Refuse Derived Fuel (RDF)
27 July 2009, News release from Riverside Waste Machinery
WHAT IS RDF?
Refuse-derived fuel (RDF) is a fuel produced by shredding municipal solid waste (MSW). Once the non-combustible materials such as glass and metals are removed the RDF material consists largely of organic, plastic and biodegradable waste.
The residual material can be sold in its processed form or it may be compressed into pellets, bricks or logs and used for other purposes either stand-alone or in a recursive recycling process.
RDF can be used in a variety of ways to produce electricity. It can be used alongside traditional sources of fuel in coal power plants. In Europe RDF can be used in the cement kiln industry, where the strict standards of the Waste Incineration Directive are met. RDF can also be fed into plasma arc gasification modules, pyrolysis plants and where the RDF is capable of being combusted cleanly or in compliance with the Kyoto Protocol.
HOW IS IT PRODUCED?
Waste substances undergo a series of varying processing stages. Recyclable product contents such as metal are removed from the mix, as are heavy fractions and unshreddable items. Following the drying and sizing-out process the remaining lighter material for thermal processing makes up approximately 40% of the material deposited at the beginning of the process. In this way valuable fuels can be generated from waste previously dumped into landfill sites in an unprocessed form.
As the biogenic share is 50% (wood, paper, organic substances), CO2 emissions are reduced by this amount in combustion; a financial advantage when it comes to the awarding of CO2 certificates. This also makes the use of alternative fuels attractive as regards co-combustion, particularly in high energy consumption sectors such as the paper and cement industries.
Two essential steps in acquiring alternative fuel materials from waste are pre-shredding and secondary-shredding of loads producing evenly-sized particles of <40mm. UNTHA has developed the XR and TR series for this purpose, being able to ensure constant quality and high throughput levels, efficiently and economically, when dealing with this type of waste.
For demonstration videos and further information, please visit RWM 2009 Stand 1056 or visit www.wastemachinery.co.uk. Alternatively telephone 0845 450 5388.
For further information please email Riverside Waste Machinery