Method and apparatus for dynamic concentration of a suspension
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsWolfgang Epper, Rupprecht Graf
Life of this patent
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Abstract
In the dynamic concentration of a suspension, in which the suspension is fed into a filter which has a driven stirring device, and in which the suspension forms a filter cake which is continually remixed by stirring with the suspension being dehydrated and maintained in a liquid state up to a desired degree of concentration, the power consumption of the stirring device is measured, in particular the torque is measured, and the intensity of the stirring motion is controlled in accordance with the measured torque by causing a change in the number of revolutions per minute of the stirring device in response to the torque transgressing an upper limit or a lower limit.
Claims14
In a method of dynamic concentration of a suspension in which the suspension is fed into a filter which has a stirring device driven by a drive device and forms a filter cake which is continually remixed by stirring with the suspension being dehydrated and maintained in a liquid state up to the desired degree of concentration, the improvement therein comprising the steps of:
- measuring the power consumption of the stirring device;
- and
- controlling the intensity of the stirring motion in accordance with the measured power consumption.
An apparatus for dynamic concentration of a suspension, comprising:
- a filter including a suspension intake, a concentrate discharge and a rotatable stirring device;
- a prime mover connected to and operable to rotate said stirring device;
- first means connected to said prime mover for operating said stirring device at a predetermined speed;
- second means connected to said prime mover for measuring the power consumption and providing an actual speed signal;
- comparison means connected to said second means;
- third means connected to said comparison means and operable to feed upper and lower limit values to said comparison means, said comparison means operable in response to an actual speed signal which transgresses a limit signal to limit a speed correction signal;
- and
- fourth means connected between said third means and said prime mover for adjusting the operating speed in response to the speed correction signal.
Dependencies are inferred from the claim text.