TY - JOUR
T1 - Sensitivity analysis of different devolatilisation models on predicting ignition point position during pulverized coal combustion in O 2/N 2 and O 2/CO 2 atmospheres
AU - Jovanovic, Rastko
AU - Milewska, Aleksandra
AU - Swiatkowski, Bartosz
AU - Goanta, Adrian
AU - Spliethoff, Hartmut
N1 - Funding Information:
This work is funded by European Commission under the Sixth Framework Programme within the Marie Curie Actions project INECSE (Early Stage Research Training in Integrated Energy Conversion for a Sustainable Environment), EU-CONTRACT-NUMBER: MEST-CT-2005-021018, and by Serbian Ministry for Science and Technology, Project III42010: “Reduction of air pollution from thermal power plants in pe electric power industry of Serbia”.
PY - 2012/11
Y1 - 2012/11
N2 - Oxy-fuel combustion is considered as a promising solution to reduce greenhouse-gases and pollutant emissions. The main advantage of oxy-fuel combustion over other technologies for pollution reduction from pulverized coal combustion is that it can be applied to the existing coal-fired power plants. However, switching from conventional to oxy-fired coal combustion brings significant challenges. One of the most important is change of pulverized coal ignition characteristics. This paper presents the results of experimental and numerical analysis of ignition phenomena under oxy-fuel conditions. The main focus of the presented paper is to evaluate the effectiveness of the mathematical devolatilisation sub-model, in predicting the ignition point of pulverized coal flames under oxy-firing conditions. Regarding this, the performance of several devolatilisation models, from simple to more complex ones, in predicting ignition point position have been investigated. Numerically determined values of the ignition point position, and ignition temperature for various O 2-N 2 and O 2-CO 2 conditions were compared with experimental data from the laboratory ignition test facility. Obtained results pointed out that network devolatilisation models (CPD and FG) give more accurate results in comparison with standard devolatilisation models (single rate and two competing rates). The best performance is achieved using FG devolatilisation model. Thus, newly implemented FG model will be used for future numerical simulations of oxy-fuel pulverized coal combustion on 0.5 MW pilot plant facility.
AB - Oxy-fuel combustion is considered as a promising solution to reduce greenhouse-gases and pollutant emissions. The main advantage of oxy-fuel combustion over other technologies for pollution reduction from pulverized coal combustion is that it can be applied to the existing coal-fired power plants. However, switching from conventional to oxy-fired coal combustion brings significant challenges. One of the most important is change of pulverized coal ignition characteristics. This paper presents the results of experimental and numerical analysis of ignition phenomena under oxy-fuel conditions. The main focus of the presented paper is to evaluate the effectiveness of the mathematical devolatilisation sub-model, in predicting the ignition point of pulverized coal flames under oxy-firing conditions. Regarding this, the performance of several devolatilisation models, from simple to more complex ones, in predicting ignition point position have been investigated. Numerically determined values of the ignition point position, and ignition temperature for various O 2-N 2 and O 2-CO 2 conditions were compared with experimental data from the laboratory ignition test facility. Obtained results pointed out that network devolatilisation models (CPD and FG) give more accurate results in comparison with standard devolatilisation models (single rate and two competing rates). The best performance is achieved using FG devolatilisation model. Thus, newly implemented FG model will be used for future numerical simulations of oxy-fuel pulverized coal combustion on 0.5 MW pilot plant facility.
KW - CFD modelling
KW - Devolatilisation
KW - Oxy-combustion
KW - Oxy-fuel
KW - Pulverized coal
UR - http://www.scopus.com/inward/record.url?scp=84865519809&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2011.02.024
DO - 10.1016/j.fuel.2011.02.024
M3 - Article
AN - SCOPUS:84865519809
SN - 0016-2361
VL - 101
SP - 23
EP - 37
JO - Fuel
JF - Fuel
ER -