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Contenuto archiviato il 2022-12-27

ELECTRICITY GENERATION USING POULTRY LITTER AS FUEL

Obiettivo

To establish and demonstrate the viability of a small private utility burning a novel fuel, poultry litter, in a modified solid fuel boiler for the supply of electricity to local consumers.
Expected Energy Saving 35,000 TOE/yr
Expected Simple Payback 4.4 years.
The rated net output of the constructed plant is 12.65 MW at 33 kV and this is exported into the local electricity network. Poultry litter fuel is collected from about 120 farms and a radius of about 40 miles. Implementation of the project was achieved by a small team of people with technical support by Foster Wheeler Energy Limited. No major problems were experienced by the project team other than the type of problems expected with a power plant project.

Areas of novelty required a careful and thorough approach and these included primarily, fuel receipt and testing and fuel and ash handling. Boiler combustion optimisation took longer for a conventional fuel but this was to be expected in view of the variability of the fuel.

The steam condenser, the main control and the turbine generator have all performed well. Taking into account the novelty of the fuel, the performance of the boiler and grate systems are broadly satisfactorily. Mechanical handling equipment has generally been problematical. All these problems, where appropriate, have been, or are being, rectified under warranty. The performance of the electrostatic precipitator has been lower than expected. This is due in part to the higher fuel moisture and gas velocities but the unit is still being optimised and we expect lower particulate emission figures in the near future.

The project has been a considerable technical success based on the experience gained in handling a biomass fuel with great differences in physical and calorific qualities.

The monitoring of the performance was carried out by independent consultants acting the Department of Trade and Industry's Energy Advisory office, ETSU. Their main findings were :

Energy production : Gross 13.5 MW
Energy production : Net 12.5 MW
Steam temperature : 450 deg. C
Steam pressure : 65 bar
Steam flow 50 t/h
Boiler rating : 56 MW
Boiler efficiency : 81.4%, on net CV
Generator efficiency : 83.8%
Generator Voltage : 11 kV
Export Voltage : 33 kV
Feedstock : Poultry Litter
Annual Usage : 150,000 t
Variation in fuel quality : 6.5 - 12.0 kJ/kg
The electricity produced was all sold to the Non Fossil Purchasing Agency buying on behalf of the 12 Regional Electricity Companies.
The project consists of the design, construction and operation of a 10 MW power station. The power station will consist of a water tube boiler plant generating steam at 67 bara and 425 degrees C. The condenser for the steam turbine will be air cooled.
The boiler is a 3 pass, natural circulation, single drum boiler of integral construction. There is no refractory used in the combustion area. All surfaces will be water-cooled. It will have a reciprocating grate.
The plant will be fuelled by poultry litter which has a typical moisture content of 30%, a calorific value of 11.4 mJ/kg and an ash content of 11%. The ash is very alkaline (pH 13.0) and may have some value as a specialist fertiliser, since it has a relatively high content of phosphate and potash, but no nitrate.
The P and K, however, have low solubility and the ash will consist of a high proportion of fines, which may require pelletising or further processing in order to become marketable.
The innovative elements of the system are :
1. A specially designed fuel handling and infeed system to cope with a fuel with a moisture content varying between 15% and 45%.
2. A specially designed air infeed system which provides flexible control of primary and secondary air to cope with the varying requirements of the fuel whilst meeting the stipulations of the EC Directive for Municipal Waste Incineration for new plant.
3. An ash handling system which copes with relatively high volumes of an abrasive and alkaline product which must be handled dry for marketing purposes.
4. The electricity will be produced at 33,000 kV and fed into the local distribution networks.
5. The plant will use approximately 125,000 tpa of litter and will produce 14,000 tpa of ash.
6. The capital costs of the project will be of the order of 1,250 UKL per kW.

Invito a presentare proposte

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Meccanismo di finanziamento

DEM - Demonstration contracts

Coordinatore

Fibrowatt Ltd
Contributo UE
Nessun dato
Indirizzo
38 Clarendon Road
W11 3AD London
Regno Unito

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Costo totale
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