A Modern HD-Diesel Engine with Rapeseed Oil, DPF and SCR

Abstract

<div class="htmlview paragraph">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)<span class="xref">*<sup>)</sup></span>. 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.</div> <div class="htmlview paragraph">After an extensive basic research of emissions including nanoparticles and energy consumption some adaptations of engine setting were performed:</div> <div class="htmlview paragraph"> <ul class="list disc"> <li class="list-item"><div class="htmlview paragraph">modification of the camshaft to eliminate the internal EGR (same valve timing and lift),</div></li> <li class="list-item"><div class="htmlview paragraph">earlier start of injection (SOI) at high- and full load,</div></li> <li class="list-item"><div class="htmlview paragraph">application of a combined exhaust gas aftertreatment system DPF+SCR,</div></li> <li class="list-item"><div class="htmlview paragraph">testing of DPF+SCR according to the VERT quality verification procedure.</div></li> </ul> </div> <div class="htmlview paragraph">It can be stated that:</div> <div class="htmlview paragraph"> <ul class="list disc"> <li class="list-item"><div class="htmlview paragraph">there is a very good startability with the auxiliary heating,</div></li> <li class="list-item"><div class="htmlview paragraph">with the earlier setting of SOI there is a lower specific energy consumption and the higher NO<sub>x</sub> are converted by the SCR,</div></li> <li class="list-item"><div class="htmlview paragraph">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,</div></li> <li class="list-item"><div class="htmlview paragraph">with an urea-consumption of 1l/h there is a deNO<sub>x</sub>-efficiency of 94%,</div></li> <li class="list-item"><div class="htmlview paragraph">filtration efficiency of the used DPF is up to 97% for mass and up to 99.97% for counts,</div></li> <li class="list-item"><div class="htmlview paragraph">the emissions values of the installation fulfil the LRV - Swiss Clean Air Regulation for stationary applications.</div></li> </ul> </div> <div class="htmlview paragraph">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.</div>