合钢转炉溅渣护炉工艺与实践

转炉溅渣护炉技术是转炉护炉技术的重大进步。阐述了合钢第二炼钢厂转炉溅渣护炉工程的工艺技术特点及操作实践,并对溅渣护炉操作中出现的问题及经济效益进行了分析。     

100t转炉溅渣护炉工艺研究

为某厂100t顶吹转炉溅渣护炉提供最佳工艺参数,按照转炉相应比例设计水力模型并试验研究。根据试验结果,优化溅渣护炉工艺参数,相应调整溅渣氮气压力和枪位,提高了溅渣效果,溅渣后炉渣均匀涂覆到炉衬上,溅渣时间缩短到2．5～3min,进一步提高了转炉炉龄,实现24025炉的新记录。     

八钢溅渣护炉工艺的实践应用

介绍了溅渣护炉工艺在炼钢厂转炉车间实施过程的情况,讨论了溅渣护炉工艺在八钢实践应用初步的规律性认识,同时进行了经济效益分析,提出了目前存在的问题及对策。     

关于转炉溅渣护炉的几个工艺问题

分析总结了国内转炉溅渣护炉的生产经验,提出:①溅渣护炉的合理渣量为:Qs=0 301Wn(n=0 583～0 650);②适宜溅渣的合理终渣成分为:R=2 8～3 5,(TFe)=10%～15%,MgO>8%;③转炉出钢温度对炉龄的影响为:n=208529～120 9t     

复吹转炉溅渣护炉水模试验研究

通过水力学模型试验,研究了影响复吹转炉溅渣护炉效果的因素,研究认为,为了取得良好的溅渣护炉效果,顶、底吹流量及顶枪枪位应有一良好的配合.马钢50t复吹转炉的最优化工艺参数为:顶枪气体流量12000Nm3/h,枪位2000mm,留渣量9%,底吹气体流量60～120Nm3/h.     

复吹转炉溅渣护炉水模试验研究

通过水力学模型试验,研究了影响复吹转炉溅渣护炉效果的因素,研究认为,为了取得良好的溅渣护炉效果,顶、底吹流量及顶枪枪位应有一良好的配合。马钢５０ｔ复吹转炉的最优化工艺参数为：顶枪气体流量１２０００Ｎｍ＾３／ｈ,枪位２０００ｍｍ,留渣量９％,底吹气体流量６０～１２０Ｎｍ＾３／ｈ。     

国外溅渣护炉技术简介

介绍阵外溅渣护炉技术的发展近况，护炉方法，物理模型研究和设备安装等情况。     

转炉溅渣护炉炉渣物性研究

针对转炉后吹和正常吹炼终渣FeO变化较大的特点 ,对炉渣的成分、熔化性温度和岩相结构进行研究 .研究结果为转炉溅渣护炉终渣成分的调整提供了一些依据     

转炉溅渣护炉渣物性研究

针对转炉后吹和正常吹炼终渣FeO变化较大的特点,对炉渣的成分、熔化性温度和岩相结构进行研究,研究结果为转炉溅渣护炉终渣成分的调整提供了一些依据。     

AOD炉溅渣护炉氮气流量模糊自适应PID控制

针对AOD炉溅渣护炉氮气流量控制系统中氮气流量复杂变化、非线性、时变性等问题,研究了模糊规律并应用于PID控制器。MATLAB仿真结果表明,系统具有良好的动态、静态性能。     

转炉炉渣喷溅的机理及预防措施

转炉炉渣喷溅会带来种种危害,严重威胁炼钢安全,恶化多项技术经济指标。探讨了转炉炉渣喷溅的机理,分析了易发生炉渣喷溅的几种情况,在上述研究的基础上,提出了防止炉渣喷溅的种种措施。     

