应用多因素耦合数值计算210 t钢包热状态分级

Thermal state classification of 210 t ladle using multifactor couplingnumerical calculation

摘要:

为精确管控周转钢包造成的钢水温降，以降低转炉出钢温度并减少能耗，使用有限元软件Ansys14和ParaMesh2.3网格随移技术建立钢包的传热计算模型，分析新包烘烤时间、空包时间、在线烘烤、离线烘烤时间和包衬侵蚀对钢包热状态及钢水温降的耦合影响；使用红外法实测温度，对比验证了模型的准确性. 根据计算的钢水温度补偿值，建立包含包况信息编码的钢包热状态分级表. 结果表明：受烘烤时间影响，第一包龄钢水温降变化范围是32.0~39.6 K；空包3 h无在线烘烤情况下，钢水温降约为47 K；有在线烘烤的情况下,前10 min的在线烘烤能够使钢水温降减少3.1~6.2 K；钢包侵蚀对包衬温度影响较大，但对钢水温降影响不大，最高不超过1 K. 分级表应用于现场，为转炉出钢温度的设定和配包提供了依据，使M钢厂主要钢种出钢温度降低2.3~13.2 K.

Abstract:

To accurately control molten steel temperature drop caused by turnover ladle and reduce tapping temperature and energy consumption, the heat transfer computation model for ladle was built by using the software Ansys14 and adaptive mesh refinement of ParaMesh2.3. The influence of preheating time before ladle going online, cooling time, online preheating time, offline preheating time and erosion of ladle lining on the thermal storage of ladle and molten steel temperature drop was analyzed. The infrared measured data was used to verify the veracity of the model. The ladle classification table including ladle condition information coding has been built, which was based on calculated molten steel temperature compensation. The research result showed that the molten steel temperature drop varies from 32.0 K to 39.6 K influenced by the preheating time when ladle in the first thermal circulation. The molten steel temperature drop was 47 K when the cooling time was 3 hours with no online preheating. Molten steel temperature drop could be decreased by 3.1 K~6.2 K through the first online preheating for 10 min. The erosion of ladle lining had a big influence on the temperature field of ladle lining but not on the temperature drop of molten steel, and the molten steel temperature drop could not be more than 1K. The ladle classification table can be used to the tapping temperature setting and ladle selecting. The main steel grades tapping temperature in the M steel plant was decreased by 2.3~13.2 K.