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Steady Turbulent Gas Desorption in Surface Condenser Tubes

by Mahmood Naghash, Bechtel Corp, Gaithersburg, United States,
C. Samuel Martin, Bechtel Corp, Gaithersburg, United States,



Document Type: Proceeding Paper

Part of: Water Quality Issues at Fossil Fuel Plants

Abstract:

A one-dimensional steady two-phase separated flow model in conjunction with the energy and mass transfer equations and an associated turbulent mass transfer coefficient model are utilized to represent a numerical model. The heat transfer relation along the condenser tube is presented through the Log Mean Temperature Difference (LMTD) relation available for surface condensers. The set of mathematical relations are then integrated numerically in conjunction with the boundary conditions for different numerical test conditions. The numerical predictions are first compared against the available experimental data without heat addition. Then for actual surface condenser design data, the effect of a number of variables on the gas desorption rate including variation of temperature, degree of saturation, initial mass of free gas, and sensitivity to the mass transfer coefficient model multiplier are evaluated. From the analysis, it was found that while the turbulent mass transfer rate along the condenser tube increases moderately with the longitudinal increase of the temperature, its increase due to the higher values of initial mass of free gas and the initial degree of super-saturation, however, is more significant.

Subject Headings: Mass transfer | Desorption | Temperature effects | Numerical models | Mathematical models | Numerical methods | Heat transfer

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