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Contenuto archiviato il 2022-12-27

COGENERATION WITH RECIPROCATING ENGINE IN PARTICLEBOARD INDUSTRY

Obiettivo

The project purpose is the combined heat and power production in the Particleboard Industry, as alternative to the existing scheme of purchasing the electricity from the public network and the heat production by wood waste and fuel burning.
A diesel type reciprocating engine driving an alternator produces all the base and peak power required by the factory.
The exhaust gases from the engine are used in the process dryers. In order to increase the gases temperature, a post-combustion wood dust burner is installed in the outlet of the engine. So the fuel-oil for drying purposes is reduced.
The cogeneration with engine and the post-combustion burner using process dust are innovatory in the Particleboard Industry.
The rated electrical power output is 5460 kW, being 5260 kW available. During the first year the equipment availability was 88% on hourly average output of 5029 kW, 1100 Tons of wood dust were burned and there together with the exhaust gases, translated in fuel oil saving of 2000 Tons.
In Portugal there is a high usage of fuel oil for generation of electricity for the grid. The ratio is in fact 300 g fuel per kWh. With this cogeneration project the actual consumption of heavy fuel oil per kW is lower than the national ratio. When taking the additional efficiency of cogeneration into account there is a notional saving of 4,484 tonne of heavy fuel oil for 38,086 MWh electricity generated in the first year of operation. The projected figure for annual fuel saving is 5,890 tonne of fuel oil. With normal sulphur content of such oil in Portugal being 3.5%, this saving translates into a large reduction in SO2 emission.
The plant comprehends basically a diesel engine with its auxiliaries, on AC alternator and a wood dust combustion chamber. Storage and handling system for different fuels and lubricants are also included.
The diesel engine drives the alternator producing electric energy. The generator can work in island or in parallel with the public network. In The first case the generator will alone supply all the needed electric energy to the factory and in the second case it's possible to choose the power output, being the exceeding energy sold or the missing energy bought from the public network.
Usually the engine consumes heavy oil that as been previously separated, purified and heated in the auxiliaries. The start and stop the engine light fuel oil is also used in order to clean the fuel injection system. The engine is microprocessor controlled and, when running alone, will automatically adjust the output voltage and frequency. When connected in parallel with the network, it will output the active and reactive power according to adjustable setpoint values.
An insulated pipe transports the exhaust gases to the combustion chamber, where their temperature is increased with wood dust burning, or directly to the dryers. The air temperature adjustment to the dryers needs is done by modulating the quantity of wood dust to be burned. If the temperature in the dryer is too high or if to the exhaust counterpressure becomes to high, a safety mechanism will allow the gases to exhaust throw the traditional engine exhaust system, protecting both the engine and the dryer. The equipment and the plant are designed for safe, reliable and efficient working in continuous operation, as base load, over 24h/day and 326 days/year.

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Meccanismo di finanziamento

DEM - Demonstration contracts

Coordinatore

SOC. DE MADEIRAS INDUS. E TRANSFORMADAS (SOMIT)
Contributo UE
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Indirizzo
S. PAIO DE GRAMACOS APART. 73
3400 OLIVEIRA DO HOSPITAL
Portogallo

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