共查询到18条相似文献,搜索用时 203 毫秒
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为了考察复吹转炉底吹氧气和石灰粉过程中的熔池特性,建立复吹转炉底吹喷石灰粉的水模型,用水模拟铁水,用空心玻璃微珠模拟石灰粉。利用图像处理法研究了底吹氧气和石灰粉时粉剂分布情况及熔池搅拌情况。采用熔池电导率法考察了相同条件下底吹喷粉与不喷粉时的混匀时间。研究结果表明,喷粉能够促进熔池搅拌,且粉剂扩散速度随底吹载气流量增大而增大;未喷粉时,混匀时间随载气流量增大而减小;在相同底吹载气流量条件下,喷粉时熔池的混匀时间明显低于未喷粉时的混匀时间,且在试验范围内,混匀时间在底吹载气流量为2 m3/h(标准态)时出现极小值。 相似文献
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由于圆孔取代矩形狭缝后,可以有效地缓解透气塞狭缝孔周应力集中和延长其使用寿命,因而研究其精炼过程显得十分必要。文中采用离散相模型与VOF模型对钢包吹氩过程进行了研究,对比分析了不同流量下使用圆孔狭缝式透气塞的钢包内的流场和渣眼面积,并采用水模试验方法验证了数值模拟。结果表明:底吹气体流量对钢包的流场特征影响不大,当流量高于3.76 L/min时,流量的增大对钢液的流速影响不大,当底吹流量低于3.76 L/min时,流量增大,钢液流速增大;而且水模试验中的渣眼面积与数值模拟得到的渣眼面积吻合较好。 相似文献
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《钢铁研究学报》2018,(11)
以西宁特钢30 t VOD冶炼不锈钢为工艺背景,采用数值模拟与物理模拟相结合的研究方法,研究了顶底复吹条件下30 t VOD钢包精炼过程中钢液流动及混匀特性。水模拟实验分析了钢包在底吹及复吹条件下的钢液混匀特性,数值模拟分析了不同复吹条件下钢液的流场特征。研究结果表明:当钢包底吹位置为1/4R(R为钢包底部半径)时,钢液既有最佳的复吹混匀效果,又有较好底吹混匀效果,其混匀时间相比中心位置分别降低46%、14%;钢液流场及湍流动能分析结果表明,当底吹位置1/4R时,在熔池液面区,顶吹与底吹二者作用于钢液形成流动的方向吻合程度较好,且熔池内部钢液活跃体积比高于其他吹气位置,其横截面活跃面积可达47%,结合实际冶炼效果对比,钢包底吹位置1/4R处为VOD钢包的最佳吹气位置。 相似文献
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不同透气砖钢包底吹特性的水模研究 总被引:3,自引:0,他引:3
为满足ANS-OB钢包底吹工艺的需要,对3种不同透气砖底吹气体的行为进行了水模研究,结果表明:弥散型和直通多微孔型透气砖底吹均产生细小气泡结构,狭缝式透气式砖则为大气泡结构:在排渣能力和钢渣液面的冲击力,前两种效果接近,后一种则有所不同,因此,生产中应根据钢水处理的需要选用相应的底吹透气砖。 相似文献
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转炉底喷粉剂输送特性 总被引:1,自引:0,他引:1
通过冷态和热态试验,研究转炉底喷粉剂的输送特性,初步认为:喷粉压力应大于0.5MPa;冶炼过程中不停喷,可通过调整罐压和载气量控制喷粉过程;粉气出口速度应大于300m/s,提高气流速度,有利于减少喷粉过程的脉动。 相似文献
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钢包底吹透气率做为我厂的一项重要技术经济指标,高底吹透气率是许多钢铁企业追求的目标,直接制约到钢水质量、铸坯质量的稳定提高。鉴于目前现状,我们提出了"提高钢包底吹透气率的工艺改进研究与应用",针对现存底吹透气砖断裂、透气砖罅缝夹钢堵塞、管路被损坏等问题,提出一系列改进方案,如:合理选择透气砖材质,降低罅缝夹钢堵塞;改进透气砖装配尺寸,降低断裂几率;加强底吹管路的维护和管理;良好的底吹效果对品种钢尤其是低碳低磷低硫钢种的生产提供了有力保障。 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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Manabu Iguchi Tsuneo Kondoh Keiji Nakajima 《Metallurgical and Materials Transactions B》1997,28(4):605-612
The establishment time of gas-liquid two-phase flows in a cylindrical bath agitated by bottom gas injection through a central
single-hole bottom nozzle was investigated. Because the turbulence intensity in the bath was comparable to or larger than
the unity, the conventional definition of the flow establishment time based on the history of mean velocity was not suitable
for the present case. In fact, it was difficult to determine the flow establishment time based on the well-known 90 or 99
pct criterion for the mean velocity. Accordingly, two methods of determining the flow establishment time by focusing on the
turbulence components instead of the mean velocity components were proposed. Velocity measurements were made with a two-channel
laser Doppler velocimeter. The flow establishment time was correlated as a function of gas flow rate. Close agreement was
obtained by the two methods. 相似文献
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