Improvements in connection with Boilers and Boiler Furnaces.
Year: 1890

page_text: Date of Application, 17th Mar., 1890-Accepted, 26th Apr., 1890
COMPLETE SPECIFICATION.
[Communicated from abroad by GEORGE JOSEPH CARTWRIGHT, of 187, Elizabeth
Street, Sydney, in the Colony of New South Wales, Engineer.]
Improvements in connection with Boilers and Boiler Furnaces.
1 HENRY EDWARD NEWTON of the Office for Patents, 6 Bream's Building,
Chancery Lane in the County of Middlesex, Patent 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 is applicable to almost any kind of boiler, but in order that the
improvements may be understood, I shall describe them as applied to a Cornish
tubular boiler.
In the accompanying drawing,
Fig. 1 is a longitudinal vertical section.
Fig. 2 is a view of the boiler, half in front elevation and half in cross section, taken
on the line 1, 2 of Fig. 1.
The boiler shown in the drawing is of the Cornish tubular pattern, fitted with my
special apparatus for the more perfect combustion of the fuel.
A is the boiler, B the fire tube or flue. C is the bridge that contains an air
passage D, the entrance to which, boneath the firebars of the furnace F, is governed
by a damper G, that is operated from the front of the boiler by the rod and handle H.
The
passage takes an upward course, and its exit opening is near the top, at the back
of the bridge, which slightly overhangs in order to prevent any ashes or soot from
falling into the passage D. Tho wall below the opening also prevents the passage
becoming blocked with ashes &c.-An auxiliary air supply is admitted (via the ash
pit F) to the combustion chamber J, behind the bridge C, through the air passage D,
the supply of air being regulated by the falling door K in front of the boiler and the
damper G at the bridge C. On arriving at the end of the combustion chamber J,
the products of combustion will enter an uptake chamber L, placed at the end of the
boiler, and will then pass upwards and enter return fire tubes a a' a² a in the boiler.
On arriving again at the front of the boiler, such of the gases, smoke, &c., as have
passed through the upper return tubes a a', will enter a chamber M attached to the
front of the boiler, and will be conveyed thence direct to the uptake or funnel, while
thoso gases, smoke, &c., that have passed through the lower return tubes a² a³, will be
prevented from rising in the chamber M by an adjustable horizontal baffle pluto N,
that divides the chamber M into two parts. The baffle plate N is so placed as to have
the offect of returning the last mentioned gases into the mouth of the furnace F
through the opening m. The baffle plate N is made adjustable, so that one, two, or
three tiers or rows of the return fire tubes may be cut off from the uptake, and the
gases &c. conveyed along them be returned into the mouth of the furnace. The baffle
plate M consists merely of a plate of iron supported in grooves n n. The openings in
the front of the chamber M, through which the baffle plate is introduced, may be
closed in any suitable manner; the means adopted in the drawing consists of an
ordinary flap. The particular function of the baffle plate N is to ensure that a
smaller or larger quantity of the partially or wholly unconsumed gases or smoke shall
be returned into the furnace, and that the amount of draught shall be regulated. By
the admission of a supply of fresh air to the combustion chamber through the
passage D, a more perfect combustion of the gaseous products, smoke, &c., that pass
away free, or only partially consumed, from the furnace or firebox, is effected.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. The adjustable baffle plate N, placed in the uptake chamber M, for the purpose
of diverting the smoke, and partially consumed products of combustion, from the
uptake, and returning them into the furnace, as herein described.
2. The combination of the air passage D, damper G, rear uptake chamber L, and
front uptake chamber M, for the purpose of securing a more perfect combustion of
the fuel in the furnace, and minimising the amount of smoke given off therefrom.
3. In connection with tubular steam boilers and boiler furnaces, the combination of
means for introducing air at the back of the bridge, with means for diverting a greater
or less proportion of the products of combustion, after passing through the tubes, to
the furnace, whereby economy of fuel, and more perfect combustion than heretofore,
is effected, as set forth.