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.

潜水燃烧气化器（SCV）广泛用作蒸发以低温状态存储的液化天然气（LNG）的装置，这对LNG气化站和接收站的削峰和紧急响应有效。本文建立了基于数值计算的SCV传热计算模型，并通过实例验证了其准确性。在此模型的基础上，研究了管内不同传热模型对SCV传热的适用性，其中Petukhov模型的偏差最小，为0.38％。气体滞留量和结垢热阻的增加在一定程度上抑制了热传递，因此有必要提高水浴温度以弥补高相对载荷下缺乏热传递系数的问题。在充分搅动水浴和减少溢流堰内的气体滞留方面，0.090烟气管开口率的效果优于0.022。该计算模型的应用可以为SCV的传热分析和优化设计提供理论参考。