Macro-TG apparatus and data processing method for the kinetic analysis of cooking oil tar

Author(s): Xie Zheng-Wen

The curves of combustion characteristics of cooking oil tar in pipe were obtained by using a self-designed thermogravimetric (TG) device with a large capacity. The wavelet transform was introduced into the thermogravimetric data smoothing and differentiation analysis according to the experimental results, and the orthogonal test method was used to find the optimizedwavelet parameters. The wavelet transformresults were compared with the traditional ‘Moving Average’, ‘Gaussian Smoothing’ and ‘Vondrak Smoothing’ methods and it shows that the signal-to-noise ratio of the measurement is increased and root-mean-square (RMS) error is decreased. The kinetic parameters calculated fromthe original TG curves and smooth differential thermogravimetric (DTG) curves are in good agreement, thus the wavelet transform smoothing algorithms can be used directly and accurately in the thermokinetic analysis.

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