Development of a packed-bed letdown valve for coal-liquefaction plants
Pressure letdown of coal-liquefaction slurry from high-pressure (13.9 mPa or 2000 psig), high-temperature (730 K) reactor/dissolvers can be accomplished using a packed bed. This concept could resolve the severe erosion problem which accompanies the use of conventional valves. Three-phase slurry letdown was simulated using two-phase (H/sub 2/O(l)-N/sub 2/(g)) cocurrent upflow, with packed-bed pressure drops to 8.3 mPa (1200 psig). A semiempirical model predicting the pressure gradient for two-phase, cocurrent upflow in a packed bed is presented. Packed-bed letdown-valve designs which control linear slurry velocity and thus minimize erosion are presented. Preliminary cost analysis indicates carbon steel is an acceptable packing material.
- Research Organization:
- Massachusetts Inst. of Tech., Oak Ridge, TN (USA). School of Chemical Engineering Practice
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6591665
- Report Number(s):
- ORNL/MIT-321
- Country of Publication:
- United States
- Language:
- English
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Packed-bed letdown studies
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Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CARBON STEELS
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
CONTROL EQUIPMENT
DATA
DESIGN
EQUIPMENT
EROSION
EXPERIMENTAL DATA
FLOW REGULATORS
FLUID FLOW
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LIQUEFACTION
MATERIALS
NUMERICAL DATA
PACKED BED
PERFORMANCE TESTING
PRESSURE DROP
STEELS
TESTING
THERMOCHEMICAL PROCESSES
TWO-PHASE FLOW
VALVES