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A reburning process using sewage sludge-derived syngas

Sebastian Werle

Institute of Thermal Technology, The Silesian University of Technology at Gliwice, 22 Konarskiego, 44100 Gliwice, Poland

 

E-mail: Sebastian.Werle@Polsl.pl

Abstract: The motivation for this work was to define the reburning potential of sewage sludge (SS) gasification gas (syngas). A numerical simulation of the co-combustion process of syngas in a hard coal-fired boiler was made. All calculations were performed using the Chemkin program and a plug-flow reactor model was used. The calculations were modelled using the GRI-Mech 3.0 mechanism. The highest conversions for nitric oxide (NO) were obtained at temperatures of approximately 1000 K to 1200 K. The highest reduction efficiency was achieved when the molar flow-ratio of the syngas was 15 %. The combustion of hard coal with sewage sludge-derived syngas reduces NO emissions and the amount of coal needed to produce electricity and heat. Furthermore, advanced reburning, a more complex process, achieved an efficiency of up to 80 %. Calculations show that the syngas thus analysed can provide better results.

Keywords: reburning – plug-flow reactor – syngas

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-011-0098-y

 

Chemical Papers 66 (2) 99–107 (2012)

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