Experiments on mixing of coal paste

Technical Report · Wed Nov 11 00:00:00 EDT 1942

OSTI ID:6128920

John, W II

For heat exchange of bituminous coal paste in hydrogenation plants, two kinds of coal paste were necessary: thick paste and thin paste. The solid content of these had to be maintained at a certain maximum for efficient operation of the preheater and the heat exchanger. Variations in the solid content observed at the Poelitz plant - the first to use paste heat exchange - were traced to the poor results obtained with the mixing orifice and the strirrer in the supply tank, because a settling of homogenous thin coal paste in the pipelines did not take place even when heated to operating temperatures. A practically sufficient improvement of the mixing process for thin paste production was obtained when the mixing nozzle was replaced by a mechanical power stirrer (which guaranteed a sufficiently uniform mixing of the circulated components). The coupled stirring tank was then used only as a buffer tank. On the basis of qualitative and quantitative tests with a laboratory model, the recommendation was for a suitable mixer for continuous production of 1.14 tons of thin paste per hour. The mixer consisted of a ten-vane double turbine with a pipeline and breaker arms. The mixing action was increased by location of the feed line in such a manner that the mixture of thick paste and oil entering at the bottom was barely sucked out and remained as long as possible in the pump for better mixing. The relationships existing between the laboratory model and the industrial unit were used in determination of revolutions per minute, mixer dimensions, recirculation and power requirements in order to produce geometrically similar flow conditions in the laboratory and industrial models. Experiments in the laboratory model and theoretical considerations of stirring and mixing processes have resulted in producing useful suggestions for the improvement of thin coal paste preparation. 7 figures.

• Research Organization: I.G. Farbenindustrie, A.G., Ludwigshafen (Germany)
• OSTI ID: 6128920
• Report Number(s): TOM-257-654-673
• Country of Publication: United States
• Language: German

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
HYDROGENATION
COAL LIQUEFACTION PLANTS
HEAT EXCHANGERS
MIXERS
COAL PASTES
FLOW RATE
MIXING
PRODUCTION
GERMANY
NOZZLES
OILS
PIPES
PRESSURE VESSELS
SYNTHETIC FUELS
TANKS
TEMPERATURE CONTROL
TESTING
TURBINES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CONTAINERS
CONTROL
ENERGY SOURCES
FOSSIL FUELS
FUELS
INDUSTRIAL PLANTS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
TURBOMACHINERY
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
010403 - Coal & Coal Products- Hydrogenation- (-1987)