Improvements in Boiler Furnaces.
Year: 1890

page_text: Date of Application, 3rd Feb., 1890
Complete Specification Left, 1st Nov., 1890-Accepted, 6th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in Boiler Furnaces.
I, ALFRED JOBSON, of Darlington, Colliery Agent, do hereby declare the nature of
this invention to be as follows:-
This invention relates to boilers in which there are internal furnaces the products
of combustion passing out at one end of the boiler into a descending flue and passing
back along a flue beneath the bottom of the boiler.
According to this invention I employ in this bottom flue a supplementary furnace
situated at the end of the flue where the products of combustion enter. The effect of
this fire is three-fold. First it assists in burning the products of combustion secondly
it increases the quantity of steam raised and thirdly it improves the circulation of
water in the boiler by keeping the bottom of the boiler hot. In some cases I build an
arch over the supplementary fire or part of it to prevent the products of combustion
from immediately entering it.
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Boiler Furnaces.
1, ALFRED JOBSON, of Darlington, Colliery Agent, 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 boilers in which there are internal furnaces the products of
combustion passing out at one end of the boiler into a descending fine and passing back
along a flue beneath the bottom of the boiler.
According to this invention employ in this bottom flue a supplementary furnaco
situated at the end of the flue where the products of combustion enter. The effect of
this fire is three-fold. First it assists in burning the products of combustion from the
internal furnaces, secondly it increases the quantity of steam raised, and thirdly it
improves the circulation of water in the boiler by keeping the bottom of the boiler
hot. In some cases I build an arch over the supplementary fire or part of it; this
arch serves to prevent the products of combustion from immediately entering it and
for other purposes.
In order that my said invention may be fully understood and readily carried into
effect will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal section of a steam boiler furnace constructed in
accordance with my invention. Figure 2 is an end view partly in section of the
same. a is the boiler and a' a' the internal fines or tubes containing furnaces a¹*.
bbare supporting walls on which the boiler is carried. c is the bottom flue. dan
outlet from the bottom flue. e is the descending flue connecting the boiler flues a¹ a¹
with the bottom flue c. f are side flues, they are in communication with the
bottom flue by passages d which lead up into them on either side. The side flues fƒ
are at their other ends connected with the chimney by descending passages or other-
wise. is a supplementary furnace in connection with the bottom flue. are the
fire bars. the ashpit. 93 the bridge and 9* the fire doors. is an arch turned over
the supplementary furnace or part of it, and allowing an ample outlet space for the
[Price dl

page_text: passage of the products of combustion from the supplementary furnace into the bottom
Alue. Sometimes I leave holes in the arch by which the flames from the supplementary
furnace may ascend into contact with the under side of the boiler. The brickwork
of the arch may with advantage be so constructed as to present pyramidal or other
projections on the under side to increase the radiating surface and to heat the rush of
cold air along it when the fire door is opened. The combustion products from the
main furnaces pass along the top of the arch h into the bottom flue c.
Air passages
capable of being closed when necessary are provided in the arch and in the side walls
and bridge to promote combustion by supplying air.
In cases where the products of combustion from the furnaces a¹× are led along
the side flues ff before being conducted into the bottom flue c, the supplementary
furnace g together with the arch are then placed at the opposite or front end of the
boiler in the flue c.
The bottom flue c may if desired be divided from end to end into two smaller flues
with a supplementary furnace in each; the flues will then be so arranged as to give to
each of the furnaces a¹× a separate connection with the chimney.
In some cases forced draught may be employed in the supplementary furnace,
mechanical feeders may also be provided if desired.
Sometimes the supplementary furnace or furnaces and the flue c in their vicinity
may with advantage be increased in width and in this case the flue is contracted
gradually as it passes away from the supplementary furnace or furnaces, whilst the
side flues ffare altered to admit of such enlargement being made.
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
1. Boiler furnaces in which the combustion products from the fires within the
internal flues of the boiler are conducted into a flue beneath the bottom of the boiler
and thence by side flues to the chimney and in which a supplementary furnace is
provided in connection with the said bottom flue at the end where the combustion
products from the main furnaces enter.
2. Boiler furnaces in which a supplementary fire place with arch over the same is
provided and in which the products of combustion from the main furnace are led over
the top of the arch and afterwards meet the products of combustion from the
supplementary fire and together with them pass in contact with the bottom of the
boiler to the chimney.
3. Boiler furnaces substantially as described.