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above 2 atmospheres
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as high as 150 atmospheres
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Publication
_________________________________________________________________
Number GB402423A
i»?
Title
_________________________________________________________________
EN Title Process for the electrical separation of suspended particles
from gaseous fluids
Abstract
_________________________________________________________________
<PICT:0402423/III/1> In a process for the electrical separation of
suspended
particles
from gases by means of a non-homogeneous
non-discharging field, the gases are treated under superatmospheric
pressure.
It is stated that the use of increased gas pressure enables a greater
potential difference to be applied to the electrodes without the
formation of a discharge, thus increasing the electrical forces acting
on the particles.
According to the arrangement shown, the gases are passed through a
chamber 1, the walls of which are sufficiently thick to withstand the
operating pressure, and between the tubular collecting electrode 2 and
the
high-tension
electrode 3 which may be a rod of such a
cross-section, size and shape that no discharge occurs.
The insulators 5 and 7 are
intermediate walls 14 and 15.
isolated
from
the gas stream by the
The pressure employed is preferably above 2 atmospheres and may be as
high as 150 atmospheres .
Description
_________________________________________________________________
L L LALXN UPATENT SPECIFICATION
Application Date: May 23, 1932 No 14,633/32.
402,423 Complete Accepted: Nov 23, 1933.
COMPLETE SPECIFICATION.
Process for the
Gaseous Fluids.
Electrical
Separation
of Suspended Particles from
(A Communication to us from abroad by the SIEMEY S-S c H Uci
KERTWER:E, AMTIENGESELLSCHAF/T, of Berlin-Siemenstadt, Germany, a
German Company).
We, LODGE-COTTRELL LIMITED, of George Street (Parade), Birmingham, a
British Company, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:
This invention relates to a process for the electrical precipitation
of suspended p rtieles from gaseous fluids with the aid Fii a
non-lhomogoenieous electrical field The
1 ini a non-homogeneous electrical field -.luloyed he'fein is intended
to denote a fi hi 1 such as obtains for instance in an r: lied
cylindrical pipe having a wire disilrlre electrode suspended axially
therein and connected to a source of high tencurrent or in the case of
a wire charge electrode opposing an earthed lz-ne surface The field
intensity in such
2 o ' ase will be greatest in the immediate vicinity of the wire and
will gradually decrease as the field spreads out towards the earthed
cylindrical pipe or plane surface.
It is known to separate suspended particles from gases by passing the
gas ihlough a non-lhom-nogeneouis electrical field established between
electrodes supplied with current of too low a potential lo produce
either a coronea discharge or a brush discharge Impelled by the forces
Of the 'clectrical gradient, the suspended particles will migrate to
the electrode with the higlher field strength In practiee it has been
found that while a separa4 C tion of suspended particles can be
achieved in this way, from a technic-al point of view the method is
often unsatisfactory, and for this reason this method has been
abandoned.
4 At The present invention aims at substantially improving the
electrical precipitati Onl effect of the afore-described process.
It
has
been
ascertained
that
the
electrical forces in a
non-homogeneous field due to the gradient, which are comparatively
small at normal pressure, can be increased very considerably if the
gas pressure be increased, since an increased pressure enLp-iice 11-1
ables a correspondingly increased potential to be employed, giving
rise to in 55 creased electrical forces, the increase in such
electrical forces being, in fac,, approximately proportional to the
increase in gas pressure.
According to the present inven 60 tion, th'erefore, the gas to be
cleaned is passed through a nonhomogeneous non-discharging electric
field at increased pressure In this way a better separation of the
suspended par 65 tieles can be obtained.
It has moreov'er been found that in the case of a gas containing
relatively small particles of dust, such small particles are brought
into closer proximity by an in 70 crease of the gas pressure, with the
result that agglomeration and flocculation of the dust takes place
Such agglomerated relatively coarse particles can be more readily
separated in the electrical field 75
The non-homogeneons non-discharging electric field is preferably
located inside a container capable of withstaniding high pressure
Since the volume of the gases decreases with the pressure the
dimensions 80 of such a container or pressure vessel may be relatively
small In spite of the reduced dimensions of the container or
precipitating chamber, it is possible to give sufficient time of
treatment for a very 85 effective separation of the suspended
particles to be achieved.
Tile voltages employed in the herein described process are of the same
order of mac, nitucle as those at present usual in go the art of
'electrical precipitation with the aid of a non-discharging electrical
field.
The pressure which may be employed
invention may vary within extremely
between about 2 and 150 atmospheres .
in carryin out the present
wide limits, for 95 example
Tn order more clearly to understand the invention reference is made to
the accompanlying drawing, which illustrates by 100 way of 'example
and in cross section, one embodiment of apparatus suitable for
carrying the invention into practical effect.
In said drawing, 1 denotes a tubular io 5 chamber the walls of which
are so thick CPC \ 1 ' 402,423 that it can withstand the operating
pressure employed Coaxial with th'e casing 1 is a tubular collecting
electrode 2 and axially of the chamber 1 and collecting electrode 2 is
a high -tension electrode 3 formed as a rod or the like of such a
cross section and of such size and shape thatthis electrode is
non-discharging The electrode 3 is suspended from the insulator 4
secured to a plate 5 closing ohe 'end of the casing 1 At its other end
the electrode 3 is mounted on a horizontal rod 6 carried bya a
insulator 7 arranged in a lateral climber 8:1 ' The gas t Q be
purifled, after having been cornpressed to the req:iisite high
pressure by a compressor or the like, is introduced into the lateral
opening 9 of the elfectrical precipitator and passes in the direction
of the arrow through the annular space between the electrode 3 and the
collecting electrode 2, issuing from the chamber 1 through the branch
10 Any dust precipitated on the collecting electrode 2 falls into a
hoppter bottom 11, out of which it can be removed through an outlet 12
controlled by a valve or the like 13.
The insulator 5 is isolated from the gas stream by means of an
intermediate wall 14 and a similar intermediate wall 15 30 protects
the insulator 7.
Having now particularly described and ascertained the nature of our
said invention and in what manner the same is to be performed, we
declare that what we 35
Claims
_________________________________________________________________
claim is:1) A process for the electrical separationi of-sttspehded particles
from gases by means of a non-homogeneous non-discharging electrical
fi'eld, in which the gas 40 is treated in the electrical field under
super atxnospheric pressure.
-), Apparatus for carrying out the, process set forth-in claim 1, in
which the non-homonitgeouts electrical field is located 45 inside a
vessel capable of withstanding high pressure.
3) The process for the electrical separation of suspended particles
from gaseous fluids, substantially as described 50 Dated this 23rd day
of May, 1932.
ALBERT L MOND, 19 outhampton Buildings, Chancery Lane, London, W C 2,
Agent for the Applicants.
Redhill: Printed for F Ms Majesty's -Stationery Office, by Love &
Malcomson, ltd -1933 _
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