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首页> 外文期刊>Thermal engineering >The Generation and Suppression of NO_x and N_2O Emissions in the Oxy-Fuel Combustion Process with Recycled CO_2 (an Overview)
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The Generation and Suppression of NO_x and N_2O Emissions in the Oxy-Fuel Combustion Process with Recycled CO_2 (an Overview)

机译：RECOCLED CO_2氧燃料燃烧过程中NO_X和N_2O排放的产生和抑制（概述）

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Abstract It is shown that combustion of solid fuels in an oxygen atmosphere with recycled flue gases is an efficient method for capture of CO2. The use of the circulating fluidized bed (CFB) technology in the oxy-fuel combustion process reduces the CO2 capture costs and nitrogen oxide emissions compared with flare combustion. The mechanisms of generation and suppression of nitrogen and nitrous oxides during CFB combustion of solid fuels are considered. The basic reactions that occur during the exit and burning of volatiles and combustion of char resulting in generation of NO, N2O, and N2 are indicated. The effect of the secondary air delivery on nitrogen oxide emissions is studied. It is shown that the degree of converting fuel nitrogen into N2O is reduced when the degree of converting nitrogen into NOx is increased. Comparative analysis that the effect of flue gas recycling and other process factors has on generation of NO and N2O during combustion in air, oxygen, and CO2 has been made. It is shown that, owing to recycling, the fractions of NOx and N2O generated from fuel nitrogen during oxy-fuel combustion are significantly lower than those during combustion in air. Mathematical simulation of various complicated processes related to generation and suppression of hazardous pollutant emissions has recently become a generally accepted method that allows the prediction at relatively low costs of such processes during the combustion of various fuels. However, as applied to new technologies for combustion of various biomass types and cofiring of coal and biomass, these methods have not yet been properly developed. The most preferable mathematical models for calculating nitrogen oxide emissions are provided, and the predicted results are compared with experimental data. The lines of further research, predominantly in the simulation of cofiring of coal and biomass, are outlined. It is shown that comprehensive investigations of generation and suppression of hazardous pollutant emissions during cofiring of coals and biomass of various kinds, in particular, during oxy-fuel combustion with recycled CO2 are of topical interest.
机译：摘要表明，具有再循环烟道气体的氧气气氛中固体燃料的燃烧是捕获CO2的有效方法。在氧燃料燃烧过程中使用循环流化床（CFB）技术降低了与燃烧燃烧相比的CO2捕获成本和氮氧化物排放。考虑了CFB固体燃料燃烧期间氮气和氮氧化物的产生和抑制的机理。表示在出口和燃烧挥发物期间发生的基本反应和产生NO，N 2 O和N 2的产生的燃烧。研究了二次空气输送对氮氧化物排放的影响。结果表明，当将氮气转化为NOx的程度增加时，将燃料氮的变化程度转化为N2O。比较分析：在空气，氧气和二氧化碳中燃烧过程中烟气回收和其他过程因子的影响和其他过程因子对NO和N2O产生的影响。结果表明，由于再循环，在氧燃料燃烧期间从燃料氮期间产生的NOx和N2O的级分显着低于空气中燃烧期间的燃料氮。危险污染物排放的产生和抑制相关的各种复杂过程的数学模拟最近成为允许在各种燃料燃烧过程中以相对低的成本预测的方法。然而，如适用于燃烧各种生物量类型和煤炭和生物量的燃烧的新技术，这些方法尚未适当地发展。提供用于计算氮氧化物排放的最优选的数学模型，并将预测结果与实验数据进行比较。概述了进一步研究的线条，主要是在模拟煤和生物质的核心的模拟中。结果表明，在与再循环二氧化碳的氧燃料燃烧期间，在煤气和生物质的煤和生物质中，对各种煤和生物质的危险污染物排放的综合调查是局部兴趣。

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