Lubricating Composition Using Base Oil Blend for Two-Stroke Diesel Engines
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Solution Overview
Problem
The availability of bright stock oil, commonly used in lubricating compositions for two-stroke crosshead diesel engines, is constrained, and existing blends with de-asphalted cylinder oil do not fully reduce deposit formation.
Innovation Solution
A lubricating composition comprising a base oil blend of at least 98% Group I and Group II base oils with de-asphalted cylinder oil, replacing bright stock oil, which maintains advantageous viscometric properties and reduces deposit formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bright stock oil is used in lubricating compositions for two-stroke crosshead engines, then the lubricating properties are maintained, but the availability of base oil is constrained and deposit formation occurs
Solution Approach 1:
The patent applies composite materials by creating a base oil blend combining Group I base oil (with specific viscosity <20 mm²/s at 100°C) and Group II base oil (with viscosity >12 mm²/s at 100°C). This composite blend replaces bright stock oil while maintaining lubricating properties through the synergistic combination of different base oil types, each contributing complementary characteristics to the final lubricating composition
Solution Approach 2:
The patent applies parameter changes by specifying precise viscosity parameters for the base oil components: Group I base oil with kinematic viscosity at 100°C of less than 20 mm²/s and Group II base oil with kinematic viscosity at 100°C of more than 12 mm²/s. By controlling these viscosity parameters, the invention maintains appropriate lubricating film properties while using alternative base oils with different chemical compositions
2Stability of the object's composition
If de-asphalted cylinder oil is blended with bright stock oil, then viscometric properties are improved, but deposit formation is not sufficiently reduced
Solution Approach 1:
The patent applies the extraction principle by removing bright stock oil from the lubricating composition and replacing it with a blend of Group I and Group II base oils. This extraction eliminates the deposit-forming components of bright stock oil while maintaining necessary viscometric properties through the selected base oil combination and de-asphalted cylinder oil
Solution Approach 2:
The patent applies parameter changes by de-asphalting cylinder oil to modify its compositional parameters, removing asphaltic components that contribute to deposit formation. The de-asphalted cylinder oil is then blended with controlled viscosity Group I and Group II base oils to achieve the desired viscometric properties without the harmful deposit-forming characteristics of the original cylinder oil
Data Source
AI summary
The present invention provides a lubricating composition suitable for use in a two-stroke crosshead diesel engine. The lubricating composition comprises a base oil blend consisting of base oil chosen from Group I, base oil chosen from Group II and deasphalted cylinder oil.