TY - JOUR
T1 - Convective heat transfer characteristics of high-pressure gas in heat exchanger with membrane helical coils and membrane serpentine tubes
AU - Yang, Zhen
AU - Zhao, Zhenxing
AU - Liu, Yinhe
AU - Chang, Yongqiang
AU - Cao, Zidong
PY - 2011/10
Y1 - 2011/10
N2 - 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 N2) and their mixture (He+N2) gas serve as the test media in the test pressure range from 0.5MPa to 3.0MPa. 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.
AB - 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 N2) and their mixture (He+N2) gas serve as the test media in the test pressure range from 0.5MPa to 3.0MPa. 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.
KW - Convective heat transfer
KW - High-pressure gas
KW - Membrane helical coil
KW - Membrane serpentine tube
UR - https://www.scopus.com/pages/publications/79961010745
U2 - 10.1016/j.expthermflusci.2011.06.001
DO - 10.1016/j.expthermflusci.2011.06.001
M3 - 文章
AN - SCOPUS:79961010745
SN - 0894-1777
VL - 35
SP - 1427
EP - 1434
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
IS - 7
ER -