Encapsulated Fire-Retardant Particles for Wildfire Control
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Solution Overview
Problem
Current aerial wildfire fighting solutions are inefficient due to the high water content in aqueous fire retardant solutions, which leads to drift and reduced active chemical delivery, and proactive products are susceptible to rainfall, making them ineffective in delivering the active chemical to the intended location.
Innovation Solution
A dry, fire-retardant product in the form of prills or particles with a core of ammonium phosphate and a waterproof shell that ruptures upon heating, releasing the active chemical directly to the fire, reducing drift and rainfall susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aqueous fire retardant solutions are used for aerial wildfire fighting, then the active chemical can be delivered to the fire, but the high water content causes significant drift and reduces active chemical delivery precision
Solution Approach 1:
The patent changes the physical state of the fire retardant from liquid (aqueous solution) to solid (encapsulated particles). This parameter change eliminates the drift issue inherent to liquid sprays while maintaining active chemical delivery capability. The solid encapsulated form allows for precise placement without being affected by wind drift.
Solution Approach 2:
The patent introduces an encapsulation shell as an intermediary carrier that contains the active chemical. This shell protects the active chemical during transport and deployment, allowing for precise delivery without the drift problems of liquid solutions. The intermediary shell enables the active chemical to be delivered in a controlled manner.
2Reliability
If aqueous fire retardant solutions are used proactively in advance of fires, then the area can be protected beforehand, but rainfall quickly washes away the product rendering it ineffective
Solution Approach 1:
The patent changes the physical state from liquid to solid encapsulated form. This parameter change makes the fire retardant resistant to rainfall, as the encapsulated solid particles are not easily washed away like liquid solutions. The solid form maintains its position and effectiveness even when exposed to rain.
Solution Approach 2:
The encapsulated particles are designed to be stable during storage and transport, resistant to rainfall and environmental factors. They remain effective until deployed when heat from the fire activates them, providing reliable proactive protection that isn't washed away by rain.
3Area of stationary object
If dilute aqueous solutions are sprayed from aerial crafts, then the fire retardant can be applied broadly, but less than 15% by weight is active chemical resulting in low active chemical delivery
Solution Approach 1:
The patent changes the formulation from dilute aqueous solution to concentrated encapsulated particles. This allows for much higher active chemical concentration (greater than 95% by weight) while still enabling broad aerial application. The solid particle form can be dispersed widely from aerial crafts while maintaining high active chemical content.
4Object-affected harmful factors
If viscosity thickening agents are added to aqueous solutions to reduce drift, then the solution becomes thicker, but drift reduction is insufficient and the solution remains primarily water
Solution Approach 1:
The patent changes the physical state from liquid to solid, which fundamentally eliminates drift rather than merely reducing it. This parameter change allows for high active chemical concentration without relying on thickening agents, as solid particles do not exhibit the drift behavior of liquid sprays.
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 dry product allows for precise aerial delivery with increased active chemical concentration, improved stability against rainfall, and enhanced effectiveness in extinguishing or reducing fire intensity, while reducing the need for water and lowering material costs.
Implementation Method 1
a waterproof shell encasing the core
Implementation Method 2
heating moisture within the waterproof shell utilizing the fire
Implementation Method 3
heating moisture within the waterproof shell utilizing the fire. The moisture within the shell heats up and expands until the shell ruptures
Implementation Method 4
the active chemical is typically phosphates or borates dissolved in an aqueous solution. These active chemicals, when within a fire, aid partial combustion of the cellulose fuel to char the surface of the burning material
Data Source
AI summary
A fire-retardant particle comprises a core formed of an aqueous solution and one or more inorganic compounds, which comprise ammonium phosphate. The particle further comprises a waterproof shell encasing the core. In an embodiment, a method of fighting a fire comprises encasing a hydrated fire-retardant compound in a waterproof shell of a fire-retardant particle. The fire-retardant particle is deployed in an area of fire. Moisture within the waterproof shell is heated by the fire. The waterproof shell ruptures as a result of the heated moisture so as to deploy the fire-retardant compound.