Title: Prediction of calcination and sulphation along the sorbent particle trajectories for desulphurisation in coal-fired furnace

Authors: Ivan Tomanović; Srdjan Belošević; Nenad Crnomarković; Aleksandar Milićević; Dragan Tucaković

Addresses: Department of Thermal Engineering and Energy, 'VINČA' Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Vinča, P.O. Box 522, 11001 Belgrade, Serbia ' Department of Thermal Engineering and Energy, 'VINČA' Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Vinča, P.O. Box 522, 11001 Belgrade, Serbia ' Department of Thermal Engineering and Energy, 'VINČA' Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Vinča, P.O. Box 522, 11001 Belgrade, Serbia ' Department of Thermal Engineering and Energy, 'VINČA' Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade, Mike Petrovića Alasa 12-14, 11351 Vinča, P.O. Box 522, 11001 Belgrade, Serbia ' Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade 35, Serbia

Abstract: The furnace sorbent injection is analysed numerically, focusing on its behaviour, in order to estimate CaCO₃ sorbent utilisation. Comprehensive presentation of numerical results and profound analysis are provided to better understand the process under realistic conditions. The boiler load reduction, varied between 70 and 100%, did not disturb the processes in furnace. Insight into individual trajectories and their overall sulphation reveal that reduced load, in these cases, yield somewhat better SO₂ reduction. Reactivity of the sorbent particles was better with the boiler load reduction, especially for particles passing near the flame core. The calcination and sulphation of sorbent particles increase with the boiler load decrease, due to the combined influence of extended particle residence time and more favourable reaction conditions. Thus the boiler load reduction can lead to better particle utilisation and higher SO₂ capture. The conclusions are limited to the case-study conditions and impose the need for further investigation.

Keywords: furnace; sorbent injection; limestone; calcination; sulphation; lignite; pulverised coal combustion; particle trajectories; CFD; simulation; sorbent particles.

DOI: 10.1504/IJGW.2020.111520

International Journal of Global Warming, 2020 Vol.22 No.4, pp.459 - 482

Received: 06 Jan 2020
Accepted: 09 Jun 2020
Published online: 30 Nov 2020 *

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