Thermodynamic and environmental analysis of integrated supercritical water gasification of coal for power and hydrogen production

[Display omitted] •A novel integrated supercritical water gasification of coal is simulated by Aspen Plus.•Energy efficiency of the system is improved by using organic Rankine cycle.•Life cycle environmental performance of the system is evaluated by Simapro.•Thermodynamic and environmental performan...

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Bibliographic Details
Published in:Energy conversion and management 2019-10, Vol.198, p.111927, Article 111927
Main Authors: Chen, Jingwei, Xu, Wenwen, Zhang, Feng, Zuo, Hongyan, E, Jiaqiang, Wei, Kexiang, Liao, Gaoliang, Fan, Yi
Format: Article
Language:English
Subjects:
Acidification
Carbon dioxide
Carbon sequestration
Climate change
Coal
Coal gasification
Coal utilization
Electric power generation
Energy dissipation
Energy efficiency
Energy loss
Environmental assessment
Environmental impact
Environmental performance
Exergy
Gasification
Global warming
Heat exchangers
Hydrogen production
Integrated gasification combined cycle
Life cycle analysis
Life cycle assessment
Life cycles
Nitrogen oxides
Oxides
Photochemicals
Power and hydrogen production
Rankine cycle
Sulfur
Sulfur dioxide
Supercritical water gasification
Temperature
Thermal power
Thermodynamic analysis
Water pollution
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Summary:[Display omitted] •A novel integrated supercritical water gasification of coal is simulated by Aspen Plus.•Energy efficiency of the system is improved by using organic Rankine cycle.•Life cycle environmental performance of the system is evaluated by Simapro.•Thermodynamic and environmental performance is competitive with other technologies. Coal combustion for thermal power generation causes serious environmental problems. Relatively efficient and clean coal utilization technologies need to be developed to alleviate the growing energy crisis and environmental pollution pressure. A novel integrated supercritical water gasification of coal system with 40 t/h throughput of coal and water was designed. A thermodynamic analysis and a life cycle environmental assessment under different conditions were performed using Aspen Plus 8.4 and SimaPro 9.0 based on the Ecoinvent 3 database, respectively. Results show that the maximum energy loss is induced by the waste heat of the effluent from the heat exchanger. By using organic Rankine cycle, the energy efficiency of the system could reach 53.3% when the temperature and coal concentration are 700 °C and 15 wt%, respectively. The global warming potential, acidification potential and nitrogen oxides are 0.058 kg carbon dioxide eq/(kW·h), 3.63 × 10−4 kg sulfur dioxide eq/(kW·h) and 7.04 × 10−5 nitrogen oxides eq/(kW·h), respectively, for the process combined with carbon dioxide capture and storage under the temperature of 700 °C and the coal concentration of 15 wt%. The comparison of the thermodynamic and environmental performance among different systems shows that the exergy and energy efficiencies of integrated supercritical water gasification of coal system combined with organic Rankine cycle are higher than those of integrated gasification combined cycle, and the environmental emissions of the integrated supercritical water gasification of coal system are less than those of integrated gasification combined cycle system. This study reveals that the integrated supercritical water gasification of coal is a relatively clean and efficient coal utilization technology with good industrialization prospects.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2019.111927