我国是原油进口第一大国，大量炼制低价腐蚀性劣质原油，石化行业的加氢空冷系统因流动腐蚀引发的安全问题极为突出。大量失效案例表明：空冷管束内多元流体输运过程涉及组分传递、相变、界面产生及运动等复杂物理过程以及化学反应产生，易结晶相的结晶及其漂移沉积是引起管壁减薄、泄漏、爆管等失效的主要原因。因结晶相漂移沉积机理不明确，现有研究成果无法定量描述与之对应的管壁损伤规律，致使加氢空冷系统始终处于高风险服役状态。.本项目拟以加氢空冷系统为研究对象，从理论分析、数值模拟和实验研究等方面对多元流体结晶相的漂移沉积动力学特性开展深入研究，掌握流动腐蚀环境下多元流体易结晶相的结晶规律，揭示流-热耦合作用结晶相的漂移沉积机理，形成结晶相漂移沉积特性的量化表征预测方法，建立结晶相漂移沉积与管壁损伤失效的内在关联，制定以漂移沉积特性主动防控为目标的技术标准，为大型空冷系统的优化运行和风险预警提供理论支撑。

China is the biggest importer of crude oil, and a large number of low-priced inferior oil with strong corrosiveness is processed. The safety problem of the hydrogenated air cooling system induced by flow-induced corrosion is very prominent in petrochemical industry. In the air cooling system tube bundle, the conveying process of multiple multiphase fluid relates to complex physical processes and chemical reaction, such as component transfer, phase transition, interface generation and motion. A great deal of failure cases show that the crystallization and drifting deposition of corrosive crystalline phase is the main cause of many flow-induced corrosion failures: tube wall thinning, leakage and pipe burst, for example. Due to the unclear drifting deposition mechanism of crystalline phase, present research results cannot quantitatively describe the corresponding rule in wall damage, which makes the hydrogenated air cooling system be always in high-risk service status..Taking hydrogenated air cooling system as the research object, the project intends to deeply explore the dynamic characteristics for drifting deposition of multi fluid crystalline phase via the theoretical analysis, numerical simulation and experimental study. The primary goal is to master the crystallization rule of multiphase fluid in the flow-induced corrosion environment, and to reveal the drift and deposition mechanism of crystalline phase under fluid-thermal coupling, and to create a quantitative characterization and prediction method for the drifting deposition characteristics of crystalline phase. Then, the final goal is to reveal the internal relationship between the drifting deposition of the crystalline phase and the damage of the tube wall, and to formulate the technical standard for the active prevention and control of drifting deposition characteristics, so as to provide theoretical support for the optimal operation and risk warning of the large-scale air cooling system.