共查询到18条相似文献,搜索用时 203 毫秒
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直通式辊底加热炉传热数学模型研究 总被引:5,自引:0,他引:5
通过分析CSP工艺中直通式辊底加热炉的热工及结构特性,采用区域法建立各区域的辐射能量平衡方程,并与加热炉内连铸坯的二维瞬态导热模型相耦合,建立长一维直通式辊底加热炉炉内传热数学模型.通过对数学模型的求解,研究分析了加热炉内炉气、板坯温度分布的变化规律. 相似文献
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采用CFD数值模拟的方法以加热炉内炉气与钢坯的热量交换为研究对象,建立不同燃料配比情况下炉气在炉内传热过程以及钢坯加热过程的数学模型;并探讨步进式加热炉内钢坯运动轨迹同炉膛温度分布的合理匹配方案,从而合理地组织燃料燃烧,达到节能降耗的目的.研究表明,随着高炉煤气中焦炉煤气比例的增加,钢坯的平均温度增加;钢坯的换热效率略... 相似文献
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分析了CSP辊底式加热炉温度控制的特点,指出影响坯料温度的因素、温度变化状况;对影响板坯加热的主要技术因素进行了初步研究,并介绍了该炉型板坯温度的控制方法与经验。 相似文献
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建立步进式加热炉内流动、燃烧和传热的数学模型。炉内流场的模拟采用k-ε双方程模型,辐射换热计算采用P-1辐射模型,气相燃烧采用Species Transport模型,流场计算采用Simpler算法。采用上述模型与算法得到了炉内详细合理的温度、速度和浓度分布,并对其中影响板坯加热的温度场进行了实验验证。 相似文献
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针对推钢式板坯加热炉,建立加热炉内气体流动、燃烧和传热过程数学模型.采用计算流体力学(CFD)商业软件Fluent模拟得到加热炉炉内的温度场、流场以及反应物和生成物浓度分布.结果表明:通过预热空气至350℃和预热煤气至50℃,平均炉温能够达到1300℃,满足钢坯加热温度要求.由于加热炉结构复杂,使得炉内有明显的回流,预热助燃空气可以有效提高炉温,燃烧充分时炉子热效率也高.模拟结果对加热炉优化设计及操作都具有重要的参考价值. 相似文献
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A mathematical model has been developed to describe the rate processes in an axisymmetric copper flash smelting furnace shaft.
A particular feature of the model is the incorporation of the four-flux model to describe the radiative heat transfer by combining
the absorbing, emitting, and anisotropic scattering phenomena. The importance of various subprocesses of the radiative heat
transfer in a flash smelting furnace has been studied. Model predictions showed that the radiation from the furnace walls
and between the particles and the surrounding is the dominant mode of heat transfer in a flash smelting furnace.
Formerly Graduate Student, Department of Metallurgical Engineering, University of Utah. 相似文献
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T. Bourgeois R. T. Bui A. Charette Y. S. Kocaefe 《Metallurgical and Materials Transactions B》1989,20(3):421-429
A mathematical model has been developed for the combustion chambers of aluminum casting furnaces by combining the fluid flow
code PHOENICS with a zone model for the radiative heat transfer analysis and a simplified flame model. It offers flexibility
in specifying the size and the combustion and heat transfer characteristics of the furnace. Thus, the model can be used to
study a combustion chamber under different operating conditions and for different design op-tions. This paper presents the
model and describes the coupling mechanism between PHOENICS and the zone method. Various case studies have been carried out
for a 72-ton melter-holder. Results are presented which show the negative effect of ambient air inleakage on furnace per-formance
as an application example.
T. BOURGEOIS, Formerly Graduate Student. 相似文献
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The detailed process of the heat transfer of the cooling stave in blast furnace (BF) has been systematically analyzed and the simplified mathematical model was constructed based on heat transfer theory. Precise definitions of the cooling capacity, stable working slag thickness and safe working slag thickness were put forward so as to evaluate the cooling capacity of cooling stave systematically. The results show that 95% of heat is carried off by cooling water through convection and the heat taken away through convective heat transfer between furnace shell and atmosphere only account for 5%. The entire heat transfer process can be divided into four modules and the cooling system is divided into three parts. The cooling capacity φ is defined and function curve of temperature of cooling stave hot surface Tb with changes of brick thickness is drawn and the safe working area and stable working area are put forward. 相似文献