湿烟气工况下齿形螺旋翅片管束的性能研究

doi:10.11949/j.issn.0438-1157.20190568

摘要/Abstract

摘要：

换热器烟气侧自身结构参数和外界条件是影响换热器换热及阻力特性的主要因素，采用数值模拟和实验方法研究了翅片螺距及烟气含水量对齿形螺旋翅片管束换热及阻力特性的影响。结果表明，在翅片螺距3.63～8.47 mm范围内，烟气侧 Nu随着翅片螺距的增大而增大，在不同入口烟温下，相对于3.63 mm翅片管，5.08 mm和8.47 mm翅片管 Nu分别增大3%~6%和9%~14%， Eu随着翅片螺距的增大而减小，相对于3.63 mm翅片管，5.08 mm和8.47 mm翅片管 Eu分别减小30%和50%左右；烟气含水量的适当增大，有利于提高齿形翅片管束的换热及阻力特性。

关键词: 传热, 翅片螺距, 烟气含水量, 换热特性, 阻力特性, 数值模拟, 优化

Abstract:

The effect of fin arrangements and operating conditions has significance for the flue gas side performance characteristics of finned tube heat exchangers. The effects of fin pitches and water vapor content on the flow resistance and heat transfer characteristics of serrated spiral finned tube banks were investigated by using numerical simulation and experimental method. The results showed that the Nusselt number Nu increases with the increase of fin pitch when fin pitch ranges from 3.63 mm to 8.47 mm. Under different inlet flue gas temperatures, the Nu of 5.08 mm and 8.47 mm are higher than that for 3.63 mm by about 3%—6% and 9%—14%, respectively, while the Euler number Eu decreases with the increase of fin pitch, when fin pitch increases from 3.63 mm to 8.47 mm, Eu decreases by about 30% (for 5.08 mm) and 50% (for 8.47 mm). Appropriate increase of moisture content of flue gas is beneficial to improve heat transfer and resistance characteristics of toothed finned tube bundles.

Key words: heat transfer, fin pitch, water vapor content, heat transfer characteristics, flow resistance characteristics, numerical simulation, optimization

中图分类号:

TK 124

刘丹, 成毅, 胡明月, 盛倩云, 周昊. 湿烟气工况下齿形螺旋翅片管束的性能研究[J]. 化工学报, 2020, 71(2): 575-583.

Dan LIU, Yi CHENG, Mingyue HU, Qianyun SHENG, Hao ZHOU. Study on performance of serrated spiral finned tube banks under wet flue gas condition[J]. CIESC Journal, 2020, 71(2): 575-583.

图/表 11

图1 实验系统

Fig.1 Schematic diagram of experimental system

图2 齿形翅片管结构及管束排布

Fig.2 Structure of serrated spiral finned tube and arrangement of tube banks

表1 翅片管束几何参数

Table 1 Structural parameters of serrated spiral finned tube

No.	d_o/mm	d_i/mm	h_f/mm	δ_f/mm	p_f/mm	h_s/mm	w_s/mm
1	38	32	15.9	1	8.47	10.9	4
2	38	32	15.9	1	5.08	10.9	4
3	38	32	15.9	1	3.63	10.9	4

图3 建模示意图

Fig.3 Schematic diagram of simulation model

图4 边界条件设置

Fig.4 Boundary condition of simulation model

图5 翅片螺距对齿形翅片管束烟气侧换热特性的影响

Fig.5 Effect of fin pitch on heat transfer characteristics of serrated finned tube banks

图6 翅片螺距对齿形翅片管束烟气侧 Eu的影响

Fig.6 Effect of fin pitch on Eu of serrated finned tube banks

图7 模拟与实验结果比较

Fig.7 Comparison between numerical simulation and experimental results

图8 烟气含水量对不同螺距齿形翅片管束烟气侧 Nu的影响

Fig.8 Effect of water vapor content on Nu of serrated finned tube banks with different fin pitches

图9 烟气含水量对烟气物性的影响(250℃)

Fig.9 Effect of water vapor content on flue gas properties ( Pr, ρg, μ, ν)

图10 烟气含水量对齿形翅片管束烟气侧 Eu的影响

Fig.10 Effect of water vapor content on Eu of serrated finned tube banks with different fin pitches

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