Bio-DME production based on conventional and CO2-enhanced gasification of biomass: A comparative study on exergy and environmental impacts

Ashak Mahmud Parvez; Tao Wu; Sheng Li; Nick Miles; Iqbal M. Mujtaba

doi:10.1016/j.biombioe.2018.01.016

Bio-DME production based on conventional and CO₂-enhanced gasification of biomass: A comparative study on exergy and environmental impacts

Ashak Mahmud Parvez, Tao Wu, Sheng Li, Nick Miles, Iqbal M. Mujtaba

Department of Chemical and Environmental Engineering

Research output: Journal Publication › Article › peer-review

37 Citations (Scopus)

Abstract

In this study, a novel single-step synthesis of dimethyl ether (DME) based on CO₂-enhanced biomass gasification was proposed and simulated using ASPEN Plus™ modelling. The exergetic and environmental evaluation was performed in comparison with a conventional system. It was found that the fuel energy efficiency, plant energy efficiency and plant exergetic efficiency of the CO₂-enhanced system were better than those of the conventional system. The novel process produced 0.59 kg of DME per kg of gumwood with an overall plant energy efficiency of 65%, which were 28% and 5% higher than those of conventional systems, respectively. The overall exergetic efficiency of the CO₂-enhanced system was also 7% higher. Exergetic analysis of each individual process unit in both the CO₂-enhanced system and conventional systems showed that the largest loss occurred at gasification unit. However, the use of CO₂ as gasifying agent resulted in a reduced loss at gasifier by 15%, indicating another advantage of the proposed system. In addition, the life cycle assessment (LCA) analysis showed that the use of CO₂ as gasifying agent could also result in less environmental impacts compared with conventional systems, which subsequently made the CO₂-enhanced system a promising option for a more environmental friendly synthesis of bio-DME.

Original language	English
Pages (from-to)	105-113
Number of pages	9
Journal	Biomass and Bioenergy
Volume	110
DOIs	https://doi.org/10.1016/j.biombioe.2018.01.016
Publication status	Published - Mar 2018

Keywords

Bio-DME
CO-enhanced gasification
Conventional gasification
Environmental analysis
Exergy analysis

ASJC Scopus subject areas

Forestry
Renewable Energy, Sustainability and the Environment
Agronomy and Crop Science
Waste Management and Disposal

UN SDGs

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

Access to Document

10.1016/j.biombioe.2018.01.016

Cite this

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title = "Bio-DME production based on conventional and CO2-enhanced gasification of biomass: A comparative study on exergy and environmental impacts",

abstract = "In this study, a novel single-step synthesis of dimethyl ether (DME) based on CO2-enhanced biomass gasification was proposed and simulated using ASPEN Plus{\texttrademark} modelling. The exergetic and environmental evaluation was performed in comparison with a conventional system. It was found that the fuel energy efficiency, plant energy efficiency and plant exergetic efficiency of the CO2-enhanced system were better than those of the conventional system. The novel process produced 0.59 kg of DME per kg of gumwood with an overall plant energy efficiency of 65%, which were 28% and 5% higher than those of conventional systems, respectively. The overall exergetic efficiency of the CO2-enhanced system was also 7% higher. Exergetic analysis of each individual process unit in both the CO2-enhanced system and conventional systems showed that the largest loss occurred at gasification unit. However, the use of CO2 as gasifying agent resulted in a reduced loss at gasifier by 15%, indicating another advantage of the proposed system. In addition, the life cycle assessment (LCA) analysis showed that the use of CO2 as gasifying agent could also result in less environmental impacts compared with conventional systems, which subsequently made the CO2-enhanced system a promising option for a more environmental friendly synthesis of bio-DME.",

keywords = "Bio-DME, CO-enhanced gasification, Conventional gasification, Environmental analysis, Exergy analysis",

author = "Parvez, {Ashak Mahmud} and Tao Wu and Sheng Li and Nick Miles and Mujtaba, {Iqbal M.}",

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doi = "10.1016/j.biombioe.2018.01.016",

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AU - Parvez, Ashak Mahmud

AU - Wu, Tao

AU - Li, Sheng

AU - Miles, Nick

AU - Mujtaba, Iqbal M.

PY - 2018/3

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AB - In this study, a novel single-step synthesis of dimethyl ether (DME) based on CO2-enhanced biomass gasification was proposed and simulated using ASPEN Plus™ modelling. The exergetic and environmental evaluation was performed in comparison with a conventional system. It was found that the fuel energy efficiency, plant energy efficiency and plant exergetic efficiency of the CO2-enhanced system were better than those of the conventional system. The novel process produced 0.59 kg of DME per kg of gumwood with an overall plant energy efficiency of 65%, which were 28% and 5% higher than those of conventional systems, respectively. The overall exergetic efficiency of the CO2-enhanced system was also 7% higher. Exergetic analysis of each individual process unit in both the CO2-enhanced system and conventional systems showed that the largest loss occurred at gasification unit. However, the use of CO2 as gasifying agent resulted in a reduced loss at gasifier by 15%, indicating another advantage of the proposed system. In addition, the life cycle assessment (LCA) analysis showed that the use of CO2 as gasifying agent could also result in less environmental impacts compared with conventional systems, which subsequently made the CO2-enhanced system a promising option for a more environmental friendly synthesis of bio-DME.

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