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以某厂板坯步进梁式加热炉为背景,建立了数学模型,计算出了在相同炉温制度下,普碳钢与某型不锈钢的升温过程,对不同钢种、不同规格的钢坯在炉内混装加热的可行性进行了初步探索。 相似文献
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运用钢坯加热计算研究不同材质,不同尺寸的扁钢坯在步进式加热炉中加热时温度场的变化规律,辅助设计了几种合金钢坯的加热工艺,为合金钢坯在新建的步进式炉中加热提供了可靠的工艺曲线。实际应用效果良好,实现了节能,并提高了生产率。 相似文献
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处理不同入炉温度的钢坯需采用合理的加热时间和工艺,针对此问题,采用数值模拟的方法研究人炉温度分别为200,400,600,700℃的钢坯最佳加热时间和加热质量。通过利用Fluent流体计算软件建立了钢坯非稳态导热模型和氧化烧损模型,模拟结果表明:在相同的加热工艺下,钢坯人炉温度为27℃,炉内停留时间为180min时,位于预热段的第5块钢坯表面受到的辐射热流最大,达到92kW/m^2,出炉钢坯氧化率为1.419%;钢坯入炉温度为200℃时,合理的炉内停留时间为150min,出炉温度达到1183℃,出炉钢坯氧化率为1.307%。 相似文献
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加热炉的数学建模和数值模拟是一项困难的工作,因为其几何结构的复杂性以及所涉及的传热和燃烧现象。离散煤粒燃烧和钢坯的周期性瞬态运动进一步加剧了这一复杂性。对煤粉燃烧器的推钢式钢坯加热炉进行三维模拟,利用商用软件ANSYS Fluent 15.0对炉内流体流动和传热进行了数值模拟,并编制了炉内三维瞬态程序,对周期性移动钢坯内的热扩散进行了数值模拟。然后,采用迭代法,通过对炉和钢坯的耦合模拟,对实际过程进行建模。这种耦合大大减少了计算量,对精度影响不大。通过将结果与实际设备的数据进行比较,模拟结果与实验数据基本吻合,即所提出的方法适用于模拟系统。 相似文献
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分析了CSP工艺中辊底式加热炉及炉中板坯的换热特性,建立了板坯换热的二维非稳态数学模型,用差分法计算出了加热炉中不同时刻板坯断面的温度场,给出了板坯在加热炉中的温度变化曲线,为优化加热炉的加热制度提供了理论依据。 相似文献
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以传热学有关理论为基础,建立炉缸炉底二维传热数学模型,应用ANSYS软件求解得到济钢2^#高炉所采用的陶瓷杯内衬结构的温度场分布;同时应用该软件分析了中心堆积时炉缸炉底温度场的分布。结果表明E向陶瓷杯侵蚀严重;中心堆积缸炉底温度场分布有较大影响。 相似文献
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Jung Hyun Jang Dong Eun Lee Man Young Kim Hyong Gon Kim 《International Journal of Heat and Mass Transfer》2010,53(19-20):4326-4332
In this work, the development of a mathematical heat transfer model for a walking-beam type reheating furnace is described and preliminary model predictions are presented. The model can predict the heat flux distribution within the furnace and the temperature distribution in the slab throughout the reheating furnace process by considering the heat exchange between the slab and its surroundings, including the radiant heat transfer among the slabs, the skids, the hot combustion gases and the furnace wall as well as the gas convection heat transfer in the furnace. In addition, present model is designed to be able to predict the formation and growth of the scale layer on the slab in order to investigate its effect on the slab heating. A comparison is made between the predictions of the present model and the data from an in situ measurement in the furnace, and a reasonable agreement is found. The results of the present simulation show that the effect of the scale layer on the slab heating is considerable. 相似文献
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《International Journal of Heat and Mass Transfer》2007,50(19-20):3740-3748
A mathematical heat transfer model for the prediction of heat flux on the slab surface and temperature distribution in the slab has been developed by considering the thermal radiation in the furnace chamber and transient heat conduction governing equations in the slab, respectively. The furnace is modeled as radiating medium with spatially varying temperature and constant absorption coefficient. The steel slabs are moved on the next fixed beam by the walking beam after being heated up through the non-firing, charging, preheating, heating, and soaking zones in the furnace. Radiative heat flux calculated from the radiative heat exchange within the furnace modeled using the FVM by considering the effect of furnace wall, slab, and combustion gases is introduced as the boundary condition of the transient conduction equation of the slab. Heat transfer characteristics and temperature behavior of the slab is investigated by changing such parameters as absorption coefficient and emissivity of the slab. Comparison with the experimental work show that the present heat transfer model works well for the prediction of thermal behavior of the slab in the reheating furnace. 相似文献
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介绍氮基气氛辊底炉热处理生产线的设计特点,该生产线消化吸收国外先进技术,性能优越,主要用于轴承零件的淬、回火。 相似文献
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细致研究了CSP工艺中连铸,均热保温缓冲及其连轧过程对板坯/轧板传热的影响,建立了薄板生产热过程中板坯/轧板温度变化规律的二维非稳态数学模型,通过较精确研究连铸过程中坯壳-结晶器交界面传热,均热热保温过程辐射换热及其连轧过程中轧板-轧辊交界面传热模型,确定板坯/轧板在CSP过程中的复杂边界条件,模型计算结果与邯钢CSP生产线板坯实例数据相吻合。 相似文献
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《Applied Thermal Engineering》2003,23(16):2079-2087
A mathematical model for on-line prediction of bottom and hearth in blast furnace by particular solution boundary element method was established. A nonlinear heat conduction problem was considered. In particular, Kirchhoff transformation was used for nonlinear heat conduction. A good agreement between computed and measured results is obtained. 相似文献