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Energy from the sea : hydrothermal liquefaction of algae

Bhagwandas, J.C. (2015) Energy from the sea : hydrothermal liquefaction of algae.

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Abstract:Cultivated brown macro-algae harvested in the summer of 2014 in Trondheim Bay, Laminaria saccharina, were converted into bio-crude by hydrothermal liquefaction in a batch reactor. The influence of the different type of storage conditions [smoothie, freeze and oven-dried powder] and the different reaction temperatures [200, 300, 350 degrees] was assessed. The general conclusion that can be drawn is that the oil yields of all the experiments were extremely low. The product yields of the freeze and oven-dried powder as feedstock were more or less the same, while the yields of the smoothie as feedstock were not as expected. The explanation for this is that probably the smoothie was still not homogenous enough compared to the freeze and oven-dried powder. The product yields of the freeze and oven-dried powder were the highest for the experiments with a reaction temperature of 300 degrees. The low heating rate of the batch reactor, losses during processing, influence of the errors in the balance which were higher than normal due to the relatively small quantities of oil, making use of a separation method that still can be improved, a batch of Lamminaria Saccharina with a low content of carbohydrates and the possibility of a hydrothermal carbonization process instead of the actual hydrothermal liquefaction process are all statements which could have caused the extremely oil yields in general.
Item Type:Internship Report (Master)
SINTEF Energy Research, Norway
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:Hydrothermal liquefaction, Algae
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