between air supply and gas supply via connecting lines (13, 14)
Implementation Method 2
In the first branch, the measured values are initially low-pass filtered
Implementation Method 3
an ignitable air-fuel gas mixture is first provided by means of a mixing device, which is then fed to a burner for combustion
Data Source
Figure 1
AI summary
The method involves detecting the pressure difference between air and gas supply (5,6) by measuring device (7) in mixing device (3) at high sampling rate. The variability in measured values of differential pressure is determined. The low-pass filtering of the measured values is performed. The control of gas valve (8) is performed, such that pressure difference is compensated to zero. The control variables such as position of the gas valve or the minimum speed of the blower (1) are associated, when the reference value is exceeded by a threshold value.