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THREE-DIMENSIONAL ANALYSIS OF LARGE SHELL-AND-TUBE HEAT EXCHANGERS AT HIGH TEMPERATURES

DOI: 10.1615/ICHMT.2008.CHT.1980
19 pages

Masato Handa
Hitachi, Ltd., Hitachi Research Laboratory, 832-2 Horiguchi, Hitachinaka-shi, Ibaraki-ken 312-0034, Japan

Kenji Yamamoto
Hitachi, Ltd., Hitachi Research Laboratory, 832-2 Horiguchi, Hitachinaka-shi, Ibaraki-ken 312-0034, Japan

Akihiro Yamada
Hitachi, Ltd. Power & Industrial Systems R&D Laboratory, 832-2 Horiguchi, Hitachinaka-shi, Ibaraki-ken, 312-8507 Japan

Keiichiro Yamamoto
Babcock-Hitachi, K. K. Kure Division, 6-9 Takara-machi, Kure-shi, Hiroshima-ken, 737-8508 Japan

Yoshio Shimogori
Babcock-Hitachi, K. K. Kure Division, 6-9 Takara-machi, Kure-shi, Hiroshima-ken, 737-8508 Japan

Abstrakt

We developed a numerical method for the shell-and-tube type of large scale heat exchangers under high temperature circumstances which enables us to obtain three-dimensional information (the heat flux and temperature distributions of each tube) in a practical time and does not require large computer resources such as parallel computers. To get significant reduction in computational power and time, we adopt a system of coarse computational cells for the shell side, which may contain several tubes, and divide the tubes therein into small straight pipes independently of the division for the shell side. To maintain computational accuracy, we model the flow resistance and convective heat transfer owing to the tubes contained in the cell using empirical formulae of flows past a tube bundle. Radiation, which is an important mode of heat transfer under high temperature circumstances, is computed by the discrete transfer method. To implement the discrete transfer method properly, a new algorithm of ray tracing for the system of the cells containing the tubes is developed. As an example application of the numerical method, we take the whole heat recovery area in a coal fired boiler and compare the simulated results obtained by using the method with the measured temperatures of the heat exchanger in the actual boiler. The simulation is completed in 6 hours by using only one node of a PC cluster and its results are in good agreement with the measured data.

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