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Feasibility Study of an IGCC Coal-fed with CCS Demo Plant for Flexible Hydrogen-Electricity Co-production

pubblicazioni - Articolo

Feasibility Study of an IGCC Coal-fed with CCS Demo Plant for Flexible Hydrogen-Electricity Co-production

for Flexible Hydrogen-Electricity Co-production Vincenzo Fantini* Seventh annual conference on carbon Capture & Sequestration Piittsburg, Pennsylvania (USA), 5-8 Maggio 2008 PRESENTAZIONE POWER POINT * CESI RICERCA A feasibility study of an IGCC+CCS, “first of a kind” in Italy, producing in a flexible way electric energy and hydrogen is presented. The 70 MWe plant is able to rapidly switch from only electric to electricityhydrogen co-production according to a kWh price threshold, below which electricity production is less economically profitable compared to hydrogen production. The facility is assumed to be located in southern Sardinia and is fed by a low rank bituminous coal from Sulcis basin, where unminable seams can be exploited for the geological storage of the captured CO2. The plant units is realised by only proven and commercial ready technologies, in order to favour the plant reliability in operation and to reduce its construction time, rather than to maximise the overall efficiency. Plant power island is made by two identical groups, each consisting of a 25 MW GT followed by its HRGS, and by a common steam turbine. Steady-state plant process has been modelled by ThemoflexTM code in the following operating configurations: – only electric production (two GT at 100% load) – electricity-hydrogen co-production (one GT off, one GT on at 50% load). The price threshold for switching from pure electrical to electricity- hydrogen production has been determined from kWh Italian market prices. Due to CCS, benefits from CO2 avoided emission credits are also taken into account. Investment analysis shows that a partial public funding support is required, based on incentives of CO2 emission credits or on a partial support of the capital cost.

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