Abstract
For insuring the safe operation of LNG heat exchanger in the Emergency Stop Operation Process (ESOP), a numerical method is proposed to investigate the stress of Plate-Fin Structures (PFS) in that. The relationship between stress of PFS and ESOP is analyzed in LNG heat exchanger. The results will be obtained that the maximum equivalent stress of PFS is greater at the initial stage of ESOP than that at the last stage when the HMR pressure is more than 5 MPa. The maximum equivalent stress increases with the equilibrium temperature when is greater than 180 K and reaches peak value at the last stage of ESOP. The maximum equivalent stress is larger at the last stage of ESOP than the other stage and increases with the equilibrium pressure. When the temperature difference is more than 5 K in the ESOP, the influence of that is obvious for the stress of PFS. In the ESOP, the equilibrium temperature and temperature difference should be controlled within 240 K and 5 K, respectively.
Highlights
The Plate-Fin Structures (PFS) are a key component of heat exchanger in the Liquid Natural Gas (LNG) plants [1, 2]
In the LNG heat exchanger, the LMR will be heated by the heat flux which comes from the NG or HMR and becomes from liquid phase to vapor phase
The some conclusions can be obtained by this study: 1. In initial stage of Emergency Stop Operation Process (ESOP), the maximum equivalent stress of PFS is obviously influenced by the HMR
Summary
The Plate-Fin Structures (PFS) are a key component of heat exchanger in the Liquid Natural Gas (LNG) plants [1, 2]. The relationship between stress of PFS and ESOP in LNG heat exchanger was analyzed by the finite element method. In order to relieve the stress concentration and structural failure of PFS, the ESOP must be performed for heat exchanger in large LNG plant. The influences of LMR and HMR operation parameters for stress characteristics of PFS are analyzed in the ESOP of LNG heat exchanger. For HMR and LMR in LNG heat exchanger, the pressure of HMR decreases and that of LMR increases with the operation time if the throttle value is not shut in the ESOP. By the heat transfer in crosswise direction of LNG heat exchanger, the temperature of HMR and LMR increases as the operation time increases in the ESOP. The relationship between stress of PFS and ESOP is analyzed in the ESOP based on the above assumptions
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