Determination of flowing mineral suspension density, for e.g. ores, coal, gypsum or sand

摘要

The control computer is supplied with currently-measured values of pump motor power consumption (13). The density of the flowing suspension is determined in terms of the power consumed at given speed(s). An Independent claim is included for corresponding equipment to carry out the measurement. Preferred features: Density is determined by division of the measured pump power, by a pump power coefficient. The pump power coefficient is determined from a functional relationship involving at least the pump rotary speed and the dependence of pumping efficiency on total working time. In one operational mode, the computer (11) controls pump (16) motor (15) speed in terms of plant parameter(s) through a variable speed drive (14) (frequency converter type). In another, to determine the density, the pump is operated at constant speed. A variant based on similar principles is described.