This paper presents the results of a techno-economic feasibility assessment of small scale (100 kWe) CHP generation plants fired by natural gas and biomass. The focus is on externally fired gas turbine (EFGT) cycle. In this cycle, compressed air is heated in the high temperature heat exchanger (HTHE) by using the hot gases produced by the natural gas/biomass combustion process. The hot air expands in the turbine and then feeds the furnace. In order to explore the influence of fuel characteristics on (i) technical plant parameters, (ii) conversion efficiencies, (iii) investment and operational costs, (iv) primary energy saving balances and (v) profitability of investments, four main scenarios are proposed. The scenarios are (a) internally fired gas turbine by natural gas (baseline scenario), (b and c) cofiring of biomass and natural gas (ratio 50-50% and 70-30% on energy content respectively), (d) EFGT cycle only fired by biomass. Technical performances and profitability on the proposed CHP systems are evaluated, in view of the incentives available in Italy for biomass electricity and for high efficiency cogeneration (HEC) systems. Moreover, the primary energy savings and the public subsidies available for each scenario are calculated and compared, in order to evaluate the configurations with minimum public cost for primary energy saved.

NATURAL GAS VS BIOMASS VS DUAL FUEL MICRO GAS TURBINE FOR CHP GENERATION IN THE ITALIAN SCENARIO

PANTALEO, ANTONIO;
2013

Abstract

This paper presents the results of a techno-economic feasibility assessment of small scale (100 kWe) CHP generation plants fired by natural gas and biomass. The focus is on externally fired gas turbine (EFGT) cycle. In this cycle, compressed air is heated in the high temperature heat exchanger (HTHE) by using the hot gases produced by the natural gas/biomass combustion process. The hot air expands in the turbine and then feeds the furnace. In order to explore the influence of fuel characteristics on (i) technical plant parameters, (ii) conversion efficiencies, (iii) investment and operational costs, (iv) primary energy saving balances and (v) profitability of investments, four main scenarios are proposed. The scenarios are (a) internally fired gas turbine by natural gas (baseline scenario), (b and c) cofiring of biomass and natural gas (ratio 50-50% and 70-30% on energy content respectively), (d) EFGT cycle only fired by biomass. Technical performances and profitability on the proposed CHP systems are evaluated, in view of the incentives available in Italy for biomass electricity and for high efficiency cogeneration (HEC) systems. Moreover, the primary energy savings and the public subsidies available for each scenario are calculated and compared, in order to evaluate the configurations with minimum public cost for primary energy saved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/63570
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