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Method and system for operating two-and four-stroke engines using low sulfur fuels

a two-and-four-stroke engine and low sulfur fuel technology, which is applied in the direction of machines/engines, mechanical equipment, and organic compounds of the group 3/13 element, can solve the problems of deterioration of other lubricants used on-board vessels or at stationary sites, affecting and not going beyond certain limits without jeopardizing the condition of oiled engine components

Inactive Publication Date: 2008-06-26
A P MOLLER AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides methods for operating two-stroke and four-stroke engines using low sulfur fuels. The methods involve blending base oil with at least one additive to produce blended oil with a specific TBN range. The engines are operated using the blended oil and low sulfur fuel. The blended oil can also be used with high sulfur fuel by switching the lubricating system of the engine. The technical effects include improved engine performance and reduced emissions with low sulfur fuels.

Problems solved by technology

The properties may not go beyond certain limits without jeopardizing the condition of the oiled engine component.
Similarly, other lubricants used on-board vessels or at stationary sites, such as hydraulic fluids, gear oils, turbine oils, heavy duty diesel oils, compressor oils and the like, do deteriorate over time, due to e.g. contamination, oxidation, hydrolysis etc. and therefore have are replenished or changed at certain intervals.

Method used

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  • Method and system for operating two-and four-stroke engines using low sulfur fuels
  • Method and system for operating two-and four-stroke engines using low sulfur fuels
  • Method and system for operating two-and four-stroke engines using low sulfur fuels

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Embodiment Construction

[0013]FIG. 1 shows a schematic representation of a system 100 including at least one two-stroke cross-head diesel engine 101. The engine 101 includes a first lubricating system containing system oil 102 and a second lubricating system includes an all-loss lubricant or cylinder oil 107. The system further includes used system oil conduit 103 and 109, system oil recycle loop 108a and 108b, waste tank 106, a fresh system oil tank 105, separator 107, transfer line 112, blending apparatus 104, additive tank 115, fluid storage tank 116, low sulfur-fuel tank 118, high sulfur fuel tank 119 and fuel line 120, for carrying out the method of the present invention. Fluid storage tank 116 may be used to store base oil, trunk piston engine oil, or used trunk piston engine oil.

[0014]According to an embodiment of the present invention, a two-stroke engine may be operated by supplying the blended cylinder oil and a fuel having sulfur content ranging from 1.0 wt. % sulfur to 0.001 wt. % sulfur to the...

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Abstract

A method for operating a two-stroke engine using low sulfur fuels. Blended cylinder oil is produced by blending base oil and at least one additive where the total base number (“TBN”) of the blended cylinder oil ranges from 1 TBN to 20 TBN. The engine is operated by supplying the blended cylinder oil and a fuel having less than 1.0% sulfur to the engine cylinders. The additive includes a low TBN calcium salts at a weight ratio ranging from 90:10 to 10:90; or any combination thereof.A method for operating a 4-stroke engine using low and high sulfur fuels. Blended oil, having a TBN that is greater than 20 TBN, is produced by blending base oil and at least one additive. The engine is operated by exchanging a low sulfur fuel having less than 1.0% sulfur with a high sulfur fuel. The engine lubricating system is switched to the blended cylinder oil in accordance with switching the fuel from a low sulfur fuel to a high sulfur fuel.

Description

RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 874,105, filed Dec. 11, 2006.FIELD OF THE INVENTION[0002]The invention relates to a method of creating blended cylinder oils for use with low sulfur fuels.BACKGROUND OF THE INVENTION[0003]Two-stroke crosshead engines used in marine or stationary applications are equipped with two separate lubricating oil systems. One lubricating system includes so-called system oil that is used in the engine crank case for lubrication and cooling of the engine's bearings and oil-cooled pistons as well as for activation and / or control of various valves or the like. Typical system oils usually have an SAE viscosity of about 30 with a relatively low TBN content, typically below 10. These exemplary values may vary dependent on the actual application and the specific design of the systems that the oils are used in.[0004]The other lubricating system, of a two-stroke crosshead engine, includes an all-loss l...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04
CPCC10L1/02Y02T10/36Y02T10/121F02M25/14F02D19/0652F02D19/0657F02D19/0665C10L1/04C10M175/0091C10N2240/102C10N2230/52C10M2219/046C10M2219/044C10M2207/027C10M2207/028C10M2207/144C10M2207/262C10N2210/02C10N2030/52C10N2040/252Y02T10/12Y02T10/30C10N2010/04
Inventor DAMM, KLAUS-WERNERLEAHY, RICHARD
Owner A P MOLLER AS
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