Construction of simplified combustion mechanism of diesel from direct coal liquefaction-PODE3

Abstract

DDCL (Diesel from Direct Coal Liquefaction) and PODEn (Polyoxymethylene Dimethyl Ethers) are alternative fuels commonly used for Diesel engines. Their blend has close cetane number to diesel fuel. N-dodecane and decalin were selected as model fuels of DDCL. Based on the decoupling method, initial simplified combustion mechanism reaction paths were constructed, and the sensitive reaction rate parameters were optimized by PSO (Particle Swarm Optimization). Then the simplified combustion mechanism of DDCL was constructed by combining the mechanisms of the two fuels, and the NOx mechanism was combined to form the DDCL-PODE3-NOx mechanism. Moreover, the prediction performance of the simplified mechanism was verified via JSR (Jet Stirred Reactor) test, and the results proved that it can provide a reliable prediction of the ignition delay time and species concentration distribution. Eventually, the DDCL simplified mechanism contains 156 components and 617 reactions. The PODE3 mechanism contains 149 components and 597 reactions, and the DDCL-PODE3-NOx simplified mechanism contains 171 components and 642 reactions. Constructing fuel combustion mechanism is the basis of fuel combustion research. Most significantly, the simplified combustion mechanism shows excellent prediction in the basic combustion test data.