Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1984-08-10
1986-10-21
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
60311, 174152R, 174139, 55DIG30, B03C 306
Patent
active
046183515
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention relates to a device for cleaning of gases of electrically conductive particles, like soot and the like, in particular for cleaning exhaust gases of fossil fuels, like exhaust gases of Diesel motors.
In a known device of this type the articles contained in the gas, for example, soot particles in the exhaust gas of internal combustion engines are coagulated for an easier separation in filters, turbulence chambers, centrifuges and the like, which is performed by electrostatic charging of the particles or by embossing an influence charge on the particles. A high electric voltage is applied between the housing and the concentrically disposed metallic electrode of the coagulator for generating an electrical field in both cases. Electrically charged particles deposit into larger agglomerations which can be easily separated in the separator devices due to their size and their weight. A part of the agglomerates already deposits in the coagulator. After a while layers are formed by the conductive agglomerates on the insulator which assures the conduct of the electrode through the housing thus resulting in shorts and therefore the breakdown of the device. Consequently, frequent operating interruptions and maintenance operations do occur.
ADVANTAGES OF THE INVENTION
The device in accordance with the invention is advantageous in that agglomeration deposits, for example, soot layers forming on the insulator either burn off or are not even generated due to the annealing zone. Soot sublimes at a temperature higher than 400.degree. C., for example. The gas like sublimate is discharged together with the gas flow from the coagulator. Thus, the coagulator and thereby the total device are free from breakdowns and operable. The additional effort for the annealing zones in accordance with the invention is very low due to the simple mode of construction. Also, the required heating consumption is relatively low and is about 20 Watt per insulator in a realized device.
Thereby, the annealing zones in accordance with the invention can be realized in a simple, cost effective manner. Metals from the Wolfram and platinum group, nickel, gold and silver are particularly suitable as a material for thick layer heat conductivity paths, palladium as a metal for the insulator and ceramics are used for the cover layer of the annealing zone and the connecting lines (for example, Al.sub.2 O.sub.3), glass ceramics or glass, for example, Sio.sub.2 glass.
DRAWING
The invention is described in more detail in the following in conjunction with an exemplified embodiment illustrated in the drawing. The drawing shows:
FIG. 1 a longitudinal sectional view of a coagulator of a device for cleaning of exhaust gases of a Diesel motor
FIG. 2 a sideview of an insulator of the coagulator in FIG. 1.
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENT
The device for cleaning the exhaust gas of a Diesel motor of electrically conductive particles like, for example, soot particles, is provided with a coagulator 10 which is illustrated in a longitudinal sectional view and which is admitted by the exhaust gases of the Diesel motor and wherein an influence charge is embossed on the soot particles. Due to these influence charges the soot particles coagulate into larger agglomerates which can be easily filtered out due to their size and their weight in separators (not shown), like filter, turbulence chamber, centrifuge and the like. Such coagulators are disclosed, for example, in DE-OS No. 2,408,511 or U.S. Pat. No. 3,110,580.
The coagulator 10 illustrated in a sectional longitudinal section in FIG. 1 is provided with a cylindrical housing 11 and an electrode 12 which is concentrically disposed in housing 11. Electrode 12 is connected to the positive pole of a grounded high voltage source (not shown), while the housing 11 is grounded thus forming the counter electrode. Electrode 12 is maintained and guided in housing 11 by means of two insulators 13 in an insulated manner. FIG. 1 shows only the left side of the coagulator 10 and therefore onl
REFERENCES:
patent: 1099365 (1914-06-01), Henderson
patent: 1690135 (1928-11-01), Seekamp
patent: 3740925 (1973-06-01), Gothard
patent: 4116790 (1978-09-01), Prestidge
Patent Abstract of Japan 56-97561 6-8-81 Toyota Jidosa Kogyo K.K.
Esper Friedrich
Frey Thomas
Nozick Bernard
Robert & Bosch GmbH
Striker Michael J.
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