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铁水预处理喷枪用耐火浇注料的研究与发展 总被引:1,自引:0,他引:1
通过对国内外喷枪耐火浇注料研究与应用过程的综述,提出了喷枪耐火浇注料力学性能、热震稳定性能、抗渣性能、烧后线变化等方面的技术要求,指出了低膨胀系数与低弹性模量的喷枪耐火浇注料发展方向。 相似文献
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根据喷射冶金用喷枪的苛刻使用条件,进行了整体喷枪材质、结构和制作技术研究。研制成的整体喷枪为复合结构,它是由三种耐火浇注料组成的:渣线部位为AL_2O_2-CaO系浇注料,渣线以下和以上为不同理化性能的A′_2O_(?)-SiO_2-CaO系浇注料。浇注料中均用异型短钢纤维增强,钢纤维在三维空间呈无取向均匀分布。这种整体喷枪具有较好的耐侵蚀性、耐冲刷性、耐热震性和耐机械震动性,使用寿命为袖砖装配式喷枪的15倍以上。分析了喷枪使用损坏过程,认为枪体耐火材料的蚀损是受高温化学反应所控制,因此提高枪体渣线部位浇注料中的AL_2O_3含量,降低杂质氧化物含量,和阻止高Mg渣进入喷吹盛钢桶内,以减少枪体工作面生成黄长石、钙长石等低熔物,可提高喷枪使用寿命。 相似文献
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TN钢包喷粉用整体喷枪的研制与应用 总被引:1,自引:1,他引:0
为满足一炼钢厂从西德麦索公司引进的TN钢包喷粉冶金工艺和设备对整体喷枪的需要,试验组对整体喷枪浇注料的材质,成型工艺及使用进行了试验研究。 相似文献
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以某厂300tRH真空精炼装置为研究原型,建立1∶6.5的水力模型对RH喷吹精炼工艺进行物理模拟。研究了喷吹位置、喷吹气量及驱动气体流量对循环流量和均混时间的影响。结果表明:不同喷吹气量、驱动气体流量条件下,获得大循环流量和短均混时间的最优喷吹位置不同。较小的喷吹气量(2.98~3.53m3/h)或者较小的驱动气体流量(0.93~1.02m3/h)时,宜采用低顶枪枪位(153.8mm)喷吹;喷吹气量大于3.91m3/h或者驱动气体流量大于1.12m3/h时,宜采用真空槽底部喷吹角度120°的侧喷嘴喷吹。顶枪与侧喷嘴复合喷吹有利于提高RH喷吹工艺的适应性及循环效率。 相似文献
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针对气化室喷枪纯喷颗粒镁铁水脱硫普遍存在的问题,从脱硫工艺、喷枪结构、扒渣工艺、气化室粘渣清理维护与喷枪长寿命5个方面,介绍武钢的技术进步与实际应用效果。 相似文献
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《钢铁冶炼》2013,40(8):599-606
AbstractThe transport phenomena in injection lance and the penetrability of solid particles into liquid metal at the lance tip during injection treatment was analysed by a one-dimensional mathematical model developed in this work. Mechanic interactions and heat transfers between a solid particle, carrier gas, lance and/or hot metal have been incorporated in the model. Temperatures and velocities of carrier gas and solid particles were examined for a typical hot metal desulphurisation process by granulated magnesium injection. The temperature of gas increases by several hundred degrees, while that of solid magnesium particles only by several degrees in the lance. The gas velocity is increased by thermal expansion in lance. At the lance tip, the magnesium particle velocity is slower than the gas velocity. The penetrability of a magnesium particle into the hot metal at the lance tip was analysed. 相似文献
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A water model of top and bottom blown converter with top lance powder injection and bottom tuyere powder injection was established to investigate the powder injection. The results show that the powder penetration ratio under the condition of top lance injection is greater than that under the condition of bottom tuyere powder injection. In both cases, the powder penetration ratio increases with the increase of solid/gas ratio and powder particle size. Powder uniform dispersion time with top lance powder injection is longer than that with bottom tuyere powder injection. Top lance powder injection, lance height of 258?mm, bottom blowing rate of 1·96?Nm3?h?1 and powder particle size of 0·212–0·380?mm are suggested as the optimum powder injection operation under the experimental condition. The corresponding optimum operation for prototype is top lance powder injection with lance height of 1550?mm, powder size of 1–5?mm and bottom blowing rate of 450?Nm3?h?1. 相似文献
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Satish C. Koria 《国际钢铁研究》1989,60(2):60-66
Submerged gas injecting bottom lance design parameters are modelled by applying the theory of compressible flow of gas under irreversible-adiabatic conditions. Using the criterion of onsetting the jetting mode of injection of gas into liquid the lance design paramters such as upstream stagnation pressure and Mach number, length of the lance for a given diameter and material, gas injection rate etc. are determined. Nomograms are presented to determine the above mentioned lance design parameters. The derived parameters are discussed in relation to submerged gas injection practice. 相似文献