Energy optimization analysis of a thermochemical exhaust gas recuperation system of a gas turbine unit

Dmitry Pashchenko

doi:10.1016/j.enconman.2018.06.057

Energy optimization analysis of a thermochemical exhaust gas recuperation system of a gas turbine unit

Dmitry Pashchenko

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

This article considers the scheme of a gas turbine unit (GTU) with a thermochemical exhaust heat recuperation system by using steam methane reforming. The main concept of thermochemical recuperation (TCR) is the transformation of exhaust gases heat into chemical energy of a new synthetic fuel that has higher calorimetric properties such as low-heating value. As an example, the gas turbine plants with turbines where the exhaust gas temperature exceeds 900 K are considered. To determine the optimum operating parameters of the thermochemical exhaust recuperation system, the influence of temperature, pressure, and inlet reaction mixture composition on the recuperation rate are determined. Based on thermodynamic analysis, the amount of exhaust heat that is transformed into chemical energy of the new synthetic fuel for various operating parameters is calculated. The thermodynamic analysis is performed by minimizing Gibbs energy via the programs IVTANTHERMO and Aspen HYSYS. The results of the thermodynamic analysis are verified with the results obtained by the analytical calculation of other authors based on the law of mass action and the law of mass and energy conservation. As a result of the calculation, it was established that in the temperature range (900–1000) K the recuperation rate reaches a maximum value for the inlet reaction mixture composition of H₂O:CH₄=2; in the temperature range of above 1200 K, at H₂O:CH₄ = 1. It is also established that when the pressure in the reaction space increases, the energy efficiency of the use of TCR is reduced; the optimum pressure is in the range of (5–10) bar. The maximum recuperation rate of the TCR system (R = 0.693) is observed at T = 900 K, β=2, p = 5 bar.

Original language	English
Pages (from-to)	917-924
Number of pages	8
Journal	Energy Conversion and Management
Volume	171
DOIs	https://doi.org/10.1016/j.enconman.2018.06.057
State	Published - 1 Sep 2018
Externally published	Yes

Keywords

Energy efficiency
Exhaust heat
Hydrogen
Steam methane reforming
Synthesis gas
Thermochemical recuperation

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.enconman.2018.06.057

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title = "Energy optimization analysis of a thermochemical exhaust gas recuperation system of a gas turbine unit",

abstract = "This article considers the scheme of a gas turbine unit (GTU) with a thermochemical exhaust heat recuperation system by using steam methane reforming. The main concept of thermochemical recuperation (TCR) is the transformation of exhaust gases heat into chemical energy of a new synthetic fuel that has higher calorimetric properties such as low-heating value. As an example, the gas turbine plants with turbines where the exhaust gas temperature exceeds 900 K are considered. To determine the optimum operating parameters of the thermochemical exhaust recuperation system, the influence of temperature, pressure, and inlet reaction mixture composition on the recuperation rate are determined. Based on thermodynamic analysis, the amount of exhaust heat that is transformed into chemical energy of the new synthetic fuel for various operating parameters is calculated. The thermodynamic analysis is performed by minimizing Gibbs energy via the programs IVTANTHERMO and Aspen HYSYS. The results of the thermodynamic analysis are verified with the results obtained by the analytical calculation of other authors based on the law of mass action and the law of mass and energy conservation. As a result of the calculation, it was established that in the temperature range (900–1000) K the recuperation rate reaches a maximum value for the inlet reaction mixture composition of H2O:CH4=2; in the temperature range of above 1200 K, at H2O:CH4 = 1. It is also established that when the pressure in the reaction space increases, the energy efficiency of the use of TCR is reduced; the optimum pressure is in the range of (5–10) bar. The maximum recuperation rate of the TCR system (R = 0.693) is observed at T = 900 K, β=2, p = 5 bar.",

keywords = "Energy efficiency, Exhaust heat, Hydrogen, Steam methane reforming, Synthesis gas, Thermochemical recuperation",

author = "Dmitry Pashchenko",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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N2 - This article considers the scheme of a gas turbine unit (GTU) with a thermochemical exhaust heat recuperation system by using steam methane reforming. The main concept of thermochemical recuperation (TCR) is the transformation of exhaust gases heat into chemical energy of a new synthetic fuel that has higher calorimetric properties such as low-heating value. As an example, the gas turbine plants with turbines where the exhaust gas temperature exceeds 900 K are considered. To determine the optimum operating parameters of the thermochemical exhaust recuperation system, the influence of temperature, pressure, and inlet reaction mixture composition on the recuperation rate are determined. Based on thermodynamic analysis, the amount of exhaust heat that is transformed into chemical energy of the new synthetic fuel for various operating parameters is calculated. The thermodynamic analysis is performed by minimizing Gibbs energy via the programs IVTANTHERMO and Aspen HYSYS. The results of the thermodynamic analysis are verified with the results obtained by the analytical calculation of other authors based on the law of mass action and the law of mass and energy conservation. As a result of the calculation, it was established that in the temperature range (900–1000) K the recuperation rate reaches a maximum value for the inlet reaction mixture composition of H2O:CH4=2; in the temperature range of above 1200 K, at H2O:CH4 = 1. It is also established that when the pressure in the reaction space increases, the energy efficiency of the use of TCR is reduced; the optimum pressure is in the range of (5–10) bar. The maximum recuperation rate of the TCR system (R = 0.693) is observed at T = 900 K, β=2, p = 5 bar.

AB - This article considers the scheme of a gas turbine unit (GTU) with a thermochemical exhaust heat recuperation system by using steam methane reforming. The main concept of thermochemical recuperation (TCR) is the transformation of exhaust gases heat into chemical energy of a new synthetic fuel that has higher calorimetric properties such as low-heating value. As an example, the gas turbine plants with turbines where the exhaust gas temperature exceeds 900 K are considered. To determine the optimum operating parameters of the thermochemical exhaust recuperation system, the influence of temperature, pressure, and inlet reaction mixture composition on the recuperation rate are determined. Based on thermodynamic analysis, the amount of exhaust heat that is transformed into chemical energy of the new synthetic fuel for various operating parameters is calculated. The thermodynamic analysis is performed by minimizing Gibbs energy via the programs IVTANTHERMO and Aspen HYSYS. The results of the thermodynamic analysis are verified with the results obtained by the analytical calculation of other authors based on the law of mass action and the law of mass and energy conservation. As a result of the calculation, it was established that in the temperature range (900–1000) K the recuperation rate reaches a maximum value for the inlet reaction mixture composition of H2O:CH4=2; in the temperature range of above 1200 K, at H2O:CH4 = 1. It is also established that when the pressure in the reaction space increases, the energy efficiency of the use of TCR is reduced; the optimum pressure is in the range of (5–10) bar. The maximum recuperation rate of the TCR system (R = 0.693) is observed at T = 900 K, β=2, p = 5 bar.

KW - Energy efficiency

KW - Exhaust heat

KW - Hydrogen

KW - Steam methane reforming

KW - Synthesis gas

KW - Thermochemical recuperation

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DO - 10.1016/j.enconman.2018.06.057

M3 - 文章

AN - SCOPUS:85048775209

SN - 0196-8904

VL - 171

SP - 917

EP - 924

JO - Energy Conversion and Management

JF - Energy Conversion and Management

ER -

Energy optimization analysis of a thermochemical exhaust gas recuperation system of a gas turbine unit

Abstract

Keywords

UN SDGs

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