Surface Deposition within Treated and Untreated Stainless Steel Tubes Resulting from Thermal-Oxidative and Pyrolytic Degradation of Jet Fuel

详细信息    查看全文

• 作者：Jamie S. Ervin ; Thomas A. Ward ; Theodore F. Williams ; and Jarrod Bento
• 刊名：Energy & Fuels
• 出版年：2003
• 出版时间：May 2003
• 年：2003
• 卷：17
• 期：3
• 页码：577 - 586
• 全文大小：460K
• 年卷期：v.17,no.3(May 2003)
• ISSN：1520-5029

文摘

Flow experiments using heated Jet-A fuel and additives were performed to study the effects oftreated surfaces on surface deposition. The experimental apparatus was designed to viewdeposition due to both thermal oxidative and pyrolytic degradation of the fuel. Carbon burnoffand scanning electron microscopy were used to examine the deposits. To understand the effectof fuel temperature on surface deposition, computational fluid dynamics was used to calculatethe two-dimensional temperature profile within the tube. Three kinds of experiments wereperformed. In the first kind, the dissolved O₂ consumption of heated fuel is measured on differentsurface types over a range of temperatures. It is found that use of treated tubes significantlydelays oxidation of the fuel. In the second kind, the treated length of tubing is progressivelyincreased which varies the characteristics of the thermal-oxidative deposits formed. In the thirdtype of experiment, pyrolytic surface deposition in either fully treated or untreated tubes is studied.It is found that the treated surface significantly reduced the formation of surface deposits forboth thermal oxidative and pyrolytic degradation mechanisms. Moreover, it was found that thechemical reactions resulting in pyrolytic deposition on the untreated surface are more sensitiveto pressure level than those causing pyrolytic deposition on the treated surface.