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| | Bubbling Fluidized Bed Boiler
"EcoFluid" bubbling fluidized bed boilers represent the adaptable heart of AE&E "Green Power" plants. "EcoFluid" constitutes the ideal firing technology for biomass and other biogenous residues and wastes.Problem-free fulfillment of all emission stipulations
Targeted firing management in the combustion chamber enables adherence to EC/2001/76 (850°C for two seconds)
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| Design | | Bubbling Fluidized Bed Boiler
| | Output | | 5 - 250 tphr
| | Fuels | | Agricultural waste
Biomass
Pulp and paper residues
RDF
Sewage sludge
Waste coal
Waste wood
Other fossil fuels
| | References | | Over 30 plants, e.g. Stendal, Germany (103 tphr)
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| AE&E DEVELOPMENT WORK
For AE&E, ongoing further development by means of intensive research work is an absolute priority. The aim of activities in the R&D sector is the consolidation and improvement of competitiveness. During the continuous product optimisation process, AE&E cooperates closely with customers, suppliers and universities.
Integrated design
- A combustion chamber frame formed by the membrane boiler walls
- The combustion chamber, consisting of the bed area, a free zone and after-burning chamber, is integrated into the pressure section of the boiler
- The membrane walls of the bed and the free zone are lined with erosion-resistant refractories
- Thin refractories permit rapid boiler start-up and shut-downs
- No danger of flue gas condensation on the gas-tight membrane wall, as the wall is kept at the temperature of saturated steam
- Fuel feeding using an air feeder in the underpressure zone above the bed
Open nozzle floor
Design features
- Hypostoichiometric incineration in the bed area, which permits precise temperature control
- Continuous removal of unbumed coarse material during plant operation
- Integrated cooling of the removed bed material
- Separation into fine and coarse fractions
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| - Optimized binding of pollutants in the ash (S. CL)
- Low levels of excess air
- High boiler efficiency
- Outstanding fuel flexibility
- Minimum lower calorific value of approx. 3 MJ/kg
- Precise temperature regulation of the combustion air
- Open nozzle grid for the removal of coarse particles during plant operations with minimum disruptions
- No risk of flue gas condensation on the gas-tight membrane walls
- High availability levels
- "Utilization instead of disposal" In view of waste dumping regulations, this principle is to be seen as a challenge involving the harmonisation of ecological compatibility with economic requirements.
- The use of industrial and municipal sludge with very low calorific values (down to Hu = 3 MJ/kg) as a fuel, helps operators to achieve economic, long-term plant operation.
- Plants for the thermal utilization of biomass, e.g. wood and wood wastes, as a renewable fuel in accordance with the local green power- funding programmes.
- Complete solutions and "EcoFluid" - BFB Boilers as part systems in the capacity range of up 60 MWel, 200 MWth, and/or steam output of up to 250 t/h.
- EcoFluid fluidized bed technology with its high fuel flexibility enables the use of fuels with heating values of 3 - 20 MJ/kg.
Poultry Litter Incineration Plants - Residues from agriculture and the keeping of livestock are available as fuel in sufficient amounts within the economic cycle.
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| Stationary fluidized bed - an ideal combustion system.Combustion air, injected from numerous nozzles, fluidizes a bed of quartz sand into a homo-geneous, swirling medium. The fluidized sand bed presents a very large combustion surface at a uniform temperature, exposing the waste to ideal combustion conditions. With its simple design, the system is highly resistant to upset conditions and requires little maintenance. Oil, gas, wood chips, or recycled materials can be added if the heat value of the waste is too low or if its moisture content is too high. In the combustion chamber's upper portion, the flue gas is completely burnt out at more than 1560°F(850°C).
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| In order to ensure economic operation throughout the entire life of a plant, operators are turning increasingly to concepts offering high levels of flexibility.
"EcoFluid" and "PowerFluid" boilers offer optimum coverage in this regard.Advantages of fuel flexibility
An ever-increasing number of companies are opting for the economic use of traditional and new biomass. AE&E solutions are ideal for the optimum harmonisation of firing technology to the specific fuel available, as well as for the use of fuels with a calorific range of 3 - 20 MJ/kg (720 - 4800 kcal/kg). Wood and Wood Waste
- Wood
- Chippings
- Bark
- Sawmill shavings
- Quick growing energy plants
Agricultural Waste - Liquid manure
- Poultry litter
- Bagasse
- Rice husks
- Olive residues
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| VERA, GermanyBubbling fluidised bed boiler for the incineration of sewage sludge.
Steam output : 3 x 9 t/h
Steam pressure : 40 bar
Steam temperature : 400°C
Calorific value : 3.2 - 5.3 MJ/kg RENI, Switzerland Bubbling fluidised bed boiler (Turbo) for the incineration of rejects, wood waste, paper and sewage sludge.
Steam output : 18 t/h
Steam pressure : 15 bar
Steam temperature : 230°C
Calorific value : 5 - 7 MJ/kg TIMELKAM, Austria
57 t/h bubbling fluidised bed boiler for the incineration of bark, waste wood, saw mill residue and wood dust. M-REAL HALLEIN, Austria
39 t/h bubbling fluidised bed boiler for the incineration of rejects, bark, sludge and wood wastes. SICET, Italy
17.5 MWel biomass-fired power station for the utilisation of wood wastes and bark. WESTFIELD, Great Britain
11.8 MWel biomass-fired power station for the utilisation of poultry litter, steam output 47 t/h.
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