Thermodynamic analysis of a directly heated oxyfuel supercritical power system

Chowdhury, A. S. M. Arifur; Bugarin, Luz; Badhan, Antara; Choudhuri, Ahsan; Love, Norman

doi:10.1016/j.apenergy.2016.06.148

Cited by 14 publications

(4 citation statements)

References 30 publications

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“…Methane, the primary component of natural gas, has a low carbon-to-hydrogen ratio, resulting in lower emissions of carbon and particulates (Zhang et al 2022 ). Compressed methane has a specific volume of around 0.0008 m 3 /kg (Chowdhury et al 2016 ). Compressed natural gas is created by compressing regular natural gas to less than 1% of its volume at normal atmospheric pressure and has a high heat of combustion of 47.5 MJ/kg.…”

Section: Green Solutions For Home Heatingmentioning

confidence: 99%

Strategies to save energy in the context of the energy crisis: a review

et al. 2023

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New technologies, systems, societal organization and policies for energy saving are urgently needed in the context of accelerated climate change, the Ukraine conflict and the past coronavirus disease 2019 pandemic. For instance, concerns about market and policy responses that could lead to new lock-ins, such as investing in liquefied natural gas infrastructure and using all available fossil fuels to compensate for Russian gas supply cuts, may hinder decarbonization efforts. Here we review energy-saving solutions with a focus on the actual energy crisis, green alternatives to fossil fuel heating, energy saving in buildings and transportation, artificial intelligence for sustainable energy, and implications for the environment and society. Green alternatives include biomass boilers and stoves, hybrid heat pumps, geothermal heating, solar thermal systems, solar photovoltaics systems into electric boilers, compressed natural gas and hydrogen. We also detail case studies in Germany which is planning a 100% renewable energy switch by 2050 and developing the storage of compressed air in China, with emphasis on technical and economic aspects. The global energy consumption in 2020 was 30.01% for the industry, 26.18% for transport, and 22.08% for residential sectors. 10–40% of energy consumption can be reduced using renewable energy sources, passive design strategies, smart grid analytics, energy-efficient building systems, and intelligent energy monitoring. Electric vehicles offer the highest cost-per-kilometer reduction of 75% and the lowest energy loss of 33%, yet battery-related issues, cost, and weight are challenging. 5–30% of energy can be saved using automated and networked vehicles. Artificial intelligence shows a huge potential in energy saving by improving weather forecasting and machine maintenance and enabling connectivity across homes, workplaces, and transportation. For instance, 18.97–42.60% of energy consumption can be reduced in buildings through deep neural networking. In the electricity sector, artificial intelligence can automate power generation, distribution, and transmission operations, balance the grid without human intervention, enable lightning-speed trading and arbitrage decisions at scale, and eliminate the need for manual adjustments by end-users.

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Section: Green Solutions For Home Heatingmentioning

confidence: 99%

Strategies to save energy in the context of the energy crisis: a review

et al. 2023

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“…Chowdhury et al [9] conducted a study on the Allam cycle using Aspen HYSYS. The thermodynamic properties have been determined through the Lee-Kesler-Plocker equation of state (EoS) [20,21].…”

Section: Natural Gas-based Allam Cyclementioning

confidence: 99%

“…The ASU is a high energy consumption system; nevertheless, the oxy-fuel combustion maintains similar/higher efficiency levels with respect to air-fired power systems [9].…”

Section: Introductionmentioning

confidence: 99%

The Allam Cycle: A Review of Numerical Modeling Approaches

Reale

2023

Energies

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In recent years supercritical CO2 power plants have seen a growing interest in a wide range of applications (e.g., nuclear, waste heat recovery, solar concentrating plants). The Allam Cycle, also known as the Allam-Fetvedt or NET Power cycle, seems to be one of the most interesting direct-fired sCO2 cycles. It is a semi-closed loop, high-pressure, low-pressure ratio, recuperated, direct-fired with oxy-combustion, trans-critical Brayton cycle. Numerical simulations play a key role in the study of this novel cycle. For this reason, the aim of this review is to offer the reader a wide array of modeling solutions, emphasizing the ones most frequently employed and endeavoring to provide guidance on which choices seem to be deemed most appropriate. Furthermore, the review also focuses on the system’s performance and on the opportunities related to the integration of the Allam cycle with a series of processes, e.g., cold energy storage, LNG regasification, biomass or coal gasification, and ammonia production.

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“…An unprecedented increase in the amount of MSW is observed in all over the world, especially for the populous development countries, such as India and China due to the population growth, rapid urbanization, and industrialization [2,3]. It is reported that about 1.70-1.90 billion metric tons per year of MSW is produced in the world [4]. In China, the MSW delivering quantity had grown to 0.20 billion metric tons in 2016 [5].…”

Section: Introductionmentioning

confidence: 99%

Formation and Transformation of Typical Pollutant from MSW by Hydrothermal Carbonization towards Biofuel Hydrochar Production

Jiao¹,

Peng²,

Liu³

2021

Renewable Energy - Technologies and Applications

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An unprecedented increase in municipal solid waste (MSW) is increasingly attractive in response to waste-to-energy. MSW pretreatment is an essential step due to the inherent properties of MSW. Hydrothermal carbonization (HTC) offers an efficient approach for converting MSW into carbonaceous hydrochars. In this chapter, the formation and transformation of heavy metals and polycyclic aromatic hydrocarbons (PAHs) during HTC of MSW were determined. The results indicated that HTC can homogenize the density and size of MSW and also increase carbon content. Moreover, the concentrations of heavy metals in the leachates of the hydrochars were lower than the United States Environmental Protection Agency (US EPA) maximum limits. Compared to MSW, the concentrations of Cr, Cd, Hg, and Zn in the hydrochars were low and the concentrations of Pb, As, Ni, and Cu were high. The concentrations of PAHs in the hydrochars increased with increasing temperature in the range of 1298.71–177698.20 μg/kg, which were much higher than that in MSW, except for H-160. The dominant PAH rings in MSW and the hydrochars were four-ring PAHs and three-ring PAHs, respectively. These findings suggest that 180°C is an appropriate hydrothermal temperature to reduce heavy metals and the toxicity PAHs of MSW.

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Thermodynamic analysis of a directly heated oxyfuel supercritical power system

Cited by 14 publications

References 30 publications

Strategies to save energy in the context of the energy crisis: a review

Strategies to save energy in the context of the energy crisis: a review

The Allam Cycle: A Review of Numerical Modeling Approaches

Formation and Transformation of Typical Pollutant from MSW by Hydrothermal Carbonization towards Biofuel Hydrochar Production

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