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SA-335P22高压锅炉管缺陷分析及改进措施刘合萍1,田研1(1.湖南省衡阳市湖南衡阳钢管(集团)有限公司技术中心)摘 要:SA-335P22高压锅炉管穿孔后管体表面出现大量裂纹,其形貌特殊且分布无规律.通过对裂纹进行金相和扫描电镜分析,以及对铸坯酸洗和低倍酸浸分析,确定该穿孔裂纹是由铸坯内部裂纹引起.采取降低中间包的过热度,适当降低拉坯速度,减小铸坯的二次冷却强度等措施,对减少这种缺陷的出现有明显的效果. 关键词:高压锅炉管； 内部裂纹； 连铸圆管坯......
斩波内馈调速技术在锅炉引风机上的应用性能分析高大全1,刘英2,熊小刚1,李波2,赵朝刚2(1.四川省攀枝花市攀枝花钢钒有限公司发电厂2.攀钢集团信息工程技术有限公司)摘 要:高压电动机斩波内馈调速技术与变频调速技术同属于高效率的调速技术.斩波内馈调速技术发展应用时间不长,还远不如高压变频调速技术应用广泛,对于其应用性能还有待于进一步了解.本文针对斩波内馈调速技术在攀枝花钢钒有限公司发电厂4台710 kW锅炉引风机上的应用情况,对比高压变频调速技术性能,重点分析了斩波内馈调速系统的可靠性,节电性能,调速范围与启动......
Institute of Inner Mongolia, Huhhot 010020, China) Abstract: Using the satellite remote sensing (RS)data and ground spectrum data, the relationship of spectrum characteristics and geochemistry composition... information and realize geochemistry survey. Key words: ETM+ data; alteration anomaly; spectral characteristic; geochemistry anomaly; Zhulazhaga gold deposit; Inner Mongolia 地球化学测量在地质矿产勘查工作中发挥着重要作用,遥感......
内蒙古哈达门沟金矿床构造控矿规律及成矿预测辛向东1,刘纲2(1.内蒙古自治区包头市内蒙古包头鑫达黄金矿业有限责任公司2.中国人民武装警察部队黄金地质研究所)摘 要:哈达门沟金矿区构造格架由乌拉山复式背斜,山前大断裂,控岩断裂,控矿断裂及成矿后断裂等五大构造系统组成,矿床属山前大断裂引导产生的印支-燕山期构造-岩浆活动产物.矿脉受山前大断裂活动派生的次级构造和变质岩片理,不同岩性界面等构造薄弱面联合控制,在空间上具有南北成带,斜列和等距性分布规律,矿化则具有分段富集,向东侧伏,西高东低和上金下钼等特点.据上述成矿......
东准噶尔地区与韧-脆性剪切带有关的金(铜)成矿--构造变形转换与成矿时限及地球动力学背景张栋1,路彦明1,郭小东1,范俊杰1,潘爱军1,张玉杰1,朝银银1(1.河北省廊坊市人民武装警察部队黄金地质研究所)摘 要:东准噶尔地区位于哈萨克斯坦-准噶尔板块与西伯利亚板块缝合带南侧,是新疆北部主要的金多金属成矿带.与韧-脆性剪切带有关的金矿床是该地区最重要的金矿床类型,研究表明,韧-脆性剪切变形构造也是部分铜成矿作用的主要控矿因素.成矿同位素年代学和地球动力学研究表明,东准噶尔地区与韧-脆性剪切带有关的金(铜)成矿作用......
Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) Abstract: To study the influence of internal meridian rib and external stiffening ring on the wind-induced stable... and meridian rib setting on the wind induced stability of super large cooling tower was studied. The results show that setting stiffening ring improves the global stability of the structure by reducing wind......
Trans. Nonferrous Met. Soc. China 23(2013) 377-384 Pipe reduction of miniature inner grooved copper tubes through rotary swaging process Long-sheng LU1, Yong TANG1, Wei-qiang FANG1, Jiang CHENG2 1... for miniature inner grooved copper tube (MIGCT) heat pipes. Compared with conventional swaging method, the axial feed of the designed rotary swaging machine was reached by a constant pushing force......
Lake, Inner Mongolia Autonomous Region 粒度特征是反映碎屑沉积物和沉积岩形成水动力特征的重要指标之一,通过粒度分析可以有效地分析沉积物的形成水动力条件与沉积环境,已广泛用于区分沉积环境或微相,并且取得很大进展[1-4].随着粒度分析应用的发展,从单个样品的粒度频率曲线上很难确定沉积物总体所包含的粒度组分数,因此,应首先从沉积物序列总体中提取对沉积环境变化敏感的粒度... ODP Sci Results, 2003, 184(2): 1-21. [8] 肖尚斌, 李安春. 东海内陆架泥区沉积物的环境敏感粒度组分[J]. 沉积学报, 2005, 23(1): 122-128. XIAO Shangbin, LI Anchun. A study on environmentally sensitive gran-size population in inner......
Fengkai, LIU Fusheng, WANG Shaojie, et al. Seismic experiment and theoretical analysis on self-insulating structural walls with inner skeleton[J]. Engineering Mechanics, 2019, 36(4): 158-166, 187. [10] JGJ......
of heat transfer and long campaigns note with the core of forming accretion,the forming-accretion-ability(FAA)and the rib hot surface maximum temperature difference(ΔTmax)as quantificational indexes... the application of the two indexes, good results can be obtained.Firstly,it was suggested that the rib height of a copper stave can be reduced to 15 mm,which is a new method and theory......
