Combustion Characteristics of Single Particles from Bituminous Coal and Pine Sawdust in O 2 /N 2, O 2 /CO 2, and O 2 /H 2 O Atmospheres

Kai Lei, Buqing Ye, Jin Cao, Rui Zhang and Dong Liu
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Kai Lei: Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Buqing Ye: Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Jin Cao: Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Rui Zhang: Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Dong Liu: Ministry of Industry and Information Technology Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China

Energies, 2017, vol. 10, issue 11, 1-12

Abstract: Burning fuels in an O 2 /H 2 O atmosphere is regarded as the next generation of oxy-fuel combustion for CO 2 capture and storage (CCS). By combining oxy-fuel combustion and biomass utilization technology, CO 2 emissions could be further reduced. Therefore, this work focuses on investigating the combustion characteristics of single particles from bituminous coal (BC) and pine sawdust (PS) in O 2 /N 2 , O 2 /CO 2 and O 2 /H 2 O atmospheres at different O 2 mole fractions (21%, 30%, and 40%). The experiments were carried out in a drop tube furnace (DTF), and a high-speed camera was used to record the combustion processes of fuel particles. The combustion temperatures were measured by a two-color method. The results reveal that the particles from BC and PS all ignite homogeneously. Replacing N 2 by CO 2 results in a longer ignition delay time and lower combustion temperatures. After substituting H 2 O for N 2 , the ignition delay time is shortened, which is mainly caused by the steam gasification reaction (C + H 2 O ? CO + H 2 ) and steam shift reaction (CO + H 2 O ? CO 2 + H 2 ). In addition, the combustion temperatures are first decreased at low O 2 mole fractions, and then increased at high O 2 mole fractions because the oxidation effect of H 2 O performs a more important role than its volumetric heat capacity and thermal radiation capacity. At the same condition, particles from PS ignite earlier because of their higher reactivity, but the combustion temperatures are lower than those of BC, which is owing to their lower calorific values.

Keywords: oxy-fuel combustion; O 2 /H 2 O; single particle; bituminous coal (BC); pine sawdust (PS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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