Improvements in Steam Generators.
Year: 1894

page_text: Date of Application, 27th Mar., 1894-Accepted, 2nd June, 1894
COMPLETE SPECIFICATION.
Improvements in Steam Generators.
I, AUGUSTE HUET, of 21 Boulevard Poissonnière Paris in the Republic of
France, 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 steam generators which have series of inclined water
containing tubes connected by plugged unions so that the series of tubes form
what may be termed a flattened coil starting from a lower chamber and terminating
in an upper chamber.
A number of these tubes so arranged and placed in juxtaposition may be
connected by such chambers at top and bottom. A very compact and conveniently
arranged steam generator may be constructed by causing a flattened coil or
flattened coils formed by the series of tubes starting from a lower chamber (for
example on the right) to cross or intercoil with another flattened coil or other
flattened coils formed by the series of tubes starting from a second lower chamber
situated for example on the left and each terminating in opposite chambers above.
The inclination of each series of tubes is such as to allow of the interposition of
the tubes which cross it. Having thus described the nature of my invention I
will now refer to the accompanying drawing in order that my invention and the
manner in which it can be performed may be more fully understood.
Figure 1 shews separately in front and end elevation a series of tubes A A' A'
forming a flattened coil arranged between a lower chamber C and an upper
chamber D.
Figure 2 is a longitudinal vertical section of a multitubular generator comprising
series of tubes connected as hereinbefore described. In this figure one half A of
the sets of tubes start from a lower chamber Ca and the other half B of the sets
of tubes start from a lower chamber C 6 the sets of tubes intersecting or intercoiling
with each other as shewn.
Figure 3 is a transverse section of the generator shewing on the right hand side
the tubes A separately and on the left hand side the tubes A crossing with the
tubes B.
Figure 4 is a longitudinal section of a generator formed by two groups of twelve
tubes each.
Figures 5 and 6 shew a modification of the chambers for the reception of the
ends of the tubes.
The series of tubes shewn in Figure 1 are formed of three lengths of tubes A A'A'
connected by plugged connections a a¹. The number of the lengths of tubes may
be varied for instance two may be employed as in Figure 4 or there may be more
than three. In any case the lower lengths of the tubes open into the lower
chamber C and the upper lengths of the tubes open into the upper chamber D so
that a coil of tubes is formed the inclination of which may be of any degree
desired the coils being single double triple or in any desired number depending
on the number of groups of tubes which are employed to cross each other. Several
of such sets of coils may be arranged in juxtaposition as shown on the right side
of Figure 3 or by giving the coils a suitable inclination several sets may cross
each other as shewn in Figure 2 and on the left side in Figure 3.
In Figures 2 and 3 the generator contains two coils or sets of coils of tubes
the one coil (or coils) A A A³ starting from the lower chamber C a and the other
coil (or coils) B B' B³ starting from the lower chamber Cb each terminating in

page_text: the upper chambers Da and Db respectively on the left and right in this arrangement
the tubes crossing like the double threads of a screw.
The chambers may be arranged along the whole width of the generator as in
Figures 2 and 3 and it is preferable to arrange them in the form of a narrow water
space or they may be composed of separate compartments receiving the ends of
the tubes as shown in Figures 5 and 6 they being connected together at the bottom
by a water chamber E and at the top by a steam chamber F.
The lower chamber E and the upper chamber F are connected together by
columns G. The continuous chambers C and D are similarly connected.
The lower chambers are connected by communication pipes H and the upper
chambers are connected by the pipes I. The upper chambers are connected to a
steam drum or drums J.
The chambers may be provided with inspection doors placed opposite to the
ends of the tubes.
The groups of the series of tubes will be enclosed in a metal casing, preferably
lined with brickwork or non-conducting materials, removable doors being arranged
opposite the junctions of the tubes.
In the said casing baffles L are preferably arranged above the tubes so as to
cause the gaseous products of combustion to spread over the whole generator.
A furnace M of any desired construction is situated beneath the arrangement of
tubes.
The boiler hereinbefore described may be constructed of any desired shape and
dimensions and of any suitable material.
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. In tubular steam generators the combination of tubes superposed so as to
constitute a flattened coil or flattened coils having an inclination in accordance
with the number of flattened coils employed and being connected with a lower
chamber and an upper chamber or with lower and upper chambers substantially
as herein before described with reference to the accompanying drawings.
2. In tubular steam generators the combination of tubes superposed so as to
constitute flattened coils with an inclination in accordance with the number of
flattened coils employed and connected to lower and upper water chambers the
tubes of the several coils crossing or intercoiling in any desired number so as to
increase the heating surface while diminishing the total bulk of the generator
substantially as hereinbefore described with reference to the accompanying
drawings.
3. A steam generator consisting of the combination of flattened coils of tubes
and of upper and lower water chambers as claimed by the preceding claiming
clauses, the upper chambers and the lower chambers being arranged at each side
and being either interrupted or continuous and being provided with means of
communication with the several chambers and having above the tubes a baffling
device for causing the gaseous products of combustion to be spread throughout
the generator substantially as hereinbefore described with reference to the accom-
panying drawings.
Dated this 27th day of March 1894.