高温铁液底吹O2-石灰粉火点区流场-温度场热耦合与形貌演变机制研究
Study on Thermal Coupling and Morphological Evolution Mechanism of Flow Field-Temperature Field in the Ignition Zone of Bottom-Blown O?-Lime Powder Process for High-Temperature Molten Iron
董凯 1王子瑜1
作者信息
- 1. 北京科技大学碳中和研究院，北京 100083
- 折叠
摘要
针对转炉底吹O2-CO2-石灰粉工艺中火点区的多场耦合特性，建立了气-固-液三相热耦合数值模型，系统研究了O2/CO2比例、底吹流量及石灰粉喷吹速率对火点区形貌与温度场的影响规律。结果表明，O2/CO2比例从30/70增至70/30时，火点区纵向长度由114.2mm增至133.8mm，长径比由1.24增至1.58，呈现细长形演变趋势。底吹流量从1285Nm3/h增至1338Nm3/h，温度峰值由1971.9K升至2050.7K，温度标准差由31.8K降至28.2K，流场-温度场耦合系数由0.0197增至0.0277mos-1▪K-1。火点区与炉底耐材存在显著热响应关系，耐材表面温度与火点区平均温度的相关系数达0.968。优化工况参数为O2/CO2=70/30、底吹流量1338Nm3/h、石灰粉喷吹速率2.03kg/s，此时火点区平均温度1980.6K，脱磷效率75.3%，实现了高效冶炼与设备长寿的协同。
Abstract
To investigate the multi-field coupling characteristics in the flame zone of the bottom-blown O2-CO2-lime powder process in converters, a three-phase gas-solid-liquid thermally coupled numerical model was established. The effects of O2/CO2 ratio, bottom-blown flow rate, and lime powder injection rate on the morphology and temperature field of the flame zone were systematically studied. Results indicate that when the O2/CO2 ratio increases from 30/70 to 70/30, the longitudinal length of the hot spot zone extends from 114.2 mm to 133.8 mm, with the aspect ratio increasing from 1.24 to 1.58, exhibiting a slender evolution trend. As the bottom-blown gas flow rate increased from 1285 Nm3/h to 1338 Nm3/h, the peak temperature rose from 1971.9 K to 2050.7 K, the temperature standard deviation decreased from 31.8 K to 28.2 K, and the flow-temperature Study on Thermal Coupling and Morphological Evolution Mechanism of Flow Field-Temperature Field in the Ignition Zone of Bottom-Blown O2-Lime Powder Process for High-Temperature Molten Ironcoupling coefficient increased from 0.0197 to 0.0277 mos-1▪K-1. A significant thermal response relationship exists between the hot spot zone and the refractory lining at the furnace bottom, with a correlation coefficient of 0.968 between the refractory surface temperature and the average temperature of the hot spot zone. The optimized operating parameters were O2/CO2 = 70/30, bottom-blowing flow rate of 1338 Nm3/h, and lime powder injection rate of 2.03 kg/s. Under these conditions, the average temperature in the hot spot zone reached 1980.6 K, achieving a phosphorus removal efficiency of 75.3%, thereby synergistically realizing both efficient smelting and extended equipment lifespan.关键词
转炉底吹/O2-CO2-石灰粉/火点区/流场-温度场耦合/形貌演变/数值模拟Key words
converter bottom blowing/O?-CO?-lime powder/hot spot zone/flow-temperature coupling/morphology evolution/numerical simulation引用本文复制引用
董凯,王子瑜.高温铁液底吹O2-石灰粉火点区流场-温度场热耦合与形貌演变机制研究[EB/OL].(2026-04-14)[2026-04-15].http://www.paper.edu.cn/releasepaper/content/202604-121.学科分类
炼钢
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