Operation
Exhaust gas after-treatment
102
BA RC50_RC70 en 00
3.22 Exhaust gas after-treatment
Goal: Lowering emissions
Harmful constituents in the exhaust gas (such as carbon monoxide,
unburnt hydrocarbons, diesel particulate, nitrogen oxides etc.) are
reduced/converted in catalysers or collected in special filters to prevent
them escaping into the environment.
For that purpose, Wacker Neuson uses the following components:
■
Diesel oxidation catalyst (DOC)
■
Diesel particulate filter (DPF)
■
SCR catalytic converter (SCR = selective catalytic reduction)
Diesel oxidation catalyst (DOC)
The diesel oxidation catalyst has a catalytic surface, which oxidises the
carbon monoxide and unburnt hydrocarbons. In addition, it oxidises
nitrogen monoxide, turning it into nitrogen dioxide.
In normal operation, these oxides are burnt at a high exhaust gas
temperature.
Diesel particulate filter (DPF)
The sealed diesel particulate filter collects all the diesel particulates. At a
sufficiently high exhaust gas temperature, they are burnt with the nitrogen
dioxide. This enables the diesel particulate filter to be continuously and
automatically regenerated during operation.
Ash deposits, e.g. from lube oil residues or metal abrasion, cannot
be removed from the diesel particulate filter by thermal regeneration.
Therefore, the diesel particulate filter has to be replaced at certain
intervals.
Malfunctions in the exhaust gas after-treatment system
If there is a fault in the exhaust gas after-treatment system, warning and
indicator lights appear on the control panel. Error codes are displayed on
the info display/system info.
3.22.01 Initiating parked regeneration
If the temperatures required for automatic cleaning of the exhaust gas are
not reached during operation, the elements for the cleaning the exhaust
gas must be cleaned with the parked regeneration function. For this
purpose, the machine must be brought to a safe place. It is only possible
to start parked regeneration when the parked regeneration switch
flashes.
WARNING
High exhaust temperature, increased exhaust emission!
Serious injuries as a result of burning or poisoning by exhaust gases
during the park regeneration.
■
Keep a safe distance away from the flow of exhaust gas.
■
Perform park regeneration only in the open air or in well ventilated
rooms.
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