共查询到19条相似文献,搜索用时 109 毫秒
1.
对高炉炉缸和炉底的侵蚀机制、合理的炉缸结构、炉缸和炉底内衬结构及其耐火材料进行了较为全面的介绍,同时建议在高炉生产过程中采取一系列措施来提高炉缸、炉底的寿命:拥有合理的死铁层深度、炉缸高度和铁口深度的炉缸结构,可为高炉高效长寿和生产的稳定顺行奠定良好基础;根据高炉顺行情况和炉缸、炉底侵蚀状态控制好生铁成分,并采取有效措施减少碱金属等有害元素在炉内的富集及对炉缸、炉底的侵蚀;在线进行压浆能有效消除炉缸砖衬间的缝隙,提高炉缸冷却系统的冷却效果,减缓炉缸砖衬的侵蚀;加含钛物料护炉可以使侵蚀严重的炉底、炉缸转危为安,显著提高高炉寿命。 相似文献
2.
考虑相变传热的炉缸传热模型的研究与应用 总被引:3,自引:1,他引:2
为了更准确地模拟高炉炉缸炉底的侵蚀状况,建立了考虑相变传热的非稳态炉缸炉底传热模型,并对不同的凝固潜热处理方法进行了比较.重点研究了修正温度回升法和潜热作为源项的处理方法,给出了不同潜热处理方法的使用条件.计算结果表明,与传统的不考虑凝固潜热的模型相比,考虑相变传热的模型能够更加准确地模拟炉缸实际侵蚀状况.应用潜热作为源项处理的模型对武钢l号高炉炉缸炉底的温度场进行模拟,并与热电偶实测温度进行对比,模拟结果与实测温度非常接近,平均温差小于10℃.该模型能够很好地模拟高炉炉缸炉底的侵蚀状况. 相似文献
3.
4.
介绍了俄罗斯博洛维奇耐火材料股份有限公司生产的用于高炉炉底的莫来石制品.这种制品具有优良的物理化学性能,并能延长高炉的使用寿命. 相似文献
5.
6.
7.
8.
以无功传热强化技术为基础,简要回顾了换热管传热强化的研究进展,对管内对流传热强化的应用进行了介绍。基于水套炉中换热管束的结构特性和管内介质物性,提出水套炉的换热管传热强化技术的影响因素。最后对管外传热强化进行了讨论。 相似文献
9.
10.
随着强化传热拽术的不断发展,近年来国内外已研制出多种类型的异形强化管,例如螺旋槽管、横纹管、缩放管、双面整体型低翅片管等。有的强化管具有管内外两侧同时强化流体对流传热的作用,例如缩放管等,特别适合于硫酸生产中的二氧化硫气—气换热。在湍流条件下,流体对流传热热阻集中于近壁处流动滞流底层中,当各种强化管选取最佳的表面粗糙度尺寸,就能获得良好的强化传热效果,即以较低的流体输送功耗为代价,获取较高的对流给热系数,以此提高换热器的传热性能。 相似文献
11.
An advanced model has been developed to track iron and slag levels in the blast furnace hearth. The model is based on measurements of tapped quantities of iron and slag and standard blast furnace measurement variables. The hearth geometry is provided by a previously presented wear model of the hearth refractory, while the floating state of the hearth coke column—the dead man—is estimated from a simplified force balance. The liquid level estimation problem is tackled by an extended Kalman filter, by which the variance of the measurements and parameters can be optimally considered. The results of the model clearly show the dramatic effect of the floating state of the dead man on the tap-cycle evolution of the liquid levels in the hearth, and therefore point out the importance of applying a proper estimate of the hearth geometry in the model. The findings of the model have been analyzed with respect to the asymptotic limit of the descent below the taphole of the iron-slag interface and the required corrections of the material balances. The model has also been verified by a comparison of its results with the tap-cycle trend of the gas pressure drop over the furnace. 相似文献
12.
The aim of this research is to numerically simulate iron flow and heat transfer in the hearth of a blast furnace by solving the three-dimensional turbulent Navier-Stokes equation coupled with the transport equation of energy at steady state. Under the effects of conjugate heat transfer and natural convection, a computational fluid dynamic calculation was performed to generate flow field in the hearth and the temperature distribution in the refractories during the tapping process. The accuracy and computation of the model is validated using operation data from BHP Steel's No. 5 blast furnace. The shear stress and heat flux on the wall were then predicted for the different vertical movements, shapes of the coke zone (dead-man), and the lengths of the tap-hole. As shown in the results, it is worth noticing that an increase in the tap-hole length causes the peak values of shear stress to shift in the increasing azimuthal direction at a particular plane, and the location of the peak value of shear stress coincides with the location of higher temperature actually measured on the hearth wall, signifying enhanced heat transfer to the wall at location of peak stress. 相似文献
13.
14.
15.
16.
17.
18.
以矾土熟料为骨料和掺合细粉,加入适量辅料及添加剂,12.2%的水及0.2%的减水剂,配制出的压入料具有良好的流动性及可泵性。其体积密度为2.35g/cm3,常温耐压强度22.67MP8,烧后线变化率(1200℃,2h)-0.1%。 相似文献