An Improvement in the Construction of Gas Washers and Ammonia Stills.
Year: 1893

page_text: Date of Application, 24th Feb., 1893
Complete Specification Left, 23rd Nov.,. 1893-Accepted, 30th Dec., 1893
PROVISIONAL SPECIFICATION.
An Improvement in the Construction of Gas Washers and Ammonia
Stills.
1, EDWARD LLOYD PEASE, Managing Director, of Messrs. Ashmore Benson
Pease & Co. Ld. of Stockton-on-Tees do hereby declare the nature of this invention
to be as follows:→
The improvement relates to the construction of the trays in the apparatus so
that the steam or gas as the case may be may have a much larger discharging
area in each tray than.is provided in existing apparatus. To produce this the
trays have a number of parallel slits formed through them from side to side with. a
raised rim all around each slit leaving sufficient passage at alternate ends for the
passage of the water. Above each of these slits and the raised rim, around it.is
placed an inverted trough sufficient space being left between the raised rim and the
top and sides of the inverted trough for the passage of steam or gas.
In this way the steam or gas rising up through the slits gets deflected downwards
into the water on each side of the slits. The vessel is preferably rectangular and
may consist of as many trays as is desirable one above the other.
:
The usual method employed at the present time in ammonia stills is for the
discharging of the steam through roses, nozzles, or apparatus of that description
by which means the steam comes into immediate contact with a much smaller
portion of the water or liquor than by this improved arrangement.
By this arrangement also the liquor has to traverse a narrow. and absolutely
defined passage from its entrance to its exit from the vessel. By this means every
portion of the liquor entering is treated in a similar way by the steam and it is
not possible for any liquor to remain in the still longer than is necessary.
Dated this 24th day of February 1893.
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION..
An Improvement in the Construction of Gas Washers and Ammonia
Stills.
I, EDWARD LLOYD PEASE, Managing Director of Messrs. Ashmore, Benson
Pease & Co. Ld. of Stockton-on-Tees, 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 :-
i
The improvement relates to the construction of the trays in the apparatus so
that the steam or gas as the case may be may have a much larger discharging
area in each tray than is provided in existing apparatus. To produce this the
trays have a number of parallel slits formed through them from side to side with a
raised rim all around each slit leaving sufficient. passage at alternate ends for the
passage of the water. Above each of these slits and the raised rim around it is
placed an inverted trough sufficient space being left between the raised rim and
the top and sides of the inverted trough for the passage of steam or gas.
In this way the steam or gas rising up through the slits gets deflected downwards
into the water on each side of the slits. The vessel is preferably rectangular and
may consist of as many trays as is desirable one above the other.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a transverse section showing parts of three trays for a gas washer
or ammonia still in accordance with my invention.
a is the surface of the plate. bbare parallel slits formed in it. Figure 2 is a
diagram in which the arrangement of the slits in plan, is indicated.
ccare raised
rims around the slits. dd are inverted troughs fixed over the rims and above the
slits b. The trays of which any desired number one over the other may be
employed, are enclosed in a casing. The gas or vapour to be treated coming from
a gas main or from the generator of an ammonia still is admitted to the casing at
the bottom beneath the lowest tray and the gas outlet is from the top of the casing
above the uppermost tray. Water is admitted continuously upon the surface of
the uppermost tray say near one corner and it flows in a zigzag course over the
tray as the raised rims c direct. Then by a passage provided for the purpose the
water descends to the tray next below over which it flows in like manner and so on
until when it has passed over the surface of the lowest tray it is conducted away.
The edges of the inverted troughs (which may be serrated) dip into the water
and as near as may be every where to an equal depth, to ensure which allowance
should be made for the slightly higher level at which the water stands where it
enters upon the tray over that at which it stands when about to pass off. The gas
and vapour being under sufficient pressure as it passes upwards forces its way
under the edges of the troughs and through the water into which the troughs
dip; thus all soluble or condensible matters are effectually brought into contact with
the water and they are retained thereby; more especially so as the pure or fresh
water entering upon the top tray meets with gas which has been very much
purified by its passage through water upon the trays below.
The usual method employed at the present time in ammonia stills is for the
discharging of the steam through roses, nozzles, or apparatus of that description
by which means the steam comes into immediate contact with a much smaller
portion of the water or liquor than by this improved arrangement.
By this arrangement also the liquor has to traverse a narrow and absolutely
defined passage from its entrance to its exit from the vessel. By this means every
portion of the liquor entering is treated in a similar way by the steam and it is
not possible for any liquor to remain in the still longer than is necessary.
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. Trays substantially as described for gas washers and ammonia stills, such
trays having parallel slits, and ribs around the slits, arranged to direct in a zigzag
course the How of water admitted to the surface of the tray, and inverted troughs
over the slits and ribs which serve to bring gas and vapour ascending through the
slits into contact with the water upon the tray.
2. Apparatus substantially as described.
Dated thin 17th
LAT
1000