Mass spectrometric studies of MHD slag thermochemistry

Technical Report · Mon Jun 01 04:00:00 EDT 1981

OSTI ID:5895217

Hastie, J W; Plante, E R

The economic viability of open cycle coal-fired magnetohydrodynamics (MHD) is closely linked to the thermodynamic conditions of seed potassium, both in the plasma and slag phase. Previous attempts to model plasma conductivity and slag retention of seed have been highly inaccurate due to the limited thermodynamic data base available. These limitations have mainly included vapor pressure, enthalpy of formation, and solution activity data for slag phases. Results of an extensive systematic experimental program of measurements on these and related properties are presented. The following potassium-containing systems were studied: binary mixtures of K/sub 2/O with SiO/sub 2/, Al/sub 2/O/sub 3/, Fe/sub 2/O/sub 3/, and ZrO/sub 2/; a series of more complex synthetic slags containing K/sub 2/O, SiO/sub 2/, CaO, MgO, Al/sub 2/O/sub 3/, and Fe/sub 2/O/sub 3/; and MHD channel slag (Illinois No. 6 coal); and several slag-NaCl mixtures. Data were obtained over a sufficiently wide range of component-type, composition and temperature to reveal systematic trends in slag activities from which empirical predictions are possible. However, anomalous behavior was also noted, mainly in the form of nonequilibrium effects. Application of the vaporization and activity data to plasma-slag interaction and to the recovery of potassium seed from slag is also considered.

• Research Organization: National Bureau of Standards, Washington, DC (USA)
• OSTI ID: 5895217
• Report Number(s): PB-81-221434
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300104* -- MHD Generators-- Duct Engineering & Fluid Dynamics
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMISTRY
COAL-FIRED MHD GENERATORS
DIRECT ENERGY CONVERTERS
ECONOMIC ANALYSIS
ECONOMICS
FLUID MECHANICS
HYDRODYNAMICS
MAGNETOHYDRODYNAMICS
MASS SPECTROSCOPY
MECHANICS
MHD GENERATORS
OXIDES
OXYGEN COMPOUNDS
PLASMA
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RECOVERY
SEED-SLAG INTERACTIONS
SLAGS
SPECTROSCOPY
THERMODYNAMICS