Numerical simulation of convection condensation heat transfer of H-fixed tubes with wet flue gas

doi:10.11949/0438-1157.20190523

Abstract

Abstract:

The numerical simulation is used to simulate the convective condensation heat transfer characteristics of the fully developed section of the H-type and round fin-tube heat exchanger channels under wet conditions. The SIMPLER algorithm is used to calculate the pressure and velocity coupling. The wet flue gas flow rate ranges from 1 to 5 m/s, and the water vapor mass fraction ranges from 5% to 13%. The effects of different inlet velocity and water vapor mass fraction on heat and mass transfer coefficient, heat transfer, condensate flow rate and fin efficiency of H-shaped finned tube and circular finned tube were discussed. The calculation results show that the heat transfer capacity of H-type finned tube is obviously stronger than that of circular finned tube, but the condensation production is less than that of circular finned tube. Meanwhile, the total finned efficiency and latent heat finned efficiency of H-type finned tube are less than that of circular finned tube.

Key words: heat and mass transfer, fin efficiency, H-type finned tube, round finned tube, dehumidifying conditions

摘要：

通过数值计算对湿工况下的H型和圆型翅片管换热器通道内充分发展段的对流冷凝传热特性进行模拟研究。计算采用压力与速度耦合的SIMPLER算法，湿烟气流速范围为1~5 m/s，水蒸气质量分数范围为5%~13%。讨论了不同入口速度、水蒸气质量分数对H型翅片管和圆型翅片管传热传质系数、传热量、冷凝水流量和翅片效率的影响，并进行定量比较分析。计算结果表明，H型翅片管的传热能力强于圆型翅片管，但冷凝生成量较圆型翅片管小，同时H型翅片管的总翅片效率和潜热翅片效率小于圆型翅片管。

关键词: 传热传质, 翅片效率, H型翅片, 圆型翅片, 湿工况

CLC Number:

TQ 028.8

Yang HE, Limin WANG, Chunli TANG, Defu CHE. Numerical simulation of convection condensation heat transfer of H-fixed tubes with wet flue gas[J]. CIESC Journal, 2019, 70(12): 4556-4564.

何洋, 王利民, 唐春丽, 车得福. H型翅片管湿烟气对流冷凝传热的数值模拟研究[J]. 化工学报, 2019, 70(12): 4556-4564.

Figures/Tables 12

Fig.1 Denitrification schematic diagram of mass flow rate of water vapor condensation near wall surface

Fig.2 Schematic diagram of periodic boundary conditions

Fig.3 Comparison of experimental and simulated values

Fig.4 Finned geometry and calculation area

Table 1 Finned tube geometry dimensions and inlet parameters

参数	H型翅片	圆型翅片
管外径D/ mm	38	38
管壁厚度t/ mm	3	3
翅片厚度δ/ mm	3	3
翅片节距F _P/ mm	14.5	14.5
翅片高度h/ mm	—	13.26
翅片长度H/ mm	89	—
翅片宽度W/ mm	95	—
翅片间隙G/ mm	8	—
纵向管间距P ₁/ mm	180	180
横向管间距P ₂/ mm	120	120
入口温度T _in/ K	370	370
管壁温度T _tube/ K	300	300
入口速度v _in/(m·s^-1)	1~5	1~5
入口水蒸气质量分数ω/ %	5~13	5~13

Fig.5 Temperature distribution of fluid and water vapor mass fraction distribution

Fig.6 Relation curve of heat transfer rate with velocity and water vapor mass fraction

Fig.7 Relation curve of heat and mass transfer coefficient with velocity and water vapor mass fraction

Fig.8 Weighted average temperature and temperature distribution of fin surface area

Fig.9 Relation curve of condensation production with velocity and water vapor mass fraction

Fig.10 Wet fin area ratio and condensation generation rate

Fig.11 Relation curve of fin efficiency with velocity and water vapor mass fraction

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