The paper studies the motion of scrap tire shreds in a moving and stirred bed vacuum pyrolysis reactor. The reactor configuration is a novel concept. The pattern and the residence time distribution (RTD) of the particle motion in the reactor were investigated using tracers, for different feed rates and blade speeds. It. was shown that the particle motion in the reactor is plug flow nature with intermediate dispersion (sigma(2) = 0.02-0.055). The mean residence time is in the range of 7-23 min, depending on the speed of the blades and the feed rate. The ratio of mean particle speed and the speed of blades v(m)/v(b) varied between 0.03 and 0.07.