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End of Life Tires as a Possible Source of Toxic Substances Emission in the Process of Combustion

机译：报废轮胎可能是燃烧过程中有毒物质排放的可能来源

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Several million tons of end of life tires (ELTs) are piled annually as a result of human activities. Various methods have been proposed for the extraction and recycling of the resource potential of ELTs. The chemical composition of ELTs seems to enable their usage as a fuel after mechanical separation of a steel cord. Indeed, in the rubber of ELTs, up to 90 mass% accounts for carbon and hydrogen. Currently, it is by incineration that a significant proportion of ELTs is utilized. However, ELTs contain not only sulfur, which is used for vulcanization, but also nitrogen-containing additives. The behavior of these heteroatoms during oxidation is poorly investigated. It has been shown that the pyrolysis liquid fuel obtained from ELTs contains such sulfur compounds as mercaptans and nitrogen in the form of hydrocyanic acid and cyanogen. Deep oxidation of ELTs results in the oxidation of sulfur compounds to dioxide, but the oxidation products have been found to contain traces of cyanogen. Taking this into account, one should pay attention to the ways of transforming heteroatoms during the process of ELT oxidation and the products of ELT pyrolysis as potential sources of highly toxic gas emissions.
机译：每年由于人类活动而堆积数百万吨的废旧轮胎（ELT）。已经提出了各种方法来提取和回收ELT的资源潜力。 ELT的化学成分似乎可以在机械分离钢丝帘线后用作燃料。实际上，在ELT的橡胶中，高达90质量％的碳和氢。当前，通过焚烧利用了很大比例的ELT。但是，ELT不仅包含用于硫化的硫，还包含含氮的添加剂。这些杂原子在氧化过程中的行为研究很少。已经显示，从ELT获得的热解液体燃料包含氢氰酸和氰化物形式的硫化合物如硫醇和氮。 ELT的深度氧化会导致硫化合物氧化为二氧化碳，但已发现氧化产物中含有微量的氰。考虑到这一点，应该注意ELT氧化过程中转化杂原子的方式以及ELT热解产物作为高毒性气体排放的潜在来源。

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