CFD simulation of biofuel and coal co-combustion in a pulverized coal fired furnace

Perttu Jukola, Marko Huttunen

Research output: Contribution to conferenceConference articleScientific

Abstract

Torrefied (thermally treated) biomass and pyrolysis oil are examples of processed, energy dense biofuels that might be utilized in energy production instead of fossil sources. Computational fluid dynamics code Fluent equipped with relevant user-defined sub-models was applied to simulate co-combustion of these supplementary fuels and coal in a full scale pulverized coal fired furnace with a capacity of 275 MWfuel. Biofuel shares up to 40 % by energy were considered. Changes in combustion process (heat transfer, burnout, NOx emissions) compared to normal coal operation were investigated and their influence in boiler performance analysed. According to the result there are in general no drastic changes in the furnace process, hence utilization of the supplementary biofuels considered seems feasible from the combustion point of view. Evaporator heat transfer is predicted to decrease slightly especially in pyrolysis oil co-firing. Solid combustion efficiency remains at acceptable level in all cases. Share of unburned carbon fly ash is estimated to increase in torrefied biomass co-firing as a consequence of degrading particle fineness assuming integrated milling of biomass and coal. However total ash flow is remarkably lower. NOx emission reduction up to 20 % can be expected in co-firing cases with investigated biofuel shares.
Original languageEnglish
Publication statusPublished - 2013
MoE publication typeNot Eligible
EventFinnish-Swedish Flame Days 2013 - Jyväskylä, Finland
Duration: 17 Apr 201318 Apr 2013

Conference

ConferenceFinnish-Swedish Flame Days 2013
CountryFinland
CityJyväskylä
Period17/04/1318/04/13

Fingerprint

Biofuels
Computational fluid dynamics
Furnaces
Coal
Biomass
Pyrolysis
Heat transfer
Evaporators
Fly ash
Coal ash
Boilers
Carbon
Oils

Keywords

  • CFD
  • combustion
  • biofuels
  • torrefaction
  • pyrolysis oil
  • pulverized coal

Cite this

Jukola, P., & Huttunen, M. (2013). CFD simulation of biofuel and coal co-combustion in a pulverized coal fired furnace. Paper presented at Finnish-Swedish Flame Days 2013, Jyväskylä, Finland.
Jukola, Perttu ; Huttunen, Marko. / CFD simulation of biofuel and coal co-combustion in a pulverized coal fired furnace. Paper presented at Finnish-Swedish Flame Days 2013, Jyväskylä, Finland.
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Jukola, P & Huttunen, M 2013, 'CFD simulation of biofuel and coal co-combustion in a pulverized coal fired furnace' Paper presented at Finnish-Swedish Flame Days 2013, Jyväskylä, Finland, 17/04/13 - 18/04/13, .

CFD simulation of biofuel and coal co-combustion in a pulverized coal fired furnace. / Jukola, Perttu; Huttunen, Marko.

2013. Paper presented at Finnish-Swedish Flame Days 2013, Jyväskylä, Finland.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - CFD simulation of biofuel and coal co-combustion in a pulverized coal fired furnace

AU - Jukola, Perttu

AU - Huttunen, Marko

PY - 2013

Y1 - 2013

N2 - Torrefied (thermally treated) biomass and pyrolysis oil are examples of processed, energy dense biofuels that might be utilized in energy production instead of fossil sources. Computational fluid dynamics code Fluent equipped with relevant user-defined sub-models was applied to simulate co-combustion of these supplementary fuels and coal in a full scale pulverized coal fired furnace with a capacity of 275 MWfuel. Biofuel shares up to 40 % by energy were considered. Changes in combustion process (heat transfer, burnout, NOx emissions) compared to normal coal operation were investigated and their influence in boiler performance analysed. According to the result there are in general no drastic changes in the furnace process, hence utilization of the supplementary biofuels considered seems feasible from the combustion point of view. Evaporator heat transfer is predicted to decrease slightly especially in pyrolysis oil co-firing. Solid combustion efficiency remains at acceptable level in all cases. Share of unburned carbon fly ash is estimated to increase in torrefied biomass co-firing as a consequence of degrading particle fineness assuming integrated milling of biomass and coal. However total ash flow is remarkably lower. NOx emission reduction up to 20 % can be expected in co-firing cases with investigated biofuel shares.

AB - Torrefied (thermally treated) biomass and pyrolysis oil are examples of processed, energy dense biofuels that might be utilized in energy production instead of fossil sources. Computational fluid dynamics code Fluent equipped with relevant user-defined sub-models was applied to simulate co-combustion of these supplementary fuels and coal in a full scale pulverized coal fired furnace with a capacity of 275 MWfuel. Biofuel shares up to 40 % by energy were considered. Changes in combustion process (heat transfer, burnout, NOx emissions) compared to normal coal operation were investigated and their influence in boiler performance analysed. According to the result there are in general no drastic changes in the furnace process, hence utilization of the supplementary biofuels considered seems feasible from the combustion point of view. Evaporator heat transfer is predicted to decrease slightly especially in pyrolysis oil co-firing. Solid combustion efficiency remains at acceptable level in all cases. Share of unburned carbon fly ash is estimated to increase in torrefied biomass co-firing as a consequence of degrading particle fineness assuming integrated milling of biomass and coal. However total ash flow is remarkably lower. NOx emission reduction up to 20 % can be expected in co-firing cases with investigated biofuel shares.

KW - CFD

KW - combustion

KW - biofuels

KW - torrefaction

KW - pyrolysis oil

KW - pulverized coal

M3 - Conference article

ER -

Jukola P, Huttunen M. CFD simulation of biofuel and coal co-combustion in a pulverized coal fired furnace. 2013. Paper presented at Finnish-Swedish Flame Days 2013, Jyväskylä, Finland.