Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 35, Issue 7, Pages 1427-1434Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2011.06.001
Keywords
High-pressure gas; Membrane helical coil; Membrane serpentine tube; Convective heat transfer
Funding
- Natural Science Fund of China [50806058]
- Natural Science Fund of Shaanxi Province [SJ08E213]
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Since the heat transfer performance of syngas cooler affects the efficiency of the power generating system with integrated coal gasification combined cycle (IGCC) directly, it is important to obtain the heat transfer characteristics of high-pressure syngas in the cooler. Heat transfer in convection cooling section of pressurized coal gasifier with the membrane helical coils and membrane serpentine tubes under high pressure is experimentally investigated. High pressure single gas (He or N-2) and their mixture (He + N-2) gas serve as the test media in the test pressure range from 0.5 MPa to 3.0 MPa. The results show that the convection heat transfer coefficient of high pressure gas is influenced by the working pressure, gas composition and symmetry of flow around the coil, of which the working pressure is the most significant factor. The average convection heat transfer coefficients for various gases in heat exchangers are systematically analyzed, and the correlations between Nu and Re for two kinds of membrane heat exchangers are obtained. The heat transfer coefficient of heat exchanger with membrane helical coils is greater than that of the membrane serpentine-tube heat exchanger under the same conditions. The heat transfer coefficient increment of the membrane helical-coil heat exchanger is greater than that of the membrane serpentine-tube heat exchanger with the increase of gas pressure and velocity. (C) 2011 Elsevier Inc. All rights reserved.
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