An evaluation of the fire hazard of the process of drying flotation concentrate in a fluidized bed

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Coke Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6988271

Govorov, V I; Anisimov, N Z; Goliusov, V M; Muzychuk, V D; Tatarchuk, V V; Vasyuchkov, E I

Experience in the use of coal thermal drying in fluidized bed devices shows the hazard of appearance of fires or explosions. At the Karaganda Integrated Iron and Steel Works (KMK) the fluidized bed reactors receive below 1 mm flotation concentrate with moisture of 25-32% and ash of 9-12%. A heat carrier obtained by burning coke oven gas in a furnace (temperature 560/sup 0/C) is supplied under the distribution grid of the reactor. The spent gas is withdrawn by a blower; passing through the dry and wet particulate recovery systems, part of the gas is returned to the furnace to decrease the temperature of the heat carrier and its oxygen concentration. The particulates from the dry trap hoppers go to the dried concentrate receiving conveyor, while the wet particulates go to the sludge water. The temperature regime in the drying process should be maintained within the limits: not over 150/sup 0/C above the reactor grid, 150/sup 0/C after the blower, and 80/sup 0/C ahead of the wet gas purification. For the investigation we collected specimens from the moist concentrate conveyor, the reactor wills, the dry dust trap hopper, the wet dust trap sludge water and the dust settling on the structures of the receiving conveyor duct. In the experiments, in order to eliminate the effect of moisture on the ignition of the flotation concentrate, we used dried samples with low variations in moisture (1.2-2.2%). In order to determine the probability of ignition and explosions in the drying process, we experimentally determined the spontaneous ignition temperature of the samples in the bed in an air suspension and the lower concentration limit of ignition.

• Research Organization: Karaganda Integrated Iron and Steel Works
• OSTI ID: 6988271
• Journal Information: Coke Chem. USSR (Engl. Transl.); (United States), Journal Name: Coke Chem. USSR (Engl. Transl.); (United States) Vol. 3; ISSN COKCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
016000 -- Coal
Lignite
& Peat-- Health & Safety
ASHES
BLOWERS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHEMICAL REACTORS
COAL
COAL GAS
COMBUSTION
CONTROL
CONVEYORS
DIFFERENTIAL THERMAL ANALYSIS
DISPERSIONS
DRYING
DUST COLLECTORS
ENERGY SOURCES
EQUIPMENT
EXPLOSIONS
FIRE HAZARDS
FLOTATION
FLUIDIZED BED
FLUIDS
FOSSIL FUELS
FUEL SLURRIES
FUELS
GASES
HAULAGE EQUIPMENT
HAZARDS
HEAT EXCHANGERS
HEATING
IGNITION
MATERIALS
MATERIALS HANDLING EQUIPMENT
METALLURGY
MIXTURES
MOISTURE
OXIDATION
PARTICLES
PARTICULATES
RESIDUES
SEPARATION PROCESSES
SLUDGES
SLURRIES
SPONTANEOUS COMBUSTION
STORAGE FACILITIES
SUSPENSIONS
TEMPERATURE CONTROL
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES