Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Oxyfuel combustion with CO2 capture is a considerable option for reduction of greenhouse gas emissions. Circulating fluidized bed (CFB) technology appears to be well suited to oxyfuel combustion. In order to study the differences in combustion phenomena and emission formation in air and oxyfuel combustion, the fuel pyrolysis and char combustion tests were performed with VTT’s bench scale bubbling fluidized bed reactor. In total seven fuels (Spanish anthracite, petroleum coke, Polish bituminous coal, Spanish lignite, South-African bituminous coal, wood chips, and straw pellet) were selected for these experiments. Three fuel batches were fed one at the time into reactor and pyrolyzed in sand bed. This was done for each fuel both in N2 and CO2 atmosphere. After the complete pyrolysis, gas was switched to 10% of O2 and the remaining char was combusted. The gas evolution was measured with FTIR and on-line analysers. Char converted mostly to CO2 in N2 environment. In the CO2 environment a high amount of CO formed compared to N2 environment. The total SO2 conversion increased in oxyfuel conditions compared to air combustion conditions. The effect of combustion gas on nitrogen emission formation appeared to be highly dependent on the fuel volatile and nitrogen content. More N2O and less NO were detected during the pyrolysis in CO2 atmosphere compared to N2 atmosphere. From the experimental data, conversion of different species during the pyrolysis and char combustion can be obtained. The conversion parameters can be used in furnace sub-models to design optimal boiler configuration. The overall results can be applied in the development of the flexible air/oxy CFB concept.
Original languageEnglish
Title of host publication21st International Conference on Fluidized Bed Combustion Proceedings
Place of PublicationNapoli, Italia
Pages463-470
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event21st International Conference on Fluidized Bed Combustion, 21FBC - Napoli, Italy
Duration: 3 Jun 20126 Jun 2012

Conference

Conference21st International Conference on Fluidized Bed Combustion, 21FBC
Abbreviated title21FBC
CountryItaly
CityNapoli
Period3/06/126/06/12

Fingerprint

Fluidized beds
Pyrolysis
Air
Bituminous coal
Gases
Nitrogen
Petroleum coke
Anthracite
Straw
Lignite
Gas emissions
Greenhouse gases
Boilers
Wood
Furnaces
Sand
Experiments

Cite this

Saastamoinen, H., Leino, T., & Tourunen, A. (2012). Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed. In 21st International Conference on Fluidized Bed Combustion Proceedings (pp. 463-470). Napoli, Italia.
Saastamoinen, Heidi ; Leino, Timo ; Tourunen, Antti. / Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed. 21st International Conference on Fluidized Bed Combustion Proceedings. Napoli, Italia, 2012. pp. 463-470
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title = "Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed",
abstract = "Oxyfuel combustion with CO2 capture is a considerable option for reduction of greenhouse gas emissions. Circulating fluidized bed (CFB) technology appears to be well suited to oxyfuel combustion. In order to study the differences in combustion phenomena and emission formation in air and oxyfuel combustion, the fuel pyrolysis and char combustion tests were performed with VTT’s bench scale bubbling fluidized bed reactor. In total seven fuels (Spanish anthracite, petroleum coke, Polish bituminous coal, Spanish lignite, South-African bituminous coal, wood chips, and straw pellet) were selected for these experiments. Three fuel batches were fed one at the time into reactor and pyrolyzed in sand bed. This was done for each fuel both in N2 and CO2 atmosphere. After the complete pyrolysis, gas was switched to 10{\%} of O2 and the remaining char was combusted. The gas evolution was measured with FTIR and on-line analysers. Char converted mostly to CO2 in N2 environment. In the CO2 environment a high amount of CO formed compared to N2 environment. The total SO2 conversion increased in oxyfuel conditions compared to air combustion conditions. The effect of combustion gas on nitrogen emission formation appeared to be highly dependent on the fuel volatile and nitrogen content. More N2O and less NO were detected during the pyrolysis in CO2 atmosphere compared to N2 atmosphere. From the experimental data, conversion of different species during the pyrolysis and char combustion can be obtained. The conversion parameters can be used in furnace sub-models to design optimal boiler configuration. The overall results can be applied in the development of the flexible air/oxy CFB concept.",
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Saastamoinen, H, Leino, T & Tourunen, A 2012, Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed. in 21st International Conference on Fluidized Bed Combustion Proceedings. Napoli, Italia, pp. 463-470, 21st International Conference on Fluidized Bed Combustion, 21FBC, Napoli, Italy, 3/06/12.

Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed. / Saastamoinen, Heidi; Leino, Timo; Tourunen, Antti.

21st International Conference on Fluidized Bed Combustion Proceedings. Napoli, Italia, 2012. p. 463-470.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed

AU - Saastamoinen, Heidi

AU - Leino, Timo

AU - Tourunen, Antti

N1 - Project code: 32762

PY - 2012

Y1 - 2012

N2 - Oxyfuel combustion with CO2 capture is a considerable option for reduction of greenhouse gas emissions. Circulating fluidized bed (CFB) technology appears to be well suited to oxyfuel combustion. In order to study the differences in combustion phenomena and emission formation in air and oxyfuel combustion, the fuel pyrolysis and char combustion tests were performed with VTT’s bench scale bubbling fluidized bed reactor. In total seven fuels (Spanish anthracite, petroleum coke, Polish bituminous coal, Spanish lignite, South-African bituminous coal, wood chips, and straw pellet) were selected for these experiments. Three fuel batches were fed one at the time into reactor and pyrolyzed in sand bed. This was done for each fuel both in N2 and CO2 atmosphere. After the complete pyrolysis, gas was switched to 10% of O2 and the remaining char was combusted. The gas evolution was measured with FTIR and on-line analysers. Char converted mostly to CO2 in N2 environment. In the CO2 environment a high amount of CO formed compared to N2 environment. The total SO2 conversion increased in oxyfuel conditions compared to air combustion conditions. The effect of combustion gas on nitrogen emission formation appeared to be highly dependent on the fuel volatile and nitrogen content. More N2O and less NO were detected during the pyrolysis in CO2 atmosphere compared to N2 atmosphere. From the experimental data, conversion of different species during the pyrolysis and char combustion can be obtained. The conversion parameters can be used in furnace sub-models to design optimal boiler configuration. The overall results can be applied in the development of the flexible air/oxy CFB concept.

AB - Oxyfuel combustion with CO2 capture is a considerable option for reduction of greenhouse gas emissions. Circulating fluidized bed (CFB) technology appears to be well suited to oxyfuel combustion. In order to study the differences in combustion phenomena and emission formation in air and oxyfuel combustion, the fuel pyrolysis and char combustion tests were performed with VTT’s bench scale bubbling fluidized bed reactor. In total seven fuels (Spanish anthracite, petroleum coke, Polish bituminous coal, Spanish lignite, South-African bituminous coal, wood chips, and straw pellet) were selected for these experiments. Three fuel batches were fed one at the time into reactor and pyrolyzed in sand bed. This was done for each fuel both in N2 and CO2 atmosphere. After the complete pyrolysis, gas was switched to 10% of O2 and the remaining char was combusted. The gas evolution was measured with FTIR and on-line analysers. Char converted mostly to CO2 in N2 environment. In the CO2 environment a high amount of CO formed compared to N2 environment. The total SO2 conversion increased in oxyfuel conditions compared to air combustion conditions. The effect of combustion gas on nitrogen emission formation appeared to be highly dependent on the fuel volatile and nitrogen content. More N2O and less NO were detected during the pyrolysis in CO2 atmosphere compared to N2 atmosphere. From the experimental data, conversion of different species during the pyrolysis and char combustion can be obtained. The conversion parameters can be used in furnace sub-models to design optimal boiler configuration. The overall results can be applied in the development of the flexible air/oxy CFB concept.

M3 - Conference article in proceedings

SN - 978-88-89677-83-4

SP - 463

EP - 470

BT - 21st International Conference on Fluidized Bed Combustion Proceedings

CY - Napoli, Italia

ER -

Saastamoinen H, Leino T, Tourunen A. Comparison of emission formation during pyrolysis and char combustion in air and oxyfuel conditions in fluidized bed. In 21st International Conference on Fluidized Bed Combustion Proceedings. Napoli, Italia. 2012. p. 463-470