Improved Fuel Economiser or Apparatus for Heating the Feed Water of Boilers by Means of the Waste Products of Combustion.
Year: 1897

page_text: Date of Application, 15th Feb., 1897
Complete Specification Left, 15th Nov., 1897-Accepted, 29th Jan., 1898
PROVISIONAL SPECIFICATION,
Improved Fuel Economiser or Apparatus for Heating the Feed Water
of Boilers by Means of the Waste Products of Combustion.
66
FRANK EVELEIGH, Engineer, 66, Dairy House Road, Derby, in the County of
Derbyshire, and PERCY HASSALL MELLOR, Engineer, Tresco," Burton Road,
Woodville, in the County of Derbyshire, do hereby declare the nature of this
invention to be as follows:-
"
This improvement relates to a method of arranging the tubes of an Economiser"
in the flue through which heated gases from one or more boilers pass, in such a
way as to enable any one of them to be more readily replaced or cleaned or
repaired, and so as to secure the greatest efficiency.
It consists of an assemblage of rows of vertical wrought iron or steel tubes, or
tubes of any other suitable metal, each row of tubes being connected together at
the top by means of a "collector or box preferably of cast iron, and each collector
is connected to the next by a suitable elbow pipe preferably above or beneath it.
The top, or open end, of each tube is fixed to its collector with studs and flanges
or other suitable means, and the bottom is closed with a screwed plug or other
form of cap.
The collectors form joint one to the other, and hang from their ends which rest
on special plates fixed on the walls which enclose the apparatus.
So that evacuations of sediment &c. can be made by pressure into a special pipe
leading it away, each collector has an oblong "chamber" cast or fixed on its top
outside, and running for some distance along it. To suitable holes in the bottom
of this "chamber" open ended tubes of smaller diameter than those above men-
tioned are fixed each one passing downwards through the collector into the larger
pipe below to within a short distance from the bottom of the latter.
Suitably placed plugs or lids are fixed in the oblong chamber tops-one above
each pipe to which access is thus attainable.
Each "chamber" is connected to the adjacent one by means of a suitable pipe,
and this is so arranged that any two or three adjacent chambers are connected
together from which sediment can be blown off independently of the others.
The feed water passes through the collectors in succession and the heat of the
waste gases is communicated to it by means of the tubes, the cooler water settling
into them and the hotter rising and taking its place until it leaves the apparatus
and flows into the boiler. The increase of its temperature will vary within certain
limits according to the number of tubes-the speed of the water, and the tempera-
ture of the hot gases in which the apparatus fixed.
Suitable feed, delivery, blow off, and safety valves can be fixed to the apparatus.
Scrapers worked mechanically keep the pipes free from soot and are suspended

page_text: and worked in such a way that their arrangement does not interfere with the
taking out of any row of pipes for repairs, cleaning or examination whenever
necessary.
2
F. EVELEIGH.
P. H. MELLOR,
Improved Fuel Economiser or Apparatus for Heating the Feed Water
of Boilers by Means of the Waste Products of Combustion.
We, FRANK EVELEIGH, Engineer, of 66, Dairy House Road, Derby, in the
County of Derbyshire, and PERCY HASSALL MELLOR, Engineer, "Tresco," Burton
Road, Woodville, in the County of Derbyshire, 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:-
This improvement relates to a method of arranging the tubes of an
economiser
"
in the flue through which heated gases from one or more boilers pass, in such a
way as to enable any one of them to be more readily replaced or cleaned or
repaired, and so as to secure the greatest efficiency.
وو
It consists of an assemblage of rows of vertical wrought iron or steel tubes, or
tubes of any other suitable metal, each row of tubes being connected together at
the top by means of a collector or box preferably of cast iron, and each collector
is connected to the next by a suitable elbow pipe preferably above or beneath it.
Figure 1 is a plan of part of an apparatus constructed according to this invention
and Figures 2 and 3 are sections on the lines 2-2 and 3-3 Figure 1 most of the
tubes being shown in elevation.
a are collectors having chambers at the top. care tubes hanging from the
collectors and opening into them and having their lower ends closed by plugs c¹. d
are tubes open at both ends fixed to the bottoms of the chambers b.
ee are the
side walls having plates el el at the top on which the ends of the collectors a "est.
f are plates between each set of four (or it might be any other number) collectors.
y are scrapers working up and down on the tubes c being connected in pairs in the
usual way by chains g working over pulleys g² every other one being driven by
worms on the shaft which is rotated first in one direction and then in the other
in any usual way. All the scrapers are not shown in the drawings but it will be
understood that there is one double scraper composed of two rings for each tube c.
jis the feed water supply pipe and are elbow pipes connecting each collector to
the next the connections being at alternate ends.
The feed water passes through the collectors in succession and the heat of the
gases is communicated to the water by means of the tubes, the cooler water settling
into them and the hotter rising and taking its place until it leaves the apparatus
and flows into the boiler from the last collector. The increase of its temperature
will vary within certain limits according to the number of tubes-the speed of the
water, and the temperature of the hot gases in which the apparatus is fixed.
7 are pipes connecting the chambers to the pipe m through which the sediment
is blown out. If it be desired to blow out the sediment from each set of tubes d 4
or from two adjacent sets independently of the others suitable valves are placed on
the pipes. Instead of drawing off the heated feed water from the last collector
it may be drawn off from the pipe m in which case the flow is down the tubes c
and up the tubes d. n are plugs in the top of the chambers b to give access to the
Tubes d.

page_text: It will be seen that by undoing the bolts securing the flanges of two of the
bends and of one of the pipes / any collector a with its tubes can be lifted out for
repairs independently of the others and without the necessity of pulling down any
of the brickwork.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is: :-
1. Economisers in which the tubes are connected together in sets by collectors
each capable of being taken out of the apparatus independently of the others.
2. The combination of a collector, tubes closed at the bottom opening into and
hanging from it, a chamber above it and smaller tubes open at both ends hanging
from the chamber inside the first tubes.
3. The combination with apparatus such as is referred to in the preceding claims
of scrapers on the tubes and apparatus for moving the scrapers up and down such
apparatus being so placed as to leave a clear space above the collectors.
4. Economisers substantially as described and shown in the drawings.
Dated this 11th day of November 1897
FRANK EVELEIGH.
PERCY HASSALL MELLOR.