CSP板坯加热工艺的优化

系统地介绍了武钢CSP板坯加热炉的设备状况。基于CSP加热炉的生产特点,分析了加热工艺与炉辊质量对产品质量的主要影响。从优化板坯加热工艺制度与燃烧控制入手,开展了较为全面的改善CSP板坯加热质量、降低炉内氧化烧损和能耗的研究,并在武钢CSP加热炉上取得了提高板坯加热质量、降低氧化烧损与煤气消耗的优良效果。     

CSP薄板坯连铸连轧热过程的数值模拟

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。     

连铸连轧辊底式加热炉薄板坯的温度场计算

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。     

轧钢用炉余热利用的经济效益

轧钢用炉的余热利用能获得三方面的经济效益:降低产品成本、增强生产能力及可采用低热值燃料。对高温的余热加以利用可以大幅度地节约能源。本文着重探讨均热炉、板坯或方坯加热炉、热处理炉所用换热器。     

均热炉燃烧系统改造方案的数值模拟研究

应用高温空气燃烧技术改造传统均热炉燃烧系统,可以节约燃气的消耗率,提高炉内温度场的均匀性。本文通过数值模拟试验,研究了某厂均热炉应用高温空气燃烧技术改造后的炉内流场和温度场,从而提出了优化改造方案。     

不同锭型及热负荷下均热炉内对流换热系数的模拟分析

均热炉是钢锭轧前加热过程的主要设备,其炉内的对流换热对于钢锭的加热过程有着很大的影响。文中以均热炉内对流换热过程为研究对象,通过对模拟研究得到了不同锭型在不同热负荷下加热过程中表面对流换热系数的变化情况,为钢锭加热过程工艺优化提供了基础。     

板坯加热炉内加热特性的数值分析

以某公司热轧厂常规与双蓄热烧嘴组合供热的板坯加热炉为研究对象,建立该加热炉炉内流动、传热、燃烧和板坯运动吸热过程的三维物理数学模型,运用CFD仿真技术对其进行详细的数值计算,得到炉内稳态的速度场和温度场分布规律、板坯的升温曲线以及板坯温度分布均匀性,计算结果与"黑匣子"实验测量数据吻合良好。本文给出的板坯加热特性计算方法为研究加热炉新工艺、优化板坯加热温度制度提供了科学依据。     

板坯加热炉内常规燃烧与富氧燃烧数值计算对比分析

以某公司热轧厂板坯加热炉为研究对象,建立该加热炉内流动、传热、燃烧和板坯运动吸热过程的三维物理数学模型,运用CFD仿真技术对其进行详细的数值计算,重点对比分析了常规燃烧和富氧燃烧特性,得到了各自的炉内速度场和温度场分布规律、板坯的升温曲线以及板坯温度分布均匀性,计算结果与“黑匣子”实验测量数据吻合良好.总结出的富氧燃烧...     

换向时间对蓄热式均热炉能耗的影响和分析

通过数值模拟和实验方法,重点研究了换向时间对蓄热式均热炉能耗的影响。结果表明:蓄热式均热炉存在最佳换向时间,蓄热式均热炉在最佳换向时间下工作时可以显著降低能耗;换向时间影响换向盲区的煤气损失量;如根据均热炉实时烟气流量和排烟温度动态调节换向时间,可进一步降低均热炉的能耗。     

初轧生产中钢淀液芯加热的节能效果

<正> 在初轧生产过程中均热炉能耗较大,一般占初轧工序能耗的70％以上。因此,降低均热炉的能耗尤为重要。均热炉节能途径很多,一般分为两个方面,即工艺制度的改革和均热炉设备的改造。前者对生产企业来说具有更大的实际意义。     

A heat transfer model for the analysis of transient heating of the slab in a direct-fired walking beam type reheating furnace

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.     

Investigation of the slab heating characteristics in a reheating furnace with the formation and growth of scale on the slab surface

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.     

CSP薄板坯连铸连轧辊底式加热炉

通过生产实践，对CSP辊底式加热炉的功能、炉型结构进行分析讨论。     

A Coupled Numerical Study of Slab Temperature and Gas Temperature in the Walking-Beam-Type Slab Reheating Furnace

In the present study, a three-dimensional simulation is performed for the turbulent reactive flow and radiactive heat transfer in the walking-beam-type slab reheating furnace using STAR-CD software. The geometric model takes care of all components of the furnace. To obtain a steady solution, the walking beams are assumed fixed in the furnace and the slab is modeled as a laminar flow having a very high viscosity and thus moving at a nearly constant speed. The temperature distributions of the slab and the gas mixture are obtained through a coupled calculation. The simulation results successfully predict the temperature distribution inside the slab and the heat flux on the slab surfaces, providing an opportunity for a full exploration of the influence of the walking beam system on the skid marks. The simulation results show that the radiative shielding by the static beams is the main cause of the skid marks. The heat loss through the skid button to the cooling system worsens the skid marks.     

脉冲燃烧控制用于板坯加热炉的探讨

介绍了脉冲燃烧控制技术在板坯加热炉实际应用中的优势和局限,并对这种技术在板坯加热炉上的应用提出一个新方案.     

辊底式连续热处理炉钢坯二维传热过程数学模型的研究

以某公司拟建的辊底式连续热处理炉为研究对象,在详细分析其传热机理的基础上,针对其钢坯厚度变化较大的特点,建立了钢坯在炉内连续加热和摆动加热过程数学模型,采用数值计算方法对其进行了仿真计算,并利用设计大纲提供的数据间接验证了所建模型的正确可靠性。所开发的辊底式热处理炉计算机数值仿真系统可以动态模拟不同燃料、不同规格的钢坯在炉内的运行状况及其钢坯各典型点的温度变化规律;可以确定在不同的热处理工艺制度下、不同规格的钢坯所需要的最佳运行方式和最佳工艺制度。