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A Comparison of Various Technological Options for Improving Energy and Water Use Efficiency in a Traditional Sugar Mill
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.
University “Marta Abreu” of Las Villas (UCLV), Cuba.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0002-3661-7016
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2016 (English)In: Sustainability, ISSN 2071-1050, E-ISSN 2071-1050, Vol. 8, no 12, article id 1227Article in journal (Refereed) Published
Abstract [en]

This study is a comparison of four technological improvements proposed in previous works for the Cuban sugar mill Carlos Balino. These technological options are: (1) utilization of excess wastewater for enhanced imbibition; (2) utilization of waste heat for thermally driven cooling; (3) utilization of excess bagasse for pellets; and (4) modification of the cogeneration unit for maximum electric power generation. The method used for the evaluation of the technological options involves using criteria such as energy saving, financial gains, and CO2 emission saving potential. The results of the analysis show that the first three technological improvement options are attractive only during the crushing season. On the other hand, the last technological improvement option can be attractive if a year round generation of surplus power is sought. The first technological improvement option leads to only minor changes in energy utilization, but the increase in sugar yield of 8.7% leads to attractive profitability with an extremely low payback period. The CO2 emissions saved due to the fourth technological improvement option are the highest (22,000 tonnes/year) and the cost of CO2 emissions saved for the third technological improvement option (lowest) amount to 41 USD/tonne of CO2 emissions saved. The cycle efficiencies of the third and fourth technological improvement options are 37.9% and 36.8%, respectively, with payback periods of 2.3 and 1.6 years. The second technological improvement option is the least attractive alternative of the group.

Place, publisher, year, edition, pages
MDPI AG , 2016. Vol. 8, no 12, article id 1227
Keywords [en]
sugar cane bagasse, Carlos Balino, energy efficiency, wastewater reuse, imbibition, CO2 emission, absorption chiller, pellet, electricity, energy saving, payback period
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-199509DOI: 10.3390/su8121227ISI: 000389317100018Scopus ID: 2-s2.0-85007346954OAI: oai:DiVA.org:kth-199509DiVA, id: diva2:1066051
Note

QC 20170117

Available from: 2017-01-17 Created: 2017-01-09 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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