Numerical simulation on heat transfer deterioration of supercritical carbon dioxide in vertical tube

被引：0

作者：

Wang S. ^{[1
]}

Li Z. ^{[1
]}

Shao Y. ^{[1
]}

Zhong W. ^{[1
]}

机构：

[1] Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing

来源：

Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 03期

关键词：

Correlations; Flow; Heat transfer deterioration; Supercritical carbon dioxide; Vertical tubes;

D O I：

10.11949/0438-1157.20211399

中图分类号：

学科分类号：

摘要：

In the supercritical carbon dioxide(S-CO2) Brayton cycle coal-fired power generation system, the deterioration of S-CO2 heat transfer in the water wall tube in the furnace is of great significance to the design, construction and safe operation of the system. Numerical simulation study of heat transfer for S-CO2 flowing in vertical tubes is carried out in the present paper. The effect of operating parameters including pressure, mass flow, heat flux and tube diameter, as well as buoyancy and flow acceleration caused by changes in physical properties of S-CO2 on the wall temperature and convective heat transfer coefficient is analyzed. It is shown that increasing the pressure and mass flow rate can reduce the degree of heat transfer deterioration, while increasing the heat flux density and pipe diameter will aggravate the degree of heat transfer deterioration. In addition, there is an obvious buoyancy effect which will cause heat transfer deterioration, while the influence of flow acceleration on heat transfer can be ignored under the working conditions studied in this paper. A new critical heat flux correlation is proposed using a deep neural network (DNN) method under wide working conditions of the diameter 4-10 mm, pressure 11.07-22.14 MPa, mass flux 0-1200 kg/(m2·s) and heat flux 0-200 kW/m2, of which the prediction accuracy can be improved to 94.96%. © 2022, Editorial Board of CIESC Journal. All right reserved.

引用

页码：1072 / 1082

页数：10

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