Energy, exergy and environmental analyses of conventional, steam and CO2-enhanced rice straw gasification

A. M. Parvez; I. M. Mujtaba; T. Wu

doi:10.1016/j.energy.2015.11.022

Energy, exergy and environmental analyses of conventional, steam and CO₂-enhanced rice straw gasification

A. M. Parvez, I. M. Mujtaba, T. Wu

Research output: Journal Publication › Article › peer-review

85 Citations (Scopus)

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Abstract

In this study, air, steam and CO₂-enhanced gasification of rice straw was simulated using Aspen Plus™ and compared in terms of their energy, exergy and environmental impacts. It was found that the addition of CO₂ had less impact on syngas yield compared with gasification temperature. At lower CO₂/Biomass mass ratios (<0.25), CO₂-enhanced gasification showed a lower GSE (gasification system efficiency) than conventional gasification, which was below 22.1%. However at higher CO₂/Biomass ratios, CO₂-enhanced gasification demonstrated higher GSE than conventional gasification. The GSE of CO₂-enhanced gasification continued to increase to 58.8% when CO₂/Biomass ratio was raised to 0.87. It was also found that chemical exergy was 2.05-4.85 times higher than physical exergy. The syngas exergy increased with CO₂ addition, which was mainly due to the increase in physical exergy. The maximum exergy efficiency occurred in the temperature range of 800 °C-900 °C. For CO₂-enhanced gasification, exergy efficiency was found to be more sensitive to temperature than CO₂/Biomass ratios. In addition, the preliminary environmental analysis showed that CO₂-enhanced gasification resulted in significant environmental benefits compared with steam gasification. However novel assessment methodologies are still needed to better evaluate the advantages of CO₂ utilization.

Original language	English
Pages (from-to)	579-588
Number of pages	10
Journal	Energy
Volume	94
DOIs	https://doi.org/10.1016/j.energy.2015.11.022
Publication status	Published - 1 Jan 2016

Keywords

Biomass
CO-enhanced gasification
Conventional gasification
Energy analysis
Environmental analysis
Exergy analysis

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Pollution
Mechanical Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.energy.2015.11.022

mujtaba_energy_exergyAccepted author manuscript, 1.02 MBLicence: CC BY-NC-ND

Cite this

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title = "Energy, exergy and environmental analyses of conventional, steam and CO2-enhanced rice straw gasification",

abstract = "In this study, air, steam and CO2-enhanced gasification of rice straw was simulated using Aspen Plus{\texttrademark} and compared in terms of their energy, exergy and environmental impacts. It was found that the addition of CO2 had less impact on syngas yield compared with gasification temperature. At lower CO2/Biomass mass ratios (<0.25), CO2-enhanced gasification showed a lower GSE (gasification system efficiency) than conventional gasification, which was below 22.1%. However at higher CO2/Biomass ratios, CO2-enhanced gasification demonstrated higher GSE than conventional gasification. The GSE of CO2-enhanced gasification continued to increase to 58.8% when CO2/Biomass ratio was raised to 0.87. It was also found that chemical exergy was 2.05-4.85 times higher than physical exergy. The syngas exergy increased with CO2 addition, which was mainly due to the increase in physical exergy. The maximum exergy efficiency occurred in the temperature range of 800 °C-900 °C. For CO2-enhanced gasification, exergy efficiency was found to be more sensitive to temperature than CO2/Biomass ratios. In addition, the preliminary environmental analysis showed that CO2-enhanced gasification resulted in significant environmental benefits compared with steam gasification. However novel assessment methodologies are still needed to better evaluate the advantages of CO2 utilization.",

keywords = "Biomass, CO-enhanced gasification, Conventional gasification, Energy analysis, Environmental analysis, Exergy analysis",

author = "Parvez, {A. M.} and Mujtaba, {I. M.} and T. Wu",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2016",

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doi = "10.1016/j.energy.2015.11.022",

language = "English",

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T1 - Energy, exergy and environmental analyses of conventional, steam and CO2-enhanced rice straw gasification

AU - Parvez, A. M.

AU - Mujtaba, I. M.

AU - Wu, T.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - In this study, air, steam and CO2-enhanced gasification of rice straw was simulated using Aspen Plus™ and compared in terms of their energy, exergy and environmental impacts. It was found that the addition of CO2 had less impact on syngas yield compared with gasification temperature. At lower CO2/Biomass mass ratios (<0.25), CO2-enhanced gasification showed a lower GSE (gasification system efficiency) than conventional gasification, which was below 22.1%. However at higher CO2/Biomass ratios, CO2-enhanced gasification demonstrated higher GSE than conventional gasification. The GSE of CO2-enhanced gasification continued to increase to 58.8% when CO2/Biomass ratio was raised to 0.87. It was also found that chemical exergy was 2.05-4.85 times higher than physical exergy. The syngas exergy increased with CO2 addition, which was mainly due to the increase in physical exergy. The maximum exergy efficiency occurred in the temperature range of 800 °C-900 °C. For CO2-enhanced gasification, exergy efficiency was found to be more sensitive to temperature than CO2/Biomass ratios. In addition, the preliminary environmental analysis showed that CO2-enhanced gasification resulted in significant environmental benefits compared with steam gasification. However novel assessment methodologies are still needed to better evaluate the advantages of CO2 utilization.

AB - In this study, air, steam and CO2-enhanced gasification of rice straw was simulated using Aspen Plus™ and compared in terms of their energy, exergy and environmental impacts. It was found that the addition of CO2 had less impact on syngas yield compared with gasification temperature. At lower CO2/Biomass mass ratios (<0.25), CO2-enhanced gasification showed a lower GSE (gasification system efficiency) than conventional gasification, which was below 22.1%. However at higher CO2/Biomass ratios, CO2-enhanced gasification demonstrated higher GSE than conventional gasification. The GSE of CO2-enhanced gasification continued to increase to 58.8% when CO2/Biomass ratio was raised to 0.87. It was also found that chemical exergy was 2.05-4.85 times higher than physical exergy. The syngas exergy increased with CO2 addition, which was mainly due to the increase in physical exergy. The maximum exergy efficiency occurred in the temperature range of 800 °C-900 °C. For CO2-enhanced gasification, exergy efficiency was found to be more sensitive to temperature than CO2/Biomass ratios. In addition, the preliminary environmental analysis showed that CO2-enhanced gasification resulted in significant environmental benefits compared with steam gasification. However novel assessment methodologies are still needed to better evaluate the advantages of CO2 utilization.

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