Analysis of liquid-solid two-phase Turbulent Flow in FGD system pump

The paper calculated liquid-solid two-phase turbulent flow in FGD systems pump with double volutes based Navier-Stoker and standard k -¿ equations, and emphatically analyzed the motion and distribution laws of solid phase, the influence of the volume fraction of solid phase, particle diameter on the external characteristic of pump. The results show that the distribution of solid phase in the pump is uneven seriously. In the impeller passage, solid particles cling to and even impact the pressure face, the volume fraction of solid phase in pressure face is higher than that in suction face, which could cause severe wear and tear in outlet of impeller; while in the volute chamber passage, the distribution of the volume fraction of solid phase is also uneven because of the interaction of velocity between impeller and volute , most particles cling to the outer edge; the change of the volume fraction of solid phase has little effect on particle distribution in the pump, but particle size has more effect on its distribution, particle tend to pressure face increasingly with larger particle size in research scope; under the working point, the total pressure difference between inlet and outlet increases and the head descends as the increasing of volume fraction, while the pressure difference descends with particle size increasing, as well as the head.