Objective
To supply a 24.65 Mw power station at Beaufonds, with excess bagasse (the traditional fuel for raising steam and generating electricity for sugar making) achieved as a result of advances in sugar cane processing technology. The power station provides the "Electricite de France" local grid with additional electricity required to meet the needs of Reunion island during the sugar refining season, a period when water for the generation of hydroelectricity is scarce.
The Beaufonds bagasse-fired power station was provisionally handed over on
27.08.83 when the sugar season, during which it supplied 10 million Kwh to island's electricity grid, had been in progress for two months.
The 1984 sugar season was selected as the demonstration period for the project. The power station, despite irregularities in sugar works operation, attained maximum continuous performance in terms of reliability and output - 28 million Kwh of which 10 million Kwh was used by the sugar works. Cost per generated unit, including depreciation and financing charges, was 87.5% of the cost of fuel alone with a conventional design in which 225 grammes of fuel oil is required to generate one Kwh. Despite failure to meet targets and the need for additional investment to limit sugar processing-related energy use, the project is judged successful and expected to yield a saving of 8,000 TOE/y with payback estimated at +/- 4 years.
The project has also demonstrated that the additionalresource of sugar cane biomass is not inconsiderable and can be included in the regional or national energy balance of a country with an energy shortfall.
Sugar cane is Reunion's major resource with +/- 2,500,000 tonnes of sugar being processed annually providing 250,000 tonnes of raw sugar for export. Bagasse, the fibrous waste left after extraction of the juice accounts for +/- 30% by weight of sugar cane, is an excellent fuel of 1,850 Kcal/Kg. The five sugar refineries on Reunion burn 700,000 tonnes of bagasse annually or 140,000 TOE.
The minimum requirements for the power station's success was the energy saving processing of sugar cane (250 T/h. during the season) yielding a specific steam consumption of 350 Kg/t throughput in comparison with 500 Kg/t in conventional sugar cane refineries. This energy consumption level is the only way of providing surplus bagasse required to run the power station.
The supply contract for plant components was placed in 1981 with a consortium of three French manufacturers and the following major items of equipment specified :
* Fives-Cail Babcock 130 T/h high thermal efficiency bagasse firedboiler (output 130 T/h at 55 Bar, 440 C) with large mixed recuperative heaters. Of modern design the boilers combustion chamber is made up of tubes forming a gas-tight shell. It has the following characteristics :
- mechanical stoker with rocking bar grate;
- mechanical de-duster to limit dust quantities carried into the stack;
- full-range governing equipment : this automatically
adjusts boiler operation to steam demands (efficiency is 87% in comparison with 78% for conventional bagasse-fired boilers). The boiler, with modification, can burn other fuels (coal in particular).It is also able to use some excess bagasse from other sugar mills. If this was compressed, transport and storage facilities provided, this would also permit operation (in preference to coal) between seasons.
- full range governing equipment : this automatically adjusts boiler operation to steam demands (efficiency is 87% in comparison with 78% for conventional bagasse-fired boilers).
* Creusot-Loire condensing, steam bleed turbine and reducing gear unit providing :
- 66.3 T/h of bleed steam at 2.5 Bar for process use;
- 60 T/h of exhaust steam at 0.09 ATA for the condenser.
* Jeumont Schneider alternator and associated electrical equipment, of 30,800 Kva, supplying 24,600 Kw of which 4,800 Kw is to the sugar works and boiler house and 20,000 Kw to the island's electricity grid.
Societe Francaise Fives-Cail Babcock provided conceptual design and project management.
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Coordinator
97441 SAINTE SUZANNE (LA REUNION)
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.