Lubricating oil composition

Abstract

The present invention provides a lubricating oil composition comprising at least one type of base oil selected from mineral oils and synthetic oils, and a succinate ester and a sarcosinic acid as rust prevention agents. The succinate ester content is preferably set at 0.01 to 0.1 wt. %, and the sarcosinic acid content is preferably set at 0.001 to 0.01 wt. %. Further, they are preferably set such that the resulting weight ratio of the succinate ester content and sarcosinic acid content is 1 : 0.01 to 0.7. The lubricating oil composition according to the present invention shows excellent rust prevention properties and a satisfactorily long oxidation lifetime. Further it allows to attain a high level of anti- sludge performance and extreme pressure performance and lubrication performance, even when it is used for example in turbine bearings in combined cycle generators having multiplier gears operated under severe high temperature and high pressure conditions.

Description

technical field [0001] This invention relates to lubricating oil compositions. Background technique [0002] In recent power plants, for efficient power generation and effective use of energy, utilization of gas turbines using high-temperature gas such as liquefied natural gas (LNG) or combined cycle power plants in which gas turbines and steam turbines are used in combination has gradually increased. In these power plants, as the gas temperature rises, the thermal load on the turbine oil used increases considerably. [0003] In addition, when blast furnace gas (BFG) is used for combined cycle power generation, since the combustion heat from BFG is low, the pressure of BFG needs to be greatly increased to improve power generation efficiency. For this purpose, the BFG is added to the gas turbine after compression in a gas compressor connected via a multiplier gear to a shaft system consisting of a gas turbine-generator-steam turbine. [0004] In this multiplier gear, the ga...

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Problems solved by technology

For this reason, it is difficult to obtain satisfactory thermal stability, oxidation stability and anti-oil performance in turbine bearings of combined cycle generators having the above-mentioned multiplier gears when using lubricating oils added with sulfur-based extreme pressure agents

[0008] On the other hand, although the use of phosphorus-based EP additives tends to create less oily fouling than the use of sulfur-based EP additives, it is difficult to achieve the high levels of extreme pressure required in the above-mentioned gear bearings if phosphorus-based EP additives are used alone. pressure performance

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