Improvements in Steam Blast Apparatus.
Year: 1886

page_text: Date of Application, 17th Dec., 1886.
Complete Left, 24th Dec., -1886.--
Complete Accepted, 25th Feb., 1887.
PROVISIONAL SPECIFICATION.
Improvements in Steam Blast Apparatus.
EDWARD LORIMER MARSDEN of Bridge Street Birkenhead in the County of Chester
Brassfounder and PHILIP HENRY SHENSTONE NICKLIN of No. 33 Lower Mersey View,.
Liverpool in the County of Lancashire Brassfounder do hereby declare the nature of
our said invention to be as follows:-
An improvement in Steam Blowers for use on Marine and other Boilers furnaces
and the like and consists of a steam jet fed with highly heated dry air, which blows
the fire underneath the grate bars, the ash pit being closed.
To carry out this invention, having first hermetically closed the ash pit, we provide
a steam jet apparatus of any well known design, which we provide with a supply of
highly heated air by means of supply pipes or trunks leading through highly heated
parts of the boiler or furnace.
The noise which has heretofore been so objectionable in the use of this class of
Blowing apparatus is effectually done away with by our improvement system. The
noise of the steam jet is shut out by closing the front of the ash pit and the noise of
the air rushing into the end of trunk is removed out of hearing by extending the
latter and carrying it to any convenient distance away.
In steam jets as hitherto employed, the steam has been condensed to a great extent
by meeting the cold air of the surrounding atmosphere, and of course under these
conditions a proportionate, amount of its force is wasted or lost. The air we use is
heated to such a degree that it has no condensing effect on the steam and consequently
we produce a blast of far greater strength than has, to our knowledge been done
before.
The hot blast conveyed by the trunks becomes mixed in the ash pit with a sufficient
quantity of aqueous vapours to combine properly with the fuel during combustion.
WALTER A. BARLOW,
6, St. Paul's Churchyard, London, E.C.;
Applicants Agent.
1.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Blast Apparatus.
EDWARD LORIMER MARDSEN of Bridge Street, Birkenhead, in the county of Chester,
Brassfounder, and PHILIP HENRY SHENSTONE NICKLIN, of No. 33 Lower Mersey
View, Liverpool, in the county of Lancashire, Brassfounder 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 improvements in Steam Blowers for use on Marine and
other Boiler furnaces and the like, and consists of a steam jet fed with highly heated "
dry air, which blows the fire underneath the grate bars, the ash pit being closed.
To carry out our.invention, having first hermetically closed the ash pit, we provide
a steam jet apparatus of any well known design, which we provide with a supply of
highly heated air by means of supply pipes or trunks leading through highly heated
parts of the boiler or furnace.
The noise which has heretofore been so objectionable in the use of this class of
Blowing apparatus is effectually done away with by this invention. The noise of the
steam jet is shut out by closing the front of the ash pit, and the noise of the air
rushing into the end of the supply pipe or trunk is removed out of hearing by
, extending the same and carrying it to any convenient distance away.
In steam jets as hitherto employed the steam has been condensed to a great extent
by meeting the cold air of the surrounding atmosphere, and of course under these
conditions a proportionate amount of its force is wasted or lost. The air we use is
heated to such a degree that it has no condensing effect on the steam and consequently
we produce a blast of far greater strength than has, to our knowledge been done
before.
The hot blast conveyed by the trunks becomes mixed in the ash pit with a sufficient
quantity of aqueous vapours to combine properly with the fuel during combustion.
In the drawings hereunto annexed, Figs. 1 and 2, Sheet 1. are respectively a
longitudinal Section and an end elevation of an ordinary Lancashire Boiler fitted with
our invention.
.
Fig. 3, Sheet 2. is a longitudinal section of a marine Boiler similarly fitted, and
Fig. 4 Sheet 2. shows upon enlarged scale the steam jet nozzle, steam pipe and part
of air supply pipe. Similar letters refer to similar parts throughout the drawings.
In carrying out our invention we proceed as follows. We first hermetically close
the front of the ash pit a, by means of a close fitting plate, & and through this we
carry the steam jet pipes, c. These steam jet pipes are branches from the main blast.
pipe, d, which supplies the apparatus with steam from the boiler.
The pipes
terminate in small nozzles, e (more clearly shown in Fig. 4-Sheet 2) and are fitted
with suitable cocks as shown in figs. 1 and 2, by means of which the supply of steam
to each of them may be regulated. A man-hole, f, is made in the plate a, through
which access may be had when required to the ash pit for removing ashes and for
other purposes.

page_text: The air for the blast is brought through supply pipes, which lead from outside
the Boiler house, through the combustion chamber, h, and flue, i, to the ash pit, a
where the ends of said supply pipes are turned over and tapered to form the
nozzles, j. The steam nozzles e, are introduced in line with the axis of the pipes, j. as
shown in Figs. 1 and 4.
In the case of a marine Boiler we often find it desirable to lead the air supply
pipes. g. through the smoke box and up alongside the smoke stack or funnel, to a
sufficient height to render the noise of the air rushing into them inaudible. In these
cases we collect the various air supply pipes together and lead them in one main air
supply pipe to the height or distance required. In cases where it is not necessary to
do this, we terminate the air supply pipe. g. in the stoke hole as shown by dotted lines
in Fig. 3. sheci 2.
It must be borne in mind that in all cases the air supply pipes, g. must be of such
length, in their passage through the heated parts of the boiler and furnace, that the
air passing through them becomes heated to a temperature equal to, or in excess of
that of the steam which meets it at the point of delivery.
Where there is not length for a straight pipe to give the necessary surface for this
purpose, a coil or bent pipe, or an equivalent arrangement may be used instead of the
straight pipes shown in the drawings.
The operation of our invention is as follows.-On steam being admitted to the
pipes,
it rushes through the nozzles, e, and encountering the heated air in the air
nozzle, j. it expands forcibly, and like a continual piston, draws air with it into the
closed ash pit, «. The consequent pressure there escapes through the fire bars and
supplies the fire with a most effective and abundant hot blast.
1 will easily be seen there can be no objectionable noise attending the use of our
invention, since closing the ash pit a, by the plate, b, shuts out the noise of the escaping
steam, and the inlet ends of the air trunks, g, are removed to such a distance that the
noise of the air entering them cannot be heard.
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 :-
Firstly. The combination in a steam blast apparatus of the hot air supply pipe, :
steam nozzle, e air nozzle, with the closed chamber or ash pit, a, substantially as
and for the purpose herein set forth and shown by the drawings..
Secondly. In a steam blast apparatus, heating the air supply by the pipe, g, or its
equivalent, to a temperature exceeding that of the steam jet, as and for the purpose
Herein set forth.
WALTER A. BARLOW,
6. St. Paul's Churchyard, E.C.,
Agent for the Applicants.