Exergetic Modeling of Oil Shale-fired Circulating Fluidized Bed Systems
Makaleler > Tam Makale · 2009
Yazarlar: A. Hepbasli
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, Uluslararası, 2009, cilt 31, ss 325-337
DOI: 10.1080/15567030801901182
Özet
In the recent years, exergy analysis has been widely used by many investigators in the design, simulation and performance evaluation of thermal systems. However, the studies conducted on exergetic assessment of oil shale-fired fluidized bed systems are very limited, although those on the design, operation and energetic evaluation of these systems are much in numbers. Oil shale has been successfully burnt in many circulating fluidized beds due to their values for the satisfactory desulphurization and combustion efficiency, low NOx emission as well as the adaptability to low-grade coal, appropriate capital and operation costs. In this study, the relations related to the exergetic evaluation of the oil shale-fired fluidized bed systems are given for modeling purposes first. Next, this model is applied to a highly efficient oil shale circulating fluidized bed system having a boiler with a steam mass flow rate of 65 t/h designed for Huadian thermal power plant in China using the actual operational data given in the literature. The exergy efficiencies of the system are then determined to assess its performance and to elucidate potentials for improvement. Finally, the results obtained are discussed, while some recommendations are made.