Study on performance of serrated spiral finned tube banks under wet flue gas condition

doi:10.11949/j.issn.0438-1157.20190568

Abstract

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

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

CLC Number:

TK 124

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.

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.

Figures/Tables 11

Fig.1 Schematic diagram of experimental system

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

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

Fig.3 Schematic diagram of simulation model

Fig.4 Boundary condition of simulation model

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

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

Fig.7 Comparison between numerical simulation and experimental results

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

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

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

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