Multi-Burner Combustion Control via Mode-Segmented Shutoff Logic
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Solution Overview
Problem
Conventional multi-burner combustion systems face challenges in balancing safety and stability, as existing zone lockout conditions either prioritize safety and stop all burners upon any failure, leading to stability concerns, or prioritize stability and continue operation despite burner failures, compromising safety.
Innovation Solution
A combustion controlling device that distinguishes between initial startup and normal operation modes, using separate shutoff conditions to manage burner operations, allowing continued operation when necessary while ensuring safety by stopping all burners only when specific conditions are met, such as when one burner fails during startup or multiple burners experience flame failure during normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a zone lockout condition is set to stop all burners when any single burner fails to ignite, then safety is improved, but combustion stability and continuity deteriorate
Solution Approach 1:
The patent segments the zone lockout control into two distinct modes: initial startup mode and normal operation mode. Each mode has its own shutoff condition criteria. During initial startup, a single burner failure triggers zone lockout, while during normal operation, multiple burner failures are required to trigger lockout. This segmentation allows the system to apply different safety thresholds appropriate to each operational phase, resolving the contradiction between safety and stability.
Solution Approach 2:
The patent implements dynamic adjustment of shutoff conditions based on the operational state of the combustion system. The control device automatically transitions between initial startup mode and normal operation mode, changing the criteria for zone lockout accordingly. This dynamic behavior allows the system to be more stringent during startup when safety is paramount, and more permissive during normal operation to maintain stability, thus resolving the fixed contradiction.
2Stability of the object's composition
If a zone lockout condition is set to allow continued operation when multiple burners fail, then combustion stability is improved, but safety deteriorates
Solution Approach 1:
The patent divides the operational lifecycle into distinct segments with different safety requirements. During initial startup, the system applies strict safety criteria where any burner failure triggers zone lockout. During normal operation, the system applies more relaxed criteria allowing continued operation with some burner failures. This segmentation resolves the contradiction by applying context-appropriate thresholds.
Solution Approach 2:
The patent changes the parameter of shutoff condition threshold based on operational mode. In initial startup mode, the threshold is set to 1 burner failure, while in normal operation mode, the threshold is set to multiple burner failures. This parameter change allows the system to adapt its safety-stability balance according to the operational context, resolving the contradiction.
3Device complexity
If a fixed zone lockout condition is applied to all operational states, then device complexity is reduced, but adaptability to different operational phases deteriorates
Solution Approach 1:
The patent implements a dynamic control system that automatically adjusts the zone lockout criteria based on the current operational mode. The control device monitors the combustion state and transitions between initial startup mode and normal operation mode, applying appropriate shutoff conditions for each phase. This dynamic adaptation resolves the contradiction by allowing the system to be context-aware without requiring complex manual configuration.
Solution Approach 2:
The patent creates a universal control framework that handles multiple operational phases (initial startup and normal operation) within a single zone lockout control mechanism. The control device universally applies the appropriate shutoff condition based on the detected operational mode, eliminating the need for separate control systems for each phase while maintaining adaptability to different operational requirements.
Data Source
AI summary
Safety and stability of combustion are improved by a combustion controlling device that controls the operation of 2 or more burners and stops all the operation of the burners when combustion states of the burners satisfy a predetermined condition, and the predetermined condition includes a first shutoff condition for stopping the operation of the burners at the time of an initial startup to ignite a desired burner from a state in which none of the burners is ignited, and a second shutoff condition for stopping the operation of the burners in a normal operating state after the desired burner has been normally ignited by the initial startup.