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在沉降炉上通过在线烟气分析仪研究了燃烧气氛、CO2浓度、温度及燃料/氧气化学当量比对O2/CO2气氛下燃煤NO排放的影响规律。结果表明,O2/CO2气氛下NO的排放浓度总小于O2/N2气氛下的情况,在无烟气再循环的情况下降幅约为20%～40%。2种气氛下NO的沿程析出均表现出类似的规律,但因煤质而有所不同。随着进气中CO2浓度的增加,NO的排放浓度呈现降低的趋势。与21%O2/79%Ar气氛下相比,21%O2/79%CO2气氛下NO排放浓度的降幅在30%～50%。随着温度的增加,2种气氛下NO的排放浓度均增加。随着燃料/氧气化学当量比(φ)的增加,NO排放浓度呈现出先增加后降低的趋势,其最大排放浓度均出现在φ=0.8左右;在φ远大于1的富燃料区,2种气氛下NO的排放浓度基本可以降到一致的水平。
The effect of combustion atmosphere, CO2 concentration, temperature and fuel / oxygen stoichiometry on NO emission from coal combustion in O2 / CO2 atmosphere was studied by on-line flue gas analyzer on a settling furnace. The results show that the concentration of NO in the O2 / CO2 atmosphere is always lower than that in the O2 / N2 atmosphere, and decreases about 20-40% in the absence of recirculation of flue gas. Under the two kinds of atmosphere NO along the precipitation showed similar laws, but different due to coal quality. With the increase of CO2 concentration in intake air, NO emission concentration tends to decrease. Compared with 21% O2 / 79% Ar atmosphere, the concentration of NO in 21% O2 / 79% CO2 atmosphere decreases by 30% -50%. With the increase of temperature, the concentration of NO emission increased under the two kinds of atmosphere. With the increase of the fuel / oxygen stoichiometric ratio (φ), the NO emission concentration first increases and then decreases, and the maximum emission concentration appears at φ = 0.8. In the rich fuel zone with φ greater than 1, two kinds of atmosphere Under the NO emission concentration can be basically reduced to a consistent level.