Fouling experiments for the convective heat exchangers of an MHD plant
At the Argonne MHD Process Engineering Laboratory (AMPEL), five tests have been carried out during FY 1981 to investigate the deposition of seed-ash deposits that form on tubes in the convective sections of the MHD/steam bottoming plant. The effect of these deposits on heat transfer, their tenacity, and their composition was determined. In these tests, combustion gas containing ash particles and K/sub 2/SO/sub 4/ was passed through a bank of 15 vertical, cooled tubes, which simulated a steam superheater or reheater. The tube wall temperatures were between 580 and 860/sup 0/K. Over the gas temperature range of 1230 to 1820/sup 0/K, the seed material in the gas stream was present as vapor, liquid droplets, or solid particles. The deposits that formed on the tubes were mostly K/sub 2/SO/sub 4/ with 10 to 40 mass % ash. The slag phase contained about 10 mass % water-insboluble potassium. The seed-ash deposits were of two distinct types. At gas temperatures below the seed melting point, the deposition of entrained solid seed particles formed a low density deposit; above the seed melting point, the liquid seed droplets or the seed vapor formed a deposit that had a dense, ash-rich outer layer. Effective thermal conductivities of deposits formed at gas temperatures above the seed melting point ranged from 0.33 to 0.4 W/m.K and tended to increase with temperature. From these conductivities, fouling factors can be estimated for a wide range of gas conditions and tube bank configurations. These tests completed to date support the premise that the convective sections of the MHD/steam bottoming plant can be designed to operate efficiently and reliably. (WHK)
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6905472
- Report Number(s):
- ANL/MHD-82-1; ON: DE83000932
- Country of Publication:
- United States
- Language:
- English
Similar Records
Seed-slag fouling and corrosion in an MHD steam bottoming plant
Seed-slag fouling and corrosion in an MHD steam bottoming plant
Related Subjects
COAL-FIRED MHD GENERATORS
HEAT EXCHANGERS
FOULING
MHD POWER PLANTS
ASHES
BOTTOMING CYCLES
COAL
COMBUSTION PRODUCTS
DEPOSITS
HEAT RECOVERY
HEAT TRANSFER
MASS TRANSFER
PLASMA SEEDING
POTASSIUM
POTASSIUM SULFATES
SEED RECOVERY
SEED-SLAG INTERACTIONS
STEAM GENERATORS
TESTING
THERMAL CONDUCTIVITY
TUBES
ALKALI METAL COMPOUNDS
ALKALI METALS
BOILERS
CARBONACEOUS MATERIALS
DIRECT ENERGY CONVERTERS
ELEMENTS
ENERGY RECOVERY
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
MATERIALS
METALS
MHD GENERATORS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POWER PLANTS
RECOVERY
RESIDUES
SULFATES
SULFUR COMPOUNDS
THERMODYNAMIC CYCLES
THERMODYNAMIC PROPERTIES
VAPOR GENERATORS
300103* - MHD Generators- Materials
Components
& Auxiliaries