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Research for a Replacement of the Lube Oil Centrifuge Separation System at Borealis AB
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
University West, Department of Engineering Science, Division of Industrial Engineering and Management, Electrical- and Mechanical Engineering.
2019 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This bachelor's thesis has been carried out at Borealis AB in Stenungsund, Sweden. The report presents a research for a replacement of two centrifuge separators. The separators is purifying the oil that lubricates machinery bearings and regulate the hydraulic control system on the steam powered turbines. These turbines drive the compressors C-1701 and C-1951. The separators installed at Borealis need to be changed because they are end-of-life. They require a lot of maintenance and spare parts are hard to find. An oil separator's task is to separate water from the oil and therefore maintain the quality of the oil. The water can enter the lubricating system from the steam turbines if a seal fails.

The research started with collecting information about centrifuge separators to understand the principle of the separating method. Other methods for separation of oil and water were investigated to find the most effective, reliable, and most suitable product for the lubricating system. A requirement specification was made to make sure that the final recommended product fulfils all the necessary requirements. The place where the separators are going to be installed is an area where an explosive atmosphere can occur, and therefore there are higher demands on the products.

A market survey was done, which included benchmarking and contacting suppliers for oil separators. The benchmark was done to see how similar industries with steam turbines solve the problem with water in the lube oil. The turbine manufacture, Thermodyn, was contacted to see what kind of oil separators they recommend for their turbines. Potential products were surveyed based on the benchmarking and the requirement specification. The product selection was made based on a concept screening method that is used in product development.

The final recommendation was a vacuum dehydration separator from Pall called HXP022. The main benefit with a vacuum dehydrator is that it can remove the dissolved water from the oil, which increases the quality of the oil and therefore decreases the wear on the components. A centrifuge separator only removes the free water from the oil. An alternative recommendation was presented; a centrifuge separator from Alfa Laval, which uses the same method as the old separator at Borealis. The benefit with centrifuge separators is that they can separate water more rapidly than vacuum dehydrators. The final choice should be done by Borealis based on what is more important; separating the water from the oil quickly in case of a large water leakage or increasing the quality of the oil.

Place, publisher, year, edition, pages
2019. , p. 34
Keywords [en]
Steam powered turbines, separators
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:hv:diva-13772Local ID: EXM502OAI: oai:DiVA.org:hv-13772DiVA, id: diva2:1303248
Subject / course
Mechanical engineering
Educational program
Maskiningenjör
Supervisors
Examiners
Available from: 2019-04-16 Created: 2019-04-09 Last updated: 2019-04-16Bibliographically approved

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