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Publication numberUS3773966 A
Publication typeGrant
Publication dateNov 20, 1973
Filing dateFeb 26, 1973
Priority dateMar 2, 1972
Also published asDE2209999A1, DE2209999B2
Publication numberUS 3773966 A, US 3773966A, US-A-3773966, US3773966 A, US3773966A
InventorsEbert H, Kampmann F, Thummler U, Werner H
Original AssigneeKnapsack Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Lead-in-device passing a conductor through the cover of an electrical precipitation apparatus
US 3773966 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent [191 Ebert et al.

[ Nov. 20, 1973 I LEAD-IN-DEVICE PASSING A CONDUCTOR THROUGH THE COVER OF AN ELECTRICAL PRECIPITATION APPARATUS [75] Inventors: Hans Ebert, Hurth-Efferen;

Friedrich Wilhelm Kampmann; Ursus Thummler, both of Erftstadt Liblar; Hugo Werner, l-Iurth-Hermulheim, all of Germany [73] Assignee: Knapsack Aktiengesellschaft,

Knapsack near Cologne, Germany 22 Filed: Feb. 26, 1973 21 Appl. No.: 335,598

[30] Foreign Application Priority Data Mar. 2, 1972 Germany P 22 09 999.6

[52] US. Cl 174/3l.5, 55/120, 55/146, 174/12 BH [51] Int. Cl B03c 3/34, l-lOlb 17/26 [58] Field of Search 174/12 BH, 14 BH,

174/15 BH, l6 BH, 18, 31 R, 31.5; 55/120, 140,146,148

[56] References Cited UNITED STATES PATENTS 3,595,983 7/1971 Muller et a1. 174/31.5 3,627,898 12/1971 lbach et a1. 174/31.5 X

Primary Examiner-Laramie E. Askin Attorney-Arthur G. Connolly et al.

[57] ABSTRACT Lead-in-device receiving a conductor which passes through the cover of an electrical precipitation apparatus and down to its electrode system, the electrical precipitation apparatus being used in the production of phosphorus. A middle portion of the conductor is concentrically surrounded by a duct and a sealing cup is disposed above the cover of the electrical precipitation apparatus concentrically with respect to the conductor. Above the sealing cup, the conductor is encircled by an insulator which is radially spaced therefrom and above the insulator, the conductor is concentrically surrounded by a bellows, of which the upper end is fast with the conductor. An annular chamber is disposed between the insulator and the bellows, the lower surface of the said annular chamber being apertured to provide passages, whereby a gaseous medium can be continuously supplied to the annular space between the said insulator and the said conductor. Elastic packing rings provide seals between the insulator and the annular chamber situated above it, and between the insulator and the sealing cup situated below it, and spring pressed elements urge the annular chamber into contact with the insulator, the spring-pressed elements having mountings which bear against crossmembers fast with the conductor.

9 Claims, 1 Drawing Figure United States Patent 1 [111 3,773,966

Eb'ert et al. Nov. 20, 1973 LEAD-lN-DEVICE PASSING A CONDUCTOR THROUGH THE COVER OF AN ELECTRICAL PRECIPITATION APPARATUS The present invention provides a lead-in device receiving a conductor which passes through the cover of an electrical precipitation apparatus and down to its electrode system, the precipitation apparatus being used in the production of phosphorus, wherein a middle portion of the conductor is concentrically surrounded by a duct; wherein a sealing cup is disposed above the cover of the electrical precipitation apparatus concentrically with respect to the conductor; wherein, above the sealing cup, the conductor is encircled by an insulator which is radially spaced therefrom; and wherein, above the insulator, the conductor is concentrically surrounded by a bellows, of which the upper end is fast with the conductor.

A lead-in device receiving a conductor which passes through the cover of an electrical precipitation apparatus has already been described, wherein the conductor, housed in a duct arranged concentrically therewith, is surrounded by an insulator, which is positioned above the corner of the electrical precipitation apparatus and is radially spaced from the conductor, and wherein an insulating bush is mounted on the conductor, the insulating bush being surrounded by a barrier disc so as to leave a narrow gap therebetween. In this device, the insulator, the insulating bush and the barrier disc are conveniently of polytetrafluoroethylene. Positioned above the insulator is a bellows, of which the lower and upper ends are fast with the insulator and conductor, respectively. The space between the bellows, the insulator, the barrier disc and the insulating bush is occupied by a sealing gas maintained under overpressure. Arranged concentrically around the conductor and positioned between the duct and the cover of the electrical precipitation apparatus is a sealing cup, of which the lower portion conveniently has water therein and of which the upper portion provides a pipe connection running to a chimney.

