共查询到18条相似文献,搜索用时 187 毫秒
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无焰燃烧是一种同时具备高效和低排放特点的燃烧技术,然而传统实现无焰燃烧所需的高温预热空气及高速射流两大重要条件,提高了整体工业设备实现无焰燃烧的复杂性,限制了该技术在更广阔领域的发展。本文综述了无焰燃烧燃烧机理与特性的研究发展,并提出了未来可能的发展趋势。分析发现:高温预热空气并不是实现无焰燃烧的必要条件,而通过高速射流提高炉内烟气循环率却必不可少;使用EDC模型结合GRI 3.0反应机理能在数值模拟中得到贴合实验数据的结果;气体、液体及固末燃料均可实现无焰燃烧,使用CH4/H2混合气体实现无焰燃烧可在提升燃烧稳定性的同时依旧保持低排放的特点;炉膛结构可很大程度上影响炉内流场进而影响无焰燃烧效果。因此,研究无需预热的无焰燃烧系统在降低工业成本的同时可增大燃料种类的选择性,通过设计合理的炉膛结构,营造良好的炉内流场在强化无焰燃烧效果的同时可一定程度降低对初始射流速度的要求,研究CH4/H2混合气体的燃烧机理具有十分重要的意义。 相似文献
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研究了常温空气无焰燃烧中CO的生成规律。常温空气无焰燃烧在整个炉膛内同时发生弥散燃烧反应,炉膛内燃烧气混合均匀,燃烧反应稳定。因而CO的生成量低。实验研究和计算分析表明:CO主要生成在离燃烧器喷口约600—3000mm、6400mm的柱状空间内,在柱状空间外的其它区域,燃烧充分,CO几乎为零。过量空气系数与容积热负荷时烟气中CO生成量的影响不大。与传统的有焰燃烧和近代的高温空气无焰燃烧相比,常温空气无焰燃烧中CO生成低,且排放稳定。 相似文献
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朱瑾娟 《福建能源开发与节约》2012,(1):31-33
通过对现今高温空气燃烧方面文献的总结,得到了高温空气燃烧技术及高温空气燃烧系统的特点、发展和国内外应用研究现状。并对高温空气燃烧的发展提出了自己的一点看法,期望高温空气燃烧能够实现大型化,结构简单化,以拓宽其应用领域。 相似文献
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ho~cuon,Recently, much attenhon has been paid to uhliZinghidly Preheated air up to l,(XX)"C through waste gas inindustrial furnaces, in which about 15% of totalnational energy in KOrea were consumed, because ofhigh efficiency of energy savings. Moreover, one ofthree major issues in the fiscal 1996," UnderstandingEnhancement of ugh TemP~ Air COmbushon" hasbeen stUdied as successive subject in the Japanesenational Project tO reduce CO, for Protechon of earth.IntrDduction of high regenera… 相似文献
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《International Journal of Hydrogen Energy》2022,47(49):21287-21297
Considering the trend toward decarbonization, hydrogen is expected to be used as a fuel in industrial furnace burners. One of the challenges in using hydrogen as a fuel is the increase in thermal-NOx emission compared to hydrocarbon fuel owing to its high flame temperature. This study experimentally evaluated the combustion characteristics of flameless combustion, which is a low-NOx combustion technology, with hydrogen as a fuel in a practical-scale experimental furnace as well as the effect of nozzle design parameters on the combustion characteristics. Through comparative tests with city gas by considering parameters, such as the fuel gas velocity, combustion air velocity, and air nozzle pitch, the low-NOx effect of flameless combustion was confirmed in hydrogen combustion with appropriate nozzle design parameters. The optimal nozzle design parameters to achieve this effect differ from those for city gas, and the design guidelines are summarized. 相似文献
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以工业炉的高温空气燃烧技术应用为背景,对一个新型轴向旋流式单烧嘴燃烧室内天然气的高温空气燃烧特性进行了数值研究。采用数值模拟的方法研究了同心式轴向旋流燃烧器(HCASbumer)中螺旋肋片的旋转角度对燃烧特性的影响,其中湍流采用Reynolds应力模型,气相燃烧模拟采用β函数形式的PDF燃烧模型,采用离散坐标法模拟辐射换热过程,NOx模型为热力型与快速型。计算结果表明,对预热空气采用旋转射流时,能明显降低NOx生成量。对于HCAS型燃烧器,随着空气射流旋转角度的增大,燃烧室内的回流区域增大增强,降低了局部的氧体积分数分布,燃烧室中平均温度和最高温度都有所增加,且燃烬程度大幅度提高,而局部高温区缩小,只在靠近入口处出现。总的NOx排放量随着空气射流旋转角度的增大先减小,后增大。因此,适当调整肋片的旋转角度可以降低NOx生成量。 相似文献
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Nitrogen oxide formation is one source of pollution emission in fossil fuel combustion. Numerous technologies, such as flameless combustion, have been introduced to prevent such formation. This paper presents a panorama of flameless combustion and its principles. The influence of this technology on air preheats and gas diluents is discussed, as well as the effect of the firing mode on thermal NOX. The benefits of flameless combustion, including its energy conservation capability and capability to reduce pollutant emissions such as NOX emission to overcome environmental dilemmas in combustion, are discussed in this paper. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献