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RESEARCH PAPERS

Multitube Rotary Kiln for the Industrial Solar Production of Lime

[+] Author and Article Information
Anton Meier1

Solar Technology Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerlandanton.meier@psi.ch

Enrico Bonaldi, Gian Mario Cella

 QualiCal Srl, Via Verdi 3, I-24121 Bergamo, Italy

Wojciech Lipinski

Solar Technology Laboratory, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland Department of Mechanical and Process Engineering, ETH-Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland

1

Corresponding author.

J. Sol. Energy Eng 127(3), 386-395 (Apr 29, 2005) (10 pages) doi:10.1115/1.1979517 History: Received May 28, 2004; Revised April 29, 2005

We designed and tested a scaleable solar multitube rotary kiln to effect the endothermic calcination reaction CaCO3CaO+CO2 at above 1300K. The indirect heating 10-kW reactor prototype processes 15mm limestone particles, producing high purity lime of any desired reactivity and with a degree of calcination exceeding 98%. The reactor’s efficiency, defined as the enthalpy of the calcination reaction at ambient temperature (3184kJkg1) divided by the solar energy input, reached 30%–35% for solar flux inputs of about 2000kWm2 and for quicklime production rates up to 4kgh1. The use of concentrated solar energy in place of fossil fuels as the source of process heat has the potential of reducing by 20% CO2 emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of the indirect heating multi-tube rotary kiln. (Source: PSI.)

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Figure 2

Scheme of the experimental setup: (1) heliostat; (2) parabolic dish; (3) feeder; (4) rotary kiln; (5) shutter. (Source: PSI.)

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Figure 3

Heat balance scheme

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Figure 4

Shutter geometry: opening angle α, lamella width W, and distance D between lamella

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Figure 5

Linear approximation of normalized solar power input

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Figure 6

Variation of shutter opening angle (left) and solar irradiance (right) during an experiment

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Figure 7

Mean solar power input integrated over values calculated at time intervals Δt

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Figure 8

Enthalpy diagram for the calcination reaction

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Figure 9

Simplified model for heat conduction through cylindrical reactor walls

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Figure 10

Reactor efficiency as a function of the CaO production rate for representative solar experiments performed at temperatures in the range of 1200–1400K. Error bars are included for the three experiments presented in Table 1.

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