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CHEMKIN Simulation of NOx Emission of Deep Air-Staged Combustion(PDF)

《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

Issue:
2020 01
Page:
42-50
Research Field:
Publishing date:

Info

Title:
CHEMKIN Simulation of NOx Emission of Deep Air-Staged Combustion
Author(s):
Wang ChaoweiWang Chang’anWang PengqianWu SongChe Defu
State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China
Keywords:
deep air-stagedcombustion of methaneCHEMKINNOx
PACS:
TK11
DOI:
10.11715/rskxjs.R201903031
Abstract:
A model is established with two-stage PFR in CHEMKIN to study the fuel-N conversion in deep airstaged combustion including all the factors,and the results are analyzed by production rate and sensitivity analysis. The results show that the stoichiometric ratio of main combustion zone affects NOx emission significantly, especially under high temperature and strong reducing atmosphere.The temperature of main combustion zone should be considered to decrease NOx formation rather than that of burnout zone.The NOx emission is the lowest when the temperature of main combustion zone is lower than 1 500 and the ra ℃ te of overfire air is 35%.The staged O2/CO2 combustion under a fuel-rich condition increases OH/H ratio,leading to more NOx production.The NOx conversion rate will be reduced when the position of overfire air moves backward,but it will be hardly changed when the oxygen concentration of overfire air is changed.The paper not only expands the range of previous research,but also obtains the results that have not been reparted,which are analyzed by chemical reaction kinetics and helpful in reducing NOx emissions when the boiler is in practical operation.

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Last Update: 2020-01-17