Improvements in and relating to Steam Superheaters.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Steam Superheaters.
I, HUGH MCPHAIL, of Manygates House, Wakefield, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to steam superheaters more especially intended for use
with "dry back boilers" of the marine type and consists in arranging the super-
heaters, (which are advantageously constructed as hereinafter described) at the
back end of the steam generator in such a position that the highly heated products
of combustion passing from the boiler flues to the boiler tubes will effectually heat
the superheaters; suitable bafflers being provided, if necessary, for directing the
said heated products of combustion on to the superheaters.
I may employ one or more superheaters each of which preferably comprises two
boxes connected together by a series or nest of U-shaped or ther
suitably bent tubes, one of said boxes being connected with the
steam space in the generator and the other with the engine or other device wherein
the superheated steam is to be utilized. If more than one superheater is employed
they are connected together in any appropriate manner to cause the steam to pass
through them successively, alternately or otherwise. I may locate the two boxes
of each superheater horizontally side by side with their U-shaped tubes in vertical
planes approximately at right angles to the back end of the generator.
Or the said boxes of each superheater may be arranged horizontally end to end
with their bent tubes disposed in a vertical plane approximately parallel with the
back end of the generator.
Or instead of using separate boxes, I may employ a single box having internal
transverse partitions to divide it into the required number of compartments, such
compartments being connected by the aforesaid series of bent tubes."
Dated this 25th day of February 1898.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in and a
I, HUGH MCPHAIL, of Manygates House, Wakefield, in the County of York,
Engineer, do hereby declare the nature of this invention and in what manner the
Price 8d1

page_text: same is to be performed, to be particularly described and ascertained in and by the
following statement:-
This invention relates to steam superheaters more especially intended for use
with "dry back boilers" of the marine type and consists in arranging the superheaters,
(which are advantageously constructed as hereinafter described) preferably at the
back end of the steam generator in such a position that the highly heated products
of combustion passing from the boiler flues to the boiler tubes will effectually heat
the superheaters; suitable bafflers being provided, if necessary, for directing the
said heated products of combustion onto the superheaters.
In order that my invention may be clearly understood and readily carried into
effect I will now proceed to describe the same more fully with reference to the
accompanying drawings in which:-
Figure 1 is a side elevation, and
Figure 2 a back end elevation of a steam generator having my invention applied
thereto.
Figures 3 and 4 are a side elevation and a back end elevation respectively of a
steam generator provided with a modified form of superheater according to my
invention.
Figure 5 is a side elevation and Figure 6 is a back end elevation of a steam
generator provided with a further modification of my invention.
Referring to Figures 1 and 2, A is the steam generator and B is a chamber-at
the back end thereof into which the generator flues C lead. H H are the generator
tubes and B B₁ are the side flues. The superheater consists of two boxes.D, D
connected, together by the series or nest of tubes d, the whole being situated in the
chamber B. The box D is connected with the steam space in the generator by
the pipe E and the pipe F leads from the box D¹ to the point where, the superheater.
steam is to be utilized.
Referring to Figures 3 and 4, the general arrangement is similar to that pre-
viously described but the tubes d are somewhat modified in shape and the
chamber B is provided with a baffler G. In the above figures the steam passes
from the generator through the pipe E to the box D) and thence through the
tubes d to the box D', and in its course, through the said boxes and, tubes becomes.
superheated by the products of combustion entering the chamber B through the
flues C and leaving it by means of the tubes H. The superheated steam is then
conveyed through the pipe F to the point where it is to be utilised.
In Figures 5 and 6 the superheater consists of two pairs of boxes DD',
and D, the boxes of each pair being respectively connected by series of
tubes dd, and the whole being situated in the chamber B. E is a pipe leading
from the steam space in the generator to the box D. J is a pipe connecting the
boxes D and D, and F is a pipe connecting the box D' to the point where the
superheated steam is to be utilised. G is a baffler situated in the chamber B.
In this form of apparatus the steam passes from the generator through the pipe E
to the box D, then through the tubes to the box D*, then through the pipe J to the
box D, then through the tubes d¹ to the box D¹, and thence through the pipe F
to the point where it is to be utilised; the steam in its passage through the super-..
heater becoming superheated by the products of combustion passing through the
chamber B as previously described.
In cases where it is desired to clean the flues from the back end of the generator
the superheaters may be similarly constructed, and arranged at the front end of the
generator in the path of the products of combustion as the latter pass from the
boiler tubes to the side flues.
It is obvious that instead of using a number of separate boxes, I may employ
a single box having a suitable number of internal partitions to divide it into the
required number of compartments, such compartments being connected together by
tubes as aforesaid.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. A superheater for steam generators consisting of a nest or nests of tubes
situated in the path of the products of combustion as the latter pass from the
generator flues to the generator tubes or from the generator tubes to the side flues,
and through which the steam is caused to pass on its passage from the generator to
the point of utilization, for the purpose specified.
2. A superheater constructed, arranged, and operating substantially as herein
described with reference to Figures 1 and 2, or to Figures 3 and 4, or to Figures 3
and 6 of the accompanying drawings, for the purpose specified.
Dated this 9th day of November 1898
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.