Optimal integrering av energianvändningen vid ... - Gasefuels AB

Executive Summary
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VÄRMEFORSK
Händelö combined energy plant
Figure 1 shows an overview of the combined energy plant at Händelö. The ethanol plant
produces about 200 000 m 3 of ethanol and 200 000 tonnes of dried distillery residues
per year. A small amount of distillery residues is used for a biogas production of 26
GWh/year. For the ethanol process, 600 GWh/year steam is used from the CHP
(Combined Heat and Power plant). Distillery residues are delivered by a temperature of
40 - 80 °C so that no additional heating is needed in the biogas plant.
Cereals
Steam
CHP
Ethanol plant
Condensate
Figur 1. Energikombinatet på Händelö.
Distillery residues
Forage
Ethanol
Figure 1. Combined energy plant at Händelö.
Biogas
Biogas plant
Biogas upgrading unit
The ethanol plant uses 50 % of the steam to feed the dryers for drying of distillery
residues and the rest is primarily used for the distillation process. A condensate flow at
110 °C is fed back to the CHP. The distillery residues are decomposed into biogas and
biofertiliser by anaerobic digestion. The biogas is purified mainly from hydrogen
sulphide, water and particles. In order to increase the energy content, the gas is
upgraded by carbon dioxide removal. See the gas composition in raw biogas and
upgraded gas in Table 1.
Biofertiliser
Vehicle fuel gas