Predicting heat transfer performance in a complex heat exchanger for LNG FGSS development

Abstract

In this study, a reasonable design option for improving the thermal performance of a newly designed complex heat exchanger that can simultaneously heat LNG) and BOG) is analyzed and evaluated. The relative heat transfer rates are compared according to the changes in the steam supply method, and the flow characteristics, heat transfer rate, and internal pressure of the steam inside the shell of the complex heat exchanger are interpreted using computational fluid analysis. Without distribution plates, the heat transfer rate to LNG increases as the steam supply inlet in the complex heat exchanger increases. However, if distribution plates are present, then the heat transfer rate decreases. It is discovered that there is a significant difference in the heat transfer rates for BOG depending on the presence or absence of distribution plates, and the impact of the steam supply inlet is almost negligible. These results confirm that selecting an appropriate combination based on the design conditions is necessary for the optimal design of a complex heat exchanger.