IMPROVE- MENTS IN APPARATUS FOR PURIFYING ILLUMINATING AND OTHER GASES
Year: 1881

page_text: LETTERS PATENT to Robert Good, of Carshalton, and Thomas Dean, of
Croydon, both in the County of Surrey, for an Invention of "IMPROVE-
MENTS IN APPARATUS FOR PURIFYING ILLUMINATING AND OTHER GASES."
PROVISIONAL SPECIFICATION left by the said Robert Good and Thomas
Dean at the Office of the Commissioners of Patents on the 26th May 1881.
ROBERT GOOD, of Carshalton, and THOMAS DEAN, of Croydon, both in the
County of Surrey. "IMPROVEMENTS IN APPARATUS FOR PURIFYING ILLUMINATING
AND OTHER GASES."
This Invention has for its object improvements in apparatus for purifying
illuminating and other gases.
For washing coal and other gases to absorb and extract ammonia and other
products from it, we cause the gas to be projected downwards through numerous
small tubes into water or other liquid capable of absorbing, extracting, or combining
with the impurities to be removed. We also arrange the apparatus in such a way
that this operation is repeated several times, and that the gas as it issues from
the apparatus is acted upon last by water or liquid containing but little
impurity.
For this purpose we form the apparatus with a number of shallow tanks or
chambers ranged one above the other for containing the water or other liquid.
Above the water level of each tank or chamber is a hollow chamber. The bottom
of this chamber is a short distance above the water level, and there are numerous
small tubes projecting downwards from the bottom of the chamber, and dipping
into the water or liquid below it.
The gas to be purified is led into the lowest chamber, and passes from it through
the numerous small tubes into the liquid in the lowest tank, and rising up from
this liquid it enters the chamber next above it, and so into the liquid in the second
tank, and so on until it has been passed into the liquid in all the tanks or chambers,
and is conducted away by au outlet pipe. The tubes dipping into the liquid in
the top chamber are subdivided into numerous small passages.

page_text: An overflow pipe is provided from the highest tank to the tank next below it,
and its end is made to dip below the surface of the water or liquid in this tank.
In a similar manner there is an overflow from each tank to the one next below it,
and finally from the lowest tank to a receptacle in which the impure gas liquor is
collected.
Fresh water may be admitted continuously to the highest tank, and gas liquor
allowed to flow off continuously from the lowest tank; or the liquor may after a
time all be drawn off from the lowest tank, and this tank be then filled from the
tank above it, and so on for the rest of the tanks, whilst the highest tank is filled
with pure water or liquid.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Robert Good and Thomas Dean in the Great Seal Patent Office
on the 25th November 1881.
ROBERT GOOD, of Carshalton, and THOMAS DEAN, of Croydon, both in the
County of Surrey. "IMPROVEMENTS IN APPARATUS FOR PURIFYING ILLUMINATING
AND OTHER GASES."
This Invention has for its object improvements in apparatus for purifying
illuminating and other gases.
For washing coal and other gases to absorb and extract ammonia and other
products from it, we cause the gas to be projected downwards through numerous
small tubes into water or other liquid capable of absorbing, extracting, or combining
with the impurities to be removed. We also arrange the apparatus in such a
way that this operation is repeated several times, and that the gas as it issues
from the apparatus is acted upon last by water or liquid containing but little
impurity.
The
For this purpose we form the apparatus with a number of shallow tanks or
chambers ranged one above the other for containing the water or other liquid.
Above the water level of each tank or chamber is a hollow chamber.
bottom of this chamber is a short distance above the water level, and there are
numerous small tubes projecting downwards from the bottom of the chamber, and
dipping into the water or liquid below it.
The gas to be purified is led into the lowest chamber, and passes from it through
the numerous small tubes into the liquid in the lowest tank, and rising up from
this liquid it enters the chamber next above it, and so into the liquid in the second
tank, and so on until it has been passed into the liquid in all the tanks or chambers,
and is conducted away by an outlet pipe.
The tubes dipping into the liquid in the top chamber are subdivided into numerous
small passages.
A trapped overflow is provided from each tank to the one next below it, and
finally from the lowest tank to a receptacle in which the impure gas liquor is
collected.
Fresh water may be admitted continuously to the highest tank, and gas liquor
allowed to flow off continuously from the lowest tank; or the liquor may after a
time all be drawn off from the lowest tank, and this tank be then filled from the
tank above it, and so on for the rest of the tanks, whilst the highest tank is filled
with pure water or liquid.
In order that our Invention may be fully understood we will proceed to describe
the Drawings hereunto annexed.
Figure 1 shews a vertical section of a gas purifying apparatus constructed
according to our Invention; Figure 2 is another vertical section of the same taken
on a different plane; Figure 3 is a horizontal section taken through the line a, b,
Figure 1.
A is an outer cylindrical casing, which by horizontal divisions B is divided into
chambers or compartments one above the other, each serving as a tank. The
Drawing shews the casing to be thus divided into 5 compartments.
Each compartment is partially filled with water or other pnrifying liquid used.
Above the water level in each compartment there is a division plate C, from which
numerous small tubes D project downwards and dip into the liquid. Through each

page_text: division plates C an opening E is formed. Above this a tube or partition F is
secured, and it is carried up through the horizontal plate B above it, and up to an
opening in the next division plate which is above this plate B.
In the side of the tube or partition F is an oblong opening, which serves as an
overflow for liquid to pass from the upper to the lower tank or compartment. This
opening is covered with a hood or plate G, which dips down into the liquid and
prevents the passage of gas through the opening.
The bottom of each tank is by branch pipes H coupled with a vertical pipe I.
These pipes are provided with valves to allow of the liquor in any tank or chamber
being run off from it, or to allow of the liquor in any chamber or tank being
transferred to any other chamber or tank below it. Through the pipe I water or
liquid can also, if desired, be supplied direct to any of the tanks.
K is a trapped pipe, through which weak liquor may be introduced to the tank
next below the highest tank, so that the liquor may be used over again without
interfering with the pure water in the highest tank.
The inlet for gas is at L into the chamber above the partition C of the lowest
tank. It passes downwards through the tubes carried by this partition into the
liquid below, and rising up through the liquid passes off by the pipe or passage F
into the chamber above the partition C of the tank next above it, and so on until
it finally passes off by the outlet M. from the highest tank.
Preferably we place perforated plates or wire gauze at the bottom of the dip
tubes, which descend from the partition C of the highest tank, so as to divide the
gas into fine streams for its final washing. N is a trapped overflow pipe from the
lowest tank, by which liquor overflowing from the bottom tank is conveyed to
the tar well.
Having thus described the nature of our Invention, and the manner of performing
the same, we would have it understood that we claim, the combination of apparatus
for purifying illuminating and other gases, substantially as herein before described.
In witness whereof, we, the said Robert Good and Thomas Dean, have
hereunto set our hands and seals, this Twenty-fourth day of November, in
the year of our Lord One thousand eight hundred and eighty one.