Exergy analysis with a flowsheeting simulator—II. Application; synthesis gas production from natural gas

Hinderink, A.P.; Kerkhof, F.P.J.M.; Lie, A.B.K.; Arons, J. de Swaan; Kooi, Hedzer J. van der

doi:10.1016/0009-2509(96)00221-7

Cited by 44 publications

(23 citation statements)

References 4 publications

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“…Exergy analyses have also been implemented in simulation tools. For example, Hinderink et al integrated the subroutines of exergy calculations with the Aspen Plus flowsheeting simulator for the synthesis gas production from natural gas; Querol et al developed a visual basic application for Microsoft Excel 2007 as a helpful tool to perform mass, energy, exergy and thermoeconomic calculations during the systematic analysis of energy processes simulated with Aspen Plus; Abdollahi‐Demneh et al implemented exergy calculations in Aspen HYSYS; and Baudet et al and Ghannadzadeh et al are implementing exergy analyses in ProSim. The integration of exergy analyses by those tools makes the evaluation of processes easier and straightforward.…”

Section: Final Remarksmentioning

confidence: 99%

“…Exergy analyses have also been implemented in simulation tools. For example, Hinderink et al 60,61 integrated the subroutines of exergy calculations with the Aspen Plus flowsheeting simulator for the synthesis gas production from natural gas; Querol et al 62 developed a visual basic application for 12 Second Law of Thermodynamics rules for reducing energy consumption 1. The driving force of a process must approach zero at all points in a reactor, at all times.…”

Section: Final Remarksmentioning

confidence: 99%

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Exergy as a tool for measuring process intensification in chemical engineering

Luis

2013

J of Chemical Tech & Biotech

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Exergy is defined as the maximum shaft work that can be done in a process to bring the system into equilibrium with the environment. Thus, exergy analyses are the first step to understand where the weak points of processes are. It considers intrinsically the quality of energy: when energy loses its quality, exergy is destroyed. In addition, optimization of processes aiming at the minimization of exergy destruction can be done as a function of the topology and physical characteristics of the system, such as finite dimensions, shapes, materials, finite speeds, and finite‐time intervals of operation, establishing a direct relationship between exergy and process intensification. However, the emphasis on exergy in chemical engineering is still very poor compared with other fields, in spite of being one of the areas in which more exergy is destroyed due to reaction and separation. This paper gives an overview of the current application of exergy analyses in chemical engineering, showing the main fields in which exergy studies are performed and focusing the attention on two critical points of action: separation technologies (distillation and membrane technology) and CO2 capture. New research trends in chemical engineering using exergy as a tool for process intensification are highlighted. © 2013 Society of Chemical Industry

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Section: Final Remarksmentioning

confidence: 99%

Section: Final Remarksmentioning

confidence: 99%

Exergy as a tool for measuring process intensification in chemical engineering

Luis

2013

J of Chemical Tech & Biotech

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“…For the achievement of the conventional methane conversion process, the heat needed for its conversion inside catalytic tubes is provided by burning some of the methane in a furnace. The losses of exergy in the reaction sections of methane-to-synthesis gas conversion plants are estimated by Rosen and Scott (1988), Rosen (1991), Hinderink et al (1996), as 9% to 14% of total input exergy, depending on the scheme considered. When a reformer is included in the power generation cycle this magnitude is reduced to 3%.…”

Section: Resultsmentioning

confidence: 99%

Integrated Scheme of Natural Gas Usage with Minimum Production of Entropy

2002

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A ccording to the second law of thermodynamics, any real industrial process is accompanied by an increase in entropy. An approach to reversible process conditions leads to a lower entropy increase in industrial processes and to more complete employment of feedstock and fuel resources (Ahern, 1980). However, this approach causes a decrease in process rates and an increase in equipment size. These two opposing tendencies should therefore be taken into account when seeking optimal process conditions.The various chemical reactions in industrial units are characterized by substantially different entropy production. In order to attain meaningful energy savings by approaching reversible conditions without noticeable increases in plant dimensions, it is the processes with extremely high entropy production that should be analyzed. One of these is the burning of organic fuels in power generation plants.Gas Turbine Units (GTUs), where the chemical exergy of natural gas (methane) is converted to electricity through consecutive stages of compression, combustion and expansion, are widely used. The goal of this article is to show the principal method to recovering that part of the energy that is wasted in the combustion chambers of the GTU by virtue of the irreversibility of fuel-burning by means of integration with the process of methane conversion into synthesis gas. The thermodynamic efficiencies of the standard GTU scheme and the integrated scheme based on our previous works (Safonov et al., 1993, Granovskii andSafonov, 1995) will be compared. To simplify the comparison of the different GTU cycles, the processes of compression and expansion are considered ideal and adiabatic, heat transfer in the heat exchangers is considered close to reversibility (almost perfect), and the temperatures of the mixing flows are equal. Also, the parameters of gaseous mixtures are calculated using the ideal gas station model. Standard Gas Turbine Cycle.Let us first consider the standard gas-turbine cycle, where electrical energy is derived from methane (natural gas). It has several stages: air compression in a compressor (5), methane combustion with air in a combustion chamber (1), gas expansion in a turbine (2) and heat transfer (3, 4) (Figure 1). The electrical energy, A, generated in the cycle, is:

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“…Some of these have introduced exergy capabilities. For example, Hinderink et al (1996aHinderink et al ( , 1996b have introduced methods for carrying out exergy analysis within a flowsheeting simulator and applied them to synthesis gas production from natural gas.…”

Section: Further Discussionmentioning

confidence: 99%

Size considerations in applications of exergy analysis

Rosen

2008

IJEX

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Considerations related to size of application of exergy analysis are examined. Six size categories are considered: sub-device, device, simple system, complex system, macro system, and planetary-scale system. The boundaries between categories are not sharp. It is concluded that many systems investigated with exergy analysis exhibit size-related trends regarding how exergy analysis is performed, and a size categorisation can identify how exergy analysis can most appropriately be applied. The results can help guide exergy users to the most suitable manner of application for a given system and are expected to improve the usability of exergy analysis and increase its application.

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Exergy analysis with a flowsheeting simulator—II. Application; synthesis gas production from natural gas

Cited by 44 publications

References 4 publications

Exergy as a tool for measuring process intensification in chemical engineering

Exergy as a tool for measuring process intensification in chemical engineering

Integrated Scheme of Natural Gas Usage with Minimum Production of Entropy

Size considerations in applications of exergy analysis

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