Various fuels can be used in circulating fluidized bed (CFB) boilers. In this study, the thermal and economic performance was investigated for three CFB fuels—heavy fuel oil, coal, and waste tire scraps—used in a cogeneration plant. The plant comprised a CFB boiler, a single-cylinder steam-extraction turbine, and a generator. Tire scrap combustion generated the most power per ton during peak hours: approximately 27.5% more than that generated using heavy oil and 42.3% more than when coal was employed; it also resulted in higher boiler efficiency during peak operation than coal (1.2% higher) or heavy oil (12.6% higher). The net plant efficiency during peak hours was highest for coal (25.09%), followed by tire scraps (23.82%) and heavy oil (18.11%). On the basis of international spot fuel prices, tire scraps were determined to have the lowest cost per kilowatt-hour generated, followed by coal and heavy oil. Using waste tire scraps as fuel can not only reduce pollution but also help hedge against international crises, which can affect energy imports.
Yeh, Chin-Ko and Yeh, Rong-Hua
"Combustion of scrap waste tires of a cogeneration plant,"
Journal of Marine Science and Technology: Vol. 31:
1, Article 1.
Available at: https://jmstt.ntou.edu.tw/journal/vol31/iss1/1