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Coal injector for coarse slurry transport.

Burnett M; Rubin LS; Harvey A; Roberge JC; Cardenas RL
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract J0333914, 1983 Dec; :1-262
An inducer-type pump, capable of injecting dry coal into a hydraulic transport pipeline was developed and installed in a specially designed and fabricated slurry injector vehicle. The full-scale prototype injector system can deliver up to 11 ton/min of coal into an 8-in pipeline at pressures up to 95 lb/in2. The injector operates on centrifugal principles with flow passing axially through a helical-pitched conical rotor. Water is delivered to the pump through an annular slot at the atmospheric pressure coal inlet. The spinning rotor maintains an air-core vortex of water that pressurizes the discharge housing. A screw feeds coal through the open inlet into the vortex. The inner radius of the vortex contracts as pressure is increased, giving a limiting maximum pressure that is proportional to the square of the rotor speed. Below this limit, flow rate, discharge pressure, and rotor speed are independent variables. The self-powered, 42-in-high slurry injector vehicle follows and receives run-of-mine coal from a continuous miner, reduces the top size to 3 in, and delivers the sized coal to the injector feed screw for slurry formation and pumps it through a mobile hose attached to the vehicle's outby end.
Coal; Injectors; Slurry-pipelines; Mineral-processing; Transport-mechanisms
Publication Date
Document Type
CP; Final Contract Report
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
OFR 190-84; Contract-J0333914
NIOSH Division
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract J0333914
Performing Organization
Foster-Miller, Inc., Waltham, Massachusetts
Page last reviewed: March 11, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division