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Modelling of a Biomass-Integrated-Gasifier/Combined-Cycle (BIG/CC)system with the flowsheet simulation programme ASPENplus: studyperformed within the framework of the extended JOULE-IIprogramme of EC DGXII contract JOU2-CT93-0397 "Energy frombiomass: an assessment of two promising systems for energyproduction"
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ECN 1995
ECN publicatienummer: Publicatie type:
ECN-C--95-041 ECN rapport
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An ASPEN"p"l"u"s model of the title system has been set up, for the gasification of organic waste streams and residues, to produce electricity. After evaluation of some main system components, concerning the drying of the 'wet' fuels and the clean-up of the produced fuel gas, a BIG/CC system has been defined for further consideration. The modelled system consists of flue gas drying of the 'wet' biomass fuels in a rotary drum dryer, gasification of the 'dry' biomass fuels in an atmospheric circulating fluidized bed gasifier, fuel gas clean-up in a 'wet' conventional low-temperature clean-up unit, compression of the fuel gas to gas turbine specifications, combustion of the fuel gas in a gas turbine and electricity production with an expander coupled generator, steam production and superheating in a HRSG cooling the flue gas produced by the gas turbine, and additional electricity production in the steam/water cycle by a generator coupled to a partly condensing steam turbine. The model of this BIG/CC system has been applied to evaluate the influence of the kind of organic (waste) materials to be gasified on the overall net system efficiency. It has been checked whether the fuel gases produced, when gasifying a variety of organic materials, comply with the gas turbine and HRSG hardware constraints, and if the flue gases emitted to the atmosphere meet the Dutch emission constraints. The organic materials that were taken into account are: poplar wood, verge grass, 'GFT' (green, fruit and garden wastes), demolition wood, and a mixture of sludge and demolition wood (20/80 weight% m.a.f.). The net overall energetic system efficiencies, for the different organic materials are varying on a lower heating value basis between 34.3 and 39.1 %, and between 27.1 and 35.0 % on a higher heating value basis. The hardware constraints can easily be met, whereas the Dutch emission constraints can be met after making some small modifications to the fuel gas clean-up system. 8 figs., 18 tab., 6 appendices, 35 refs.

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