A difficulty encountered during the operation of the above lead-in device is that the surfaces of the insulator, the insulating bush and the barrier disc, which as just mentioned are conveniently of polytetrafluoroethylene, are rapidly contaminated, and thereby rendered electrically conductive, by dust particles which are ejected from the electrical precipitation apparatus as a result of pressure variations therein; this difficulty is encountered despite the use of nitrogen, for example, as an incombustible sealing gas. This superficial contamination has even been found to lead in many cases to the destruction of these relatively costly insulating elements, due to continual electric flash-overs.

It is accordingly an object of the present invention to provide a lead-in device receiving a conductor which passes through the cover of an electrical precipitation apparatus, which device is free from the disadvantages referred to above and makes it possible for the high voltage applied to the conductor to produce corona currents in the electrical precipitation apparatus, avoiding wasteful currents leaking over the surfaces of the insulating elements.

According to the present invention, we provide a lead-in device receiving a conductor which passes through the cover of an electrical precipitation apparatus and down to its electrode system, the electrical precipitation apparatus being used in the production of phosphorus; wherein a middle portion of the conductor is concentrically surrounded by a duct and a sealing cup is disposed above the cover of the electrical precipitation apparatus concentrically with respect to the conductor; wherein, above the sealing cup, the conductor is encircled by an insulator which is radially spaced therefrom; and wherein, above the insulator, the conductor is concentrically surrounded by a bellows, of which the upper end is fast with the conductor; the lead-in device comprising: an annular chamber disposed between the insulator and the bellows, the lower surface of the said annular chamber being apertured to provide passages whereby steam or another gas vapour can be continuously supplied to the annular space between the said insulator and the said conductor; elastic packing rings which provide seals between the insulator and the annular chamber situated above it, and between the insulator and the sealing cup situated below it; and spring-pressed elements urging the annular chamber into contact with the insulator, the springpressed elements having mountings which bear against cross-members which are fast with the conductor.

Preferred features of the lead-in device of the present invention, which can be used singly or in combination, provide:

a. for the insulator to be of quartz, or

b for the insulator to be of quartz glass, or

c for the insulator to be of polytetrafluoroethylene;

d for the insulator to have a length equal to its internal diameter, or

e for the insulator to have a length larger than its internal diameter;

ffor the annular chamber to have a pipe connection connecting the annular chamber to supply means for steam or another gas or vapour, through an insulating joint; and

g for the insulating joint to have a length equal to the internal diameter of the insulator, or

h for the insulating joint to have a length larger than the internal diameter of the insulator.

In the lead-in device of the present invention, the insulatorcan be a plain cylinder of quartz, quartz glass or polytetrafluoroethylene, with no attachments. As a result, it is possible for the purchase, assembly and maintenance costs to be reduced substantially by 50 percent, compared with the costs of known lead-in de vices. To avoid the deposition of, for example, condensed phosphorus and/or impurities containing phosphorus and carbon, on the surface of the insulator, use should preferably be made of a system whereby steam ,at to C is caused to flow into the interior of the insulator. If contaminating material should ever de posit on the insulator, for example, as a result of a breakdown in the steam supply system, it is possible for the inside of the insulator to be rapidly rinsed, the power to the electrical precipitation apparatus being switched off, using as a rinsing means the condensed water which is at first produced once the supply of steam is resumed. Following this, the rising steam temperatures effect drying of the insulator, and restore its full insulating properties.

In addition to this, the steam flowing through the insulator and the duct into the electrical precipitation apparatus has been found favorably to influence the separation of dust, in the electrical precipitation apparatus.

An embodiment of the device of the present invention is shown diagrammatically (generally in axial section) in the single FIGURE of the accompanying drawmg.

