Year: 1888

page_text: Date of Application, 12th May, 1888
Complete Specification Left, Sth Feb., 1889
Complete Specification Accepted, 9th Mar., 1889
I, JOHNSON MILLS of Keppel Road Chorlton-cum-Hardy in the County of
Lancaster Engineer do hereby declare the nature of this invention to be as
follows:-
The improvements which are the subject of this invention relate to the application
of a fire box or boxes, preferably of the flue tube form, to water tube steam boilers,' said
fire box or boxes being arranged in connection and combination with the several tubes
and drums forming water tube steam boilers, and it is intended to place said fire box
or boxes in the position usually occupied by the furnaces of existing water tube
steam boilers: the object of my invention is to utilize as far as possible all the
heat from the combustion of the fuel in the generation of steam, the flue furnace which:
surrounds the fire box absorbing nearly all its radiant heat thus utilizing the large
amount of heat hitherto wasted by absorption with ordinary brick walls of water tube
steam boiler furnaces, and also to avoid the cost of frequent renewals of the brick
furnaces which is now requisite in water tube steam boilers: I construct a flue
furnace of cylindrical form: the said furnace is encircled with an outer casing, the
space between the flue tube and shell or casing being used as a water chamber :
This furnace may be supported or suspended by straps, rings, bolts, brackets, or other
suitable means: At the rear end of boiler I place a mud and water drum in a
transverse position constructed so as to receive the ends of tubes necessary for
connecting said drum with the rear end of fire box by means of these tubes
I connect rear end of fire box with the mud drum: the connection between this
mud drum with the nest of water tubes and steam and water drum is obtained by
long nipples which are expanded in the respective positions in the ordinary manner,
or by other suitable means: I form a connection between the upper part of fire box
and the front portion of the water tube boilers by means of short tubes or nipples
connected with the headers or otherwise connected with the steam and water drum, or
by other suitable appliances.
:
The several connections being formed in the manner herein before described secure
and maintain circulation of water in the most efficient manner.
1000
THOMAS PRESCOTT,.
Agent for Applicant.

page_text: An Improved Combined Fire-box and Water Tube Steam Boiler.
I, JOHNSON MILLS of Keppel Road Chorlton-cum-Hardy in the County of
Lancaster 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 :-
The improvements which are the subject of this invention relate to the application
to water tube steam boilers of a water chambered fire-box or boxes, which are or may
be of the flue tube construction or other suitable form, in combination with tubes and
pipes for connection with and to said water tube steam boilers, these water chambered
fire-box or boxes in their connection to and combination with water tube steam
boilers being placed in the position usually occupied by the furnaces of water tube
steam boilers this combination of fire box or boxes with the tubes or pipes attached
thereto are connected to and in combination with the several tubes and drums of
water tube steam boilers: The objects of this invention are to utilize in the generation
of steam the greatest possible amount of heat given off in radiation while the fuel is
in combustion and to save the very heavy and frequent expense of renewing the
brick work which is requisite to furnaces of water tube steam boilers.
By the arrangement of the flue furnace which in this invention is formed by the
water chamber or tube which surrounds the fire, the radiant heat is more efficiently
absorbed and utilized in the production of steam in lieu of being largely wasted as
hitherto by absorption with brick walls which in the present forin of construction
enclose the furnaces of water tube steam boilers, and further the hot gases produced
by the complete combustion of the fuel pass forward through the several sets or nests
or parts of the water tube steam boiler and are, thoroughly utilized: In order more
clearly to describe this my invention I have annexed hereunto three sheets of
drawings: In the several views therein shown similar letters refer to similar parts:
Fig. 1. is transverse section and Fig. 2 is longitudinal section of a water tube steam
boiler showing the application thereto of a flue tube fire box or water chambered
furnace constructed in accordance with this invention and placed in the position
usually occupied by the furnaces of existing water tube steam boilers: The sectional
line of Fig. 1. is taken through the line A. B. on Fig. 2. and the sectional line of
Fig. 2 is drawn through the line C. D. on Fig. 1. In these drawings a is the steam
and water drum: 6 and 63 are tubes which are parts of existing forms of water tube
steam boilers and through which the water circulates: b and 63 are tubes which
I employ to form connections between the water chamber e and the drums, tubes or
slabs of water tube steam boilers: c is the 'flue furnace which I construct preferably
of a cylindrical form and which may be either a flanged seam furnace as shown in
Fig. 8 or Fox's patent corrugated flue as represented in Figs. 1 to 6 or of other
suitable construction: d is the water casing which I form of steel or iron of any
strength that may be required: the space e thus left between the flue furnace c and
the outer casing or shell d, and which may vary more or less in capacity according to

page_text: a
requirements, I use as a water chamber: the heat which arises from the combustion
of the fuel in the furnace c is utilized in the generation of steam from the water
contained in the chamber e which surrounds the furnace c instead of being absorbed
and wasted by the bricks walls of which the furnaces in water tube steam boilers are
composed As the water in the chamber e is increased in temperature it becomes
expanded and sets up a circulation through the several parts of the boiler:
I place
mud and water drum fin a transverse position at the rear end of boiler,and I connect
said mud and water drum with the water chamber e of the flue tube fire box. by means
of the tubes 6 and to rear end of steam and water drum a and the tubes 62 by means
of long nipples which are expanded in their respective positions :
In forming
the connection between the upper part of water chainber e of flue tube fire box and
the front portion of steam and water drum a any preferable means may be employed.
In the drawings hereunto annexed Figs. 1 and 2, sheet 1, the connection is shown
formed by means of the tubes bas herein before described: Figs. 3 and 4 and
Figs. 5 and 6, sheet 2 are respectively transverse and longitudinal sections of the
same boiler in which the connections are shown formed of flanged wrought iron, steel,
or other metal pipes . These pipes may be placed either in the positions shown on
drawings or they may be otherwise suitably attached. Figs. 7 and 8 are transverse
and longitudinal sections of the same boiler in which the connection is shown between
the upper part of water chamber e of flue tube fire box and front portion of steam and
water drum by means of short tubes or nipples g which are connected with the
headers : The connection between the water chamber e of flue tube fire box and
the mud and water drum may be formed either by means of tubes 63 as shown in
Fig. 2 herein before described or with flanged wrought iron, steel, or other metal
tubes or pipes as shown in Figs. 9 and 10 sheet 3.
The tubes 3 or pipes may also be connected with the steam and water drum at
the rear end of the boiler by means of tubes or pipes direct, in lieu of passing through
the tubes & and rear headers: The herein above described flue tube fire box may be
supported by girders j, by brackets or by other suitable appliances, or may be
supported either whole or in part by the tubes b which connect said fire box to steam
and water drum.
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. In a water tube steam boiler or in connection or combination with the several
tubes and drums which form water tube steam boilers and connected therewith by
water tubes, pipes, or water slabs, the application and use of a water chambered
fire box or boxes which may be used as a furnace and placed in the position usually
occupied by the furnaces of water tube steam boilers, for the purpose and sub-
stantially in the manner as herein before described and illustrated.
2nd. In a water tube steam boiler the arrangement of tubes or of pipes as shown on
drawings for connecting the water chamber e with the steam and water drum a and
the water and mud 'drum ƒ substantially in the manner and for the purpose as herein
before described.
Dated this 6th day of February 1889.