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Zawartość zarchiwizowana w dniu 2022-12-27

RDF FLOCK FIRED POWER PLANT

Cel

The project aims to demonstrate that existing transfer stations can be converted into low cost incineration plant producing electricity in an environmentally acceptable manner. The plant aims to convert 100,000 tonnes per year of raw refuse into a fuel suitable for a suspension firing boiler supplying steam to a 7.23 MW turbo-alternator. The plant will produce 39,400,000 kWh/yr and have a payback period of three years.

The annual input of raw refuse is 122,500 tonnes of which 90,000 is municipal refuse and 32,500 tonnes is trade, commercial and hospital waste. After removal by hand of large combustibles, the waste undergoes single stop pulverisation at the rate of 50 tonnes/hr to a size of < 100 mm. The pulverized fuel is conveyed under a magnetic separator to remove ferrous metals and then to a turned screen. This removes the bulk of dust, ash, glass and high moisture putrescibles <40 mm which is disposed of off-site. What remains is an RDF in particle size 40-100 mm and around 80% combustible. The RDF is held in a novel automated fuel store of 175 tonne capacity which receives RDF by conveyor and overhead sprinkler to spread the fuel evenly over the base of the stone. It has a 'live bottom' screw extractor system. From the store, the RDF is air conveyed to two frazer water tube boilers. The boilers are engineered for suspension firing. The project will include burning trials for optimising thefiring.
Boiler consumption is 11,08 tonnes/hour of RDF and produce steam at 350 degrees centigrade and 25.14 bar. The superheated steam is supplied to the main 7,800 kW turbo alternator, power production for sale, and to a subsidiary 260 kW alternator for in-house power. This 260 turbine also supplies steam for raising the feed water temperature.
Two-stage gas cleaning is employed to reduce stack emission to the best EEC regulations. Boiler flow gas at 280 degrees centigrade is first passed through a cyclone grit arrestor of 75% efficiency and through an economiser where gas temperatures fall to 160 degrees centigrade by heat exchange with boiler water feed. Finally, the gases pass through a wet gas scrubber.
The innovatory aspects relate to the production of the 50 - 200 mm controlled size range RDF in a fluff or shredded form; the use of suspension firing in low cost boilers, and the flue gas clearing.

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Koordynator

Industrial Refuse and Coal Energy Ltd
Wkład UE
Brak danych
Adres
10 Lake Road Wimbledon
SW9 7EN London
Zjednoczone Królestwo

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Koszt całkowity
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