Flame-Separation Combustor for Soot-Limited Polymer Calorimetry
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Solution Overview
Problem
Existing combustion diagnostic techniques face challenges in monitoring combustion of solid/liquid fuels, particularly polymers, due to the interference caused by soot and the need for external flames, which complicates the measurement of free radicals and undermines the accuracy of optical diagnostics.
Innovation Solution
A soot-suppression flame-separation combustion device that separates the combustion zone into an inner flame for pyrolysis and an outer flame for ignition, using a specialized oxidizing flame separation guide member to confine soot formation and minimize interference, allowing for in-situ free radical monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external gas flame is used to support polymer pyrolysis and initiate combustion, then the polymer combustion process can be sustained, but strong interference is caused to free radical monitoring
Solution Approach 1:
The combustion device is segmented into distinct zones: a pyrolysis zone where the polymer sample decomposes without external flame interference, and a separate combustion zone where the volatile products burn. This spatial segmentation allows free radical monitoring in the pyrolysis zone to be free from the interference of the external flame used to sustain combustion.
Solution Approach 2:
The patent uses an intermediary approach by allowing the polymer's own pyrolysis products to act as the fuel for combustion, rather than using an external gas flame. The volatile matter released from pyrolysis serves as the intermediate that sustains combustion without introducing external flame interference into the monitoring zone.
2Measurement precision
If polymer combustion is monitored using optical diagnostic techniques, then in-situ free radical monitoring is enabled, but soot incandescence causes strong luminosity/scattering/absorption that reduces measurability
Solution Approach 1:
The patent extracts or removes the harmful soot formation from the pyrolysis zone by separating the combustion process into a distinct zone. The pyrolysis occurs in one zone where free radicals can be monitored, while the combustion (where soot would form) occurs in a separate zone, thereby taking out the interference source from the measurement area.
Solution Approach 2:
The patent introduces a spatial dimension separation by creating distinct zones for pyrolysis and combustion. Instead of having both processes occur in the same space causing interference, the solution moves the combustion process to another spatial dimension (separate zone), allowing optical diagnostics to work effectively in the pyrolysis zone.
3Reliability
If a conventional combustion device is used for polymer combustion, then the combustion process can be maintained, but soot formation substantially reduces the measurability of the combustion zone
Solution Approach 1:
The combustion device is segmented into distinct functional zones: a pyrolysis zone for sample decomposition and a separate combustion zone for burning volatile products. This segmentation allows the combustion process to be maintained reliably in the combustion zone while keeping the pyrolysis zone (where measurement occurs) free from soot interference.
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 device effectively suppresses soot formation, reducing interference and enhancing the applicability of spectral diagnostics in combustion monitoring, enabling accurate in-situ analysis of combustion processes.
Implementation Method 1
The inner flame retains most of the energy of the original flame, which can be used to support the continues pyrolysis of samples
Implementation Method 2
support the continues pyrolysis of samples
Implementation Method 3
the outer flame contains only a trace amount of active radicals
Implementation Method 4
mixing of the flammable volatile fuels with the oxidant, followed by homogeneous combustion in the gas phase
Implementation Method 5
Combustion is a phenomenon in which a substance glows and heats up as a result of intense oxidation
Implementation Method 6
the outer flame contains only a trace amount of active radicals, which can be used to ignite the pyrolysis products
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
The present invention provides a soot-suppression flame-separation combustion device for combustion calorimetry and in-situ free radicals monitoring. The combustion device is mainly composed of a premixed combustion gas guide tube, an inner flame generating seat, an oxidation flame separation guide, and a sample combustion chamber; the inner flame generating seat is arranged in the premixed combustion gas guide tube, the oxidation flame separation guide is arranged on the premixed combustion gas guide outlet end of the premixed combustion gas guide tube, the sample combustion chamber is a cavity arranged inside the oxidation flame separation guide, and the oxidation flame separation guide is evenly arranged with at least 4 oxidation flame separation guide paths in a manner of surrounding the sample combustion chamber. The combustion device utilizes the special structure of the oxidation flame separation guide to suppress the generation of smoke and limit the smoke particles to a specific combustion area, thereby reducing the interference of sample combustion smoke on the spectral diagnosis method and improving the applicability of spectral diagnosis in sample combustion monitoring.