A Combined Heat and Power (CHP) system fuelled with rice husk is analysed from the thermodynamic, exergetic and economic point of view. The system is based on a gasification process coupled with a rice drying system. The produced syngas is employed to power a Spark Ignition (SI) Internal Combustion Engine (ICE) working as an electric generator, while the jacket cooling water powers a bottoming Organic Rankine Cycle (ORC) to produce electricity for plant self-consumption. A parametric analysis is carried out to investigate thermodynamic performances by varying the gasifier Equivalent Ratio (ER): as the ER increases, the ICE produced power and combustion efficiency decrease, while the thermal efficiency increases. However, the system is always capable to produce power for self-consumption and the desiccant flow for drying. The characterization of the engine is then better assessed by means of a dedicated GT-Power engine model, optimized for syngas fuelling, revealing a power derating of the 30% with respect to the natural-gas feeding operation. Other main findings suggest that the global exergetic efficiency ranges between 10.6% and 8.5%, while the economic profitability, represented by the Simple Pay Back, Net Present Value and Profit Ratio, cannot be considered satisfactory due to the consistent investment cost.

Chang C.T., Costa M., La Villetta M., Macaluso A., Piazzullo D., Vanoli L. (2019). Thermo-economic analyses of a Taiwanese combined CHP system fuelled with syngas from rice husk gasification. ENERGY, 167, 766-780 [10.1016/j.energy.2018.11.012].

Thermo-economic analyses of a Taiwanese combined CHP system fuelled with syngas from rice husk gasification

La Villetta M.;
2019-01-01

Abstract

A Combined Heat and Power (CHP) system fuelled with rice husk is analysed from the thermodynamic, exergetic and economic point of view. The system is based on a gasification process coupled with a rice drying system. The produced syngas is employed to power a Spark Ignition (SI) Internal Combustion Engine (ICE) working as an electric generator, while the jacket cooling water powers a bottoming Organic Rankine Cycle (ORC) to produce electricity for plant self-consumption. A parametric analysis is carried out to investigate thermodynamic performances by varying the gasifier Equivalent Ratio (ER): as the ER increases, the ICE produced power and combustion efficiency decrease, while the thermal efficiency increases. However, the system is always capable to produce power for self-consumption and the desiccant flow for drying. The characterization of the engine is then better assessed by means of a dedicated GT-Power engine model, optimized for syngas fuelling, revealing a power derating of the 30% with respect to the natural-gas feeding operation. Other main findings suggest that the global exergetic efficiency ranges between 10.6% and 8.5%, while the economic profitability, represented by the Simple Pay Back, Net Present Value and Profit Ratio, cannot be considered satisfactory due to the consistent investment cost.
2019
Chang C.T., Costa M., La Villetta M., Macaluso A., Piazzullo D., Vanoli L. (2019). Thermo-economic analyses of a Taiwanese combined CHP system fuelled with syngas from rice husk gasification. ENERGY, 167, 766-780 [10.1016/j.energy.2018.11.012].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/608014
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