Abstract
The goal of this experiment is to assess the mass and volume loss of medium size pine wood particles undergoing pyrolysis. Wood samples of different sizes and shapes were pyrolysed at 500 ºC with different residence times. A thermogravimetric analysis was carried out for comparison purposes. Finally, the pyrolysed samples were analysed using radiographic methods. A connection between the different analyses was found. For larger particles, the heating rate is lower, and a time gap between hemicellulose and cellulose thermal decomposition was noticed. Research shows that an important part of the analysis of the process is the rate of biomass heating and sample size. As the sample size increases, the pyrolysis time increases; however, the increase is not linear. The publication also shows the great possibilities of radiographic methods in analysing the pyrolysis process.
Highlights
IntroductionEfforts can be seen all around the globe in the direction of gaining autonomy and independence from fossil fuels, pursuing a decrease on greenhouse gas emissions and more sustainable energy future
The mass, volume and density variations after pyrolysis at 500 oC were compared for different kinds of samples at equal residence times (Figures 2-7)
It is to be noticed that one single comparison between all kinds of samples was not possible, due to different residence time intervals tested for each shape
Summary
Efforts can be seen all around the globe in the direction of gaining autonomy and independence from fossil fuels, pursuing a decrease on greenhouse gas emissions and more sustainable energy future. A possible path is the use of solid biomass, which can be pyrolysed or gasified, either alone or coprocessed with coal. Pyrolysis is the thermal decomposition of organic matter in the absence of oxygen, with temperatures ranging from 200 oC to 600 oC. Chemical compounds are decomposed into lighter ones due to several reactions mostly of endothermic nature. The products of pyrolysis are char, bio-oil and gas, the quality and quantity of each product produced being highly influenced by the temperature, residence time, heating rate and size and shape of the particle
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