A Broadband ASE Light Source-based FTTX RoF-WDM Optical Network System

S. Meng, S. B. Hu, H. Chu, C. Chang, Shu-Chuan Chu

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    8 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)162-170
    Number of pages9
    JournalJournal of Network Intelligence
    Volume206
    DOIs
    Publication statusPublished - 2017

    Keywords

    • N O
    • NO
    • O /H O
    • O /N
    • Single biomass particle

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