Geohìm. tehnog. (2019) 2 (30) :84 — 89
Kiselov Yu., Arkhypenko О., Stokolos М., Zhebrovska К.
Detonation resistance of gasoline is estimated by octane numbers, which are determined on special motor units. Methods for determining octane numbers are standardized and are used in the certification of gasoline, in arbitration and other cases. However, they are time consuming and expensive. Therefore, a large number of express methods have been created for research purposes. These methods are based on the determination of physical parameters of gasoline correlating with their detonation resistance. Until recently, the methods were used rather extensively and worked well, but the complexity of the composition of modern gasoline hinders their use. In addition, the effect of the introduction of anti-knock additives into gasoline often goes unnoticed. The article describes the principle and method of assessing the detonation resistance of gasoline on the basis of studying the processes of their pre-flame transformations. A reactor was developed in which the conditions necessary for the occurrence of a cold-flame oxidation reaction were created, and with its help a number of studies of the most common anti-knock additives have been carried out. The experimental embodiment of the device OK-2M has been designed and put into operation, the block diagram of which is published in the article. The dependences of the detonation resistance of gasoline on the temperature and time of their cold-flame oxidation reactions are determined. As an example, graphic images obtained for gasoline with different octane numbers of engine and octane research numbers are given. This article provides experimental data and technical capabilities of the developed method and device for evaluating the detonation resistance of commercial gasoline. Methods for determining the detonation resistance of fuels by the parameters of the reaction of oxidation of hydrocarbons are substantiated and selected. The results are confirmed by research using arbitration methods. Unlike other rapid methods, the described method allows to evaluate the detonation properties of fuels manufactured using anti-knock agents.
Key words: detonation resistance, octane number, pre-flame transformation.
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