天然气加热炉内介质水非稳态耦合热流场研究

设计制造高效节能的加热气化设备是油气工业中迫切需要解决的问题。本文深入研究天然气加热炉传热机理，开创性地构建了大空间非稳态自然对流及介质参与性辐射耦合传热模型，求解水作为中间载热介质的天然气加热炉内非稳态耦合热流场，并通过天然气加热、传热流动试验平台，对边界条件进行试验校准并验证了数值分析模型的正确性。结果显示，加热炉内流场不均，整体循环不佳，加热炉的启动时间为2.5 h，加热效率仅为83.5%，介质参与性辐射占总传热量的24.5%。显然，传统加热炉结构有待优化，且介质参与性辐射影响不可忽略。

Unsteady coupled heat flow field of medium water in natural gas heater

The design and manufacture of high efficiency and energy-saving heating and gasification equipment is an urgent problem to be solved in the oil and gas industry. In-depth research has been carried on the heat transfer mechanism inside the heaters. A combined natural convection and participating medium radiation heat transfer model in the large cylinder was built in a creative way, to solve the unsteady-state coupled heat flow field in the gas heater with water as the heat transfer medium, and the boundary conditions and numerical model were validated through the gas heating and heat transfer flow test platform. The results show that the flow field in the heater is uneven and the overall circulation is poor. The starting time of the heater is 2.5h, the heating efficiency is only 83.5%, and the medium participatory radiation accounts for 24.5% of the total heat transfer. Obviously, the structure of traditional heater needs to be optimized, and the influence of medium participatory radiation can not be ignored.