Improvements in Water Tube Steam Generators
Year: 1897

page_text: Date of Application, 20th Feb., 1897
Complete Specification Left. 26th Nov. 1897-Accepted. 1st Jan. 1898
Date of Application, 40th rev., 1097
Complete Specification Left. 26th Nov.. 1897-Accepted. 1st Jan. 1898
PROVISIONAL SPECIFICATION.
"Improvements in Water Tube Steam Generators."
I, LOUIS DE NAEYER, of Willebroek, in the kingdom of Belgium, Engineer
and Manufacturer, do hereby declare the nature of this invention to be as
follows:
This invention relates to water tube steam generators and consists of an
improved construction thereof with the object of obtaining greater simplicity with
increased evaporation and efficiency. My improved generator is composed of
two practically independent tubulous groups, and one upper steam-and-water
drum. One of these tubulous groups is placed immediately over the fire grate
and is composed of two or more superposed rows of parallel tubes slightly
inclined to the horizontal and fixed at their ends into similar transverse junction
boxes or collectors made of cast or wrought iron or steel These have closed
ends fitted with mud-holes and the whole is suitably supported by or suspended
by rods from the furnace frame. The two transverse collectors communicate
at each end by bends, pipes and branches with the upper steam-drum the front
one about water level, and the rear one to the base of the drum, which is suitably
protected from the direct impact of flames. The other part consists of a
similar group of tubes of any desired number placed above the first group, and
it is composed of a superposed series of tubulous elements; each element is made
up preferably of two superposed water tubes fixed at their ends into sectional
junction boxes each having three openings in their inner faces, two of which
serve to receive the ends of the two water tubes, and the third serves to receive
a short connecting tube or suitable coupler for joining it to the next lower box
upon which it rests. These end boxes are arranged and connected one above
the next in step-like form, and the tube ends therefore may come in vertical or
sinuous or
staggered" lines; an access hole and cover is provided opposite to
the end of each tube, and the whole is secured by flanges or lugs with bolts and
nuts, or by clamps or otherwise suitably. This upper tube group is supported
therefore by the transverse collectors of the lower tube group and the uppermost
end box has an additional hole at its upper end by which it is connected to a
transverse collector similar to those above described which is connected to the
base of the steam-drum. A practically independent system of tubes and collectors
placed immediately over the fire as first above described is of itself an efficient
generator of steam, and experience has shown that the quantity of steam produced
by the said two first rows of a tube group placed immediately over the fire
generate at least half of the total quantity of steam produced by the whole of
even a well-arranged connected tube group; and further by joining, as above
explained, these two lowest rows of tubes directly and independently to the
steam drum, I am able to directly discharge thereinto about half of the total
steam product of the whole tube group: the upper tube-group secondly described
serves to utilize and absorb heat which has excaped from the said lower group.
The rear tube-end boxes of the upper tube-group are similarly arranged, the
«

page_text: lowest one having a fourth opening by which it is connected to the lower
transverse rear collector of the first tube group, so that circulation of water
through the whole system is assured.
Dated this 26th day of February. 1897.
"
Improvements in Water Tube Steam Generators."
1, LOUIS DE NAEYER, of Willebroeck, in the Kingdom of Belgium, Engineer
and Manufacturer, do hereby declare the nature of this invention, and in what
imanner the same is to be performed, to be particularly described and ascertained
in and by the following statement':
This invention relates to water tube steam generators and consists of an
improved construction thereof with the object of obtaining greater simplicity
with increased evaporation and efficiency. My improved generator consists of
separate elements assembled in any desired number, each element being made ap
preferably of two superposed water tubes fixed at their ends into sectional junction
boxes each having three openings in their inner faces two of which serve to
receive the ends of the two water tubes and the third serves to receive a short
connecting tube or suitable coupler for joining it to the next lower box upon
which it rests. These end boxes are arranged and connected one above the next
in step-like form, and the tube ends therefore may come in vertical or sinuous
staggered" lines; an access hole and cover is provided opposite to the end
of each tube, and the whole is secured by flanges or lugs with bolts and nuts, or
by clamps or otherwise suitable. The uppermost end box has an additional hole
at its upper end by which it is connected to a transverse collector which is con-
nected to the base of the steam-drum.
or
$6
The rear tube-end boxes of the tube-groups are similarly arranged, the lowest
one having a fourth opening by which it is connected to the lower transverse
rear collector of the first tube-group, so that circulation of water through the
whole system is assured.
I will now fully explain my invention in reference to the accompanying
drawings in which Fig. 1 is a front end elevation, Fig. 2 a side clevation partly
in section and Fig. 3 a rear end elevation of a steam generator without the
furnace, and having the usual accessories illustrating my invention. Fig. 4 is
an enlarged part front elevation of sinuously arranged tube boxes and covers.
Fig. 5 is a sectional elevation of same. Fig. 6 is an elevation showing a vertical
arrangement of tube end boxes. My improved generator is composed of two
tubulous groups T and To, and one upper steam-and-water drum A. The lower
one T of these tubulous groups is placed immediately over the fire grate and is
composed of two or more superposed rows of parallel tubes T T slightly inclined
to the 'horizontal and fixed at their ends into similar transverse junction boxes
or collectors C C which are preferably square in cross-section and made of .cast
or wrought iron or steel. These have closed ends which are fitted with mud-
holes in the usual way. The front transverse collector C communicates at each
of its ends by bends H and H¹, pipes F F and branches G G¹ with the upper
steam-collector A at or about water level therein, and the rear transverse
collector C¹ communicates by bends E E¹ pipes B B₁ and branches I) D¹ with
the base of the same collector A at D². The said steam collector A is suitably
protected from the direct impact of flames, by refractory baffle plates as usual.
The other or upper tubulous part To consists of a similar group of tubes of any

