Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux

ZHU Bingguo; GONG Kaigang; YANG Xiaoliang; PENG Bin; YANG Baokun

doi:10.19666/j.rlfd.202212290

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Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux

Thermal Power Generation Vol. 52, Issue 6, Pages: 45-51(2023)

更新时间：2025-09-28

- Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux
- 作者机构：
  
  1. 兰州理工大学机电工程学院
  2. 兰州兰石石油装备工程股份有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202212290
  CLC： TM61;TK229.6
- Published：2023
- 稿件说明：
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ZHU Bingguo, GONG Kaigang, YANG Xiaoliang, et al. Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux[J]. Thermal Power Generation, 2023, 52(6): 45-51.
DOI：

ZHU Bingguo, GONG Kaigang, YANG Xiaoliang, et al. Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux[J]. Thermal Power Generation, 2023, 52(6): 45-51. DOI： 10.19666/j.rlfd.202212290.

摘要

针对超临界二氧化碳（S-CO_2）燃煤锅炉冷却壁热边界条件的实际分布，采用SST k-ω低雷诺数湍流模型，数值模拟研究了半周加热轴向非均匀热流作用下S-CO_2在垂直圆管内的传热特性，分析了不同热流分布、质量流速对换热性能以及圆管内壁温度分布的影响。研究结果表明：轴向非均匀热流分布对S-CO_2传热具有显著影响，在平均热流相同的条件下，相较于均匀热流分布，轴向非均匀热流分布下总传热系数最大提高了约8%；轴向非均匀热流分布对传热恶化有抑制作用，有效降低了壁温峰值点；非均匀热流条件下，S-CO_2传热主要受类气膜厚度、类气膜导热系数及近壁区定压比热容的影响较大。研究结果可为燃煤S-CO_2锅炉设计提供理论指导。

Abstract

In view of the actual distribution of heat boundary conditions on the cooling wall of supercritical carbon dioxide(S-CO_2) coal-fired boiler

the heat transfer characteristics of supercritical CO_2 in a vertical circular tube under axial non-uniform heat flux were numerically studied by using SST k-ω low Reynolds number turbulence model. The influence of different heat flux distribution

mass flux on heat transfer performance and wall temperature distribution was analyzed. The results show that the axial non-uniform heat flux distribution has a significant effect on the heat transfer of S-CO_2. Compared with the uniform heat flux

the total heat transfer coefficient under the axial non-uniform heat flux increases by about 8%. The non-uniform distribution of axial heat flux can inhibit the heat transfer deterioration and effectively reduce the peak wall temperature. Under the condition of non-uniform heat flux

the heat transfer of S-CO_2 is mainly affected by the thickness of the gas-like film

the thermal conductivity of the gas-like film and the specific heat near the wall. The results provide theoretical guidance for the design of supercritical CO_2 boiler.

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