Emissions of NO and CO from counterflow combustion of CH4 under MILD and oxyfuel conditions
Emissions of NO and CO from counterflow combustion of CH4 under MILD and oxyfuel conditions
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MILD 和富氧燃料条件下 CH4 逆流燃烧的 NO 和 CO 排放
DOI:
10.1016/j.energy.2017.02.083
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发表时间:
2017-04
期刊:
影响因子:
9
通讯作者:
Mi Jianchun
中科院分区:
文献类型:
--
作者:
Cheong Kin-Pang;Li Pengfei;Wang Feifei;Mi Jianchun
This paper reports on the NO and CO emission characteristics of counterflow combustion of methane simulated under MILD or/and oxyfuel conditions. Simulations using CHEMKIN are conducted for various injection conditions of fuel and oxidizer. Note that the terms “oxyfuel”, “MILD-N2” and “MILD-CO2” combustion adopted hereafter represent the conventional oxy-combustion and those MILD combustions diluted by N2and CO2, respectively. It is observed that the NO emission of MILD-CO2combustion is ultra-low for all cases of investigation, even when increasing the combustion temperature up to 2000 K or adding more N2(up to 20%) to either the fuel stream (to simulate nitrogen-containing fuels like biomass) or the oxidizer stream (to simulate the air-ingress). A higher temperature allowed under MILD-CO2combustion suggests the improvement of energy efficiency for the MILD combustion technology. Moreover, the presence of steam in the oxidant reduces both NO and CO emissions of combustion for all cases.The relative importance analysis reveals that the N2O-intermediate mechanism for producing NO prevails in MILD-CO2combustion while the prompt and thermal mechanisms predominate MILD-N2and oxyfuel combustion, respectively. In addition, the sensitivity analysis identifies those main reactions that play important roles for the NO emission under these combustion conditions.
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DOI:
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发表时间:
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期刊:
--
影响因子:
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