Anode earthing

 

(57) Abstract:

The invention relates to cathodic protection of objects against corrosion and electrochemical processing of soils, silts and other dispersed environments, for the purposes of cleaning, as well as to changes of salinity, moisture, strength and other properties. The device has the current lead and electrodes connected in series, each of which is designed as concentric spaced cable, thin-walled titanium case with a catalytic coating of the outer surface, pin bushings, and an airtight connection of the ends of the housing with the cable by crimping with providing electrical contact of the housing with the sleeve by welding, and the free inner space of the housing is filled with an insulating compound. On the contact surface of the housing with the sleeve can be applied locally, a layer of copper or other metal by the method of friction coating. On top of the catalyst layer can be coated with the layer of material with electron or hole conductivity. For use as a cathode case ground can be made of steel. 5 C.p. f-crystals, 1 Il.

The invention relates to cathodic protection of objects against corrosion and electrochemical clicks the content, moisture, strength and other properties. The object of the invention is one of the main working bodies, are most susceptible to wear and tear, physical-chemical processes electrodialysis, electro-osmosis and electrophoresis, which may find wide application, in particular for the cleaning of silt, soil and other objects from contamination (for example, for regeneration of the sludge used for purification of water for urban water supply stations).

Known anode earthing [1] contains the current lead and electrodes connected in series, each of which is designed as concentric spaced rod and the metal housing, the space between which is filled with conductive material.

The lack of the anode [1] rapid dissolution of the anode material in aggressive environments.

As a prototype used anode earthing [2] in which a titanium hollow body, covered inside and out with a special catalyst, is connected with coaxial cable by crimping sleeves at the ends of the housing and along the length of the anode (due to the unreliability of the crimp contact with the film-forming catalytic material, the contact repeatedly duplicated).

Disadvantages Italy, resistant to aggressive environments, however, relate to the film-forming materials, the oxides of which are not electrically conductive) the entire surface of the body, both internal and external cover layer of the catalyst of andmounting insoluble material (ruthenium dioxide, compounds of iridium and other metals). This expensive material on the inner surface of the housing of the prototype is applied excessively, because it is only needed in places crimping sleeves inside a housing that is defined by way of the electrical contact device. Any leakage of the body due to corrosion, due to temperature fluctuations, mechanical damage and other reasons, will reduce the service life of the anode and to the pollution of the environment thanks to corrosion of the cable, in order to avoid requiring an increase in the thickness of the titanium or tantalum body.

For corrective [1] and [2] proposed to apply the catalyst only on the outer surface of the housing, the electrical contact of the inner surface with the sleeve to make contact welding, and available internal cavity of the housing filled with insulating compound; on the contact surface of titanium cor the of; on top of the catalyst layer may be covered with a layer of metal or other conductor with electronic or perforated conductivity (for example, magnetite, polymer concrete with high content of graphite and other); using the proposed ground as the cathode, the housing may be made of steel.

The device illustrated in the drawing, which is in the range 1 shows the input cable, on which are strung like beads linear (circles 2 and 3) and the terminal (in round 4) electrodes. Each electrode is made of titanium or tantalum thin-walled casing 5, is covered outside of the catalyst (ruthenium dioxide or other ) 6 to provide electrical conductivity from the housing 5 to the electrically conductive filling 7 (coke, activated carbon or other) held-permeable cloth 8 inside a perforated flexible tubing (sleeve) 9. On top of the catalyst to increase service life and reduce consumption of precious metals is applied to the conductor layer, resistant to conditions of work. Lived 10 cable tinned copper twisted wire is electrically and chemically resistant insulation respectively 11 and 12. Directly on the conductor 10 is installed by crimping a split sleeve 13. The free space between the outer for the ladies. Outside the housing 5 is installed crimp ferrule 15. Electrical contact between the housing 5 and the sleeve 13 is provided with contact welding 16, which produces a pass current with the appropriate options from the core of the cable 10 to the housing 5 after compression ring 15, and the contact face of the chassis 5 crimp ring 17, and the anode end of the earthing switch is closed by crimping the plugs 18 after filling vacant cavities of the housing 5 with an insulating compound 14. This sleeve 13 transmits the compound of the through grooves 19.

Instead of the catalyst layer on the inside surface of the housing 5 (the place of the contact plugs 13 to the housing 5 may be coated with the layer of copper or other electrically conductive material by a method of friction coating. For this purpose, the corresponding belt body cleanse brush consisting of steel and copper wires. When this steel wires make scratches on the surface of the body, which are filled with a soft metal wires (copper). Thereby obtaining the conductive layer that protects the titanium from the oxide film, sufficient to provide electrical contact as by crimping and contact welding.

To use earth as a cathode in the systems obwodnica with electron or hole conductivity. Optionally, in any embodiment of the ground to increase the surface of the electrode and fixation of the processed media impurities earthing is placed in a flexible perforated casing pipe with a large surface pores filled with a porous carbon material. During operation, if necessary, this layer moisten with water.

The device operates as follows.

Electric current, acting with input 1 from the conductor 10 of the cable, protected electrical 11 chemical resistant 12 insulations, goes to the sleeve 13 and through it by welding 16 in block 5 of the electrodes and earthing switches 2, 3 and 4. Thanks to the catalyst 6 electric current comes from the whole surface of the shell 5 in the conductive backfill material 7, which may go on fluid through the permeable fabric 8 and the perforated wall of the pipe (sleeve) 9. The internal cavity of the electrodes are protected in case of fracture of the body of insulating compound 14, penetrating and sleeve 13 and the grooves 19 to compression rings 15, 17 and 18.

A new set of essential features showing a new technical effect, and it allows in terms of unavailability of electric mates housing and cable to ensure reliable electric Kpovati them in a fundamentally new technologies multiple mobile use, when the electrodes are in the form of a wound on the coil pipe deploy, for example, on the infected location and hold it clean, and then taken to other areas.

The use of the proposed device can significantly reduce the processing time environments, reduce capital costs, eliminate pollution and contamination of the environment in the process of cathodic protection to increase the life of plants.

Revealing the sign ".on top put a layer of catalyst material.", note that this can be done by electroplating (e.g., magnetite) by filling graphite, coke and other material with subsequent binding, by coating cured concrete or other pasty mass with steel, copper and other chips.

1. Anode earthing containing the current lead, concentrically arranged cable housing with a catalytic coating and the contact plug, and the connection ends of the housing with the cable is airtight, characterized in that the catalytic coating is performed only on the outer surface of the housing, the connection of the inner surface of the housing sleeve is made through welding, and the free internal cavity of the titanium housing of the registry office with the contact sleeve is made by way of a friction applying a layer of metal.

3. Earthing on p. 2, characterized in that the quality of the metal used is copper.

4. Earthing under item 1, characterized in that on the outer side of the catalytic coating is a layer of material with electron or hole conductivity.

5. Earthing under item 1, characterized in that the casing is made of titanium.

6. Earthing under item 1, characterized in that the casing is made of steel.

 

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