Explanatory Notes For Biofuel - Man L23/30DF Project Manual

MAN Diesel & Turbo
3700063-9.0
Page 1 (2)
Operation with biofuel
Please contact MAN Diesel & Turbo at an early
stage of project.
Requirements on plant side
Biofuel has to be divided into 3 categories.
Category 1 – transesterified biofuel
For example:
▪ Biodiesel (FAME)
Esterified biofuel is comparable to MDO (ISO-F-
DMB/ ISO-F-DMC), therefore standard layout of fuel
oil system for MDO-operation to be used.
Category 2 – not transesterified biofuel and pour
point below 20°C
For example:
▪ Vegetable oil
▪ Rape-seed oil
Not transesterified biofuel with pour point below
20°C is comparable to HFO (ISO-F-RM), therefore
standard layout of fuel oil system for HFO-operation
to be used.
Category 3 – not transesterified biofuel and pour
point above 20° C
For example:
▪ Palm oil
▪ Stearin
▪ Animal fat
▪ Frying fat
Caution:
Not transesterified biofuel with a pour point above
20° C carries a risk of flocculation and may clog up
pipes and filters unless special precautions are
taken.
Therefore the standard layout of fuel oil system for
HFO-operation has to be modified concerning fol-
lowing aspects:
▪ In general no part of the fuel oil system must be
cooled down below pour point of the used bio-
fuel.
2015.11.26

Explanatory notes for biofuel

L28/32S, L27/38S, L23/30S, L21/31S, L16/24S, V28/32H, V28/32S, L16/24,
L21/31, L23/30H, L27/38, L28/32H
▪ Fuel cooler for circulation fuel oil feeding part =>
to be modified.
In this circuit a temperature above pour point of
the biofuel is needed without overheating of the
supply pumps.
▪ Sensor pipes to be isolated or heated and loca-
ted near to main pipes.
▪ To prevent injection nozzles from clogging indi-
cator filter size 0.010 mm has to be used
instead of 0.034 mm.
Additionally:
▪ Fuel oil module to be located inside plant (to be
protected against rain and cold wind).
▪ A second fuel type has to be provided of cate-
gory 1 or 2.
Due to the risk of clogging it is needed before
each stop of the engine, to change over to a
second fuel type of category 1 or 2 and to oper-
ate the engine until the danger of clogging of
the fuel oil system no longer exists.
B 11 00 0