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Numerical simulation of flow and heat transfer between supercritical CO 2 tube and flue gas
Author(s) -
Wang Jimin,
Dong Feilong,
Chen Xue,
Gu Mingyan,
Chu Huaqiang
Publication year - 2019
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2295
Subject(s) - supercritical fluid , brayton cycle , flue gas , heat transfer , rankine cycle , boiler (water heating) , degree rankine , thermodynamics , thermal , supercritical flow , mechanics , nuclear engineering , materials science , chemistry , heat exchanger , waste management , engineering , physics , power (physics)
To further improve the thermal efficiency of the coal‐fired boiler, lower environment restraints, and minimize key components, the supercritical CO 2 Brayton cycle was considered to replace the conventional steam Rankine cycle. In this paper, a three‐dimensional mathematical model of the thermal behaviors between the supercritical CO 2 tube and flue gas was established using the Lam–Bremhorst k – ε model, the gas real model, and the P‐1 radiation model. The distributions of the velocity and the temperature between the supercritical CO 2 tube and flue gas were investigated numerically. Furthermore, the effects of the supercritical CO 2 inlet temperature on the thermal behaviors were also examined. The results show the surface heat transfer coefficient goes up with the supercritical CO 2 inlet temperature due to the rise of the thermal conductivity. More significant thermal behaviors and detailed physical explanations were elaborated, which would offer a novel insight to understand, design, and optimize the supercritical CO 2 Brayton cycle for engineering applications.