The Experimental Investigation on Flow and Heat Transfer Characteristics of the Rifled Water Wall Tube of an Ultra-supercritical CFB Boiler

被引：0

作者：

Wang W. ^{[1
]}

Li Y. ^{[1
]}

Zhao Y. ^{[1
]}

Qu M. ^{[1
]}

Yang D. ^{[1
]}

Ling W. ^{[2
]}

机构：

[1] State Key Laboratory of Multiphase Flow in Power Engineering (Xi'an Jiaotong University), Xi'an, 710049, Shaanxi Province

[2] Shenhua Group Co. Ltd., Dongcheng District, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2018年 / 38卷 / 02期

关键词：

Circulating fluidized bed (CFB) boiler; Heat transfer characteristics; Resistance characteristics; Rifled tube; Ultra-supercritical;

D O I：

10.13334/j.0258-8013.pcsee.171362

中图分类号：

学科分类号：

摘要：

Under the condition of low heat flux and mass flux, an experimental investigation on flow and heat transfer characteristics of an ultra-supercritical circulating fluidized bed (CFB) boiler water wall tube had been conducted. The material of the six-head rifled tube used in the test was 15GrMoG. The diameter and wall thickness was φ35mm × 5.67mm. The range of pressure was from 23MPa to 32MPa, mass flux was from 600kg/(m2·s) to 1200kg/(m2·s), and heat flux was from 200kW/m2 to 510kW/m2. In this paper, the wall temperature distribution obtained in the test had been exhibited. The empirical correlations of heat transfer coefficient and frictional resistance coefficient were derived. Six heat transfer coefficient correlations evaluated against the test data. The mechanism of heat transfer enhancement and heat transfer deterioration were analyzed. The results show that the effects of pressure and heat flux on wall temperature are significant within the region of high enthalpy (enthalpy > 2400kJ/kg). When the mass flux increases, the heat transfer deterioration of the tube will be delayed. The effect of buoyancy is significant when the temperature is less than the pseudo-critical temperature. The effects of the heat flux and pressure on frictional pressure drop are more dominant in the supercritical pressure regions. © 2018 Chin. Soc. for Elec. Eng.

引用

页码：373 / 382

页数：9

共 24 条

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