Improvements in Forced or Induced Draught Apparatus for Furnaces.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Forced or Induced Draught Apparatus for Furnaces.
66
WILLIAM FREDERICK RICHMOND, Shellness, Stradella Road, Herne Hill,
London, S.E., Mechanical Engineer, ARTHUR STANLEY DOUGLAS, The Elms,"
Hucknall Torkard, Notts, Mining Engineer, do hereby declare the nature of this
invention to be as follows:-
The furnace door or part of furnace corresponding thereto above or communicat-
ing with the space above, the fire bars or fuel has fixed upon it one or more tuyeres
or mouthpieces. From some convenient place a steam jet is brought in such a
manner that it plays into each abovementioned tuyere. Beneath the fire level a
similar jet (or jets) is/are used. There are fixed upon the pipe supplying steam
to the draught jets, suitable cocks or valves whereby the draught inducing jets
may be perfectly controlled.
Dated this 20th dow of Anil 1807
WILLIAM F. RICHMOND.
ARTHUR S. DOUGLAS.
Improvements in Forced or Induced Draught Apparatus for Furnaces.
<
WILLIAM FREDERICK RICHMOND, Engineer, Longton Ironworks, Staffs, and of
Shellness," Stradella Road, Herne Hill, London, S.E., and ARTHUR STANLEY
DOUGLAS, Mining Engineer, The Elms, Hucknall Torkard, Notts, 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 apparatus has for its objects the economy of fuel more rapid generation of
steam and lessening of smoke by increased supply of oxygen by means of induced
currents of air to the burning fuel in steam boiler and other furnaces induced by
duly controlled cone jets of steem.
The special feature of this invention is the method of directing currents of air
through the door or doors of a boiler or like furnace, the object of which is to
impinge oxygen, by means of such air currents, on to the upper surface of the
burning fuel, to assist combustion and decrease smoke the system being based upon
the theory, that air passed in the ordinary way, into the underside of a burning
mass of fuel, is deprived of its oxygen, before the upper surface of the fire is
reached, and loss and smoke is thus occasioned, by incompletely burned particles,
being carried away by the flue gases, from the upper layers of the fire.

page_text: This apparatus is constructed as follows.-
Steam piping A of suitable size, is brought from some convenient place to such a
position, (usually horizontal) at its working end, that the specially arranged jets
(consisting of a small piece of metal with a fine hole, coned outwards thro' its
centre formed for the purpose of allowing the steam issuing from such hole to
expand into a conical form instantly it leaves the jet piece) attached thereto, can
be directed below the firebars or fire space. A connection or extension of such
piping, or if desired a separate set, is brought above, or at the side, or in between,
the door or doors, as the case may be, and so arranged that a similar jet to those
above mentioned, can be directed, into the mouth of the tuyeres, or trumpet pipe
or pipes.
These latter pipes, are designed with a comparatively small orifice, at the
entrance or mouth, and 'widen gradually, with a shape approximating to a curved
developement of a cone, and turn inwards to the door to which they are affixed,
thus giving the maximum delivery of air, consistent with the size of cone jet of
steam used with or directed therein. They are so affixed to their seatings on the
doors, that any door can be opened free of all contact, and without having to turn
off cocks or otherwise stop or adjust the apparatus. The pipes may be parallel
tubes, as well as cone shaped, with a somewhat less result.
1
Valves C are fixed at suitable places to control the issue of steam from the jet
. pieces.
The apparatus is operated by turning on the valves C, and allowing the cones of
steam to operate in their destined places, when the increased draught is at once
induced, by the friction of the sides of the cones of steam, upon the atmosphere.
A baffle plate D may be used with a deflecting lip, above the orifice, to direct the
current downwards on to the fire.
The drawing herewith shews an application to a Lancashire boiler.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed I declare that what
we claim is:
1. The use of pipes for affixing to or made upon a furnace door substantially as
specified and set forth in above specification and attached drawing.
2. The combination of steam pipes and steam jets with such door pipes, tuyeres,
or trumpet pipes.
3. The combination of underjets, door jets, door pipes and piping substantially
as specified and described herein.
Dated this Ninth day of Second Month One thousand eight hundred and
ninety eight
WILLIAM F. RICHMOND.
A. S. DOUGLAS.