Imperforate bowl: centrifugal separators – Process
Patent
1996-02-20
1997-02-04
Cooley, Charles E.
Imperforate bowl: centrifugal separators
Process
494 56, 494 70, B04B 1102
Patent
active
055992714
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a method of regulating during operation the outlet flow of a liquid separated in a separation chamber in a rotor of a centrifugal separator, the rotor being rotatable around the rotational axis in a predetermined rotational direction, in which method the separated liquid is conducted into an outlet chamber and is brought to form a rotating liquid body in the outlet chamber with a radially inwardly directed free liquid surface and is discharged out of the outlet chamber through a stationary discharge device, which has at least one internal outlet channel with an inlet opening in a radially outer part of the discharge device, which during operation is located radially outside the free liquid surface.
Furthermore, the invention concerns a centrifugal separator, in which the outlet flow of a separated liquid is regulated according to this method. Such a centrifugal separator comprises a rotor, which is rotatable around a rotational axis in a predetermined direction and forms an inlet chamber for a liquid to be centrifugally treated, a separation chamber, which is connected to the inlet chamber, and an outlet chamber, which is delimited axially by two end walls and radially by a circumferential wall connecting these end walls and is arranged to receive during operation a liquid separated in the separation chamber, the outlet chamber being so designed that the liquid present in the same forms a rotating liquid body having a radially inwardly directed free liquid surface. The rotor also forms a connection, which is arranged through one of said end walls and has an opening in the outlet chamber located radially inside the radial level of the free liquid surface. The outlet chamber communicates through this connection with the separation chamber. The centrifugal separator also comprises a stationary discharge device, which is arranged in the outlet chamber and has at least one to an outlet connected outlet channel with an inlet opening in a part of the discharge device, which is located radially outside the free liquid surface.
BACKGROUND OF THE INVENTION
A centrifugal separator of this kind is shown in WO 89/03250. During operation of the shown centrifugal separator the liquid present in the outlet chamber is entrained gently into the rotation of the rotor by means of discs, which are arranged in the outlet chamber. The separated liquid is discharged out of the outlet chamber through a stationary discharge device arranged therein, which is connected to an outlet. The flow of the discharged liquid depends on the angular speed of the rotating liquid in the outlet chamber, the radial position of the free liquid surface, the design of the discharge device, and the prevailing counter pressure in the outlet for the liquid.
For every use of such a centrifugal separator a discharge device is chosen having for the actual case a suitable flow capacity range, which is limited for one and the same discharge device. Within the flow capacity range the flow is regulated by adjusting the counter-pressure in the outlet. If the actual flow of the separated liquid is low the counter-pressure from the equipment connected to the outlet often is insufficient and an extra counter-pressure has to be imposed at the outlet, which means energy losses. Besides, a low flow through the discharge device often results in an unstable flow, which in turn gives rise to rotor dynamical oscillations.
SUMMARY OF THE INVENTION
The object of the present invention is to accomplish a method and a centrifugal separator of the kind initially described, which makes it possible to regulate the outlet flow of the liquid, which is separated in a centrifugal separator and is discharged out of the same through a stationary discharge device within a wide flow range with small energy losses and with a small risk of rotor dynamical oscillations.
According to the present invention this is accomplished by the fact that the outlet flow discharged through the discharge device is regulated by bringing at least
REFERENCES:
patent: 4718887 (1988-01-01), Gunn
patent: 4784635 (1988-11-01), Bruning et al.
Alfa Laval Separation AB
Cooley Charles E.
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