Numerical Analysis of Erosion Wear of Impeller of Desulfurization Circulating Pump in Thermal Power Plant
In order to further study the influencing factors and laws of impeller impact corrosion under real working conditions,the impeller of the circulating pump was numerically simulated under different solid particle sizes and different solid particle volume fractions based on the dense discrete phase(DDPM)model by using the CFD numerical simulation method.The results show that when the particle size is less than 0.20 mm,the erosion amount of the blade working face increases the fastest,reaching 38％,and with the increase of particle size,the erosion position on the working face shifts to the rear cover,and the extreme value of erosion occurs at the inlet edge of the blade.Under different particle volume fraction conditions,the erosion position on the working face shifts to the outlet with the increase of particle volume fraction.A solid particle volume fraction of more than 30％will aggravate the erosion of the leaf working face.The growth rate of erosion at the inlet edge and back of the blade was relatively stable,basically remaining at around 20％.It can be seen that small particles have a great influence on the erosion amount of the leaf working face,and large particles are more likely to accelerate the erosion of the inlet edge of the blade.The erosion of the working face is more obvious by the high particle volume fraction.
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