Materials selection for high-pressure letdown valves in coal-liquefaction systems

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6977037

Randich, E

The high pressure letdown valve used in coal liquefaction processes must operate in a coal/ash/solvent slurry at 520 to 720 K and with letdown pressures from 1.0 x 10/sup 7/ to 2.0 x 10/sup 7/ Pa. The slurry is corrosive and extremely erosive. Proper materials selection which, for this application, has ranged chronologically from stainless steels, to stellite alloys, to cemented carbides is imperative for long lifetime components. The interdependence sound of mechanical design and materials selection is reviewed. The properties that make a given material erosion resistant are presented. Erosion performance of advanced ceramic materials such as SiC, Si/sub 3/ N/sub 4/, B and TiB/sub 2/ are evaluated, and their possible use as coatings discussed.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6977037
• Report Number(s): SAND-80-1526C; CONF-810417-1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
BORIDES
BORON
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COATINGS
CONTROL EQUIPMENT
CORROSION
CORROSIVE EFFECTS
DATA
DESIGN
DISPERSIONS
ELEMENTS
EQUIPMENT
EROSION
EXPERIMENTAL DATA
FLOW REGULATORS
INDUSTRIAL PLANTS
INFORMATION
LINERS
LIQUEFACTION
MATERIALS
MECHANICAL PROPERTIES
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
PNICTIDES
PROTECTIVE COATINGS
SEMIMETALS
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SLURRIES
SUSPENSIONS
THERMOCHEMICAL PROCESSES
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VALVES
WEAR RESISTANCE