Improvements in and connected with Steam Boilers for Smoke Consuming Purposes.
Year: 1899

page_text: Date of Application, 8th Feb., 1899-Accepted, 11th Mar., 1899
COMPLETE SPECIFICATION.
Improvements in and connected with Steam Boilers for Smoke
Consuming Purposes.
We, JOHN HIGHAM GADD, of 45, Old Lane, Engineer, and WILLIAM HARROP, of
The Grange, Cotton Spinner and Manufacturer, both of Hollinwood, in the County
of Lancaster, 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 improvements in and connected with steam boilers and
has for its object to provide means whereby the black smoke created each time
when firing or breaking up the fuel is effectively consumed.
And in order that our invention may be more fully understood we have caused
to be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures.
Figs. 1 & 2 are respectively a front and a back end view and Fig. 3 a sectional
plan of a double flued steam boiler provided with our improvements.
In carrying out our invention we form a passage a between the two furnaces
or boiler flues b, b₁, near or at the front end of the boiler c through which the hot
gases can pass alternately from one flue into the other for a short period of time
after having fired or broken up the fuel.
To cause this diversion of current we employ at the back end outside of each
furnace or boiler flue a damper d, d', see Figs. 2 & 3, which are adapted to be
closed and opened alternately but both to remain open after the black smoke
has been burnt.
The dampers d, d are arranged outside the ends of the flues b, b', so that they
are not liable to get burned and are each secured to a spindle e, el mounted in
bearings and a socket f, f¹ secured to the outside of the boiler c, the dampers
fitting against rings g, g¹ secured into the boiler flues.
The said dampers we open and close through the medium of a column of liquid,
say water and steam pressure, say in the following manner:
The top of each damper spindle e, e' we furnish with a short lever h, h¹ con-
nected by means of a rod i, i to an angular weighted lever k, k¹ resting respectively
upon a piston or diaphragm arranged in a cylinder m, m¹, see more particularly
Fig. 1.
Each of these cylinders is connected to a water pipe n, n inclining towards the
back of the boiler and joined to a steam pipe o employed in front of the boiler c
and supplied with steam from the boiler by the branch c. This pipe is furnished
with two three-way taps p, p², each operated by a long spindle q, q' furnished with
a handle r, r. When turning the said taps in one direction steam is allowed
to act upon the column of water in the respective pipe, which then through the
medium of the piston or diaphragm in its cylinder raises the weighted lever
resting thereon and through the connections aforesaid closes the respective damper.
When turning the three-way tap in a reverse direction, the steam pressure is cut

page_text: off from the column of water and the steam in the pipe o allowed to escape through
the pipes, whilst the said weighted lever being permitted to fall back, opens the
respective damper.
The diversion of the hot gases from one furnace or boiler flue to the other takes
places as follows:
After having fired or broken up the fuel in the furnace or boiler flue 6 the
damper d' of the other flue is closed and the damper d of the flue 6 being open,
the hot gases are drawn through the passage a, over the freshly supplied or broken
up fuel and the black smoke arising from the fuel burned by the said gases which
then pass through the flue into the chimney.
As soon as the smoke has abated the damper d' of the flue is opened again
and the normal conditions of the draught thereby restored.
Having now particularly described and ascertained the nature of our said
invention and in what manner the said is to be performed, we declare that what
we claim is :-
1st. In and connected with a two flued steam boiler, a passage a arranged at
or near the front end of the furnaces or boiler flues in combination with dampers
arranged at the back end outside of the flues, adapted to cause the hot gases to
pass alternately from one furnace to the other for the purpose of consuming the
black smoke arising each time when firing or breaking up the fuel, all sub-
stantially as set forth.
2nd. In a steam boiler, such as specified in the preceding claim, the
dampers d, d'arranged outside of the back end of the boiler flues, all substantially
as and for the purpose set forth.
3rd. In a steam boiler, such as specified in the preceding claims, the
dampers d, d actuated through the medium of a column of liquid and steam
pressure, all substantially as and in the manner herein before set forth.
Dated this 7th day of February 1899
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicants.