Heat integration of combined 1st and 2nd generation ethanol production from wheat kernels and wheat straw

Joelsson, Elisabeth; Galbe, Mats; Wallberg, Ola

doi:10.1186/s40508-014-0020-3

Cited by 7 publications

(15 citation statements)

References 26 publications

(39 reference statements)

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“…The simulations were performed using modified versions of Aspen Plus models previously developed by Wingren et al (2004Wingren et al ( , 2008, and Joelsson et al (2014). Heat integration was implemented in the scenarios using Aspen Energy Analyzer (version 8.2) to design heat exchanger networks, as described by Joelsson et al (2014). The capital and operational costs were evaluated using vendors' quotations and Aspen Process Economic Analyzer (APEA).…”

Section: The Process Designmentioning

confidence: 99%

“…Physical property data for biomass components such as lignin and cellulose were taken from the NREL database for biofuel components (Wooley and Putsche, 1996). The simulations were performed using modified versions of Aspen Plus models previously developed by Wingren et al (2004Wingren et al ( , 2008, and Joelsson et al (2014). Heat integration was implemented in the scenarios using Aspen Energy Analyzer (version 8.2) to design heat exchanger networks, as described by Joelsson et al (2014).…”

Section: The Process Designmentioning

confidence: 99%

See 1 more Smart Citation

Integration potential, resource efficiency and cost of forest-fuel-based biorefineries

Joelsson¹,

Wallberg²,

Börjesson³

2015

Computers & Chemical Engineering

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Section: The Process Designmentioning

confidence: 99%

Section: The Process Designmentioning

confidence: 99%

Integration potential, resource efficiency and cost of forest-fuel-based biorefineries

Joelsson¹,

Wallberg²,

Börjesson³

2015

Computers & Chemical Engineering

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“…The physical property database that was developed by the NREL [44] for components in biofuels, such as lignin and cellulose, was used for the biomass components in the simulations. More recent versions the Aspen Plus models by Wingren et al [45,46], Sassner and Zacchi [47], and Joelsson et al [48] were used to perform the simulations.…”

Section: Simulation Toolsmentioning

confidence: 99%

“…Heat integration of the configurations was carried out using Aspen Energy Analyzer (version 8.2) as described [48]. The economic evaluation was performed with the Aspen APEA and the vendors' quotations.…”

Section: Simulation Toolsmentioning

confidence: 99%

Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

Joelsson

Dienes

Kovács

et al. 2016

Sustain Chem Process

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Background: Production of ethanol and biogas from acetic acid-impregnated steam-pretreated wheat straw was investigated. The solid fraction after pretreatment was used at high solids concentrations to generate ethanol by simultaneous saccharification and fermentation (SSF). The residual streams were evaluated with regard to biogas production. The experimental results were used to perform a techno-economic evaluation of a biorefinery concerning ethanol, raw biogas, pellet, and electricity production at various solid contents and residence times in the fermentation step. The configurations were also altered to include biogas upgrading to vehicle fuel quality or fermentation of xylose to ethanol. Results:At a water-insoluble solids (WIS) content in the SSF of between 10 and 20 %, the ethanol yields exceeded 80 %, the highest being 86 % at 12.5 % WIS, expressed as % of the theoretical maximum, based on the glucan content in SSF. Anaerobic digestion of wheat straw hydrolysate and stillage yielded 4.8 and 1.0-1.2 g methane/100 g dry straw, respectively, in 7-day experiments. Maximum recovery of overall product was achieved when SSF was run at between 10 and 15 % initial WIS content, for which the product yields from 100 g dry wheat straw were 16.1-16.3 g ethanol, 5.8-6.0 g methane, and 25 g lignin-rich solid residue. The net present value (NPV) was negative at discount rate of 11 % but positive at 5 % discount rate for all configurations. The 20 % WIS configuration with a residence time of 96 h in the fermentation stage attained the highest NPV. The minimum ethanol selling price varied between 0.72 and 0.87 EUR/L ethanol when the biogas was unchanged and it decreased to between 0.46 and 0.60 EUR/L ethanol when the biogas was upgraded to vehicle fuel quality or when xylose was converted to ethanol. Conclusions:According to the techno-economic assessment, a process that is based on the fermentation of only hexoses to ethanol, and production of raw biogas from xylose is not profitable under the economic assumptions including 11 % discount rate in the evaluation. However, the profitability of a plant can be improved by biogas upgrading to vehicle fuel quality or fermentation of xylose to ethanol.

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“…Increasing global energy demand combined with global warming effects associated with greenhouse gas (GHG) emissions have accentuated the need to find more sustainable and environmentally friendly energy sources to replace fossil fuels [1]. In this context, biofuels could contribute as a player in achieving environmental goals and energy demand.…”

Section: Introductionmentioning

confidence: 99%

Mass and Heat Integration in Ethanol Production Mills for Enhanced Process Efficiency and Exergy-Based Renewability Performance

2019

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This paper presents the process design and assessment of a sugarcane-based ethanol production system that combines the usage of both mass and heat integration (pinch analysis) strategies to enhance the process efficiency and renewability performance. Three configurations were analyzed: (i) Base case: traditional ethanol production (1G); (ii) mass-integrated (1G2G); and (iii) mass and heat-integrated system (1G2G-HI). The overall assessment of these systems was based on complementary approaches such as mass and mass–heat integration, energy and exergy analysis, exergy-based greenhouse gas (GHG) emissions, and renewability exergy criteria. The performances of the three cases were assessed through five key performance indicators (KIPs) divided into two groups: one is related to process performance, namely, energy efficiency, exergy efficiency, and average unitary exergy cost (AUEC), and the other one is associated to environmental performance i.e., exergy-based CO2-equation emissions and renewability exergy index. Results showed a higher exergy efficiency of 50% and the lowest AUEC of all the systems (1.61 kJ/kJ) for 1G2G-HI. Furthermore, the destroyed exergy in 1G2G-HI was lower by 7% and 9% in comparison to the 1G and 1G2G cases, respectively. Regarding the exergy-based GHG emissions and renewability performance (λindex), the 1G2G-HI case presented the lowest impacts in terms of the CO2-equivalent emissions (94.10 gCO2-eq/MJ products), while λindex was found to be environmentally unfavorable (λ = 0.77). However, λindex became favorable (λ > 1) when the useful exergy of the byproducts was considered.

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Heat integration of combined 1st and 2nd generation ethanol production from wheat kernels and wheat straw

Cited by 7 publications

References 26 publications

Integration potential, resource efficiency and cost of forest-fuel-based biorefineries

Integration potential, resource efficiency and cost of forest-fuel-based biorefineries

Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

Mass and Heat Integration in Ethanol Production Mills for Enhanced Process Efficiency and Exergy-Based Renewability Performance

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