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頁籤選單縮合
題 名 | 煉製工場去丁烷塔頂腐蝕防治研究=Corrosion Problem and Prevention of Debutanizer Overhead System in Refinery Unit |
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作 者 | 王逸萍; 張行 ; 何奇律; 連文良; 湯順雄; 黃榮村; | 書刊名 | 石油季刊 |
卷 期 | 35:3 1999.09[民88.09] |
頁 次 | 頁65-74 |
分類號 | 466.8 |
關鍵詞 | 去丁烷塔頂; 酸性腐蝕; 有機酸; 中和胺; 防蝕劑; 水洗; Debutanizer overhead; Acid corrosion; Organic acids; Neutralizing amine; Inhibitor; Water wash; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究主要在探討近兩三年來某煉製工場在去丁烷塔頂系統空氣冷卻器E-1時常 破損之因及其防治方法。一般而言,分餾塔頂系統可能產生腐蝕的原因,包括鹽酸腐蝕、 鹽類沉積腐蝕(underdepostitcorrosion)、濕式硫化氫腐蝕及沖蝕等問題,而實際破損的 原因則因進料油成份不同而有所差異。在本研究的案例中,其破損原因雖為極為常見的酸 性腐蝕,但其腐蝕源卻是文獻上較少提及的有機酸。造成此問題的主要原因是進料油中夾 帶過多的醋酸,促使塔頂系統之pH值偏低(pH~4.0)引起酸性腐蝕,期間雖添加中和胺控制 系統之pH值,但因未考量防蝕劑於輕質油料中的溶解度,以致系統不僅因防蝕劑中有效成 份沉澱而生成黑色疑膠物使得熱交換管堵塞外,更因防蝕劑分散不均無法全面保護管壁, 而導致熱交換管再度破損。針對此問題,可採取之防治對策,除可添加適量中和胺控制系 統之pH值於6.5~7.5之間,並就輕質油料中溶解度之考量選擇適當的防蝕劑外,更可於塔 頂系統實施水洗作業,將可使腐蝕問題降至最低。 |
英文摘要 | The objective of this research is to study the failure reasons and preventive methods for debutanizer overhead air cooler in refinery. The possible corrosion mechanism in overhead system includes hydrogen chloride acid corrosion, salt deposit corrosion, wet hydrogen sulfide cracking and erosion-corrosion. Overhead system failure is very dependent on feed sources. In this study, acid corrosion is the main reason for this case and the source of acid corrosion comes from organic acids. The amount of acetic acid in feed was too high and reduced the pH value (pH ~ 4.0) of the overhead system. Neutralizing amine was added to control pH value. Corrosion inhibitor was applied to provide tube protection. However, inhibitor caused the following problems, most corrosion inhibitor polymerized to form black. gel and caused heat exchanger to block up. The black localized gel could not provide good protection for tube but induced localized corrosion. After further studying, we find the main reason is neglecting the solubility of the corrosion inhibitor. Process stream is very light hydrocarbon in this case. If the solubility of inhibitor could not compatible with light process stream, inhibitor would loss its performance and caused negative effect for the system. The effective solutions are to choose suitable corrosion inhibitor and to control the pH value of the system by adding neutralizing amine. If water wash of overhead system is applied, the corrosion rate will be effectively reduced and controlled. |
本系統中英文摘要資訊取自各篇刊載內容。