Diesel fuel and a method of operating a diesel engine
AssigneeShell Oil Company
InventorsRalph Anthony Cherrillo, Richard Hugh Clark, Mary Ann Dahlstrom, Ian Geoffrey Virrels
Life of this patent
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Abstract
A diesel fuel based on a blend of a diesel fuel derived from a Fischer-Tropsch process, and a mineral oil based diesel fuel having a sulfur content of less than 100 ppmw; and a method of operating a diesel engine, which method involves combusting such diesel fuel in the diesel engine.
Claims39
A method of operating a heavy duty diesel engine, that provides relative reduction to the emission of oxides of nitrogen caused by the operation of the heavy duty diesel engine, the method comprising:
- (a) providing to the combustion chamber of the heavy duty diesel engine a diesel fuel comprising a blend consisting of (i) a diesel fuel derived from a Fischer-Tropsch process;
- and (ii) a mineral oil based diesel fuel having an aromatic content of less than 30% w, a sulfur content of less than 100 ppmw, and a T90 of more than 261° C., wherein the weight fraction of component (i) in the blend is between 0.28 and 0.5;
- (b) combusting said diesel fuel in said heavy duty diesel engine;
- (c) producing an emission of oxides of nitrogen from said combustion which is P % lower than an emission of oxides of nitrogen which can be calculated on the basis of a linear blending behavior of components (i) and (ii), P is relative to the emission of oxides of nitrogen caused by the said mineral oil based diesel fuel, and P is defined by the equation
- P=A·X·(1−X),
- in which equation A is a number in the range of from 10 to 25, and X is the weight fraction of component (i) in the blend, expressed as a number in the range of from 0 to 1.
A method of operating a diesel engine, which method comprises:
- (a) combusting in the diesel engine a diesel fuel comprising a blend consisting essentially of:
- (i) a diesel fuel derived from a Fischer-Tropsch process;
- and
- (ii) a mineral oil based diesel fuel having a sulfur content of less than 100 ppmw and an aromatic content of less than 30% w;
- wherein the weight fraction of component (i) in the blend is between 0.28 and 0.5;
- and,
- (b) producing an emission of oxides of nitrogen which is lower than an emission of oxides of nitrogen which can be calculated on the basis of a linear blending behavior of components (i) and (ii).
A method of operating a diesel engine, which method comprises:
- (a) combusting in the diesel engine a diesel fuel comprising a blend consisting essentially of
- (i) a diesel fuel derived from a Fischer-Tropsch process;
- and
- (ii) a mineral oil based diesel fuel having a sulfur content of less than 100 ppmw and an aromatic content of less than 30% w, wherein the weight fraction of component (i) in the blend is between 0.28 and 0.5;
- (b) producing an emission of oxides of nitrogen which is P % lower than an emission of oxides of nitrogen which can be calculated on the basis of a linear blending behavior of components (a) and (b), P is relative to the emission of oxides of nitrogen caused by the said mineral oil based diesel fuel, and P is defined by the equation
- P=A·X·(1−X),
- in which equation A is a number in the range of from 10 to 25, and X is the weight fraction of component (i) in the blend, expressed as a number in the range of from 0 to 1.
A method of reducing the emission of oxides of nitrogen caused by diesel engine powered vehicles participating in traffic, which method comprises
- (a) providing a diesel fuel comprising a blend consisting essentially of
- (i) a diesel fuel derived from a Fischer-Tropsch process;
- and
- (ii) a mineral oil based diesel fuel having a sulfur content of less than 100 ppmw and an aromatic content of less than 30% w,
- wherein the weight fraction of component (i) in the blend is between 0.28 and 0.5, and
- (b) combusting the diesel fuel in the diesel engines of at least 50 vehicles of the vehicles participating in said traffic;
- (c) producing an emission of oxides of nitrogen which is lower than an emission of oxides of nitrogen which can be calculated on the basis of a linear blending behavior of components (i) and (ii).
Dependencies are inferred from the claim text.