page_text: desired number placed above the first group T, and it is composed of a super-
posed series of tubulous elements. Four are shown in the drawing and since
each element is the same, I will describe one of them, it is made up preferably
of two superposed inclined water tubes T3 T4 fixed at their ends into sectional
junction boxes K' K5 each having three openings t t in their inner faces, two
of which t¹t serve to receive the ends of the said two water tubes T3 T4 and the
third serves to receive a short connecting tube M Fig. 5 or suitable coupler
for joining it to the next lower similar box or connector upon which it rests.
These end boxes K' K2 K3 K4 are preferably arranged and connected at each end
of the tubes one above the next in step-like form as illustrated, and the tube
ends therefore may come in sinuous lines as in Figs. 1, 3, 4 or in vertical lines
as in Fig. 6 according to the design of the boxes; an access hole and cover N
is provided opposite to the end of each water tube, and the whole is secured and
held together by flanges or lugs f f with bolts f¹ and nuts f², or by clamps
or otherwise suitably. This upper tube T is supported therefore by the trans-
verse collectors C C of the lower tube group T and the uppermost end box K
at the front has an additional hole at in its upper inner end by which it is
connected to a transverse collector L similar to C C above described and which
is independently connected to the base of the steam-drum A by the pipe connec-
tion L. The rear tube-end boxes K K K K of the upper tube-group are
arranged in step-like form similarly to the front ones, and the lowest one K5 is
provided with a fourth opening to at the lower part of its inner face by which it is
connected to the back of the lower transverse rear collector C¹ of the first tube
group T, so as to afford free circulation of water through the whole system.
Though I have particularly described one way of forming, arranging and con-
necting the tube end junction boxes of the upper tube group To I do not confine
myself to that above described, since the said boxes may be otherwise formed and
arranged so long as the system of boxes is in free and open communication with
one another and with the steam receiver. This combination will admit of forming
a whole section of the tubulous elements following either sinuous or vertical
lines as shown and described.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is:.
1. In a water tube boiler the arrangement and use of an assemblage of similar
and separate elements each made up of superposed tubes fixed at their ends into
sectional junction-boxes such as above described in which certain holes are
arranged opposite each other in both front and rear faces to receive respectively
the tubes and the couplers by which the boxes are connected one to another as
set forth, the arrangement being such that the said superposed boxes take a step-
like form at each end of the boiler and the tube ends come in sinuous or straight
vertical lines and the whole system of boxes and tubes are in free communication
with one another and with a steam drum, substantially as and for the purpose
described.
2. A water tube boiler composed of an assemblage of elements constructed as
above specified in combination with transverse collectors and a steam drum and
connections all arranged substantially as described with reference to the several
forms illustrated in the accompanying drawings and for the purposes set forth.
Doted the Ifth day of November 1897
J. C. CHAPMAN.
Agent for the Applicant. 70 Chancery Lane, London, W.C.