Improvements in Steam Generators.
Year: 1896

page_text: Date of Application, 12th Nov., 1896-4ccepted, 19th Dec., 1996
Improvements in Steam Generators.
I, JAMES HERMANN ROSENTHAL, of 147 Queen Victoria Street, in the City of
London, Engineer, do hereby declare the nature of this invention and in what
manner the saine is to be performed, to be particularly described and ascertained
in and by the following statement:--
This invention has for its object to provide a steam generator of the water-tube
type of improved construction especially for marine purposes, and with which is
combined a steam superheater adapted to serve cither as such or as part of the
heating surface of the boiler.
The improved steam generator is shown in the accompanying drawings in which
Figure 1 is a longitudinal section and Figure 2 a cross sectional elevation of one-
modification and Figure 3 is a part elevation showing a modified arrangement.
The generator is composed of inclined water circulating tubes A extending over
a furnace B and connected at each end to headers C, C, the headers C being
connected by tubes D to a steam and water drum or collector E whilst the
headers C are closed at top with the exception of those at the sides and in some
cases one or more at the centre of the boiler, which are connected by short.
tubes D' to the collecting drum E. cross tube F or mud drum is connected by
nipples to each series of end headers and these tubes F are connected together by
inclined tubes A' under the main water circulating tubes A. Circulation of the
water as between the lower tubes or drums F and main steam and water drum E
is effected by means of side tubes G connecting them together. The steam
generated in the boiler and collected in the drum E passes off through a super-
heater composed of a number of bent or doubled tubes H placed in the upper end
of the combustion chamber I over the circulating tubes A, the ends of these
tubes H being expanded into upper and lower cross tubes or manifolds J resting on
the headers C. These cross tubes J may extend across the boiler to fill the space-
between the tubes D¹ as shown at Figure 3, or they may be made shorter and
doubled in number to occupy the spaces between the central and end tubes D¹ as.
shown by Figure 2.
The upper cross tube or tubes J is or are connected by a pipe or pipes K to a
perforated drum L placed well up in the drum E so that only dry steam may be
drawn off, and the steam passing thereinto flows through the superheater tubes H
and cross tubes J towards the steam supply pipe M provided with the usual stop-
valve N.
For the purpose of flooding the superheater, so that the tubes H of which it is.
mainly composed may not be overheated before steam has been raised to fill them,.
a pipe connection O is made between the lower side of the drum E and the super-
heated steam supply pipe M. This pipe O is fitted with a three-way valve or
cock P. The cock P may be turned to admit water from the drum E to the
pipe M and thence through the superheater tubes H any steam raised in which
will then pass up into the drum E; or it may be turned to place the pipe M in
communication with a blow off or drain pipe Q in which case the steam in the
Irum E will pass into the superheater tubes H and blow off the water in them and
hese pipes will then serve only for superheating the steam.
A separate stop cock R is fitted on the main drum E for drawing off steam.
herefrom when the superheater is flooded with water.

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. A steam generator the several parts of which are constructed arranged and
combined substantially as described.
2. The combination with a water tube steam generator of a superheater composed
of bent or doubled tubes placed in the combustion chamber of the generator and
connected to cross tubes resting on the headers and having separate pipe connections
to a steam collector in the boiler steam space and to the water space of the drum
so that the superheater may be flooded when desired substantially as described.
Dated this 11th day of November 1896.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather, Chartered Patent Agents,
62 St. Vincent Street, Glasgow, Agent for the Applicant.