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TECHNICAL PAPERS: Gas Turbines: Coal, Biomass, and Alternative Fuels

Rotary Kiln Slow Pyrolysis for Syngas and Char Production From Biomass and Waste—Part I: Working Envelope of the Reactor

[+] Author and Article Information
Francesco Fantozzi

Department of Industrial Engineering, University of Perugia, Via G. Duranti 67, 06125 Perugia, Italyfanto@unipg.it

Simone Colantoni

Department of Industrial Engineering, University of Perugia, Via G. Duranti 67, 06125 Perugia, Italysimone_colantoni@unipg.it

Pietro Bartocci

Biomass Research Center, University of Perugia, Via M. Iorio 8, 06125 Perugia, Italybartocci@crbnet.it

Umberto Desideri

Department of Industrial Engineering, University of Perugia, Via G. Duranti 67, 06125 Perugia, Italyumberto.desideri@unipg.it

J. Eng. Gas Turbines Power 129(4), 901-907 (Jan 04, 2007) (7 pages) doi:10.1115/1.2720521 History: Received July 11, 2006; Revised January 04, 2007

A microscale electrically heated rotary kiln for slow pyrolysis of biomass and waste was designed and built at the University of Perugia. The reactor is connected to a wet scrubbing section, for tar removal, and to a monitored combustion chamber to evaluate the lower heating value of the syngas. The system allows the evaluation of gas, tar, and char yields for different pyrolysis temperatures and residence times. The feeding screw conveyor and the kiln are rigidly connected; therefore, a modification of the flow rate implies a modification of the inside solid motion and of residence time. The paper provides the theoretical and experimental calculation of the relationships between residence time and flow rate used to determine the working envelope of the reactor as a function of the feedstock bulk density and moisture content, given the actual heat rate of the electric heaters. The methodology is extendable to any rotary kiln reactor with a rigidly connected feeding screw conveyor, given its geometric and energetic specifications. Part II of the paper will extend the energy balance, also introducing the yields of pyrolysis products.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Test bench layout (1)

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Figure 2

Graphic—experimental calculation of the dynamic angle of repose for pellet (above) and wood chips (below)

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Figure 3

Graphic—experimental calculation of the friction angle for wood chips

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Figure 4

Steady state mass flow for pellet and wood chips

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Figure 5

Colored tracers for MET evaluation

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Figure 6

MET normal distribution for pellets

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Figure 7

MET normal distribution for wood chips

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Figure 8

Working envelope of the reactor

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Figure 9

Working envelope of the reactor for different internal diameters of rotary kiln

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