Nano-object Release Characterization via Controlled Combustion
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Solution Overview
Problem
There is a lack of effective methods to characterize and quantify the release of nano-objects, such as nanoparticles and nanofibers, during the combustion or thermal treatment of nanostructured waste, which poses risks to human health and the environment due to incomplete combustion or thermal stress.
Innovation Solution
An installation comprising a furnace with differential thermal and thermogravimetric analysis capabilities, connected to a gas sampling and filtration system, is designed to promote the release of nano-objects into the gas phase under controlled conditions, allowing for their continuous and cumulative collection and analysis using a transmission electron microscope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature combustion is used to analyze nano-objects, then combustion efficiency is improved, but nano-objects are completely combusted and cannot be detected
Solution Approach 1:
The patent applies dynamic control of combustion conditions by adjusting oxygen flow rate and temperature profile in real-time. The system transitions from high-temperature complete combustion to controlled low-temperature incomplete combustion, allowing nano-objects to be released into gas phase without being completely combusted, thus enabling both efficient analysis and detection
Solution Approach 2:
The patent changes key combustion parameters including temperature, oxygen concentration, and residence time to optimize nano-object release. By controlling these parameters, the system achieves sufficient combustion to release nano-objects while preventing their complete oxidation, enabling detection in the gas phase
2Loss of energy
If complete combustion is used to treat nanostructured waste, then energy recovery is improved, but nano-objects are destroyed and emission assessment becomes impossible
Solution Approach 1:
The patent applies partial combustion action by controlling the combustion process to achieve only the necessary degree of oxidation for energy recovery while stopping before complete combustion occurs. This partial action allows nano-objects to be released for detection while still achieving significant energy recovery from the waste material
Solution Approach 2:
The patent performs preliminary characterization of nano-objects before complete combustion by analyzing the gas phase products during controlled combustion. This preliminary action provides emission data before the nano-objects are completely destroyed, enabling both energy recovery assessment and emission characterization
3Device complexity
If standard combustion equipment is used, then device simplicity is maintained, but nano-object release into gas phase is insufficient for detection
Solution Approach 1:
The patent makes standard combustion equipment multi-functional by adding a gas sampling system that can extract and concentrate nano-objects from the combustion gas phase. This modification allows the same equipment to perform both combustion and nano-object characterization functions, maintaining simplicity while enabling detection
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 enables the identification and quantification of nano-objects in gaseous discharges, providing a risk assessment for exposure during the production, use, and end-of-life scenarios of nanostructured materials, facilitating the design of safer handling and filtration systems.
Implementation Method 1
the appearance of significant thermal stresses inside this waste
Implementation Method 2
in the event of incomplete (or even complete) combustion or thermal stress applied to products or waste
Implementation Method 3
A gaseous flow allows the release of nano-objects from this material and their transport towards the filtration device
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
Installation for characterizing the risk of release of products or waste containing nano-objects, comprising a furnace adapted to be traversed by a gas flow following a longitudinal direction of this furnace and comprising a first receptacle with a porous wall adapted to receive a sample of this product or waste and a second receptacle with an open porous wall adapted to receive a reference sample which is inert with respect to the gas flow and equipped with a differential thermal and thermogravimetric analysis device connected to these two receptacles, a device for evacuating and filtering gaseous emissions connected to the outlet of the furnace and capable of retaining any nano-objects contained in these gaseous emissions and a gas sampling device, adapted to sample a part of the gaseous emissions and containing a filter adapted to allow subsequent analysis of any nano-objects retained by this filter.