A Modern HD-Diesel Engine with Rapeseed Oil, DPF and SCR 2008-01-1382
A modern HD-Diesel engine for construction machines, Liebherr D 934L (120kW) was set-up for a monofuel operation with crude, cold pressed rapeseed oil (ROR)*). The engine was equipped with a supplementary fuel filtration, supplementary engine & fuel heating for cold start and an appropriate fuel temperature control for the engine operation. A special lube oil was applied.
After an extensive basic research of emissions including nanoparticles and energy consumption some adaptations of engine setting were performed:
modification of the camshaft to eliminate the internal EGR (same valve timing and lift),
earlier start of injection (SOI) at high- and full load,
application of a combined exhaust gas aftertreatment system DPF+SCR,
testing of DPF+SCR according to the VERT quality verification procedure.
It can be stated that:
there is a very good startability with the auxiliary heating,
with the earlier setting of SOI there is a lower specific energy consumption and the higher NOx are converted by the SCR,
the maximum injection pressure of the camdriven unit pumps system (up to 1600 bar at nominal power) does not attain prohibitive values for the durability limits,
with an urea-consumption of 1l/h there is a deNOx-efficiency of 94%,
filtration efficiency of the used DPF is up to 97% for mass and up to 99.97% for counts,
the emissions values of the installation fulfil the LRV - Swiss Clean Air Regulation for stationary applications.
With a care for continuous ROR-Quality and with an appropriate maintenance and inspection the working team believes to be successful in the long term service.