高导热长寿炉衬材料在高炉上的应用

鞍钢10^#高炉引进美国UCAR热模压碳砖、胶泥、填料等高热导率长寿炉衬材料。紧靠冷却壁砌筑,增强整体导热性,这与我国传统的高炉砌筑定位方法截然不同,高炉炉衬材料、砌筑方式与施工实践值得借鉴。     

螺纹管冷却壁传热分析及结构优化研究

将螺纹管应用于高炉冷却壁,利用Fluent软件建立螺纹管冷却壁数学模型,通过数值模拟对螺纹结构进行了优化。建议螺纹管结构参数：肋条数4,肋高1 mm,肋宽5~7 mm,导程20~30 mm。与普通圆管冷却壁的对比研究表明：在冷却水流速为2 m/s工况下,螺纹管冷却壁热面最高温度下降5.6%,但水管进出口压差增长1.69倍;同等冷却效果下,螺纹管冷却壁可节省冷却水量55%;发生缺水事故时,螺纹管冷却壁热面最高温度下降22.4%,能有效降低缺水危害,保护冷却壁。     

纯燃高炉煤气180t/h高温、高压蒸汽再热炉设计

针对180dh高温、高压全燃高炉煤气再热炉性能特性进行研究，分析了燃用高炉煤气对再热炉的燃烧着火特性、传热特性、热工参数和受热面布置的影响，提出了适用于燃用高炉煤气的再热炉的布置型式，并对其中的一些特殊设计进行了详细说明与分析。     

移动供热:钢铁企业工业废水废热回用新途径

钢铁企业中的高炉炉渣粒化水、转炉煤气清洗水、高炉煤气清洗水含有大量热能。如果能将这部分工业废水的热能回收,对于节能减排将是非常有益的。利用移动供热对高炉炉渣粒化水、转炉煤气清洗水、高炉煤气清洗水等钢铁企业工业废水的废热进行回收和利用,是一种废热回用的新途径,具有广泛的应用前景。1钢铁企业工业废水废热分析高炉炉渣粒化水使用后的水温接近100℃,转炉煤气清     

掺烧煤气协同分级配风对锅炉热量分配的影响

以煤粉掺烧高炉煤气和焦炉煤气的锅炉为研究对象,研究了高炉煤气与焦炉煤气热量掺烧比协同分级配风对锅炉主蒸汽、再热蒸汽吸热量的影响。结果表明:仅掺烧高炉煤气或焦炉煤气对辐射换热量和对流换热量的分配作用相反;同时掺烧高炉煤气和焦炉煤气时,主蒸汽、再热蒸汽吸热量均以对流换热为主,总吸热量均增加;高炉煤气二次风门开度增大会使再热蒸汽吸热量增加,而对于主蒸汽,对流换热量的增加未能抵消辐射换热量的减少;主蒸汽和再热蒸汽的对流换热量均随着煤粉二次风门开度的增大而减少,且随着分离燃尽风(SOFA)风门开度的增大而增加。     

等离子助燃高炉煤气燃烧室模拟研究

利用数值模拟手段探究高炉煤气燃烧室热态场分布规律,并探究了等离子中活性粒子氧原子对高炉煤气燃烧室的热态场影响规律。结果表明:燃烧室内高炉煤气燃料浓度呈U字形分布。在燃烧室的头部燃料喷嘴附近形成高温区,在主燃孔后有少部分的高温区;随着活性粒子的加入,高炉煤气燃烧室头部高温区范围增大,火焰筒内的回流区速度更加均匀,燃烧效率提高,由97.38%增加到99.65%。活性粒子浓度越高,等离子助燃高炉煤气燃料燃烧强化效果会逐渐减弱。     

浅谈高炉煤气锅炉的设计热效率

通过对高炉煤气燃料成分和热值的分析,说明高炉煤气锅炉的排烟热损失很大,直接影响锅炉的热效率。结合给水温度的影响,说明高炉煤气锅炉的热效率不可能很高,并给出了一个合理的范围,同时指出要提高热效率则必须配套其他的辅助设备。     

