Heat transfer model of two-phase flow across tube bundle in submerged combustion vaporizer

摘要

In order to optimize the design of the submerged combustion vaporizer (SCV), an experimental apparatus was set up to investigate the heat transfer character outside the tube bundle in SCV. Several experiments were con-ducted using water and CO2 as the heat transfer media in the tubes, respectively. The results indicated that hot air flux, the initial liquid level height and the tube pitch ratio had great influence on the heat transfer coefficient outside the tube bundle (ho). Finally, the air flux associated factor β and height associated factor γ were intro-duced to propose a new ho correlation. After verified by experiments using cold water, high pressure CO2 and liq-uid N2 as heat transfer media, respectively, it was found that the biggest deviation between the predicted and the experimental values was less than 25%.