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首页> 外文会议>2002 ASME Pressure Vessels and Piping Conference, Aug 5-9, 2002, Vancouver, British Columbia, Canada >THE EFFECT OF PRESSURE RELIEF VALVE BLOWDOWN AND FIRE CONDITIONS ON THE THERMO-HYDRAULICS WITHIN A PRESSURE VESSEL
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THE EFFECT OF PRESSURE RELIEF VALVE BLOWDOWN AND FIRE CONDITIONS ON THE THERMO-HYDRAULICS WITHIN A PRESSURE VESSEL

机译：泄压阀排污和着火状况对压力容器内热液的影响

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摘要

If a pressure vessel containing a pressure liquefied gas (PLG) is exposed to a severe fire, there is a chance the tank will rupture and possibility even explode. It has been shown that the energy stored in the liquid phase is important in the outcome of such an accident. In order to better understand tank failure and energy storage, it is desired to understand the complex thermo-hydraulic response of the lading prior to a thermally induced rupture. In the summers of 2000 and 2001, a series of controlled fire tests were conducted on horizontal 1890 litre (500 US gallon) propane tanks. The test tanks were instrumented with pressure transducers, lading and wall thermocouples, and an instrumented flow nozzle in place of a pressure relief valve (PRV). A computer controlled PRV was used to control pressure, while high momentum, liquid propane utility torches were used to heat the tank. PRV blowdown and fire conditions were varied in this test series while all other input parameters were held constant. It was found that the lading response and energy storage varied according to the fire conditions and PRV operation. The location and quantity of the burners affected the thermal stratification within the liquid, and the swelling and frothing at the liquid/vapour interface. The blowdown of the PRV affected average tank pressure, average liquid temperature and time to destratify. PRV operation caused enhanced convective cooling on the vapour space wall. The degree of blowdown dictated the pressure drop, and thus the liquid flashing and subsequent swelling were affected. This paper will discuss these thetmo-hydraulic responses and their role in the tank failure.
机译：如果装有压力液化气体（PLG）的压力容器遭受严重的火警，则油箱可能会破裂，甚至可能爆炸。已经表明，在这种事故的结果中，液相中存储的能量很重要。为了更好地理解储罐的故障和能量存储，期望在热致破裂之前理解提货的复杂的热-液压响应。在2000年和2001年夏天，在水平1890升（500美国加仑）丙烷罐上进行了一系列的受控燃烧试验。测试罐配有压力传感器，提单和壁热电偶，以及代替泄压阀（PRV）的流量喷嘴。使用计算机控制的PRV来控制压力，同时使用高动量的液态丙烷实用炬来加热储罐。在此测试系列中，PRV排污和着火条件发生了变化，而所有其他输入参数保持不变。结果发现，根据火灾情况和PRV操作，提速响应和能量存储会发生变化。燃烧器的位置和数量会影响液体中的热分层以及液体/蒸气界面处的膨胀和起泡。 PRV的排污影响了平均油箱压力，平均液体温度和消解时间。 PRV操作导致蒸气空间壁上的对流冷却增强。排污程度决定了压降，因此影响了液体闪蒸和随后的溶胀。本文将讨论这些热液反应及其在储罐故障中的作用。

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