- 期刊
煉沒廠裂解單元的腐蝕問題及防制
Corrosion problem and prevention of cracking unit in refinery
摘要
煉油工業中的重要製程之一是將重油(heavy oil)轉化成高經濟效益的輕油(light oil)。由於製程中含有硫化氫，氰化物等腐蝕因子，對設備的安全性是一嚴苛的威脅。本研究以現場實際發生的案例爲主要討論點，由破損原因診斷分析到防蝕對策的提出，均有一系列報告。根據分析結果顯示，造成第二冷卻器破損的主要原因是停爐期間過多的硫酸基生成造成的酸性腐蝕及流體沖蝕。有效的解決對策包括(1)緩衝板施以熔射處理，以避免流體直接對冷卻管沖蝕(2)添加水洗設備，以免腐蝕因子的濃縮效益(condensation)造成嚴重腐蝕(3)增加中和胺劑量，有效調整系統pH值以保護冷卻器管束，並調整pH值在7.5～8.0之間。
並列摘要
It is the key unit in refinery to convert heavy oil into more valuable lighter products. Equipments in this unit are in the crucible of corrosive agents like hydrogen sulfide, chloride and cyanide. However, low pH value corrosion was the main cause for the performance failure in this case. In the period of emergency shut down, the formation of excess sulfuric acid includes the decreasing of pH value of overhead system. When acids are involved, the effect of flow velocity on erosion-corrosion problem is often pronouncedand extensive. Several strategies, including suitable surface treatment to protect the baffle, using water wash to cancel the concentration of corrosive agents and injecting enough neutralizer to control pH valuein the range of 7.5～8.0 of overhead system, are suggested to minimize the corrosion problem.
延伸閱讀
- 賴煒升（2020）。壓水式反應器二次側結構組件腐蝕劣化的防蝕研究〔碩士論文，國立清華大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0016-2502202114234671
- 徐一仁、李綺芳、林宗岳、李雅榮、李岳聯（2020）。腐蝕鋼板機械性質衰減模型研究：以實船及加速腐蝕鋼板分析。防蝕工程，34(4)，22-32。https://doi.org/10.6376/JCCE.202012_34(4).0003
- 徐一仁（2021）。腐蝕鋼板機械性質衰減模型研究：以實船及加速腐蝕鋼板分析〔碩士論文，國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU202104193
- 林思齊、余明昇、王重章（2003）。Initiation and Growth of Stress Corrosion Cracking on Inconel 600TT Alloy。防蝕工程，17(4)，383-390。https://doi.org/10.6376/JCCE.200312.0383
- 施建志、林葆喜（1992）。Corrosion Monitoring of Steel under Fireproofing Coating。防蝕工程，6(3)，25-31。https://doi.org/10.6376/JCCE.199209.0025