A centrifugal separator for cleaning gas containing liquid impurities includes a stationary casing, enclosing a separation space through which a gas flow is permitted. The stationary casing includes a surrounding side wall, a first end wall and a second end wall. An inlet extends through the stationary casing and permits supply of the gas to be cleaned. A rotating member includes a stack of separation disks rotatable around an axis of rotation. A drive member rotates the rotating member. A gas outlet permits discharge of cleaned gas, and includes an outlet opening through the side wall. A drainage outlet permits discharge of liquid impurities separated from the gas. The outlet opening is positioned opposite to the stack of separation disks.

A centrifugal separator for cleaning a gas containing liquid impurities includes a stationary casing, enclosing a separation space and a surrounding side wall, a first end wall and a second end wall. An inlet extends through the stationary casing and permits supply of the gas to be cleaned. A rotating member includes a stack of separation disks rotatable around an axis of rotation by means of a drive member. A gas outlet permits discharge of cleaned gas and comprises an outlet opening through the stationary casing and an upstream portion extending from the outlet opening. A drainage outlet permits discharge of liquid impurities separated from the gas. The drainage outlet is provided in the gas outlet downstream the upstream portion. The gas outlet conveys the liquid impurities to the drainage outlet.

A centrifugal separator for cleaning a gas containing liquid impurities includes a stationary casing, enclosing a separation space and a surrounding side wall, a first end wall and a second end wall. An inlet extends through the stationary casing and permits supply of the gas to be cleaned. A rotating member includes a stack of separation disks rotatable around an axis of rotation by means of a drive member. A gas outlet permits discharge of cleaned gas and comprises an outlet opening through the stationary casing and an upstream portion extending from the outlet opening. A drainage outlet permits discharge of liquid impurities separated from the gas. The drainage outlet is provided in the gas outlet downstream the upstream portion. The gas outlet conveys the liquid impurities to the drainage outlet.

The invention relates to a decanter centrifuge with a rotating bowl (1) provided with at least one solids discharge port (11) and at least one clarified liquid discharge port (15) and a screw conveyor (2) disposed coaxially within said rotating bowl rotated in the same direction with a differential rotational speed, where a feed suspension to be separated is introduced into a ring shaped space formed between said rotating bowl (1) and said screw conveyor (2) through a central feed pipe fixed to the end of the screw conveyor and supported in at least one bearing and can be separated by centrifugal force into a solid and a liquid phase so that said solid phase is discharged from said solid discharge port and said liquid phase is discharged from said clarified liquid discharging apparatus. According to the present invention it is characterized by a liquid phase conduit (4) arranged in the hollow shaft of the rotating bowl (1) guiding the liquid phase outside of the bearings (16, 18), a liquid phase discharge valve (14) provided outside the bearing on the side facing away from the bowl (1) and screw (2) and a sealing (6) at the end of the feed pipe (10) surrounded by the liquid phase conduit. So it is possible to pressurize the system and to use the pressure from the feed pump to support the cake transport in the solids transporting part of the bowl, thereby eliminating the need for variable speed conveyor control and equipment.

