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Effect of trace zinc amounts introduced in various chemical structures in diesel fuel on coke deposits of fuel injectors of a CI engine
International Journal of Engine Research ( IF 2.5 ) Pub Date : 2018-05-28 , DOI: 10.1177/1468087418777175
Zbigniew Stepien 1 , Wojciech Krasodomski 1
Affiliation  

The goal of the article was to carry out a comparative research on the propensity of a standard-class commercial diesel fuel, consistent with the requirements of the EN-590 standard, with zinc catalysts of various chemical structures introduced, to form deposits on the tips of fuel injectors of a compression ignition engine. Studies on structures of zinc carboxylic salts type dissolved in the fuel and dispersed zinc oxides/hydroxides type were planned. The influence of zinc dialkyldithiophosphates (ZDDP) on the deposit formation was not investigated because of their complex structure and inability to evaluate the additional impact of phosphates(V) on the deposit formation process. Studies of pre-prepared fuel samples without zinc and with various zinc contents of various origins, which may constitute trace impurities of diesel fuel, were carried out using a standardised engine test acc. to the general European CEC F-98-08 procedure, in which the amount of the engine power decrease was adopted as an evaluation criterion for the size of the deposits formed on the tips of fuel injectors. Also, an analysis of elemental composition of the coke deposits formed on the tips of fuel injectors of a Peugeot DW10B engine was carried out by the X-ray fluorescence method. In the results of the studies carried out, it was found that in the case of commercial diesel fuel used for the tests, none of the zinc compounds assumed as deposits precursors had a significant influence on the chemistry of the deposit formation process during combustion of the diesel fuel in the engine. The deposits being formed are characterised by practically the same chemical nature. However, differences were found in the case of amounts of deposits forming on the tips of the fuel injectors and their growth rate during the test.

中文翻译:

柴油中各种化学结构中引入的微量锌对 CI 发动机喷油嘴积炭的影响

这篇文章的目的是对符合 EN-590 标准要求的标准级商用柴油燃料的倾向进行比较研究,引入各种化学结构的锌催化剂,在尖端形成沉积物压燃式发动机的燃料喷射器。计划研究溶解在燃料中的锌羧酸盐类型和分散的氧化锌/氢氧化物类型的结构。没有研究二烷基二硫代磷酸锌 (ZDDP) 对沉积物形成的影响,因为它们的结构复杂且无法评估磷酸盐 (V) 对沉积物形成过程的额外影响。研究不含锌和各种来源的各种锌含量的预制燃料样品,这些锌含量可能构成柴油的微量杂质,使用标准化的发动机测试进行。参照欧洲 CEC F-98-08 通用程序,其中采用发动机功率降低量作为燃料喷射器尖端形成的沉积物大小的评估标准。此外,还通过 X 射线荧光法对标致 DW10B 发动机燃料喷射器尖端形成的焦炭沉积物的元素组成进行了分析。在进行的研究结果中发现,在用于测试的商业柴油燃料的情况下,假定为沉积物前体的锌化合物中没有一种对燃烧过程中沉积物形成过程的化学产生显着影响。发动机中的柴油。正在形成的沉积物具有几乎相同的化学性质。然而,
更新日期:2018-05-28
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