共查询到20条相似文献,搜索用时 187 毫秒
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合理的炉缸冷却制度是保证大型高炉长寿的基础,不同冷却制度对高炉炉缸的温度分布和侵蚀状况具有直接影响.结合某4000 m3级高炉,根据传热学理论建立了高炉炉缸、炉底温度场物理模型和数学模型,通过数值模拟对"大水量、小温差"和"小水量、大温差"这两种不同炉缸冷却制度进行了研究,分析了不同冷却制度对炉缸温度场、炉缸侵蚀状况及高炉寿命的影响.结果表明,在炉役初期砖衬较厚时,不同冷却制度对炉内温度分布的影响区别不大;随着砖衬的不断减薄,不同冷却制度对炉内温度分布的影响逐渐明显;当砖衬侵蚀到一定程度后,再好的冷却也无济于事,但采用"大水量、小温差"并加强冷却可以减缓砖衬的侵蚀,延长高炉寿命. 相似文献
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佘京鹏陈钢许领舜沈大伟 《炼铁》2013,(4):22-27
结合高炉铜冷却壁使用经验,对铜冷却壁的应用特性进行了阐述。认为,采用压延铜板焊接铜冷却壁可实现"无过热的冷却",另外,在采用铜冷却壁时,必须预防"氢病",应注意高炉内型尺寸的调整,并关注渣皮脱落问题。 相似文献
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传统的成品皮带冷却方式是在尾部皮带上"打水",这会造成"水洗"烧结矿的现象,使烧结矿粉化严重.改为在皮带返回时对其进行喷淋冷却后,烧结矿处于自然冷却状态,其成品率提高,质量改善,取得了很好的经济效益和社会效益. 相似文献
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湘钢1号高炉铜冷却壁水管出现大量破损,其原因主要是剪切应力大、铜冷却壁承受热负荷波动大、炉腹角偏大,以及"氢病"的影响。从工艺控制、在线维护、设备改造多方面提出了冷却系统的维护措施,即在线养护、穿管恢复冷却、安装铜冷却柱、硬质压入造衬、外部喷水冷却、提高水量和水速、调整生产操作制度。认为在铜冷却壁的使用过程中,控制热负荷的稳定和渣皮的厚度是铜冷却壁正常工作的关键。 相似文献
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P110级石油套管淬火组织形态对残余应力的影响 总被引:1,自引:0,他引:1
以降低P110级石油套管淬火冷却过程中的热应力和组织应力为目的,提出了水淬+空冷和水淬+空冷+水淬两种冷却方式。利用逐层钻孔法测试了不同工艺下的残余应力,分析了淬火组织特征和残余应力对裂纹产生和扩展的影响。结果表明:直接淬火工艺的淬火组织为板条马氏体和孪晶马氏体共存,且孪晶马氏体的含量较多。水淬+空冷和水淬+空冷+水淬两种工艺的淬火组织为板条马氏体、下贝氏体和不同程度的残余奥氏体,水淬+空冷+水淬工艺中还有少量孪晶马氏体。水淬+空冷、水淬+空冷+水淬两种冷却方式和直接淬火工艺相比,钢管内的切向和轴向残余应力均减小,从而易减小钢管的变形,以及降低和缓解了钢管内微裂纹的产生和扩展趋势。 相似文献
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介绍了新疆八一钢铁集团公司转炉炼钢厂设备冷却水的历史与现状,对LF-25t钢包精炼炉设备冷却水系统原设计存在的问题进行了分析,并对其实施设计改造。改造后满足了精炼炉设备冷却的要求,节约了水资源,经济效益显著。 相似文献
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《钢铁冶炼》2013,40(8):598-604
AbstractThe aim of the paper is to design the new wide plate mill. The work on the new cooling technology was supported by extensive laboratory testing while a simulator with full scale testing of cooling units was used. The principal objective of the investigation was to establish the design specification of equipment for accelerated cooling, particularly with respect to the product dimensions and steel grades. The possibilities of accelerated cooling are limited by technical parameters of cooling equipment such as thickness of water layer, flowrate, spray height, position of cooled surface to the nozzles and water or plate speed. These parameters were studied for different product temperatures and water impingement densities from 50 to 110 l s?1 m?2. The heat transfer coefficient was determined and compared for each case. There were three recognised significant cooling regions: water layer region, impinging jet region without water layer and impinging region with water layer, which must be taken into account. The application of the new cooling technology showed better flatness product and productivity higher than previous accelerated cooling system, even shorter cooling length. The rejection ratio by flatness problem of new mill was nearly half of the previous one. 相似文献
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《钢铁冶炼》2013,40(5):377-386
AbstractA two-dimensional heat transfer model was developed for the secondary cooling system during beam blank continuous casting. The finite element method was used to calculate the heat transfer. Accurate cooling boundary conditions in the secondary cooling zone are involved, including spray water cooling, water evaporation cooling, radiation cooling and roll contact cooling in the casting direction and non-uniform distribution of spray water flow density in the cross-section. The causes of longitudinal crack at the fillet during Q235 steel continuous casting were analysed on the basis of the simulation of the developed model, and then the spray water flow and the transverse nozzle layout were optimised. Practical results show that the surface quality of the beam blank improved after optimisations. Numerical results from the present model were validated using previous experimental measurements, which show good agreement. 相似文献
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借助光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)等设备,通过力学性能测试和显微组织观察,探究炉冷、水冷、石棉缓冷三种不同冷却方式对C61钢热轧态组织和性能的影响,对比不同状态下试验钢的性能。试验结果表明:冷却速度对试验钢的性能影响较大,由于冷却速率V水冷>V石棉缓冷>V炉冷,导致试验钢在水冷条件下强度、硬度均高于炉冷和石棉缓冷处理时的性能;热轧后经水冷,试验钢的抗拉强度(Rm)和断面收缩率(Z%)分别为1450 MPa和62.7%,XRD分析得知,热轧后随冷却速率增加钢的残余奥氏体含量增多,面心立方的奥氏体有利于提升试验钢的韧性。可见,热轧水冷后的试验钢经过950℃加热1 h,水淬,经过-73℃冷处理1 h后,恢复到室温,最后在482℃回火16 h,空冷至室温是最佳工艺方案。 相似文献