Integration of a pilot-scale serpentinite carbonation process with an industrial lime kiln

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Martin Slotte, Inês Romão, Ron Zevenhoven
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication year: 2013
Journal: Energy
Journal acronym: ENERGY
Volume number: 62
Start page: 142
End page: 149
Number of pages: 8
ISSN: 0360-5442
eISSN: 1873-6785


Abstract

This paper involves integration of a mineral carbonation process developed at Abo Akademi University with an industrial lime kiln. Optimization of energy integration and flue gas compression is studied by means of exergy analysis. In addition technical challenges of process scale-up from laboratory to pilot scale are discussed. Aspen Plus was used to model the process. The intended pilot scale is to process 620 kg/h lime kiln gas which is almost two orders of magnitude more than processed at laboratory scale. Process integration brings significant improvements to energy economy compared to earlier studies as here also a flue gas compression strategy is addressed and CO2 pre-separation is avoided. The utilization of 500 degrees C waste heat from the lime kiln leads to exergy demand per ton CO2 sequestered for heat and power of 2595 MJ and 885 MJ, respectively, processing 550 kg rock/h and sequestering 187 kg CO2/h. With the heat and power requirement equivalent to a production of 9 kg CO2/h, this gives a net sequestration of 178 kg CO2/h. The calculations were made for serpentinite rock from a nickel mine in Hitura, Finland, assuming a 90% conversion of Mg from rock to Mg(OH)(2) and a 90% carbonation conversion of this.


Keywords

Carbonation, CO2 sequestration, Exergy, Process scale-up, Serpentinite

Last updated on 2020-22-01 at 02:49