CF3I, HCFOs, and CO2 Fire Suppressant Blend for Thermal Stability

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Solution Overview

Problem

Current fire suppression agents for aircraft cargo compartments, such as Halon 1301, are ozone-depleting and face phase-out deadlines, while alternatives like HFCs and HCFOs fail critical fire suppression tests or have undesirable properties, and CF3I is less thermally stable and fails bulk load fire tests.

Innovation Solution

A fire suppressant blend comprising CF3I, hydrofluoro-olefins (HFO) or hydrochlorofluoro-olefins (HCFO), and carbon dioxide (CO2) is developed, with cooling agents added to stabilize CF3I and enhance fire suppression efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CF3I is used as a fire suppressant, then fire suppression efficiency is improved, but thermal stability deteriorates causing decomposition in the preheat zone

Engineering Contradiction:

Improvefire suppression efficiencyVSAvoidthermal stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent introduces cooling agents (HFOs, HCFOs, and CO2) as intermediary substances that mediate between the fire suppressant CF3I and the thermal environment. These cooling agents absorb heat and lower the temperature in the preheat zone, preventing CF3I decomposition while maintaining fire suppression effectiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the temperature parameter in the preheat zone by introducing cooling agents that reduce the temperature. This parameter change prevents CF3I from decomposing at high temperatures while maintaining its fire suppression properties at the fire interface.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If HFCs and 2-BTP are used as fire suppressants, then ozone depletion is prevented, but fire suppression performance deteriorates by exacerbating aerosol explosions

Engineering Contradiction:

Improveozone depletionVSAvoidfire suppression performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent converts the potentially harmful reaction of HFOs/HCFOs with aerosol explosions into a beneficial effect by carefully controlling their concentration and combining them with CF3I and CO2. The blend ensures that these substances do not exacerbate explosions while maintaining fire suppression performance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If Halon 1301 is used as a fire suppressant, then fire suppression performance is maintained, but environmental harm increases due to ozone depletion

Engineering Contradiction:

Improvefire suppression performanceVSAvoidozone depletion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the fire suppressant system by replacing Halon 1301 with a blend of CF3I, HFOs/HCFOs, and CO2. This parameter change eliminates ozone-depleting substances while maintaining fire suppression effectiveness through the synergistic combination of components.

Inventive Principle:

Principle #35Parameter changes

4Object-affected harmful factors

If inert gas and water mist are used as fire suppressants, then aerosol explosion safety is improved, but system size and weight increase making them unacceptable for aircraft

Engineering Contradiction:

Improveaerosol explosion safetyVSAvoidsystem weight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of moving object

Solution Approach 1:

The patent changes the physical and chemical parameters of the fire suppressant by using a gaseous blend of CF3I, HFOs/HCFOs, and CO2 instead of liquid water mist or heavy inert gas systems. This parameter change achieves aerosol explosion safety with significantly reduced system weight and volume suitable for aircraft applications.

Inventive Principle:

Principle #35Parameter changes

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

The blend effectively suppresses fires, passing critical suppression tests and maintaining thermal stability, offering a viable alternative to Halon 1301 with reduced volume and toxicity.

Implementation Method 1

CF3I is less thermally stable than Halon 1301, and the agent decomposed in the 'preheat zone', i.e. en route to the fire

Methodology Applied

Scientific EffectThermal decomposition: Decomposition (biological)

Implementation Method 2

HCFOs have also been tested against the simulated exploding aerosol canister, and they also exacerbate the explosion if tested at a concentration below the inerting concentration

Methodology Applied

Scientific EffectEndothermic reaction: Endothermic Reaction

Implementation Method 3

A mixture of one of more HCFOs/HFOs with and carbon dioxide is used as the cooling agent in the blend with CF3I

Methodology Applied

Scientific EffectPhysical cooling: Cooling

Implementation Method 4

A fire suppressant blend comprises CF3I, at least one hydrofluoro-olefin (HFO) or hydrochlorofluoro-olefin (HCFO), and carbon dioxide

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Data Source

PatentUS12415108B2Fire suppression blends of CF3I, HCFOs and CO2

Publication Date: 2025.09.16 KIDDE TECHNOLOGIES INC

AI summary

A fire suppressant blend comprises CF3I; at least one hydrofluoro-olefin (HFO) or hydrochlorofluoro-olefin (HCFO), or both; and carbon dioxide.