Dual-fuel combustion in a tangential PC-fired boiler of type OP-230 – computational simulations

¹ Kazimierz Pulaski University of Technology and Humanities in Radom, Faculty of Mechanical Engineering, Malczewskiego 29, 26-600 Radom, Poland
² Bialystok University of Technology, Faculty of Engineering Management, Ojca Tarasiuka 2, 16-001 Kleosin, Poland

^* Corresponding author: p.motyl@gmail.com

Abstract

Syngas co-firing in coal fired boilers can be one of the prospective technologies which may help to retrofit some of still functioning older boilers. This study focuses on the results of CFD simulations of wood biomass-derived syngas co-firing with coal in an older mid-sized tangential PC-fired boiler of type OP-230. The design and the implementation of the combustion process predispose the boiler to the connection with the biomass gasifier in which low calorific syngas from solid raw biomass gasification can be produced and next used as a supplemental fuel in the coal furnace. The simulations were performed to predict the influence of the improvement of the air staging via the dual-fuel technique based on the indirect co-firing technology on both the reductions in NO_x emissions relative to the baseline (no syngas) and the residence time of syngas particles in a zone with the temperature higher than 1123K. This way one can determine whether the boiler can be recommended to indirect co-firing of syngas derived from agricultural residues biomass or SRF gasification containing such troublesome components as chlorine and alkali.