加氢装置空冷器出口管道多元水-盐体系的冲刷腐蚀特性

基于工艺关联过程及流体仿真模拟，分析了某石化企业加氢反应产物空冷器(REAC)系统出口管道中多元腐蚀流分布规律，建立了包含铵盐结晶温度、NH₄HS质量分数、最大壁面剪切应力、水相体积分数等参数的流动腐蚀表征预测体系，并通过测量腐蚀产物及腐蚀余量等来验证预测模型的准确性。结果表明：正常工况下，空冷器出口管道内无铵盐结晶风险，但存在冲蚀风险；水相中NH₄HS的质量分数为1.56%，且腐蚀产物中存在S元素；冲蚀高风险区主要集中在空冷器出口管的三通主管轴线方向110~135 mm和水平管轴线方向60~70 mm处；该位置与实际腐蚀减薄严重区域基本吻合，预测精度约为91.67%。

Erosion and Corrosion Characteristics of Multi-Element Water and Salt System in Hydrogenation Air-Cooled Outlet Pipelines

Based on the process analysis and numerical simulation, the distribution of the multi-element corrosion flow was analyzed in the outlet pipelines of the hydrogenation reactor effluent air coolers (REAC) of a petrochemical enterprise. The flow characterizations of the prediction system including crystallization temperature of ammonium salt, NH₄HS mass fraction, maximum wall shear stress and water phase fraction were established. The accuracy of the prediction model was checked by measuring corrosion products and corrosion allowance. The results indicate that there is no risk of ammonium salt crystallization in the outlet pipeline system under the normal working condition. However, there is a certain erosion risk in the outlet pipelines. The NH₄HS mass fraction is 1.56% in water phase, and sulfur element exists in the corrosion product. The high flow-induced corrosion region where locates in the 110-135 mm in the main axis direction of the tee and 60-70 mm in the axis direction of the horizontal pipe is specified. The high-risk region predicted by hydrodynamics parameters is line with the corrosion thinning area, and the prediction accuracy of erosion-corrosion is 9167%.