Abstract: The erosive wear in pipelines carrying multiphase flows containing solid particles is a key concern within the petrochemical sector. Coal powder particles present in the process streams of petrochemical plants such as coal liquefaction and coal-to-olefins plants cause erosive wear damage to pipelines, compromising their service life and creating safety hazards. Based on computational fluid dynamics (CFD) methods, the erosive wear of gas-liquid-solid three-phase flow pipe elbows of a coal chemical plant is studied. Furthermore, this study investigates the influence of pipe diameter, upstream straight pipe section and elbow angle on the maximum erosion wear rate. And suggestions for optimal pipeline layout are given. The results indicate that erosive wear primarily occurs on the inner wall of the outer side of the elbow, priority should be given to inspecting erosive wear in such areas. Pipe diameter has the greatest influence on erosive wear, followed by elbow angle. Therefore, increasing pipe diameter should be prioritized first, followed by reducing elbow angle to optimize pipeline layout.

Key words: petrochemical plants, pipe, erosive wear, optimized design, safety hazards