共查询到19条相似文献,搜索用时 109 毫秒
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几何结构影响高温空气燃烧特性的数值分析 总被引:1,自引:0,他引:1
通过改变燃料喷口周围空气喷口分布夹角,采用数值计算的方法研究了高温空气燃烧特性的变化,包括燃烧温度场、速度场和NOx的生成和出口排放情况。模拟结果说明,减小空气分布夹角可以降低燃烧区最高温度和平均温度,扩大燃烧室内低氧范围,有效抑制热力型NOx的生成和排放。所采用的计算模型和计算方法可以较好地模拟高温空气燃烧过程,计算结果可信。 相似文献
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高温空气燃烧技术通过回收烟气中的余热,实现高效节能.由于采用高温空气助燃,所以NOx的生成规律和常规燃烧不同.本文以5喷口带夹角烧嘴做为研究对象,通过数值模拟的方法对NOx生成进行了系统的研究,得出了助燃空气预热温度、助燃空气的含氧量、过量空气系数、空气射流的角度和钢坯吸热热流等5大因素对NOx生成的影响规律. 相似文献
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蓄热燃烧中NOx生成规律研究 总被引:1,自引:0,他引:1
蓄热燃烧技术通过回收烟气中的余热,实现高效节能.由于采用高温空气助燃,所以NOx的生成规律和常规燃烧不同.文章以五喷口带夹角烧嘴为研究对象,采用数值模拟的方法对NOx生成进行了系统地研究,得出了助燃空气预热温度、助燃空气的含氧量、过量空气系数、空气射流的角度和钢坯吸热热流等五大因素对NOx生成的影响规律. 相似文献
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Numerical Simulation of Combustion Characteristics in High Temperature Air Combustion Furnace 总被引:1,自引:0,他引:1
The influences of air preheating temperature, oxygen concentration, and fuel inlet temperature on flame properties, and NOx formation and emission in the furnace were studied with numerical simulation. The turbulence behavior was modeled using the standard k ε model with wall function, and radiation was handled using discrete ordinate radiation model. The PDF (probability density function)/mixture fraction combustion model was used to simulate the propane combustion. Additionally, computations of NOx formation rates and NOx concentration were carried out using a post processor on the basis of previously calculated velocities, turbulence, temperature, and chemical composition fields. The results showed that high temperature air combustion (HiTAC) is spread over a much larger volume than traditional combustion, flame volume increases with a reduction of oxygen concentration, and this trend is clearer if oxygen concentration in the preheated air is below 10%. The temperature profile becomes more uniform when oxygen concentration in preheated air decreases, especially at low oxygen levels. Increase in fuel inlet temperature lessens the mixing of the fuel and air in primary combustion zone, creates more uniform distribution of reactants inside the flame, decreases the maximum temperature in furnace, and reduces NOx emission greatly. 相似文献
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DBS吸附剂治理高浓度NOx的实践 总被引:1,自引:0,他引:1
介绍DBS吸附剂净化器治理高浓度NOx的原理和特点,通过对用硝酸溶解银粉制备电解液产生的NOx废气的治理实践表明,采用本工艺治理间断的、阵发性排放的高浓度NOx废气,净化率可以达到98%以上,净化后的废气NOx浓度低于排放标准,工艺设备简单,易操作,对高浓度NOx的治理具有很好的推广及应用价值。 相似文献
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《钢铁研究学报(英文版)》2017,(12)
As the emission control regulations get stricter,the NO_x reduction in the sintering process becomes an important environmental concern owing to its role in the formation of photochemical smog and acid rain.The NOxemissions from the sintering machine account for 48% of total amount from the iron and steel industry.Thus,it is essential to reduce NO_x emissions from the sintering machine,for the achievement of clean production of sinter.Ca-Fe oxides,serving as the main binding phase in the sinter,are therefore used as additives into the sintering mixture to reduce NOxemissions.The results show that the NO_x reduction ratio achieves 27.76% with 8% Ca-Fe oxides additives since the Ca-Fe oxides can advance the ignition and inhibit the nitrogen oxidation compared with the conventional condition.Meanwhile,the existence of Ca-Fe oxides was beneficial to the sinter quality since they were typical low melting point compounds.The optimal mass fraction of Ca-Fe oxides additives should be less than 8%since the permeability of sintering bed was significantly decreased with a further increase of the Ca-Fe oxides fines,inhibiting the mineralization reaction of sintering mixture.Additionally,the appropriate particle size can be obtained when mixing an equal amount of Ca-Fe oxides additives of-0.5 mm and 0.5-3.0 mm in size. 相似文献
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介绍了高温空气燃烧技术的基本原理及技术优势,分析了固体燃料高温空气气化机理,给出了固体燃料高温空气气化的实现方法,并通过实例论证了高温空气燃烧技术在固体燃料气化中的可行性与优越性。为高温空气燃烧技术在固体燃料气化中的推广与应用提供参考。 相似文献
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最近,燃气轮机废气再燃烧的合成循环系统作为增强现有火力发电输出功率和提高火力发电效率的有效手段特别引人注目.在本系统中,由于锅炉采用燃气轮机的废气进行燃烧,因此,如果废气中的氧浓度过低,燃烧火焰会变得不稳定.为解决这个问题,三菱重工公司成功地开发出了燃烧火焰稳定性好的新型废气再燃烧烧嘴,即使废气的浓度为12%(湿体积)时这种烧嘴也能进行稳定的着火燃烧。本文介绍其试验结果。 相似文献
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