Reusable Oxygen-Activated Package Heater Without Water Mixing
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Solution Overview
Problem
Current portable flameless heaters, such as magnesium/iron mixtures and quicklime-based systems, face issues with hydrogen gas byproducts, water requirements, limited peak temperature, and reduced portability due to weight and size constraints, making them less suitable for consumer applications and requiring additional complexity for reactant mixing.
Innovation Solution
A portable flameless heating apparatus utilizing a flexible porous substrate with a reducing agent, promoter, and binding agent that reacts with ambient oxygen, eliminating the need for added water and allowing controlled heat generation and cessation, with a resealable design and air-metering pump for efficient oxygen management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water-based heaters (Mg/Fe mixture) are used to generate heat, then high temperature rise is achieved, but hydrogen gas is produced creating safety concerns and transportation restrictions
Solution Approach 1:
The invention changes the chemical reaction parameters by replacing water-based Mg/Fe chemistry with oxygen-based chemistry using a porous substrate impregnated with reducing agents. This fundamental parameter change eliminates hydrogen gas production while maintaining effective heat generation through oxidation reactions with ambient oxygen.
Solution Approach 2:
The patent employs strong oxidation of the porous substrate by ambient oxygen to generate heat. The porous structure accelerates the oxidation reaction by providing large surface area contact between the reducing agent and oxygen, achieving effective temperature rise without producing harmful hydrogen gas.
2Object-affected harmful factors
If quicklime (CaO) and water are mixed to generate heat, then hydrogen-free heating is achieved, but specific energy is low and heater weight approaches object weight
Solution Approach 1:
The invention changes the reactant system from water-based quicklime to oxygen-based porous substrate. This parameter change eliminates the need for water while using ambient oxygen as the oxidant, dramatically reducing heater weight and volume while maintaining hydrogen-free operation.
Solution Approach 2:
The porous heater utilizes ambient oxygen from the environment as the oxidant, eliminating the need to carry water or other oxidizing agents. This self-service approach to oxygen supply reduces the heater's weight and volume to only the essential porous substrate and reducing agent.
3Quantity of substance
If water is added to activate the heater, then the chemical reaction is initiated, but the process becomes inconvenient and drinking water supply is depleted
Solution Approach 1:
The porous heater automatically reacts with ambient oxygen upon exposure, eliminating the need for manual water addition. The device uses itself and the environment (oxygen) to initiate and sustain the reaction, making activation as simple as exposing the porous substrate to air.
Solution Approach 2:
The porous substrate is pre-impregnated with reducing agents and prepared in advance during manufacturing. This preliminary preparation allows the heater to be activated simply by exposing it to oxygen, without requiring the user to add water or perform other activation steps at the point of use.
4Ease of operation
If self-contained heating systems are designed to be portable, then heating function is achieved, but device complexity increases due to mixing mechanisms and packaging
Solution Approach 1:
The invention extracts and eliminates the complex mixing mechanisms and water containment packaging from the system. By using a pre-prepared porous substrate that reacts directly with ambient oxygen, the patent removes unnecessary components while maintaining portability and heating function.
Solution Approach 2:
The use of a porous substrate provides both the structural framework and the reaction medium in a single integrated component. The porous structure naturally facilitates oxygen diffusion and reaction without requiring mechanical mixing devices, simplifying the overall device architecture while maintaining portability.
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 solution provides a safe, efficient, and portable heating system that can be initiated and stopped multiple times, using ambient oxygen to generate heat without water, offering improved safety, reduced weight, and enhanced portability, suitable for various applications including heating sanitary wipes.
Implementation Method 1
a reducing agent providing an exothermic reaction upon oxidation
Implementation Method 2
a reducing agent providing an exothermic reaction upon oxidation
Data Source
AI summary
A heater in a housing with an opening. The heater reacts with oxygen to produce heat and upon consumption of the oxygen, the heating reaction stops and can be restarted at a later point in time upon the introduction of additional oxygen and is used in a package for heating pre-moistened substrates such as sanitary wipes, and the like.