Optimization of Power Generation from Bagasse and Sugarcane Waste in a Brazilian Sugar and Alcohol Mill

Maués, Jair Arone

doi:10.1007/978-3-540-75997-3_495

Cited by 7 publications

(6 citation statements)

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“…Energy & Fuels However, there are factors that disfavor the first law efficiency in relation to the second law. Those are (1) The thickness of glycerol around SCB particles fed to the gasifier increases from Case 1 to Case 6. (2) Greater liquid thickness tends to impose a barrier for the reactions between gases and the solid carbonaceous particles.…”

Section: Energy and Fuelsmentioning

confidence: 93%

“…On the one hand, thermoelectric power generation based on renewable sources, such as biomass, have gained substantial ground on the overall picture of power generation when compared with more traditional ones, such as coal and other fossil fuels. Such progress has been described in the literature, − and that has led to positive environmental aspects. , On the other hand, the production of biodiesel has increased reaching substantially. In Brazil alone, it reached around 4 000 000 m 3 in the present year, and 11% of that is generated as glycerol .…”

Section: Introductionmentioning

confidence: 96%

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Theoretical Study on the Effect of Glycerol Fraction in Slurries with Biomass Consumed by a Power-Generation Process

Souza-Santos

Camara

2017

Energy Fuels

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Previous works have shown that glycerol, which is a residue from biodiesel production, can be applied to greatly increase the efficiency of power generation processes consuming biomass, such as sugar cane bagasse (SCB). The proposed process departs from a biomass and glycerol slurry, which is pumped into a pressurized gasifier. The produced gas is cleaned to reach particle content and sizes as well alkaline concentration allowed to be injected into commercially available axial gas turbines. The removal of alkaline is achieved through cooling the gas to temperatures below the dew-point of those chemical species. Energy recovered from that cooling and from the gas turbine exit drives two steam cycles. The present theoretical investigation assesses the effects of glycerol concentration in the slurry with wet biomass fed to the process on its overall efficiency. In addition, the gasifier operational pressure is increased to the limit allowed for air compression by axial compressors without intercooling. This work shows that efficiencies can reach levels nearing 46% and discusses the effect of glycerol fraction in the biomass slurry on the overall power-generation process. The present work is a technical feasibility study. Economic analysis or considerations are beyond its scope and have been left for future investigations.

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Section: Energy and Fuelsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 96%

Theoretical Study on the Effect of Glycerol Fraction in Slurries with Biomass Consumed by a Power-Generation Process

Souza-Santos

Camara

2017

Energy Fuels

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“…As local farmers are not capable to buy expensive large-scale harvester due to socio-economic issues, conventional practice to get rid of trash is burning in field or by manual operation (Dawson and Boopathy, 2007). 75% of total trash is burnt and 25% is left on the field as waste (Maues, 2007). Burning action not only deplete this renewable energy resource (trash) but also generates particles (<10µm) which cause bronchitis, asthma and other lung diseases (Dawson and Boopathy, 2006).…”

Section: Introductionmentioning

confidence: 99%

Optimizing mechanical and crop physical factors for sugarcane trash recovery at farm

Ikram¹

2021

PAKJAS

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Increasing fuel prices in international market and depletion of fossil fuel resources are reasons to find new and cheap energy resources to meet increasing energy demands throughout the world. Potential energy resources include wind, solar, geothermal, tidal and biomass. Biomass can be collected from wheat, rice and sugarcane fields. Sugarcane is most abundant cultivated crop in world providing trash (leaves and tops) and baggas as renewable energy resource for power generation which can replace 50% use of fossil fuels. Because of poor sugarcane mechanization status in Pakistan, traditional practice to get rid of this extraneous material is to burn the trash in standing crop or by manual means which is hectic due to decreasing labour availability for agricultural practices. 20-30% trash is delivered to mill along with stalk due to poor cleaning efficiency resulting deduction in farmer payment and lowering mill sugar recovery efficiency. Sugarcane stripping machine was developed for small scale farmers and different mechanical and crop physical factors were investigated to improve trash recovery and to reduce labour dependence and in field burning practice on local farms during 2018-2019 at University of Agriculture Faisalabad. The investigating crop physical factors included crop varieties (V1=US-658, V2=HSF-240, V3=CPF-249), moisture content in trash (MC1=8.2, MC2=17.6) and mechanical factors included velocity ratio between intake rollers (VR1=1.3, VR2=1.7, VR3=1.9), cleaning element speeds (CE1=660 rpm, CE2=763 rpm, CE3= 1033 rpm) and intake roller combinations types (C1, C2, C3). Three replications for each factor were recorded and data was statistically analyzed under factorial design. Results revealed that by combining V1, MC1, VR2, CE3 and C3 factors, trash recovery efficiency of 97% can be achieved.

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“…The application of biomass, particularly sugar cane bagasse (SCB), as a renewable source of power with near-zero overall greenhouse gas emissions − has increased. − Presently, nearly 10 GW or around 8% of the Brazilian electric power capacity comes from thermoelectric units based on SCB . That represents in a 5-fold increase on the value achieved in 2006. , …”

Section: Introductionmentioning

confidence: 99%

Very High-Pressure Fuel-Slurry Integrated Gasifier/Gas Turbine (FSIG/GT) Power Generation Applied to Biomass

Souza-Santos

2015

Energy Fuels

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The work contributes to the study of the fuel-slurry integrated gasifier/gas turbine (FSIG/GT) concept for the electric power generation process consuming biomass or, more specifically, sugar cane bagasse (SCB). The FSIG/GT process allows for pumping of the solid fuel as a slurry into pressurized reactors, therefore dispensing the need for complex systems of sequential lock hoppers. The slurry drying is achieved through the application of a residual hot gas stream from the process. Because the dryer and gasifier operate at similar pressures, the transfer of particles can be made using simple rotary valves and Archimedes screws. The produced fuel gas is cleaned and injected into the turbine. Previous studies were limited at operational pressures around 2 MPa, while the present evaluates the process working at the vicinity of 10 MPa. This requires intercooling between compression stages as a result of limits of the temperature imposed by the axial compressor blade materials. Rankine cycles are employed to recover energy from the gas-cleaning and exiting process streams as well from the compression intercooling systems. At the present stage investigation, operations at 10 MPa led to overall efficiencies around 34%. That is significantly higher than that presently practiced at power plants of large sugar and alcohol mills but below that achieved in previous studies of FSIG/GT processes consuming SCB and operating around 2 MPa. The main reason for that is attributed to the impossibility of total energy recover and irreversibilities introduced during intercooling. Future works might improve that value.

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Optimization of Power Generation from Bagasse and Sugarcane Waste in a Brazilian Sugar and Alcohol Mill

Cited by 7 publications

References 1 publication

Theoretical Study on the Effect of Glycerol Fraction in Slurries with Biomass Consumed by a Power-Generation Process

Theoretical Study on the Effect of Glycerol Fraction in Slurries with Biomass Consumed by a Power-Generation Process

Optimizing mechanical and crop physical factors for sugarcane trash recovery at farm

Very High-Pressure Fuel-Slurry Integrated Gasifier/Gas Turbine (FSIG/GT) Power Generation Applied to Biomass

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