新型多孔铜微通道热沉散热性能实验研究

新型多孔铜微通道散热技术采用多孔铜微通道结构,增加热沉与冷却工质的接触面积,提高热沉的散热性能。利用单室金属-气体共晶定向凝固工艺,通过控制冷却速度、过热度、气压等工艺参数,从而制备优质的多孔铜材料。根据多孔铜微通道热沉散热原理,搭建散热性能测试平台,研究冷却工质流量、多孔铜材料的孔径和孔隙率、入口截面斜率角对多孔铜微通道热沉散热性能的影响规律。结果表明:增加冷却工质流量有利于提高多孔铜微通道热沉的散热性能;在恒定体积流量下,减小孔径有利于提高多孔铜微通道热沉的散热性能;当多孔铜孔隙率为30.8%时,多孔铜微通道热沉散热性能最佳;入口截面斜率角对多孔铜微通道热沉散热性能的影响较小。     

高炉煤气成份合理选择的新方法

一、前言 为评价高炉热利用水平,确定其热效率等技术经济指标,为改进高炉操作及管理提供依据,往往要对高炉进行热平衡测定和监测,尤其要经常对高炉煤气成份进行比较准确的取样分析以加强操作和管理。但由于高炉生产过程的复杂性和某些参数随时间无规     

1000 MW高效超超临界锅炉分隔屏壁温偏差分析

文中对1 000 MW高效超超临界锅炉分隔屏壁温偏差进行分析,通过模拟总结了热负荷分布规律,并根据热负荷分布,采用差异化设计技术进行流量耦合,对分隔屏进行壁温优化,降低了壁温偏差。     

Conjugate heat transfer analysis of copper staves and sensor bars in a blast furnace for various refractory lining thickness

Lining erosion is the most important factor for determining the campaign life of a blast furnace. To provide information about the heat transfer of the copper stave in the belly of the No. 1 blast furnace at CSC (China Steel Corporation), a conjugate heat transfer model, including the heat transfer of the stave and sensor bar in thermal conduction and radiation transmission from the gas temperature inside the blast furnace and convection heat transfer in cooling pipe, was developed for the steady state process. The simulations focus specifically on the effects of the gas temperature, the geometric thickness of the cooling stave, the slag layer thickness and the material and diameter of the sensor bar. The results show that the refractory lining and the slag shell provide significant protection for the stave body. A copper sensor bar can be used to measure the residual lining thickness of the cooling stave. To estimate a more reasonable stave thickness, several key factors, such as the diameter and material of the sensor bar, were examined in this study. The results can serve as important reference information for blast furnace operation and the prediction of its campaign life.     

Heat transfer analysis of blast furnace stave

The three-dimensional mathematical model of temperature and thermal stress field of the blast furnace stave is built. The radiation heat transmitted from solid materials (coke and ore) to inner surface of the stave, which has been neglected by other studies, is taken into account. The cast steel stave is studied and the finite element method is used to perform the computational analysis with soft ANSYS. Numerical calculations show very good agreement with the results of experiment. Heat transfer analysis is made of the effect of the cooling water velocity and temperature, the cooling channel inter-distance and diameter, the lining material, the cooling water scale, the coating layer on the external surface of the cooling water pipe as well as the gas clearance on the maximum temperature and thermal stress of the stave hot surface. It is found that reducing the water temperature and increasing the water velocity would be uneconomical. The heat transfer and hence the maximum temperature and thermal stress in the stave can be controlled by properly adjusting operating conditions of the blast furnace, such as the gas flow, cooling channel inter-distance and diameter, lining material, coating layer and gas clearance.     

Influence of cooling medium characteristics on embedded tube fusion condition in the process of embedded tube sand mold casting

Embedded copper tube sand mold casting is the main manufacturing method of iron‐making blast furnace copper cooling stave, comparing embedded copper tube outer wall temperature with copper melting point is used to judge the fusion between liquid copper and embedded copper tube. On the basis that the computational model is reliable though experimental proof, the paper studies the influence of cooling medium characteristics on the embedded copper tube outer wall temperature. The calculated results show that the cooling medium thermal physical properties play a vital role on heat transfer between the liquid and embedded copper tube in the process of casting and determine the embedded copper tube outer wall temperature and the fusion. Through the numerical research, the cooling medium with suitable physical properties is found, adjusting the cooling media Reynolds number is an effective way to regulate the embedded tube outer wall temperature to the temperature required for fusion; in addition, modifying the cooling medium temperature entering the embedded tube is also a means adjusting the embedded tube outer wall temperature and improving the fusion between the embedded tube and liquid copper, but the method is not easy to operate in practice.     

