Thermal gasification or direct combustion? Comparison of advanced cogeneration systems in the sugarcane industry

Deshmukh, Ranjit; Jacobson, Arne; Chamberlin, Charles; Kammen, D. M.

doi:10.1016/j.biombioe.2013.01.033

Cited by 77 publications

(46 citation statements)

References 18 publications

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“…The most widely practised method of yielding surplus electric power production in traditional sugar mills is by introducing more efficient cogeneration systems. Most commonly, these are high pressure steam Rankine cycle cogeneration systems [3]. This method has been widely implemented in countries like Brazil [4], India [5], and Mauritius [5].…”

Section: Introductionmentioning

confidence: 99%

“…The cogeneration inefficiency of traditional sugar cane mills is due to the fact that most of the traditional sugar mills are found in developing countries and were built up in remote rural areas where there is no national grid connection; thus, the cogeneration units of such mills are designed in such a way that they incinerate the majority of the produced bagasse in order to avoid disposal problems of the residue. Typical live steam parameters for such cogeneration units of sugar mills are in the range of 20-30 bar and 300-400°C [5][6][7], whereas modern cogeneration units of sugar mills operate with boilers having live steam parameters as high as 45-80 bar (just in few cases around 100 bar) and over 450°C [3]. This indicates that the boiler efficiencies in the modern cogeneration units will improve, and thus, there is a possibility of generating surplus power owing to the higher steam parameters of the live steam to be expanded in the power turbines.…”

Section: Introductionmentioning

confidence: 99%

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Upgrading of a traditional sugar cane mill to a modern mill and assessing the potential of energy saving during steady state and transient conditions—part II: models for a modified cogeneration unit

Birru

Erlich

Beyene

2015

Biomass Conv. Bioref.

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It is known that there is a significant amount of thermal energy used for the sugar cane industry for the purpose of power production and for use in the sugar or ethanol processing in cane sugar industries. Likewise, it is understood that there are substantial amounts of waste heat that is not being recovered, in particular for traditional sugar mills. Regardless of this, energy conservation is given less consideration as compared to operational convenience due to the fact that sugar mills are self-sufficient in energy (heat and power). The identification of such potential heat loss areas (especially during transient conditions) suggests the sugar mills play a vital role in energy saving. In this study, a modified setup of the base case plant considered in part I of this paper is assessed for its energy potential and possible major heat losses during steady state and transient conditions where 2-h stoppage of the mill presses are considered to occur. For the modified setup, there are two major scenarios considered having two subscenarios each. The result of the assessment showed that the steady state assumption scenario of the modified plant (where bagasse drying is not considered) indicated a 20 % reduction in the losses considered which resulted in a 57 % power generation increase as compared to the steady state model of the base case plant. It is also possible to save excess bagasse by drying the bagasse for later use during unexpected stoppage. The carbon dioxide emission (amounting 29 t/day in case 2a of this study) that occurs during the use of fuel oil during such stoppages will thus be avoided. The simple economic analysis showed that it is only in case 2a where fuel oil cost is included in the operation cost that resulted in a negative NPV. Since the rest of the scenarios use bagasse as a fuel which is free, the NPV for all was positive. For the electricity price of 0.04 US $/kWh and discount rate of 15 %, the minimum payback period attained is about 3 years (case 1b) where the bagasse moisture content is 30 % whereas the maximum payback period is 6 years (case 1a) where there is no bagasse drying considered.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Upgrading of a traditional sugar cane mill to a modern mill and assessing the potential of energy saving during steady state and transient conditions—part II: models for a modified cogeneration unit

Birru

Erlich

Beyene

2015

Biomass Conv. Bioref.

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“…Typically, plants require 400-550 kg of steam per ton of sugarcane, but, by using state of the art technology, sugar manufacturing and ethanol distillation would require only 280-300 kg-steam/tc (ton of sugarcane). This would imply a significant increase in the electrical power production [7]. Other possible layout configurations are based on gasification of the biomass.…”

Section: Introductionmentioning

confidence: 99%

Challenges in Bioenergy Production from Sugarcane Mills in Developing Countries: A Case Study

2014

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Worldwide energy policies are moving towards a reduction of fossil fuels' share in the energy mix and to invest in renewable and green energy sources. Biomass is one of these, and it represents, in the form of sugarcane, a strategic source in Colombia, especially in the Valle del Cauca. In this region, the sugarcane industry is able to convert the energy content of the cane into different energy products, such as ethanol, electricity, and high-pressure steam, which are cogenerated via bagasse combustion. In this work, the case of a sucrose and ethanol production plant, which mills ten thousand tons of sugarcane per day, is considered. A tailor-made computational model was developed to assess the energy and material process balances in order to estimate the effect of different operating conditions on cogeneration boilers and turbines, and to optimize the overall process efficiency. The current situation was modeled with good precision from the developed model. Likewise, the concept of "Renewable Efficiency" was introduced to explain the degree of green power, which a process plant is able to produce. Consequently, new innovative solutions and process layouts were proposed in order to increase their renewable efficiency. With the new configurations, a convenient energy surplus of up to 33 MW can be reached, which could be sold in the national electricity grid, representing long-term interesting economic benefits for the company. OPEN ACCESSEnergies 2014, 7 5875

