Improvements in or connected with the Furnaces of Steam Boilers.
Year: 1892

page_text: Date of Application, 17th May, 1892
Complete Specification Left, 17th Dec., 1892-Accepted, 4th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Furnaces of Steam Boilers.
I, THOMAS BELCHER, of No. 111, Dalyell Road, Brixton, in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in or connected with the furnaces of
steam boilers, and has for its object to promote the more perfect consumption of
the smoke and products of combustion.
· For this purpose, I place within the furnace tube at the upper part thereof, and
near to the furnace door, a perforated jet pipe preferably curved to the shape of
the furnace tube, and I connect the curved jet pipe by a suitable length of pipe,
preferably passing through a brick arch, with a trumpet shaped air collector located
upon the exterior of the furnace and which may be arranged either vertically,
horizontally, or in other convenient position.
Into this trumpet shaped air collector, I lead a steam pipe from the boiler fitted
with a suitable regulating or cut off valve, and I lead this steam pipe down to
about the junction of the trumpet shaped air collector with the connecting pipe of
the curved jet pipe, so that upon opening the regulating or cut off valve, a jet or
steam from the boiler will rush through the connecting pipe carrying with it a
considerable volume of air and the combined air and steam will issue from the jet
pipe and mingle with the products of combustion from the burning fuel, thereby
assisting the 'draught of the furnace, and, at the same time, materially aiding the
consumption of the smoke and products of combustion.
The device hereinbefore described may be easily applied to any existing furnaces
at a slight cost, and will materially enhance the efficiency thereof.
Dated this 17th day of May 1892.
VAUGHAN & SON,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or connected with the Furnaces of Steam Boilers.
THOMAS BELCHER of 31 Pulross Road, Brixton, London, S. W. in the County
of: Surrey Working 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 :-
My invention relates to improvements in or connected with the furnaces of
steam boilers and has for its objects, the prevention of smoke, the raising of the
combustion to be obtained from the fuel to the highest possible degree and giving
increased power for generating and maintaining steam.
'The appliance used for this purpose is a trumpet shaped air pipe fitted with a
regulating slide or disc in the mouth and situated on the outside of the boiler, this
air pipe is connected by a single double or triple union to a bend or bends as
required for single, double or triple furnaced boilers, this bend or bends penetrating
the door frame or frames just above the door or doors and connected on the inside
of the furnace or furnaces to a perforated spreader or spreaders.
Into this trumpet shaped air pipe I lead a small steam jet down to the union, or
introduce a steam jet near the union fitted with a regulating valve and on opening
the valve a jet of steam from the boiler will rush through the connecting bend or
bends, and the perforated spreader or spreaders carrying with it a volume of air
DO27

page_text: and this steam and air mingling with the products of combustion materially aids
the consumption of the smoke developes the fullest combustible properties of the
fuel and affords greatly increased powers for the generation of steam.
The accompanying two sheets of drawings represent this appliance showing the
uses thereof.
Fig. 1 is a front elevation of a triple furnaced boiler fitted with a single air tube
and a three way connection for inducing air & steam to the furnaces.
Fig. 2 is a front elevation of a double furnaced boiler fitted with a single air
tube and a two way connection for inducing air and steam to the furnaces.
Fig. 3 is a front elevation of a double furnaced boiler fitted with an air tube to
each furnace for the supply of air and steam.
Fig. 4. is a front elevation of a single furnace locomotive boiler fitted with a
single air tube and a bow shaped spreader for the supply of air and steam.
Fig. 5. is a front elevation of part of a multitubular boiler fitted with a single
air tube and a T shaped spreader for the supply of air and steam.
Figs. 6. 7. 8. 9 and 10 are sectional elevations of the different air tubes steam
jets and spreaders.
Similar letters of reference denote similar parts throughout the drawings.
A Figs. 1 and 6 is a large air tube fitted with a three-way connection D and
tubes R. R¹ to bends F, F. Bends HH', H' complete the connection of the
whole to the semi-circular perforated spreaders J. J¹ and J.
The steam pipes S. S¹ and S' by turning on the valves M, M' and M' supply a
jet of steam which carries air intermingled with it through the semi-circular
spreaders J, J and J' to the furnaces N, N¹, and N. The air tube A could be
led to and connected with the chimney or funnel for the purpose of drawing hot
air to the furnaces, or it could be led vertically, horizontally or otherwise to coal
bunkers, stoke holds, or other compartments or spaces to almost any distance to
exhaust from such places and to consume hot or foul air, noxious or inflamable
gases &c.
B Figs. 2 and 7 is an air tube fitted with a two-way or T connection E and
tubes R. R³ to bends F, F. Bends H³, H complete the connection of the whole
to the semi-circular perforated spreaders J and J.
The steam pipes S³, S by turning on the valves M³ and M* supply air and steam
to the furnaces similar to the method described above.
In the mouth of this air tube a slide or disc P is fitted to regulate the supply of
air, and a cone T which deadens the noise otherwise caused by the inrush of air.
C and C Figs. 3 and 8 are single air tubes connected to the spreaders J and Je
by the bends or unions H' and H and actuated by steam pipes or jets S and S*
regulated by valves M and M in the same manner as explained above. The
regulating discs P¹ and P' control the supply of air and the cones T¹ and T* deaden
noise.
C' Figs. 4 and 9 is a single air tube connected to the bow spreader K by the
bend or union H' and actuated in the manner described by the steam jet S' for use
in locomotive boilers.
This air tube could be led and connected to any part of the funnel flue or
chimney or to any adjacent place to draw hot air, inflamable gases &c.
C, Figs. 5 & 10 is a single air tube connected to the flat T spreader L by the
bend or union H8 and actuated by the steam jet S for use in multitubular boilers
and other boilers fired from the bottom.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1st. A trumpet shaped air pipe with a triple union actuated by steam jets through
the bends and spreaders, inducing air and steam to the surface of the fuel.
2nd. A trumpet shaped air pipe with a double union actuated by steam jets
through bends and spreaders inducing air and steam to the surface of the fuel.

page_text: 3rd. A trumpet shaped air tube with a single bend to each furnace of either
triple, double, or, single furnaced boilers actuated by a steam jet or jets, through
the bend or bends and spreader or spreaders.
4th. These trumpet shaped air pipes in each case can be applied to perform the
process of exhausting hot or foul air or gases from any place or places adjacent to
the boiler or boilers on which they are used, by extending the trumpet shaped tube
as necessary by means of pipes, bends, &c.
Dated this 23rd day of January 1893.
THOMAS BELCHER.