Improvements in Apparatus for Washing and Purifying Gas.
Year: 1893

page_text: Date of Application, 24th Nov., 1893
Complete Specification Left, 3rd Apr., 1894-Accepted, 5th May. 1894
.
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Washing and Purifying Gas.
I, FREDERICK DEACON MARSHALL, of Philippa Vei 8, Copenhagen, in the
Kingdom of Denmark, Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to an improved apparatus for removing tar and ammonia
from coal gas.
My improved apparatus comprises a washing chamber and what 1 term an
impact chamber provided with a tar extracting bell as hereinafter more particularly
described. The washing chamber which is placed at the bottom of the apparatus
has passing through or formed within it a pipe having a downwardly projecting
opening which is closed by a water seal so that the gas which enters the washing
chamber through the said pipe has to pass through the water whereby the ammonia
and a portion of the tar is extracted. The washing chamber communicates with
the impact chamber through a vertical tube over which the tar extracting bell is
placed. This tar extracting bell is formed with two concentric walls made in
sections, each section being a plate provided with a series of vertical slits or
openings corresponding with the height of the bell. In front of these openings is
placed a second plate similarly perforated and so arranged that the perforations of
one plate are opposite the perforations of the other plate.
In the slits or openings of the first plate are placed vertical bars in such a manner
that the gas which passes through the said slits or openings will be divided into
two streams and be caused to impinge against the opposing or second plate so that
the gas in flowing through the sections will deposit its tar upon the opposing
surfaces.
The tar extracting bell is carried by a rod and is counterbalanced so that the
said bell can rise and fall according to the varying pressure of the gas whereby the
walls of the bell will be alternately immersed in and lifted out of the water
surrounding the vertical tube through which the gas passes from the washing
chamber to the impact chamber. Telescopic tubes are arranged around the rod
carrying the bell so as to prevent the escape of gas around the said rod. Suitable
discharge openings are provided at both the bottoms of the impact chamber and
the washing chamber for enabling the washing water to be removed, and a pump or
other apparatus is provided for introducing water into the said chambers so that a
continual change of the washing liquid takes place.
Dated the 24th day of November 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Washing and Purifying Gas.
I, FREDERICK DEACON MARSHALL, of Phillippa Vei 8, Copenhagen, in the
Kingdom of Denmark, Engineer, 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 apparatus for removing tar and ammonia from coal-gas
and especially to the apparatus known as Drory's tar-washer.
Such apparatus comprises a washing chamber placed at the bottom of the apparatus
and having passing through or formed within it a pipe having a downwardly projecting
[DQJ7

page_text: opening which is closed by a water seal so that the gas which enters the washing
chamber through the said pipe has to pass through the water whereby the ammonia
and a portion of the tar is extracted; and an impact chamber communicating
with the washing chamber through a vertical tube over which a tar extracting bell
is placed.
According to my invention this tar extracting bell is formed with two concentric
frames having the walls carried thereby made in sections, each section being
provided with a series of vertical slits or openings. In front of these openings is
placed a plate having similar slits or openings so arranged that they are out of line
with the other set of slits or openings. In the first mentioned slits or openings are
placed vertical bars in such a manner that the gas which passes through the said
alits or openings will be divided into two streams and be caused to impinge against
the opposing or second plate so that the gas in flowing through the sections will
deposit its tar upon the opposing surfaces.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which :-
'
Figures 1 and 2 are central vertical sections at right angles to each other of a
Drory tar-washer having my improvements applied thereto, certain parts shewn in
Figure 1 being omitted from Figure 2:
Figure 3 is a section on the line 3-3, Figure 1:
Figure 4 is an elevation drawn to an enlarged scale of one of the sections of the
tar extracting bell; and,
Figures 5 and 6 arc sections on the lines 5-5 and 6-6 respectively of Figure 4.
a is the washing chamber, the pipe baving the downwardly projecting opening
therein, and c the impact chamber which is connected with the washing chamber a
through the vertical pipe d, all of which parts being of ordinary construction
require no further description.
to
e is my improved tar extracting bell which is advantageously made of octagonal
shape and provided with two concentric frames f, f, each carrying eight wall
sections. Each of these sections comprises a front plate g the sides of which are
flanged and adapted to slide in guides h, h formed in the octagonal framing of the
bell (as shewn most clearly in Figure 6) and the top edge of which is also adapted
pass beneath or behind the plate i, as shewn in Figures 4 and 5, the said plate
being rivetted to the frame f. Behind the plate g is placed a series of channelled
bars j,j, the said bars being so arranged that spaces forming slits, are left between
their adjacent edges and also between their edges and the plate g. These bars j, j
are held in position by rivetting them to two cross-bars k, k which are themselves
rivetted to the plate g.
In the spaces between the adjacent edges of the channelled bars j, j are fixed
the metallic strips 1, 1, Figure 6, the said strips serving to divide the streams of gas
issuing between the channelled bars. These strips 1, when inserted are held in
place by a piece of angle iron m secured to the frame f as shewn in Figures 4
and 5.
This tar extracting bell is carried in the usual manner by a rod the weight of
which together with the bell is counterbalanced so that the said bell is alternately
immersed in and lifted out of the water surrounding the vertical pipe d in the usual
manner.
With the construction hereinbefore described it will be understood that the
streams of gas passing from the inside of the bell to the outside, through the spaces
or slits between the edges of the channelled bars j, j will be divided by the strips, l
such divided streams impinging against the plate g before escaping through the slits
therein.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In apparatus of the kind herein before described for washing and purifying

page_text: gas, the use of a tar extracting bell having slits formed therein through which the
gas passes, an opposing plate having openings therein, against which plate the gas
passing through the said slits impinges and strips for dividing the streams of gas
passing through such slits, substantially as described.
2. The manufacture and use of the improved apparatus for washing and
purifying gas hereinbefore described and illustrated in the accompanying
drawings.
1
11001
G. F. REDFERN & Co.,
4, South Street, Finsbury; London, Agents for the Applicant.