Steam turbine lubricating oil composition

Abstract

The invention relates to a steam turbine lubricating oil composition which comprises the following components: 0.03-1.5 wt% of an anti-oxidant; 0.03-0.2 wt% of an antirust agent, 0.001-0.1 wt% of an anti-foaming agent, 0.03-1 wt% of an antiwear agent, 1-20 wt% of polyol ester, and balance base oil, wherein the anti-oxidant is alkyl diphenylamine and/or alkyl phenyl-alpha-naphthylamine; the antirust agent is a complex mixture of carboxylic acid derivatives and imidazoline derivatives; the anti-foaming agent is polymethacrylate or methyl siloxane; the antiwear agent is a compound containing sulfur, phosphor, and nitrogen; the polyol ester is pentaerythritol ester or diol ester; and the base oil is II type or III type base oil with the saturated hydrocarbon content more than 90% and the sulfur content less than 0.03%. The steam turbine lubricating oil composition has the advantages of the excellent high temperature resistance and antioxidation performances, tiny greasy filth generation trend, excellent extreme pressure performance, antirust performance, hydrodissection performance, air separation performance, filterability and extreme low acid value.

Description

technical field [0001] The invention relates to a lubricating oil composition with extremely low sludge formation tendency, excellent high-temperature oxidation stability and anti-wear extreme pressure performance, which is especially suitable for the lubrication of gas-steam combined cycle units and gas turbines with gear connection. Background technique [0002] A turbine is a device used to generate electrical or mechanical work through the rotational motion of a shaft. In any combination, gas and steam turbines use the flow of hot combustion gases or steam to generate energy in the form of thrust and / or shaft power. For example, air flowing into a gas turbine is compressed in an air compressor and fed at high temperature and pressure into a combustor where fuel injection creates a fuel / compressed air mixture that ignites. The rapidly expanding gases resulting from this ignition exit the combustion chamber at high velocity, pass over the turbine blades and thus cause the...

AI Technical Summary

Problems solved by technology

Antioxidants still use the compound of aromatic amine and hindered phenol, because hindered phenol is easy to volatilize at high temperature, its high temperature anti-oxidation life is short

Moreover, the composition has no anti-wear agent, and its extreme pressure anti-wear performance is very poor

Therefore, the composition also cannot meet the lubrication requirements of gas turbines and large gas-steam combined cycle units

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