Master-Slave Combustion Control for Multi-Burner Safety
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Solution Overview
Problem
In multi-burner combustion systems, the current methods for controlling fuel supply using a common safety shutoff valve are inadequate, leading to safety concerns during ignition due to the potential for unburned gases to enter the combustion chamber when pseudo flames are detected, as communication between burner controllers and the master controller is indirect, resulting in delayed shutdown of fuel supply.
Innovation Solution
A combustion controlling system with a master device that controls a common safety shutoff valve and multiple slave devices, where each slave device determines the presence of a flame and outputs a signal to the transmission line, allowing the master device to manage the valve based on collective input, ensuring the valve is closed only when all burners are ready to ignite, preventing unburned gas from entering the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common safety shutoff valve is used for all burners to reduce equipment complexity and cost, then device complexity is reduced and installation space is saved, but safety reliability deteriorates because the master controller cannot detect pseudo flames at individual burners and cannot shut off fuel supply promptly when pseudo flames are detected by slave controllers
Solution Approach 1:
The control system is segmented into a master controller and multiple slave controllers, where each slave controller independently monitors its respective burner for pseudo flames. This segmentation allows distributed detection while maintaining a centralized valve control structure, resolving the contradiction between simplified hardware and reliable safety monitoring.
Solution Approach 2:
A feedback mechanism is implemented where slave controllers continuously monitor combustion states and immediately notify the master controller when pseudo flames are detected. This real-time feedback enables the master controller to promptly shut off the common safety shutoff valve, maintaining safety reliability despite using a single valve for all burners.
2Device complexity
If indirect communication through the safety controlling device is used between burner controllers, then device configuration is simplified, but response time deteriorates causing delayed shutdown of fuel supply when pseudo flames are detected
Solution Approach 1:
Slave controllers are pre-configured with pseudo flame detection capabilities and immediate notification protocols to the master controller. This preliminary setup ensures that when pseudo flames occur, the detection and notification process can execute immediately without requiring complex real-time communication negotiations, thus reducing response time while maintaining simplified indirect communication architecture.
Data Source
AI summary
A combustion controlling system according to the present invention provides a signal path for transmitting an ignition preparation signal SA output from a master device to a transmission line through cascade-connected slave devices. Then, each of the slave devices determines whether each of the slave devices outputs the ignition preparation signal to a subsequent device, or not, based on whether there is a flame of the corresponding burner, or not, at the time of igniting the burners, and the master device opens a safety shutoff valve on the condition that an ignition preparation signal SAo has been input from the transmission line.