USE OF FOREST AND AGRICULTURAL BIOMASS TO FEED A POWER STATION LOCATED IN AN AGRICULTURAL COOPERATIVE

Ziel

To demonstrate the possibility to substitute mineral oil by charcoal and oil obtained from biomass pyrolysis, for feeding an existing 27 MW power station. The project foresean the replacement of two burners of one of the two boilers.
The project involved the modification of one of the two boilers installed in the power station. To achieve this aim, the eight burners of the boiler had to be replaced with burners specifically designed for the new fuels and the relevant receiving, storage, handling and control systems had to be built ex novo. Moreover, the compatibility of the whole system of the boiler and of the ancillary equipment had to be checked for compatibility with the new fuels.
The basic design of the project, including the study of the new burners, the relevant modifications to the system and the alternative process choices, had been studied under a separate project financed by the DG XII. In this project, also a feasibility study on the complete revamping of the power station was carried out with positive results.
Moreover, the experimental work carried out on the products indicated a very interesting option which was not available at the time the project had been allocated, i. e. the charcoal-waterslurry (CWS) at water contents similar to those for the mineral coal.
For all these reasons, it was decided to include in the project the installation of one burner based on charcoal-water slurry. Consequently the program was carried based on the replacement of two of the eight burners of one of boilers with other ones suitable for all the pyrolytic fuels and on the installation of all the equipment necessary to receive, store and feed the fuels and to monitor the demonstration program.
The pyrolytic fuels selected were bio-oil, pulverized charcoal and CWS eventually combined with fuel gas and fuel oil.
While the program was being carried out the owner of the plant experienced financial difficulties which led to the block of its activities, including its participation to the project.
At this moment the program has been carried out up to the stage of placing the purchase order for all the equipment and their installation. All the activities have been consequently frozen cancellingthe orders which have been possible to cancel and no further work has been carried out.
At the time the work has been stopped, the engineering work had been completed for most of the items. The construction had been completed only for the mixer of CWS tank, its motor and the relevant support structure. For the other items, it was at a stage were it could just be stopped or the material already purchased diverted to other utilizations.
The existing plant is made up of two boilers (13,5 MW each) each fitted out with eight burners. The project foresean the substitution of two burner of one boiler. The first burner should use charcoal water slurry (CWS). This burner has been designed for a capacity of 2 000 000 Kcal/h.
The second burner should use both bio-oil and pulverized charcoal.
This solution would allow switching from one fuel to the other without changing the burner with all its connections.
The capacity of the burner is 2 000 000 Kcal/h.
When in pulverized charcoal mode, the burner is fed with a mixture of air and charcoal which is largely substoichiometric to prevent explosions.
The relevant air acts as primary air. The relevant ratio is 2 kg of air/kg of coal.
Secondary air is fed in a concentrical annulus together with the air-charcoal mixture. The relevant global ratio is 9 kg of air/kg of coal.
Tertiary air is fed in another concentrical annulus where the guns for natural gas are also located. Naturalgas will be used only for start-up. When in bio-oil mode, the fuel is injected by means of an oil gun, using low pressure steam (6 Bar g) as atomizing medium. Total consumption of the plant is 82,300 t/year of charcoal and bio-oil substituing 60,000 t/year of mineral oil.

Programm/Programme

ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985

Thema/Themen

1.2 - GAS AND CHARCOAL FROM GASIFICATION AND PYROLYSIS

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

DEM - Demonstration contracts

Koordinator

Consorzio delle Cooperative della Marsica Scarl

EU-Beitrag

Keine Daten

Adresse

Via Nuova 46
67051 Avezzano L'Aquila
Italien

Gesamtkosten