Fuel Composition Blending Fischer-Tropsch Base Oil for Power
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Solution Overview
Problem
Conventional high viscosity fuels increase fuel density, leading to detrimental smoke emissions, while attempts to enhance power performance through viscosity increase are limited by diesel fuel specifications and result in emissions degradation.
Innovation Solution
A fuel composition blending petroleum-derived low sulfur diesel with Fischer-Tropsch derived gasoil and base oil, maintaining power performance without increasing fuel density, achieved by using a specific ratio of Fischer-Tropsch derived components that break the density-viscosity correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high viscosity components are blended into conventional diesel to increase power performance, then viscosity increases and power performance improves, but fuel density increases leading to increased smoke emissions
Solution Approach 1:
The patent changes the density parameter of the viscosity-increasing component by selecting Fischer-Tropsch derived base oil with density <0.845 g/cm³, breaking the conventional density-viscosity correlation and allowing viscosity increase without the usual density increase that causes smoke emissions
Solution Approach 2:
The patent uses a composite blending approach combining three components: conventional diesel (30-70%), Fischer-Tropsch gasoil (10-30%), and Fischer-Tropsch base oil (10-30%), where the unique properties of each component complement each other to achieve high viscosity with controlled density
2Power
If viscosity increasing components are added to enhance power performance, then injection process improves and tractive effort increases, but fuel density increases reducing air/fuel ratio
Solution Approach 1:
The patent changes the density parameter of the blending component to decouple the density-viscosity relationship, enabling viscosity increase (which improves injection and tractive effort) without the proportional density increase that would reduce air/fuel ratio
3Power
If high viscosity fuel formulations are developed to improve power performance, then injection volume increases, but compliance with diesel fuel specifications becomes difficult
Solution Approach 1:
The patent selects Fischer-Tropsch base oil with specific parameters (density <0.845 g/cm³, viscosity 2-10 cSt at 40°C) that allow achieving high power performance while maintaining compliance with EN 590 specification limits for density and other fuel properties
Solution Approach 2:
The patent optimizes the local properties of each blending component, using Fischer-Tropsch gasoil to provide aromatic content control and Fischer-Tropsch base oil to provide viscosity enhancement with low density, allowing tailored formulation that meets multiple specification requirements
Data Source
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AI summary
The present invention relates to fuel composition prepared by blending a petroleum derived low sulphur diesel comprising <50 ppm of sulphur with a Fischer- Tropsch derived gasoil and a Fischer-Tropsch derived base oil wherein the amount of the petroleum derived low sulphur diesel is from 60% up to 80% v/v of the total composition; the amount of Fischer-Tropsch derived gasoil is from 10% up to 30% v/v of the total composition; the amount of Fischer-Tropsch derived base oil is from 10% up to 30% v/v of the total composition; the amounts of the Fischer-Tropsch derived gas oil and Fischer-Tropsch derived base oil together being at least 20% v/v of the total composition; and wherein the petroleum derived low sulphur diesel has a density of 0.81 to 0.865 g/cm3 at 15°C and a kinematic viscosity (ASTM D445) from 1.5 to 4.5 mm2/s at 40°C; the Fischer-Tropsch derived gasoil has a density of 0.76 to 0.80 g/cm3 at 15°C and a kinematic viscosity (ASTM D445) from 2.0 to 4.5 mm2/s at 40°C; the Fischer-Tropsch derived base oil has a density of 0.79 to 0.82 g/cm3 at 15°C and a kinematic viscosity (ASTM D445) from 7.5 to 12.0 mm2/s at 40°C; and wherein the composition has increased power performance in a diesel injection engine when compared to fuel compositions comprising only a petroleum derived low sulphur diesel comprising <50 ppm of sulphur and a Fischer-Tropsch derived gasoil. The fuel compositions of the invention have improved properties, in terms that they display increased power when compared to fuel compositions in which the Fischer- Tropsch derived base oil component is not present.