Improvements in Steam Generator Furnaces.
Year: 1897

page_text: Improvements in Steam Generator Furnaces.
I, EDWARD BROOK, of 7, Water Street, Huddersfield, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to furnaces wherein the air for combustion of the
coal or solid fuel is supplied by means of steam jet blowing apparatus and my
improvements comprise the special construction and arrangement of certain parts
thereof.
Heretofore, it has been usual to fix the steam jet blowers so as to project into
and be largely contained within the ashpit or chamber under the furnace, thus
obstructing the free removal of clinkers and ashes, especially from certain types
of machine or mechanical stokers.
The objects of my present improvements are to provide free access for the
removal of ashes and clinkers from the ashpit or blast chamber underneath the
furnace; to make the apparatus adaptable to all furnaces of the description to
which this invention applies, irrespective of the type of mechanical stoker
any structural
employed, or the construction of the fire grate or fuel bearers, without
alteration of the ashpit or blast chamber; to materially reduce the noise or sound
of the steam jet or jets; and to effect a more even distribution of the blast on the
underside of the fire.
In carrying out my invention, the ashpit or blast chamber under the fire is
closed by a metal plate or casting having a box or mouthpiece projecting there-
from, which is or may be integral with said plate or bolted thereto. The front or
face of said box is preferably arranged at an angle, or is suitably inclined, and is
closed by a moveable lid or cover, the removal of which enables unrestricted access
to be had to the ashpit or chamber for clearing out ashes and refuse matter. The
inclination of the front of the box, when the lid is closed thereto, acts as a shoot
to convey to the floor, the ashes and clinkers which are raked or drawn out of the
furnace. The said box or mouthpiece serves the double purpose of passing air
from the steam jet blowers to the ashpit, and forming the opening through which
the ashes and refuse matter are removed therefrom.
To the underside or lower part of the projecting box or mouthpiece, I attach the
delivery or diverging ends of one or more steam jet blowers which, preferably,
hang therefrom in an inverted position, their inlet ends projecting downwards to
a space or chamber below the floor line, or in the surrounding wall, as found most
convenient.
By the above construction and arrangement no part of the blowing apparatus
is contained within the ashpit or blast chamber underneath the fire or furnace,
whereby a clear and unobstructed ashpit or blast space is obtained, with free
access to same, whether a mechanical stoker, or an ordinary fire grate, or other
form of fuel bearer be employed, and, from the position of the blowers, the sound

page_text: or noise is greatly reduced, or rendered less objectionable while the delivery of
the blast is much more uniformly distributed under the fire.
1
TASKER & CROSSLEY,
Patent Agents, Huddersfield, Agents for Applicant.
Improvements in Steam Generator Furnaces.
I, EDWARD BROOK, of 7, Water Street, Huddersfield, in the County of York,
Engineer, 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 has reference to furnaces of the kind wherein the air for com-
bustion of coal or other solid fuel is supplied by means of steam jet blowing
apparatus. Heretofore it has been usual to so fix the steam jet blowers that they
project into and are to a large extent contained within the ashpit or chamber under
the furnace but this arrangement possesses the disadvantage that it prevents the
free removal of clinkers and ashes, especially from the ash pits of furnaces pro-
vided with certain types of machine or mechanical stokers.
Now my invention has for objects to so construct and arrange the steam jet
blowing apparatus as to provide free access for the removal of ashes and clinkers
from the ashpit or blast chamber beneath the furnace; to make the apparatus
applicable to all furnaces of the kind referred to irrespective of the type of
mechanical stoker employed, or the construction of the fire grate or fuel bearers,
and without the necessity of making any structural alterations of the ashpit or
blast chamber to materially reduce the noise or sound of the steam jet or jets
produced when the apparatus is at work; and to effect a more even distribution
of the blast on the underside of the fire.
To this end the ashpit or blast chamber of the furnace is closed by a metal
plate or casting from which projects a box or mouthpiece (hereinafter called a box)
that is or may be integral with the said plate, or be bolted thereto. The front or
face of the said box is preferably inclined upwardly and at a suitable angle to the
plate or casting and is closed by a movable lid or cover the removal of which
enables unrestricted access to be had to the ashpit or chamber for clearing out
ashes and clinker. The inclined front of the box, when the lid or cover is closed
against the same, acts as a shoot or guide to direct to the floor, ashes and clinkers
raked or drawn out of the furnace or combustion chamber. The said box serves
the double purpose of passing air from the steam jet blower or blowers to the
ashpit and forming the opening through which the ashes and refuse matter are
removed therefrom. To the underside or lower part of the projecting box is
attached the delivery or diverging end of one or more steam jet blowers which pre-
ferably hangs or hang from the box in an inverted position, the inlet end of the
blower, or of each of them when there are more than one, with steam jet, pro-
jecting downwards into a space or chamber arranged below the floor line, or in
an adjacent wall, as found most convenient.
Fig. 1 of the accompanying illustrative drawings shows, in front elevation, a
steam generator of the Lancashire type the furnaces of which are each provided
with steam jet blowing apparatus according to this invention. Fig. 2 shows in
vertical section, and Fig. 3 in front elevation, the application of my invention to
the furnace of a steam generator of the Cornish type.

page_text: In each case 1 is a plate closing the front end of the ash pit 2, or each ash pit,
and formed with an opening 3 over and opposite to which is secured, as by bolts 4,
a box 5 having an inclined front part 5" in which is a large opening 5b normally
closed by a removable inclined cover 6. 7 is a steam jet blower comprising a
conical pipe having its largest or diverging end secured to the underside of the
box 5 opposite a correspondingly large inlet opening 5 therein, and its lower
and smaller end, which is provided with the usual steam nozzle 8, terminating
within a chamber 9 below the floor level 10. 11 is a pipe for supplying steam to
the steam nozzle or nozzles 8. By making the front part 5 of the box and the
cover inclined, the air delivered into the box by the blowing apparatus is
deflected laterally into the ashpit. When ashes and the like are to be withdrawn
from the ashpit, the cover 6 is removed and the opening 5° suitably covered, as
by a plate, to prevent ashes falling through it and choking the steam nozzle the
supply of steam to which at this time is, of course, shut off.
As will be seen, by the construction and arrangement described and shown, no
part of the blowing apparatus is contained within the ashpit or blast chamber 2
beneath the combustion chamber 12, so that a clear and unobstructed ashpit or
blast chamber is obtained to which free access can be readily obtained, whether a
mechanical stoker, or an ordinary fire grate or other form of fuel bearer be
employed, and, from the position of the blower or blowers, the sound or noise of
the steam jet or jets is rendered much less objectionable than heretofore, while the
delivery of the blast is much more uniformly distributed under the fire than is
the case when the blower projects into the ash pit.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. A furnace of the kind herein referred to wherein the steam jet blowing appa-
ratus has its delivery end attached to the underside or lower part of a box or mouth
piece projecting from the plate closing the front end of the ash pit or blast chamber
and its suction or inlet end with steam nozzle within a chamber arranged below
the floor level or in an adjacent wall, substantially as described and shown for the
purposes specified.
2. In a furnace of the kind herein referred to the improved construction and
arrangement of box or mouthpiece with inclined front side and removable lid or
cover and steam jet blower hereinbefore described with reference to and shown in
the drawings annexed.
Dated this 23rd day of February 1898.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.