Modeling and analysis of heat transfer in submerged combustion vaporizer under supercritical pressure

Abstract

Submerged combustion vaporizer (SCV) is widely used as a device to vaporize liquefied natural gas (LNG) stored in cryogenic state, which is effective in peak shaving and emergency response in LNG vaporization stations and receiving terminals. In this paper, a heat transfer calculation model of SCV based on numerical calculation is established and its accuracy is verified by a practical case. Based on this model, the applicability of different heat transfer models inside tube to SCV heat transfer is studied, among which the deviation of Petukhov model is the smallest, which is 0.38%. The increase of gas holdup and fouling thermal resistance inhibits the heat transfer to some extent, so it is necessary to increase the water bath temperature to make up for the lack of heat transfer coefficient under high relative load. In terms of agitating the water bath more fully and reducing the gas holdup inside overflow weir, the effect of 0.090 flue gas tube opening ratio is better than 0.022. The application of this calculation model can provide theoretical reference for heat transfer analysis and optimal design of SCV.