DE1112500B - Device, especially in gas cleaning systems, to prevent contamination and humidification of high-voltage electrodes - Google Patents

Description

The invention relates to a device, in particular in electrical gas cleaning systems, for prevention the soiling and humidification of, which cancel or reduce the insulating effect High voltage electrodes placed in a moist or polluted gas.

It is known that the dust deposits on electrical insulators by blowing with compressed air prevent or eliminate. In a known electric gas cleaner, the mounting rails are for Outflow electrodes on insulators, which are arranged in side niches of the separation room. In Clean gas is introduced into each of these niches, which feeds the isolator located in the niche brushed from the outside and then through together with the heating gas flowing through the hollow insulator a chimney placed on top of the niche is removed from it.

Furthermore, it is known that introduced into the separation chamber of an electrical gas cleaning system Part of the high-voltage insulators to be surrounded with a protective sleeve, through the air or gas blown to prevent dust from accumulating on the insulator. It must be used as a feed pipe for the clean gas protective sleeve at a sufficient distance from the high-voltage electrode end up with a flashover of the voltage from the electrode to the end of the clean gas pipe Avoid security. However, this means that the gas flow through the supply pipe with considerable Speed and therefore must be passed in large quantities so that the out of the feed pipe Exiting clean gas flow through the perpendicular to it, to be dedusted gas flow extends through to the end of the electrode 'and in this way the electrode against the dust-laden Main stream shields.

In another known electrical gas cleaning system, the one that protrudes into the separation space Part of the insulation of the high-voltage electrode surrounded by a conical casing, which rests with its wider part on the wall of the separation room. Through a number of tubes hot air is introduced into the jacket, which prevents dust from entering the insulation. the Sheathing extends beyond the insulation so that its opening edge surrounding the electrode has a relatively large diameter must have so that a flashover between the high-voltage electrode and the sheathing is excluded is. On the one hand, the arrangement of the sheathing chosen here causes a strong flow of the

Facility,

especially in gas cleaning systems
to prevent pollution
and humidification of high voltage electrodes

Applicant:

Georg Ronge, Rottach-Egern, Kobellstr. 3,
and Horst Gerlach, Munich 23, Ohmstr. 11

led hot air, and on the other hand, is due to the wide sheath, especially at its base the cross-section of the separation space in the vicinity of its upper wall is not insignificantly affected.

The invention is intended to avoid these disadvantages and at the same time provide complete protection for the insulation can be achieved against contamination and humidification by the gas to be cleaned. The invention works from a facility, especially in gas cleaning systems, to prevent pollution and humidification of high voltage electrodes placed in a humid or polluted gas using a stream of clean gas that flushes the insulators, possibly heated, the feed pipe that surrounds the insulators and is guided from the outside through the wall of the gas space is forwarded. According to the invention, the solution to the problem posed is to do as much as possible Feed pipe that is led far into the gas space at its end with a bell-like hood body to be provided from preferably electrically insulating material, the free edge of which is on the one hand at a sufficient distance from the electrode extending beyond this edge and on the other hand extends so far into the gas space that the stream of clean gas emerging from the bell-shaped hood body shields the insulator in the gas space until about the end.

In a further development of the invention, the hood body is at a certain distance from the mouth opening of the supply pipe for the clean

109 677/187

Claims (2)

arranged gas flow guide body through which the clean gas flow slides to the inner wall of the bell-like hood body and is then introduced along this into the gas space. An example of the invention is given below: A high-voltage electrode in the middle of a grounded duct with a clearance of 60 cm leads to a voltage of 50,000 volts compared to the ground. An air stream with a speed of 2 m / secr is passed through the channel wml past the electrode, which carries concentrated, dense, floating dust and to which, immediately before it passes the "electrode, dense water mist" flows. "The, holder ... and supply line to the electrode, which leads through the earthed duct wall and is mounted on it, would be so densely pelted with wet dust within a few seconds by the onslaught of wet dust particles and mist droplets that the voltage would immediately be applied to the holder and the duct wall the earth would run off. A device such as that shown schematically in FIGS. 1 and 2 prevents this. The electrode lead 3, which carries the electrode 4 at its end, is passed through the earthed housing wall 1, embedded in an insulating material 2. This insulated electrode bushing 2> 3 is surrounded by a tube 5, which is also expediently made of insulating material. Between the insulation 2 and the inner wall of the tube 5, gas (for example air) is fed from a fan 6 to the electrode body. The insulating electrode leadthrough 2, 3 can pass through the wall of the bent gas pipe 5 via the leadthrough 8 and be held centrally in the pipe 5 by a star holder 7, for example. The tube 5 ends in a hood 9 made of insulating material, the clearance 10 of which is selected so large that no flashovers through the air or the gas are possible from the electrode 4 to the wall edge 9 α. At some distance above the mouth 5 ″ of the open pipe 5 in the hood 9 is here, for. B. on the electrode supply 2, 3 a plate 11 is attached, which acts as a guide surface that the gas flowing in through the pipe 5 is deflected so that it has to brush over the inner walls of the hood 9. If air is now sent through the pipe 5 from the fan 6, expediently via a gas heater 12, the heated air will flow around the electrode 4 in the width of the hood 9 and this and its insulation 2 and also the inner walls of the hood 9 in front of the Protect the approach and the deposition of the wet dust and the mist particles, which are brought in here, for example, with the gas flowing through the channel from the direction 13. With the form of the device according to the invention shown in this example, tensions of z. B. kept constant 50,000 volts at the electrode. PATEJ ^ TANSJPRuCJH1E: 1. Device in particular in gas cleaning systems to prevent the contamination and humidification of high-voltage electrodes, which - are arranged in a moist or contaminated gas, using a stream of clean gas flushing the surface of the insulator, possibly heated, through a stream surrounding the insulators, from the outside through the Wall of the gas space guided feed pipe is fed, characterized in that the lead as far as possible into the gas space feed pipe (5) is provided at its end with a bell-like hood body (9) preferably made of electrically insulating material, the free edge (9 a) on the one hand at a sufficient distance from the electrode (4) protruding over this edge and on the other hand protrudes so far into the gas space that the clean gas flow emerging from the bell-shaped hood body (9) shields the insulator (2) in the gas space up to about the end. 2. Device according to claim 1, characterized in that in the hood body (9) at a certain distance from the mouth opening (5 a) of the feed pipe (5) for the clean gas flow guide body (11) are arranged through which the clean gas flow to the inner wall of the bell-like hood body (9) is derived and then introduced along this into the gas space. Considered publications: German patents No. 348 216, 355 042,
528, 505 796, 522166, 897276; German utility model No. 1718211. 1 sheet of drawings