Study on heat transfer enhancement of wire coil insert in tube of LNG vaporizer
A flow and heat transfer model in the tube of an LNG vaporizer is established to in-vestigate the characteristics of LNG heat exchange with steam.The results show that the applica-tion of a plane tube will result in in-tube film boiling,which cannot ensure the vaporization of LNG due to the excessive heat transfer temperature difference.It is proposed to add a wire coil in-sert in the heat exchanger tube to inhibit film boiling,the heat transfer performance of which can be improved up to 77.1％.The outlet temperature of the tube can be up to 230.1 K,which can satisfy the technical specifications of the LNG vaporizer.The size effect of of wire coil insert is al-so analyzed.Increasing the wire diameter from 1 mm to 1.4 mm improves the heat transfer effi-ciency without increasing the pressure drop,while increasing the pitch from 10 mm to 15 mm re-sults in deterioration of the flow and heat transfer performance.
万方数据
维普
