Effects of biomass on dynamics of combustion in circulating fluidized beds

Antti Tourunen (Corresponding Author), Heidi Häsä, Juha Pitsinki, Mikko Jegoroff, Jaakko Saastamoinen, Jouni Hämäläinen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Fludized bed technology is very suitable for the combustion of biomass. Nevertheless substitution of coal with biomass affects boiler operation and especially dynamics and controllability. Non-homogeneity of biomass and fuel feeding disturbances cause process unstability, such as variations in temperatures and pressures, which reduce lifetime of equipment and structures. Because of process unstability higher air coefficient must be used in order to avoid CO emissions, which is not economical. Combustion profiles for coal, wood and peat, measured at the VTT Processes Pilot circulating fluidized bed reactor, have been compared. Process stability and char inventories have been studied by the measurements and the model. Biofuels are usually very reactive and their combustion profiles are quite different compared to coals. Because of high reactivity and low char content combustion process with biofuels is very sensitive for fuel feeding. Also low char inventory effect on load changes combined with combustion profile that differs from coals. Because of different combustion profile heat transfer can be a limiting factor in load changes despite the high reactivity and fast oxygen response.
Original languageEnglish
Pages (from-to)93 - 105
Number of pages13
JournalThermal Science
Volume8
Issue number2
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

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Fluidized beds
Biomass
Coal
Biofuels
Peat
Controllability
Boilers
Wood
Substitution reactions
Heat transfer
Oxygen
Air
Temperature

Cite this

Tourunen, A., Häsä, H., Pitsinki, J., Jegoroff, M., Saastamoinen, J., & Hämäläinen, J. (2004). Effects of biomass on dynamics of combustion in circulating fluidized beds. Thermal Science, 8(2), 93 - 105.
Tourunen, Antti ; Häsä, Heidi ; Pitsinki, Juha ; Jegoroff, Mikko ; Saastamoinen, Jaakko ; Hämäläinen, Jouni. / Effects of biomass on dynamics of combustion in circulating fluidized beds. In: Thermal Science. 2004 ; Vol. 8, No. 2. pp. 93 - 105.
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abstract = "Fludized bed technology is very suitable for the combustion of biomass. Nevertheless substitution of coal with biomass affects boiler operation and especially dynamics and controllability. Non-homogeneity of biomass and fuel feeding disturbances cause process unstability, such as variations in temperatures and pressures, which reduce lifetime of equipment and structures. Because of process unstability higher air coefficient must be used in order to avoid CO emissions, which is not economical. Combustion profiles for coal, wood and peat, measured at the VTT Processes Pilot circulating fluidized bed reactor, have been compared. Process stability and char inventories have been studied by the measurements and the model. Biofuels are usually very reactive and their combustion profiles are quite different compared to coals. Because of high reactivity and low char content combustion process with biofuels is very sensitive for fuel feeding. Also low char inventory effect on load changes combined with combustion profile that differs from coals. Because of different combustion profile heat transfer can be a limiting factor in load changes despite the high reactivity and fast oxygen response.",
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Tourunen, A, Häsä, H, Pitsinki, J, Jegoroff, M, Saastamoinen, J & Hämäläinen, J 2004, 'Effects of biomass on dynamics of combustion in circulating fluidized beds', Thermal Science, vol. 8, no. 2, pp. 93 - 105.

Effects of biomass on dynamics of combustion in circulating fluidized beds. / Tourunen, Antti (Corresponding Author); Häsä, Heidi; Pitsinki, Juha; Jegoroff, Mikko; Saastamoinen, Jaakko; Hämäläinen, Jouni.

In: Thermal Science, Vol. 8, No. 2, 2004, p. 93 - 105.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effects of biomass on dynamics of combustion in circulating fluidized beds

AU - Tourunen, Antti

AU - Häsä, Heidi

AU - Pitsinki, Juha

AU - Jegoroff, Mikko

AU - Saastamoinen, Jaakko

AU - Hämäläinen, Jouni

N1 - Project code: C4SU00036

PY - 2004

Y1 - 2004

N2 - Fludized bed technology is very suitable for the combustion of biomass. Nevertheless substitution of coal with biomass affects boiler operation and especially dynamics and controllability. Non-homogeneity of biomass and fuel feeding disturbances cause process unstability, such as variations in temperatures and pressures, which reduce lifetime of equipment and structures. Because of process unstability higher air coefficient must be used in order to avoid CO emissions, which is not economical. Combustion profiles for coal, wood and peat, measured at the VTT Processes Pilot circulating fluidized bed reactor, have been compared. Process stability and char inventories have been studied by the measurements and the model. Biofuels are usually very reactive and their combustion profiles are quite different compared to coals. Because of high reactivity and low char content combustion process with biofuels is very sensitive for fuel feeding. Also low char inventory effect on load changes combined with combustion profile that differs from coals. Because of different combustion profile heat transfer can be a limiting factor in load changes despite the high reactivity and fast oxygen response.

AB - Fludized bed technology is very suitable for the combustion of biomass. Nevertheless substitution of coal with biomass affects boiler operation and especially dynamics and controllability. Non-homogeneity of biomass and fuel feeding disturbances cause process unstability, such as variations in temperatures and pressures, which reduce lifetime of equipment and structures. Because of process unstability higher air coefficient must be used in order to avoid CO emissions, which is not economical. Combustion profiles for coal, wood and peat, measured at the VTT Processes Pilot circulating fluidized bed reactor, have been compared. Process stability and char inventories have been studied by the measurements and the model. Biofuels are usually very reactive and their combustion profiles are quite different compared to coals. Because of high reactivity and low char content combustion process with biofuels is very sensitive for fuel feeding. Also low char inventory effect on load changes combined with combustion profile that differs from coals. Because of different combustion profile heat transfer can be a limiting factor in load changes despite the high reactivity and fast oxygen response.

M3 - Article

VL - 8

SP - 93

EP - 105

JO - Thermal Science

JF - Thermal Science

SN - 0354-9836

IS - 2

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