钢水连续测温传感器Al2O3-C管烧制过程温度研究

doi:10.3969/j.issn.1001-1935.2021.04.003

耐火材料 ›› 2021, Vol. 55 ›› Issue (4): 287-290.DOI: 10.3969/j.issn.1001-1935.2021.04.003

钢水连续测温传感器Al₂O₃-C管烧制过程温度研究

肖步庆¹⁾(), 孟红记²⁾(), 李太全¹⁾, 王峰²⁾

1)邯钢集团公司第一炼钢厂河北邯郸 056015
2)东北大学信息科学与工程学院辽宁沈阳 110819

收稿日期:2021-01-18 出版日期:2021-08-15 发布日期:2021-08-22
通讯作者: 孟红记,女,1970年生,博士,副教授。E-mail: menghognji@ise.neu.edu.cn
作者简介:肖步庆:男,1972年生,高级工程师。E-mail: xiaobuqing@hbisco.com
基金资助:
国家重点研发计划资助项目(2017YFB0304105);国家重点自然科学基金资助项目(51634002)

Sintering temperature of Al₂O₃-C tubes for continuous temperature sensor of molten steel

Xiao Buqing¹⁾(), Meng Hongji²⁾(), Li Taiquan¹⁾, Wang Feng²⁾

1)Steelmaking Plant of Hansteel Group,Handan 056015,Hebei,China

Received:2021-01-18 Online:2021-08-15 Published:2021-08-22
Contact: Meng Hongji

摘要/Abstract

摘要：

为了提高钢水连续测温传感器Al₂O₃-C管的烧制质量,首先对烧制过程中炉内温度场进行测量,分析炉内温度场的变化规律;然后建立烧制过程中Al₂O₃-C管头部的热应力模型,根据热应力云图和最大热应力位置的应力、温度、应变曲线,确定最易发生损坏的位置,并分析其发生损坏的原因;最后根据分析得到的损坏发生的原因改进烧制过程的温度制度,并用于实际生产。研究表明:炉内的实际温度与设定温度不一致,上部温度高于下部的,排气口下方的温度高于其他位置的;根据应力模型确定的3个应力最大位置与实际烧制过程中的损坏位置一致;将300~600 ℃的升温速率由3.3 ℃·min^-1降低至2 ℃·min^-1后,烧制损坏率由改进前的千分之八减小到万分之一。

关键词: 温度场测量, Al₂O₃-C管, 烧制过程, 热应力

Abstract:

To improve the sintering quality of Al₂O₃-C tubes for continuous temperature sensors of molten steel,firstly,the temperatures in different positions in the furnace during sintering were measured,and the variations of the temperature field were analyzed;then,the thermal stress model of the Al₂O₃-C tube head during sintering was established;according to the calculated thermal stress nephogram and the stress,the temperature,the strain curve corresponding to the maximum thermal stress position,the most vulnerably damaged positions were determined and the damage reasons were analyzed;finally,the firing schedule was optimized based on the analysis of the damage reasons and then applied in on site production.The results show that: the actual furnace temperatures in not consistent with the set temperatures;the upper temperatures are higher than the lower temperatures,and the temperatures below the exhaust ports are higher than those at other parts;the three maximum stress positions predicted by the stress model are consistent with the damage positions in the actual sintering;the heating rate in the range of 300-600 ℃ is reduced from 3.3 ℃·min^-1 to 2 ℃·min^-1,which decreases the failure rate from 8/1 000 to 1/10 000.

Key words: determination of temperature field, alumina-carbon tube, sintering process, thermal stress

中图分类号:

TQ175.6

肖步庆, 孟红记, 李太全, 王峰. 钢水连续测温传感器Al₂O₃-C管烧制过程温度研究[J]. 耐火材料, 2021, 55(4): 287-290.

Xiao Buqing, Meng Hongji, Li Taiquan, Wang Feng. Sintering temperature of Al₂O₃-C tubes for continuous temperature sensor of molten steel[J]. Refractories, 2021, 55(4): 287-290.

图/表 9

图1 测温热电偶的径向和周向安装位置示意图

Fig.1 Diagram of radial and circle installation points of thermocouples

表1 测量点到炉顶的距离及测温方案

Table 1 Distances from measurement point to furnace roof and measurement plans mm

方案	A_上	A_中	A_下	B_上	B_中	B_下	C_上	C_下
方案一			1 100	360		1 060	320	800
方案二	250	620	1 200	250	500	1 200

表2 Al2O3-C管在不同温度下的比热容、热传导率和热膨胀系数

Table 2 Specific heat capacity,thermal conductivity and thermal expansion coefficient of Al2O3-C tube at different temperatures

温度/℃	比热容/ (kJ·kg^-1·K^-1)	热导率/ (W·m^-1·K^-1)	热膨胀系数× 10⁶/K^-1
0	0.762	50.225	6.538
100	0.956	41.295	7.550
200	1.087	34.383	8.185
300	1.182	28.452	8.762
400	1.251	23.547	8.917
500	1.310	20.557	9.280
600	1.354	18.846	9.521
700	1.396	18.208	9.764
800	1.420	17.061	10.084
900	1.442	15.578	10.191
1 000	1.451	14.861	10.297

图2 试样的热态弹性模量随温度变化的曲线

Fig.2 Curve of hot elastic modulus vs temperature

图3 不同测温方案中各测温点的温度-时间曲线

Fig.3 Curves of temperature vs time at different points for different measurement plans

图4 方式一中纵剖面在463 min时的应力云图及应力最大处的应力、温度、应变曲线

Fig.4 Stress nephogram of longitudinal section at 463 min and stress,temperature,strain curves at the maximum stress in mode 1

图5 方式一中纵剖面在1 203 min时的应力云图及顶部应力最大处的应力、温度、应变曲线

Fig.5 Stress nephogram of longitudinal section at 1 203 min and stress,temperature,strain curves at the maximum stress at top in mode 1

图6 方式二中纵剖面在455 min时的应力云图及应力最大处的应力、温度、应变曲线

Fig.6 Stress nephogram of longitudinal section at 455 min and stress,temperature,strain curves at the maximum stress in mode 2

图7 模型计算得出的易损坏位置

Fig.7 Easily damaged positions calculated by model

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钢水连续测温传感器Al₂O₃-C管烧制过程温度研究

Sintering temperature of Al₂O₃-C tubes for continuous temperature sensor of molten steel

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