Heat transfer and flow characteristics of new phase change heat transfer system
A large amount of low temperature heat is generated in the aromatic complex.The low temperature residual heat from the top gas of the extraction tower and the extraction tower is often not recovered effectively due to the leakage of the heating medium.Taking the extraction tower of aromatics unit as the research object,a design scheme of waste heat recovery using intermediate medium phase conversion heat to ensure the intrinsic safety of the process was proposed,and a small experimental device of 10 kW phase conversion thermal system was built to study the start-up performance and thermal performance of the phase conversion thermal system.The experimental results show that with the increase of liquid filling rate,the heat transfer efficiency of the system increases first and then decreases,and the optimal liquid filling rate is 90％.With the increase of heating power,the startup time of the system decreases,but the rate of reduction is decreasing.When the cooling water flow rate and inlet temperature are constant,the working temperature of the system working medium,the circulating flow rate of the system working medium and the liquid level height increase synchronously with the increase of heating power.When the inlet temperature and heating power of the cooling water are constant,the working temperature of the system working medium decreases with the increase of the cooling water flow,but the circulating flow rate of the working medium and the liquid level of the downcomer gradually increase.
aromatic hydrocarbon low-temperature heatphase transformation heatheat transfer characteristic
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