Analysis of factors influencing packing temperature in cryogenic test of shut-off valves for LNG
To ensure the safety and reliability of the liquefied natural gas(LNG)system,ultra-low temperature shut-off valves must have excellent low-temperature resistance under extreme working conditions(-196 ℃).A temperature field experiment is conducted on the ultra-low temperature shut-off valve DN15,collecting temperature data from the packing gland of 235 ultra-low temperature shut-off valves.After processing,the temperature field is verified for normal distribution.The results show that the temperature field of the packing part conforms to the normal distribution law.The factors that may affect the temperature in the experiment are parameterized,and the temperature at the packing gland part is calculated under the influence of three parameters:convective heat transfer coefficient,nitrogen layer height,and nitrogen layer temperature.A probability distribution map of the packing temperature is also generated.
LNG shut-off valveultra-low temperature experimentpacking temperatureparametric analysisnitrogen
NETL
NSTL
万方数据
