Improvements in Water-tube Steam Boilers.
Year: 1898

page_text: Improvements in Water-tube Steam Boilers.
I, JAMES YATE JOHNSON, of 47, Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been
communicated to me from abroad by The Société Anonyme du Temple, of
39, Rue de Paris, Cherbourg, in the Republic of France,) to be as follows:-
This invention relates to the class of water-tube return-flame boilers having
accelerated circulation.
The invention is applicable to boilers heated by either liquid or solid fuel.
The boiler mainly consists of a collector joined by sets or bundles of tubes, to
three distributors,--one on either side and one in the centre.
The first two rows of tubes connecting the side distributors to the collector are
close fitting save at one end of the boiler where they afford a passage for the
combustion gases entering between the other tubes set apart. Thus I have a
"return flame" boiler with the flame returning either in front or in the rear
according to the position of the chimney.
The central distributor is connected to the collector by a cluster of thibes con-
sisting for example of six sets of narrow tubes, the tubes of the two central sets
being arranged in the same plane and forming a partition which divides the
combustion chamber.
This arrangement permits the direct heating surface of the boiler, and
consequently its evaporating power, to be very materially increased.
The central distributor is connected to the two side distributors by junction tubes
of larger size than the tubes of the sets or clusters. the number of such junction
tubes being sufficient to ensure a proper feed in the central distributor at the
time when vaporisation is proceeding most actively and at the quickest rate.
The junction tubes serve to complete the circuit of the water, to be converted
into steam which descends through those tubes of the set which are least heated (the
water-return tubes being dispensed with), and flows partly into the side distributors
and partly into the central distributor after which it re-ascends and, as it does so
becomes converted into steam in the top collector.
The said junction tubes furthermore enable the distributors to be firmly braced
up by means of suitable cross ties to ensure the desired rigidity of the boiler and
where liquid fuel is used they serve as a frame-work or skeleton for the support of
the fire resisting sole plate.
Dated this 10th day of August 1898

page_text: Improvements in Water-tube Steam Boilers.
I, JAMES YATE JOHNSON, of 47, Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been
communicated to me from abroad by The Société Anonyme du Temple, of
39, Rue de Paris, Cherbourg, in the Republic of France,) 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 the class of water-tube return-flame boilers having
accelerated circulation.
The invention is applicable to boilers heated by either liquid or solid fuel.
In the accompanying drawings Figure 1 is a side elevation of the boiler partly
in section chiefly intended to illustrate the arrangement of the connecting
tubes;
Figure 2 is a front elevation thereof, part of the front wall being removed
so as to expose to view the internal set or cluster of tubes; and
Figure 3 is a sectional plan of the said set or cluster of tubes in the right hand
portion of the boiler, also showing the spray producer which (as shown in Figure 1)
may be arranged either in front of the boiler as at P1, or in the rear thereof,
as at P2, according to the position of the lateral tube clusters.
The boiler mainly consists of a collector 1 joined by sets or bundles of tubes, 4, to
three distributors, one on either side, as at 2, 2, and one in the centre, as at 3.
The first two rows of tubes, 5, 5, connecting the side distributors 2,2 to the
collector are close-fitting, save at one end of the boiler, where they afford a
passage for the combustion gases entering between the other tubes 4 set apart.
Thus I have a return flame" boiler with the flame returning either in front or in
the rear according to the position of the chimney.
The central distributor 3 is connected to the collector 1 by a cluster of tubes 6,
consisting for example of six sets of narrow tubes, the tubes of the two central sets
being arranged in the same plane and forming a partition 7 which divides the
combustion chamber.
This arrangement permits the direct heating surface of the boiler, and
consequently its evaporating power, to be very materially increased.
The central distributor 3 is connected to the two side distributors 2, 2, by junction
tubes 8 of larger size than the tubes of the sets or clusters, the number of such
junction tubes being sufficient to ensure a proper feed in the central distributor 3
at the time when vaporisation is proceeding most actively.
The junction tubes 8 serve to complete the circuit of the water to be converted
into steam which descends through the tubes of the set which are least heated
(the water-return tubes being dispensed with) and flows partly into the side dis-
tributors 2,2, and partly into the central distributor 3, after which it re-ascends
and, as it does so becomes converted into steam in the top collector 1.
The said junction tubes 8 furthermore enable the distributors 2, 2, and 3 to be
firmly braced up by means of suitable cross ties to ensure the desired rigidity of
the boiler and where liquid fuel is used they serve as a frame-work or skeleton
for the support of the fire resisting sole plate.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A return-flame water-tube boiler having accelerated circulation without return
of the water. comprising a collector communicating through sets of tubes with three
4

page_text: distributors, two of which are lateral, and one central; such central distributor
being connected to the two lateral distributors by tubes sufficient in number to
ensure an adequate water supply in the said central distributor while vaporisation is
proceeding most actively substantially as described.
2. A return flame water-tube steam boiler constructed substantially as herein-
before described with reference to the accompanying drawings.
Dated this 11th day of A 1900
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.