共查询到18条相似文献,搜索用时 234 毫秒
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为了便于对托圈进行维护,在转炉托圈上开设了两个人孔。应用了有限元法,在考虑托圈约束、承载、热辐射等因素的情况下,对不同倾动角度工况下的转炉托圈热应力进行了仿真。通过仿真结果对比发现,开孔后托圈开孔处应力略增大,但托圈仍在安全使用范围内。 相似文献
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托圈作为转炉炼钢的主体设备,为达到经济运行的目的,要求其寿命越长越好.目前唐钢第二钢轧厂有4座50 t转炉,使用的托圈均为非水冷式托圈,托圈使用期限最多为2年,造成转炉运行中备件修复和检修成本居高不下.为解决此问题,对转炉托圈进行水冷式改造. 相似文献
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A detailed 3D finite element (3DFE) model is developed to investigate the applicability of Westergaard’s curling stress equations to doweled jointed concrete pavements. The model does not rely on any of Westergaard’s assumptions and is capable of handling nonlinear and/or time‐dependent temperature profiles. However, only linear gradient is applied to facilitate the comparison with Westergaard’s results. The transverse stress calculated using Westergaard’s formula was found to be within 10% of that computed using 3DFE. Westergaard’s longitudinal stress equation required a correction. The 3DFE results confirm Westergaard’s finding that the slab curling stresses are independent of slab length. Thus, curling stress does not explain the field‐observed dependency of mid‐slab cracking on the slab length. Through the examination of the mechanism of dowel‐concrete interaction, it is shown that uniform temperature changes play the major role in mid‐slab transverse cracking of relatively long slabs. Due to built‐in slab curling as well as temperature or moisture curling, the dowel bars bend restricting the slab from free contraction due to uniform temperature drop. This gives rise to a large component of stress that has not been considered in previous investigations. Application of a combined temperature gradient and uniform temperature drop to slabs of different lengths revealed the dependency of mid‐slab transverse cracking on slab length. 相似文献
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A full-scale finite-element stress model of a slab and its mould was developed to analyse the non-uniform slab shrinkage of special steel in a vertical caster during slab continuous casting. The stress model was based on the heat transfer model which was validated by comparing the calculated temperature with the measured ones. According to the shrinkage calculation, the single linear taper is not suitable for the continuous casting of this special steel, and the narrow face taper need to be calculated and optimised. It will provide a helpful tool for further improving the casting parameters and operations for special steel. 相似文献
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结合玉溪新兴钢铁有限公司的生产实践,通过对现场调研收集的大量实际运行数据进行分析,得到方坯、板坯设备及结晶器供水情况,提出该循环水系统的最佳设备改造方案。生产结果表明,改进后,结晶器水、设备冷却水水温下降10℃,软水使用量明显下降。 相似文献