Abstract
The article considers the current methods of calculating norms of lubricating oil consumption by marine diesels that provide for three causes of oil loss: oil burning, evaporation rate, and replacement expense. According to the manual, the lubricating oil consumption for replacement is considered only in trunk diesel engines; in main crosshead diesel engines with capacity over 3000 kW it is not considered and not performed. The lubricating oil consumption norms are proposed to carry out in terms of burnout and evaporation, according to the methods of determining fuel consumption norms. To determine consumption norms, it is necessary to know the oil consumption characteristic in relation to the load of the diesels and the load distribution in the ship operating mode. In the low speed crosshead diesel engines the circulating oil is only consumed for evaporation, but the trunk diesel engines consume oil for evaporation, burnout and replacement. The diagram of dependence of the relative cylinder oil consumption on the relative load of the diesel engine in the helical characteristic mode is illustrated. A simplified technological scheme of low-tonnage regeneration of the used motor oils is presented. It is proposed to calculate the oil consumption by the lubrication pump according to a nonlinear dependence based on the speed of the crankshaft at a specific mode. The analysis of the evaporation and burnout is recommended to carry out using a linear relationship, subject to oil consumption in the idle mode. The cost of circulating oil replacement is recommended to calculate according to the diesel operating time. Application of the used lubricating oil regeneration by means of a ship small-sized plant allows to achieve the oil consumption reduction by 19-48% depending on the ship operating mo
Highlights
The article considers the current methods of calculating norms of lubricating oil consumption by marine diesels that provide for three causes of oil loss: oil burning, evaporation rate, and replacement expense
In the low speed crosshead diesel engines the circulating oil is only consumed for evaporation, but the trunk diesel engines consume oil for evaporation, burnout and replacement
It is proposed to calculate the oil consumption by the lubrication pump according to a nonlinear dependence based on the speed of the crankshaft at a specific mode
Summary
Дальневосточный государственный технический рыбохозяйственный университет, Владивосток, Российская Федерация. Проиллюстрирован график зависимости относительного расхода цилиндрового масла от относительной нагрузки дизеля на режиме винтовой характеристики. 1. Зависимость относительного расхода цилиндрового масла от относительной нагрузки дизеля на режиме винтовой характеристики. Где gм – удельный эффективный расход цилиндрового масла на номинальной мощности. Тогда с учетом выражения (2) формула для определения расхода циркуляционного масла на угар и испарение по отношению к режиму номинальной мощности ( ) = 1,1 ⋅ 10−3 ⋅ 6 615 0,332 +1,123 ⋅ 0,31− 0,575 ⋅ 0,312 − 0,575 ⋅ 0, 232 = 4,33 кг/ч, где gм = 1,1 · 10–3 – удельный эффективный расход цилиндрового масла, кг/(кВт·ч); Nе ном = 6 615 – номинальная мощность, кВт. Расчет расхода масла на угар и испарение производится с учетом нагрузки каждого ВДГ и режима эксплуатации судна. Величины этих расходов для разных режимов представлены в табл. 1, а нормы расхода смазочных масел судовой дизельной установки (СДУ) приведены в табл. 2
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