HEAT TRANSFER UNDER IGNITION OF DROPLET OF COMPOSITE LIQUID FUEL MADE OF COAL, WATER AND OIL IN AN OXIDANT FLOW

摘要

This paper presents the results of experimental investigations of heat transfer under ignition of the modern composite liquid (suspended) fuel made of fine particles of coal, water and oil. We defined minimum temperatures of oxidant (air) when the ignition with the subsequent stable burning of fuel droplets (sizes from 0.5mm to 3mm) is possible. Here, the delay times of droplet ignition (from 4s to 26s) and complete burning (from 5s to 32s) for fuels with various blend compositions and heating times (oxidant temperature varied from 500 to 1500K) were determined. We separated the typical steps of studying processes and defined the dominant mechanisms of heat transfer in the "fuel droplet-oxidant" system.