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Energy performance comparisons and enhancements in the sugar cane industry
KTH, Skolan för industriell teknik och management (ITM), Energiteknik.ORCID-id: www.0000-0001-8091-8767
KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
KTH, Skolan för industriell teknik och management (ITM), Energiteknik.
2019 (Engelska)Ingår i: Biomass Conversion and Biorefinery, ISSN 2190-6815, E-ISSN 2190-6823, Vol. 9, nr 2, s. 267-282Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this study, energy-related operational parameters for modern and traditional (conventional) sugar mills are analyzed, with the goals of identifying improvements in energy efficiency and potential for surplus electricity export. Results show that the power- to-heat ratio of modern and traditional mills is clearly distinct, lying in the ranges of 0.3–0.5 and 0.04–0.07, respectively. Modifications under consideration for the traditional mills include the following upgrades: electric drives and higher capacity back-pressure turbine (case 1); high-pressure boiler, condensing extraction steam turbine and electric drives (case 2); and improvements in case 2 plus bagasse drying (case 3). The thermodynamic impact of these modifications shows that more power is generated as the modification becomes more advanced. Case 1 exhibits a modest increase in cogeneration efficiency (4%) as compared to the base case, while the cogeneration efficiency increase is more marked for cases 2 and 3 (21% and 31%, respectively). Surplus power was studied in a regional context, where it was found that the contribution of 19 retrofitted sugar mills in nine Brazilian regions could supply 30% or more power as compared to current installed power capacity. The economic analysis showed that levelized cost of electricity (LCOE) was lowest for case 1 (11 USD/MWh) and highest for cases 2 and 3 (58 USD/kWh).

Ort, förlag, år, upplaga, sidor
Springer Berlin/Heidelberg, 2019. Vol. 9, nr 2, s. 267-282
Nyckelord [en]
Sugarcane; Traditional mills; Modern mills; LCOE; Energy performance; Model
Nationell ämneskategori
Energiteknik
Forskningsämne
Energiteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-207111DOI: 10.1007/s13399-018-0349-zISI: 000468144300003Scopus ID: 2-s2.0-85065905311OAI: oai:DiVA.org:kth-207111DiVA, id: diva2:1095860
Anmärkning

QC 20190910

Tillgänglig från: 2017-05-16 Skapad: 2017-05-16 Senast uppdaterad: 2019-09-10Bibliografiskt granskad
Ingår i avhandling
1.
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2. Process Utility Performance Evaluation and Enhancements in the Traditional Sugar Cane Industry
Öppna denna publikation i ny flik eller fönster >>Process Utility Performance Evaluation and Enhancements in the Traditional Sugar Cane Industry
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
KTH Royal Institute of Technology, 2019. s. 120
Serie
TRITA-ITM-AVL ; 2019:21
Nyckelord
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
Nationell ämneskategori
Energiteknik
Forskningsämne
Energiteknik
Identifikatorer
urn:nbn:se:kth:diva-251736 (URN)978-91-7873-231-9 (ISBN)
Disputation
2019-08-20, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Sida - Styrelsen för internationellt utvecklingssamarbete
Tillgänglig från: 2019-05-24 Skapad: 2019-05-20 Senast uppdaterad: 2019-05-24Bibliografiskt granskad

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Birru, EyerusalemErlich, CatharinaMartin, Andrew
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