Improvements in the Means of Obtaining Forced Draught in Steam Generator and other Furnaces
Year: 1891

page_text: Date of Application, 2nd July, 1891
Complete Specification Left, 1st Apr., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in the Means of Obtaining Forced Draught in Steam
Generator and other Furnaces.
We THOMAS SPENCER PAYNE of 63 Battersea Park Road, London S.W. and
CHARLES POLYBLANK of 47 Uplands Crescent, Swansea in the County of
Glamorganshire, Engineers do hereby declare the nature of this invention to be as
follows:-
This invention consists in constructing the furnace of bars or plates having slots
crosswise formed therein or thercon and strengthened by having a rib or ribs on the
underside, the slots having a sufficient area to admit the requisite quantity of air
to burn dust coal or any particular kind of fuel; also in supplying air by a
combined pneumatic injector and steam blower working a pressure fan or blower.
When not desirable to use the fan steam may be supplied through a steam nozzle
passing through and forming part of the pneumatic injector or steam and air may
be used together, the steam may be taken either from the boiler or exhaust, or
waste steam may be employed thereby forming an oxyhydrogen furnace.
The pneumatic injector is equally applicable for ventilating or exhausting
purposes.
Dated thin and day of Luly 1901
HERBERT & Co.,
Agents to. Applicants.
COMPLETE SPECIFICATION.
Improvements in the Means of Obtaining Forced Draught in Steam
Generator and other Furnaces.
We THOMAS SPENCER PAYNE of 63 Battersea Park Road London, and
CHARLES POLY BLANK of 47, Wind Street, Swansea, Glamorganshire, 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:-
The invention consists in constructing the furnace of bars or plates, having slots
crosswise formed therein or thereon and strengthened by having a rib or ribs on
the underside the slots having a sufficient area to admit the requisite quantity of
air to burn dust coal or any particular kind of fuel, also in supplying air by a
combined pneumatic injector and steam blower using a pressure fan or blower.
When not desirable to use the fan, steam may be supplied through a steam nozzle
passing through and forming part of the pneumatic injector or steam and air may
be used together, the steam may either be taken from the boiler, or exhaust or
waste steam may be employed thereby forming an oxyhydrogen furnace.
The pneumatic injector is equally applicable for ventilating or exhausting
purposes.
In the annexed drawing
Fig. 1 illustrates in front elevation a Lancashire boiler fitted with two of the
combined pneumatic and steam air injectors. Fig. 2 is a sectional view of part of
the said boiler and of one of the said injectors.
Fig. 3 is a plan view of the improved grate.
Fig. 4 a section thereof on line a a.

page_text: extending over all the plate except where the longitudinal ribs C C, necessary to
give strength to the grate are situated. The slits B are preferably wider at their
lower than at their upper ends as shown in Fig. 4.
To feed air to this grate an air blašt pipe D leading in any suitable way from a
blower not shown in the drawing terminates as a nozzle E directed into the ash
space below the grate and there projects into a tubular sleeve preferably slightly
tapered towards both ends, the one end being open outside the furnace and the
other open inside the furnace under the grate and directed preferably in a plane
perpendicular to the cross slots B therein. The air blast from the nozzle E draws
in air into the sleeve F and feeds same to the furnace. Within the nozzle E is a
nozzle G at the end of the pipe H through which a current of steam may be
allowed to pass as aforesaid to operate the injection of air either instead of or in
conjunction with the air blast.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. In a steam generator or other furnace the means for obtaining forced draught
consisting in an air injector adapted to be operated either by an air blast or a
steam blast or by a combination of these substantially as set forth.
2. In a steam generator or other furnace the means for obtaining forced draught
consisting in an air injector adapted to be operated by an air blast or by a steam
blast or by both in combination with a grate having cross slots substantially as set
forth.
3. In a steam generator or other furnace the combination with a forced draught
apparatus feeding into the ash space of a grate constructed as herein described
having cross slots arranged perpendicular or substantially so to the directions of
draught.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicants.