Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants

Natural gas-fired combined cycle power plants (NGCC) have the advantages of high efficiency and low CO2 intensity compared to coal-fired power plants. When variable renewable energy sources are introduced to the grid in large quantities, the NGCC is expected to have rapid start-ups, rapid shutdowns,...

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Autores principales:	Kotaro NAKAMURA, Takehiko MURAMATSU, Takashi OGAWA, Takao NAKAGAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	eley-rideal reaction ammonia oxidation flue gas denitrification adsorption-desorption flexible operation of thermal power plant Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/0122ee48bab7412d87a209de24164242
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spelling	oai:doaj.org-article:0122ee48bab7412d87a209de241642422021-11-29T05:59:26ZKinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants2187-974510.1299/mej.20-00103https://doaj.org/article/0122ee48bab7412d87a209de241642422020-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_20-00103/_pdf/-char/enhttps://doaj.org/toc/2187-9745Natural gas-fired combined cycle power plants (NGCC) have the advantages of high efficiency and low CO2 intensity compared to coal-fired power plants. When variable renewable energy sources are introduced to the grid in large quantities, the NGCC is expected to have rapid start-ups, rapid shutdowns, and increased partialload operations to stabilize the grid. Due to these temporary operations, the ratio of NO2/NOX in the NGCC exhaust gas changes significantly. In general, when the NO2/NOX ratio is high, the efficiency of the de-NOX systems decreases. Moreover, the performance of de-NOX systems has a transient response due to changes at the catalyst surface and the adsorption of NH3. Considering the trajectory of increased variable renewable energy, it is necessary to develop an efficient NOx removal system that is effective over a wide range of NO2/NOX ratios. In the modeling of de-NOX system performance, this study extends the general Eley-Rideal reaction between adsorbed NH3 and gas-phase NOX to include the existence of O2, H2O, CO2, and transient NO2 in the exhaust gas along with changes in redox sites (i.e., V5+=O and V4+-OH). A two-dimensional transient numerical simulation code was developed and adapted using experimental results obtained from treating simulated NGCC exhaust gas using a commercial honeycomb-shaped selective catalyst. Numerical simulations incorporating the empirically determined kinetic equations accurately predict the transient and equilibrium concentrations of NOX and NH3 exiting a honeycomb catalyst even under gas conditions including high NO2.Kotaro NAKAMURATakehiko MURAMATSUTakashi OGAWATakao NAKAGAKIThe Japan Society of Mechanical Engineersarticleeley-rideal reactionammonia oxidationflue gas denitrificationadsorption-desorptionflexible operation of thermal power plantMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 20-00103-20-00103 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	eley-rideal reaction ammonia oxidation flue gas denitrification adsorption-desorption flexible operation of thermal power plant Mechanical engineering and machinery TJ1-1570
spellingShingle	eley-rideal reaction ammonia oxidation flue gas denitrification adsorption-desorption flexible operation of thermal power plant Mechanical engineering and machinery TJ1-1570 Kotaro NAKAMURA Takehiko MURAMATSU Takashi OGAWA Takao NAKAGAKI Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants
description	Natural gas-fired combined cycle power plants (NGCC) have the advantages of high efficiency and low CO2 intensity compared to coal-fired power plants. When variable renewable energy sources are introduced to the grid in large quantities, the NGCC is expected to have rapid start-ups, rapid shutdowns, and increased partialload operations to stabilize the grid. Due to these temporary operations, the ratio of NO2/NOX in the NGCC exhaust gas changes significantly. In general, when the NO2/NOX ratio is high, the efficiency of the de-NOX systems decreases. Moreover, the performance of de-NOX systems has a transient response due to changes at the catalyst surface and the adsorption of NH3. Considering the trajectory of increased variable renewable energy, it is necessary to develop an efficient NOx removal system that is effective over a wide range of NO2/NOX ratios. In the modeling of de-NOX system performance, this study extends the general Eley-Rideal reaction between adsorbed NH3 and gas-phase NOX to include the existence of O2, H2O, CO2, and transient NO2 in the exhaust gas along with changes in redox sites (i.e., V5+=O and V4+-OH). A two-dimensional transient numerical simulation code was developed and adapted using experimental results obtained from treating simulated NGCC exhaust gas using a commercial honeycomb-shaped selective catalyst. Numerical simulations incorporating the empirically determined kinetic equations accurately predict the transient and equilibrium concentrations of NOX and NH3 exiting a honeycomb catalyst even under gas conditions including high NO2.
format	article
author	Kotaro NAKAMURA Takehiko MURAMATSU Takashi OGAWA Takao NAKAGAKI
author_facet	Kotaro NAKAMURA Takehiko MURAMATSU Takashi OGAWA Takao NAKAGAKI
author_sort	Kotaro NAKAMURA
title	Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants
title_short	Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants
title_full	Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants
title_fullStr	Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants
title_full_unstemmed	Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants
title_sort	kinetic model of scr catalyst-based de-nox reactions including surface oxidation by no2 for natural gas-fired combined cycle power plants
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/0122ee48bab7412d87a209de24164242
work_keys_str_mv	AT kotaronakamura kineticmodelofscrcatalystbaseddenoxreactionsincludingsurfaceoxidationbyno2fornaturalgasfiredcombinedcyclepowerplants AT takehikomuramatsu kineticmodelofscrcatalystbaseddenoxreactionsincludingsurfaceoxidationbyno2fornaturalgasfiredcombinedcyclepowerplants AT takashiogawa kineticmodelofscrcatalystbaseddenoxreactionsincludingsurfaceoxidationbyno2fornaturalgasfiredcombinedcyclepowerplants AT takaonakagaki kineticmodelofscrcatalystbaseddenoxreactionsincludingsurfaceoxidationbyno2fornaturalgasfiredcombinedcyclepowerplants
_version_	1718407565474267136

Kinetic model of SCR catalyst-based de-NOx reactions including surface oxidation by NO2 for natural gas-fired combined cycle power plants

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