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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 II: Introducing Product Yields in the Energy Balance

[+] 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), 908-913 (Jan 05, 2007) (6 pages) doi:10.1115/1.2720539 History: Received July 11, 2006; Revised January 05, 2007

## Abstract

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 temperature and residence time. 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. Part I of the paper describes the theoretical and experimental evaluation of the working envelope of the reactor, that is, rotational speed as a function of feedstock density and humidity content, to obtain pyrolysis conditions inside the kiln. This paper describes the development and resolution of an energy balance of the reactor under pyrolysis conditions. Once the rotational speed $n$ is fixed, the aim of the balance is to obtain the yield of wood biomass pyrolysis products such as syngas, tar, and char. Results can be used to choose the correct rotational speed of kiln and feeding screw before doing the real pyrolysis test.

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## Figures

Figure 1

Simplified scheme for biomass pyrolysis as derived from (10)

Figure 2

Temperature as a function of residual time after PRT (ρ=200kg∕m3; %m=10%; 1.385rpm)

Figure 3

Residual dry biomass and pyrolysis products yields as function of residual time after PRT (ρ=200kg∕m3; %m=10%; 1.385rpm)

Figure 4

Residual dry biomass and pyrolysis products yields as function of axial length (ρ=200kg∕m3; %m=10%; 1.385rpm)

Figure 5

Residual dry biomass and pyrolysis products yields as function of axial length (ρ=200kg∕m3; %m=20%; 1.385rpm)

Figure 6

Residual dry biomass and pyrolysis products yields as function of axial length (ρ=200kg∕m3; %m=20%; 1.17rpm)

Figure 7

Residual dry biomass and pyrolysis products yields as function of axial length (ρ=300kg∕m3; %m=30%; 0.75rpm)

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