Coal drying process
Patent
·
OSTI ID:5042378
A single step process for removing moisture from low rank coal using in-situ generated thermal energy. The process comprises the steps of: (A) feeding the wet low rank coal at room temperature into a moving bed of hot coal at a temperature in the range of from about 200/sup 0/C to about 300/sup 0/C at a rate to maintain partial combustion of the coal at atmospheric pressure, (B) maintaining said coal bed in the presence of a gas at atmospheric pressure containing from about 5% to about 20% by volume of oxygen, whereby the in-situ heat generated by the combustion is absorbed by the wet coal being fed to the system and is effective for drying the coal to the desired level, and (C) separating the dried coal from the combustion zone, whereby the dry coal obtained is highly resistant to spontaneous combustion.
- Assignee:
- Suntech Inc
- Patent Number(s):
- US 4213752
- OSTI ID:
- 5042378
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL PREPARATION
COMBUSTION
COMMINUTION
DRYING
ELEMENTS
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
HEAT TRANSFER
HIGH TEMPERATURE
IN-SITU COMBUSTION
IN-SITU PROCESSING
LIGNITE
MATERIALS
NONMETALS
OXIDATION
OXYGEN
PROCESSING
RADIANT HEAT TRANSFER
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL PREPARATION
COMBUSTION
COMMINUTION
DRYING
ELEMENTS
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
HEAT TRANSFER
HIGH TEMPERATURE
IN-SITU COMBUSTION
IN-SITU PROCESSING
LIGNITE
MATERIALS
NONMETALS
OXIDATION
OXYGEN
PROCESSING
RADIANT HEAT TRANSFER
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES