Low rank coal by wet oxidizing, drying and cooling

Patent · Tue Jan 10 04:00:00 EST 1989

OSTI ID:6062290

Siddoway, M A; Stidham, N D; Machmer, W C

A process is described in which low rank coal is oxidized, dried and cooled for reducing its tendency toward spontaneous combustion, an improvement comprising: contacting particulate coal with an aqueous oxidant solution which becomes substantially homogeneously distributed over the surfaces of the coal particles, without adding more than about 10% by weight of water to the coal; the solution containing an oxidizing agent containing combined oxygen; drying the oxidant solution wetted coal by heating the coal particles to a temperature between about 100/sup 0/F and about 400/sup 0/F to reduce the moisture content to substantially the moisture content desired for the coal product; and cooling the so-treated coal to a temperature of less than about 100/sup 0/F.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4797136
• OSTI ID: 6062290
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL PREPARATION
COMBUSTION
COMBUSTION PROPERTIES
COOLING
DEHYDRATION
DRYING
ENERGY SOURCES
FOSSIL FUELS
FUELS
HEATING
HIGH TEMPERATURE
MATERIALS
MEDIUM TEMPERATURE
OXIDATION
OXIDIZERS
PROCESSING
SPONTANEOUS COMBUSTION
THERMOCHEMICAL PROCESSES