An Improved Feed Water Heater, and Supplementary Steam Generator and Economiser.
Year: 1895

page_text: Date of Application, 7th Dec., 1895
Complete Specification Left, 29th Feb., 1896-Accepted, 9th May, 1896
PROVISIONAL SPECIFICATION.
An Improved Feed Water Heater, and Supplementary Steam
Generator and Economiser.
I, SAMUEL ALBERT JOHNSON of 130 High Street Poplar, London, E.
Marine Engineer, do hereby declare the nature of this invention to be as
follows:
This invention relates to certain improvements for intercepting and utilizing
waste heat whilst passing through the flues of land or other boilers, which I propose
to effect in the following manner, viz. :-
At a suitable distance apart from the rear of the fire bridge 1 place in position
within the flue of the boiler a semicircular or other form of water tight chest or
chamber of suitable proportions, the end of which would be so formed as to be
capable of receiving a series of tubes, these tubes would be spaced apart and led
in a horizontal or suitable direction through the boiler flue into that of the ordinary
flue or connecting passage way, within which they would be upwardly bent or
shaped into a vertical or approaching vertical direction. A tube plate would be
provided to suitably receive the ends or upper vertical or like portions of the tube
series as the case may be wherein they would be securely fitted. A suitable dome,
steam chest or chamber would also be provided having a flanged plate at the base
thereof which would be bolted down or otherwise connected to the tube plate
suitably supported within the ordinary outer or immediate connecting flue or
passage way to that of the boiler flue.
A pipe or tube would be provided and suitably fitted to the said semicircular
chest or tube box chamber, which would be connected and fitted to the under part
of the boiler thereby enabling the water to freely circulate therefrom into that of
the semicircular chest or tube box chamber, likewise into the series of tubes fitted
and connected thereto. A suitable steam pipe connection would also be provided
and fitted to and from the upper portion of the main boiler to that of the auxiliary
steam chest or dome having the series of tubes connected thereto and in
communication therewith in manner previously described.
It will therefore be seen that all flame and heated gases passing through the
boiler flue will be readily intercepted and taken up by the series of separated tubes,
the greater part or length of same being entirely within the boiler flue and connected
as in manner described to the semicircular or like form of tube box or chamber
within a short distance of the back of the fire bridge, the exterior of the said tubes
being thereby always exposed to the intensity of heat surrounding same, the
continuations or upward bent portions thereof within the connection flue heing
likewise affected, and the supplementary steam thereby generated entering
into the said steam chest or dome will pass directly therefrom into that of the
main boiler.
In the case of furnaces having cross tubes or tubes otherwise disposed therein
the water tubes according to my method would be arranged on each side of such
tubes. In some instances the series of tubes instead of being placed within the
boiler flue itself may in some cases be arranged vertically or otherwise, but apart
from one another and fitted in a circular tube plate or the like fixed in position
within the adjoining flue space to that of the boiler flue. The said circular tube
plate being connected or coupled to a steam chest or chamber which is also connected

page_text: or caused to be in communication with the main boiler in manner previously
described. Towards the bottom of the boiler the vertically disposed series of tubes
would be curved or shaped into a right angular direction or thereabouts and be led
immediately outside and under the boiler in its length within the flue continuation,
and connected and fitted to a suitable form of water tight chest or chamber suitably
situated toward or at the front of the boiler and in communication there with as in
manner herein before referred to.
D
1
100-
An Improved Feed Water Heater, and Supplementary Steam
Generator and Economiser.
I, SAMUEL ALBERT JOHNSON of 130 High Street Poplar, E. 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 and accompanying drawing:
--
This invention relates to certain improvements for intercepting and utilizing
waste heat whilst passing through the flues of land or other boilers, which I propose
to effect in the following manner viz. :-
At a suitable distance apart from the rear of the fire bridge I propose in some
cases to place in position within the flue of the boiler a semicircular or other suitable
form of water tight chest or chamber of necessary proportions, the outer end of
which would be so formed as to be capable of receiving a series of tubes to be
securely fitted therein, these tubes would be spaced apart and led in a horizontal
or suitable direction through the boiler flue into the ordinary connecting flue or
passage way within which they would be bent upwardly or shaped into a vertical
or approaching vertical direction. A tube plate would be provided to suitably
receive the ends or upper vertical or like portions of the tube series, as the case
may be, wherein they would be securely fitted. A suitable dome, steam chest or
chamber would also be provided having a flanged plate at the base thereof which
would be bolted or otherwise coneected to the tube plate, and be suitably supported
within the ordinary outer or immediate connecting flue or passage way to that of
the boiler flue connection.
A pipe or tube would be provided and suitably fitted to the said semicircular
chest or tube box chamber and connected to the under part of the boiler, thereby
enabling the water therein to freely circulate therefrom into the semicircular_water
tight chest and water tubes in connection therewith. But in some cases I may
prefer to provide and fit a like pipe or tube connection to and from the rear of the
upper portion of the boiler and suitably connect same to the lower portion of the
supplementary steam chest or chamber as previously referred to.
A suitable steam pipe connection would also be provided in either case and fitted
to and from the upper portion of the main boiler to that of the auxiliary steam
chest or chamber having the series of tubes connected to the lower portion thereof
and in communication therewith in manner previously described.
It will therefore be seen that all flame and heated gases passing through the
boiler flue will be readily intercepted and taken up or absorbed by the series of
tubes, separated apart from one another, the greater part or length of same would,
as in this instance, be so disposed entirely within the boiler flue and connected, as
in manner before described, to the semi-circular or like form of tube box or chamber
within a short distance of the back of the fire bridge, the entire exterior of the
said tubes being thereby always exposed to the intensity of heat and flame, the
continuations or upwardly bent portions thereof, within the connection flue, being

