High pressure combustion of wood pyrolysis oil 2001-24-0025
Combusiton of pine pyrolysis oil droplets was studied at
different pressures up to a maximum of 60 bar in a single-droplet
combustion chamber. Oil droplets, with diameters between 400 μm
and 120 μm were suspended to a thermocouple of to a quartz fiber.
Their behavior was followed by means of high-speed digital imaging
based on a shadowgraph scheme. About two thousands of frames were
collected during every test with acquisition speed between 400 and
Droplets were easy to ignite at normal as well as at high
pressure. Increasing the pressure the intensity of swelling
phenomena, undergone by droplets, decreased and completely
disappeared at pressures higher than 20 bar. However, bubbling and
foaming were always observed. Liquid-phase pyrolysis and the
formation of cenospheres as combustion residual were observed under
all the pressure conditions.