Improvements in Steam Boiler Furnaces.
Year: 1892

page_text: Date of Application, 29th Jan., 1892-Accepted, 5th Mar.. 1892
COMPLETE SPECIFICATION.
Improvements in Steam Boiler Furnaces.
I, JOHN WILLIAM OLDROYD of Grünberg in the Province of Silesia in the
German Empire, Manufacturer, do hereby declare the nature of this invention
and the manner in which the same is to be performed, to be particularly described
and ascertained in and by the following statement :—
My invention relates to improvements in steam boiler furnaces of the kind
described in the Specifications to my Letters Patent No. 2612 of 14th February
1889 and No. 20327 of 12th December 1890.
The perforated tube represented in the drawings accompanying the Specifications
to the abovenamed Letters Patents No. 2612 of 1889 and No. 20327 of 1890,
located beneath the furnace grate for feeding a mixture of combustion gases and
preparatorily heated air, ends in a special box which carries the fire bridge.
This box or case provided with a closing device and with a perforated rear wall
serves to attain the perfect combustion of any products of combustion which pass
beyond the fire bridge.
In order to better attain this purpose an inclined flame tube or deflector is
arranged behind the fire bridge so as to compel the flames to pass immediately past
the perforated rear wall of the case or box.
As the combustion by this arrangement is perfect heated air alone instead of the
admixture of heated and combustion gases can be forced into and through the fuel
on the grate.
Fig. 1 of the accompanying drawing is a longitudinal section through a steam
boiler provided with my improvements, some of the parts in elevation.
Fig. 2 is a cross section of the flame tube, the device being seen from the rear
side.
The tube a which is connected to a ventilator serves to feed the heated air to
the perforated tube beneath the grate, the perforated tube being connected to the
box or case c.
The said box has in its forward wall a socket d for receiving the
tube and a flap e in order that by adjusting the same the outlet of air to the rear
of the fire bridge can be regulated.
The rear, preferably inclined wall of the box c is provided with numerous,
preferably conical, borings through which the hot air which is forced into the
tube b and enters the box e will flow and be directed in slanting direction upwards.
At an appropriate distance to the rear of the bridge, an inclined deflector wall is
arranged in the flame tube a flue g and parallel to the inclined rear wall of the
box c which compels the flame and products of combustion passing the fire bridge
to pass in front of the perforated wall of the box c in order that any imperfectly
consumed products of combustion which might pass the fire bridge may be intimately
mixed with the hot air issuing from the borings in the inclined wall so that a
perfect combustion must take place. The tube is at its forward end provided
with a suitable flap i which readily permits of the said tube being cleaned. A
ratchet wheel k with handle is provided which is in articulated connection by
means of a rod with the flap e so that the said flap e can be regulated from the
exterior of the boiler. The flap e is retained in open condition by means of a
pawl m which gears into the ratchet wheel k.
It will be evident to those versed in the art that the details of my above
lescribed improvements can be modified in various manner without in any way
leparting from the nature of my invention.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and the manner in which the same is to be performed, I declare that what I
claim is:
In steam boiler furnaces, the arrangement of a box c which carries the fire bridge
and is in connection with a perforated tube located beneath the fire grate and
which in order to regularly feed the hot mixture of combustion gases and air or
hot air alone to the rear of the fire bridge so as to attain the perfect combustion
of any imperfectly consumed products of combustion which may pass the fire bridge,
whereby an inclined deflector wail in the flue to the rear of and parallel to the
perforated rear wall of the box e causes the said products of combustion to be
intimately mixed with the hot air or mixture of hot air and hot products of
combustion and thus effect a perfect combustion, substantially as described.
Dated 29th January 1892.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.