Vapor Cloud Explosion Mitigation via Chemical Inhibition
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Solution Overview
Problem
Current methods for mitigating vapor cloud explosions (VCEs) in petrochemical plants and refineries are not reliable enough, as they often fail to prevent the devastating overpressures caused by flame acceleration in accidental releases of flammable gases, which can lead to equipment damage and destruction.
Innovation Solution
A method involving a network of detector devices that detect flammable gas presence and trigger the release of a flame acceleration suppression product within the hazardous area, ensuring that the product covers the entire area to prevent flame acceleration and transform the flammable cloud into a non-explosive burning flash fire, using multiple detectors for confirmation and continuous release to ensure reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flame acceleration suppression product is released to prevent VCE, then overpressure and equipment damage are reduced, but system complexity and cost increase due to detector networks and control systems
Solution Approach 1:
The system performs preliminary detection of flammable gas clouds and pre-releases the flame acceleration suppression product before ignition occurs. This proactive approach transforms the flammable cloud into a non-explosive mixture in advance, preventing VCE and overpressure damage before they can develop
Solution Approach 2:
The flame acceleration suppression product acts as a chemical intermediary substance that mediates between the flammable gas cloud and potential ignition sources. When released, it chemically interacts with the flammable mixture to inhibit flame acceleration and prevent detonation, serving as a protective mediator
2Reliability
If multiple detector devices are used to confirm flammable gas presence, then reliability of mitigation is improved, but device complexity and response time increase
Solution Approach 1:
The system employs multiple detector devices that continuously monitor the hazardous area and provide feedback signals to the control system. When detectors confirm flammable gas presence through voting logic, the control system responds by activating the suppression product release, creating a closed-loop feedback control mechanism that enhances reliability
Solution Approach 2:
Multiple detector devices are strategically positioned throughout the hazardous area to provide localized detection coverage. Each detector monitors its specific zone, and the system integrates these local detections to make a global safety decision, ensuring comprehensive and reliable detection without excessive complexity
3Object-affected harmful factors
If flame acceleration suppression product is released early to prevent VCE, then equipment damage is reduced, but loss of flammable gas increases due to inability to burn
Solution Approach 1:
The system accepts that the flammable gas may be lost as a acceptable trade-off for protecting expensive equipment and infrastructure. The flammable gas cloud, while valuable, is considered a disposable resource whose potential energy release is sacrificed to prevent catastrophic damage to permanent equipment and facilities
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 approach effectively reduces the risk of equipment damage by transforming potentially explosive flammable gas clouds into non-explosive burning clouds, preventing the transition from deflagration to detonation and minimizing overpressures, thus providing a safer and more reliable mitigation of VCEs.
Implementation Method 1
Mitigation of vapor cloud explosion by chemical inhibition
Data Source
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AI summary
A method to mitigate the consequences of a vapor cloud explosion due to an accidental release of a flammable gas in an open area, comprising: defining an hazardous area wherein an accidental release of flammable gas is likely to happen; receiving (300, 305) a signal from a detector device able to detect the presence of the flammable gas within the hazardous area, upon reception of a signal indicating the presence of the flammable gas within the hazardous area, generating (309) a control signal to activate a release of a flame acceleration suppression product in the hazardous area, at a rate that is determined as a function of the volume of said hazardous area.