Method and apparatus for fluidized steam drying of low-rank coals

Patent · Tue Jul 22 04:00:00 EDT 1986

OSTI ID:5490255

Draper, R; Wolfe, R W

An apparatus is described for drying low-rank coals containing interstitial water which consists of: a sealed vessel containing means for forming a plurality of successive fluidized beds of solids therein, having means for passing low-rank coal solids thereto at one end and means for removing the low-rank coal solids therefrom at the other end after passage therethrough; heat exchange tubes extending into the sealed vessel at the location of each of the fluidized beds; steam injector means at the other end of the sealed vessel for charging steam into the vessel for passage therethrough countercurrent to the flow of low-rank coal solids to fluidize the same in each of the plurality of successive fluidized beds, and remove interstitial water therefrom to form a composite steam flow; means for exhausting the composite steam flow from the one end of the sealed vessel; means for partially condensing the composite steam flow, to which the composite steam flow is passed after exhaustion from the vessel, so as to remove a supply of condensed water therefrom substantially equal to the water removed from the low-rank coal in the sealed vessel.

• Assignee: Westinghouse Electric Corp., Pittsburgh, PA
• Patent Number(s): US 4601113
• OSTI ID: 5490255
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
CARBONACEOUS MATERIALS
COAL
COAL RANK
COMPRESSION
CONTAINERS
COOLING
COUNTERFLOW SYSTEMS
DRYERS
DRYING
ENERGY SOURCES
ENERGY TRANSFER
FLUIDIZED BEDS
FLUIDS
FOSSIL FUELS
FUELS
GROUND WATER
HEAT FLOW
HEAT PIPES
HEAT TRANSFER
HEAT TRANSFER FLUIDS
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
MATERIALS
OXYGEN COMPOUNDS
REMOVAL
STEAM
VAPOR CONDENSATION
WATER
WATER REMOVAL