Improvements in Furnaces for Steam Boilers applicable for Burning Wood Chips or Wood Refuse as Fuel.
Year: 1898

page_text: Date of Application, 12th Oct., 1898
Complete Specification Left, 1st May, 1899-Accepted, 8th July, 1899
PROVISIONAL SPECIFICATION.
Improvements in Furnaces for Steam Boilers applicable for Burning
Wood Chips or Wood Refuse as Fuel.
We, ARTHUR SHEPHERD, of Cunliffe Terrace, Bradford, in the County of York,
Timber Merchant, and JoHN EVAN STEEVENSON, of Randolph Road, Derby, in
the County of Derby, Timber Merchant, do hereby declare the nature of this
invention to be as follows;-
This invention is designed to provide a suitable furnace for steam generators
for use at saw mills and other similar places for the burning of wood chips and
wood refuse as fuel.
The invention is primarily intended for use with boilers of the portable engine
type. We construct or provide a chamber below the ordinary grate bars of the
generator which forms a combustion chamber. This chamber is of suitable shape
and provided at the bottom with a number of fire bars which are set at an angle
of about 45° with a dead plate at the same inclination. These bars divide the
chamber into two parts or there may be a second chamber formed outside, the
combustion chamber which is sufficiently large to permit of the clearing out and
to permit of a large supply of air to the furnace. By this arrangement of bars
a large combustion surface is obtained.
Instead of the second chamber or in addition to it air inlets or passages may
be provided to admit air in the desired quantity to support and promote com-
bustion.
The entrance to the chamber or chambers is closed by a flat lid or door of metal
hinged or pivoted in such a way as to receive the wood chippings or refuse and act as
a shoot for discharging same into the furnace. This lid when tilted rests upon the
inclined dead plate and at practically the same angle as it and the fire bars. By
this means a whole charge can be fed to the furnace at one operation instead of
by shovelling a little at a time.
A sheet iron guard is arranged around the tipping lid to prevent the chippings
being spread about as they are delivered thereon.
The combustion chamber is built of fire brick and attains a considerable tem-
perature promoting complete combustion of the wood refuse and the smoke arising
therefrom.
י
1000
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.

page_text: Improvements in Furnaces for Steam Boilers applicable for Burning
Wood Chips or Wood Refuse as Fuel.
We, ARTHUR SHEPHERD, of Cunliffe Terrace, Bradford, in the County of York,
Timber Merchant, and JOIN EVAN STEEVENSON, of Randolph Road, Derby, in
the County of Derby, Timber Merchant, 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 is designed to provide a suitable furnace for steam generators
for use at saw mills and other similar places for the burning of wood chips and
wood refuse as fuel.
It will be fully described with reference to the accompanying drawings:-
Fig. 1. Front elevation of the apparatus.
Fig. 2. Longitudinal section of same.
Fig. 3. Sectional plan.
Fig. 4. Transverse section part section before and part section behind the bridge.
Fig. 5. Longitudinal section showing a modification in construction and arrange-
ment.
Fig. 6. Transverse section of same. (Fig. 5).
Fig. 7. Plan of Fig. 5.
We construct a combustion chamber A of large capacity which extends below
the level or position of the ordinary grate or fire bars. The combustion chamber A
is of suitable shape and size and is constructed of fire brick or other suitable
material capable of attaining and resisting a high degree of heat.
The chamber A is provided with a bottom or base of fire bars B set at an
inclination of about 45° with an inclined dead plate C.
A second chamber D is formed below the fire bars B preferably also extending
outside the combustion chamber which permits of a large air supply to the furnace
through the grate and permits of the clearing out of the ashes from beneath the
grate.
By the inclined arrangement of bars B a large combustion surface is obtained
and the feeding of the furnace with the light wood chippings is facilitated.
Air inlets or passages E are provided to admit air in the desired quantity to
support and promote combustion. A hopper or receiver F for the wood chippings
is provided at the entrance to the combustion chamber and this entrance is closed
by a flat lid or door of metal G hinged or pivoted in such a way as to receive
the wood chippings or refuse and act as a shoot for discharging the same into
the furnace.
In the arrangement shown in Figs. 5 to 7 the lid G when tilted rests upon
the edge of the inclined dead plate and at practically the same angle as it and
the fire bars. By this means a whole charge can be fed to the furnace at one
operation instead of by shovelling a little at a time.
The steam generator may be set either at one side of the combustion chamber A
as in Figs. 1 to 4 or above it as in Figs. 5, 6 and 7 according to construction and
type of boiler to which it is applied.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
Furnaces for steam boilers, applicable for burning, wood chips or wood refuse

page_text: as fuel, constructed and arranged substantially as described and shown with
reference either to Figs. 1 to 4 or Figs. 5 to 7 of the drawings.
Dated this 24th day of April 1899.
WM. P. THOMPSON & Co.,
Manchester, Liverpool and London, Patent Agents.