Improvements in Water Tube Steam Boilers.
Year: 1896

page_text: Date of Application, 19th Mar., 1896-Accepted, 13th Mar., 1897
COMPLETE SPECIFICATION.
Improvements in Water Tube Steam Boilers.
I, ALFRED FERNANDEZ YARROW, of Isle of Dogs, Poplar, in the County of London,
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 :-
My invention relates to the construction and arrangement of water tube steam
boilers in such a manner as to provide a central uptake or chimney for the combustion
gases as I shall describe referring to the accompanying drawings.
Fig. 1 is a transverse section of one form of boiler according to my invention, in
which the two sets of tubes cross each other,
Fig. 2 is a transverse section of a modified form in which the two sets of tubes
approach but do not cross each other, and
Fig. 3 is a half transverse section and part end view of a modified form in which all
the tubes ascend from a single water chamber.
Figs. 4 and 5 are diagrams shewing two different courses for the combustion gases
through the tubes arranged as in Fig. 3.
When the tubes are arranged as in Fig. 1 connecting the right and left lower
chambers A with the left and right upper chambers B respectively so that they cross
each other at C, passage for the combustion gases is obstructed at C where the tubes
cross, and these gases must therefore pass first to each hand outwards below the
crossing, and then from each hand inwards above the crossing to the central
uptake D.
In the arrangement shewn in Fig. 2 there is free passage for the gases outwards
between a and b on each side, and then inwards between c and d, the parts between
b and c being obstructed by the tubes being close together, or in any other well
known manner, so as to form as it were a wall of tubes. The outer tubes in like
manner form walls on each side.
The flames and combustion gases are consequently made to take the course indicated
by the arrows first outwards, then upwards and finally inwards to the central
uptake D.
In Fig. 3 the tubes are spaced apart to give passage from g to hand from k to
but form walls from g to i and from 1 to m so that the gases have to follow the course
indicated by the arrows, first inwards then downwards then finally inwards again and
up to the central uptake D.
As shewn in Fig. 4 the tubes are set apart to give passage from n to o and from
p to q, being close from o to r and from s to p.
As shewn in Fig. 5 the gases are free to pass through the body of tubes throughout
their height.
The courses of the heated gases as described can be directed either by the tubes
themselves being brought close together forming walls or these walls inay be formed
by fins on the tubes or in any other known way.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A water tube steam boiler having two upper steam and water chambers, with
passage between them to a central uptake, substantially as described.

page_text: 2. A boiler having the tubes which connect its two upper chambers with two
lower chambers crossing each other substantially as described with reference to
Fig. 1.
3. A boiler having carved tubes connecting its two upper chambers with two lower
chambers and arranged so as locally to obstruct passage of the combustion gases,
substantially as described with reference to Fig. 2.
4. A boiler having its two upper chambers connected to a single lower chamber
by two sets of tubes, having between the two sets a passage to a central uptake, and
having a fire grate outside of each set, substantially as described with reference to
Figs. 3, 4 and 5.
Dad: 101
1000
ABEL & IMRAY,
Agents for the Applicant.