Chemical and physical stability of refractories for use in coal gasification. Quarterly progress report, November 1, 1977--January 31, 1978

Technical Report · Fri Feb 10 04:00:00 EST 1978

DOI:https://doi.org/10.2172/6708613· OSTI ID:6708613

Rahman, S. F.; Day, D. E.

General conclusions are based on the results obtained to date in the three CO/H/sub 2/O and 60 day exposure tests: (1) Large weight losses were observed for refractory samples immersed in water in the CO/H/sub 2/O = 3 test compared to CO/H/sub 2/O = 0.1 or 1 tests and, in general, increased with increasing CO/H/sub 2/O ratio. This weight loss is most likely due to the dissolution of CaO from the refractories. Chemical analysis is in progress. (2) The weight changes in the unsaturated (1000/sup 0/F) and saturated (532, 466, and 400/sup 0/F) vapors were basically the same in the three CO/H/sub 2/O tests. (3) With a few exceptions high and intermediate alumina refractories generally had the lowest porosity when exposed to the saturated atmosphere (vapor or liquid) at CO/H/sub 2/O = 0.1 and the highest when immersed in water at CO/H/sub 2/O = 3.0. (4) Porosities of high and intermediate alumina refractories in unsaturated atmospheres and insulating castables in saturated and unsaturated atmospheres generally remained nearly constant for CO/H/sub 2/O ratios of 0.1 to 3. (5) The effect of saturation on the flexural strength of high and intermediate alumina was significant in all three CO/H/sub 2/O tests and, in general, the flexural strength increased by a factor of 2 compared with the unexposed samples or samples exposed to unsaturated conditions. The effect of saturation on the insulating castables was slightly beneficial at CO/H/sub 2/O = 1 and 3 where the flexural strength generally increased. Changes in weight, dimension, density-porosity, and MOR of refractory samples after a 60 day exposure in the ERDA atmosphere were basically the same as observed after 30 days in similar exposure conditions.

• Research Organization: Missouri Univ., Rolla (USA)
• OSTI ID: 6708613
• Report Number(s): COO-2904-7
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ATMOSPHERES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COAL GASIFICATION PLANTS
COMPARATIVE EVALUATIONS
CONTROLLED ATMOSPHERES
CORROSION RESISTANCE
CORROSIVE EFFECTS
DATA
DENSITY
FLEXURAL STRENGTH
FLUIDS
GASES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INDUSTRIAL PLANTS
INFORMATION
MATERIALS TESTING
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POROSITY
REFRACTORIES
SULFIDES
SULFUR COMPOUNDS
TESTING
VAPORS
WATER VAPOR