Thermodynamic equilibrium analysis of combined dry and steam reforming of propane for thermochemical waste-heat recuperation

Pashchenko, Dmitry

doi:10.1016/j.ijhydene.2017.04.284

Cited by 66 publications

(25 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Anyways, the implementation of ideas embedded in the concept of a digital twin, requires the extensive use of numerical methods of computer modeling and CFDmodeling (Computational Fluid Dynamics) [4]. This method provides the possibility of obtaining a visual representation of the nature of the processes in the object under study and the possibility of investigating its various designs without creating expensive experimental installations.…”

Section: Introductionmentioning

confidence: 99%

Methods of computational modeling of coronary heart vessels for its digital twin

Naplekov

Zheleznikov

Pashchenko

et al. 2018

MATEC Web of Conferences

Self Cite

View full text Add to dashboard Cite

Abstract. In this work, methods of numerical modelling of the coronary vessels system of the human heart have been studied. This investigation includes transient flow of the liquid -blood and dynamics of zones of shear stress at vessels. The main goal of the research is obtaining of hemodynamic and shear stress for creating the digital twin of coronary heart vessels. The results were obtained for low Reynolds numbers about 20 of three-dimensional laminar flow. With this Reynolds number the turbulent flow of the blood is modelled by Realizable k-ε model, and SST models to the narrowing, expansions, and blocks inside the vessels. Loads caused by the additional energy consumption because of the turbulent flow of the blood (increase in arterial blood pressure) have been analyzed. A twodimensional model of a separated vessel with fixed blood back-flow prevention is developed. Presence of a turbulent flow core is discovered. By the means of stress-strain properties of the model, visual representation of the wearing process of the blood back-flow preventer, and heart diseases progression is obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Methods of computational modeling of coronary heart vessels for its digital twin

Naplekov

Zheleznikov

Pashchenko

et al. 2018

MATEC Web of Conferences

Self Cite

View full text Add to dashboard Cite

show abstract

“…The thermodynamic analysis makes it possible to determine the limiting (equilibrium) synfuel compositions by using the method of Gibbs free energy minimization (GFEM). The basic concept of GFEM is built on the principle that the thermochemical system is thermodynamically favorable when its total Gibbs energy is at its minimum value and its differential is zero for each pressure and temperature . The basic concept of GFEM can be written as

{((), d G^{t})}_{T, p} = 0 .

…”

Section: Methodsmentioning

confidence: 99%

“…The algorithm of the determination of total Gibbs energy was discussed in the author's previous work . The resulting equation for determination of total Gibbs energy is defined as follows:

G^{t} = \sum n_{i} normalΔ G_{f i}^{0} = \sum n_{i} R T \ln ((), \frac{f_{i}}{f_{i}^{0}}),

where G t is the total Gibbs free energy as a function on a temperature; n i is the number of moles of element i ;

G_{f i}^{0}

is the standard Gibbs energy of formation of element i ; R is the molar gas constant; T is the temperature; f i is the fugacity of pure element i ; and

f_{i}^{0}

is fugacity of pure element i at the standard state.…”

Section: Methodsmentioning

confidence: 99%

Thermochemical waste-heat recuperation by steam methane reforming with flue gas addition

Pashchenko

2019

Int J Energy Res

Self Cite

View full text Add to dashboard Cite

Summary The process flow schematic of fuel‐consuming equipment with thermochemical waste‐heat recuperation by steam methane reforming with an addition of flue gas to the reaction mixture is suggested. The advantages of such a thermochemical recuperation (TCR) system compared with the TCR system by steam methane reforming are shown and justified. Based on the first law energy analysis, the heat inputs and outputs of the TCR system were determined. To determine the exhaust gases heat transformed into chemical energy of a new synthetic fuel, the thermodynamic analysis by minimizing Gibbs energy via Aspen HYSYS was performed. It was found that with an increase in the mole fraction of combustion products in the reaction mixture, the enthalpy of the methane reforming reaction increases, especially noticeable at the temperature range above 1000 K. Based on the heat, balance of the TCR system was established that the addition of combustion products to the reaction mixture has the following effects: reducing the heat input for steam production in a steam generator; reduction of the steam generator size because of the need to produce a smaller amount of steam in comparison with TCR by pure steam methane reforming; and reducing the amount of heat transferred through the wall of the reformer and, as a consequence, reduction in size of the reformer.

show abstract

“…To model the chemical regenerators, the focus should be placed on calculating the heat absorbed by chemical endothermic reactions and the compositions out of chemical reformers. So far, various chemical endothermic reactions have been used for thermochemical waste heat recuperation [36][37][38][39][40]. Steam reforming experiments of methane [34], methanol, and dimethyl ether [41] have been carried out to obtain characteristics data under some working conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Design and Performance Calculation of the Thermochemical Reformers

Pan

Cheng

et al. 2019

Energies

View full text Add to dashboard Cite

Thermodynamic design methods and performance calculation models for chemical reformers that can be used to recuperate exhaust heat and to improve combustion quality are investigated in this paper. The basic structure of the chemical reformer is defined as series-wound reforming units that consist of heat exchangers and cracking reactors. The CH4-steam reforming reaction is used in the chemical reformers and a universal model of this reaction is built based on the minimization of Gibbs free energy method. Comparative analyzes between the results of the calculation and a plasma-catalyzed CH4-steam reforming reaction experiment verify that this universal model is applicable and has high precision. Algorithms for simulation of series-wound reforming units are constructed and the complexity of the chemical reformers is studied. A design principle that shows the influence of structural complexity on the quantity of recovered heat and the composites of the reformed fuel can be followed for different application scenarios of chemical reformers.

show abstract

Thermodynamic equilibrium analysis of combined dry and steam reforming of propane for thermochemical waste-heat recuperation

Cited by 66 publications

References 71 publications

Methods of computational modeling of coronary heart vessels for its digital twin

Methods of computational modeling of coronary heart vessels for its digital twin

Thermochemical waste-heat recuperation by steam methane reforming with flue gas addition

Thermodynamic Design and Performance Calculation of the Thermochemical Reformers

Contact Info

Product

Resources

About