文献类型：期刊文献

英文题名：Numerical investigation of liquid-solid erosion behavior in the continuous slag discharge system of a high-pressure gasifier

作者：Yang, Guangrun[1];Zhao, Hui[1];Xu, Jianliang[1];Dai, Zhenghua[1,2];Liu, Haifeng[1,3]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Resource Utilizat Carbon Containing W, Minist Educ, Shanghai 200237, Peoples R China;[2]Xinjiang Univ, State Key Lab Chem & Utilizat Carbon Based Energy, Urumqi 830046, Peoples R China;[3]Liaoning Petrochem Univ, Fushun 113001, Liaoning, Peoples R China

年份：2026

卷号：321

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20254519461820);WOS:【SCI-EXPANDED(收录号:WOS:001613177200002)】；

基金：This research was supported by the Key Research and Development Program of Autonomous Region (2023B01013) .

语种：英文

外文关键词：Particle erosion; CFD; Liquid-solid flow; Multistage pressure-reducing pipes; Segmental orifice plate

摘要：The conventional lock-hopper systems, operating in batch mode, are a major source of operational instability and frequent downtime in coal gasification processes, leading to significant economic losses and reliability challenges. To overcome these limitations, this study proposes a novel multistage pressure-reducing structure designed to replace traditional lock-hopper configurations, enabling continuous slag discharge with a radically simplified design and significantly higher operational efficiency. Utilizing an integrated experimental and twoway coupled computational fluid dynamics (CFD) approach, the research systematically investigates the complex multiphase erosion mechanisms inherent in continuous slag handling. Key findings identify three critical erosion hotspots: the impact zone at the decompression chamber inlet, the rebound-circulation zone near the segment root, and the sharp edges of orifice openings. Particle behavior analysis reveals a three-stage process in the rebound-circulation zone-deceleration, quasi-stagnation, and secondary acceleration-which results in helical trajectories and repeated wall impact. The maximum erosion rate follows a cubic power-law relationship with flow rate, while larger particles, contrary to conventional wisdom, reduce overall erosion due to complex flow-structure interactions. These insights offer practical design strategies for developing erosion-resistant continuous slag discharge systems, ultimately enhancing the reliability and efficiency of coal gasification operations.