Improvements in Steam Boilers.
Year: 1889

page_text: Date of Application, 16th July, 1889-Accepted, 31st Aug., 1889
Improvements in Steam Boilers.
I HERBERT JOHN HADDAN of the Firm of Herbert & Co., Patent Agents of
18 Buckingham Street Strand W.C. in the County of Middlesex, Civil Engineer
do hereby declare the nature of this invention a communication to me from
abroad by Allan Stirling of New York in the United States of America,
Engineer 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 certain improvements in water tube boilers, as
pointed out in the following specification and claims and illustrated in the
accompanying drawing; in which
Fig. 1 represents a transverse vertical section in the plane y y Fig. 2.
Fig. 2 is a longitudinal vertical section in the plane Fig. 1.
Similar letters indicate corresponding parts.
Heretofore in the socalled water tube boilers in which the water is in the
tubes and the flame outside the tubes have usually been inserted in headers made
of cast metal, so arranged that a number of tubes have only one outlet to the
steam and water space above and to the mud drum beneath.
In these boilers there is no circulation through the mud drum and the
enormous velocity of the currents in the outlets to the steam and water space
is detrimental to the boiler and precludes a proper circulation. Water tube
boilers as heretofore constructed have also been found objectionable, because
of the large space which they occupy and the large number of hand holes with
covers and bolts necessary to get at the inside of the tubes for cleaning and
it has also been found impossible to get at the outside of the tubes to clean
them from soot. These disadvantages have been obviated by this invention.
In the accompanying drawing the letter A designates the mud drum and
A' A are the steam and water drums. B 1 are the water tubes connecting
the mud drum A with the upper drums A A B are water tubes and B
steam tubes connecting the two upper drums. Each of the drums is provided
with a man hole E through which access can be had to its interior.
On the outside of the mud drum are secured the journals L in which the
pipe G can be freely turned by means of a lever K. The pipe G connects by
a pipe G with the steam space of one of the upper drums and it is provided
with a series of branch tubes or nozzles H which are so distributed that they
can swing through the spaces between the water tubes B extending from the
mud drum A to the upper drum A¹.
W. W. is the brick setting. D is the fire brick arch of the furnace. C is
the fire brick partition and M are the grate bars.
From this description it will be seen that in this boiler each of the water
tubes B has an independent outlet to the steam and water drum above and
also an independent outlet to the mud drum below, the boiler being constructed
of wrought metal and so arranged that the water is forced to pass through the
mud drum and deposit its sediment therein Only three manholes are necessary
for complete access to every part, and the outside of those water tubes on
which the soot is formed can be readily cleaned by means of the steam nozzles H.
The two sets of tubes are connected into the upper drums so as to allow for

page_text: the expansion and contraction. For this purpose each of the water tubes B
is curved at one or both ends.
The brick arch ]) of the furnace aids materially in the proper combustion
of the gases, and the peculiar arrangement of this arch and the fire brick
partition, direct the gaseous products of combustion so that they pass over
every part of the heating surface and so break up the currents as to extract the
available heat therefrom.
As seen from Fig. 1 the flame on striking the arch D is thrown between the
water tubes 13 leading into the drum A and the partition C compels the flame
to ascend between said water tubes and after it has passed the top edge of this
partition it descends between the water tubes B which lead from the drum A
into the drum A. A shelf which projects from the partition C compels the
Hame to pass between the pipes B. The feed water is introduced into the
drum A at L.
;
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that
what I claim is .-
1. A water tube boiler consisting of the single mud drum A, the two elevated
steam and water drums A' A2, the water tubes 13, connecting the water spaces
of the steam and water drums, the steam tubes 132 connecting the steam spaces
of said steam and water drums and two sets of water tubes B B directly con-
nected, respectively at their upper ends with the steam and water drums and
both sets connected at their lower ends with the single mud drum substantially
as described.
2. A water tube boiler consisting of a furnace structure, a single mud drum A,
the two elevated steam and water drums A¹ A2, having their steam and 'water
spaces respectively placed in communication, two sets of water tubes B B'directly
connected respectively at their upper ends with the steam and water drums
and both sets connected at their lower ends with the single mud drum the
fire brick arch 1 extending over the fire place from the wall of the furnace
structure to the front set of water tubes and the fire brick partition C inclined
between the two sets of water tubes and located between the single mud drum
and the two steam and water drums substantially as described.
3. The combination with the water tubes of a boiler, of an axially rotating
steam pipe G having branch tubes H adapted to move between the water tubes
and means for axially rotating the steam pipe to swing the branch tubes
between the water tubes substantially as described.
Dated this 16th day of July 1889
HERBERT & Co.,
18, Buckingham Street, London, W.C., Agents to Applicant.