A Combined Feed Water Heater, Draught Inducer, and Smoke Preventer.
Year: 1891

page_text: Date of Application, 4th June, 1891
Complete Specification Left, 4th Mar., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
A Combined Feed Water Heater, Draught Inducer, and Smoke
Preventer.
I, THOMAS HOSKING of 28 South Castle Street Liverpool, Engineer do hereby
declare the nature of this invention to be as follows:-
This invention relates to an arrangement whereby the exhaust steam from a high
pressure engine is utilized first to heat the feed water and then to induce a current
of heated air to increase the draught of the furnace and to prevent smoke.
According to my present invention I lead the exhaust steam to a feed heater in
which are a number of tubes, through which the exhaust steam passes and round
which the feed water flows on its way from the feed pump to the boiler, being. thus
raised in temperature. The exhaust steam which leaves the feed heater is led
through a pipe surrounded by a larger open ended pipe, the smaller pipe terminating
in a contracted nozzle within the larger pipe, the exhaust steam thus inducing a
current of heated air in the well known manner.
This induced current of air together with the steam is led to the furnace, either
above or below the bars, or both, thus causing an increased draught and preventing
smoke..
The exhaust steam after passing through the feed water heater may if desired
be led direct into the furnaces above or below the bars, jointly or separately, or into
the chimney, or both.
Dated this 3rd day of June 1891
SLOAN & LLOYD BARNES,
Castle Chambers, 26, Castle Street, Liverpool,
Agents for the Applicant.
COMPLETE SPECIFICATION.
A Combined Feed Water Heater, Draught Inducer, and Smoke
Preventer.
I, THOMAS HOSKING, formerly of 28 South Castle Street, but now of 1 Thomas
Street, Liverpool, 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 an arrangement whereby the exhaust steam from a high
pressure engine is utilised first to heat the feed water and then to induce a current
of heated air to increase the draught of the furnace and to prevent smoke.
In the accompanying drawings
Fig. 1 is an elevation of my invention applied to a horizontal steam boiler, the
feed water heater and draught inducer being shown in section.
Fig. II is a sectional partial elevation on the line A, A, of Fig. I.
Throughout the drawings similar parts are indicated by the same reference
figures, and in the case of sections, the direction in which they are viewed is
indicated by the small arrows placed adjacent to the letters denoting the plane of
section.
1 is the feed water heater consisting of an outer casing enclosing the tubular
worm 2 which is in the form of a double helix; the feed water enters the feed
heater by the pipe 3, flows through the outer helix of the worm, then through the
inner helix, the two helices being continuous, finally leaves the feed heater by the
pipe 4 and enters the boiler by the feed check valve 5, being heated during its

page_text: transit through the worm by the exhaust steam from the engine which enters the
casing of the feed heater by the pipe 6 and leaves hy the pipe 7.
The pipe 7 ends in the contracted nozzle 8 which is surrounded by the open bell
mouthed air inlet pipe 9; the exhaust steam which escapes condensation in the feed
heater issues by the nozzle 8 and induces a current of air in the well known
manner, the air being heated by the steam, and the mixed current of heated air and
steam flows along the trunk pipe 10 and is admitted to the furnaces, above or below
the fire bars at will through the branch pipes 10 and 10" respectively,
the
admission being regulated by the stop valves 12 and 12' respectively.
The air and steam admitted above the fire bars is directed downwards by the
nozzles 13 and prevents smoke; that admitted below the bars through the nozzles 14
cools the bars and assists combustion; the nozzles 14 are widened out horizontally
in the form of a fan in the manner described and illustrated with reference to
somewhat similar nozzles in the complete Specification of my prior application for
Letters Patent Number 9250 of 1891, the object being to deliver the current of air
and steam in a thin sheet and so distribute it well below the fire bars.
In a simpler form of my invention the air inlet 9 is dispensed with and the pipe 10
is made continuous with the pipe 7 so that the steam after leaving the feed water
heater is simply delivered as jets above and below the fire bars and, by means of a
branch pipe from 7, into the chimney, cocks or valves being provided so that any
one or more of the jets may be used at will.
No claim is made herein to the details of construction of the feed water heater,
and any of the well known forms of apparatus for transmitting heat from steam to
water without admixture may be substituted for that illustrated. 15 is a drain
cock for draining of water resulting from condensation of the steam; this water is
led to the suction pipe of the feed pump.
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). The combination of a feed water heater through which the exhaust steam
from an engine is passed and in which feed water is heated by the said steam, a
draught inducer operated by the steam which leaves the said feed water heater,
and a nozzle or nozzles whereby the induced current of heated air and steam is
delivered to the boiler furnaces substantially as described.
(2). The combined feed water heater, draught inducer and smoke preventer
substantially as described and shown in Figs. I and II.
11 of Manah 1900
SLOAN & LLOYD BARNES,
Castle Chambers, 26, Castle Street, Liverpool,
Agents for the Applicant.