●
Between 5% and 10% MCR Max continuous operation time: 15 min; Requirements before
further operation at low load can be continues: above 20% load for 30 min or change to
back-up fuel (trip to diesel is also included as an automatic back-up feature)
●
Above 10% MCR No restrictions
Gas (MN<70)
●
Idling Max continuous operation time: 3 min; Requirements before further operation at low
load can be continues: above 20% load for 30 min or change to back-up fuel (trip to diesel
is also included as an automatic back-up feature)
●
Below 10% MCR Max continuous operation time: 5 min; Requirements before further
operation at low load can be continues: above 20% load for 30 min or change to back-up
fuel (trip to diesel is also included as an automatic back-up feature)
●
Above 10% MCR No restrictions
NOTE
Typically, less strict requirements for the operation can be set based on a detailed
analysis of project specific conditions such as operational profile, fuel composition
and engine type and tuning.
In low load gas operation the oxidation of unburned hydrocarbons on the catalyst
elements can increase the temperature above the limit for catalyst elements and/or
the exhaust gas system. The extent of the temperature increase depends on
combustion parameters, operational profile, ambient conditions and especially on
the gas compositions.
The solution for allowing trouble free operation in low load gas operation includes
the following:
1) Use of dilution air to provide cooling in low load operation.
2) Recommendations for duration of low load operation. These recommendations
will in normal conditions ensure that the temperature will remain in the allowed
area.
3) SCR temperature monitoring will trigger a transfer to liquid fuel operation to
protect the SCR in situations with increased temperatures.
DBAD209883 2-7
2. Operating RangesWärtsilä 46DF Product Guide
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