共查询到19条相似文献,搜索用时 52 毫秒
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液化石油气具有易燃、易爆的特性,液化石油气储罐区的设备必须设置安全阀,但储罐区涉及到的安全阀比较多,如何确定这些安全阀的开启压力,本文就对对影响确定储罐区设备上的安全阀开启压力进行了分析计算。 相似文献
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通过研制蒸汽安全阀冷热态检验设备并进行大量试验,探讨与分析蒸汽安全阀冷热态校验差异,提出蒸汽安全阀热态校验方法并对检验规程提出修改建议。 相似文献
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现阶段,我国科学技术实现了较好的发展,进而推动了工业的进步,并让各类科技成果在实践的过程中实现了良好的运用.安全阀属于工业锅炉压力容器的主要构成部分之一,能够确保锅炉稳定、安全的运行.所以,需要增强对安全阀的修理与检验,防止安全事故的出现. 相似文献
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安全阀作为电站锅炉上的一种重要设备,对其在运动中的动态稳定性要求,是至关重要的,这一点无论从我国标准,还是ASME动力的锅炉法规的要求中,都可以充分体现出来,本文着重探讨安全阀排放量的大小对其在系统上的动态稳定性的影响,提出一种合理的安全阀选型原则。 相似文献
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文中对锅炉降压运行后进行安全阀排放量校核的必要性进行了阐述,并介绍了在更换过程中采用安全阀排放量的计算公式进行选型的实用方法。 相似文献
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Subcooled water critical flow phenomena in a safety valve are investigated experimentally at various subcoolings between 10 and 125 K, and about 1 MPa of the inlet pressure with three different disk lifts, 1, 2, and 3 mm. The purpose of this experiment is to find the effects of subcooling and disk lift and to visualize flow patterns in a safety valve when the critical condition is established. All of the experiments show the critical characteristics such as constant throat pressure and constant flow rate when the back pressure is sufficiently decreased. Two correlations, critical pressure ratio and non-equilibrium factor, are developed by using the present experimental data represented in the form of non-dimensional disk lift, subcooling, and pressure. Critical pressure ratios and non-equilibrium factors are considerably affected by different subcoolings while the effect of disk lifts on them is relatively small. A non-equilibrium critical mass flow correlation for the safety valve is also developed based on Fauske's non-equilibrium model and the presented experimental data. The predictions of the correlation are within ±11% of the experimental data. 相似文献
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A method for determining time‐optimum medium temperature changes is presented. The heating and cooling of the pressure elements will be conducted in such a way that the circumferential stresses caused by pressure and fluid temperature variations at the edge of the opening and point of stress concentration do not exceed the allowable values. However, the calculated optimum temperature changes are difficult to follow in practice during the initial stage of heating. Nevertheless, it is possible to increase the fluid temperature stepwise to the minimum value and then heat the pressure component according to the determined optimum temperature changes. Allowing stepwise fluid temperature increase at the beginning of heating ensures that the heating time of a thick‐walled component is shorter than the heating time resulting from the calculations according to EN 12952‐3 European Standard or TRD 301 (Technische Regeln für Dampfkessel) regulations. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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燃煤热水锅炉运行安全性探讨 总被引:1,自引:1,他引:0
采用大容量燃煤热水锅炉是符合我国国情、改善环境质量的重要举措,势在必行.但是大容量燃煤热水锅炉安全运行是需要十分关注的问题.分析了热水锅炉出现故障的原因和解决办法,并以实例分析说明角管式燃煤热水锅炉不仅很好地解决了热水锅炉运行的安全性问题,而且有利于节约能源和改善燃煤热水锅炉使用地的周边环境. 相似文献
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1前言 在东风4和东风11型机车辅助传动装置中,冷却风扇的驱动采用了先进的静液压传动技术.在该系统中装有两个特制的安全阀.此阀与市场上出售的安全阀不同之处在于它的开启压力不是定值,而是能随油泵转速变化进行自动调节的变值. 相似文献
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概述了型煤的燃烧特点,分析了工业型煤燃烧对锅炉结构的要求,并阐述了目前型煤燃烧急需解决的问题. 相似文献