As can be seen from the FIGURE, a conductor 1 is arranged to project through a cover 2 down to the electrical system of an electrical precipitation apparatus 3. The conductor 1 is surrounded by a duct 4 projecting, from a level above the cover 2, into the interior of the electrical precipitation apparatus 3. Above the duct 4, the conductor 1 is surrounded by a cylindrical insulator 5, which is radially spaced therefrom and of which the lower end is sealed by an elastic packing 6 which is supported by an upper flange provided on a bell-shaped member 14 forming an inner part of a sealing cup 12. At the upper end of the insulator 5, which is also sealed by an elastic packing 6, is an annular chamber 9 of which the lower surface is apertured to provide outlets 11. The annular chamber 9 is urged towards the insulator by spring-pressed rods 7 mounted in sleeves which bear against cross-members 19 fast with the conductor 1. The annular chamber 9 is further provided with a pipe connection 10 opening laterally thereinto. The pipe connection 10 and an insulating joint 8 connect the chamber 9 to a conduit 21 supplying steam, for example. Disposed above the annular chamber 9 is a bellows which is secured at its lower end to a flange provided on the chamber 9 and is secured at its upper end to the conductor 1. 4

The bell-shaped member 14 is arranged so as to open out into the sealing cup 12, its upper end passing through the cover 13 of the sealing cup 12. The lower portion of the sealing cup 12 contains a sealing liquid 15, for example water, which is supplied thereto through an inlet 17 and removed therefrom through an outlet 16. The upper portion of the sealing cup 12 has an off-gas connection 18 running to a chimney.

The claims:

1. Lead-in device receiving a conductor which passes through the cover of an electrical precipitation apparatus and down to its electrode system, the electrical precipitation apparatus being used in the production of phosphorus; wherein a middle portion of the conductor is concentrically surrounded by a duct and a sealing cup is disposed above the cover of the electrical precipitation apparatus concentrically with respect to the conductor; wherein, above the sealing cup, the conductor is encircled by an insulator which is radially spaced therefrom; and wherein, above the insulator, the conductor is concentrically surrounded by a bellows, of which the upper end is fast with the conductor; the lead-in device comprising: an annular chamber disposed between the insulator and the bellows, the lower surface of the said annular chamber being apertured to provide passages whereby steam or another gas or vapour can be continuously supplied to the annular space between the said insulator and the said conductor; elastic packing rings which provide seals between the insulator and the annular chamber situated above it, and between the insulator and the sealing cup situated below it; and spring-pressed elements urging the annular chamber into contact with the insulator, the springpressed elements having mountings which bear against cross-members which are fast with the conductor.

2. Lead-in device as claimed in claim 1, wherein the insulator is of quartz.

3. Lead-in device as claimed in claim 1, wherein the insulator is of quartz glass.

4. Lead-in device as claimed inclaim 1, wherein the insulator is of polytetrafluoroethylene.

5. Lead-in-device as claimed in claim 1, wherein the insulator has a length equal to its internal diameter.

6. Lead-in-device as claimed in claim 1, wherein the insulator has a length larger than its internal diameter.

7. Lead-in-device as claimed in claim 1, wherein the annular chamber has a pipe connection connecting the annular chamber to supply means for steam or another gas or vapour, through an insulating joint.

8. Lead-in-device as claimed in claim 7, wherein the insulating joint has a length equal to the internal diam eter of the insulator.

9. Lead-in-device as claimed in claim 7, wherein the insulating joint has a length larger than the internal diameter of the insulator.

l i l

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4193774 *Sep 17, 1978Mar 18, 1980Pilat Michael JElectrostatic aerosol scrubber and method of operation
US4204844 *Apr 6, 1978May 27, 1980Pilat Michael JLiquid transfer system for conductive liquids
US4251682 *Mar 28, 1980Feb 17, 1981Hoechst AktiengesellschaftOperation of a lead-in-device receiving a conductor passed through the cover of an electrical precipitation apparatus
US4256468 *Jul 13, 1979Mar 17, 1981Bethlehem Steel CorporationMethod for cleaning sinter plant gas emissions
US4578088 *Dec 17, 1984Mar 25, 1986Fmc CorporationElectrical insulating and sealing apparatus and process for using same
US9333513 *Nov 18, 2010May 10, 2016Beat MullerElectrostatic fine dust filter system, retainer for an electrode, and electrode therefor
US20140083297 *Nov 18, 2010Mar 27, 2014Beat MullerElectrostatic fine dust filter system, retainer for an electrode, and electrode therefor
Classifications
U.S. Classification96/50, 174/31.5, 96/88, 174/12.0BH
International ClassificationB01D35/06, B03C3/66, B03C3/34, B03C3/70
Cooperative ClassificationB03C3/70
European ClassificationB03C3/70