共查询到19条相似文献,搜索用时 125 毫秒
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加热炉内钢坯氧化烧损影响因素分析 总被引:1,自引:0,他引:1
钢坯加热过程中的氧化烧损一直是钢铁企业十分关注的问题。氧化烧损的出现不仅降低了钢坯的导热系数进而降低了加热炉效率而且影响了出炉钢坯的质量,带来了巨大的经济损失。以某钢厂步进式加热炉加热普碳钢为例,从加热温度、加热时间、炉内气氛、闷炉、热装这5个方面来分析钢坯氧化烧损影响因素并给出建设性意见,为后续的技术改进提供参考依据。 相似文献
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针对济钢-小型推钢式加热炉存在的能耗高、加热能力小、氧化烧损大、加热质量差等问题进行了技术改造,达到了节能降耗、适应生产的目的。 相似文献
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加热炉脉冲燃烧与比例燃烧的测试分析 总被引:1,自引:0,他引:1
本文通过对某钢铁厂3#加热炉在脉冲燃烧与比例燃烧工况下进行测试分析和比较,得出脉冲燃烧的优点在于:钢坯氧化烧损率低,炉内区域温度均匀性好,NO生成量少。本测试中未发现脉冲燃烧比比例燃烧节能高效。 相似文献
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A numerical model of billet reheating furnace is proposed, which includes heat fluxes calculation around four billet surfaces and two-dimensional conduction calculation inside billet. Radiation and convection heat fluxes on top and bottom surfaces are calculated simultaneously, based on quartic and linear difference between furnace gas and billet surface temperatures, while furnace gas temperature is determined according to thermocouple values along furnace length together with billet surface temperature. Lateral fluxes are also calculated considering angle factor on billets interval. Two-dimensional partial differential equation is acquired for billet conduction to determine temperature distribution, which is discretised and solved by Alternating Direction Implicit and TriDiagonal Matrix Algorithm. Two embedded thermocouple experiments were carried out to verify furnace gas temperature, the effect of billet interval on lateral heat flux calculation as well as billet temperature. It met agreement well with experiments on billet temperature, which could be a better prerequisite for further reheating furnace automatic control. 相似文献
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摘要:通过数值模拟的方法研究了典型大方坯(325mm×280mm)连铸过程中温度场和应力场分布,分析了铸坯皮下裂纹产生的原因和主要影响因素,制定了控制铸坯皮下裂纹的具体措施。结果表明:在连铸过程中铸坯的最大回温为121℃,二冷一区最高回热速率达到217.48℃/m,二冷二区最高回热速率达到131.95℃/m,其他各区回热速率都较低。温度回升后铸坯横断面距铸坯表面15~30mm处的最大应力应变值已经超过了钢的极限应力应变值,因此,二冷一区和二区温度回升是铸坯产生皮下裂纹的主要原因。增加二冷一区水量,将此水量在二冷三区和四区相应地减小,可以降低二冷一区回热速率,降低最大回热温度到88℃,控制铸坯皮下裂纹的产生。 相似文献