THE EFFECTIVENESS OF REBURNING USING RICE HUSK AS SECONDARY FUEL FOR NO X REDUCTION IN A FURNACE
THE EFFECTIVENESS OF REBURNING USING RICE HUSK AS SECONDARY FUEL FOR NO X REDUCTION IN A FURNACE
复制标题
使用稻壳作为二次燃料再燃烧炉内氮氧化物减排的效果
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Mário Costa
中科院分区：
文献类型：
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作者：
C. Casaca;Mário Costa
摘要本研究的目的是评估在大型实验室炉中使用生物质（稻壳）作为再燃烧燃料的再燃烧过程的有效性。为了进行比较，还使用天然气和乙烯作为再燃燃料进行了试验。本文报告了广泛实验条件下烟气排放的新数据，这些数据量化了再燃燃料分数（能量基础）、在再燃区域停留时间和三种二次燃料的初始nox浓度对当前燃烧室nox减少的影响。结果表明,在再燃区居住时间约为0.7秒的再燃烧性能稻壳(1)与高再燃燃料天然气再燃烧的分数,在再燃燃料减少近60%没有x实现25 - 30%的分数,和(2)方法的天然气和乙烯在高初始浓度没有x,近60%没有在最初没有减少实现x浓度约500至970 ppm。结果还表明，nox的还原程度与颗粒的燃尽程度存在相关性：还原程度越高，燃尽程度越低。然而，本研究结果与先前使用煤作为再燃燃料的同一炉的数据相结合，表明在全尺寸设备中使用稻壳作为再燃燃料对碳燃尽的影响比使用煤要小。
ABSTRACT The aim of the present work was to evaluate the effectiveness of the reburning process using biomass (rice husk) as reburn fuel in a large-scale laboratory furnace. For comparison purposes, tests were also conducted using natural gas and ethylene as reburn fuels. The paper reports new data for flue-gas emissions for a wide range of experimental conditions which quantify the effects of the reburn fuel fraction (energy basis), residence time in the reburning zone, and initial NO x concentration for the three secondary fuels on NO x reduction from the present combustor. The results show that at reburn zone residence times of about 0.7 s the reburning performance of the rice husk (1) is comparable to that of the natural gas reburning at high reburn fuel fractions, with almost 60% NO x reduction achievable at reburn fuel fractions of 25 and 30%, and (2) approaches those of the natural gas and ethylene at high initial NO x concentrations, with nearly 60% NO x reduction attainable at initial NO x concentrations between around 500 and 970 ppm. The results also reveal that there is a correlation between the extent of NO x reduction and particle burnout: the higher the reduction, the lower the burnout. However, the present results combined with previous data from the same furnace using coal as reburn fuel suggest that the use of rice husk as reburn fuel in full-scale equipment would have a lower impact in the carbon burnout as compared with coal.