共查询到20条相似文献,搜索用时 218 毫秒
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介绍了离心式纺丝机生产粘胶长丝存在的问题,连续式纺丝机的优越性以及连续式纺丝机的最新发展,指出了尽快改造和更新原有设备,推广应用连续式纺丝机的必要性。 相似文献
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现代医院含有放射性同位素的废水处理通常都是采用衰变法,衰变池有连续式和间歇式,最常用的是连续式.通过比较分析连续式和间歇式衰变池的优缺点,提出了一种带缓冲池的连续式衰变池,使其功能得到改进,增加了使用中的可靠性,有利于避免或减少放射性污染事故的发生. 相似文献
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用悬浮填料反应器对生活污水进行生物处理的实验研究,结果表明,间歇式运行方式对氮的硝化不如连续式运行方式的效果好,对有机物的降解间歇式运行方式与连续式运行方式没有明显的差异。主要原因可能是间歇式运行方式周期性的变化使硝化只能在部分反应时间内进行,硝化细菌的生长也受到影响。 相似文献
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介绍了气动连续式生物过滤技术在去除聚氯乙烯废水中COD的应用,以及气动连续式生物过滤技术的优点和效果。 相似文献
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辐射管搪烧炉热工性能分析 总被引:3,自引:1,他引:2
对辐射管搪烧炉炉内辐射换热和对流换热进行了分析,结果表明,提高辐射管和工件的黑度及炉内介质与辐射管和工件的对流换热系数可显著提高工件表面总热流,而炉幸嘿 度及介质与炉叶流换热系数对工件表面总热流几乎没有影响,此外,加强炉墙绝热可提高工件表面热流,但作用是有限的,尤其是对连续式辐射管炉,这种效果更为有限。 相似文献
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Radiation is usually the dominant mode of heat transfer in furnace enclosures. The imaginary planes method is one of the new methods for calculating the radiative heat transfer in such systems. In this study, a general procedure was developed for its application in furnace modelling. Various case studies were carried out for a number of furnaces, and the results were compared with those of the zone method. It was found that the new method combines good accuracy with low computation time and appears to be a promising method for the determination of heat flux and temperature distributions within furnace enclosures. 相似文献
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本文叙述了以区域法计算辐射传热的数学模型。在区域法中,系统被分为表面区和气体区,区域数取决于所要求的结果精度和计算时间。炉子的温度分布可通过解每区的能量平衡而得。作为Hottel和Cohen的原始开发,直接交换面积限于立方体和正方形;本文给出了在方箱炉、圆筒炉中任何两区之间直接交换面积方程式的推导。这些方程式可适用于任何大小的矩形、共轴圆筒壁、炉底环形区和其他形状。 本文提供了一个关于烃类一段蒸汽转化炉和圆筒炉的设计方法。计及反应动力学、对流传热、管内压降,采用区域法计算这些炉子的温度分布,从而预言工艺气、烟气、管表面和耐火墙表面的温度分布。计算结果与工厂实测数据相吻合。 相似文献
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利用假想平面法建立了室式辐射管搪烧炉传热数学模型,并进行了仿真计算,结果表明,假想平面法能够大大简化室式辐射管搪烧炉内大量的角系数的计算,并可对炉子的有关参数(如辐射管的距径比、布置、炉墙结构等)进行优化计算。 相似文献
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Elmar Scholand 《化学,工程师,技术》1981,53(12):942-950
Modern procedures for calculation of radiational heat transfer in fueled tubular furnaces . The zone method due to Hottel, the Monte-Carlo method and the flux method are of great importance for the calculation of radiational heat transfer in combustion chambers, along with simple zero- to two-dimensional models. Only the first three methods can be used for three-dimensional problems. The zone method and the Monte-Carlo method are mathematically exact, while the flux method gives only approximate values. The radiational heat transfer to the pipes of a cracking furnace is calculated by a simple zero-dimensional zone method to show, for example, that simple models often also give reasonable results. 相似文献
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通过对国内外燃磷塔的分析比较,设计了一种具有辐射换热面的新型燃磷塔。实际运行结果表明,该塔不仅能保证磷酸的正常生产,而且可以副产出相当数量饱和蒸汽,实现高效率的余热回收。燃磷塔内的传热以辐射为主,为此提出了一种计算理论燃烧温度和烟气排放温度的工程方法,通过该法计算的理论值和实测数据吻合较好,能满足工程计算的精度要求。 相似文献
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A seventy-two hour test was carried out on a continuous side-fired regenerative glass tank furnace with five oil burners on each side. A novel feature of this furnace was the insulation of the entire silica brick cap by means of a high temperature insulating brick. A complete record of the furnace operation during this period is given. Temperature measurements were made a t various points in the furnace and regenerator. A feature of the temperature observations is the great magnitude of the radiation correction when hot gases are flowing through passages lined with cooler brick work. The method described by Kreisinger and Barkley was used in making these measurements. This method could be employed for direct reading of true temperature at any point in the regenerative system. The heat balance of the complete furnace system between points at bottom of regenerators is given. Possible savings of fuel amounting to 14% of the total fuel burned are shown. An important fact brought out by this heat balance is that leakage through furnace brickwork is as prolific a source of heat loss as flow of heat through them by conduction. 相似文献