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Can one say ethanol is a real threat to gasoline?

机译：有人可以说乙醇是对汽油的真正威胁吗？

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摘要

Ethanol use in Brazil as a motor fuel has been largely promoted since the two oil shocks of the 1970s, either as a gasoline additive (anhydrous ethanol) or as a gasoline substitute (hydrated ethanol). As of today, the uncertainties in the international oil markets, the methyl tertiary butyl ether (MTBE) ban in the US and the growing concerns with global climate change, all justify the quest for a new role to be played by ethanol worldwide. The current prevailing view sees ethanol as a real threat to gasoline and, eventually, to oil itself. This paper examines this issue and concludes that by replacing mainly MTBE and not allowing the use of improved Otto engines, E10 (gasohol blend) does not pose any serious treat to the oil industry, nor do flexfuel vehicles using fairly typical gasoline engines and, in the lack of ethanol supply, running on gasoline. On the other hand, if Otto engines at compression ratios found in diesel engines are promoted, then E30 could become a suitable strategy for spreading the use of ethanol fuel in large volumes and also for saving gasoline. This paper proposes coupling policies of blending ethanol with gasoline, with policies aiming at saving fuel use in light duty vehicles (LDV).
机译：自从1970年代两次石油危机以来，作为汽油添加剂（无水乙醇）或汽油替代品（水合乙醇），在巴西使用乙醇作为汽车燃料已得到了极大的促进。截至今天，国际石油市场的不确定性，美国对甲基叔丁基醚（MTBE）的禁令以及对全球气候变化的日益担忧，都证明了在全球范围内寻求乙醇发挥新作用的理由。当前流行的观点认为，乙醇是对汽油乃至石油本身的真正威胁。本文研究了这个问题，得出的结论是，通过主要替换MTBE并不允许使用改进的Otto发动机，E10（混合汽油）不会对石油行业产生任何严重的影响，使用柔性燃料汽车也不会使用相当典型的汽油发动机，并且乙醇供应不足，靠汽油运行。另一方面，如果提倡使用柴油发动机中具有压缩比的奥托发动机，那么E30可能成为扩大乙醇燃料使用量并节省汽油的合适策略。本文提出了将乙醇与汽油混合的耦合策略，旨在节省轻型车辆（LDV）的燃料使用。

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