Improvements in Boiler Furnaces.
Year: 1898

page_text: Date of Application, 18th Mar., 1898
Complete Specification Left, 17th Dec., 1898-Accepted, 18th Mar., 1899
Improvements in Boiler Furnaces.
We, WILLANS & ROBINSON, LIMITED, PERCY ARCHIBALD Low, and WILLIAM
MARSHALL, HUSKISSON, all of Victoria Works, Rugby, Engineers, do hereby declare
the nature of this invention to be as follows:
This invention relates to the furnaces of water tube boilers in which the tubes
are parallel or nearly so to the grate and especially to those in which the lower
tubes are only a short distance above the grate.
We place a baffle above the lower rows of tubes extending from the front
of the furnace towards the back. Preferably this baffle consists of empty tubes
fitting in between the water tubes.
At the rear end of this baffle is a vertical or nearly vertical wall of bricks.
suitably formed to fit in between the tubes. This wall is supported by a bridge
which is preferably hollow and arched in two directions the centre of one arch
being below and preferably somewhat to the rear of the bridge whilst the centre
of the other arch is below and to the front of it. Holes are provided leading
from the hollow of the bridge to its front face to supply air to the fire.
The gases from the fire first rise up amongst the front ends of the lower rows
of tubes and being deflected by the baffle sweep down and around the bridge so
becoming heated and meeting the hot air are completely burnt. The products
of combustion pass beneath the bridge and up through the rear ends of the lower
rows of tubes and amongst the whole length of the upper rows.
Dated this 17th dar of March 1908
WILLANS & ROBINSON, LIMITED.
By C. S. ESSEX,
Secretary.
improvements in Boller Furnaces.
We. WILLANS & ROBINSON, LIMITED, PERCY ARCHIBALD Low, and WILLIAM
MARSHALL HUSKISSON, all of Victoria Works, Rugby. Engineers, 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 the furnaces of water tube boilers in which the tubes
are parallel or nearly so to the grate and especially to those in which the lower
tubes are only a short distance above the grate.

page_text: We place a baffle above the lower rows of tubes extending from the front
of the furnace towards the back. Preferably this baffle consists of empty tubes
fitting in between the water tubes or of tiles or fire-bricks.
At the rear end of this baffle is a vertical or nearly vertical wall of bricks suitably
formed to fit in between the tubes. This wall is supported by the tubes and by a
bridge which is preferably hollow and arched in two directions the centre of one arch
being below and preferably somewhat to the rear of the bridge whilst the centre
of the other arch is below and to the front of it. Holes are provided leading
from the hollow of the bridge to its front face to supply hot air to the fire.
The gases from the fire first rise up amongst the front ends of the lower rows
of tubes and being deflected by the baffle sweep down and around the bridge so
becoming heated and meeting the hot air are completely burnt. The products
of combustion pass beneath the bridge and up through the rear ends of the lower
rows of tubes and amongst the whole length of the upper rows.
Figures 1 and 3 are central longitudinal sections of furnaces constructed accord-
ing to this invention and Figures 2 and 4 are sections on the lines 2-2, 4-4
Figures 1 and 3.
Figures 1 and 2 shew a boiler, in which all the tubes are left the full length.
In Figures 3 and 4 the lower rows of tubes are shortened, so as to form a
combustion chamber at the back of the bridge. Otherwise, the same description
applies to both.
A few of the lower rows of tubes a are screened off from the upper ones by
baffle tube placed on the top of them, and some way along them is built the
fire bridge e which is arched in two directions, viz.at across the boiler,
facing downward toward the fire bars, and also at c² nearly at right angles to
this thus making a very strong double arch.
This arch has a hollow c³ in it into which air is led from the outside of the boiler,
by passages and through perforated bricks into the fire space.
The object thus attained, is, that the smoke and uncombined gases go, first of
all, amongst the lower tubes, under the baffle tubes, and along to the heated arch,
where they meet air, and so have a better chance of getting combined with oxygen,
and burning, before they go behind the arch, and so up to the main tubes of the
boiler.
In the case of Figure 3, with shortened tubes, the air is allowed to circulate
before coming into fire space, behind the ends of the shortened tubes, thus
keeping them cool.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
1.A baffle above the lower rows of tubes extending from the front of the
furnace to a bridge between the front and rear substantially as described.
2. The double arched bridge substantially as described.
3. In furnaces such as are referred to in Claims 1 and 2 admitting air at the
bridge substantially as described.
4. Boiler furnaces substantially as described and illustrated in the drawings.
Dated this 15th day of Decembar 1808
PERCY A. LOW.
WILLANS & ROBINSON LIMITED.
WILLIAM MARSHALL HUSKISSON.
By Carpmael & Co.,
Agents for the Applicants.