Exergy-based parallel between steam- and combined-cycle power plant configurations burning blast furnace gas

Campos, Gustavo Bonolo de; Bringhenti, Cleverson; Tomita, Jesuíno Takachi

doi:10.1504/ijex.2019.099717

Cited by 7 publications

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“…where ex represents total exergy and ex ph and ex ch represent the physical exergy and chemical exergy, respectively. The actual physical exergy of a flowing stream can be calculated from Equation (2):…”

Section: Exergy Calculationmentioning

confidence: 99%

“…The rational utilization of BFG is of great significance for energy conservation and emission reduction [1]. Campos [2] reported an exergy-based comparison between BFG-fueled combined cycle plants and steam cycle plant configurations, providing a method of direct combustion of blast furnace gas for power generation. Campos [3] compared the efficiency of combined cycle and Rankine cycle in BFG utilization, showing that the combined cycle has higher power generation efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Energy and Exergy Analysis on a Blast Furnace Gas-Driven Cascade Power Cycle

et al. 2022

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Blast furnace gas is the major combustible by-product produced in the steel industry, where iron ore is reduced by coke into iron. Direct combustion of blast furnace gas after simple treatment for power generation is a common utilization method nowadays. However, this method suffers from low efficiency and high carbon intensity. The use of gas-steam combined cycle is an excellent method to improve the efficiency of blast furnace gas for power generation. However, there is a problem of insufficient utilization of low product heat, and the addition of CCS system can further reduce the power efficiency. To solve these issues, a new blast furnace gas power generation system with a Brayton cycle with supercritical CO2 and a Rankine cycle with transcritical CO2 is proposed in this work. The new system is then thermodynamically simulated by Aspen Plus, after the sub-modules are validated. The effects of molar ratio of steam to carbon, selexol/CO2 mass ratio, compression ratio, turbine import temperature and turbine inlet pressure on the system are investigated. A comparison is also performed between the new combined cycle system and the traditional combined cycle power generation system. The results show that in the new power generation system, net power efficiency of 53.29%, carbon capture efficiency of 95.78% and sulfur capture rate of 94.46% can be achieved, which is significantly better than the performance of the conventional combined cycle.

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Section: Exergy Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis on a Blast Furnace Gas-Driven Cascade Power Cycle

et al. 2022

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“…The higher the exergy content of source, the lower the exergy efficiency of the system. It was recommended by De Campos, et al, (2019) to burn low-grade fuels in combustion process of power plant. The results from case study analysis demonstrated the exergy efficiency improvement due to employing a heat pump in the system, which was confirmed by the researches done by Dillon, et al, (2019) and Sun, et al, (2012).…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

Exergy analysis of district energy systems and comparison of their exergetic, energetic and environmental performance

Schmidt

Ahmadian

2020

IJEX

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This paper investigates the advantages of performing exergy analysis for thermodynamic systems consisting of a district heating network (DHN) by comparing the exergy performance with energetic and environmental performance of three case studies in Austria. Furthermore, the effect of influential parameters such as energy source type, conversion technology, supply/return temperature and reference temperature on exergy performance of the system was investigated. An initial literature review and analysis of the case studies showed that the most influential factor on exergy performance of a system was the type of energy source and its conversion technology. Although lowering the supply temperature of DHN can increase the exergy efficiency of the system, changing reference temperature did not show a clear relationship with exergy efficiency. Finally, no clear relationship between energy and exergy efficiencies of the system was discovered; nevertheless, the higher the exergy efficiency of a system the lower the direct CO2 emissions from it.

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“…When comparing micro gas turbines with reciprocating engine for small-scale power generation, the former presents lower emissions although achieving a lower efficiency [12]. Considering that the combination of gas turbines with steam Rankine cycles has proven to yield unmatched thermal efficiency at the higher-range of energy production [13], the combination of micro gas turbines with ORCs appropriately designed to avail the low-grade heat of the exhaust shows great potential, especially when considering that gas turbines with smaller power levels benefited the most when combined with ORCs [14].…”

Section: Introductionmentioning

confidence: 99%

A Review on Combining Micro Gas Turbines with Organic Rankine Cycles

et al. 2019

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Current energy conversion machines such as the micro gas turbine can be improved by harvesting the low-grade energy of the exhaust. A prominent option for such is the organic Rankine cycle due to its relatively efficient and reliable design. This manuscript presents a review on the subject and is the first step toward the design of an organic Rankine cycle bottoming a 100 kWe recuperated gas turbine. After introducing and covering the historical development of the technology, appropriate guidelines for defining the cycle arrangement and selecting the fluid are presented. At last, the viability of the cycle is assessed by assuming an appropriate efficiency value and general cost functions. The organic Rankine is expected to generate an additional 16.6 kWe of power, increasing the electrical efficiency from 30 to 35%. However, the capital cost increase was estimated in 48%.

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Exergy-based parallel between steam- and combined-cycle power plant configurations burning blast furnace gas

Cited by 7 publications

References 0 publications

Energy and Exergy Analysis on a Blast Furnace Gas-Driven Cascade Power Cycle

Energy and Exergy Analysis on a Blast Furnace Gas-Driven Cascade Power Cycle

Exergy analysis of district energy systems and comparison of their exergetic, energetic and environmental performance

A Review on Combining Micro Gas Turbines with Organic Rankine Cycles

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