共查询到18条相似文献,搜索用时 140 毫秒
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对抽鼓式U型辐射管烧嘴进行了实验研究,通过实验得到辐射管内零压面的调节手段。实验表明,采用鼓风和吸风相结合的供风方式,同时添加分级燃烧装置,能够在保证辐射管内负压的前提下,提高换热器预热温度和温度效率,改善辐射管的表面温度分布。同时分级燃烧对抑制NOx的生成有重要的作用。 相似文献
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介绍了自身预热式Ⅰ型辐射管烧嘴的基本结构与工作原理,采用燃烧实验方法研究自身预热式Ⅰ型辐射管烧嘴,得到了烧嘴的点火性能曲线;对辐射管表面温度均匀性进行了分析,对烧嘴卷吸回流结构对NOx排放的抑制作用进行了研究,得到了不同负荷下空气预热温度、排烟温度及各测点炉膛温度的变化,为该类型烧嘴的工程实际应用提供了良好的调试依据。 相似文献
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分析了国内外关于连续式蓄热燃烧技术及自蓄热燃烧器的研究现状与应用情况,针对自蓄热式燃烧器普遍存在的燃气"短路"现象,提出三种自蓄热式高温空气燃烧器结构方案,并通过Fluent软件对几种形式的燃烧器在辐射管上进行了冷态模拟。结果表明:在自蓄热燃烧器上对空气和烟气通道做变径,在变径处的侧面上开孔,这种结构形式可以有效的削弱气体"短路"现象,火焰的体积几乎扩散到整个辐射管,火焰的局部高温减少,温度场的分布更加均匀。辐射管沿纵向温度分布均匀,温差较小,NOx的排放浓度可达到50×10-6以下。 相似文献
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对铝卷时效退火炉的燃气加热系统进行研究.重点研究了 U型辐射管沿长度方向的温度分布规律以及二次燃烧对NOx排放的影响.试验表明,使用可靠、实用的烟气二次燃烧系统,能有效改变辐射管的表面温度分布,辐射管的表面最大温差降低,提高设备的温度均匀性,同时降低了 NOx的排放,减少对环境的污染. 相似文献
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介绍了攀钢连续热镀锌机组中退火炉辐射管的应用特点,并对U型辐射管和W型辐射管的热效率、表面温度分布及使用寿命等技术性能进行了深入的分析。 相似文献
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《Baosteel Technical Research》2010,(Z1):111
High Temperature Air Combustion(HTAC) based on regenerative theory has been used in developed countries in recent years,it has many advantages such as efficient recovery of waste heat,high temperature preheating air,low pollution discharge,and so on.This Technology can be used in various furnaces in mechanical,petroleum,chemical industry.To rebuild traditional radiant-tube combustion system with HTAC technology has become important.In the transformation process,The biggest difficulty encountered is that the stability of burner combustion and control system. Because the exhaust gas heat is absorbed by the regenerator,exhaust gas discharge can be controlled at a very low temperature to realize maximum waste heat recovery.At the same time,it improves the temperature uniformity and improve the heating intensity.Thermal efficiency of the device can reach more than 80%.And compared to the traditional air preheating,21.55%energy can be saved. Revamping on traditional radiant-tube combustion system is technically feasible,but a lot of problems will be involved since the rebuild work is on the old system,this article discusses on the main problem encountered in rebuild process in site. to optimize temperature control and obtain not so high exhaust gas temperature,digital combustion control system is necessary.This control loop consists of big loop and small loop,Big loop controls the load distribution of all burners in each heating zone.Small loop controls each heating zone burner’s burning time. Compared performance of tradition radiant-tube heater with regenerative radiant-tube heater,result that regenerative radiant-tube heater have many advantage in consume fuel.Accordance with experience of replacing tradition radiant-tube heater with regenerative type,give a proposition in combustion control system, pilot burner,flame detection and prevent trouble to rebuild work of CAPL and CGL. It is recommended to use regenerative combustion technology in new annealing Line.Although the investment is 1/3 much more than the traditional combustion system,the energy saving effect is obvious and operating costs decreases.Revamping can be taken step by step according to different heating zones.Although taking a long time,it is safer and it influences the production less. Regenerative combustion burner revamping has become successful.However,the revamping work on different furnaces,particular on continuous annealing furnace with high request for temperature control,need further exploration and research. 相似文献
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采用自主研发的比色高温监测系统,实时检测板坯表面温度,依据热传导理论建立了加热炉钢坯加热过程的数学模型,采用有限元法对数学模型进行了离散化分析,开发了钢坯内部中心温度随表面加热过程变化的数值模型。根据检测的钢坯表面温度及开发的数值模型实时通过有限元法[1]估算钢坯中心温度,与传统的通过热电偶探测相比精确了0.46%~0.53%[2];同时根据检测的钢坯表面与中心温差对实时建立温度补偿模型起到辅助作用,同时可以将温度补偿数据实时传递给燃烧优化控制系统,从而建立了基于钢坯表面温差补偿模型的燃烧优化控制,优化调整燃烧工艺,保证了钢坯加热质量,实现了节能降耗和效益提升。 相似文献
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为降低圆电极锭表面顺裂对电渣重熔的影响,从浇注温度、浇注速度、钢锭模温度三个方面进行了系统分析,并制定对应措施,电极圆锭表面顺裂发生率明显下降。 相似文献