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“…Esse aproveitamento poderia se dar pela queima da palhada em caldeiras, como uma fonte de combustível adicional ao bagaço para a geração de energia (DESHMUKH, 2013 Atualmente, com a demanda de equipamentos para recolhimento de biomassa visando à produção de etanol de segunda geração e de energia elétrica, houve o desenvolvimento de equipamentos com maior capacidade, os quais poderiam reduzir o custo de recolhimento da palhada e, consequentemente, a redução do custo da energia elétrica produzida a partir dessa fonte.…”

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Análise Técnico Econômica Do Aproveitamento Da Palhada Da Cana-De-Açúcar Na Geração De Energia Elétrica No Norte Do Paraná

et al. 2017

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RESUMO:A palhada representa um terço da energia primária da cana-de-açúcar, mas a sua utilização ainda é incipiente, apesar da grande potencialidade para o seu aproveitamento. O objetivo do trabalho foi avaliar o potencial de geração de energia elétrica da palhada de cana-de-açúcar em conjunto com o bagaço, através de uma análise técnico-econômica. Realizou -se o dimensionamento de uma frota dedicada ao recolhimento da palhada e de uma nova planta de cogeração, com substituição das caldeiras e turbinas existentes, inclusive as turbinas de acionamento dos equipamentos de preparação e extração, em uma usina típica do norte do Paraná. Foram estimados os investimentos necessários para a aquisição dessa frota e da modernização proposta para a área industrial. Os custos do recolhimento da palhada e da geração de energia elétrica foram calculados, bem como o preço mínimo de venda da energia. Também foram calculados a quantidade de consumidores residenciais e os municípios que poderiam ser abastecidos por essa energia. A capacidade de exportação é de 111,912 kWh por tonelada de cana-de-açúcar, com custo da palhada no pátio de bagaço da usina a R$68,08 t -1 , custo da energia-elétrica de R$125,55 MWh e preço mínimo de comercialização da energia a R$316,64 MWh. A energia elétrica exportada pode atender uma população de 87.946 pessoas, o que corresponde a energia consumida pela cidade onde estaria localizado o projeto e de mais seis municípios canavieiros do Norte do Paraná. O projeto proporciona a criação de 96 novos empregos diretos. PALAVRAS-CHAVES:Cogeração, eletricidade, bioenergia, biomassa, enfardamento. TECHNIC-ECONOMIC EVALUATION OF SUGARCANE STRAW FOR POWER GENERATION IN PARANA STATE ABSTRACT:The straw represents one-third of the sugarcane's primary energy, but its exploitation is still incipient, despite having a huge potential for its utilization. This research aimed to evaluate the potential energy generation of sugarcane residues together with the bagasse, through a technical and economic analysis. The fleet sizing dedicated to straw harvesting and a new combined heat and power plant, replacing the existing boilers and turbines, inclusive the turbines of preparation and extraction, was made in a north of Parana's typical sugarcane mill. All the investments required were estimated in order to purchase this new fleet and proposals for the modernization of the industrial area. The straw harvesting and electrical power generation expenses were determined, as well as the energy's minimum selling price. The residential consumers were also estimated and as well as the cities that could be supplied with this energy. The export capability is 111.912 kW per ton of cane, the straw in the plant's stockyards R$68.08 t INTRODUÇÃOA cana-de-açúcar (Saccharum spp) é uma importante cultura a nível mundial, não só pela produção de açúcar, mas também como uma cultura energética, devido à sua grande produtividade de matéria seca (SUREDRAN et al., 2016 A energia primária da cana-de-açúcar é de, aproximadamente, 7400 MJ por tonela...

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Thermal gasification or direct combustion? Comparison of advanced cogeneration systems in the sugarcane industry

Cited by 77 publications

References 18 publications

Upgrading of a traditional sugar cane mill to a modern mill and assessing the potential of energy saving during steady state and transient conditions—part II: models for a modified cogeneration unit

Upgrading of a traditional sugar cane mill to a modern mill and assessing the potential of energy saving during steady state and transient conditions—part II: models for a modified cogeneration unit

Challenges in Bioenergy Production from Sugarcane Mills in Developing Countries: A Case Study

Análise Técnico Econômica Do Aproveitamento Da Palhada Da Cana-De-Açúcar Na Geração De Energia Elétrica No Norte Do Paraná

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