Improvements in or relating to Economisers for Use in connection with Steam Generators.
Year: 1896

page_text: Date of Application, 11th Mar., 1896-Accepted, 11th Apr., 1896
COMPLETE SPECIFICATION.
Improvements in or relating to Economisers for Use in connection
with Steam Generators.
I, HUGH MPHAIL, of The Towers, Wakefield, in the County of York,
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:-
This invention relates to economisers for heating the feed water of steam
generators and has for its object the provision of means whereby the steam whether
superheated or not coming from the generator can be passed in tubes into or
through the economiser for further heating the feed water, and also, if the steam is
superheated, for modifying its temperature. For carrying my invention into
practice I provide, in the economiser, steam tubes connected with the generator
direct or with the main steam pipe or with a superheater so as to convey the steam
to the economiser, and a return connection for conveying the water of condensation
to the generator.
Referring to the accompanying drawings,
Figure 1 is a sectional end elevation of a modified form of Green's economiser
adapted for carrying out my invention.
Figure 2 is a vertical section of an economiser illustrating another mode of
carrying my invention into practice.
Figure 3 is a vertical longitudinal section of the outlet header.
A, A are the vertical pipes connected at top and bottom to boxes B, C
respectively. The latter box is, in the construction shown in Figure 1, furnished
with two compartments C1 C2 the first of which is in direct communication with
the pipes A through the lower open ends of the said pipes. The other
compartment C2 is in communication with a number of small tubes D arranged
within the pipes A and extending towards the upper ends of said pipes. The
tubes I are closed at their upper ends. The compartment or chamber C² is in
direct communication with the generator or with the main steam pipe of the
generator or with the superheater so that steam can enter the pipes D and thus
further heat the water in the economiser pipes A. Any condensation water formed
in the tubes and compartment C2 will gravitate back to the generator or will be
returned by a pump or injector or otherwise, or it may be used for any purpose
for which hot water is required without being returned to the generator. The
chamber C² instead of being a second compartment of the bottom box C formed
ntegrally therewith may be a separate pipe or box underneath the bottom box, the
ubes D being passed through the bottom box and being secured by nipples or
otherwise. This construction can be applied in various ways to existing economisers
with a minimum of change.
Figure 2 shows an economiser of ordinary construction in which I have inserted
team tubes D, D arranged in the upper and lower boxes B, C and connected with
pipes C2, C² that correspond with the chamber or compartment C² of Figure 1.
The tubes D are closed at their inner ends.
In this instance I have also shown the outlet header E provided with a steam
ube D passing completely through it as clearly seen from Figure 3; in this tube D
he temperature of the steam if superheated may be modified or regulated in
ccordance with the speed at which it is passed through the said tube.

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 :-
The combination, with a circulating or non-circulating feed water heater of the
Green's economiser type, of steam heating tubes such as D arranged in the vertical
pipes, and in the top and bottom boxes and outlet header or any of them and
connected with a steam pipe which is in communication with the steam generator,
substantially as described, and for the purposes specified.
Dated this 11th day of March 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.