The harsh operation conditions, involves high concentration of pulverized coal particles, high temperature and pressure, are often exist in coal chemical industries. Therefore, the leakage or perforation of pipeline occurs frequently and leads to the unscheduled shutdowns. In this paper, the erosion wear of a multiphase flow pipeline containing solid particles with 9.65% of mass concentration and 5 μm ~ 200 μm of diameter range was investigated by n merical simulation. The methodology of Dense Discrete Phase Model-Kinetic Theory of Granular Flow (DDPM - KTFG) was adopted to calculate the particles trajectories and erosion rates. In addition, the impact angles function and velocity exponent in the erosion model were modified by the erosion curves of 1Cr9Mo steel in the gas-solid erosion experiments. The results showed that the pulverized coal particles are concentrated in the back region of bends and then lead to the dense collision of particles. Simultaneously, the particles with high velocities and low impingement angles impact on the steel surface continuously, results in the extremely high erosion rates in this region. The position of high erosion rates locates 25 °~ 55 ° along the flow direction in the bend and 250 ° to 290 ° in the cross section. The results are consistent with the actual failure instance.