Page 171 - Advances in bioenergy (2016)

Figure 7.7 Flow sheet of the FT test rig in Güssing.

With this project it was possible to demonstrate the production of pipeline ready BioSNG from
wood using the Güssing BioSNG demonstration unit. It was also shown that the chemical
efficiency of more than 60% from wood chips to BioSNG could be reached in practice, which

is excellent. 36

FT Synthesis

Within the EC project RENEW the second synthesis, which was synthetic diesel production
37
via FT synthesis was investigated. A laboratory scale Fischer-Tropsch-Reactor (slurry
reactor) in a side stream of the existing allothermal fluidized bed gasifier was designed and
installed. During the experiments different combinations of the gas cleaning devices, different
catalysts, and operation parameters were tested.

The FT liquids produced during operation were collected, analyzed, and used for further

processing, like hydrotreating, or are used direct in diesel engines for testing.
The FT synthesis (Figure 7.7) consists of a gas treatment, where catalyst poisons are removed
to below 10 ppb and the gas is dried and compressed. The FT reaction takes place in a slurry

reactor (three phases: catalyst, gas, waxes) with a volume of 20 L. The gas and the FT product
leaves the reactor over sintered metal filters. After the FT-reactor, the FT products are
separated from the tailgas and collected. 38

The collected FT products are distilled. The fraction up to 180°C is used as naphtha, from
180°C to 320°C as diesel and the fraction above 320°C are waxes.

Furthermore, investigations on hydrotreating of FT-biowaxes for generation of bio-products
from lignocellulosic biomass were carried out with the industrial partner OMV. 39