TY - JOUR
TI - Assessing the impact of specific weight of different-sized particles on operational performance of coal preparation plant
AU - Stamenković Ognjen S
AU - Stupar Goran M.
AU - Tucaković Dragan R
JN - Thermal Science
PY - 2023
VL - 27
IS - 1
SP - 103
EP - 119
PT - Article
AB - In case of firing pulverized coal in power steam boiler certain fuel  preparation process has to be taken in order to ensure stable and optimal  combustion in boiler furnace. Before entering furnace low caloric coal is  introduced from coal bunker to the coal preparation system where  milling/pulverization and drying processes of raw large coal particles are  conducted. For the purpose of defining fineness of grinding of pulverized  coal mill gaseous mixture at mill outlet is introduced to the separator  where large coal particles, separated from outgoing mill gaseous mixture,  are recirculated to mill for regrinding. In this paper character of  two-phase flow in inertial separator at milling plant in TPP Nikola Tesla  Unit B under various operating conditions has been analyzed. The CFD  approach has been used for calculating two-phase flow in separators flow  domain. Measurement data taken on site along with results of performed heat  balance calculations of milling plant have been used for validating  calculation model as well as for setting appropriate boundary conditions in  CFD model. The CFD calculations has been performed for different positions  of all regulating flaps, recirculation rates of gaseous phase and values of  specific weight of solid phase in two-phase mixture. For evaluating  separators operating performance at different operating regimes changes of  milling capacity and fineness of grinding of pulverized coal at separators  outlet have been observed. Additionally, deviation rate of trajectories of  different-sized particles to the streamlines of gaseous phase has been  examined.