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From waste to watts. . .how the energy from waste plant will work

CONCRETE ENGINEERING

The Colnbrook plant will consist of two furnaces, each capable of burning 27t of waste per hour; 400,000t per year. The heat from the process will be used to generate 36.1MW of electricity for the local grid.

Vehicles will drive to an enclosed tipping hall where waste will be dumped into a storage bunker. Two cranes positioned above the bunker will mix the waste and feed it into a loading hopper, which will place the waste onto the grate at a controlled rate. Combustion air will be drawn from above the bunker in order to keep the tipping hall under a slight negative pressure and prevent the release of odour. 'Clean' waste suitable for recycling will be tipped into a hopper at the end of the tipping hall and dropped into a materials recycling facility below.

The combustion grate where the incineration of the waste occurs will be made up of fixed and moving bars supplied with air from below that will control the waste's movement and constantly mix it. This will ensure that all the waste is exposed to the combustion process.

Hot gases from the furnace will pass to a boiler, which will convert the energy from the gases into superheated steam.

The steam from the boiler will feed a steam turbine driving an electrical generator, which will produce the electricity.

An air-cooled condenser will liquidise the spent steam and this condensate will be returned to the boilers.

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