Operation Manual / 4 Product description / A100-L
6 Periodic maintenance / 6.5 Cleaning the turbine during operation
© Copyright 2021 ABB. All rights reserved.
HZTL4034_EN
Rev.S
May 2021
6.5
Cleaning the turbine during operation
6.5.1
Introduction
Combustion of heavy fuel oil in diesel engines causes contamination of the turbine blades
and nozzle rings of the turbochargers.
Contamination increases with time, which is why regular and properly carried out cleaning
operations are important to remove any deposits.
Contaminated turbine components lead to a reduction in the turbocharger efficiency. Fur-
thermore, the exhaust gas temperature after the cylinders can rise and the charging pres-
sure in the air receiver can drop.
Contamination of the turbine also leads to rotor unbalance. A very high level of contamina-
tion can lead to intolerably high rotor unbalance.
Despite periodic cleaning during operation, experience shows that overhauls during which
the turbine and nozzle ring (or VTG) are mechanically cleaned cannot be omitted.
Cleaning method
The turbine and the nozzle ring are cleaned during operation using the dry cleaning method.
This cleaning method is tested and approved by ABB Turbocharging.
Interval for dry cleaning depending on the fuel used
The interval between the cleaning cycles depends greatly on the operating conditions and
fuel used.
¡
General recommendation: every 50 hours according to the cleaning instructions for the
dry cleaning unit (see chapter
Procedure for dry cleaning the turbine
).
¡
For HFO applications: every 50 hours.
¡
For mixed gas / HFO applications: taking the following conditions into consideration, the
cleaning interval can be increased to a maximum of 150 hours.
– Maximum 20% of operating time with HFO.
– Constant exhaust gas temperatures with a constant engine load.
– Provided that no excessive contamination is detected during standard inspections.
Principle of dry cleaning
During dry cleaning, the dirt coating is removed by the mechanical action of the impacting
solids (granulate).
Operating state
The dry cleaning of the turbine end components is carried out at an engine load of
5 … 85%.
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