The new technology and the partial thermotechnical computation for air-cooled blast furnace tuyere

To change the cooling method for the water-cooled blast furnace tuyere used during iron-making progress, according to the jet principle of fluid mechanics and heat convection principle, the technology of jet-flow air-cooled blast furnace tuyere was put forward. Based on the hypotheses about blast furnace, tuyere and the mix-up transparent gas medium in a hearth of blast furnace, the mathematical model of the thermotechnical process for tuyere surface was built by using the conservation law of energy. Keeping the temperature of tuyere surface constant, the cooling-air temperature heated by heat convection, the air-consumed amount and the volume percentage of cooling-air-consumed amount in the air-consumed amount for single tuyere were computed in accordance with the different initial temperature of cooling air jetting into blast furnace. The results indicate that the temperature of tuyere surface and the volume percentage of cooling-air-consumed amount in the air-consumed amount for single tuyere will be kept constant by selecting the different initial temperature and jetting velocity of cooling air jetting into blast furnace.     

高炉冷却板传热过程数学模型的研究

给出了高炉冷却板和炉衬温度分布的二维稳态传热模型，并分析了冷却板和炉衬的不同结构参数及其物性参数对温度分布和热流密度的影响，为高炉冷却系统的优化设计和控制提供了坚实的理论依据。     

Hydrogen production of bio-oil steam reforming combining heat recovery of blast furnace slag: Thermodynamic analysis

Hydrogen production via steam reforming of bio-oil combining heat recovery of blast furnace slag was investigated via thermodynamic analysis in this paper. The addition of blast furnace slag just had a slight enhancement for hydrogen production from the steam reforming process of bio-oil at low temperature, and had almost no thermodynamic effect (either promotion or restraint) for the steam reforming reaction equilibrium at high temperature where higher H₂ yield were obtained, no matter how much blast furnace slag was added. However, different masses of blast furnace slag as heat carrier supply different amounts of heat, so the optimal blast furnace slag addition was performed via energy balance. If the sensible heats of the reformed gas and the slag after steam reforming reactions were unrecycled, the required mass of blast furnace slag was over 30 times of bio-oil mass, while the required slag mass was just 11.5 times of bio-oil mass if the sensible heats after the steam reforming reactions were recycled. For the latter, about 0.144 Nm³ H₂ per kg blast furnace slag was obtained at the reforming temperature of 700–750 °C and the steam/carbon mole ratio of 6.     

国内外熔融高炉渣显热回收方法

分析了熔融高炉渣显热回收的必要性。因为熔渣的物理性质和高炉出渣不连续性,导致熔渣显热回收存在困难。介绍了滚筒法、搅拌法、风淬法、连铸法、离心粒化和反应热法显热回收工艺,并指出甲烷-二氧化碳重整法有很好的发展前途。     

高炉冲渣水余热利用探讨

高炉冲渣水余热利用对钢铁企业节能减排具有重要意义。对高炉冲渣水余热资源的特点进行了介绍,对高炉冲渣水余热利用的主要方式进行了阐述,对常用的冲渣水换热设备的选择进行了分析,并通过冲渣水余热采暖应用论证了其经济效益。     

全燃和掺燃高炉煤气炉的比较研究

由于高炉煤气中含有大量的惰性气体 ,可燃成分少 ,发热值低 ,燃料产物的体积流量大 ,因而使大容量高压燃煤气锅炉各受热面的传热特性与燃煤锅炉相比发生很大的变化。针对 5 0MW高压锅炉全燃和掺燃高炉煤气2种炉型的特点进行了详细的分析讨论 ,并与燃煤锅炉进行了比较研究 ,阐述了燃用高炉煤气锅炉的热工参数、传热特性以及受热面布置的特点 ,为研究和设计燃用高炉煤气炉提供了可靠的实践数据和理论依据。