Burner Power Control Using Fuel Parameter and Air Ratio
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Solution Overview
Problem
Existing burner appliances face challenges in accurately determining power output due to variations in fuel composition, requiring complex adjustments of air and fuel actuators based on empirical characteristic curves and sensors, which are inefficient and labor-intensive.
Innovation Solution
A method for directly determining power output by measuring air supply and air ratio, using an individual scalar fuel parameter to calculate and regulate the power output, allowing for precise adjustment without needing extensive recalibration of characteristic curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If empirical characteristic curves and multiple sensors are used to determine power output, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential parameter for power output determination from the complex system of multiple sensors and characteristic curves. By using only the fuel parameter (heating value Hu) as the basis for calculation, it removes the need for air supply sensors, rotational speed measurements, and complex interpolation procedures, thereby simplifying the device while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the fundamental parameter used for power output determination from a complex multi-parameter system (air supply, fuel supply, rotational speed, differential pressure) to a single parameter system (fuel heating value Hu). This parameter change enables direct calculation of power output without requiring complex adjustment systems or multiple sensors.
2Ease of operation
If characteristic curves are predetermined and fixed functions are used, then ease of operation is improved, but adaptability deteriorates
Solution Approach 1:
The patent makes the power output determination system dynamic by allowing the fuel parameter Hu to vary with different fuel types. Instead of using fixed predetermined characteristic curves for different gas groups, the system dynamically calculates power output based on the actual heating value of the fuel being used, enabling automatic adaptation to any fuel type without manual recalibration.
Solution Approach 2:
The patent enables the system to adapt to different fuel types by changing the fuel parameter Hu in the calculation formula. This single parameter change allows the system to accommodate any fuel type (natural gas, propane, hydrogen, biogas, etc.) without requiring predetermined characteristic curves or manual adjustment, thus improving both ease of operation and adaptability.
3Reliability
If air ratio adjustment is performed to maintain constant lambda, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the relationship between fuel parameter, air ratio, and power output in the formula Pist = (h/λ) × VL. This allows the system to directly determine power output without performing time-consuming air ratio adjustments or waiting for lambda sensor readings, thus reducing adjustment time while maintaining reliability through the built-in consideration of air ratio in the calculation.
Data Source
AI summary
Various embodiments include a method for regulating a burner appliance comprising a combustion chamber, an air supply duct with an actuator to adjust the air supply, and a fuel supply duct with a fuel actuator to adjust the fuel supply. The method comprises: determining the value of the air supply V L; determining the value of an air ratio λ; providing an individual scalar fuel parameter h; calculating the power output P_ist of the appliance based on the air supply V L, the air ratio λ, and the individual scalar fuel parameter h using P_ist=h/λ·V L; and regulating the burner appliance with the fuel actuator and the air actuator until the actual value reaches the target value.