Influence of slag-seed interaction on MHD generator performance

Conference · Wed Feb 01 04:00:00 EST 1984 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:6620972

Luongo, C A; Kruger, C M

An overview of past work in the field of slag/seed interaction is presented. The ideal solution model for the slag and its failure to lead to accurate predictions are discussed. The non-ideal solution model is introduced. Data on potassium vapor pressure over slags taken at the National Bureau of Standards and Montana State University were compiled and compared. Large disagreement between these sources was observed. The shortcomings of the complete thermodynamic equilibrium models led to over predictions in the fraction of seed lost to the slag. A model including non-equilibrium effects is introduced. The heat/mass transfer analogy is invoked to calculate the mass transfer rate of potassium towards the slag. Using typical conditions for a large MHD generator, an integral method is used to evaluate the potassium concentration boundary layer thickness. The calculations are performed with the slag runoff (ash rejection) as a parameter. The increase in boundary layer resistance due to potassium depletion is calculated.

• Research Organization: Stanford Univ., Stanford, CA
• OSTI ID: 6620972
• Report Number(s): CONF-840201-
• Conference Information: Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Journal Volume: 84-AES-4
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300104* -- MHD Generators-- Duct Engineering & Fluid Dynamics
ALKALI METALS
BOUNDARY LAYERS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
COMPRESSED GASES
CORROSION RESISTANCE
DIRECT ENERGY CONVERTERS
ELEMENTS
ENERGY TRANSFER
FLUIDS
FOULING
GASES
HEAT TRANSFER
KINETICS
LAYERS
MASS TRANSFER
MATHEMATICAL MODELS
METALS
MHD CHANNELS
MHD GENERATORS
PERFORMANCE
POTASSIUM
PRESSURE EFFECTS
REACTION KINETICS
SEED-SLAG INTERACTIONS
SLAGS
THERMODYNAMICS
VAPORS