Numerical Simulation on Fluid Phenomena of Gas-Liquid-Solid Flow in High Temperature and Pressure Separator

摘要

Pulverized coal drifting commonly exists in particles-containing multiphase flow in coal liquefaction unit, which easily lead to failure of the clogging deposit in the downstream region of separation system and cooling equipment. Pulverized coal drifting in high temperature and high pressure (HTHP) separator was studied in this paper by using the Euler-Lagrangian approach. The Standard turbulent model was used to simulate complex multiphase flow in HTHP separator. Here the ratio of pulverized coal drifting is defined as mass percentage of the pulverized coal exported from gas phase in total inlet pulverized coal. Based on the Standard turbulent model, flow velocity, particle trajectories and ratio of pulverized coal drifting is analyzed by changing technical parameters including liquid-level, mass flux, particle size and particle concentration in gas phase. It can be concluded that ratio of pulverized coal drifting increases with the decrease of particle size and it enhances significantly if particle diameter is smaller than 60um;; the extent of pulverized coal drifting seems not relative with solid concentration change within a low scope of solid concentration in gas phase.