Improvements in Water-tube Steam Boilers.
Year: 1898

page_text: Date of Application, 27th Dec., 1898
Complete Specification Left, 3/81 Jan, 189)-Accepted, 4th Mar., 1899
Improvements in Water-tube Steam Boilers.
I, WILLIAM PHILLIPS THOMPSON, F.CS, VIME, of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil Engineer,
do hereby declare the nature of this invention to be as follows -
This invention relates to water tube boilers and is an improvement on my
former inventions, in which means are provided for directing the gaseous products
of combustion transversely to the courses of the water circulating system and
into active contact therewith This improvement has for its object, primarily,
the utilization of the principles of my former inventions, in a boiler having such
construction that material head 100m 18 saved, the structure is strengthened, the
various members of the system are rendered readily accessible and removable,
free circulation is facilitated, and a large heating surface for the generation of
steam is provided within a relatively small space
My invention is illustrated in the accompanying drawings, of which
Fig. 1 is a front elevation, partially in section; Fig 2 is a vertical sectional
view, on the line aa of Fig 1; Fig 3 is a modification of the construction
illustrated in Fig. 2
As in ny former invention, forming the subject matter of my application,
Number 18,140, of August 23, 1898, the space enclosed by the containing walls 1
is separated into two distinct compartments by a division wall 2 Each of these
compartments is provided with a baffle wall 3, extending upward and forming
with the division wall 2, a primary pass or combustion chamber 4, containing a
grate 5, and with a baffle wall 6, extending downward and forming, with the
baffle 3 and the end wall 1 respectively, the secondary passes 7 and 8
ducts 9 and 10 supply an to facilitate combustion. The division and baffle walls
are preferably formed of a combination of refractory material with water
boxes 21, 31 and 61, the latter being placed in the lower parts of the passes, where
they can be removed readily
The
The water boxes 21, 3 and 61 and the banks of tubes 11, 12 and 13, in the
respective passes 4, 7 and 8, are connected with front and rear headers or water
legs 14 and 15, which may be of the box type. as shown in the pass 4, or of the
sectional type, as shown in the passes 7 and 8
In the form of the invention illustrated in Fig. 2, a steam and water drum 16
is placed above the front headers 14 and is connected therewith by the nipples 17
The front headers for the primary passes 4 are connected with a water box 18
by nipples 19, and the front headers for the secondary passes 7 and 8 are connected
with the water box 20 by the nipples 21 An opening 22, between the walls 2

page_text: and 3, and the water boxes 18 and 20, is thus provided through which fuel 18
charged to the grate 5 in each primary pass The tubes and the water boxes,
extending between and connected with the front and rear headers, 11se from
the front toward the real headers The bottoms of the real headers are con-
nected with a water box 23 by the nipples 24, and the tops of 'the rear headers
are connected with a water box 25 by the nipples 26 The water box 25 18
connected with the drum 16 by the tubes 27, covered by a roof of insulating
material 28 The breeching or escape 29 extends forward over the drum
In the form of the invention illustrated in Fig 3, the steam and water drum 16
is placed over and connected by the nipples 17 with the ear headers 15 and their
water box and connecting nipples 23 and 24 The front headers for the primary
passes 4 are connected with the water box 18 by the nipples 19, and the front
headers for the secondary passes 7 and 8 are connected with the water box 20 by
the nipples 21, as in Fig 2 The tubes and the water boxes, extending between
and connected with the front and rear headers, fall from the front toward the
rear headers, and the water box 25 and its nipples 26 are placed above and con-
nected with the front headers 14 The tubes 27 thus connect the front header
with the drum, and the escape above the roof baffle 28 extends rearwardly to the
breeching above the drum
The boiler is provided with the doors 30, 31 and 32, for access to the interior
construction, and with the usual fire doors 33 and ash doors 34 Passages, as 35,
may be formed in the containing walls for access to the various parts requiring
inspection and repair
In constructing the boiler the headers, which are shown in vertical positions,
may be inclined, when this is deemed expedient
It will be observed that the position of the drum above the headers for the
lower ends of the tubes results in a material saving of head room and that this
arrangement, with the employment of the horizontal water boxes which connect
the corresponding headers for the several passes, materially stiffens the water
circulating and steam generating system, renders it more compact, more readily
assembled and dismembered, and facilitates freedom of circulation When the
capacity required is small, the same general arrangement may be embodied in a
construction employing a single primary pass or combustion chamber and the
corresponding secondary passes, omitting one-half of the double construction
shown and described
In operation, the gaseons products of combustion pass from the primary com-
bustion chambers 4 through the apertures between the bridge walls or baffles 3
and the 1oof baffle 28, thence downward through the passes 7 and beneath the
baffle walls 6, thence upward through the passes 8 and above the 1oof baffle 28
to the breeching 29 In the water circulating and steam generating system, the
course is downward, from the drum, through the headers and water boxes con-
nected beneath the same, thence upward through the water tubes and boxes
connecting the two headers, and from the second header and its water box back
to the drum through the tubes 27
Dated the 27th day of December 1808

