全氢强对流罩式炉退火工艺设计系统研究.pdf

南京理工大学
硕士学位论文
全氢强对流罩式炉退火工艺设计系统研究
姓名:丁非
申请学位级别:硕士
专业:材料学
指导教师:樊新民
20090531
硕上:论文
全氢强对流罩式炉退火T艺设计系统研究
摘要
本文以全氢强对流罩式炉退火工艺过程的传热特点为基础,结合传热学和流体力
学,建立了以钢卷温度计算为核心的退火热过程数学模型,并将该模型与用 Visual Basic
语言编制的界面程序相融合,开发出了 HICON/H2罩式炉退火工艺设计系统。在输入钢
卷、燃料及炉体各部件等尺寸和物性参数后,可以通过模拟计算得到钢卷的退火工艺和
温度曲线,将计算结果与奥地利平台结果进行了对比验证,结果表明,该系统合理,可
靠
本文对全氢罩式退火炉内的主要传热和设计参数进行了深入的研究。设计系统经过
模拟计算给出了内罩空间保护气体的流速分布,为钢卷传热模型提供了准确的边界条
件:本文还着重介绍了钢卷传热的两个重要参数-对流换热系数和径向导热系数,对比
了不同气氛条件下的数值,从机理上阐明了全氢炉的优越性;此外就循环风量对退火时
间的影响进行了分析,证明了变频风机设计的合理性和优越性。
另外,本文还分析了钢卷及燃料参数对钢卷退火的影响,研究结果表明,钢卷退火
时间随着板宽和垛重的增加而延长;对两种常用燃料的分析结果表明,天然气是比较合
理的然料选择,但燃料的最终选择要综合企业管理、用气成本及产品价格等多方面因素
来确定。
关键词: HICON/H2罩式炉,全氢,退火工艺,传热,数学模型,设计系统
Abstract
硕上:论文
Abstract
Based on the characteristics of heat transfer in HICON/H fumace, a mathematical model
was proposed to calculate the annealing process, together with heat transfer theory and
hydromechanics. Then an intelligent control system of annealing process in HICON/H2
furnace was developed by using Visual Basic in the mathematical model. After importing the
dimension parameters and physical properties of rolling coils, fuel and annealing furnace, the
temperature distribution of steel coils in the whoe annealing process was achieve
Furthermore, the annealing urves of the coils and the temperature evolution of hydrogen and
inner cover, close relative to the temperature of coils, was calculated in the system. The
numerical results had a good agreement with the Austrian platform
In addition, this paper finely anal yzed the parameters which had great eftect on the heat
transfer on the heat transfer in the furnace. Circulation of the safety atmosphere in the inner
cover was studied to provide accurate boundary conditions for calculating the temperature
field of the coils. Two parameters, the convection heat transfer coefficient and the equivalent
radial thermal conductivity, which were important to heat transfer in HCON/H furnace also
was studied. Through the contrast studies in different atmosphere, it was shown that the use of
HICON/H2 annealing technology can enhance the heat conduction inside steel coils and
improve the heat transfer conditions outside the coils. The circulation flux of annealing
atmosphere gas was optimized by using the control system. By means of substantial
numerical calculation, the frequency conversion circulation flux was proved the optimum
value of circulation flux
Besides, the impact of steel coil and fuel parameters on annealing process was also
anal yzed. The results showed that the annealing time of steel coil prolonged with the
of width and weight of plates. The research on two wildly-used fuel revealed that natural gas
was the proper choice. However, the following factors should also be considered in choosing
fuel: enterprise management, gas consumption cost and product price.
Key word: HICON/H2 furnace, 100% hydrogen, annealing process, heat transfer
mathematical model, design system