Simulation on Slag Splashing for LD Converter

SeveraL parameters affecting slag splashing in LD converter have been discussed. Using parffin and starch model, a simulated test about 30 t converter has been made in laboratory and the modified Frode numberwas chosen as the main similar basis of the system. It was results that the optimized slag splashing parameters wasobtained through data treatment The nitrogen gas flow rate is about 8 500 m3/h, the splashing time is of 3 min,and the lance height is of 0.8 m. It is necessary to add MgO or carbon into the slag to adjusting slag composition.Also, it is difficult for the splashed slag condensing on the line when the slag temperature is much higher     

鞍钢三炼钢厂低硫钢冶炼过程回硫分析

通过对低硫钢试验过程进行分析,研究了影响转炉冶炼过程回硫的各种因素,确定非低硫钢溅渣是转炉回硫的主要因素之一,并提出采用连续冶炼低硫钢可以减少回硫的操作工艺。     

含B2O3的Al2O3-Fe2O3基无氟复合造渣剂的试验研究

研究含B2O3的Al2O3-Fe2O3基无氟复合造渣剂快速造渣及其机理。在杭钢炼钢厂40 t转炉上进行含B2O3的Al2O3-Fe2O3基无氟复合造渣剂的工业性试验。试验表明该造渣剂冶金特性良好,能提前0.5～1.0 min化渣;全程化渣好,基本上不喷溅,不返干;钢铁料、石灰等的消耗有所降低。这些结果表明在转炉冶炼前期,提高炉渣（Al2O3）和（B2O3）含量有利于快速化渣。     

Study on the optimization of the combined blown converter process in Chongqing Iron and Steel Company

The effects of lance height and bottom blown flowrate on the mixed time, the splashing amount, the penetrating depth, and the level fluctuation of an 85 t combined blown converter have been studied using a water model. The results show that the maximal stirring energy is provided to the bath at the top lance height of about 50-100 mm. When the top lance height is in the range ofg0- 110 mm, the splashing amount caused by the top jet can reach the maximal value. The appropriate operational parameters of Chongqing Iron and Steel Company （CISC） converter have been established that the top lance height is 1600-1760 mm and the bottom blowing flowrate is 240-480 Nm^3/h in the primary phase of a heat, 1100-1300 mm and 160-200 Nm^3/h in the second phase, and 1040-1120 mm and 200-350 Nm^3/h in the end phase. Also, the trial shows that the metallurgical result of the studied blow pattern is better than that of the former pattern. At the starting 3-4 min of a heat, the strong splashing is eliminated. 2008 University of Science and Technology Beijing. All rights reserved.     

Effect of Spray Parameters on the Splashing of Plasma-sprayed Cast Iron Particles

To understand the effects of spray parameters on the splashing,cast iron particles were plasma-sprayed onto polished surfaces of aluminum substrate to form single splats.Various plasma arc powers and spray distances were applied to adjust the morphology of the splats which was studied using a field emission scanning electron microscope(FESEM).The experimentalresults showed that the splashing of impinging droplets was significantly restrained for the splats deposited with high arc power(30 k W)and short spray distance(80 mm).This finding would be beneficialto improving the adhesive strength of the coating.     

Numerical simulation of ice accretion in supercooled large droplet conditions

The simulated methods for ice accretion on two-dimensional airfoil surface are established completely under the Eulerian framework in supercooled large droplet(SLD) conditions. The two-dimensional code to solve the partial differential equations(PDEs) of droplet phase is derived to simulate the impingement characteristic of SLD. Also, several semi-empirical models which explain the droplet-wall interaction are compared and discussed to show respective features when simulating the splashing phenomenon. In particular, a new boundary condition for wall called penetrable wall for splashing droplet(PWSD) is proposed to deal with the impingement of SLD on solid surface, which efficiently improves the accuracy of simulation. Then the improved impingement characteristic of SLD is input into the extended mass and heat transfer model to simulate the ice growth on airfoil surface. The multistep advanced method is carried out to better match the physical phenomenon of ice growth. At last, the simulated results of critical parameters: local droplet collection efficiency and the height of ice growth are compared with the experimental data which verify the applicability of proposed models.