Numerical simulation on the effect of different baffle tilt angles on particle drifting in high temperature and high pressure separator

To study the pulverized coal drifting in high temperature and high pressure (HTHP) separator in coal lique- faction unit,the physical model of HTHP separator with static separation baffles was established. The volume of fluid (VOF) model and the discrete phase model (DPM) were used in this numerical simulation to analyze the distribution regularities of interior velocity field,the averaged particles concentration in different heights and the pulverized coal drifting ratio in gas phase outlet with five kinds of baffle tilt angles. The results show that the tilt angle of separation baffles has a great influence on the velocity field,the vortex effect occurs near the baffles;the mean particles concen- tration becomes maximum in the area of gas-liquid interface,then decreases gradually with the increase of height;the pulverized coal drifting ratio in gas phase outlet reaches minimum if the tilt angle is 45°,which can reduce more than 50% compared to no static separation baffles. The research results can provide a valuable reference for optimizing the design and operation in HTHP separator.