Properties of refractories after exposure to high pressure gases. VI. Vapor vs. liquid contact

Journal Article · Tue Jun 01 04:00:00 EDT 1982 · Mater. Eng.; (United States)

OSTI ID:5034724

Fahr, A; Rahman, S F; Day, D E

Researchers investigated the properties of cement-bounded castables and a phosphate-bonded ramming mix before and after exposure to saturated vapor or immersed in liquid in pure steam, CO-steam, and a gas mixture containing H/sub 2/O, CO, CO/sub 2/, CH/sub 4/, H/sub 2/, and H/sub 2/S at pressures and temperatures encountered at the cold-face refractory lining in coal gasifiers (1000/sup 0/F or 538/sup 0/C and 1000 psi or 6.9 MPa). The study concluded that the calcium aluminate cement phases in refractory castables readily react with CO, CO/sub 2/, or steam to form compounds such as AlO(OH) and calcite (CaCO/sub 3/). Reduced porosity and increased flexural stength generally accompany the formation of these compounds. A follow-up correlation of these properties with the chemical reactions occurring in the refractories indicates no major difference between the properties of castables immersed in liquid and those exposed to saturated vapor. However, the loss of CaO that occurs under saturated conditions (both vapor and liquid) must be considered in the long-term service performance of castables. Although no detrimental change in properties, such as diminished strength, was attributed to leaching of CaO from the castable, the effect of the complete removal of CaO over a longer period of time remains unknown. Possibly, it might destroy the stuctural integrity of a castable if the bonding is destroyed and not replaced by another bond phase of some type such as boehmite.

• Research Organization: Ontario Research Foundation, Canada
• OSTI ID: 5034724
• Journal Information: Mater. Eng.; (United States), Journal Name: Mater. Eng.; (United States) Vol. 4; ISSN MAENB
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALUMINATES
ALUMINIUM COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL PROPERTIES
COAL GASIFICATION
CORROSIVE EFFECTS
DISSOLUTION
ELEMENTS
FLEXURAL STRENGTH
FLUIDS
GAS GENERATORS
GASES
GASIFICATION
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
LEACHING
MECHANICAL PROPERTIES
MEDIUM PRESSURE
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POROSITY
REFRACTORIES
SEPARATION PROCESSES
STEAM
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
VAPORS
WATER VAPOR