Assessing the potential of energy saving in a traditional sugar cane mill during steady state and transient conditions—part I: base case plant model

Birru, Eyerusalem; Erlich, Catharina; Beyene, Getachew Bekele

doi:10.1007/s13399-015-0179-1

Cited by 4 publications

(7 citation statements)

References 10 publications

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“…The LHVof bagasse on dry basis where it is not specified is taken as 17.6 MJ/kg based on calculations by Birru et al [12], and the LHV on total basis is calculated from Eq. 1 [32].…”

Section: Heat Balance Equationsmentioning

confidence: 99%

“…The other mills (apart from these four mills) have mechanical turbines, and thus, thermal energy consumption is on the higher side as compared to mills A-D. Usually, sugar mills having mechanical steam turbines that drive cane preparation units have higher steam consumption due to the poor efficiency of the mechanical steam turbines. Replacement of these turbines with electric drives will improve the electrical power generation since steam will be saved [11,12]. As can be seen from Fig.…”

Section: Efficiency Improvement Due To the Replacement Of Mechanical mentioning

confidence: 99%

“…In particular, variable speed electric drives have been proven to be a better option for replacing the steam turbines used for mechanical power generation in traditional sugarcane mills [7,11]. Among others, the advantage of having electric drives instead of steam turbines is to efficiently utilize the high-pressure steam and be able to create operation flexibility of generating surplus electrical power [10][11][12]. In addition, variable speed electric drives work to match the varying load of cane crushed.…”

Section: Introductionmentioning

confidence: 99%

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Energy performance comparisons and enhancements in the sugar cane industry

Birru

Erlich

2018

Biomass Conv. Bioref.

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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 powerto-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).

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“…The LHVof bagasse on dry basis where it is not specified is taken as 17.6 MJ/kg based on calculations by Birru et al [12], and the LHV on total basis is calculated from Eq. 1 [32].…”

Section: Heat Balance Equationsmentioning

confidence: 99%

Section: Efficiency Improvement Due To the Replacement Of Mechanical mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy performance comparisons and enhancements in the sugar cane industry

Birru

Erlich

2018

Biomass Conv. Bioref.

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“…During unplanned stoppages the cogeneration unit does not normally stop fully, rather the bagasse flow to the boiler will decrease, thus the boiler runs at a lower load. There are conditions where sugar mills use fuel oil during unplanned stoppages, incurring an extra cost and resulting in relatively high carbon dioxide emissions [13]. This is not the case in Carlos Baliño as the existing boilers can use only bagasse or wood.…”

Section: Cogeneration At Carlos Baliño Sugar Millmentioning

confidence: 99%

“…Thus, it is obvious that operation of the sugar mill at nominal parameters is not always the case. The actual operational parameters vary throughout the crushing season due to unexpected interruptions during the operation of the sugar mill [13]. This leads to variation of collected data in different crushing season and this is experienced during the in-field study conducted in different years resulting some difference in the actual operation data collected from the Baliño [7][8][9][10].…”

Section: Mass and Energy Balance Relationsmentioning

confidence: 99%

A Comparison of Various Technological Options for Improving Energy and Water Use Efficiency in a Traditional Sugar Mill

et al. 2016

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This study is a comparison of four technological improvements proposed in previous works for the Cuban sugar mill Carlos Baliño. 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 CO 2 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 CO 2 emissions saved due to the fourth technological improvement option are the highest (22,000 tonnes/year) and the cost of CO 2 emissions saved for the third technological improvement option (lowest) amount to 41 USD/tonne of CO 2 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.

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Systematic review of life cycle assessments applied to sugarcane bagasse utilization alternatives

Khatri

Pandit

2022

Biomass and Bioenergy

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Assessing the potential of energy saving in a traditional sugar cane mill during steady state and transient conditions—part I: base case plant model

Cited by 4 publications

References 10 publications

Energy performance comparisons and enhancements in the sugar cane industry

Energy performance comparisons and enhancements in the sugar cane industry

A Comparison of Various Technological Options for Improving Energy and Water Use Efficiency in a Traditional Sugar Mill

Systematic review of life cycle assessments applied to sugarcane bagasse utilization alternatives

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