page_text: Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil 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 water tube boilers and is an improvement on my
former inventions, in which means are provided for directing the gaseous products
of combustion transversely to the courses of the water choulating system and
into active contact therewith This improvement has for its object, primarily,
the utilization of the principles of my former inventions in a boiler having such
construction that material head room is saved, the structure is strengthened, the
various members of the system are rendered readily accessible and removable,
free circulation is facilitated, and a large heating surface for the generation of
steam is provided within a relatively small space
My invention is illustrated in the drawings, filed with my Piovisional Speci-
fication of which;
Fig. 1 is a front elevation, partially in section; Fig 2 is a vertical sectional
view, on the line a-a of Fig 1, Fig 3 is a modification of the construction
illustrated in Fig 2
As in my former invention, forming the subject matter of my British appli-
cation, Number 18140 of 1898, the space enclosed by the containing walls 1
is separated into two distinct compartments by a division wall 2 Each of these
compartments is provided with a baffle wall 3 extending upward and forming
with the division wall 2, a primary pass or combustion chamber 4, containing a
grate 5, and with a baffle wall 6, extending downward and forming, with the
baffle and the end wall 1 respectively, the secondary passes 7 and 8. The
ducts 9 and 10 supply air to facilitate combustion. The division and baffle walls
are preferably formed of a combination of refractory material with water
boxes 21, 3 and 61, the latter being placed in the lower parts of the passes, where
they can be removed readily.
The water boxes 21, 3 and 61 and the banks of tubes 11, 12 and 13, in the
respective passes 4, 7 and 8, are connected with front and rear headers or water
legs 14 and 15, which may be of the box type, as shown in the pass 4, or of the
sectional type, as shown in the passes 7 and 8
In the form of the invention illustrated in Fig 2, a steam and water drum 16
is placed above the front headers 14 and is connected therewith by the nipples 17
The front headers for the primary passes 4 are connected with a water box 18
by nipples 19, and the front headers for the secondav passes 7 and 8 are connected
with the water box 20 by the nipples 21 An opening 22, between the walls 2
and 3, and the water boxes 18 and 20, is thus provided through which fuel is
charged to the grate 5 in each primary pass The tubes and the water boxes,
extending between and connected with the front and rear headers, rise from
the front toward the rear headers The bottoms of the rear headers are con
nected with a water box 23 by the nipples 24, and the tops of the rear headers
are connected with a water box 25 by the nipples 26 The water box 25' in
connected with the drum 16 by the tubes 27, covered by a roof of insulating
material 28. The breeching or escape 29 extends forward over the drum
In the form of the invention illustrated in Fig 3, the steam and water drum 16
is placed over and connected by the nipples 17 with the rear headers 15 and then
water box and connecting nipples 23 and 24. The front headers for the primary
passes 4 are connected with the water box 18 by the nipples 19, and the front
headers for the secondary passes 7 and 8 are connected with the water box 20 by
the nipples 21, as in Fig. 2 The tubes and the water boxes, extending between
and connected with the front and rear headers, fall from the front toward the
rear headers, and the water box 25 and its nipples 26 are placed above and con-
nected with the front headers 14 The tubes 27 thus connect the front header
with the drum, and the escape above the roof baffle 28 extends rearwardly to the

