Objective
The project goal is the installation of a thermo-electric 175 MWe power unit in Andorra (Teruel). The unit shall include an atmospheric fluid circulating bed boiler and will use a mixture of local and coal coming from a pre-washing plant to be installed prior the existing washing plant; both fuels with a high ash and sulphur contents, SO2 emissions can be reduced by 90% (designed for up to 95%) and set those NOx at 250 mg/m3N using this technology.
As the main mid-term goal, we intend to replace with this technology the boilers presently used in the 350 MWe units at Teruel.
The 175 MWe unit will be made of a mono-bloc group of boiler-turbo-alternator transformer. Added as a basic to those equipments, are a coal preparation and transport system and a natural draught refrigeration tower designed for a 18000 m3/h flow.
- The boiler will be of the ATMOSPHERIC FLUIDIZED CIRCULATING BED type, subcritical, with natural circulation, balance draught and prepared for outdoor operation including as components a Coal, Limestone feed system, a Fluid Bed Combustor with water walls in the upper part of the combustor, four recirculation cyclones with a special closing system to recirculate solid matter, two fluid bed heat exchangers, two ash coolers, two ash-control valves between the fluid bed heat exchanger outlets and the two ash coolers, an electrostatic precipitator with solid particle emission below 50 mg/m3N, an induced draught fan and a vapor generator including economizer, intermediate reheater, over heater and evaporator walls.
- The turbine to be installed will have two bodies and direct flow, with intermediate vapor re-heating in the boiler including one surface type condenser, three low pressure heaters, one degasifier heater, and two high pressure heaters. With those elements, the forecast vapor conditions (140 bar/540 deg. C at the inlet) and the vacuum adapted to the scheduled refrigerating system (0,085 bar), the thermodynamic cycle has a specific consumption of 1936 kcal/kWh .
- The Alternator is of two poles type, 3000 r.p.m. and static excitation. The generated voltage will be 18 kv. The three-phases power transformer, with a 18/400 kV ratio, will provide energy to the network through its own unit swith, located between the generator and the transformer. This, the power transformer can also be used as a starting transformer with the equivalent for auxiliary services, with an 1816 kV ratio.
This plant will operate burning a mix of local normal coal and wash coal with high lever ash and sulphur contents (31% and 6%) and very low calorific power (3053 kcal/kg). Besides, it needs a 60 t/h limestone comsumption for reducing SO2 levels emmission. The auxiliar electrical consumption is forecasten about 9% so the Net Power of the plant will be 159.250 kW given these rates a Net Specific Consumption of 2622.6 kcal/kWh.
The auxiliars consumption and the larger invest needed makes this technology overcost to the price of each kWh produced in a conventional same size thermal plant.
However it benefits of the low SO2 and NOx emission levels and the possibility of burning coal-types that cannot be burned in the conventional existing plants.
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Coordinator
28002 Madrid
Spain
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