Flashback Detection and Ignition Inhibition in Atomic Absorption Spectrophotometers
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Solution Overview
Problem
Conventional flame atomic absorption spectrophotometers face challenges in preventing secondary accidents following a flashback event, as unskilled operators may inadvertently restart the apparatus without ensuring safety, potentially leading to further damage due to incomplete safety measures.
Innovation Solution
Incorporating a flashback detector, ignition inhibitor, and inhibition canceller with a secret re-ignition procedure, including a password system and flashback count memory, to prevent re-ignition by normal users and ensure only authorized personnel can safely resume operation after a flashback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional safety measures (pressure monitoring, flame intensity monitoring) are implemented, then the risk of flashback is reduced, but unskilled operators may still restart the apparatus after a flashback without ensuring safety
Solution Approach 1:
The patent implements a preliminary action by automatically setting the ignition inhibition flag when a flashback is detected. This prevents any subsequent ignition attempts until the inhibition is explicitly canceled through authorized procedures, ensuring safety checks are performed before allowing operation to resume
Solution Approach 2:
The patent introduces an intermediary mechanism (ignition inhibition system with password protection) that mediates between the flashback detection and potential re-ignition. This intermediary layer ensures that even if operators attempt to restart the apparatus, the system will not allow ignition until proper safety verification is completed
2Reliability
If automatic flame extinction and gas supply halt are implemented upon flashback detection, then gas leakage is prevented, but the apparatus cannot be resumed without complex authorization procedures
Solution Approach 1:
The patent applies local quality by implementing different authorization levels for different operations. Normal operators can perform routine operations, but only authorized personnel with passwords can cancel the ignition inhibition after a flashback, creating localized security measures where needed without complicating the entire system
Solution Approach 2:
The patent changes the system state by setting an ignition inhibition flag parameter when flashback occurs. This parameter remains active until explicitly canceled through authorized password input, providing a clear mechanical state change that prevents accidental restart while allowing controlled resumption by authorized personnel
3Ease of operation
If simple ignition button operation is allowed after flashback, then ease of operation is maintained, but secondary accidents may occur due to unrecognized apparatus damage
Solution Approach 1:
The patent implements preliminary anti-action by preemptively blocking the ignition function after flashback detection. The system anticipates the danger of secondary accidents from damaged apparatus and prevents ignition attempts until authorized personnel verify safety, countering potential harm before it can occur
Solution Approach 2:
The patent establishes a feedback mechanism where the system monitors for flashback conditions, automatically sets inhibition flags, and requires password verification before allowing ignition. This closed-loop feedback ensures that operators receive clear system feedback about the unsafe state and must obtain proper authorization before resuming operation
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
This configuration enhances safety by preventing unauthorized re-ignition and ensuring thorough assessment before resuming operation, reducing the risk of secondary accidents and maintaining apparatus integrity.
Implementation Method 1
a flashback detector for detecting an occurrence of a flashback phenomenon of the flame or detecting a state in which a flashback phenomenon is considered to have occurred
Implementation Method 2
an ignition inhibitor for inhibiting, in the case where a flashback is detected by the flashback detector, an ignition after the detection
Implementation Method 3
an inhibition canceller for canceling, in an ignition inhibit state created by the ignition inhibitor, the ignition inhibit state only by a predetermined operation which is secret at least to normal users
Data Source
AI summary
A flame atomic absorption spectrophotometer in which a combustion gas is burned by a burner to form a flame and a nebulized sample is atomized in the flame, including a flashback detector for detecting an occurrence of a flashback phenomenon of the flame or detecting a state in which a flashback phenomenon is considered to have occurred; a flashback count memory for counting detection of a flashback by the flashback detector and storing a number of count; an ignition inhibitor for inhibiting, in a case where a flashback is detected by the flashback detector, an ignition after the detection; and an inhibition canceller for canceling, in an ignition inhibit state created by the ignition inhibitor, the ignition inhibit state only by a predetermined operation which is changed in accordance with the number of count stored in the flashback count memory.