IMPROVEMENTS IN CONNECTION WITH APPARATUS FOR EXTRACTING TAR AND AMMONIA FROM THE GASES OF BLAST FURNACES
Year: 1884

page_text: I, JOHN DEMPSTER of The Gas Plant Works, Newton Heath, near Manchester,
Lancashire, Gas Engineer, do hereby declare the nature of my invention for
IMPROVEMENTS IN CONNECTION WITH APPARATUS FOR EXTRACTING TAR AND
AMMONIA FROM THE GASES OF BLAST FURNACES to be as follows :-
"
»
My invention has reference to certain apparatus employed in extracting tar and
ammonia from blast furnace gases, and where the gases are conveyed by pipes
through certain vessels and purifiers necessary for the process of extraction, and
ultimately the said gases are conveyed to the boiler flues, where they are ignited:
for the purpose of generating steam.
In the above named plant or apparatus for extracting the tar and ammonia, a
certain vessel is employed called the "ammonia liquor still" which vessel and tho
contents therein I intend to heat by means of the blast furnace gases, as soon as
they leave the furnaces, and prior to their being cooled by any of the processes of
extraction.
To do this I build or construct a flue around the outside of the liquor still,
through which the heated gases pass on their way to the extracting apparatuses,
being conveyed thither by suitable pipes; the heat of these gases which at this
point are very hot, immediately heats the still to the required temperature, by
which means the expense and trouble attending a furnace is avoided.
As the gases are blown through the conducting pipes, certain gritty or dusty
particles are blown away with the said gases, and in order to remove such
dusty particles from the gas, I arrange the flues around the liquor still of much
larger area than the conducting pipes so that the speed or force of the gases will
be lessened at this point; the effect of which will be, that the dust will descend
and drop to the bottom of the fluc, whereby the gas.goes forward, leaving the dust
behind in the bottom of the flue surrounding the "still," which dust is removed
therefrom by scrapers attached to endless travelling chains, or other form of
apparatus may be employed to remove the said dust, which is arranged to fall into
a pit formed at the end of the flue; suitable dampers being employed for opening
and closing the mouth of same when required to be emptied.
TASKER & CROSSLEY,
Waterhouse Street, Halifax,
Agents for the Applicant.

page_text: I, JOHN DEMPSTER of the Gas Plant Works Newton Heath, near Manchester
Lancashire Gas Engineer do hereby declare the nature of my invention for
"IMPROVEMENTS IN CONNECTION WITH APPARATUS FOR EXTRACTING TAR AND
AMMONIA FROM THE GASES OF BLAST FURNACES" and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :—
My invention has reference to certain apparatus employed in extracting tar and
ammonia from blast furnace gases, and where the said gases are conveyed by pipes
through certain vessels and purifiers necessary for the process of extraction and
ultimately conveying the said gases either to the boiler flues where they are ignited
for the purpose of generating steam, or to any stoves or apparatus requiring fuel.
In the above named plant or apparatus for extracting the tar and ammonia
a certain vessel is employed called the "ammonia liquor still" which vessel and
the contents therein I intend to heat by means of the blast furnaces gases as soon
as they leave the furnaces, and prior to their being cooled by any of the processes
of extraction.
To do this I build or construct a Blue around the outside of the liquor still
through which the heated gases pass on their way to the extracting apparatuses,
being conveyed thither by suitable pipes, the temperature of these gases which at
this point is very high, immediately heats the still to the required temperature by
which means the expense and trouble attending a furnace is avoided.
Such being the nature and object of my Invention I will now describe the same
illustrations of which are shewn on the accompanying. drawings wherein Fig 1 is
longitudinal section, Fig 2 sectional plan, Fig 3 cross section, and Fig. 4 end eleva-
tion of sulphate still having my improvements connected thereto. E is an ordinary
sulphate still employed in conjunction with other mechanism for the purpose of
extracting tar and ammonia from blast furnace gases.
This still I place in any suitable position and around it I build flues F and G,
so that the heated gases impinge against the outside of the still in order to heat
same to a suitable temperature. The gases from the blast furnaces are conducted
by pipes H to the mouth of the flue at I they then pass along the flue F through
the opening J and along the flue G, and finally pass to other parts of the extracting
plant. As the gases are blown through the conducting pipes H certain gritty
or dusty particles are blown away with the said gases, and in order to remove
such dusty particles from the gas. I form the flues F and G around the liquor
still of much larger area than the conducting pipes, so that the speed or force of
the gases will be lessened at this point, the effect of which will be that the dust
will descend and drop to the bottom of the enlarged flues whereby the gas goes
forward leaving the dust behind in the bottom of the flue surrounding the "still"
which dust is removed therefrom by scrapers L attached to endless travelling
chains M passing on grooved pulleys N driven by strap and pulley P, or other
forms of apparatus may be employed to remove the said dust, which is arranged

page_text: to fall into a pit R formed at the end of the flue, suitable dampers S being employed
for opening and closing the mouth of same when required to be emptied.
By these means the sulphate still can be heated by the spent gases from the
furnaces at a very small cost without the necessity of a separate furnace.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
Firstly In apparatus employed for extracting tar and ammonia from blast
furnace gases, the formation of flues around the sulphate still, whereby the said
still is heated by the furnace gases as they pass through the said flues.
Secondly-The means herein set forth of removing the gritty substances from
the gas as it passes through the flues.