Life cycle analysis of coal-based synthetic natural gas for heat supply and electricity generation in China

Gao, Dan; Xu, Qi; Zheng, Xianghao; Zhang, Yuning

doi:10.1016/j.cherd.2017.10.036

Cited by 25 publications

(7 citation statements)

References 38 publications

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“…The IRR is commonly used to evaluate the feasibility of the engineering project. which is expressed as follows 19 , 48 , 49 where C t represents the cash flow of the year t and n denotes the calculation year.…”

Section: Methodsmentioning

confidence: 99%

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Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Ze-fu²,

Zhu³

et al. 2021

ACS Omega

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A novel partial gasification combined cycle (PGCC) system integrating coal partial gasification, oxy-fuel combustion, combined cycle, and CO 2 separation is proposed. The coal–CO 2 partial gasification technology is introduced in the coal gasification unit, and the oxy-fuel combustion technology is employed in the char combustion unit and gas turbine (GT) unit. The thermodynamic and economic analysis of the proposed system is carried out, showing that both energy and exergy efficiency have an increasing/decreasing tendency when the recycled flue gas (RFG) ratio of char combustion and GT increase. When the RFG ratios of char combustion and GT are 0.43 and 0.34, energy and exergy efficiencies reach maximum values of 48.18 and 45.11%, respectively. The energy efficiency of the PGCC-Oxy system is higher than that of the integrated gasification combined cycle (IGCC)-Oxy system by approximately 3%. It can be concluded from the economic analysis that the total investment on the PGCC-Oxy system is 3272.71 million RMB, and the internal rate of return (IRR) and payback time is 8.07% and 12.38 years, respectively.

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Section: Methodsmentioning

confidence: 99%

“…47 The IRR is commonly used to evaluate the feasibility of the engineering project. which is expressed as follows 19,48,49…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Ze-fu²,

Zhu³

et al. 2021

ACS Omega

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“…For this reason, two alternative resources to heat the vegetable oil were considered in an alternative analysis with the aim of evaluating their influence on the sustainability of the overall system. On the one hand, the use of natural gas for power generation is quite significant today, providing a clean technique for the energy supply [ 55 ]. Given that this resource presents the best environmental performance among fossil fuels [ 56 ], it was selected for the assessment.…”

Section: Opportunities For Improvement and Recommendationsmentioning

confidence: 99%

Water–Energy–Food Nexus and Life Cycle Thinking: A New Approach to Environmental and Nutritional Assessment of Potato Chips

Fernández‐Ríos

Cortabitarte

Amo-Setién

et al. 2022

Foods

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The water–energy–food (WEF) nexus has become a key concept to promote the cross-sectoral coordination toward sustainable development. In particular, understanding the interdependences of these pillars, as well as addressing a life cycle perspective, is essential when evaluating food production systems. This study explores the environmental impacts and nutritional quality of potato chips, addressing life cycle thinking and a WEF nexus approach. For this purpose, the combined application of life cycle assessment (LCA) and the Nutrient-Rich Food 9.3 (NRF9.3) index was considered to identify the main environmental hotspots and advanced opportunities. The results indicated a major contribution of the cultivation stage on water use, whereas the processing accounted for most of the impacts in energy-related indicators and eutrophication potentials. Improvement opportunities reside in the joint application of drip irrigation, allowing to achieve important water savings, as well as the use of natural gas or pellets instead of diesel, which constitute cleaner energy sources. On the other hand, a poor nutritional density of potato chips became evident from the quantification of the NRF9.3, which can be significantly improved if potatoes undergo a roasted process instead of frying.

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Section: Introductionmentioning

confidence: 99%

“…Gasification, as one of the key technologies for the clean utilization of coal, has been widely applied in the synthesis of ammonia, methanol, and coal-based synthetic natural gas (SNG) and in Fischer–Tropsch synthesis. , Catalytic gasification, which is considered as the next-generation gasification technology, has been paid more and more attention due to its low gasification temperature, high energy efficiency, and high selectivity to some desired gases. − The catalysts used in catalytic gasification are usually alkali metals, alkaline earth metals, and transition metals, although alkali metals show superior catalytic performance. − However, alkali metals are easy to react with Si and Al minerals in coal to form deactivated alkali metals, which have poor catalytic performance. − Meanwhile, the deactivated alkali metals are usually water-undissolved and cause low alkali recovery. − Both the deactivation and the lower alkali recovery increase the cost of catalytic gasification, and thus alkali deactivation has become one of the key technical bottlenecks for the large-scale application of catalytic gasification. Therefore, deactivation behaviors and efforts to alleviate the deactivation of alkali metals have been intensively focused on. − …”

Section: Introductionmentioning

confidence: 99%

Mechanism of Ca Additive Acting as a Deterrent to Na₂CO₃ Deactivation during Catalytic Coal Gasification

et al. 2019

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The deactivation of Na 2 CO 3 , caused by the reaction between Na and Si and Al minerals in coal, is one of the key technical bottlenecks for the large-scale application of catalytic gasification. Ca can inhibit the deactivation of Na, and the binary Na−Ca catalyst shows strong synergistic effects during catalytic gasification. In this study, the deactivation behaviors of Na 2 CO 3 and the inhibition mechanism of Ca were systematically investigated by thermogravimetric, X-ray diffraction, Fourier transform infrared (FT-IR), model compounds, and FactSage thermodynamic equilibrium. The results show that the Na−Ca catalyst shows synergistic effects and more Na remains active as water-dissolved Na after gasification with Na−Ca addition. The mechanism of the inhibiting effect of Ca on Na 2 CO 3 deactivation at low temperatures (<1000 °C) is different from that at high temperatures (>1000 °C). At temperatures lower than 1000 °C, Ca inhibits the reaction between Na and Si and Al minerals; as a result, more Na remains active during catalytic gasification, which is validated by FT-IR. Meanwhile, the FactSage thermodynamic equilibrium shows that more Na 2 CO 3 exists with increasing Ca addition. With Ca/Si = 0.1, the disappearing temperature of Na 2 CO 3 is 940 °C. When Ca/Si increases to 1, the disappearing temperature of Na 2 CO 3 further increases to 1166 °C, indicating that more Na survives with Ca addition. At high temperatures (>1000 °C), Ca captures Si and a part of Na in priority to form sodium calcium silicate (Na 2 Ca 3 SiO 8 ) and calcium silicate (Ca 2 SiO 4 ). As a result, the remaining Na and Al form NaAlO 2 , which has excellent catalytic performance and contributes to the synergistically promoted catalytic performance. At low and high temperatures, Ca can act as a good deterrent to the Na deactivation.

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Life cycle analysis of coal-based synthetic natural gas for heat supply and electricity generation in China

Cited by 25 publications

References 38 publications

Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Water–Energy–Food Nexus and Life Cycle Thinking: A New Approach to Environmental and Nutritional Assessment of Potato Chips

Mechanism of Ca Additive Acting as a Deterrent to Na₂CO₃ Deactivation during Catalytic Coal Gasification

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Life cycle analysis of coal-based synthetic natural gas for heat supply and electricity generation in China

Cited by 25 publications

References 38 publications

Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Thermodynamic and Economic Analysis of Oxy-Fuel-Integrated Coal Partial Gasification Combined Cycle

Water–Energy–Food Nexus and Life Cycle Thinking: A New Approach to Environmental and Nutritional Assessment of Potato Chips

Mechanism of Ca Additive Acting as a Deterrent to Na2CO3 Deactivation during Catalytic Coal Gasification

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Mechanism of Ca Additive Acting as a Deterrent to Na₂CO₃ Deactivation during Catalytic Coal Gasification