Improvements in Gas Fired Furnaces for Boilers and the like.
Year: 1891

page_text: Date of Application, 10th Feb., 1891-Accepted, 25th Apr., 1891
COMPLETE SPECIFICATION.
Improvements in Gas Fired Furnaces for Boilers and the like.
I, EDWARD CAMPBELL JONES, of The South Boston Gas Light Company,
South Boston, in the County of Suffolk, and State of Massachusetts, one of the
United States of America, Gas 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 relates to improvements in gas fired boilers and it is carried out
as follows reference being had to the accompanying drawings where
Fig. 1 represents a central longitudinal section of the invention.
Fig. 2 represents a cross section on the line X X shown in Fig. 1.
Fig. 3 represents a cross section on the line Y Y also shown in Fig. 1 and
Fig. 4 represents a modification of the invention as applied to a battery or group
of boilers.
Similar letters refer to similar parts wherever they occur on the different parts
of the drawings.
In the drawings A represents a steam boiler of any well known form of
construction and B represents the brickwork in which the same is set as usual.
C is the flue or chamber below the boiler and C¹ is the forward part thereof or
what is generally termed the fire box. D is the bridge and E is the grate as usual.
F represents the ordinary ash pit below the grate E. G and H represent
respectively the doors in front of the fire box and ash pit as usual.
I is the combustion chamber which is separated from the flue or chamber C by
means of the horizontal wall or flame plate K as shown in Figs. 1 and 3. From
the forward end of the combustion chamber 1 leads a vertical conduit I' connected
by means of horizontal passages ii to the rear of the fire box C¹ as shown in
Fig. 1. Within the rear portion of the combustion chamber I are located the
respective air and gas supply pipes L and M which are preferably made long
enough to extend the whole width of the combustion chamber I as shown in
Fig. 3.
The outer or supply ends of said air or gas pipes are provided with respective
suitable valves or cutoffs I m shown in Fig. 3 by means of which the amount of air
and gas supplied to the combustion chamber is regulated or altogether cut off. as
may be desired. The air pipe L is connected directly to the atmosphere outside
of the combustion chamber and the gas supply pipe M is connected to the gas main
or other source of producer or other fuel gas in any well known manner.
In devices of this kind it is very desirable that the supply of air and gas should
each be equal throughout the width of the combustion chamber, so as to prevent
one side of the latter from being heated more than the other and for this purpose I
provide the said air and gas supply pipes L M with the respective tapering
delivery vents or burners L M¹ which latter are made gradually increased from
the direction of supply as shown by arrows in Fig. 3.
The object of making said vents or burners gradually increased in the direction
of the air and gas supplies is for the purpose of producing an equal delivery
throughout the length of said air and gas pipes independent of the resistance in the
same by which I obtain a uniform heat and combustion of the combined gases
throughout the entire width of the combustion chamber.
In front of the gas supply pipe M I have shown a small gas pipe m' (Figs. 1
and 3) the escaping gas of which may be ignited for the purpose of igniting
the air and gas escaping into the combustion chamber from the vents or
burners L M.
N represents a door or gate covering an opening in the side of the combustion

page_text: chamber I through which the combustion of the gases may be ascertained or the
gas ignited as may be desired.
In practice I prefer to arrange on the flame plate K a bridge k for the purpose
of bringing the heated products in more intimate contact with the underside of the
boiler A as shown in Fig. 1.
During the operation of the device the doors G and H are kept closed. The air
and fuel gas is admitted into the combustion chamber I through the respective
tapering vents or burners L' M' and there ignited, causing an equal supply
throughout the entire width of the combustion chamber, and the union an
combustion of such gases being ignited causes the flame to pass forward through
the combustion chamber, up through the conduit I' and out through the passages ii
into the fire box C and from the latter as heated products into the flue C below the
boiler and through the heating flues to the chimney by which the bent and increased
heating results are obtained.
In Fig. 4 a battery or group of boilers are shown side by side; in such
arrangement of boilers it is not always convenient to supply the air and gas at one
side of the combustion chamber and it may be necessary to use a centre supply of
air and gas and in such cases I make the vents or burners tapering in opposite
directions from the air or gas supplies so as to produce an equal delivery of air and
gas throughout the width of the combustion chamber irrespective of the resistance
in the said air and gas supply pipes in all cases however it will be noticed that the
vents or burners are made increasing in area in proportion as they recede from the
source of supply so as to increase the area of such vents or burners in the pro-
portion to the frictional resistance of the gases in the air and gas supply pipes.
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
laim is :-
:-
1. In a gas fired furnace a pair of air and gas supply pipes extended laterally in
the combustion chamber and having tapering vents or burners increasing in size
from the supply ends substantially as and for the purpose set forth.
2. In a gas fired furnace, a combustion chamber having arranged with it a pair
of air and gas supply pipes provided with tapering vents or burners combined with
the vertical conduit l' and horizontal passages leading to the fire box of the
furnace substantially as and for the purpose set forth.
3. In a gas fired furnace a combustion chamber having arranged within it a pair
of air and gas supply pipes provided with tapering vents or burners combined with
the vertical conduit I horizontal passages i leading to the fire box, the flame
plate K interposed between the combustion chamber and the flue below the boiler
and the bridge k substantially as and for the purpose set forth.
Dated this 10th day of February 1891.
.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.