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Kvalitet och processprestanda inom cementindustrins råmjölstillverkning
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2019 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Quality and process performance in the cement industy's raw meal production (English)
Abstract [sv]

Under detta arbete studeras en av Europas mest moderna cementfabriker med kapacitet att producera runt 2,6 miljoner ton cement per år. Syftet med examensarbetet är att beskriva variationen i utfallen av råmjöl och identifiera vilka orsaker till variation som är möjliga att minska. Oavsiktliga variationer av kvalitet i råmjölet kan resultera i bristande klinkerkvalitet, som i sin tur kan medföra en betydande intäktsförlust. Arbetet utgår från teorier om offensiv kvalitetsutveckling, Six sigma, processledning och cementproduktion. En metodkombination av kvantitativa och kvalitativa metoder har tillämpats för datainsamling och dataanalys, där den kvantitativa datainsamlingen baserats på historiska data från referensorganisationen. De slutsatser som redogörs för, är att processen som studeras har möjlighet till att prestera i världsklass. Huvudsakliga bidragande orsaken är metoden för styrning där systemet saknar styrgränser som leder till överstyrning. Även materialvariation vid byten av råmaterialslimpor är en betydande orsak till variansen i råmjölet. Förutsatt att styrsystemet kopplas på för tidigt efter ett genomfört limpbyte kan effekten av ett limpbyte förvärras. Vidare tyder resultaten på att 80% av den totala variationen i råmjölets kalkmättnad skapas av limpbyten.

Abstract [en]

During this work, one of Europe's most modern cement factories is studied, with the capacity to produce around 2.6 million tons of cement per year. The purpose of the thesis is to describe the variation in the outcome of raw meal and identify which causes of variation are possible to reduce. Involuntary variations in the quality of the input raw meal can result in a lack of clinker quality, which in turn can result in a significant loss of revenue. The work is based on theories relating to Total Quality Management, process management and cement production. A method combination of quantitative and qualitative methods has been applied for data collection and data analysis, where the quantitative data collection is based on historical data gathered from the reference organization. The conclusions outlined are that the process being studied has the opportunity to perform world-class. The main contributing factor is the method for control where the system lacks control limits that lead to over compensation. Also, material variation in the case of changes of raw material piles is a significant cause of the variance in the raw meal. Provided that the control system is switched on prematurely after a raw material pile change has been carried out, the effect of the change can be worsened. Furthermore, the results indicate that 80% of the total variation in the raw meal’s lime saturation is created by raw material pile changes.

Place, publisher, year, edition, pages
2019. , p. 49
Keywords [en]
capability, cement industry, lime saturation, process performance, process, quality, raw meal, standard deviation, variation, variance contribution.
Keywords [sv]
cementindustri, duglighet, kalkmättnad, kvalitet, process, processprestanda, råmjöl, standardavvikelse, variation, variansbidrag.
National Category
Reliability and Maintenance
Identifiers
URN: urn:nbn:se:uu:diva-387795ISRN: ISRN UTH-INGUTB-EX-KL-2019/02-SEOAI: oai:DiVA.org:uu-387795DiVA, id: diva2:1330537
Educational program
Bachelor Programme in Quality Engineering and Management
Supervisors
Examiners
Available from: 2019-06-27 Created: 2019-06-25 Last updated: 2019-06-27Bibliographically approved

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