印刷电路板式换热器内超临界甲烷流动换热特性模拟

doi:10.11949/0438-1157.20201537

摘要/Abstract

摘要：

印刷电路板式换热器（printed circuit heat exchanger，PCHE）作为一种新型高效微通道换热器，将其应用在LNG浮式储存与气化装置（FSRU）上具有非常大的潜力。对超临界甲烷在PCHE通道中的流动和传热特性进行了数值模拟，结果表明：传热系数随温度先增大后减小，并在准临界温度（202～212 K）处达到峰值；压降随温度先保持不变，然后在准临界温度附近急剧上升，之后随温度增大的趋势变缓；当温度在准临界温度附近时，低质流密度下增大热通量会恶化传热；不同压力下传热系数均在准临界温度处达到峰值；温度低于准临界温度时，压力对压降的影响可以忽略，温度高于准临界温度时，压降随压力增大而显著降低；压力由6.4M Pa提高到8.5 MPa时，传热最大降低32.5%，压降最大降低28.5%；开发的换热和压降关联式平均误差分别为5.6%和4.2%。

关键词: 超临界甲烷, 印刷电路板式换热器, 准临界温度, 数值模拟, 流动, 传热

Abstract:

As a new type of high-efficiency micro-channel heat exchanger, printed circuit heat exchanger (PCHE) has great potential for its application in floating LNG storage and gasification unit (FSRU). The flow and heat transfer characteristics of supercritical methane in the PCHE channel were simulated. The simulation results show that the heat transfer coefficient first increases and then decreases with temperature, and reaches a peak near the pseudocritical temperature (202—212 K). The pressure drop first remains unchanged with the temperature, then rises sharply near the pseudocritical temperature, and then increases with the temperature. When the temperature is near the pseudocritical temperature, increasing the heat flux under low mass flux density will deteriorate heat transfer coefficient. The heat transfer coefficients under different pressures all reach the peak at the pseudocritical temperature under each pressure. When the temperature is lower than the pseudocritical temperature, the influence of pressure on the pressure drop is negligible, and when the temperature is higher than the pseudocritical temperature, the pressure drop increases with the pressure. When the pressure is increased from 6.4 MPa to 8.5 MPa, the heat transfer coefficient is reduced by 32.5% and the pressure drop is reduced by 28.5%. The average errors of the developed heat transfer and pressure drop correlation equations are 5.6% and 4.2%, respectively.

Key words: supercritical methane, printed circuit heat exchanger, pseudocritical temperature, numerical simulation, flow, heat transfer

中图分类号:

TB 657

谢瑶, 李剑锐, 胡海涛. 印刷电路板式换热器内超临界甲烷流动换热特性模拟[J]. 化工学报, 2021, 72(S1): 203-209.

XIE Yao, LI Jianrui, HU Haitao. Simulation of supercritical methane flow and heat transfer characteristics in printed circuit heat exchanger[J]. CIESC Journal, 2021, 72(S1): 203-209.

图/表 13

图1 印刷电路板式换热器Z形半圆形通道

Fig.1 Schematic diagram of Z-type semicircle channel for printed circuit heat exchanger

图2 网格无关性验证结果

Fig.2 Results of grid independence verification

图3 模拟结果与试验结果的误差对比

Fig.3 Error comparison between simulation results and experimental results

图4 质流密度对传热系数的影响

Fig.4 Effect of mass flux density on heat transfer coefficient

图5 甲烷的比热容随温度变化曲线

Fig.5 Curves of specific heat capacity of methane varying with temperature

图6 质流密度对压降的影响

Fig.6 Effect of mass flow density on pressure drop

图7 甲烷的黏度和密度随温度变化曲线

Fig.7 Curves of viscosity and density of methane varying with temperature

图8 热通量对传热系数的影响

Fig.8 Effect of heat flux on heat transfer coefficient

图9 热通量对压降的影响

Fig.9 Effect of heat flux on pressure drop

图10 压力对传热系数的影响

Fig.10 Effect of pressure on heat transfer coefficient

图11 压力对压降的影响

Fig.11 Effect of pressure on pressure drop

图12 新换热关联式的预测结果

Fig.12 Prediction results of new developed heat transfer correlation

图13 新压降关联式的预测结果

Fig.13 Prediction results of new developed pressure drop correlation

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