Converting Waste Agricultural Biomass into a Resource - UNEP

Parameters for Procurement Specifications
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Turbomach earned the contract for the engineering, procurement and
construction (EPC) of the biomass-fired power plant in Lucena, Córdoba. The
plant is based on a 14.3 MWe gas turbine generator package, an olive oil
residue incinerator and heat recovery system, and a 14.8 MWe steam turbine
generator package. Turbomach has been acting as the main contractor and
O&M contractor for the plant. The gas turbine and steam turbine generator
packages are products from Turbomach.
Operation and Maintenance
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As discussed, the heat requirement for the drying process, on the basis of
operating more than 8200 hours/year, permitted the installation of a 14.3
MWe gas turbine generator package based on the Solar Titan 130 industrial
gas turbine which generates more than 100,000 MWhth/year. The exhaust
gases are supplied directly and in parallel to two tram-mel-type dryers. Gases
exit the gas turbine generator at 45 kg/s at about 495°C. About 10% of the
exhaust gases from the gas turbine is conducted to the biomass boiler to
increase the plant efficiency by pre-heating the boiler’s combustion air, which
will be regulated to minimize the formation of NOx and CO.
The fuel efficiency of the cogeneration plant is close to 90%, whereas the
electrical efficiency is 34%. Approximately 1.5 MWe is used for the plant’s
own consumption. The gas turbine is fed with LNG stored at the site. In the
future the plant will connect to the gas pipeline at the town of Lucena in
Córdoba.
Out of the approximately 92,600 tonnes/year of orujillo with 10% - 12%
moisture and around 4000 kcal/kg of heating value, around 77,000 tonnes are
burnt per year in the biomass plant. The rest will be provided as fuel to the
Hermanos Santamaría plant.
Orujillo is combusted in the biomass boiler that produces steam at
highpressure and temperature. The biomass boiler will produce superheated
steam at about 65 bars and 450°C, at about 55 tonnes/hour. The boiler has a
high heat output so that the efficiency of the biomass plant surpasses 30%.
The flue gas from the boiler is filtered to prevent the emission of particles into
the atmosphere.
The steam produced is expanded up to 0.08 bar in a Turbomach-TV2 steam
turbine generator package. The steam turbine is a MARC4C01 system
manufactured by B+V Industrietechnik. It is equipped with an intermediate
bleed to feed the thermal de-aerator. The steam turbine generator package
has a capacity of about 14.8 MWe, with the export of some 104,000
MWh/year of electrical energy.
The electrical power generated by the plant at 11 kV will be connected to the
Sevillana-Endesa grid at 66 kV via a step-up transformer station. The plant is
furthermore provided with its own utilities for compressed air and low-voltage
power (400 V). Both the gas turbine generator package and the steam turbine
generator package are installed outdoor with their own individual
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