有机热载体热稳定性测定法的修订

有机热载体广泛应用于多个行业的加热系统。热稳定性是其最重要的性能指标，能够反映油品在高温下发生分解及聚合的倾向。以DIN 51528-1998《未使用过的热传导液热稳定性测定法》作为参考标准，对SH/T 0680-1999《热传导液热稳定性测定法》进行修订，建立GB/T 23800-2009《有机热载体热稳定性测定法》，该标准要求使用毛细管色谱柱、报告终馏点为538 ℃以前的馏分沸程结果、保证仪器温度均匀分布、试验时间不少于720 h。修订后的标准方法能够更加准确反映不同类型有机热载体在不同温度和加热时间下的热稳定性能。

REVISION AND STANDARD METHOD FOR TESTING THERMAL STABILITY OF ORGANIC HEAT TRANSFER FLUID

Organic heat transfer fluid has been applied for heating system in various industries. Thermal stability is an important performance, which is an indication of decomposition and polymerization of oil at high temperature. SH/T 0680-1999《Heat Transfer Fluids-Determination of thermal Stability》was revised, taking standard DIN 51528-1998《Unused Heat Transfer Fluids-Determination of thermal Stability》as a reference. The differences are that the revised method requires to use capillary chromatographic column in gas chromatograph analysis, report the boiling range of sample before end point of 538℃, uniform the temperature distribution in whole equipment, and change the test time. The standard revised can reflect better thermal stability of different kinds of organic heat transfer fluids at different temperature and different heating time.