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随着经济的快速发展,我国城市化的进程在不断加快,城市化进程加快的同时也带动了市政建设的发展,而市政建设中市政道路桥梁的工程质量对人们的生活影响较大,从某种意义上说反映了当地城市化的发展水平。市政道桥工程容易出现很多质量问题,例如:沥青质量差、钢筋锈蚀严重、铺装层面及钻孔灌注桩的质量隐患等,影响道桥的使用寿命和投入使用后的安全,所以,为了城市化的进程以及市政工程建设的可持续发展,我们一定要确保路桥工程建设质量。本文根据笔者工作经验,对市政道桥工程施工中常见的质量问题及预防治理措施进行了探讨。 相似文献
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加压下填料塔中液相轴向反混的研究 总被引:2,自引:0,他引:2
Liquid phase axial mixing was measured with the tracer technique in a packed column with inner diameter of 0.15m,in which the structured packing,Mellapak 350Y,was installed.Tap water as the liquid phase flowed down through the column and stagnant gas was at elevated pressure ranging from atmospheric to 2.0MPa.The model parameters of Bo andθwere estimated with the least square method in the time domain.As liquid flow rate was increased,the liquid axial mixing decreased.under our experimental conditions,the effect of pressure on Bo number on single liquid phase was negligible,and eddy diffusion was believed to be the primary cause of axial mixing in liquid phase. 相似文献
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An experimental study on the axial dispersion of liquid was carried out in a 0.382-m-ID flotation column packed with different structured packings or free of packings. The correlations of axial Peclet numbers with the liquid and gas superficial Reynolds numbers were developed for various packings. Among the packings tested, it is found that in the column packed with 250Y or 350Y packings the axial dispersion is the lowest. The addition of frother can decrease the axial dispersion. By the simulation analysis of the one-dimension dispersion model of packed flotation column, it is found that small axial dispersion, high collection rate constant and low axial liquid velocity can increase the collection zone recovery. 相似文献
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以二维扩散模型为基础,采用点源脉冲示踪法对开式浮选柱和装有不同类型规整填料的充填式浮选柱内液相的轴向与径向返混进行了实验研究,得到了各种填料内轴向和径向彼克列准数与气相、液相表观雷诺数的关联式。通过比较发现,在所用填料中,装有250Y或350Y型填料的浮选柱不仅轴向返混最小,而且径向返混最大,最有利于提高回收率。另外,对起泡剂的影响进行了实验研究,发现起泡剂可以减小返混,但当起泡剂浓度大于一定值时反而会增大径向返混。 相似文献
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本文报告了一起变质鲐巴鱼引起的过敏型食物中毒,造成822人中毒,无一例死亡。洗胃液组胺试验弱阳性,采样的生熟鲐巴鱼定量分析组胺含量分别为740mg%和330mg%及700mg%(熟)。1990年3月2日至3日,江西省吉安市发生822例以颜面潮红、头痛、头晕、心悸、恶心、口舌发麻、瞳孔散大等临床表现为主的病人。通过流行病学调查,实验室检验,证实为鲐巴鱼变质产生的高组胺中毒所致。 相似文献
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