Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
Authors: Joerg Reher
Project Leader Marine & Power Engine Lubricants Development Shell Global Solutions (Deutschland) GmbH, Germany
Thijs Schasfoort
Product Application Specialist - Lubricants for Stationary Engines Shell Global Solutions International B.V., Netherlands
Richard Holdsworth
Global Product Marketing Manager - Power and Industry Shell International Petroleum Co Ltd, UK
Abstract
Shell Lubricants is introducing into the market, a new member to the Mysella range of Gas Engine Lubricants. The new product, currently named Shell Mysella S5 S, has been especially formulated for gas engines running on all types of biogas, including gas produced from biomass or manure, sewage gas and landfill gas.
In this paper Shell will present findings of the research that has been executed during its development. The paper describes the challenges that different qualities of biogas impose on the engine and the lubricating oil. It describes what properties a lubricating oil for biogas operation should ideally have, and different formulation routes to achieve these.
The performance of different candidate formulations is presented in the form of field trial results, where the focus is on:
1) Extension of oil life, by looking at the candidate’s resistance to oxidation and its ability to neutralize acids from the combustion gas.
2) Improved engine protection, by minimizing deposit formation tendency and maximising engine cleanliness.
Finally this paper explains which candidate has been chosen to become the new Shell Mysella S5 S and how the performance of this oil will help the operator to reduce cost of operations.
1. Introduction
Organic material can be used as a source of combustible gas. In an oxygen free environment the organic material is digested by bacteria that produce a gas consisting of methane, CO2 and various trace constituents.
Many types of organic material can be used to produce gas, including organic waste. Most common examples are: gas from agricultural biomass, gas from livestock manure, gas from sewage cleaning sites, and gas from landfill sites. These types of gas are collectively called biogas. Biogas is a renewable fuel. Biogas can be suitably converted into electricity with the help of a gas engine. The gas engine has a relatively high single cycle efficiency, typically >40%, and a relatively low level of harmful exhaust gas emissions. The gas engine has proven to run reliably on different qualities of biogas, although with certain biogas qualities the engine requires more maintenance than the same engine running on natural gas.
The success of gas engines in biogas applications is illustrated by the large number of installations in operation already. In 2007 one of the leading suppliers of biogas engines, GEJenbacher, reported to have installed more than 1450 biogas systems in agricultural applications and 1300 systems in landfill gas applications, totalling more than 2200 MW of electrical capacity (ref 1). Several sources on the internet predict a large growth in the coming decades (ref 2, ref 3).
LUBE MAGAZINE NO.124 DECEMBER 2014 23 Part 1
No.96 page 1
Shell Introduces a New Long Life Lubricant for Engines Burning Sour
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