5.4 Cleaning turbines and guide blades in operation


Combustion of heavy fuel oil in diesel engines causes soiling of the turbine blades and guide blades of the turbochargers. The deposits on the turbine components are caused by the following products of combustion:
-Soot
-Molten ash
-Cinders
-Incompletely burned fuel
-Sodium vanadyl vanadate

Therefore, it is advantageous to use fuels with a low content of ash, sulphur, sodium and vanadium. The fuel must also be stored, prepared and handled correctly.
 
NOTE

We recommend the use of fuels with a mass ratio of vanadium to sodium less than 3:1, so that the melting point of the sodium vanadyl vanadate is as high as possible.


Soiling increases with time, so that regular and properly performed cleaning is important to remove the accumulated deposits. The charging pressure can rise somewhat if the turbine profile is constricted
due to fouled turbine components. Contamination causes loss of performance in the turbine and the engine temperature after the cylinders can increase. This may mean that the engine output has to be reduced.
A soiled turbine also results in rotor unbalance. Severe soiling can lead to impermissibly high rotor imbalance.
Experience in operation has shown that despite periodic cleaning during operation, it is impossible to dispense with overhauls during which the turbine and nozzle ring are mechanically cleaned. However, if cleaning is performed correctly and the cleaning system is properly dimensioned, the intervals between overhauls can be extended.


Cleaning method
The turbine and nozzle ring are cleaned while operating using the cleaning method described in the following. This method has been tested and is approved by ABB Turbo Systems:

-Wet cleaning

NOTE

The dry cleaning method may be used as an alternative to wet cleaning. However, this is not the preferred method, and must be approved by an official ABB Turbo Systems service station.


 5.4.1 Wet cleaning the turbine and guide blades during operation

NOTE

This work on the TPL..VA must only be carried out after consultation with ABB Turbo Systems.


          1. Purpose of the manual
          2. Layout and function
          3. Correct use of the turbocharger
          4. Essential information
          5. Abbreviations and symbols
          6. Turbocharger rating plate
          1. Basic safety instructions
          2. General safety instructions
          3. Special safety instructions
          4. Safety instructions and hazard protection
          5. Warnings on the turbocharger
          1. Oil supply
          2. Inspection work
          3. Putting into operation after laying up
          1. Servicing work
          2. Monitoring
          3. Emergency mode TPL..VA
          4. Surging of turbocharger
          5. Contact with rotating parts
          6. Shutting the engine down
          1. Foreword to MaintenanceServicing work
          2. Cleaning the filter silencer
          3. Cleaning the compressor during operation
          4. Cleaning turbines and guide blades in operation
          1. Possible remedies for failures
          1. Turbocharger weights
          2. Remove the turbocharger
          3. Installing the turbocharger
          1. Module weights
          2. Remove filter silencer/air suction branch and compressor casing
          3. Removing cartridge group
          4. Axial clearance
          5. Disassembling and assembling the turbine diffuser
          6. Dismantle the VTG unit together with the gas inlet casing
          7. Installing the VTG unit and gas inlet casing
          8. Installing the cartridge group
          9. Install filter silencer/air suction branch and compressor casing
          10. Table of tightening torques
          1. Possibilities for emergency repair
          2. Fitting the cover plate
          3. Blocking the inlets and outlets
          4. Bypass the turbocharger
          1. Taking out of operation for up to 12 months
          2. Taking out of operation for more than 12 months
          1. Ordering spare parts
          2. Directory of part numbers
          3. General view of turbocharger
          4. General view of cartridge group
          5. General view of VTG unit



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