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Combustion interactions in oxy-fuel firing of coal blends: An experimental and numerical study
- Source :
- Ma, L, Yu, S, Chen, X, Fang, Q, Yin, C, Zhang, C & Chen, G 2021, ' Combustion interactions in oxy-fuel firing of coal blends: An experimental and numerical study ', Journal of the Energy Institute, vol. 94, pp. 11-21 . https://doi.org/10.1016/j.joei.2020.10.007
- Publication Year :
- 2021
-
Abstract
- Coal blends are commonly used in thermal power plants and oxy-fuel combustion also attracts great concerns recently. However, little has been done on oxy-fuel combustion of coal blends. In this paper, combustion tests are performed in a drop tube furnace for various coal blends under O2/CO2 mixtures, which are also reproduced numerically. Strong combustion interactions between the parent coals in a blend are observed. The ignition of the low-volatile coal is promoted due to the rapid combustion of the volatiles from the high-volatile coal. However, the char burnout of the low-volatile coal is compromised due to the rapid O2 consumption by the large amount of volatiles. The interactions under oxy-fuel conditions are more sensitive to the excess O2, inlet oxidizer temperature and coal particle size. 1) The increase in the excess O2 tends to weaken the combustion interactions, in which both the ignition promotion and burnout inhibition effects on the low-volatile coal become less apparent. 2) The increase in the inlet oxidizer temperature further promotes the ignition of the low-volatile coal whereas weakens the burnout inhibition of the low-volatile coal. 3) The effects of reducing particle size on the combustion interactions are similar to those of increasing inlet oxidizer temperature. Since biomass often contains a high volatile content, the findings may shed light on the synergistic effects in oxy-fuel co-combustion of biomass and coal.
- Subjects :
- Combustion interactions
Materials science
020209 energy
Biomass
Thermal power station
02 engineering and technology
Combustion
complex mixtures
law.invention
020401 chemical engineering
law
0202 electrical engineering, electronic engineering, information engineering
otorhinolaryngologic diseases
SDG 13 - Climate Action
Burnout
Coal
Tube furnace
Char
0204 chemical engineering
Coal blends
Oxy-fuel
business.industry
technology, industry, and agriculture
respiratory system
Ignition
respiratory tract diseases
Ignition system
Chemical engineering
Particle size
business
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Ma, L, Yu, S, Chen, X, Fang, Q, Yin, C, Zhang, C & Chen, G 2021, ' Combustion interactions in oxy-fuel firing of coal blends: An experimental and numerical study ', Journal of the Energy Institute, vol. 94, pp. 11-21 . https://doi.org/10.1016/j.joei.2020.10.007
- Accession number :
- edsair.doi.dedup.....b91da9824db712fed048e27021a547cc