The invention relates to a decanter centrifuge with a rotating bowl (1) provided with at least one solids discharge port (11) and at least one clarified liquid discharge port (15) and a screw conveyor (2) disposed coaxially within said rotating bowl rotated in the same direction with a differential rotational speed, where a feed suspension to be separated is introduced into a ring shaped space formed between said rotating bowl (1) and said screw conveyor (2) through a central feed pipe fixed to the end of the screw conveyor and supported in at least one bearing and can be separated by centrifugal force into a solid and a liquid phase so that said solid phase is discharged from said solid discharge port and said liquid phase is discharged from said clarified liquid discharging apparatus. According to the present invention it is characterized by a liquid phase conduit (4) arranged in the hollow shaft of the rotating bowl (1) guiding the liquid phase outside of the bearings (16, 18), a liquid phase discharge valve (14) provided outside the bearing on the side facing away from the bowl (1) and screw (2) and a sealing (6) at the end of the feed pipe (10) surrounded by the liquid phase conduit. So it is possible to pressurize the system and to use the pressure from the feed pump to support the cake transport in the solids transporting part of the bowl, thereby eliminating the need for variable speed conveyor control and equipment.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing, enclosing a separation space through which a gas flow is permitted, a gas inlet extending through the stationary casing and permitting supply of the gas to be cleaned, a rotating member including a plurality of separation members arranged in the separation space and being arranged to rotate around an axis of rotation. The separator includes a gas outlet arranged in the stationary casing and configured to permit discharge of cleaned gas and including an outlet opening through a wall of the stationary casing, a drainage outlet arranged in the stationary casing and configured to permit discharge of liquid contaminants separated from the gas to be cleaned. The separator includes a turbine casing in which a turbine wheel that is drivingly connected to the rotating member is arranged; and a nozzle arranged for directing a jet of pressurized liquid towards the turbine wheel, thereby rotating said turbine wheel. The turbine casing includes a turbine outlet for drainage of the liquid used for rotating said turbine wheel. The turbine casing has a geometry such that the liquid used for rotating said turbine wheel is leaving said turbine outlet with a remaining kinetic energy that is higher than the energy obtained from gravity alone.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing, enclosing a separation space through which a gas flow is permitted, a gas inlet extending through the stationary casing and permitting supply of the gas to be cleaned, a rotating member including a plurality of separation members arranged in the separation space and being arranged to rotate around an axis of rotation. The separator includes a gas outlet arranged in the stationary casing and configured to permit discharge of cleaned gas and including an outlet opening through a wall of the stationary casing, a drainage outlet arranged in the stationary casing and configured to permit discharge of liquid contaminants separated from the gas to be cleaned. The separator includes a turbine casing in which a turbine wheel that is drivingly connected to the rotating member is arranged; and a nozzle arranged for directing a jet of pressurized liquid towards the turbine wheel, thereby rotating said turbine wheel. The turbine casing includes a turbine outlet for drainage of the liquid used for rotating said turbine wheel. The turbine casing has a geometry such that the liquid used for rotating said turbine wheel is leaving said turbine outlet with a remaining kinetic energy that is higher than the energy obtained from gravity alone.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing, enclosing a separation space through which a gas flow is permitted, the stationary casing including a surrounding side wall, an upper end wall and a lower end wall; a gas inlet; a rotating member including a plurality of separation members; a gas outlet; a drainage outlet; a drive member for rotating the rotating member; at least one guiding vane arranged for guiding separated liquid impurities on the inner surface of the lower end wall from a radial outer position to the drainage outlet; and a radial disc element arranged on top of the at least one guiding vane. The radial disc element extends radially in the separation space to a position radially inwards from the surrounding side wall, thereby forming an annular channel for separated liquid impurities at the inner surface of the surrounding side wall.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing, enclosing a separation space through which a gas flow is permitted, the stationary casing including a surrounding side wall, an upper end wall and a lower end wall; a gas inlet; a rotating member including a plurality of separation members; a gas outlet; a drainage outlet; a drive member for rotating the rotating member; at least one guiding vane arranged for guiding separated liquid impurities on the inner surface of the lower end wall from a radial outer position to the drainage outlet; and a radial disc element arranged on top of the at least one guiding vane. The radial disc element extends radially in the separation space to a position radially inwards from the surrounding side wall, thereby forming an annular channel for separated liquid impurities at the inner surface of the surrounding side wall.

A centrifugal separator for cleaning gas containing contaminants including a stationary casing, enclosing a separation space through which a gas flow is permitted, said stationary casing comprising a surrounding side wall, an upper end wall and a lower end wall, a gas inlet extending through the stationary casing and permitting supply of the gas to be cleaned, a rotating member comprising a plurality of separation members arranged in said separation space and being arranged to rotate around an axis of rotation, a gas outlet arranged in the stationary casing and configured to permit discharge of cleaned gas and comprising an outlet opening through a wall of the stationary casing, a drainage outlet arranged in a lower portion of the stationary casing and configured to permit discharge of liquid contaminants separated from the gas to be cleaned, a drive member for rotating the rotating member, wherein the centrifugal separator further comprises at least one guiding vane arranged for guiding separated liquid impurities on the inner surface of the lower end wall from a radial outer position to the drainage outlet.