Gas Appliance Combustion Control for Variable Heating Value
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Solution Overview
Problem
Natural gas appliances face inefficiencies and safety issues due to variations in heating values, leading to incomplete combustion or poor efficiency when higher or lower heating value gas is used without proper adaptation.
Innovation Solution
A gas appliance with a combustion device, ignitor, gas valve, blower, and detecting device, controlled by a control device that determines the burning state and adjusts gas and air flow to match the specific heating value of the natural gas, switching between operation modes for optimal combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If natural gas with higher heating value is directly injected into the transmission pipeline, then the heating value of the supplied gas increases, but incomplete gas combustion occurs resulting in too much carbon monoxide
Solution Approach 1:
The control device performs preliminary detection of the natural gas heating value before combustion operation. By detecting the heating value in advance and pre-adjusting the gas flow and air flow parameters to match the detected heating value, the system prevents incomplete combustion and carbon monoxide generation before they occur
Solution Approach 2:
The control device continuously detects the heating value of natural gas and adjusts the gas flow and air flow parameters based on the detected values. This closed-loop feedback mechanism ensures that the combustion parameters always match the actual heating value, preventing carbon monoxide emission while maintaining efficient combustion
2Quantity of substance
If natural gas with lower heating value is directly injected into the transmission pipeline, then the heating value of the supplied gas decreases, but poor combustion efficiency of the gas appliance occurs
Solution Approach 1:
The control device performs preliminary detection of the natural gas heating value before combustion operation. By detecting the heating value in advance and pre-adjusting the gas flow and air flow parameters to match the detected heating value, the system ensures optimal combustion efficiency regardless of whether the heating value is high or low
Solution Approach 2:
The control device changes the combustion parameters (gas flow rate and air flow rate) according to the detected heating value. When lower heating value gas is detected, the system adjusts the parameters to optimize combustion efficiency, ensuring that the appliance performs well across different heating value conditions
3Device complexity
If the gas appliance uses fixed gas flow and air flow settings, then the device complexity is reduced, but the appliance cannot adapt to different heating values of natural gas
Solution Approach 1:
The control device incorporates a heating value detection mechanism that continuously monitors the natural gas properties and provides feedback to the control system. This feedback enables automatic adjustment of gas flow and air flow parameters, providing adaptability to different heating values while keeping the user interface simple
Solution Approach 2:
The control device automatically detects the heating value and adjusts the combustion parameters without requiring user intervention. The system serves itself by autonomously adapting to different gas conditions, maintaining simplicity for the user while providing complex adaptation capabilities
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
Ensures efficient combustion by determining the natural gas type and adjusting parameters to match its heating value, preventing carbon monoxide issues and maintaining optimal performance.
Implementation Method 1
The ignitor is disposed beside the combustion device to ignite the natural gas output by the combustion device
Implementation Method 2
The detecting device is for detecting the burning states of the flames of the combustion device
Data Source
Figure 1
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AI summary
A gas appliance (1, 2, 3, 4, 5, 6, 7) comprises a combustion device (10, 26), an ignitor (12), a gas valve (14, 30), a blower (16, 32), a detecting device (34), and a control device (20, 36). A control method thereof comprises: the control device (20, 36) is operated in a detection mode in which the control device (20, 36) controls the ignitor (12) to ignite and controls the gas valve (14, 30) as well as the blower (16, 32) to provide a fixed gas flow and a fixed air flow to the combustion device (10, 26). After igniting the flames, the control device (20, 36) determines burning states detected by the detecting device (34); if matching a first state, the control device (20, 36) controls the gas valve (14, 30) and the blower (16, 32) in correspondence to a first control data of the first natural gas; if matching the second state, the control device (20, 36) controls the gas valve (14, 30) and the blower (16, 32) in correspondence to a second control data of the second natural gas. In this way, the gas appliance (1, 2, 3, 4, 5, 6, 7) is suitable for natural gas with various heating values.