共查询到17条相似文献,搜索用时 210 毫秒
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中心锥体筒仓库底结构的先进性使其在水泥工艺中得到了大量的应用,但由于其结构受力复杂,目前的结构设计多由经验和构造确定。参照中心锥体生料均化库工程实例,进行了缩尺模型试验,研究了高径比、卸料速度以及卸料模式对仓壁及锥体侧压力动态效应的影响。将测试结果与理论计算进行对比得出超压系数,为中心锥体筒仓设计提供依据。 相似文献
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筒仓贮料侧压力计算是筒仓设计中非常关键的问题,本文结合现行《钢筋混凝土筒仓设计规范》GB 50077—2003对大型浅圆仓仓壁侧压力计算理论进行探讨。并以工程实例对熟料库侧压力的计算做了介绍,为今后设计提供参考。 相似文献
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1问题分析《钢筋混凝土筒仓规范》GBJ77-85对直径小于或等于15m的圆筒仓仓壁厚度取值作了规定,而直径大于15m的情况未提及。本文以散装储库为例,探讨直径大于15m的圆筒仓仓壁厚度的合理取值。确定仓壁厚度需进行三种计算:强度计算、变形验算及裂缝宽度验算。根据规范GBJ77-85,圆筒仓的仓壁为-圆柱薄壳,强度计算时按无矩理论计算其薄膜内力。贮料侧压力作用下产生的环向拉力全部由环筋承担,与仓壁厚度无关;而仓顶荷载、仓壁自重、贮料摩擦力、风载、地震作用等共同作用下产生的竖向力由混凝土及竖向钢筋承担,由此确定的仓壁厚… 相似文献
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伊堡中心圆锥式筒仓倒立的内锥以库直径为跨度直接支撑在库壁上,不需要中间任何竖向支撑承担来自上部的荷载,包括巨大的物料荷载.跟锥体物料荷载比较起来卸料设备重量比如中间仓、收尘器均可以被视为很小,因此可以直接将这些设备平台支撑在锥体上而无需单独的柱及基础.在具备这样的经济性的同时也兼顾了结构的力学优势,巨大的竖向荷载传递途径以及对支撑库壁及基础的设计清晰明了. 相似文献
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大直径熟料库在水泥生产线上应用广泛.在物料水平侧压力作用下,筒仓仓壁结构的环向主要以受拉为主,随着筒仓直径的增加,环向拉力明显增加.预应力技术采用高强度钢筋或钢绞线,通过对混凝土施加预应力,可以提高结构的承载力和有效控制混凝土裂缝的开展,特别适合大直径熟料库的结构设计.SJW5000 t/d熟料水泥生产线Ф60.0 m... 相似文献
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料仓内的粉体静态应力分布是指导料仓设计和运行的重要参数之一。本文在三维有机玻璃料仓中,对料仓应力分布进行试验研究,利用应力传感器对料仓壁面及粉体内部水平、竖直应力进行研究,获得料仓中粉体内部应力的分布规律,并基于拱效应对料仓中的应力分布进行理论研究。结果表明:料仓内部水平应力与距出口及料仓中心的距离基本无关,壁面处的水平应力在筒锥结合处达到最大值且随加料高度的增加大幅度增加。料仓内部垂直应力的最大值出现在筒锥结合处近筒段的料仓中心位置。同一平面,从料仓中心至仓壁,垂直应力呈逐渐减小的趋势。随加料高度的增加,垂直应力均逐渐增加。在壁面处,侧压力系数随着距出口高度的增加出现先增大后减小的趋势,在筒锥结合处大于1。 相似文献
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利用EDEM软件对一种普通锥形和两种双锥型螺杆挤出机固体输送段进行模拟.分析了高密度聚乙烯(PE-HD)颗粒在锥形双螺杆挤出机内的运动状态和分布规律.对比分析了3种锥形螺杆挤出的质量流速率、填充率、平均速度、平均压力、平均剪切应力和力矩等参数,给出了普通型和双锥型螺杆挤出机固体输送机理以及主要影响因素.结果表明,相比于... 相似文献
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依据老挝KCL项目的大直径熟料库实仓测试成果对上浮式廊道浅圆仓展开分析。在生产环境下对熟料库贮料压力进行测试,发现贮料静止时仓壁处水平压力随埋深的增加而加大,卸料时会出现无规律的波动,但整体呈现减小趋势;廊道顶面的压力值在卸料会出现较小的超压现象,但随卸料的持续总体也逐渐减小。 相似文献
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Marek Markowski Ireneusz Bialobrzewski Janusz Bowszys Stanislaw Suchecki 《Drying Technology》2013,31(9):1527-1536
A neural-deterministic simulation model applied for calculating distributions of temperatures and moisture content in a bed of wheat stored in a steel silo without aeration is presented in the article. The model consists of differential equations of heat and moisture transfer, initial and boundary conditions, and three artificial neural networks used during simulated ambient air conditions. Experiments and computer simulations were carried out in order to determine temperature fields in wheat grain stored in a steel silo for two months. The computer simulations were carried using MATLAB and FEMLAB software. The difference between measured and simulated temperature in grain near the silo wall at a height of 2.5 m from the bottom was less than 3.0°C. On the basis of the analysis performed it was concluded that the temperature distributions obtained with the model were consistent with the measured results obtained for grain stored in a steel silo without aeration. 相似文献
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Marek Markowski Ireneusz Bialobrzewski Janusz Bowszys Stanislaw Suchecki 《Drying Technology》2007,25(9):1527-1536
A neural-deterministic simulation model applied for calculating distributions of temperatures and moisture content in a bed of wheat stored in a steel silo without aeration is presented in the article. The model consists of differential equations of heat and moisture transfer, initial and boundary conditions, and three artificial neural networks used during simulated ambient air conditions. Experiments and computer simulations were carried out in order to determine temperature fields in wheat grain stored in a steel silo for two months. The computer simulations were carried using MATLAB and FEMLAB software. The difference between measured and simulated temperature in grain near the silo wall at a height of 2.5 m from the bottom was less than 3.0°C. On the basis of the analysis performed it was concluded that the temperature distributions obtained with the model were consistent with the measured results obtained for grain stored in a steel silo without aeration. 相似文献