page_text: likewise effected, so that the supplementary steam thereby generated and entering
into the said steam chest or dome, passing direct therefrom into that of the main
boiler by means of the steam pipe or tube connection as provided from one to the
other in manuer previously described.
In the case of furnaces having cross tubes, or tubes otherwise disposed therein,.
the water tubes according to my method would be so arranged as to pass on each,
side and clear of same.
In some instances the series of tubes instead of being placed within the boiler
flue itself may in certain cases be arranged vertically or otherwise disposed in the
hot air or flame course immediately outside the boiler and suitably connected to
the auxiliary steam dome or chamber in communication with the main boiler, the
said tubes being spaced apart and curved at their lower ends or parts and led
immediately outside and horizontally under the bottom of the boiler toward the
front of the boiler within the flue continuation, (as in the case of a horizontally
fixed boiler) where they would be connectel and fitted to a suitable form of water
tight chest or chamber in communication with the lower or other portion of the
main boiler as in manner before referred to.
In the accompanying drawing Figure 1, is a longitudinal section of a horizontal
boiler shewing the method or system I propose to employ for heating feed water
and as a supplementary steam generator and economiser: wherein A is the ordinary
fire bridge. B is a semicircular or other suitable form of water tight chest or
chamber capable of receiving a series of tubes CC, which are securely fitted
therein and led through the boiler flue D into the connecting flue E. The tubes CC
are bent or curved from the horizontal into a vertical direction and at their upper
ends are fitted into a tube plate F. G is a steam chest or chamber having a
flanged plate H, at its base which is intended to be securely connected to the tube
plate F. J is a pipe or tube connecting the upper or rear portion of the main
boiler with the steam chest or chamber enabling the water to freely circulate.
therefrom and keep the tubes CC constantly supplied and filled with water.
Figure 2 is likewise a longitudinal view of a horizontal boiler partly in section.
wherein the tubes C¹ C', in this case are shewn as disposed in the hot air or flame-
course immediately outside the boiler and in like manner suitably connected to a
water tight chest or chamber B', at or toward the forepart of the boiler within the
flue continuation. The said water tight chamber B¹, made to communicate with
the under part of the main boiler by means of the tube or pipe connection J.
The water tubes C¹C₁ are in similar manner as before described curved or led
upwards and securely connected and secured to the tube plate F¹ and to that of
the steam chest or dome G¹. J' is the tube or pipe likewise connecting the steam
chest G'at its upper part to that of the main boiler. In either case a shut or
cut off valve K and K as the case may be would be provided for use as
required.
Figure 3, is a cross sectional view of the semicircular water tight chest or
chamber to receive the water tubes.
Figure 4 is a sectional view of the tube plate connected to the steam
chamber.
Fig. 5, shews partly in section the method of securing the tubes C to the semi-
circular water tight tube-chest or chamber B. As will be seen, on each tube
washers and nuts L and L' are fitted on each side of the tube-chest over the outer
nuts L suitable outer caps M would likewise be provided and fitted.
A slotted opening or openings N, is or are made and provided in that portion of
the tubes, fitted and arranged within the said semicircular chamber, tube chest, or
box B, for the purpose of permitting free circulation of water throughout. P and
Qare tubes as shewn in Figure 1, one being intended for the "feed supply" and the
other as for the "blow-off."
In the case of the class of boiler known as the French or 66
Elephant" type or like
class of boiler the tubes would lead over the front of the fire to the front.
of the boiler.

page_text: 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 :-
1. Utilizing and absorbing the waste heat either immediately from inside the
boiler at the back of the fire bridge where the temperature of heat is in its highest
state or immediately under the boiler in the flue thereof by and through a series
of tubes fitted, arranged and disposed as in manner herein described and illustrated
adapted to suit the particular class or type of boiler as the case may be.
2. Utilising and absorbing the waste heat in the class known as the French or
Elephant" type of boiler where the series of water tubes may be further led
immediately over the fire toward the front of the boiler.
3. The method of leading the tubes into a chest or chamber whereby they are
caused to act as stays thereto and in forming slots or openings in the said tubes
therein to permit of free circulation being insured.
Dated this 29th day of February 1896.
S. A. JOHNSON.