Visualization of Biomass Pyrolysis and Temperature Imaging in a Heated-Grid Reactor

The main advantage of a heated-grid reactor for studying pyrolysis kinetics of solid fuel samples is that high heating rates of up to 1000 K/s can be obtained. However, one of the concerns is whether the temperature distribution over the grid material is uniform and whether the presence of a thermocouple welded to the grid causes any measurement errors. Biomass samples were placed on the heated-grid reactor, and the volatiles, emitted in the biomass pyrolysis process as hot gas plumes, were imaged with an infrared camera with a high framing speed. The temporal resolved infrared images indicate that the pyrolysis process does not take place at the same rate everywhere on the grid. Two-dimensional temperature images of a heated grid made of stainless steel were recorded using the method of laser-induced thermometry with thermographic phosphors. As expected from a heat-transfer model, measured temperatures were found to be significantly higher than temperatures indicated by a thermocouple welded to the bottom of the grid. It was also observed that there is a large temperature gradient between the two electrodes on which the grid is connected. It is shown that replacing a wire mesh by a foil as a grid material may lead to more homogeneous temperature distribution. The paper recommends additional research to demonstrate the suitability of the heated-grid reactor for carrying out accurate measurements.

Lindén, JohannesLund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)forb-jal (author)
Li, ZhongshanLund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)forb-zli (author)
Bastiaans, R. J. M. (author)
van Oijen, J. A. (author)
Aldén, MarcusLund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)forb-mal (author)
de Goey, L. P. H. (author)
FörbränningsfysikFysiska institutionen (creator_code:org_t)

In:Energy & Fuels: American Chemical Society (ACS)23:1, s. 993-10060887-06241520-5029

By the author/editor: Prins, A. J.; Lindén, Johannes; Li, Zhongshan; Bastiaans, R. J. ...; van Oijen, J. A.; Aldén, Marcus; show more...; de Goey, L. P. H ...; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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