TY - JOUR
T1 - A Broadband ASE Light Source-based FTTX RoF-WDM Optical Network System
AU - Meng, S.
AU - Hu, S. B.
AU - Chu, H.
AU - Chang, C.
AU - Chu, Shu-Chuan
PY - 2017
Y1 - 2017
N2 - Oxy-H
2O combustion is a novel oxy-fuel combustion technology, different from conventional and oxy-CO
2 combustion. NO and N
2O emissions during devolatilization and char combustion of a single biomass particle in O
2/N
2 and O
2/H
2O were investigated in a tube reactor under different temperatures (700 °C, 800 °C, and 900 °C) and oxygen concentrations (21%, 30%, 40%, and 50% by volume). Single biomass pellets of poplar wood, rice husk, and corn stalk were selected. The method of isothermal thermo-gravimetric analysis was applied to distinguish the two stages of biomass combustion based on its proximate analysis. The presence of H
2O vapor can improve the free radicals, H
2 and CO concentrations, promoting NO and N
2O reduction. The total conversions of fuel-N to NO and N
2O in O
2/N
2 are over 2 times higher than those in O
2/H
2O. In O
2/N
2, NO is formed as the sample heated up, while N
2O is mainly formed during char combustion stage. However, NO is formed after N
2O in O
2/H
2O. No matter in O
2/N
2 or in O
2/H
2O, a higher fuel-N content in biomass results in higher NO and N
2O yields during the two stages, whilst the conversions of fuel-N to NO and N
2O during the two stages decrease with increasing fuel-N/ash content. In O
2/N
2, the total conversion of fuel-N to NO reaches the maximum value (14.35%) at T = 800 °C, whilst the total conversion of fuel-N to NO increases with increasing temperature in O
2/H
2O. The total conversions of fuel-N to N
2O decrease with increasing temperature in O
2/N
2 and O
2/H
2O. The influence of oxygen concentration on NO and N
2O is similar to that of temperature. In O
2/N
2, there is a maximum value of the total conversion of fuel-N to NO (14.35%) at 〈O
2〉 = 30%, whilst there is no obvious change of the total conversion of fuel-N to NO with increasing oxygen concentration in O
2/H
2O. The total conversions of fuel-N to N
2O decrease with increasing oxygen concentration in O
2/N
2 and O
2/H
2O. The results are beneficial to understand the NO and N
2O emission mechanisms and favorable for the NO and N
2O control in O
2/H
2O.
AB - Oxy-H
2O combustion is a novel oxy-fuel combustion technology, different from conventional and oxy-CO
2 combustion. NO and N
2O emissions during devolatilization and char combustion of a single biomass particle in O
2/N
2 and O
2/H
2O were investigated in a tube reactor under different temperatures (700 °C, 800 °C, and 900 °C) and oxygen concentrations (21%, 30%, 40%, and 50% by volume). Single biomass pellets of poplar wood, rice husk, and corn stalk were selected. The method of isothermal thermo-gravimetric analysis was applied to distinguish the two stages of biomass combustion based on its proximate analysis. The presence of H
2O vapor can improve the free radicals, H
2 and CO concentrations, promoting NO and N
2O reduction. The total conversions of fuel-N to NO and N
2O in O
2/N
2 are over 2 times higher than those in O
2/H
2O. In O
2/N
2, NO is formed as the sample heated up, while N
2O is mainly formed during char combustion stage. However, NO is formed after N
2O in O
2/H
2O. No matter in O
2/N
2 or in O
2/H
2O, a higher fuel-N content in biomass results in higher NO and N
2O yields during the two stages, whilst the conversions of fuel-N to NO and N
2O during the two stages decrease with increasing fuel-N/ash content. In O
2/N
2, the total conversion of fuel-N to NO reaches the maximum value (14.35%) at T = 800 °C, whilst the total conversion of fuel-N to NO increases with increasing temperature in O
2/H
2O. The total conversions of fuel-N to N
2O decrease with increasing temperature in O
2/N
2 and O
2/H
2O. The influence of oxygen concentration on NO and N
2O is similar to that of temperature. In O
2/N
2, there is a maximum value of the total conversion of fuel-N to NO (14.35%) at 〈O
2〉 = 30%, whilst there is no obvious change of the total conversion of fuel-N to NO with increasing oxygen concentration in O
2/H
2O. The total conversions of fuel-N to N
2O decrease with increasing oxygen concentration in O
2/N
2 and O
2/H
2O. The results are beneficial to understand the NO and N
2O emission mechanisms and favorable for the NO and N
2O control in O
2/H
2O.
KW - N O
KW - NO
KW - O /H O
KW - O /N
KW - Single biomass particle
UR - http://bit.kuas.edu.tw/~jni/2017/vol2/JNI_2017_vol2_n1_003.pdf
UR - http://www.scopus.com/inward/record.url?scp=85020276459&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2017.05.089
DO - 10.1016/j.fuel.2017.05.089
M3 - Article
VL - 206
SP - 162
EP - 170
JO - Journal of Network Intelligence
JF - Journal of Network Intelligence
SN - 2414-8105
ER -