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高炉炉身下部及炉缸,炉底冷却系统的传热学计算 杨天钧1,杨为国2,孙磊1,程树森1,左海滨1,潘奉贤3 (1.北京科技大学冶金学院,北京,100083;2.北京钢铁设计研究总院炼铁室,北京,100053;3.韩国顺天国立大学工科学院,顺天) 摘要:在高炉冷却器及炉缸,炉底热面凝结一层渣铁壳有利于防止炉衬侵蚀,延长高炉寿命.为了达到这一目的,需要设计无过热的铸铁冷却壁,铜冷却壁和板-壁结合冷却器以及无过热的炉缸和炉底.为此建立了高炉炉身下部冷却器及炉缸,炉底温度场的数学模型,应用C++语言在VC++集成环境下开发了高炉炉身下部冷却器及炉缸,炉底温度场计算软件.计算结果表明,通过优化炉身下部......
有芯工频熔铜炉筑炉启炉工艺张御天,李新喜摘 要:正确的筑炉方法是保证有芯工频感应熔铜炉开炉成功的基本前提.选用合理的捣打料,进行正确的粒度配合,并添加一定比例的红柱石,碳化硅是提高熔铜炉的烧结强度的有效措施.采用分层递降厚度的加料方式,打结层表面拉毛并取出细粉,有利于料层之间的粘接.采用中心环形辐射式向外逐圈打结的方法,二级密实的捣打工艺,并进行三段式烘炉启炉,有利于启炉成功和延长炉龄.关键词:有芯工频感应炉;铜熔化炉:筑炉;石英砂;烧结;烘炉;......
-like/flake Ag3Sn+β-Sn becomes fine equiaxed crystal; coarse compound phases exist when the content of Ce is up to 0.1%, which is harmful to microstructures of solder alloy and soldering seam. With regard to soldered joints, microstructures formation of the interface between Sn-Ag-Cu-Ce solder and Cu substrate (soldering seam) is different from that of Sn-Ag-Cu-Ce alloy itself, as a result......
">The effects of different Bi contents on the properties of Sn solders were studied. The interfacial reaction and growth behavior of intermetallic compounds(IMCs) layer(η-Cu6 Sn5 + e-Cu3 Sn) for various soldering... substrate. However, with the longer welding time such as 60 and 300 s, the Cu3 Sn IMC was formed at the interface between Cu6 Sn5 and Cu substrate. With the increase of soldering time, the thickness of total......
"传热法"炉缸和"隔热法"陶瓷杯复合炉缸炉底分析赵宏博,程树森,赵民革摘 要:从传热学的角度出发,利用VC编制炉缸炉底温度场计算软件,对国内某些高炉进行了实例建模.模型计算结果和实际高炉热电偶温度数据吻合较好.据此对目前流行的"传热法"的高导热压小块炭砖炉缸和"隔热法"的陶瓷杯复合炉缸炉底的各自特点进行了分析,以实例为基础阐明了这两种结构的炉缸炉底延长高炉寿命的不同方法.指出在铁水和耐火材料之间低导热系数的"保护壳"存在,是不同设计延长炉缸炉底寿命的相同本质,并分析了这两种结构的炉缸炉底的不足.
. The interface of the joint produced at 255 ℃ with various soldering times was analyzed by scanning electron microscope (SEM), X-ray energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results show that CuZn IMC forms preferentially within the Cu substrate. The Cu5Zn8 IMC forms by the reaction of CuZn with Zn atoms diffused from the solder. The effect of the soldering time......
of minor Nd. However, adding 0.5% Nd into Sn-9Zn alloy leads to the formation of large "cross" shaped NdSn3 intermetallic compound (IMC). Under the conditions of lower soldering temperature or shorter soldering time, the addition of trace Nd in Sn-9Zn could improve the spreading properties. With the increase of soldering temperature or soldering time, the spreading property of Sn-Zn-Nd alloy......
高温炉管断裂的两种机制 阿不都1,董泰斌1,沈复中2,丁毅2 (1.塔里木油田分公司,新疆,泽普,844804;2.南京工业大学,南京,210009) 摘要:通过对过热炉管受热冲击影响的事件考察,指出了在高温炉管的断裂中存在着超温引起过早的蠕变断裂,通常有明显的变形和热冲击导致快速的脆性断裂两种不同的机制.在失效成因的分析中,讨论了Manson-Haferd参量外推技术,热应力沿壁厚的分布和热冲击产生应力峰值问题,给出了热冲击的安全曲线. 关键词:断裂机制; 炉管; 失效; 热应力; 蠕变分析; [全文内容正在添加中] ......
焚烧炉炉体腐蚀原因分析 薛福连1 (1.沈阳市辽中县化工总厂,辽宁,辽中,110200) 摘要:对尾气热焚烧用焚烧炉炉体的腐蚀情况进行了分析,结果表明,炉体腐蚀主要是由露点腐蚀和应力腐蚀造成的,并提出了相应的防护措施. 关键词:焚烧炉; 腐蚀; 防护措施; [全文内容正在添加中] ......
工业炉用Na2SO4/SiO2复合蓄热材料的研究 张仁元1,李爱菊1,柯秀芳1 (1.广东工业大学材料与能源学院,广州,510090) 摘要:为改善工业炉高温烟气余热回收设备中蓄热材料的性能,本研究成功地研制了Na2SO4/SiO2显热/潜热复合蓄热材料,并讨论了烧结温度和时间,成形压力,添加剂等因素对复合蓄热材料热物性,致密度和抗压强度的影响.这种复合蓄热材料继承了传统蓄热材料的优点,同时又结合了相变材料的长处,克服了二者的不足,从而具有稳定性好,蓄放热快和蓄热密度高的性能. 关键词:Na2SO4 SiO2 蓄热材料; [全文内容正在添加中] ......