连铸中间包不断流更换定径水口技术的应用

广钢集团电炉炼钢厂（以下简称电炉厂）采用连铸中间包定径水口不断流快速更换技术，可在0．1s内将定径水口更换完毕。更换后上、下水口的中心线误差小于0．1mm，避免了水口烧坏、浸蚀过大造成的拉速过快及漏钢事故，稳定了拉速，连铸坯合格率由98．22％提高到99．81％。     

除尘系统双流量喷嘴的性能试验研究

通过试验研究了除尘系统双流量喷嘴，在喷嘴不同结构参数下气压和水流量变化的特性，分析了喷嘴结构参数、气压、水流量对水压、气耗率、雾化角、颗粒度以及水滴喷出速度的影响规律，优化后的喷嘴有效地改善了烟气冷却不充分的状况。为喷嘴雾化冷却性能的分析研究和优化设计提供了技术途径。     

连铸中间包水口堵塞问题浅析

研究了浸入式水口堵塞的形成机理。堵塞沉积主要是由于氧化物颗粒附着到浸入式水口耐火材料的内表面，继而烧结在一起所致。小沉积颗粒的烧结形成不规则的网状物。耐火材料和钢水问反应层的形成，尤其是当耐火材料中含二氧化硅可还原组分，则加速沉积。另外，采取改善水口材质、改善和维护水口形状、提高钢水清洁度、对钢水夹杂物进行变性处理等措施，可有效防止水口堵塞。     

氧化锆水口在使用中的损毁机理初探

通过对用后氧化锆水口砖的显微结构及矿相分析,认为氧化锆水口砖的损毁主要是由于钢水和渣的侵蚀造成氧化锆中的稳定剂脱溶失稳分解产生的,同时由于热应力产生的微裂纹导致钢水的进一步渗透,加快了水口的侵蚀速度.     

Influence of submerged entry nozzle clogging on the behavior of molten steel in continuously cast slab molds

The influence of submerged entry nozzle clogging on the behavior of molten steel in continuously cast slab molds was studied using commercial code CFX4.3. The results indicate that clogging at the top part of the nozzle port not only increases the velocity of molten steel, but also enhances the wall shear stress, F number and heat flux. This clogging has the greatest effect on the behavior of molten steel. However, clogging at the top 1/3 of the nozzle only increases the velocity of molten steel and has little influence. Clogging at the bottom of the nozzle almost has no influence.     

金隆闪速炉精矿喷嘴的优化

介绍金隆公司闪速炉精矿喷嘴的结构特点和运行情况,针对运行中存在的问题,通过优化操作参数、改进结构,喷嘴的性能得到了很大改善。     

Cold Modelling of Slag Splashing in LD Furnace by Oxygen Lance with Twisted Nozzle Tip

The effects of a conventional lance tip with 4 normal nozzles and a lance tip with 4 twisted nozzles on slag splashing were investigated. A cold model for LD converters, Jiuquan Iron & Steel Co., was established and the amount of slag splashed onto the model walls was measured in the cold modelling experiments. The results from the experiments show that at low top gas flow rate the amount of slag splashing for the tip with twisted nozzles is less than that for the conventional tip, whereas at high top gas flow rate the amount of slag splashing for the nozzle twisted lance is greater than that for the conventional lance. For the nozzle twisted lance tip, slag splashing rates increase with increase in slag amount, lance height and top gas flow rate and the maximum amount of slag splashing for the tip with twisted nozzles can be obtained under the process parameters of 47.6 Nm³/h gas flow rate, 12% slag amount and 247 mm lance height. More slag droplets can be directed onto the cone with a nozzle twisted lance tip than with a normal lance tip at high top gas flow rate.     

采用音速喷嘴的气体流量标准装置

建设流量标准装置是进行计量检定的基础工作，本文对当前的气体流量标准装置进行了分析比较，介绍采用音速喷嘴建设气体流量标准装置的理由和应用中的一些问题。     

内伸式接管补强结构应力分布特点

针对圆柱形压力容器内伸式接管补强结构，以DXF格式件为中介，用数学计算自动生成有限元计算模型的方法，进行了三维线弹性有限元应力分析，得到了内压圆柱壳内伸式接管补强结构的应力分布规律。结果表明，接管与简体相贯线最低处简体的内、外壁上的两点是内伸式接管补强结构的危险点，内伸长度的大小不影响内伸式接管补强结构的应力分布规律。分析结果为进行内伸式接管补强结构的设计提供了依据。     

空气对汽轮机组油系统的影响及其改进措施

针对危急遮断器滑阀自动挂闸的故障，进行了试验和理论计算，查明发生故障的主要原因为油系统中滞留空气所致，并提出了改进措施：增大压缩线管径，取消截止阀和节流孔板，采用DN32止回阀；支管与母管采用斜切口连接方式，减少压缩线阻力损失，增大流量。改进后，消除了故障，有效地防止了机组全速冲转和超速事故的发生。