Coal-slag phenomena in MHD generators. Final report

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5205526

Koester, J K; Eustis, R H

This research program emphasized a basic approach with direct observation of slag phenomena. The overall purpose of the project was the characterization of the envelope of conditions under which acceptable operation of coal-fired open-cycle MHD generators could be achieved when generator wall protection with coal slag was sought. These goals were achieved by investigations of: ash deposition and slag layer fluid mechanics, slag induced electrical effects, and the chemical interaction of slag layers with electrode and insulator materials. A special effort was made to incorporate extensive diagnostics into the experimental program for direct measurement of as many parameters as possible. Due to the severe environment, optical techniques were used extensively for determining the size of slag droplets, slag layer thickness, and layer surface features and temperature. The use of imposed AC voltage was developed for the measurement of electrical properties during the DC generator operation. The laboratory program was accompanied by a modeling effort which was useful both in understanding the physical processes which occur and in extrapolating results to other conditions or to larger scale systems. The extrapolation of slag phenomena from laboratory scale testing to a central-station scale MHD generator was made. The effects of slag on a fixed generator configuration and set of operating conditions were determined so that problem areas could be assessed. Finally, several techniques are recommended for alleviating the effects induced by slag ionic conductivity.

• Research Organization: Stanford Univ., CA (USA). Dept. of Mechanical Engineering
• OSTI ID: 5205526
• Report Number(s): EPRI-AP-2201; ON: DE82902080
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300104* -- MHD Generators-- Duct Engineering & Fluid Dynamics
ASHES
COAL-FIRED MHD GENERATORS
CURRENTS
DATA
DEPOSITION
DIMENSIONS
DIRECT ENERGY CONVERTERS
ELECTRIC ARCS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ELECTRODES
EQUIPMENT
EROSION
EXPERIMENTAL DATA
FLUID MECHANICS
INFORMATION
IONIC CONDUCTIVITY
LAYERS
MAGNETIC FIELDS
MECHANICS
MHD CHANNELS
MHD GENERATORS
NUMERICAL DATA
PARTICLE SIZE
PERFORMANCE TESTING
PHYSICAL PROPERTIES
RESIDUES
SIZE
SLAGS
TEMPERATURE DEPENDENCE
TEST FACILITIES
TESTING
THICKNESS
VISCOSITY