| QU Ding-rong.Phenomenon and Research Progress of Naphthenic Acid Corrosion in Refinery[J],45(7):115-121 |
| Phenomenon and Research Progress of Naphthenic Acid Corrosion in Refinery |
| Received:March 23, 2016 Revised:July 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.07.020 |
| KeyWord:naphthenic acid naphthenic acid corrosion sulfidation corrosion high temperature corrosion operational limits corrosion prediction model crude oil refining equipment asset integrity management |
| Author | Institution |
| QU Ding-rong |
SINOPEC Research Institute of Safety Engineering, Qingdao , China |
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| Abstract: |
| Industry experience of processing high Total Acid Number (TAN) crude oil was reviewed. Purchasing and processing crude oil with high TAN is an important means to improve the profit for refinery; however, the crude oil refining unit also suffers from severe naphthenic acid corrosion (NAC). NAC usually happens at the high temperature parts above 230 ℃, internal parts of vacuum distillation tower and flow components. Many effective methods have been applied to improve the performance of refining units against NAC. The methods include improving corrosive adaptability of units, material upgrading, on-line corrosion monitoring, high temperature corrosion inhibitor and so on. However, the risk of corrosion of the equipment has not been completely controlled. Non-planned unit shutdown still occurs occasionally due to the serious corrosion. Therefore, research on high temperature NAC has been continuously carried out for decades. Experimental results of simulated medium revealed effects of temperature, TAN and sulfur content on NAC, and indicated sulfidation corrosion (SC) can partially inhibit NAC. In recent years, the research interest has been gradually turned to the NAC in the real fraction, and the synergistic effect of NAC and SC, focusing on the inhibition effect of sulfur corrosion product film against NAC. Many new experimental devices have been developed, such as the rotating ring, the impingement device, flow-through mini autoclave, and high speed dual phase flow simulation device. These devices simulate operating conditions in the real field from different points of view. Challenge (pretreat-corrosion) experiments have been developed to study the behavior and characteristics of passive film in high-temperature NAC environment. The distribution of naphthenic acid in the real fraction has also been widely studied. The corrosion prediction model has been developed and used as the basis for a variety of refinery equipment integrity management technologies. |
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