CSP均热炉内板坯传热数值模拟研究

针对武钢CSP均热炉内板坯的传热进行了数值模拟研究,对板坯在炉内的热状态、板坯断面温度场进行了分析,为CSP均热炉加热工艺的优化提供了参考依据。     

连铸板坯热装工艺节能效果分析

利用二维板坯加热数模对板坯加热过程热行为的模拟，探讨了热装温度对加热炉单位热耗、炉子产量及氧化烧损的影响。在热装条件下，加热炉在最优生产率条件下运行时，既能大幅度降低能耗又能明显减少板坯的氧化烧损。     

轧钢加热炉温度均匀性和氧化烧损的优化

某1 700线加热炉经过5年多的生产实践,存在沿板坯长度方向温度均匀性较差和氧化烧损率偏高的问题。通过出钢端斜炉底改造、更换高温区的耐热滑块、均衡南北供热负荷、合理控制炉压、调整空燃比等方案的实施,使得板坯沿长度方向温差降到30℃以下,板坯的氧化烧损率降到0.95%,很大程度上提高了加热炉的技术水平和加热质量。     

降低板坯氧化烧损的研究

通过调查分析板坯加热工艺,找到影响板坯烧损的因素,并采取相应的技术措施,使板坯氧化烧损得到了有效控制。     

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。     

轧制前连铸钢坯的节能加热制度

在连续式加热炉中,节能加热制度的实现归结为可控参数能维持保证最低的加热成本。为了使燃料消耗和氧化烧损达到最小值,必须提高炉子后面几个加热段或最终加热期的加热强度。以板坯加热炉为例讨论了节能供热制度和温度制度。     

加热炉降低氧化烧损的实验研究

以某加热炉为研究对象,研究加热炉加热制度、炉内加热气氛对钢坯氧化烧损的影响,并依据实验结果对水钢加热炉加热制度进行合理优化,达到减少钢坯氧化烧损,降低生产成本的目的。通过本研究,加热炉钢坯氧化烧损得到了明显的控制。     

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。     

环形炉坯料氧化烧损的影响因素及改善措施

通过对坯料氧化烧损的机理分析,找出影响坯料在环形加热炉内氧化的主要因素,并提出利用控制炉内气氛、缩坯料加热时间和准确控制坯料的加热温度等几种方法来达到减少坯料在环形加热炉内的氧化烧损。应用以上的理论分析,通过坯料加热仿真模拟计算,并结合环形加热炉生产实际情况,采用控制空燃比、实现快速加热、优化加热制度和工艺参数来解决坯料在加热炉内大量氧化烧损的问题。     

武钢热轧总厂二分厂1~#加热炉改造实践

通过对武钢热轧总厂二分厂1~#加热炉的改造性大修,优化了加热炉炉型结构,升级了加热炉燃烧系统设备及控制系统,改善了炉区操作环境。改造后的1#加热炉经过近1a的运行,能耗显著降低,加热质量明显提高,操作环境有效改善,达到了改造预期目的。     

Efficiency analysis of radiative slab heating in a walking-beam-type reheating furnace

The thermal efficiency of a reheating furnace was predicted by considering radiative heat transfer to the slabs and the furnace wall. The entire furnace was divided into fourteen sub-zones, and each sub-zone was assumed to be homogeneous in temperature distribution with one medium temperature and wall temperature, which were computed on the basis of the overall heat balance for all of the sub-zones. The thermal energy inflow, thermal energy outflow, heat generation by fuel combustion, heat loss by the skid system, and heat loss by radiation through the boundary of each sub-zone were considered to give the two temperatures of each sub-zone. The radiative heat transfer was solved by the FVM radiation method, and a blocked-off procedure was applied to the treatment of the slabs. The temperature field of a slab was calculated by solving the transient heat conduction equation with the boundary condition of impinging radiation heat flux from the hot combustion gas and furnace wall. Additionally, the slab heating characteristics and thermal behavior of the furnace were analyzed for various fuel feed conditions.     

改善高线加热炉加热质量的技术措施

针对棒线材加热炉在加热质量方面存在氧化烧损及脱碳情况方面损耗量大、加热温度均匀性差等问题,采用全平焰烧嘴、精细化供热分段等多种技术措施,达到进一步改善棒线材加热炉加热质量的目的。     

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...     

环形加热炉燃耗影响因素分析及降耗措施

以包钢集团包头无缝钢管厂36m环形加热炉改造项目为例,通过分析指出加热温度、加热时间、热损失、负荷率、炉型结构、设备预留能力等是影响环形炉燃耗的主要因素,并从炉型设计、燃烧控制、生产工艺制度等方面给出具体的降耗措施。经过1年的生产实践证明,管坯氧化烧损少,加热质量好,燃料消耗低,环境污染少。     

钢坯加热新工艺及计算机辅助设计

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、辅助设计了几种台金钢坯的加热工艺，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。     

Heat loss into ground from a slab‐on‐ground structure in a floor heating system

The objective of this research was to determine the actual heat loss into the subsoil from a massive slab‐on‐ground structure in a low temperature floor heating system. The main objective was achieved by field test measurements of an actual new building in Southern Finland. The test building is a detached house including a massive concrete slab, an underneath polystyrene insulation and a crushed stone fill layer on top of the clay subsoil. The heat loss into subsoil is determined from the measured temperature difference over the slab cross‐section during a 1‐year measuring period. The long‐term behaviour of the structure was also studied by numerical simulations using 2D FE‐modelling. According to the field test results and the simulations, the increase of the slab temperature in winter increases significantly the flow rates into the subsoil, also at the central part of the slab. Theoretical calculations for a standard building show that the heat loss into the subsoil from slab‐on‐ground structures is a significant part of the total heat loss from a building and the intensity of the heat loss is strongly dependent on the average temperature of the slab structure. The effect of the various floor heating systems on the total energy consumption of a building should be taken into consideration when designing the thermal insulation of ground slabs. Copyright © 2005 John Wiley & Sons, Ltd.