Title: Numerical modelling of effects of hydrogen supply on combustion behaviours of low calorific value coal gases

Authors: Mustafa Ilbas; Serhat Karyeyen

Addresses: Technology Faculty, Department of Energy Systems Engineering, Gazi University, 06500 Teknikokullar, Ankara, Turkey ' Technology Faculty, Department of Energy Systems Engineering, Gazi University, 06500 Teknikokullar, Ankara, Turkey

Abstract: In this study, the effect of the hydrogen supply on combustion performances and emission levels of low calorific value coal gases has been numerically investigated in a model combustor. The numerical modelling of turbulent diffusion flames has been performed by using a CFD code. k-ε model of turbulent flow, the PDF/mixture fraction model of diffusion flame and P-1 radiation model were used in the present study. The flames of coal gases for pure and hydrogen supply cases were modelled to predict its combustion behaviours. There are five cases of testing, i.e., pure generator gas or pure blast-furnace gas and fuels supplied 4%, 5%, 10% and 15% hydrogen by mass. According to the predictions, the combustion performances of generator and blast furnace gases were improved by supplying hydrogen progressively. Similarly, NO_x formations of generator and blast furnace gases were increased due to increment of its flame temperatures depending on hydrogen amounts.

Keywords: coal gases; global warming; emissions levels; numerical simulation; turbulence modelling; hydrogen supply; combustion behaviour; low calorific gases; turbulent diffusion flames; CFD; computational fluid dynamics; k-epsilon model; turbulent flow; NOx; nitrogen oxides; generator gases; blast furnace gases; flame temperature.

DOI: 10.1504/IJGW.2016.077898

International Journal of Global Warming, 2016 Vol.10 No.1/2/3, pp.16 - 31

Received: 29 Jul 2014
Accepted: 22 Oct 2014
Published online: 22 Jul 2016 *

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