page_text: breeching above the drum The boiler is provided with the doors 30, 31 and 32,
for access to the interior construction, and with the usual fire doors 33 and ash
doors 34 Passages, as 35, may be formed in the containing walls for access to
the various parts requiring inspection and repair
In constructing the boiler the headers, which are shown in vertical positions
may be inclined, when this is deemed expedient
It will be observed that the position of the drum above the headers for the
lower ends of the tubes results in a material saving of head room, and that this
arrangement, with the employment of the horizontal water boxes, which connect
the corresponding headers for the several passes, materially stiffens the water
circulating and steam generating system, renders it more compact, more readily
assembled and dismembered, and facilitates freedom of circulation When the
capacity required 18 small, the same general arrangement may be embodied in a
construction emploving a single primary pass or combustion chamber and the
corresponding secondary passes, omitting one-half of the double construction
shown and described
In operation, the gaseous products of combustion pass from the primary com-
bustion chambers 4 through the apertures between the bridge walls or baffles 3
and the roof baffle 28, thence downward through the passes 7 and beneath the
baffle walls 6, thence upward through the passes 8 and above the roof baffle 28
to the breeching 29 In the water circulating and steam generating system the
course is downward, from the drum, through the headers and water boxes con-
nected beneath the same, thence upward through the water tubes and boxes
connecting the two headers, and from the second headers and their water box back
to the drum through the tubes 27
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is
-
1 In the combination of a boiler and furnace, a primary pass, a secondary pass
and an escape therefiom, a baffle wall between said passes, a bank of inclined
tubes in each of said passes, having their vertical planes substantially parallel
with said baffle wall, headers for the respective ends of said tubes, a drum above
the headers for the lower ends of said tubes and connected therewith, and passages
connecting the headers for the upper ends of said tubes with said drum, sub-
stantially as specified
2 In the combination of a boiler and furnace, one or more banks of inclined
tubes, headers for the respective ends of said tubes, a steam drum above the headers
for the lower ends of said tubes and connected therewith, a water box above the
headers for the upper ends of said tubes and connected therewith, and tubes
connecting said water box with said drum, substantially as specified
3. In the combination of a boiler and furnace, one or more banks of inclined
tubes, headers for the respective ends of said tubes, a steam dium above the
headers for the lower ends of said tubes and connected therewith, a water box
below the headers for the lower ends of said tubes and connected therewith, a water
box above the headers for the upper ends of said tubes and connected therewith,
and tubes connecting the last named water box with said drum, substantially as
specified
4. In the combination of a boiler and furnace, one or more banks of inclined
tubes, headers for the respective ends of said tubes, a steam drum above the
headers for the lower ends of said tubes and connected therewith, a water box
below the headers for the lower ends of said tubes and connected therewith, a
water box above the headers for the upper ends of said tubes and connected there-
with, tubes connecting the last named water box with said drum, and one or more
water boxes beneath the lower ends of the headers for the upper ends of said tubes
and connected therewith, substantially as specified
5. In the combination of a boiler and furnace, a primary pass, a secondary pass

page_text: and an escape therefrom, a baffle wall between said passes, a bank of inclined tubes
in each of said passes, having their vertical planes substantially parallel with
said baffle wall, headers for the respective ends of said tubes, a drum above the
headers for the lower ends of said tubes and connected therewith, a water box
above the headers for the upper ends of said tubes and connected therewith, and
tubes connecting said water box with said drum, substantially as specified
6 In the combination of a boiler and furnace, a primary pass, a secondary pass
and an escape therefrom, a baffle wall between said passes, a bank of inclined
tubes in each of said passes, having their vertical planes substantially parallel
with said baffle wall, headers for the respective ends of said tubes, a drum above
the headers for the lower ends of said tubes and connected therewith, a water box
below the headers for the lower ends of said tubes and connected therewith, a
water box above the headers for the upper ends of said tubes and connected there-
with, and tubes connecting the last named water box with said drum.
7 In the combination of a boiler and furnace, a pair of primary passes separated
by a division wall, a secondary pass and an escape therefrom communicating with
each of said piimary passes, baffle walls separating the respective primary and
secondary passes, a bank of inclined tubes in each of said passes, headers for the
respective ends of said tubes, a drum above the headers for the lower ends of said
tubes and connected therewith, passages connecting the headers for the upper
ends of said tubes with said drum and a 100f baffle for said passages, substantially
as specified.
8. In the combination of a boiler and furnace, a pan of primary passes, a
division wall composed of a lower section of tubes o water boxes and an upper
section of refractory material for separating said primary passes, secondary passes
and escapes therefrom communicating with the respective primary passes, baffle
walls composed of lower sections of tubes or water boxes and upper sections of
refi actory material separating the respective primary and secondary passes, banks
of inclined tubes in said passes, headers for the respective ends of said tubes, a
drum above the headers for the lower ends of said tubes and connected therewith,
a water box above the headers for the upper ends of said tubes and connected
therewith, tubes connecting the last named water box with said drum, and a roof
baffle for said tubes, substantially as specified
Dated the 51st day of January 1899
W P. THOMPSON & Co,
322, High Holborn, London, WC, Patent Agents for the Applicant,
Of London, Liverpool, Manchester and Birmingham