Khan Rehan, Ya Hamdan H, Pao William, Khan Armaghan
Mechanical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Perak 32610, Malaysia.
Department of Mechanical Engineering, McGill University, Macdonald Engineering Building, 817 Sherbrooke Street West Montreal, Montreal, QC H3A 0C3, Canada.
Materials (Basel). 2019 Nov 26;12(23):3898. doi: 10.3390/ma12233898.
Erosion-corrosion in flow changing devices as a result of sand transportation is a serious concern in the hydrocarbon and mineral processing industry. In this work, the flow accelerated erosion-corrosion mechanism of 90°, 60°, and 30° long radius horizontal-horizontal (H-H) carbon steel elbows with an inner diameter of 50.8 mm were investigated in an experimental closed-flow loop. For these geometrical configurations, erosion-corrosion was elucidated for erosive slug flow regimes and the extent of material degradation is reported in detail. Qualitative techniques such as multilayer paint modeling and microscopic surface imaging were used to scrutinize the flow accelerated erosion-corrosion mechanism. The 3D roughness characterization of the surface indicates that maximum roughness appears in downstream adjacent to the outlet of the 90° elbow. Microscopic surface imaging of eroded elbow surfaces disseminates the presence of corrosion pits on the exit regions of the 90° and 60° elbows, but erosion scars were formed on the entry regions of the 30° elbow. Surface characterization and mass loss results indicated that changing the elbow geometrical configuration from a small angle to wide angle significantly changed the mechanical wear mechanism of the tested elbows. Moreover, the maximum erosive location was identified at the top of the horizontally-oriented elbow for slug flow.
在烃类和矿物加工行业中，由于砂粒输送导致的流动变化装置中的冲蚀腐蚀是一个严重问题。在这项工作中，在内径为50.8毫米的90°、60°和30°长半径水平-水平（H-H）碳钢弯管的流动加速冲蚀腐蚀机制在一个实验性封闭流动回路中进行了研究。对于这些几何构型，阐明了侵蚀性弹状流态下的冲蚀腐蚀情况，并详细报告了材料降解程度。采用多层涂料建模和微观表面成像等定性技术来研究流动加速冲蚀腐蚀机制。表面的三维粗糙度表征表明，最大粗糙度出现在90°弯管出口下游附近。对侵蚀后的弯管表面进行微观表面成像，发现90°和60°弯管出口区域存在腐蚀坑，但30°弯管入口区域形成了侵蚀疤痕。表面表征和质量损失结果表明，将弯管几何构型从小角度改为大角度会显著改变测试弯管的机械磨损机制。此外，对于弹状流，确定最大侵蚀位置在水平弯管的顶部。
