Effect of Structural Parameters of Integral Spiral Finned Tube Bundles on Heat Transfer Characteristics

doi:10.12068/j.issn.1005-3026.2026.20240130

Abstract

Abstract:

To investigate the influence of structural parameters on the heat transfer characteristics between integral spiral finned tube bundles， 13 groups of such tube bundles with varying structural parameters were designed and fabricated. A 1∶1 experimental bench for heat transfer characteristics was established to conduct experimental research on the heat transfer characteristics of these tube bundles. The findings indicate that the Nusselt number （Nu） on the gas side of the tube bundles improves with an increase in flue gas velocity， fin height， fin pitch， and longitudinal pitch within the production’s adjustable range. Conversely， the transverse pitch does not significantly affect the Nu on the gas side of the tube bundles. Based on the experimental data， a correlation equation describing the Nu on the gas side of the integral spiral finned tube bundles is proposed， providing a theoretical foundation for subsequent research on the optimization of numerical calculations of the thermal parameters of these tube bundles.

Key words: heat recovery steam generator, economizer, integral spiral finned tube bundle, heat transfer characteristic

CLC Number:

TK 223

Dan-feng ZHANG, Hui DONG, Liang ZHAO. Effect of Structural Parameters of Integral Spiral Finned Tube Bundles on Heat Transfer Characteristics[J]. Journal of Northeastern University(Natural Science), 2026, 47(1): 131-137.

Figures/Tables 11

Fig.2 Physical diagram of experimental system

Fig.3 Schematic diagram of integral spiral finned tube bundle structure

Fig.4 Heat transfer balance between flue gas side and water side

Fig.5 Influence of fin height on Nu on gas side of tube bundles

Fig.6 Influence of fin pitch on Nu on gas side of tube bundles

Fig.7 Influence of transverse pitch on Nu on gas side of tube bundles

Fig.8 Influence of longitudinal pitch on Nu on gas side of tube bundles

Fig.9 Comparison of experimental values and calculated values by correlation equation

Fig.10 Histogram and normal distribution curve of relative errors between experimental values and calculated values by correlation equation

Table 1 Structural parameters of integral spiral

方案	翅片管参数/mm				管束布置参数/mm
方案	内径	外径	翅片间距	翅片高度	纵向管距	横向管距
1	32	38	5	12.8	104	89
2	32	38	11	12.8	104	89
3	32	38	14	12.8	104	89
4	32	38	8	12.8	104	89
5	32	38	8	7.0	104	89
6	32	38	8	10.0	104	89
7	32	38	8	16.0	104	89
8	32	38	8	12.8	104	59
9	32	38	8	12.8	104	74
10	32	38	8	12.8	104	104
11	32	38	8	12.8	59	89
12	32	38	8	12.8	74	89
13	32	38	8	12.8	89	89

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