共查询到19条相似文献,搜索用时 109 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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阐述锅炉安全阀弹簧失效的原因,分析锅炉安全阀弹簧受轴向(或静)载荷、非中心载荷、冲击载荷下的受力影响,提出了预防锅炉安全阀弹簧失效的措施。 相似文献
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本文针对某电厂130 t/h高温高压循环流化床锅炉安全阀不起跳问题,进行了现场检查和测量后,对安全阀不起跳原因进行了分析,并对该锅炉安全阀改造方案做了简要介绍,最后对锅炉安全阀及其排放管道的设计和安装提出了一点建议。 相似文献
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分析了普通弹簧直接载荷式安全阀,压力自紧式安全阀,双作用先导式安全阀的工作原理和由此带来的性能差异,阐述了爆破片的类型和各自的主要特点,提出了化工行业安全泄放装置-安全阀,爆破片和隔离式安全阀的特点和适用场合以及安全泄压装置的正确选型原则。 相似文献
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本方叙述了安全阀动态不稳定性-频跳的本质,并通过对电站锅炉安装于汽包和过热器上不同位置的安全阀进行分析、计算,最终得出安全阀最大排量的校核公式,该公式与《安规》阀启闭压差的要求相结合,用于校核安全阀械作的动态稳定性,具有广泛的通用性。 相似文献
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阐述了F-250/400-1型安全阀的工作原理,分析了安全阀动作之后不能自动关闭的原因,提出了解决问题的方法。 相似文献
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安全阀使用中应注意的几个问题及预防 总被引:1,自引:0,他引:1
安全阀是承压设备的重要安全保护装置.文章阐述了安全阀在安装过程中经常发生的问题,安全阀在使用中产生泄漏的原因及预防和安全阀密封面损坏的修理. 相似文献
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《Applied Thermal Engineering》2007,27(11-12):1911-1922
The pressure in carbon dioxide (CO2) refrigeration system is very high, and it is necessary to install a safety valve in the refrigeration system so as to release some amounts of CO2 refrigerant through the valve as well as its downstream line into the atmosphere to eliminate overpressure. But solid CO2 might be observed in the safety valve or its downstream line and disturb the expected function of the safety valve. As the releasing flow through the safety valve is very complex and difficult to be studied, a needle valve has been used to substitute the safety valve and to control the openings in the present paper. An experimental setup to simulate the refrigerant flow through the valve and its downstream line has been developed in order to reveal the influence of the upstream vapour quality and the opening of the throttle valve on the freezing and blockage of CO2 in the safety valve and its downstream line under the upstream pressure of 5.7–6.1 MPa. The solid CO2 will block the valve itself when the mass flow rate becomes less than 0.007 kg s−1; and it will block the downstream line when the mass flow rate is larger than 0.03 kg s−1. The blocking and de-blocking in the downstream line has shown periodic characteristics. The period increases with the upstream vapor quality, which varies from 0.7 to 16 s. And it is recommended to avoid oversize of the downstream line of the safety valve and to install a device to eliminate static electricity in the downstream line. 相似文献
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文章分析了蒸汽安全阀校验装置的结构以及校验方法的优劣,证明蒸汽用安全阀采用蒸汽介质校验比采用常温氮气等校验更接近实际工况,校验结果准确可靠。通过研究高效非电内加热式小型蒸汽发生器,构建中小型高温安全阎校验装置,并利用饱和蒸汽进行安全阀的模拟高温工况来对上述方法进行验证。 相似文献
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孙琦 《中国锅炉压力容器安全》2014,(9):37-39
安全阀调节圈的位置正确与否是其性能指标的重要影响因素之一。目前,由于检验条件的影响,存在因调节圈位置不当造成安全阀技术性能指标不合格的现象。本文从安全技术规范要求、调节圈工作原理及目前存在问题等角度出发,分析其原因并提出相应解决问题的方法。 相似文献
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Heuy-DongKim Jun-HeeLee Kyung-Am Park ToshiakiSetoguchi ShigeruMatsuo 《热科学学报(英文版)》2006,15(4):355-360
A safety valve functions to control an upper limit of pressure inside the LNG line of transportation.If the pressureinside the safety valve nozzle exceeds a pre-determined value on the valve sheet which plugs the nozzle,an ex-cess of LNG discharges through the gap between the nozzle exit and valve sheet.In this situation,the forces act-ing on the valve sheet are gasdynamic forces generated by the discharge of LNG and mechanical forces supportedby the spring behind the valve sheet. The flow through the gap is very complicated,involving vortices,flowseparation,and shock waves.These affect adversely on the system accompanying with noise and vibration.Thepresent study aims at understanding the flow physics of safety valve.A computational work using the two-dimensional,axisymmetric,compressible Navier-Stokes equations is carried out to simulate the gas flow betweenthe nozzle exit and valve sheet,and compared with the theoretical results. It has been found that there exists adistance between nozzle exit and valve sheet in which the thrust coefficient at the valve sheet increases abruptly. 相似文献
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安全阀、勺排放性能是安全阀产品质量重要考核指标之一,电站锅炉安全阀由于压力高、排量大无法通过实际工况模拟牝测试其排放性能,本文通过对拉法尔喷嘴气体稳定流动的质量流量展开分析,说明采用排量系数法评估安全l间排放性能具有很高的可靠性、操作性。 相似文献