Renewable Energy
Turning up the heat on energy from waste
Energy from waste (efw) facilities must utilise their heat potential to maximise both efficiency and carbon dioxide emissions savings.
La energía de las instalaciones (a partir) de residuos debe utilizar su potencial calorífico para maximizar la eficacia a la vez que ahorra emisiones de dióxido de carbono.
Anlagen zur Energieerzeugung aus Abfall müssen ihr Hitzepotential verwenden, um die Leistungsfähigkeit zu maximieren und Kohlendioxydemissionen zu minimieren.
E
nergy from waste (efw) plants should exist within the heart of industrial and residential communities to utilise the heat value of the waste instead of wasting this renewable, low cost
energy resource. Tat was the message from Nick Dawber,
Managing Director of UK-based Energos to Te Waste to Energy City Summit, held in London this summer. Te Summit brought together innovative technology developers and waste management companies with the city’s financial community and policy-makers to identify emerging investment and development opportunities in gasification and pyrolysis for municipal and industrial waste.
Mr Dawber said: “To achieve higher levels of efficiency we need to sell heat - either directly as steam to industrial customers to displace existing fossil fuel supplies - or as combined heat and power (CHP). When the ratio of energy used is two parts heat to one part electricity, facilities will achieve up to 50 per cent efficiency, which rises to as much as 85 per cent if you utilise the full heat potential.” He explained that it is necessary to develop smaller efw plants to capitalise on heat potential since there are more available sites for small facilities, which can be located close to the potential demand for heat and are appropriately sized to satisfy that heat requirement. He also said that there will be higher public acceptance for ‘community sized’ facilities. Smaller plants minimise traffic to the site and can sit alongside recycling facilities to provide a local solution for local non-recyclable waste while delivering a renewable supply of low carbon, low cost energy. Mr Dawber called on the government to accelerate the development of district heat networks, as demanded under the EU Energy Efficiency Directive, to avoid valuable heat resources being wasted. He stated that a large 400,000 tonnes per annum efw plant, producing around 32MW of electricity, would have a surplus of around
Figs. 1 and 2. External view of at Energos’ newest clean energy recovery facility at Borregard Industries, Sarpsborg, Norway.
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