Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics

One of the effective solutions to reduce CO2 emission derived from fossil fuels is the suppression of coal consumption in industrial boilers and power plants. Torrefaction is one of the promising treatments for reforming conventional solid biofuels, and torrefied solid biofuels have come to attract...

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Autores principales:	Fumiya MORIYAMA, Satoru MIZUNO, Nami TAGAMI-KANADA, Toru SAWAI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	biomass solid biofuels torrefaction kinetic analysis heating value isothermal pyrolysis Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/aaa75242ba074a059b3669cf78691a7b
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spelling	oai:doaj.org-article:aaa75242ba074a059b3669cf78691a7b2021-11-29T06:07:02ZEvaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics2187-974510.1299/mej.21-00069https://doaj.org/article/aaa75242ba074a059b3669cf78691a7b2021-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/3/8_21-00069/_pdf/-char/enhttps://doaj.org/toc/2187-9745One of the effective solutions to reduce CO2 emission derived from fossil fuels is the suppression of coal consumption in industrial boilers and power plants. Torrefaction is one of the promising treatments for reforming conventional solid biofuels, and torrefied solid biofuels have come to attract attention as an alternative to coal. When torrefied solid biofuels are utilized or produced, energy properties such as higher heating value (HHV) and energy yield of torrefied solid biofuels are quite important. In this study, to evaluate the energy properties for a given pyrolysis condition analytically, evaluation methods of HHV and mass yield of torrefied biomass based on isothermal pyrolysis kinetics are investigated for three biomass species, i) softwood; Japanese cedar, ii) hardwood; castanopsis and iii) herbaceous biomass; rice straw. There are two aims of the study. One is to present the HHV evaluation method by lumped-parameter pyrolysis kinetic models with high evaluation accuracy. The reduction in the mass yield due to torrefaction can be evaluated by the two-step pyrolysis kinetic model, and the HHV is provided with the mass fractions and heating values for constituent substances included in torrefied biomass of the two-step pyrolysis kinetic model. The other is to present the simple correlation to evaluate HHV without depending on three biomass species. From the comparison between the HHV evaluation method and experimental data, it is clarified that the proposed HHV evaluation method based on the two-step pyrolysis kinetic model can be useful to evaluate the HHV of torrefied biomass for three biomass samples with high evaluation accuracy, 5% or less. The linear correlation between HHV enhancement factor and mass yield of torrefied biomass is found regardless of three biomass species in the range of torrefaction mass yield larger than 0.6.Fumiya MORIYAMASatoru MIZUNONami TAGAMI-KANADAToru SAWAIThe Japan Society of Mechanical Engineersarticlebiomasssolid biofuelstorrefactionkinetic analysisheating valueisothermal pyrolysisMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 3, Pp 21-00069-21-00069 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	biomass solid biofuels torrefaction kinetic analysis heating value isothermal pyrolysis Mechanical engineering and machinery TJ1-1570
spellingShingle	biomass solid biofuels torrefaction kinetic analysis heating value isothermal pyrolysis Mechanical engineering and machinery TJ1-1570 Fumiya MORIYAMA Satoru MIZUNO Nami TAGAMI-KANADA Toru SAWAI Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics
description	One of the effective solutions to reduce CO2 emission derived from fossil fuels is the suppression of coal consumption in industrial boilers and power plants. Torrefaction is one of the promising treatments for reforming conventional solid biofuels, and torrefied solid biofuels have come to attract attention as an alternative to coal. When torrefied solid biofuels are utilized or produced, energy properties such as higher heating value (HHV) and energy yield of torrefied solid biofuels are quite important. In this study, to evaluate the energy properties for a given pyrolysis condition analytically, evaluation methods of HHV and mass yield of torrefied biomass based on isothermal pyrolysis kinetics are investigated for three biomass species, i) softwood; Japanese cedar, ii) hardwood; castanopsis and iii) herbaceous biomass; rice straw. There are two aims of the study. One is to present the HHV evaluation method by lumped-parameter pyrolysis kinetic models with high evaluation accuracy. The reduction in the mass yield due to torrefaction can be evaluated by the two-step pyrolysis kinetic model, and the HHV is provided with the mass fractions and heating values for constituent substances included in torrefied biomass of the two-step pyrolysis kinetic model. The other is to present the simple correlation to evaluate HHV without depending on three biomass species. From the comparison between the HHV evaluation method and experimental data, it is clarified that the proposed HHV evaluation method based on the two-step pyrolysis kinetic model can be useful to evaluate the HHV of torrefied biomass for three biomass samples with high evaluation accuracy, 5% or less. The linear correlation between HHV enhancement factor and mass yield of torrefied biomass is found regardless of three biomass species in the range of torrefaction mass yield larger than 0.6.
format	article
author	Fumiya MORIYAMA Satoru MIZUNO Nami TAGAMI-KANADA Toru SAWAI
author_facet	Fumiya MORIYAMA Satoru MIZUNO Nami TAGAMI-KANADA Toru SAWAI
author_sort	Fumiya MORIYAMA
title	Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics
title_short	Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics
title_full	Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics
title_fullStr	Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics
title_full_unstemmed	Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics
title_sort	evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/aaa75242ba074a059b3669cf78691a7b
work_keys_str_mv	AT fumiyamoriyama evaluationofenergypropertiesoftorrefiedbiomassforagivenpyrolysisconditionbyisothermalpyrolysiskinetics AT satorumizuno evaluationofenergypropertiesoftorrefiedbiomassforagivenpyrolysisconditionbyisothermalpyrolysiskinetics AT namitagamikanada evaluationofenergypropertiesoftorrefiedbiomassforagivenpyrolysisconditionbyisothermalpyrolysiskinetics AT torusawai evaluationofenergypropertiesoftorrefiedbiomassforagivenpyrolysisconditionbyisothermalpyrolysiskinetics
_version_	1718407605080031232

Evaluation of energy properties of torrefied biomass for a given pyrolysis condition by isothermal pyrolysis kinetics

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