DE102004036130C5 - Method for operating a centrifuge and centrifuge for carrying out the method - Google Patents

Abstract

Method for operating a continuously operating nozzle separator having a drum (1) with a vertical axis of rotation and a disk pack (3) in the drum (1), in which an emergency fluid, in particular water, is passed into the centrifuge drum in an emergency, characterized in that Occurrence of a power failure, the rotational energy of the drum (1) of the centrifuge is used to generate an electric current, wherein the generated current is used by a pump (14) to direct the emergency fluid into the drum (1) Power failure, an electric motor (10) for driving the drum (1) via a control device (11) is operated as a generator.

Description

The invention relates to a method for operating a nozzle separator according to the preamble of claim 1.

State of the art

In the event of power failures, jet separators continue to rotate and run empty due to lack of further product feed through the nozzles, which may be problematic due to the residual kinetic energy of the further rotating drum of the separator. To prevent dangerous situations z. B. by imbalances due to clogging nozzles or the like. It is therefore advantageous if even in case of power failure, a liquid is passed into the drum to prevent the idling of the further rotating drum until this - among other things, by the progressive release of kinetic energy the constant ejection of liquid - finally stops. To descend a nozzle separator with such safety water, z. B. realized relatively high-volume tanks above the machine to direct the water into the drum. The volume of the amount of water usually corresponds to the total nozzle power over the time of the outlet of the drum. Such a solution is z. B. in the introduction to the description of the generic DE 102 47 646 A1 described. It means a high expenditure on equipment and a high cost and space requirements for the high tank.

task

The invention has the object to solve this problem in a simple manner and to provide a method with the simplified safety functions in power failure can be realized on nozzle separators and safety water in case of power failure with reduced space requirements of safety devices in the drum of a jet separator can be passed.

The invention solves this problem by the subject matter of claim 1.

In this case, the power generated by the electric motor is used to direct an emergency fluid, in particular water, in the case of a power failure by means of a pump into the centrifuge drum. This saves in a simple way the previously necessary in particular for jet separators large high tank with which according to the prior art, the safety water has been passed in a power failure in the drum. Generating the electrical energy advantageously brakes the drum in addition.

Furthermore, in the case of a power failure, an electric motor which is present anyway for driving the drum is operated in a regenerative manner via a control device in a particularly advantageous manner.

Although it is known per se to operate electric motors as a generator. However, it has not been thought to use the energy of the still rotating drum in case of power failure for safety functions and to realize this in a particularly simple manner that the electric motor is operated as a generator, especially an energy recovery - in itself the reason for applications of regenerative electric motors - is not realistic for reasons of energy cost reduction.

From the EP 1 154 957 B1 It is known to use for drinking water supply of a building a self-priming continuous centrifuge with a rotating filter and to use in a power failure, the generator winding of the drive to obtain the power supply for the magnetic layer to put the rotor only at low speed on emergency storage until it there comes to rest.

embodiment

The invention will be explained in more detail by means of exemplary embodiments with reference to the drawing. It shows:

1 a highly schematic view of an arrangement according to the invention; and

2 a highly schematic view of a known separator drum.

2 shows a nozzle drum 1 for a separator with a vertical axis of rotation D, the drum 1 a spin room 2 bounded and where in the drum 1 a plate package 3 from a plurality of here conical plates 4 is arranged. In the plate package 3 are preferably rising channels formed (not visible here).

Terms such as "top,""bottom,""front," or "rear," and the like, merely refer to the illustrated embodiments and are not meant to be limiting. For example, in alternative embodiments, not shown here, the feed pipe can also be guided from "below" into the drum, although in FIG 1 a variant is shown, in which the inlet pipe is guided from above into the drum.

The centric inlet pipe 5 for the centrifugal opens here first from above into a distributor 6 , the channels 7 having, which the centrifuged outward into the centrifugal space 2 conduct.

To realize the concentrate discharge here are several nozzles 8th on the outer circumference of the drum 1 or the centrifugal space 2 distributed. At least one drainage channel 9 allows the derivation of at least one liquid phase via at least one paring disc (not shown here) from the centrifugal space 2 ,

The drum 1 with inlet pipe 5 from the top into the drum 3 sits on a not visible here spindle, which is usually stored multiple times (not shown here) and z. B. via a transmission or a belt drive and an electric motor 10 is drivable to a control unit 11 is connected (see 1 ).

In the case of a power failure now the electric motor 10 operated as a generator to generate a current that can be used for safety functions. First and foremost here is the safety function of introducing safety water into the drum 1 to call in the power failure. The over the control unit 11 and a suitable generator circuit (not shown here) with inverters or the like of the electric motor operated as a generator 10 generated energy (which in normal operation via a supply connection 12 is supplied with power) is used to over a supply line 13 a pump 14 to drive with enough safety water through into the drum 1 is pumpable to keep them filled, decelerate and block clogging of the nozzles.

To 1 the pump is a valve 15 upstream, which allows a drum feed line 18 between a product supply line 16 and a supply line 17 for the emergency liquid, in particular the emergency water, to switch. It is also conceivable to recirculate the liquid (s) emerging from the separator into the drum in the circuit (not shown here) in order to maintain the emergency function until the drum stops 2 to realize.

In addition, z. B. warning signals or the like. Be activated with generated by the residual rotation of the drum electrical energy.

LIST OF REFERENCE NUMBERS

1

drum

2

centrifugal chamber

3

Disc stack

4

Plate

5

supply pipe

6

distributor

7

channels

8th

jet

9

Waterway

10

electric motor

11

control unit

12

supply terminal

13

supply line

14

pump

15

Valve

16

product supply

17

supply

18

Drum inlet line

D

axis of rotation

Claims (1)

Method for operating a continuous nozzle separator with a drum ( 1 ) with a vertical axis of rotation and a disc package ( 3 ) in the drum ( 1 ), in which an emergency liquid, in particular water, is conducted into the centrifuge drum in an emergency, characterized in that, in the event of a power failure, the rotational energy of the drum ( 1 ) the centrifuge is used to generate an electric current, whereby the generated current is used by means of a pump ( 14 ) the emergency fluid in the drum ( 1 ) to guide why in the power failure an electric motor ( 10 ) for driving the drum ( 1 ) via a control device ( 11 ) is operated as a generator.

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