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Assessing the potential of energy saving in a traditional sugar canemill during steady state and transient conditions: part I: basecase plant model
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: www.0000-0001-8091-8767
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
Addis Ababa University, Ethiopia.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0002-3661-7016
2015 (English)In: Biomass Conversion and Biorefinery, ISSN 2190-6823Article in journal (Refereed) Published
Abstract [en]

Sugar cane mills are energy intensive industries andalso have a large potential of providing surplus energy interms of heat or power. Identification of heat and mechanicallosses in sugar mills is one approach in indicating energysaving potential in sugar mills, especially in traditional mills.Such assessment of the energy flows in sugar mills needs to bedone both in steady state and transient conditions (where suddenstoppages occur). In this paper, such an approach is consideredwhere a base case plant is modeled for steady state andtransient state operations. For the transient state study, a typicalstoppage is chosen and three different scenarios aremodeled. Heat loss calculations are done for major cogenerationunits and for the amount accumulated of the surplus bagassewhen the steady state operation is estimated. The resultsof the models show that during steady state operation, thelosses related to mechanical prime movers is on the higherside as the mills and shredder are driven by steamand generatemechanical power higher than what is needed by the mills andthe shredder equipment themselves. In the transient statescenarios, where fuel oil is introduced during press mill stoppage,there is steam wasted (steam that could have been usedfor mechanical power generation) starting from the periodwhere the fuel oil is introduced until the power required duringthe stoppage is reached. The CO2 emission during the use offuel oil is also quite significant during the stoppage.

Place, publisher, year, edition, pages
Springer, 2015.
Keywords [en]
Sugar cane, Heat loss, Sudden stoppage, Transient, Model
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-185729DOI: 10.1007/s13399-015-0179-1ISI: 000377398800010Scopus ID: 2-s2.0-84978024364OAI: oai:DiVA.org:kth-185729DiVA, id: diva2:923180
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20160512

Available from: 2016-04-25 Created: 2016-04-25 Last updated: 2019-05-20Bibliographically approved
In thesis
1.
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2. Process Utility Performance Evaluation and Enhancements in the Traditional Sugar Cane Industry
Open this publication in new window or tab >>Process Utility Performance Evaluation and Enhancements in the Traditional Sugar Cane Industry
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The need to achieve sustainable development has led to devising various approaches for the efficient utilization of natural resources. Renewable energy technology and energy efficiency measures feature prominently in this regard, and in particular for industries such as sugar production:  the sugar cane industry’s eponymous feedstock is a renewable resource, and mills have potential for increased energy savings via improvements to cogeneration units, electric drive retrofitting, and other measures.  The overall objective of this research work is to investigate different approaches of efficiency improvements for enhancing sugar cane conversion, thereby increasing the services obtained including surplus electric power delivery. Traditional sugar cane mills, i.e. those that lack modern components such as high-performance boilers and electric drives, are the focus of this investigation. 

System simulations show that modern mills generate more electrical power as compared to traditional mills, with power-to-heat ratios nearly one order of magnitude higher (i.e. 0.3-0.5).  Comparison of the thermodynamic performance of three retrofits showed that such modifications could raise the performance of traditional mills to approach those for their modern counterparts. Results for a base case traditional plant show that losses related to mechanical prime movers are high, since the mills and shredder are driven by steam and generate excess mechanical power. When considering press mill stoppages, steam is wasted during the ensuing fuel oil-fired start-up period. CO2emission for such transient conditions can be decreased owing via bagasse drying and storage. 

 

In studying both energy and water impacts, a comparison of four technological improvements demonstrates benefits outside the crushing season for three scenarios: recovery of excess wastewater for enhanced imbibition; recovery of waste heat for thermally-driven cooling; and pelletization of excess bagasse. The fourth option, involving upgrading of the mill’s cogeneration unit, is advantageous for continuous surplus power supply.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2019. p. 120
Series
TRITA-ITM-AVL ; 2019:21
Keywords
Sugar cane, energy saving, heat loss, steady state, transient state, CO2 emission; absorption chiller, pellet, bagasse drying, energy perfor-mance, traditional mills, modern mills, waste water, surplus power
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-251736 (URN)978-91-7873-231-9 (ISBN)
Public defence
2019-08-20, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Sida - Swedish International Development Cooperation Agency
Available from: 2019-05-24 Created: 2019-05-20 Last updated: 2019-05-24Bibliographically approved

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