Abstract
These days, gasification of waste is attaining a lot of interest in Korea, since this country recycles 60% of its waste and thereby there is still a significant portion of the waste entering the landfill sector. Therefore, such wastes can be directed from landfilling to a form of renewable energy through viable technology such as waste gasification process. As part of this kind of research efforts, this study deals with the combustion characteristics of the waste gas of low heating values obtained by gasification. To this end, a series of numerical calculation has been made for physical resolution of the burning mechanism of waste gas blended with LNG in an industrial LNG combustor. Special attention is given on the effect of increased mass flow rate on the flame stability of the flame together with the overall burning performance, since the waste gasified fuel is typically characterized by the large mass flow rate due to low heating value. Numerical calculation has been made using phenomenological modeling in turbulent reacting flow using STAR-CD code. Systematic investigation has been made with the parameters of the mixture ratio and swirl intensity in order to see the overall combustion performance together with the flame stability. In general, parametric study appears consistent and physically acceptable. Especially the 70% of waste gas and 30% of LNG in the mixture seemed quite desirable in the aspect of the stable flame formation. Further, in order to obtain stable formation of the flame by the blended fuels, the proper determination of the design and operational condition is quite desirable using numerical modeling.
