摘要
炼铁过程中,烧结矿的冷却及余热回收工艺主要依靠环冷机实现。烧结矿初入环冷机时温度可达520℃,经环冷机回转1周冷却后,温度降低至120℃以下。明显的温度梯度导致环冷机的不均匀热变形,严重时会引起运行失稳、卡轨等问题。因此,对常见的底卸式环冷机作业过程中的温度场及热机耦合变形的分析具有重要的工程意义。首先采用流场分析软件,对环冷机内烧结矿的冷却过程进行分析,将烧结矿温度场施加于环冷机有限元模型中,计算环冷机整体结构的温度场和热机耦合变形。为了验证有限元分析结果,对现场运行的环冷机表面温度场进行了实时测量,测量结果表明有限元的温度场分析结果较为准确。数值仿真结果表明,底卸式环冷机的整体温度较高,隔温效果差。由于鼓风冷却作用,温度自上至下呈递减趋势,同一高度上的局部区域内温度变化不大。环冷机热机耦合变形明显,最大变形发生于高温区的内圈侧轨处,总位移达到91 mm,水平位移达22 mm。底卸式环冷机的工作温度高,热变形明显,需要进行进一步的优化改进,实施更新换代。
In the process of ironmaking, the sinter cooling and waste heat recovery depends on the ring cooler. The initial temperature of sinter is 520 ℃. After one round cooling by the ring cooler, the temperature decreases to below 120 ℃. The uneven thermal deformation generated by the obvious temperature gradient of ring cooler will result in a series of problems such as unstable operation and rail stuck. It is of great practical significance to analyze the temperature field and thermal-mechanical coupling deformation of traditional bottom-unloading ring cooler in the operation. Based on the flow field analysis software, the cooling process of sinter in the ring cooler was simulated. The temperature field of sinter was applied to the finite element model of ring cooler and the temperature field and thermo-mechanical coupling deformation of the overall ring cooler were analyzed. In order to verify the numerical simulation results, the surface temperature field of ring cooler in field operation was measured in real time. The measurement results validate the finite elemental simulations of temperature fields. The numerical simulation results show that the overall temperature of traditional bottom-unloading ring cooler is high in the operation process and the temperature isolation effect is poor. Due to blower cooling function, the temperature field shows a decreasing trend from top to bottom and insignificant variation of temperature at the same height in local area. The ring cooler deforms with large thermal-mechanical coupling deformation, where the largest resultant deformation of 91 mm and horizontal displacement of 22 mm occur at the inner ring side rail in the high temperature region. The traditional bottom-unloading ring cooler has high working temperature and obvious thermal deformation. It needs further optimization and improvement.
作者
靳洪涛
刘隆建
JIN Hong-tao;LIU Long-jian(Ironmaking Plant Equipment Department,Meishan Iron and Steel Co.,Ltd.,Nanjing 210039,Jiangsu,China;School of Science,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)
出处
《中国冶金》
CAS
北大核心
2022年第10期136-142,共7页
China Metallurgy
关键词
有限元法
环冷机
温度场
侧轨道位移
侧挡辊
热机耦合变形
finite element method
ring cooler
temperature field
side track displacement
side gear roller
thermo-mechanical coupling deformation
