TOWERING INFERNO: Reaches Sky-High Efficiency - Waste Management World

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Crown Capital Eco Management
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TOWERING INFERNO Reaches Sky-High Efficiency -
Waste Management World
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• New political winds are blowing across Europe.
  The aim is resource efficiency but the means to
  this end are unclear. In the Energy Tower a new
  waste to energy facility in Roskilde, Denmark -
  every effort is being put into maximising the
  recovery of the energy resource embedded in the
  waste.

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• Again and again we hear the message that
  resources are scarce, and that we have to ensure
  that they are not lost in our waste. Explanations
  as to which resources we are talking about and
  how we avoid wasting them, however, are in short
  supply.
• Waste may contain many different resources
  depending on origin and prior use. The resources
  of waste may be considered a material resource,
  an energy resource or a nutrient resource, and
  typically a waste fraction will comprise a
  mixture of these in varying quantities.

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The Energy Tower

• The utilisation of the energy resource of waste
  is the objective of a new facility, dubbed the
  Energy Tower, in Roskilde, Denmark. The design of
  the facility is focused on maximum utilisation of
  the energy resources in the waste, such that it
  may be harnessed with practically no losses.

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Energy Optimisation
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• In the Energy Tower waste is utilised through
  conversion into energy in the form of electricity
  and district heating. The focus is on reaching
  the highest possible efficiency in order to avoid
  any loss of resources. The plant's waste
  treatment process produces heat in the boiler
  room which is used for the production of steam in
  the boiler. Through this process some 85 - 90
  of the energy content of the waste is transformed
  into steam, and the steam is subsequently
  converted to electricity as well as district
  heating.

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Feedstock Finance
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• The new 175 million Energy Tower is being built,
  financed, owned and operated by KARA/NOVEREN - an
  inter-municipal waste management company owned by
  nine municipalities west and south of Copenhagen.
  In addition to the Roskilde waste to energy
  facility, which includes three units from 1981,
  1989 and 1999, the company operates 14 civic
  amenity sites, a recycling station, a landfill
  site for residual waste and two transfer stations.

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Energy recovery and recycling in Parallel
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• At the same time we have to increase the effort
  to maximise the recovery of energy from residual
  waste, which cannot be recycled in a sustainable
  manner.
• Denmark has for many decades demonstrated that
  high recycling rates, even among the highest in
  the world, are compatible with waste to energy,
  and that with innovative thinking and dedicated
  effort both recycling and energy efficiency can
  be further increased in parallel.

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• The high energy recovery efficiency in the Energy
  Tower is achieved by combining and integrating
  the design of the boiler with the flue gas
  treatment. During the incineration process,
  energy is extracted from the combustion by
  production of steam in the boiler while the
  temperature of the flue gas is decreased.
• At the end of the boiler system the temperature
  is reduced to approximately 170C. At this point,
  the flue gas is contaminated with dust and acidic
  components so further reduction of the
  temperature would cause operational problems with
  condensation of liquid acid. This would not only
  increase the corrosion of steel components, but
  also result in fouling on tubes etc. Therefore
  further energy recovery must be done after
  de-dusting of the flue gas and by equipment made
  of corrosion-proof materials.