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对低温余热制冷技术在韶钢应用的可行性和实施条件进行了分析和探讨,并从经济性方面对余热制冷机组的热源供给方式进行选择,同时详细介绍了轧钢加热炉余热回收系统和低温余热制冷系统的工艺流程,并对低温余热制冷技术在韶钢的应用所产生的预期效果进行了分析。 相似文献
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加热炉烟气余热回收技术及其应用 总被引:1,自引:0,他引:1
本文指出了延长加热炉预热段,采用无水冷滑轧,上下扼流装置,多孔陶瓷板,金属辐射网等节能技术,强化了加热炉预热段的对流给热和辐射给热。使排烟温度降低到了经济排烟温度。改进换热器的结构,设置FH烟气加热器、多缝热风采暖装置等,能有效地提高助燃空气的预热温度,充分地回收烟气余热。 相似文献
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加热炉烟气余热回收技术及应用高学新(莱芜钢铁总厂特殊钢厂机动科,莱芜271105)TechniqueandApplicationofEffluentGasesHeatRecoverofAHeatingFurnace¥GaoXuexin(Special... 相似文献
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低温工业余热回收的热泵技术 总被引:5,自引:0,他引:5
文内简述了热泵节能原理,较详细阐述了宝钢第一套利用工业余热的蒸汽电动压缩式水-水热泵装置开发和应用的实践,并对宝钢推广应用热泵技术的可行性进行了分析。 相似文献
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加热炉烟气余热充分自回收的探讨 总被引:1,自引:0,他引:1
指出了改进加热炉预热段结构、强化其对流给热和辐射给热是加热炉烟气余热自回收的重要途径之一。通过改进片状管换热器及其附属设施的结构,在片状管换热器后面设置多缝热风采暖装置,在换热器面积较小、炉尾排烟温度650~760℃的条件下,使预热助燃空气的温度稳定地达到了410℃左右,获得了增产节能的效果。 相似文献
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《Baosteel Technical Research》2010,(Z1):134
Stainless steel continuous annealing furnace is mainly used for heat treatment of hot-rolled strip steel.The combustion air will be enabled to heat to 520℃by waste heat recovery system,but the discharge temperature is still up to about 300℃.Owing to with development of global emphasis on energy conservation energy saving and discharge reduction,it’s significant to lower the discharge temperature to below 200℃, for the sake of achieving rational use of waste heat resource.Through the analysis of the existing heat recovery system by this study,it is proved that mixing low temperature with flue gas in high temperature standard will increase the capacity of the flue gas and deteriorate the quality of remaining heat resource.In stead of that,increasing the combustion air temperature to 600℃on the basis of stability temperature for the prerequisite of recuperator design,and giving priority to reducing fuel consumption are the better way.The recovery and recycle of low temperature gas are also be introduced.It is demonstrated by the way of setting a secondary recuperator at the exit of the primary recuperator,and using low temperature flue gas to heat the air used for drying the strip steel,the exhuast temperature of flue gas can be reduced to lower than 200℃.At the same time,the steam required for heating air is saved,the energy reserve as high as 2 300 t of standard coal per year. 相似文献
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针对电炉高温烟气余热含尘、波动特点,提出辐射水冷沉降除尘与对流换热相结合的余热锅炉技术方案,同时采用蓄热技术有效减缓电炉烟气波动对余热蒸汽回收稳定性的影响。分析表明,通过电炉余热回收技术方案的实施可产生良好的经济和社会效益。 相似文献
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分析了高炉软水密闭循环冷却系统特点,采用吸收式热泵技术回收高炉软水低温余热用于采暖。技术上可行,经济、社会效益和环境效益显著。既满足北方钢铁企业自身采暖需求,又缓解北方钢铁企业冬季蒸汽紧张的局面,富裕热量还可外供附近市政采暖。 相似文献
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K. s. Chapman S. Ramadhyani R. Viskanta 《Metallurgical and Materials Transactions B》1991,22(4):513-521
A mathematical system model of a direct-fired continuous reheating furnace has been developed. The furnace is modeled as several
well-stirred gas zones with one-dimensional (1-D) heat conduction in the refractory walls and two-dimensional heat transfer
in the load. The load travels either parallel or counterflow to the combustion gases which enter the furnace throughout its
length. The convective heat-transfer rate to the load and refractory surfaces is calculated using existing correlations from
the literature. Radiative heat exchange within the furnace is calculated using Hottel’s zone method by considering the radiant
energy exchange between the load, the combustion gases, and the refractories. The nongray characteristics of the combustion
gases are considered by using a four-gray gas model to treat the mixture as a radiatively participating medium. An extensive
parametric investigation has been completed to determine the furnace design and operating characteristics that lead to optimum
furnace efficiency. The parametric investigations included in this paper study the effects of the load and refractory emissivities
and the height of the combustion space on the thermal performance of the furnace. 相似文献
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蓄热式加热炉在煤气换向阀切换为抽烟气时,烧嘴内的残余煤气与高温烟气发生二次燃烧,导致烧嘴局部温度瞬间高于蓄热体的最高使用温度,在高温和氧化铁粉末的共同作用下会造成煤气烧嘴第1层蓄热体出现开裂、变形、气孔堵塞的现象。研究了在加热炉上增设一套烟气反吹系统以解决蓄热体局部过烧的问题。实际应用效果表明,该系统以低温烟气将煤气烧嘴及支管内的残余煤气置换到炉内进行燃烧,不仅能杜绝煤气在烧嘴内发生二次燃烧,有效地控制蓄热体温度,延长其使用寿命,还能大幅度降低烟气中CO的含量,减少化学能耗损失和环境污染。 相似文献
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以中板174m^2蓄热式空煤气双预热连续加热炉为原型,建立了高效陶瓷蓄热体的三维非稳态流动及传热数学模型,采用数值分析的方法对蓄热体在不同换向周期条件下的热工特性进行了研究。结果表明,随着换向周期的延长,蓄热体出口烟气的平均温度逐渐升高,空气和煤气的出口平均温度逐渐降低;在相同的换向周期下,空气换热器蓄热体内的最高温度比煤气换热器蓄热体内的最高温度高,过长的换向周期也会引起蓄热体内较大的温度波动;换向周期对平均余热利用效率和平均温度效率都有较大的影响,其最佳换向周期应定在60s左右。 相似文献