共查询到19条相似文献,搜索用时 62 毫秒
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介绍了鞍钢股份第三炼钢连轧厂260t转炉采用的挡渣镖挡渣工艺的布置、操作过程、主要工艺设备及参数,并将其与挡渣球挡渣工艺和气动挡渣工艺相比较,阐述了地面轨道型挡渣镖工艺的优点. 相似文献
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介绍转炉挡渣工艺的发展情况,重点分析了3种典型的转炉挡渣工艺.滑板挡渣技术挡渣成功率高且稳定,效果最佳,钢包渣层厚度可以稳定控制在50 mm以下;气动挡渣技术作为无形挡渣技术的代表,在运行成本方面存在一定优势;挡渣棒挡渣技术则由于适中的投资和良好的挡渣效果,应用最为广泛. 相似文献
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从挡渣球挡渣法、气动挡渣法到挡渣塞挡渣法的发展状况,评述了这几种挡渣技术在实际转炉挡渣过程中的原理、特点和效果。介绍了宝山钢铁股份公司采用新的挡渣工艺——转炉闸阀式挡渣技术的生产实际情况,应用结果表明,闸阀式挡渣效率大于95%。 相似文献
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转炉挡渣是普遍采用的一项技术,这项技术可以减少转炉出钢时高氧化性终渣流入钢包,减少转炉下渣回磷,减少钢水中夹杂物含量,提高合金收得率,提高钢包寿命,改善精炼造渣工艺。安钢通过对悬挂式挡渣机构的工艺研究,对挡渣棒的工艺参数进行优化,并作好挡渣机构的维护和保养,以及提高职工的操作水平。使挡渣机构的使用率达到995%,挡成率达到95%以上。能满足转炉出钢后挡渣的要求,并带来良好的工艺效果。 相似文献
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介绍了宣钢150 t转炉悬挂式挡渣装置的性能、主要参数、工作方式、事故处理,对比了挡渣球出钢挡渣和挡渣塞出钢挡渣的使用效果,最终确定了挡渣塞出钢挡渣工艺。生产实践表明,150 t转炉采用挡渣塞挡渣出钢,可有效控制出钢下渣量,减少钢水回磷,提高了钢水质量和合金收得率,实现了降本增效的目的。 相似文献
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通过对转炉出钢过程中前期渣、中期渣和后期渣的分析,系统对比了挡渣球、挡渣塞、气动挡渣和滑板挡渣等挡渣方式的挡渣效果。滑板挡渣通过PLC自动控制系统采集转炉倾动角度,同时利用红外下渣检测判断下渣量。根据挡渣工艺要求,滑动水口的全开或全闭可在0.5 s内自动完成,实现出钢过程中前期渣、中期渣和后期渣的最有效阻挡。与其他挡渣方法相比,滑板的挡渣成功率达到100%,转炉出钢下渣量控制在50 mm,回磷稳定控制在0.002%以下,降低了钢水氧化性,减少了合金消耗,提高了转炉成分命中率。 相似文献
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针对雾化过程中易被中断的情况,通过对雾化过程中喷嘴中轴气流场压力分布的测量和分析,对喷嘴系统进行了改进,即将导液管装入喷嘴并延伸人喷嘴中轴气流场负压区。结果表明,雾化过程稳定,雾化制粉效率提高。 相似文献
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The authors present a comprehensive consideration of the process characteristics of visual search in contexts that vary in their meaningfulness. The authors frame hypotheses regarding process architecture, stopping rule, capacity, and channel independence, using analytic results and a rigorously specified dynamic system to characterize a set of alternative hypotheses that vary along all of these dimensions. Results of the tests of these hypotheses suggest that process architecture and the stopping rule do not distinguish the processing of meaningful and meaningless forms. The major distinction between configural and nonconfigural processing was with regard to processing capacity, potentially implicating channel interdependencies. All of these conclusions hold for both faces and words. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
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安全生产是基本国策,矿山是高危行业,安全生产尤为重要,矿山安全事故多发生在采矿、掘进和剥离等作业环节.由于市场经济和企业股份多元化的推进,矿山采掘工程对外承包被广泛推广,项目单位可以减少大量投资,又可以利用社会力量,其管理工作必将发生转变与调整,如何搞好甲乙双方的合作,又能发挥工程承包的作用,保证安全生产,结合多年工作经验和管理中存在的问题,对工程承包施工企业深化管理进行了归纳和评述,可为其他矿山提供借鉴. 相似文献
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介绍针对柳钢120t转炉除尘OG系统风机叶轮粘灰振动频繁停机清灰问题,实施的对风机反冲洗装置进行的改造及反冲洗工艺的调整等措施。 相似文献
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Iterative reconstruction from single photon emission computed tomography (SPECT) data requires regularization to avoid noise amplification and edge artefacts in the reconstructed image. This is often accomplished by stopping the iteration process at a relatively low number of iterations or by post-filtering the reconstructed image. The aim of this paper is to develop a method to automatically select an optimal combination of stopping iteration number and filters for a particular imaging situation. To this end different error measures between the distribution of a phantom and a corresponding filtered SPECT image are minimized for different iteration numbers. As a study example, simulated data representing a brain study are used. For post-reconstruction filtering, the performance of 3D linear diffusion (Gaussian filtering) and edge preserving 3D nonlinear diffusion (Catté scheme) is investigated. For reconstruction methods which model the image formation process accurately, error measures between the phantom and the filtered reconstruction are significantly reduced by performing a high number of iterations followed by optimal filtering compared with stopping the iterative process early. Furthermore, this error reduction can be obtained over a wide range of iteration numbers. Only a negligibly small additional reduction of the errors is obtained by including spatial variance in the filter kernel. Compared with Gaussian filtering, Catté diffusion can further reduce the error in some cases. For the examples considered, using accurate image formation models during iterative reconstruction is far more important than the choice of the filter. 相似文献